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US20080113948A1 - Use of 2,5-Dihydroxybenzene Compounds and Derivatives for the Treatment of Psoriasis - Google Patents

Use of 2,5-Dihydroxybenzene Compounds and Derivatives for the Treatment of Psoriasis Download PDF

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US20080113948A1
US20080113948A1 US11/839,520 US83952007A US2008113948A1 US 20080113948 A1 US20080113948 A1 US 20080113948A1 US 83952007 A US83952007 A US 83952007A US 2008113948 A1 US2008113948 A1 US 2008113948A1
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acid
compound
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Pedro Cuevas Sanchez
Guillermo Gimenez Gallego
Inigo Saenz de Tejada Morgan
Javier Angulo Frutos
Serafin Valverde Lopez
Antonio Romero Garrido
Rosa Maria Lozano Puerto
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Action Medicines SL
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Action Medicines SL
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Assigned to ACTION MEDICINES, S.L. reassignment ACTION MEDICINES, S.L. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: GALLEGO, GUILLERMO GIMENEZ, GARRIDO, ANTONIO ROMERO, GORMAN, INIGO SAENZ DE TEJADA, LOPEZ, SERAFIN VALVERDE, PUERTO, ROSA MARIA LOZANO, SANCHEZ, PEDRO CUEVAS, FRUTOS, JAVIER ANGULO
Publication of US20080113948A1 publication Critical patent/US20080113948A1/en
Priority to US13/166,569 priority Critical patent/US8530454B2/en
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    • C07C309/41—Sulfonic acids having sulfo groups bound to carbon atoms of six-membered aromatic rings of a carbon skeleton containing singly-bound oxygen atoms bound to the carbon skeleton
    • C07C309/42—Sulfonic acids having sulfo groups bound to carbon atoms of six-membered aromatic rings of a carbon skeleton containing singly-bound oxygen atoms bound to the carbon skeleton having the sulfo groups bound to carbon atoms of non-condensed six-membered aromatic rings
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    • C07C65/03—Compounds having carboxyl groups bound to carbon atoms of six—membered aromatic rings and containing any of the groups OH, O—metal, —CHO, keto, ether, groups, groups, or groups containing hydroxy or O-metal groups monocyclic and having all hydroxy or O-metal groups bound to the ring
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Definitions

  • the invention relates to the use of 2,5-dihydroxybenzene derivatives, their pharmaceutically acceptable salts and solvates, as well as isomers and prodrugs thereof for the treatment of psoriasis.
  • Rosacea is a frequent ocular and facial disease usually affecting millions of people worldwide. It is a chronic and progressive vascular skin disorder, involving mainly the malar and nasal areas of the face. Rosacea is characterized by erythema, papules, pustules, telangiectasia, facial edema, ocular lesions and in its most advanced and severe form, tissue and sebaceous gland hyperplasia leading to rhinophyma. Rhinophyma, a florid overgrowth of the tip of the nose with hypervascularity and nodularity, is an uncommon progression of rosacea with an unknown cause. Ocular lesions, including mild conjunctivitis, burning and gritty sensation, are common. Blepharitis, the most common ocular manifestation, is a non-ulcerative condition of the eyelid margins.
  • Psoriasis is a chronic disease affecting approximately 2-3% of the world population. It is characterized by epidermal cell hyperproliferation. Psoriasis symptoms include clearly defined erythematous spots covered by a characteristic crust, epidermal hyperproliferation, peeling and incomplete keratinocyte differentiation. Clinical psoriasis variants include erythrodermic, seborrheic, reverse and photosensitive psoriasis and psoriasis guttata, pustular variants and Reiter's disease. There is currently no cure for psoriasis.
  • the inventors have surprisingly found that 2,5-dihydroxybenzene derivatives, their pharmaceutically acceptable salts and solvates, as well as isomers and prodrugs thereof are useful in preparing medicinal products for treating psoriasis.
  • the invention provides a method for the treatment and/or prophylaxis of psoriasis, comprising administering to a subject in need thereof, an effective amount of a 2,5-dihydroxybenzene derivative represented by Formula (I) or a pharmaceutically acceptable salt, solvate, isomer, or prodrug thereof, wherein the compound of Formula (I) is:
  • R 1 is —(CH 2 ) a Y or —CH ⁇ CH—(CH 2 ) p Y.
  • Y is selected from —SO 3 H, —SO 3 —.X + , —SO 3 R 3 .
  • R 3 is selected from methyl and ethyl.
  • R 9 and R 9′ are, independently, a substituted or unsubstituted alkylsulfonyloxy group, a substituted or unsubstituted arylsulfonyloxy group, a substituted or unsubstituted alkylcarbonyloxy group or a substituted or unsubstituted arylcarbonyloxy group.
  • R 2 is selected from methylcarbonyl, phenylsulfonyl, 4-methylphenylsulfonyl, benzylsulfonyl, benzyl and phenyl
  • the compound of Formula (I) is selected from the group consisting of: 5-hydroxy-2- ⁇ [(4-methylphenyl)sulfonyl]oxy ⁇ benzenesulfonic acid; 2-hydroxy-5- ⁇ [(4-methylphenyl)sulfonyl]oxy ⁇ benzenesulfonic acid; 2,5-bis ⁇ [(4-methylphenyl)sulfonyl]oxy ⁇ benzenesulfonic acid; 2-(acetyloxy)-5-hydroxybenzenesulfonic acid; 5-(acetyloxy)-2-hydroxybenzenesulfonic acid; 2,5-bis(acetyloxy)benzenesulfonic acid; 5-hydroxy-2- ⁇ [(4-methylphenyl)sulfonyl]oxy ⁇ benzenehomosulfonic acid; 2-hydroxy-5- ⁇ [(4-methylphenyl)sulfonyl]oxy ⁇ benzenehomosulfonic acid; 2,5-bis ⁇ [(4-methyl
  • the compound of Formula (I) is selected from: 2-(acetyloxy)-5-hydroxybenzenesulfonic acid; 5-(acetyloxy)-2-hydroxybenzenesulfonic acid and 2,5-bis(acetyloxy)benzenesulfonic acid.
  • a compound of Formula (I) is administered topically.
  • the compound of Formula (I) is administered orally, buccally, transdermally, rectally, or otically.
  • the invention provides a method for the treatment and/or prophylaxis of psoriasis, further comprising administration of at least one additional therapeutic agent.
  • suitable therapeutic agents include those selected from the group consisting of: topical agents including corticoids and vitamin D analogs; systemic agents, including traditional agents such as methrotrexate, ciclosporin, retinoid and fumarates; biological agents, such as adalimunag, alefecept, afalizumab, etanercept and infliximab; a steroid, a retinoid, an antimicrobial compound, an antioxidant, an anti-inflammatory compound, salicylic acid, an endothelin antagonist, an immunomodulating agent, an angiogenesis inhibiting/blocking agent, a compound inhibiting FGF, VEGF, HGF and EGF or their respective receptors, a tyrosine kinase inhibitor, a protein kinase C inhibitor and a combination of two or more thereof.
  • topical agents including corticoids and vitamin D analogs
  • systemic agents including traditional agents such as methrotrexate, ciclosporin, retinoid and fumarate
  • the invention provides a method for the treatment and/or prophylaxis of psoriasis, further comprising at least one coadjuvant therapy selected from the group consisting of phototherapy and photochemotherapy.
  • the invention provides a method for the treatment and/or prophylaxis of psoriasis, wherein the compound of Formula (I) is administered at least once per week. In other embodiments, the compound is administered at least once per day or at least twice per day.
  • a compound of Formula (I) is present in a pharmaceutical composition in an amount of at least about 1% w/w. In other embodiments, the compound is present in a pharmaceutical composition in an amount of at least about 2.5% w/w, at least about 5% w/w, at least about 10% w/w, or at least about 15% w/w.
  • a compound of Formula (I) is administered over a period of at least about one week. In certain embodiments, the compound is administered over a period of at least about four weeks.
  • FIG. 1 shows the fibrosis induced in rat adipose tissue upon subcutaneously implanting a gelatin sponge containing only basic fibroblast growth factor (bFGF) (FIG. A) or containing bFGF plus 2,5-dihydroxybenzoate (FIG. B) for 7 days.
  • bFGF basic fibroblast growth factor
  • FIG. 2 shows the effect of the treatment with potassium 2,5-dihydroxybenzoate (gentisic acid) on the proliferation of rat glioma C6 cells.
  • 2,5-dihydroxybenzoate was administered or not administered (control) after seeding the C6 cells in 24-well plates (10 4 per well) until their fixing after 48 hours.
  • the data are expressed as mean ⁇ SEM of the absorbance at 595 nm, which is proportional to the number of cells stained with crystal violet.
  • the data were obtained from 3 cultures for each treatment.
  • the white bar represents the value of the control cells, whereas the black bars show the value in the presence of 2,5-dihydroxybenzoate (100, 200, 500 and 1000 ⁇ M).
  • *** indicates p ⁇ 0.001 with respect to the control by means of a single-factor analysis of variance (ANOVA) followed by a Student-Newman-Keuls post-analysis.
  • ANOVA single-factor analysis of variance
  • FIG. 3 shows the effect of the treatment with 3-(2,5-dihydroxyphenyl)-2-propenoic acid (2,5-dihydroxycinnamic acid; 2,5-DHC, 10-100 ⁇ M) on the proliferation of rat glioma C6 cells.
  • 2,5-DHC was administered or not administered (control) after seeding the C6 cells in 24-well plates (10 4 per well) until their fixing after 48 hours.
  • the data are expressed as the mean ⁇ SEM of the absorbance at 595 nm, which is proportional to the number of cells stained with crystal violet.
  • the data were obtained from 3 cultures for each treatment.
  • the white bar represents the value of the control cells, whereas the black bars show the values in the presence of 2,5-DHC (10, 25, 50 and 100 ⁇ M).
  • *** indicates p ⁇ 0.001 with respect to the control by means of a single-factor analysis of variance (ANOVA) followed by a Student-Newman-Keuls post-analysis.
  • ANOVA analysis of variance
  • FIG. 4 shows the effect of the intraperitoneal administration of potassium 2,5-dihydroxybenzene sulfonate (DHBS) and potassium 2,5-diacetoxybenzene sulfonate (DABS) on the progression of tumors established in rats after the subcutaneous implantation of rat glioma C6 cells (5 ⁇ 10 5 C6 cells).
  • DHBS potassium 2,5-dihydroxybenzene sulfonate
  • DABS 2,5-diacetoxybenzene sulfonate
  • the upper rows show the tumors developed in rats treated with carrier (0.9% NaCl) (i to xi)
  • the intermediate rows show the tumors developed in rats treated with DHBS (i.p.; 100 mg/kg/day for 10 days) (xii to xxiii)
  • the bottom rows show the tumors or the absence thereof (indicated by N.D.) in rats treated with DABS (i.p.; 100 mg/kg/day for 10 days) (xxiv to xxxvi).
  • the tumors were removed 10 days after the start of the treatment, which started once the presence of a tumor was verified on the fifth day after the implantation of glioma cells.
  • FIG. 5 Part A, shows the comparison of the volumes of the tumors developed in rats treated intraperitoneally with carrier (0.9% NaCl) (white bar), potassium 2,5-dihydroxibenzene sulfonate (DHBS; 100 mg/kg/day) (black bar) or potassium 2,5-diacetoxybenzene sulfonate (DABS; 100 mg/kg/day) (striped bar) for 10 days.
  • carrier 0.9% NaCl
  • DHBS potassium 2,5-dihydroxibenzene sulfonate
  • DABS potassium 2,5-diacetoxybenzene sulfonate
  • Part B includes the contingency table obtained as a result of analyzing the possibilities of a tumor being present or absent at the end of an experiment according to receiving treatment with DHBS (100 mg/kg/day) or with DABS (100 mg/kg/day).
  • the result of the analysis shows a ⁇ 2 value corresponding to p ⁇ 0.05, which indicates that the probability of being tumor-free is significantly higher in the group treated with DABS.
  • FIG. 6 shows the increase of apoptosis in the subcutaneous gliomas of rats treated with potassium 2,5-diacetoxybenzene sulfonate (DABS).
  • the upper photograph shows a section of a tumor obtained from a rat treated with carrier (0.9% NaCl, i.p.) in which a low apoptosis index is observed (A).
  • the lower photograph shows a section of a tumor obtained from a rat treated for 10 days with DABS (100 mg/kg/day, i.p.) in which a large number of cells in an apoptosis process is observed (B).
  • the sections are stained with hematoxylin and eosin and observed with a magnification of 313 times.
  • the arrows indicate the cells in an apoptosis process.
  • FIG. 7 shows the inhibition of human prostate cancer cell, PC-3 (A), and human lung cancer cell, A549 (B), proliferation by the treatment with potassium 2,5-diacetoxybenzene sulfonate (DABS; 1-200 ⁇ M).
  • DABS potassium 2,5-diacetoxybenzene sulfonate
  • FIG. 8 shows the inhibition caused by potassium 2,5-diacetoxybenzene sulfonate (DABS; 100 mg/kg/day, i.p.) on the growth of subcutaneous human prostate cell tumors induced by the subcutaneous implantation of PC-3 cells in athymic mice.
  • the implantation of tumor cells was carried out 10 days before starting the treatments.
  • the carrier group received saline serum injections (0.9% NaCl, i.p.).
  • the data correspond to 10 mice for each treatment.
  • the data are expressed as the mean ⁇ SEM of the tumor volume measured every 2 days through the skin with a Vernier caliper.
  • the volume reduction caused by DABS reaches statistical significance.
  • Panel B shows the effect of DABS on the weight of the tumor removed upon ending the assay. * p ⁇ 0.05 by means of an unpaired Student's t test.
  • FIG. 9 shows the inhibition of the mitogenesis induced by fibroblast growth factor 1 in quiescent Balb/c 3T3 fibroblast cultures by calcium 2-acetoxy-5-hydroxybenzene sulfonate (2A-5HBS) and potassium 2,5-dihydroxybenzene sulfonate (DHBS).
  • 2A-5HBS calcium 2-acetoxy-5-hydroxybenzene sulfonate
  • DHBS potassium 2,5-dihydroxybenzene sulfonate
  • FIG. 10 shows the inhibition of the mitogenesis induced by fibroblast growth factor 1 in quiescent Balb/c 3T3 fibroblast cultures by potassium 5-acetoxy-2-hydroxybenzene sulfonate (5A-2HBS) and potassium 2,5-dihydroxybenzene sulfonate (DHBS)
  • 5A-2HBS 5-acetoxy-2-hydroxybenzene sulfonate
  • DHBS 2,5-dihydroxybenzene sulfonate
  • FIG. 11 shows the inhibition of the mitogenesis induced by fibroblast growth factor 1 in quiescent Balb/c 3T3 fibroblast cultures by potassium 2.5-diacetoxybenzene sulfonate (DABS) and potassium 2,5-dihydroxybenzene sulfonate (DHBS).
  • DABS 2.5-diacetoxybenzene sulfonate
  • DHBS 2,5-dihydroxybenzene sulfonate
  • FIG. 12 shows the effect of the treatment with potassium 5-acetoxy-2-hydroxybenzene sulfonate (5-monoacetylated dobesilate; 5A-2HBS) and potassium 2-acetoxy-5-hydroxybencene sulfonate (2-monoacetylated dobesilate; 2A-5HBS) on the proliferation of rat glioma C6 cells.
  • 5A-2HBS and 2A-5HBS were administered or not administered (control) after seeding the C6 cells in 24-well plates (10 4 per well) until they were fixed after 48 hours.
  • the data are expressed as the mean ⁇ SEM of the percentage of the absorbance at 595 nm obtained in the control cultures, which is proportional to the number of cells stained with crystal violet.
  • the data were obtained from 3 cultures for each treatment and 6 control cultures.
  • the white bar represents the value of the control cells, whereas the black bar shows the value in the presence of 5A-2HBS (500 ⁇ M) and the striped bar shows the value in the presence of 2A-5HBS (500 ⁇ M).
  • *** indicates p ⁇ 0.001 with respect to the control by means of a single-factor analysis of variance (ANOVA) followed by a Student-Newman-Keuls post-analysis.
  • FIG. 13 shows 2-acetoxy-5-hydroxybenzenesulfonic acid co-crystallized with fibroblast growth factor-1.
  • the electronic density of the compound, contoured at 1 ⁇ (panel C), allows locating and determining the orientation of the compound with respect to the protein (panels A and B), as well as asserting that the compound conserves the acetoxyl group in position 2 when it binds to the protein.
  • the compound occupies a place that is very close to that described occupied by 2,5-dihydroxybenzenesulfonic acid, the aromatic ring of which forms a cation- ⁇ bond with the NE group of lysine 132, which is marked in panel A as reference.
  • Panel B shows, in the form of a mesh, the Van der Waals volume of 2-acetoxy-5-hydroxybenzenesulfonic acid, superimposed with its representation in the form of rods.
  • the protein surface is colored according to its electrostatic potential (light grey: negative charge; dark grey: positive charge; white: lack of charge).
  • FIG. 14 shows 5-acetoxy-2-hydroxybenzenesulfonic acid co-crystallized with fibroblast growth factor-1.
  • the electronic density of the compound, contoured at 1 ⁇ (panel C), allows locating and determining the orientation of the compound with respect to the protein (panels A and B), as well as asserting that the compound conserves the acetoxyl group in position 5 when it binds to the protein.
  • the compound occupies a place that is very close to that described occupied by 2,5-dihydroxybenzenesulfonic acid, the aromatic ring of which forms a cation- ⁇ bond with the N ⁇ group of lysine 132, which is marked in panel A as reference.
  • Panel B shows, in the form of a mesh, the Van der Waals volume of 2-acetoxy-5-hydroxybenzenesulfonic acid, superimposed with its representation in the form of rods.
  • the protein surface is colored according to its electrostatic potential (light grey: negative charge; dark grey: positive charge; white: lack of charge).
  • FIG. 15 shows 2,5-diacetoxybenzenesulfonic acid co-crystallized with fibroblast growth factor-1.
  • the electronic density of the compound, contoured at 1 ⁇ (panel C), allows locating and determining the orientation of the compound with respect to the protein (panels A and B), as well as asserting that the compound conserves the acetoxyl groups in positions 2 and 5 when it binds to the protein.
  • the compound occupies a place that is very close to that described occupied by 2,5-dihydroxybenzenesulfonic acid, the aromatic ring of which forms a cation- ⁇ bond with the N ⁇ group of lysine 132, which is marked in panel A as reference.
  • Panel B shows, in the form of a mesh, the Van der Waals volume of 2,5-diacetoxybenzenesulfonic acid, superimposed with its representation in the form of rods.
  • the protein surface is colored according to its electrostatic potential (light grey: negative charge; dark grey: positive charge; white: lack of charge).
  • patient relates to animals, preferably mammals, more preferably human beings, and includes men and women, and children and adults.
  • the expression “effective amount” relates to the amount of the compound and/or composition which is effective for achieving its desired purpose.
  • treat or “treatment” relate to the use of the compounds or compositions of the present invention in a prophylactic manner to prevent the symptoms of the disease or disorder, or in a therapeutic manner to improve an existing condition.
  • psoriasis relates to and includes diseases mediated by the immune system affecting the skin and joints. When it affects the skin, it normally appears in the form of raised, flaky red patches called plaques.
  • the commonest type of psoriasis accounting for 90% of all cases, is psoriasis vulgaris, in which papulosquamous plaques are well-delineated from surrounding normal skin. Plaques are usually distributed symetrically, and occur most commonly on the external aspect of elbows and knees; scalp (where they rarely encroach beyond the hairline), lumbosacral region, and umbilicus.
  • Active inflammatory psoriasis is characterised by the Koebner phenomenon, in which new lesions develop at sites of trauma or pressure.
  • psoriasis vulgaris Site-specific variants of psoriasis vulgaris exist. Flexural (inverse) psoriasis in intertriginous sites is shiny, red, and typically devoid of scales; sebopsoriasis has greasy scales and occurs in eyebrows, nasolabial folds and postauricular and prestemal sites. Children and adolescents can develop an acute form of psoriasis known as gutate psoriasis, in which papules less than 1 cm in diameter erupt on the trunk about 2 weeks after a Beta-haemolytic streptococcal infection such as tonsillitis or pharyngitis, or a viral infection.
  • Gutate psoriasis resolves within 3-4 months of onset, although its long-term prognosis is unknown.
  • Generalize pustular psoriasis (von Zumbusch psoriasis) is an acute form in which small, monomorphic sterile pustules develop in painful inflamed skin. Palmoplantar pustulosis, consisting of yellow-brown sterile pustules on palms and soles. About 25% of people with palmoplantar pustulosis also have chronic plaque psoriasis.
  • Psoriatic nail disease occurs most commonly in patients with psoriatic arthritis.
  • psoriatic arthritis is a seronegative inflamatory arthritis that occurs in the presence of psoriasis.
  • chemotherapy relates to the use of a chemotherapeutic agent for treating a cancer.
  • radiation therapy or “radiotherapy” relates to the medical use of ionization radiation as part of the cancer treatment to control cancer cells.
  • cancer immunotherapy relates to the stimulation of the immune system to reject or destroy tumors, and includes but is not limited to immunotherapy with bacillus Calmette-Guerin (BCG), topical immunotherapy, immunotherapy by injection and the like.
  • BCG Bacillus Calmette-Guerin
  • therapeutic agent includes any therapeutic agent that can be used to treat or prevent the diseases described herein.
  • therapeutic agents include but are not limited to chemotherapeutic agents, steroids, retinoids, antimicrobial compounds, antioxidants, anti-inflammatory compounds, NMDA receptor antagonists, endothelin antagonists, immunomodulating agents, vitamin D analogs, salicylic acid, and the like.
  • a therapeutic agent includes pharmaceutically acceptable salts thereof, prodrugs and pharmaceutical derivatives thereof.
  • antimicrobial compound relates to any compound altering the growth of bacteria, fungi or viruses whereby the growth is prevented, modified, reduced, stabilized, inhibited or stopped.
  • Antimicrobial compounds can be microbicides or microbiostatic agents and include but are not limited to antibiotics, semi-synthetic antibiotics, synthetic antibiotics, antifungal compounds, antiviral compounds and the like.
  • antifungal compound relates to any compound altering the growth of fungi whereby the growth is prevented, modified, reduced, stabilized, inhibited or stopped.
  • antiviral compound relates to any compound altering the growth of viruses whereby the growth is prevented, modified, altered, stabilized, inhibited or stopped.
  • antioxidant relates to and includes any compound that can react and inactivate a free radical, including but not limited to free radical eliminators, iron chelating agents, small molecule antioxidants and antioxidant enzymes and the like.
  • taxane relates to any compound containing the central carbon frame represented by Formula A:
  • NSAIDs relates to a non-steroidal anti-inflammatory compound or to a non-steroidal anti-inflammatory drug.
  • NSAIDs inhibit cyclooxygenase, the enzyme responsible for the biosynthesis of prostaglandins and certain autacoid inhibitors, including inhibitors of several cyclooxygenase isozymes (including but not limited to cyclooxygenase 1 and 2), and inhibitors of both cyclooxygenase and lipoxygenase.
  • organic cation relates to a positively charged organic ion.
  • organic cations include ammonium cations substituted with alkyl or unsubstituted ammonium cations, primary, secondary and tertiary amines, alkylamines, arylamines, cyclic amines, N,N′-dibenzylethylenediamine and the like.
  • inorganic cation relates to a positively charged metal ion.
  • examples of inorganic cations include Group I metal cations such as, for example, sodium, potassium, magnesium, calcium and the like.
  • general charge means the general or total charge of the compound.
  • topical relates to the administration of a compound by means of the application on the body surface and includes but is not limited to transdermal administration and administration through the mucous membrane.
  • transdermal relates to the administration of a compound passing through the skin into the blood stream.
  • the expression “through the mucous membrane” relates to the administration of a compound passing through the mucous tissue into the blood stream.
  • parenteral relates to the administration of a compound by subcutaneous, intravenous, intramuscular, intracardiac, intradermal, intraperitoneal, intrathecal or intracisternal injection, and also includes local and systemic infusion techniques.
  • penetration enhancement or “permeation enhancement” relates to an increase in the permeability of the skin or mucous tissue for a pharmacologically active compound selected such that it increases the amount and/or the rate at which the compound penetrates the skin or mucous membranes or traverses the skin and mucous membranes.
  • Excipients or “carriers” relate to suitable carrier materials for the administration of a compound and include any of said materials known in the art such as for example, any liquid, gel, solvent, liquid diluent, solubilizer or the like, which is not toxic and does not interact with any component of the composition in a harmful manner.
  • sustained release relates to the release of an active compound and/or composition such that the blood levels of the active compound are maintained in a desirable therapeutic interval for a time period.
  • the sustained release formulation can be prepared using any conventional method known by persons skilled in the art to obtain the desired release characteristics.
  • ester derivative of a compound of formula (I) refers to the compound of formula (I) wherein at least one of R 9 and R 9′ is an ester group.
  • ester derivative of 2,5-dihydroxybenzene sulfonic acid or dobesilate ester derivative refers to the compound 2,5-dihydroxybenzene sulfonic acid (dobesilate) wherein at least one of the hydroxyl groups has been esterified.
  • ester of a compound of formula (I) refers to an ester of the sulfonic or carboxylic acid group at position 1.
  • ester of 2,5-dihydroxybenzensulfonic acid or ester of dobesilate refers to an ester of the sulfonic acid group at position 1.
  • Alkyl relates to a linear or branched chain hydrocarbon radical formed by hydrogen and carbon atoms, which does not contain unsaturations, with one to twelve, preferably one to eight, more preferably one to six carbon atoms and which is joined to the rest of the molecule by a single bond, for example, methyl, ethyl, n-propyl, i-propyl, n-butyl, t-butyl, n-pentyl, etc.
  • Alkenyl relates to a linear or branched chain hydrocarbon radical formed by hydrogen and carbon atoms, containing at least one unsaturation, with two to twelve, preferably two to eight, more preferably two to six carbon atoms and which is joined to the rest of the molecule by a single bond.
  • Cycloalkyl relates to a saturated carbocyclic ring having between three and eight, preferably three and six carbon atoms. It can have a bridged structure. Suitable cycloalkyl groups include but are not limited to cycloalkyl groups such as cyclopropyl, cyclobutyl, cyclopentyl or cyclohexyl.
  • Aryl relates to an aromatic hydrocarbon radical having from six to ten carbon atoms such as phenyl or naphthyl.
  • Alkyl relates to an aryl group joined to the rest of the molecule by an alkyl group such as benzyl and phenethyl.
  • Heterocycle relates to a stable ring having 3 to 15 members consisting of carbon atoms and between one and five heteroatoms selected from the group consisting of nitrogen, oxygen and sulfur, preferably a ring having 4 to 8 members with one, two, three or four heteroatoms, more preferably a ring having 5 or 6 members with one, two or three heteroatoms.
  • the heterocycle can be a monocyclic, bicyclic or tricyclic ring system, which can include fused ring systems; bridged structures; and the nitrogen, carbon or sulfur atoms in the heterocyclyl radical can optionally be oxidized; the nitrogen atom can optionally be quaternized; and the heterocyclyl radical can be partially or completely saturated or be aromatic.
  • heterocycles include but are not limited to azepines, benzimidazole, benzothiazole, furan, isothiazole, imidazole, indole, piperidine, piperazine, purine, quinoline, thiadiazole, tetrahydrofuran.
  • alkyl, cycloalkyl, alkenyl, alkynyl, aryl, aralkyl and heterocycle radicals can optionally be substituted with one, two or three substituents such as halo, alkyl, alkenyl, alkynyl, cycloalkyl, hydroxy, alkoxy, sulfoxy, O-benzyl, O-benzoyl, carboxy, alkylcarboxy, arylcarboxy, alkylcarbonyl, arylcarbonyl, cyano, carbonyl, acyl, alkoxycarbonyl, amino, alkylamino, dialkylamino, arylamino, diarylamino, alkylarylamino, imino, alkylsulfinyl, amidyl, carbamoyl, sulfonamido, nitro, nitrite, nitrate, thionitrate and carboxamido.
  • substituents such as
  • alkoxycarbonyl relates to compounds with the Formula —C( ⁇ O)O—, in which the C-end is joined to the molecule and the O-end is joined to a carbon atom to form an ester function.
  • Said carbon atom can be part of an alkyl, alkenyl, cycloalkyl, alkynyl, aryl, aralkyl or heterocyclyl group.
  • alkoxycarbonylalkyl relates to compounds of Formula —C( ⁇ O)O-defined previously, in which the C-end is joined to the molecule through an alkyl group.
  • aryloxy- arylalkoxy- or alkylarylalkoxy-carbonylalkyl will be interpreted in a manner similar to the definition of “alkoxycarbonylalkyl”.
  • arylalkyl relates to an aryl radical, as defined herein, joined to an alkyl radical, as defined herein.
  • arylalkyl groups include benzyl, phenylethyl, 4-hydroxybenzyl, 3-fluorobenzyl, 2-fluorophenylethyl and the like.
  • alkylaryl relates to an alkyl group, as defined herein, to which an aryl group as defined herein is joined. Examples of alkylaryl groups include benzyl, phenylethyl, hydroxybenzyl, fluorobenzyl, fluorophenylethyl and the like.
  • alkylsulfonyl relates to R 50 —S(O) 2 —, where R 50 is a lower alkyl group as defined herein.
  • arylsulfonyl relates to R 55 —S(O) 2 —, where R 55 is an aryl group as defined herein.
  • alkylsulfinyl relates to R 55 —S(O)—, where R 55 is an aryl group as defined herein.
  • arylsulfinyl relates to R 55 —S(O)—, where R 55 is an aryl group as defined herein.
  • sulfonamide relates to —S(O) 2 —N(R 51 )(R 57 ), where R 51 and R 57 are each independently a hydrogen atom, an alkyl group, an aryl group, heterocyclic group, as defined herein, or R 51 and R 57 together form a heterocyclic ring, a cycloalkyl group, or a bridged cycloalkyl group, as defined herein.
  • alkylsulfonamide relates to a sulfonamido group as defined herein, bonded to an alkyl group as defined herein.
  • arylsulfonamide relates to a sulfonamido group as defined herein, bonded to an aryl group as defined herein.
  • alkylcarbonyl relates to R 52 —C(O) 2 —, where R 52 is an alkyl group as defined herein.
  • arylcarbonyl relates to the R 55 —C(O)— radical, where R 55 is an aryl group as defined herein.
  • Carboxamide relates to the —C(O)N(R 52 )(R 58 ) radical, where R 52 and R 58 are each independently a hydrogen atom, an alkyl group, an aryl group, or a heterocyclic group, as defined herein, or R 51 and R 57 together from a heterocyclic ring, a cycloalkyl group, or a bridged cycloalkyl group, as defined herein.
  • carboxylic ester relates to —C(O)OR 59 , where R 59 is an alkyl group, an aryl group or a heterocyclic group, as defined herein.
  • alkoxyalkyl relates to an alkoxy group as defined herein, bonded to an alkyl group as defined herein.
  • alkoxyalkyl groups are methoxymethyl, methoxyethyl, isopropoxymethyl and the like.
  • amine relates to any organic compound containing at least one basic nitrogen atom.
  • prodrug relates to compounds which are quickly transformed in vivo into pharmacologically active compounds.
  • the design of prodrugs is generally studied in Hardma et al. (Eds.), Goodman and Gilman's The Pharmacological Basis of Therapeutics, 9th ed., pages 11-16 (1996).
  • An in-depth study is carried out in Higuchi et al., Prodrugs as Novel Delivery Systems, Vol. 14, ASCD Symposium Series, and in Roche (ed.), Bioreversible Carriers in Drug Design, American Pharmaceutical Association and Pergamon Press (1987).
  • the compounds of the invention having one or more asymmetric carbon atoms can exist as optically pure enantiomers, pure diastereoisomers, mixtures of enantiomers, mixtures of diastereoisomers, racemic mixtures of enantiomers, diastereoisomeric racemates or mixtures of diastereoisomeric racemates. It must be understood that the invention foresees and includes all these isomers and mixtures thereof.
  • the present invention relates to the use of a 2,5-dihydroxybenzene derivative represented by Formula (I) or a pharmaceutically acceptable salt or solvate thereof, isomer or prodrug thereof to prepare a medicament for the therapeutic and/or prophylactic treatment of psoriasis, wherein the compound of Formula (I) is:
  • 2,5-dihydroxybenzene derivatives of the invention or any of the pharmaceutically acceptable salts thereof are those that are represented by Formula (I) comprising dobesilate esters derivatives or pharmaceutically acceptable salts or esters thereof for the treatment of psoriasis.
  • the cation X + in the compounds of Formula (I) can be any physiologically acceptable cation known by a person skilled in the art, and includes but is not limited to those described in Heinrich Stahl, Camille G. Wermuth (eds.), “Handbook of Pharmaceutical Salts Properties, Selections and Use”, Verlag Helvetica Chimica Acta, Zurich, Switzerland, Wiley-VCH, Weinheim, Germany, 2002; the entire descriptions of which are incorporated as a reference herein.
  • Cation X is selected such that the total charge of the compounds of Formula (I) is neutral.
  • R 1 is —(CH 2 ) a Y or —CH ⁇ CH—(CH 2 ) p Y. More particularly, Y is selected from —SO 3 H, —SO 3 —.X + , —SO 3 R 3 .
  • R 3 is selected from methyl, ethyl, isopropyl and C 6 H 5 —, more particularly methyl and ethyl.
  • R 9 and R 9′ are, independently, a substituted or unsubstituted alkylsulfonyloxy group, a substituted or unsubstituted arylsulfonyloxy group, a substituted or unsubstituted alkylcarbonyloxy group or a substituted or unsubstituted arylcarbonyloxy group.
  • R 2 is selected from methylcarbonyl, phenylsulfonyl, 4-methylphenylsulfonyl, benzylsulfonyl, benzyl and phenyl.
  • R 2 is selected from acetyl (—C(O)CH 3 ), tosyl (—SO 2 —C 6 H 4 —CH 3 ) and p-chlorophenoxyisobutyryl (—C(O)—C(CH 3 ) 2 —O—C 6 H 4 Cl).
  • the inorganic cation is sodium, potassium, lithium, calcium or magnesium.
  • the organic cation is [NH 4-p R p ] + , where p in each case is independently selected from an integer from 0 to 4; and R is an alkyl group of one to six carbon atoms such as, for example, methyl, ethyl, n-propyl, i-propyl, n-butyl, t-butyl or n-pentyl.
  • the organic cations are a diethylamino group [H 2 N + (C 2 H 5 ) 2 ], piperazine or pyridine.
  • the compounds of Formula (I) and pharmaceutically acceptable salts thereof are:
  • the compound of Formula (I) is selected from the group consisting of:
  • the therapeutic and/or prophylactic treatment of psoriasis is associated to phototherapy and photochemotherapy, as a coadjuvant therapy.
  • the compounds of Formula (I) can be synthesized by a person skilled in the art using conventional methods available on the market.
  • the synthesis of the compounds of Formula (I) is described, for example, in U.S. Pat. No. 5,082,941; and “The Merck Index” 13th edition, Merck & Co., R. Railway, N.J., USA, 2001; U.S. Pat. Nos. 5,082,841, 4,814,110, 4,613,332 and 4,115,648; the entire descriptions of which are incorporated as a reference herein.
  • the compounds of Formula (I) can also be in the form of solvates, particularly in the form of hydrates.
  • the compounds of Formula (I) as well as their solvates can be prepared by a person skilled in the art using conventional methods and reagents available on the market.
  • the scope of this invention includes any salt thereof, particularly any pharmaceutically acceptable salt of the compound.
  • pharmaceutically acceptable salts includes the metal salts or the addition salts which can be used in dosage forms.
  • the pharmaceutically acceptable salts of the compounds provided herein can be acid addition salts, base addition salts or metal salts, and can be synthesized from parent compounds containing a basic or acid residue by means of conventional chemical processes.
  • Such salts are generally prepared, for example, by reacting the free acid or base forms of these compounds with a stoichiometric amount of the suitable base or acid in water or in an organic solvent or in a mixture of both.
  • Non-aqueous media are generally preferred, such as ether, ethyl acetate, ethanol, isopropanol, or acetonitrile.
  • acid addition salts include mineral acid additions salts such as, for example, hydrochloride, hydrobromide, hydroiodide, sulfate, nitrate, phosphate, organic acid addition salts such as, for example, acetate, maleate, fumarate, citrate, oxalate, succinate, tartrate, malate, mandelate, methanesulfonate and p-toluenesulfonate.
  • alkali addition salts include inorganic salts such as, for example, ammonium salts and organic alkaline salts such as, for example, diethylamine, ethylenediamine, ethanolamine, N,N-dialkylenethanolamine, triethanolamine, glutamine and basic amino acid salts.
  • organic alkaline salts such as, for example, diethylamine, ethylenediamine, ethanolamine, N,N-dialkylenethanolamine, triethanolamine, glutamine and basic amino acid salts.
  • metal salts include, for example, sodium, potassium, calcium, magnesium, aluminium and lithium salts.
  • pharmaceutically acceptable relates to molecular entities and compositions that are physiologically tolerable and do not normally cause an allergic reaction or a similar adverse reaction, such as gastric discomfort, dizziness and the like, when administered to humans.
  • pharmaceutically acceptable preferably means that it is approved by a regulatory agency of the federal or state government or listed in the US pharmacopoeia or another pharmacopoeia, generally recognized for its use in animals and more particularly in human beings.
  • solvate must be understood to mean any form of the active compound according to the invention having another molecule (most likely a polar solvent) joined thereto by means of a non-covalent bond.
  • solvates include hydrates and alcoholates, preferably C 1 -C 6 alcoholates, methanolate for example.
  • the pharmaceutically acceptable salts of the compounds of Formula (I) can be obtained from organic or inorganic acids or bases by conventional methods by reacting the suitable acid or base with the compound.
  • the 2,5-dihydroxybenzene derivatives of the invention can optionally be used combining them with one another. Said combinations can be in the same formulation or in formulations which would be sequentially used.
  • the invention provides a composition comprising an ester derivative of those comprised in Formula (I), particularly a dobesilate ester derivative, such as 2-acetyloxy-5-hydroxybenzenesulfonic acid, 5-acetyloxy-2-hydroxybenzenesulfonic acid, or 2,5-bis-acetyloxybenzene sulfonic acid.
  • a dobesilate ester derivative such as 2-acetyloxy-5-hydroxybenzenesulfonic acid, 5-acetyloxy-2-hydroxybenzenesulfonic acid, or 2,5-bis-acetyloxybenzene sulfonic acid.
  • it will be desirable to formulate a composition of the invention with an active ingredient which is a dobesilate ester derivative for example, where the ester derivative shows greater therapeutic efficacy than the original compound in the treatment or prevention of a condition described herein.
  • the invention includes the use of a dobesilate ester derivative as a prodrug, for example, to treat a condition described herein, in which the ester is metabolized to the original compound in a patient for the purpose of reaching therapeutic efficacy in the patient.
  • compositions comprising at least one compound of Formula (I) and at least one additional therapeutic agent, including but not limited topical agents including corticoids and vitamin D analogs; systemic agents, including traditional agents such as methrotrexate, ciclosporin, retinoid and fumarates; biological agents, such as adalimunag, alefecept, afalizumab, etanercept and infliximab; a steroid, a retinoid, an antimicrobial compound, an antioxidant, an anti-inflammatory compound, salicylic acid, an endothelin antagonist, an immunomodulating agent, an angiogenesis inhibiting/blocking agent, a compound inhibiting FGF, VEGF, HGF and EGF or their respective receptors, a tyrosine kinase inhibitor, a protein kinase C inhibitor and a combination of two or more of them.
  • the therapeutic agent includes anti-inflammatory compounds.
  • the invention also provides said compositions in a pharmaceutically
  • the compounds of Formula (I) can optionally be used together with one or more additional therapeutic agents; such as topical agents including corticoids and vitamin D analogs; systemic agents, including traditional agents such as methrotrexate, ciclosporin, retinoid and fumarates; biological agents, such as adalimunag, alefecept, afalizumab, etanercept and infliximab; a steroid, a retinoid, an antimicrobial compound, an antioxidant, an anti-inflammatory compound, salicylic acid, an endothelin antagonist, an immunomodulating agent, an angiogenesis inhibiting/blocking agent, a compound inhibiting FGF, VEGF, HGF and EGF or their respective receptors, a tyrosine kinase inhibitor, a protein kinase C inhibitor and a combination of two or more of them.
  • additional therapeutic agents such as topical agents including corticoids and vitamin D analogs; systemic agents, including traditional agents such as methrotre
  • Suitable steroids include but are not limited to budesonide, dexamethasone, corticosterone, prednisolone and the like. Suitable steroids are described in more detail in the literature, such as in The Merck Index on CD-ROM, 13th Edition. In a preferred embodiment of the invention, the steroids are dexamethasone, prednisolone and corticosteroids.
  • Suitable retinoids include but are not limited to natural and synthetic analogs of vitamin A (retinol), vitamin A aldehyde (retinal), vitamin A acid (retinoic acid (RA)), including all the trans-, 9-cis- and 13-cis-retinoic acids), tretinoin, isotretinoin, alitretinoin, etretinate, acitretin, tazarotene, bexarotene and the like. Suitable retinoids are also described in document EP 0379367 A2, U.S. Pat. Nos.
  • Suitable antimicrobial compounds include but are not limited to macrolides such as, for example, azithromycin, clarithromycin, dirithromycin, erythromycin, milbemycin, troleandomycin and the like; monobactams such as, for example, aztreonam and the like; tetracyclines such as, for example, demeclocycline, doxycycline, minocycline, oxytetracycline, tetracycline and the like; aminoglycosides such as, for example, amikacin, gentamicin, kanamycin, neomycin, netilmicin, paromomycin, streptomycin, tobramycin and the like; carbacephems such as, for example, loracarbef and the like; carbapenems such as, for example, ertapenem, imipenem, meropenem and the like; penicillins such as, for example, amoxicillin, ampicillin, azlocillin, carb
  • Suitable antimicrobial compounds of the invention are more fully described in the literature, such as in Goodman and Gilman, The Pharmacological Basis of Therapeutics (9th Edition), McGraw-Hill, (1996); Merck Index on CD-ROM, 13th Edition; STN Express, file phar and file registry, the entire descriptions of which are incorporated herein as a reference.
  • the antimicrobial compounds are tetracycline, erythromycin or clindamycin.
  • Suitable antioxidants include but are not limited to free radical eliminators, iron chelating agents, small molecule antioxidants and antioxidant enzymes and the like.
  • Suitable iron chelating agents include but are not limited to deferoxamine, deferiprone, dithiocarbamate, ethylenediaminetetraacetic acid and the like.
  • Suitable small molecule antioxidants include but are not limited to compounds of hydralazine, glutathione, ascorbic acid (vitamin C), vitamin E, cysteine, N-acetyl-cysteine, ⁇ -carotene, ubiquinone, ubiquinol-10, tocopherols, coenzyme Q, superoxide dismutase mimetics such as, for example, 2,2,6,6-tetramethyl- 1-piperidinyloxy (TEMPO), DOXYL, PROXYL nitroxide compounds; 4-hydroxy-2,2,6,6-tetramethyl-1-piperidinyloxy (TEMPOL), M-40401, M-40403, M-40407, M-40419, M-40484, M-40587, M-40588 and the like.
  • Suitable antioxidant enzymes include but are not limited to superoxide dismutase, catalase, glutathione peroxidase, NADPH oxidase inhibitors such as, for example, apocynin, aminoguanidine, ONO 1714, S17834 (a benzo(b)pyran-4-one derivative) and the like; xanthine oxidase inhibitors such as, for example, allopurinol, oxypurinol, amflutizole, diethyldithiocarbamate, 2-styrylchromones, crisine, luteolin, kaempferol, quercetin, myricetin, isorhamnetin, benzophenones such as 2,2′,4,4′-tetrahydroxybenzophenone, 3,4,5,2′,3′,4′-hexahydroxybenzophenone and 4,4′-dihydroxybenzophenone; benzothiazinone analogs such as 2-amino-4H-1
  • the antioxidant enzymes can be released by gene therapy in the form of a viral vector and/or a non-viral vector. Suitable antioxidants are described in more detail in the literature, such as in Goodman and Gilman, The Pharmacological Basis of Therapeutics (9th Edition), McGraw-Hill, 1995; and The Merck Index on CD-ROM, Thirteenth Edition; and in STN Express, file phar and file registry. In some preferred embodiments, the antioxidants are ascorbic acid, vitamin E, apocynin, hydralazine compounds or superoxide dismutase mimetics.
  • Suitable NSAIDs include but are not limited to acetaminophen, acemetacin, aceclofenac, alminoprofen, amfenac, bendazac, benoxaprofen, bromfenac, bucloxic acid, butibufen, carprofen, cinmetacin, clopirac, diclofenac, etodolac, felbinac, fenclozic acid, fenbufen, fenoprofen, fentiazac, flunoxaprofen, flurbiprofen, ibufenac, ibuprofen, indometacin, isofezolac, isoxepac, indoprofen, ketoprofen, lonazolac, loxoprofen, metiazinic acid, mofezolac, miroprofen, naproxen, oxaprozin, pirazolac, pirprofen, pr
  • Suitable NSAIDs are more fully described in the literature, such as in Goodman and Gilman, The Pharmacological Basis of Therapeutics (9th Edition), McGraw-Hill, 1995, pages 617-657; the Merck Index on CD-ROM, 13th Edition; and in U.S. Pat. Nos. 6,057,347 and 6,297,260 issued to NitroMed. Inc., the entire descriptions of which are incorporated herein as a reference.
  • the NSAIDs are acetaminophen, diclofenac, flurbiprofen, ibuprofen, indometacin, ketoprofen, naproxen or aspirin.
  • NMDA receptor antagonists include but are not limited to ketamine, dextromethorphan, memantine, amantadine, nitrous oxide, gacyclidine and the like. In some preferred embodiments, the NMDA receptor antagonist is dextromethorphan.
  • Suitable endothelin antagonists include but are not limited to atrasentan, bosentan, darusentan, enrasentan, sitaxsentan, sulfonamide, tezosentan, BMS 193884, BQ-123, SQ 28608 and the like. Suitable endothelin antagonists are described in more detail in the literature, such as in Goodman and Gilman, The Pharmacological Basis of Therapeutics (9th Edition), McGraw-Hill, 1995; and The Merck Index on CD-ROM, Thirteenth Edition; and in STN Express, file phar and file registry.
  • Suitable immunomodulating agents include but are not limited to interferon ⁇ IIb, autologous granulocyte-macrophage colony stimulating factor, APC 8015 (Provenge), anti-cancer vaccines, anti-sense oligonucleotides, bacillus Calmette-Guerin (BCG) and the like.
  • Suitable vitamin D analogs include but are not limited to vitamin D3 analogs such as colecalciferol, calcidiol, calcitriol and the like.
  • the invention relates to a method for the treatment and/or prophylaxis of psoriasis which comprises administering, to a patient who needs it, an effective amount of a compound of Formula (I), a pharmaceutically acceptable salt and solvate, isomer or prodrug thereof described herein.
  • An effective amount of at least one 2,5-dihydroxybenzene compound of Formula (I) can be administered to the patient for example.
  • an effective amount of at least one 2,5-dihydroxybenzene compound of Formula (I), and at least one additional therapeutic agent including but not limited to those such as, for example, topical agents including corticoids and vitamin D analogs; systemic agents, including traditional agents such as methrotrexate, ciclosporin, retinoid and fumarates; biological agents, such as adalimunag, alefecept, afalizumab, etanercept and infliximab; a steroid, a retinoid, an antimicrobial compound, an antioxidant, an anti-inflammatory compound, salicylic acid, an endothelin antagonist, an immunomodulating agent, an angiogenesis inhibiting/blocking agent, a compound inhibiting FGF, VEGF, HGF and EGF or their respective receptors, a tyrosine kinase inhibitor, a protein kinase C inhibitor and a combination of two or more of them.
  • topical agents including corticoids and vitamin D analogs
  • 2,5-dihydroxybenzene derivatives of Formula (I) can optionally be used by combining them with one another. Said combinations can be in the same formulation or in formulations which will be sequentially used.
  • the 2,5-dihydroxybenzene compound of Formula (I) can be administered approximately at the same time as part of the overall treatment regimen, i.e. as a combination therapy.
  • the expression “approximately at the same time” includes administering the 2,5-dihydroxybenzene compound simultaneously, sequentially, at the same time, at different times in the same day, on different days, as long as it is administered as part of an overall treatment regimen, i.e. a combination therapy or a therapeutic cocktail.
  • the compounds and compositions of the invention can be administered in combination with pharmaceutically acceptable carriers and in the dosages described herein.
  • the compounds and compositions of the invention When administered, the compounds and compositions of the invention are administered as a combination of at least one 2,5-dihydroxybenzene compound of formula (I) and/or at least one additional therapeutic agent, they can also be used in combination with one or more additional compounds which are known to be effective against the specific pathology set as a treatment target.
  • the therapeutic agents and/or the different additional compounds can be administered simultaneously with, after or before the administration of the 2,5-dihydroxybenzene compound.
  • the 2,5-dihydroxybenzene compounds of formula (I) are administered topically, transdermally, orally, buccally, parenterally, rectally (for example, with the use of suppositories) or otically in unit dosage formulations containing excipients, adjuvants, and conventional, non-toxic pharmaceutically acceptable carriers, as desired.
  • 2,5-dihydroxybenzene compounds of formula (I) are administered by topical application.
  • the solid dosage forms for oral administration can include capsules, sustained release capsules, tablets, sustained release tablets, chewable tablets, sublingual tablets, effervescent tablets, pills, suspensions, powders, granules and gels.
  • the active compounds in said solid dosage forms can be mixed with at least one inert diluent such as sucrose, lactose or starch.
  • Said dosage forms can also comprise, as in normal practice, additional substances different from the inert substances, for example, lubricants such as magnesium stearate.
  • the dosage forms can also comprise buffering agents.
  • the soft gelatin capsules can be prepared such that they contain a mixture of the active compositions or compounds of the invention and vegetable oil.
  • Hard gelatin capsules can contain granules of the active compound combined with a solid, powdery carrier, such as lactose, sucrose, sorbitol, mannitol, potato starch, corn starch, amylopectin, cellulose derivatives and gelatin.
  • a solid, powdery carrier such as lactose, sucrose, sorbitol, mannitol, potato starch, corn starch, amylopectin, cellulose derivatives and gelatin.
  • the tablets and pills can be prepared with enteric coatings.
  • the liquid dosage forms for oral administration can include pharmaceutically acceptable emulsions, solutions, syrups and elixirs containing inert diluents commonly used in the art, such as water.
  • Said compositions can also comprise adjuvants, such as wetting agents, emulsifying and suspension agents, and sweeteners, flavoring agents and perfuming agents.
  • Suppositories for vaginal or rectal administration of the compounds and compositions of the invention stand out among rectal and vaginal administration forms; such suppositories can be prepared by mixing the compounds or compositions with a suitable non-irritating excipient such as cocoa butter and polyethyleneglycols which are solid at room temperature but liquid at rectal temperature, such that they will melt in the rectum and vagina and release the compounds and compositions.
  • a suitable non-irritating excipient such as cocoa butter and polyethyleneglycols which are solid at room temperature but liquid at rectal temperature, such that they will melt in the rectum and vagina and release the compounds and compositions.
  • the injectable preparations for example, injectable and sterile aqueous or oily suspensions can be formulated according to the known art using suitable dispersing agents, wetting agents and/or suspension agents.
  • the sterile injectable preparation can also be a sterile injectable solution or suspension in a non-toxic, parenterally acceptable diluent or solvent, for example, a solution in 1,3-butanediol. Included among the acceptable carriers and solvents which can be used are water, Ringer solution, and isotonic sodium chloride solution.
  • the sterile fixed oils are also conventionally used as solvents or suspension mediums.
  • the topical administration of the compounds and compositions of the invention can be in the form of creams, gels, lotions, liquids, ointments, spray solutions, sprays, solid bars, emulsions, microemulsions and the like which can be formulated according to the conventional methods using suitable excipients, such as, for example, emulsifying agents, surfactants, thickeners, sun protection agents, wetting agents, cooling agents, skin relaxing agents, skin conditioning agents, skin protectors, emollients, wetting agents, dyes and combinations of two or more of them.
  • suitable excipients such as, for example, emulsifying agents, surfactants, thickeners, sun protection agents, wetting agents, cooling agents, skin relaxing agents, skin conditioning agents, skin protectors, emollients, wetting agents, dyes and combinations of two or more of them.
  • compositions and/or transdermal patches can be formulated with one or more preservatives or bacteriostatic agents including but not limited to methyl hydroxybenzoate, propyl hydroxybenzoate, chlorocresol, benzalkonium chloride and the like.
  • Fabric pads or balls of a bandage-type material for example gauze, can be impregnated with the compositions in solution, lotion, cream, ointments or other form which can also be used for topical application.
  • the compositions of the invention are administered in the form of a transdermal patch.
  • compositions of the invention are administered in the form of a sustained release transdermal patch.
  • the transdermal patches of the invention can include any conventional form such as, for example, an adhesive matrix, a polymeric matrix, a patch with a deposit, a matrix-type or monolithic laminated structure, and they are generally formed by one or more reinforcing layers, adhesives, penetration enhancers, an optional membrane controlling the rate, and a release coating which is removed to expose the adhesives before the application.
  • the polymeric matrix patches also comprise a material forming a polymeric matrix. Suitable transdermal patches are described in more detail in, for example, U.S. Pat. Nos. 5,262,165, 5,948,433, 6,010,715 and 6,071,531, the entire descriptions of which are incorporated herein.
  • compositions of this invention can additionally include conventional excipients, i.e. pharmaceutically acceptable organic or inorganic substance carriers, suitable for the parenteral application that do not dangerously react with the active compounds.
  • suitable pharmaceutically acceptable carriers include, for example, water, saline solutions, alcohol, vegetable oils, polyethyleneglycols, gelatin, lactose, amylose, magnesium stearate, talc, surfactants, silicic acid, viscous paraffin, perfuming oil, monoglycerides and diglycerides of fatty acids, petroethral fatty acid esters, hydroxymethylcellulose, polyvinylpyrrolidone and the like.
  • the pharmaceutical preparations can be sterilized and, if desired, mixed with auxiliary agents, for example, lubricants, preservatives, stabilizers, wetting agents, emulsifying agents, salts for affecting osmotic pressure, buffers, dyes, flavoring agents and/or aromatic substances and the like which do not dangerously react with the active compounds.
  • auxiliary agents for example, lubricants, preservatives, stabilizers, wetting agents, emulsifying agents, salts for affecting osmotic pressure, buffers, dyes, flavoring agents and/or aromatic substances and the like which do not dangerously react with the active compounds.
  • the particularly suitable carriers consist of preferably oily or aqueous solutions, as well as suspensions, emulsions or implants.
  • the aqueous suspensions can contain substances which increase the viscosity of the suspension and include, for example, sodium carboxymethylcellulose, sorbitol and/or dextran.
  • the suspension can also optionally contain stabilizers.
  • the composition can also contain minor amounts of wetting agents, emulsifying agents and/or pH buffering agents.
  • the composition can be a liquid solution, suspension, emulsion, tablet, pill, capsule, sustained release formulation or powder.
  • the composition can be formulated as a suppository, with traditional binding agents and carriers such as triglycerides.
  • the oral formulations can include conventional carriers such as pharmaceutical grade mannitol, lactose, starch, magnesium stearate, sodium saccharine, cellulose, magnesium carbonate and the like.
  • Different delivery systems are known and can be used to administer the compounds or compositions of the invention, including, for example, encapsulation in liposomes, microbubbles, emulsions, microparticles, microcapsules and the like.
  • the required dosage can be administered in single unit form or in sustained release form.
  • the oral administration form of the compounds of 2,5-dihydroxybenzene is in a sustained release form additionally comprising at least one coating or matrix.
  • the sustained release coating or matrix includes but is not limited to natural, semi-synthetic or synthetic polymers insoluble in water, modified polymers, waxes, fats, fatty alcohols, fatty acids, natural, semi-synthetic or synthetic plasticizers, or a combination of two or more of them.
  • Suitable polymers insoluble in water include but are not limited to acrylic resins such as, for example, poly(meth)acrylates, polyalkyl(C14)-(meth)acrylates, polydialkyl(C 1-4 )aminoalkyl(C 1-4 )-(meth)acrylates and/or copolymers and the like, and combinations of two or more of them; of ethyl acrylate and methyl methacrylate copolymers with a 2:1 molar monomer ratio (EUDRAGIT NE30D®), ethyl acrylate, methyl methacrylate and triethylammonium ethyl methacrylate chloride copolymers with a 1:2:0.1 molar monomer ratio (EUDRAGIT RS®), ethyl acrylate, methyl methacrylate and triethylammonium ethyl methacrylate chloride copolymers with a 1:2:0.2 molar monomer ratio (EUDRAGIT
  • Suitable polymers insoluble in water include but are not limited to cellulose derivatives, such as, for example, alkylcelluloses, ethylcellulose, cellulose esters, cellulose acetate, AQUACOAT®, SURELEASE® and the like.
  • Suitable natural, semisynthetic or synthetic waxes, fats or fatty alcohols include but are not limited to carnauba wax, beeswax, glycerol monostearate, glycerol monobehenate, glycerol ditripalmitostearate, microcrystalline wax, cetyl alcohol, cetylstearyl alcohol and the like, and combinations of two or more of them.
  • Suitable plasticizers include but are not limited to lipophilic diesters of an aliphatic or aromatic C 6 -C 40 dicarboxylic acid, C 1 -C 8 aliphatic alcohols, such as, for example, dibutyl phthalate, diethyl phthalate, dibutyl sebacate, diethyl sebacate and the like; hydrophilic or lipophilic citric acid esters, such as, for example, triethyl citrate, tributyl citrate, acetyltributyl citrate, acetyltriethyl citrate and the like; polyethyleneglycols, propyleneglycols, glycerol esters, such as, for example, triacetine, MYVACET® (acetylated mono and diglycerides, C 23 H 44 O 5 to C 25 H 47 O), triglycerides of medium chain length (MIGLYOL®), oleic acid or mixtures of at least two of said plasticizers
  • the sustained release formulations can also comprise other conventional excipients known by persons skilled in the art, such as, for example, lubricants, colored pigments, surfactants and the like.
  • the sustained release formulations can also contain an enteric coating, such that they are gastroresistant.
  • Suitable enteric coatings include but are not limited to methacrylic acid/methyl methacrylate copolymers with a 1:1 molar monomer ratio (EUDRAGIT L®), methacrylic acid/methyl methacrylate copolymers with a 1:2 molar monomer ratio (EUDRAGIT S®), methacrylic acid/ethyl acrylate copolymers with a 1:1 molar monomer ratio (EUDRAGIT L30D-55®), methacrylic acid/methyl acrylate/methyl methacrylate copolymers with a 7:3:1 molar monomer ratio (EUDRAGIT FS®), shellac, hydroxypropylmethylcellulose, acetate-succinates, cellulose acetate-phthalates or a combination of two or more of them.
  • EUDRAGIT L® methacrylic acid/methyl methacrylate copolymers with a 1:1 molar monomer ratio
  • EUDRAGIT S® methacrylic acid/methyl methacrylate copo
  • enteric coatings can also be optionally used in combination with the water-insoluble poly(meth)acrylates described herein.
  • the enteric coatings are used in combination with EUDRAGIT NE30D® and/or EUDRAGIT RL® and/or EUDRAGIT RS®.
  • enteric coatings can be applied using conventional processes known by persons skilled in the art, as described in, for example, Johnson, J. L., “Pharmaceutical tablet coating”, Coatings Technology Handbook (Second Edition), Satas, D. and Tracton, A. A. (eds), Marcel Dekker, Inc. New York, (2001), 863-866; Carstensen, T., “Coating Tablets in Advanced Pharmaceutical Solids”, Swarbrick, J. (ed.), Marcel Dekker, Inc. New York (2001), 455-468; Leopold, C. S., “Coated dosage forms for colon-specific drug delivery”, Pharmaceutical Science & Technology Today, 2 (5), 197-204 (1999), Rhodes, C. T. and Porter, S.
  • the sustained release formulations comprising at least one 2,5-dihydroxybenzene compound of the invention are in an immediate release form and in a sustained release form in the same formulation.
  • the formulation can additionally comprise at least one additional therapeutic agent, such as, for example, chemotherapeutic agents, steroids, retinoids, antimicrobial compounds, antioxidants, anti-inflammatory compounds, and combinations of two or more of them.
  • the determination of the optimal ranges for effective amounts of the compounds and/or compositions is part of the common experience of persons skilled in the art.
  • the necessary dosage for providing an effective amount of the compounds and compositions will vary depending on age, health, physical condition, gender, diet, weight, degree of the disorder of the receptor, treatment frequency and nature and scope of the disorder or disease, medical condition of the patient, the administration route, pharmacological considerations such as activity, efficacy, pharmacokinetic profile and of toxicology of the particular compound used, if a drug delivery system is used, and if the compound is administered as part of a combination of drugs.
  • the amount of a given 2,5-dihydroxybenzene compound that will be effective in treating a particular disorder or condition will depend on the nature of the disorder or condition, and can be determined by conventional clinical techniques, including the reference to Goodman and Gilman, above; The Physician's Desk Reference, Medical Economics Company, Inc., Oradell, N. J., 1995; and Drug Facts and Comparisons, Inc., St. Louis, Mo., 1993; the entire descriptions of which are incorporated herein as a reference.
  • the exact dose to be used in the formulation will also depend on the administration route and the severity of the disease or disorder, and must be chosen by the physician and in accordance with the patient's circumstances.
  • duration of treatment will typically depend on the particular condition, its severity, the condition of the patient, and the like, and will readily be determined by one of skill in the art.
  • Illustrative courses of therapy include 1 week, 2 weeks, 3 weeks, 4 weeks, 5 weeks, 6 weeks, 7 weeks, 8 weeks, 9 weeks, 10 weeks, 11 weeks, 12 weeks, 3.5 months, 4 months, 4.5 months, 5 months, 6 months, 9 months, a year, or longer as needed.
  • treatment may be continued until at least a 10% improvement is effected in a symptom associated with the condition.
  • treatment is continued until the subject in need of such treatment experiences an improvement of at least about 20%, at least about 30%, at least about 40%, preferably at least about 50%, preferably at least about 60%, more preferably at least about 70%, more preferably at least about 80%, even more preferably 90% or greater in a symptom associated with a disorder described herein.
  • a compound of formula (I) is administered at least once per week. In other embodiments, a compound of formula (I) is administered at least once per day. In yet other embodiments, a compound of formula (I) is administered twice per day. In another particular embodiment, a compound of formula (I) is administered over a period of at least about one week. In other embodiments, a compound of formula (I) is administered over a period of at least about four weeks.
  • Therapeutic amounts can be empirically determined and will vary with the particular condition being treated, the subject, the particular formulation components, dosage form, and the like.
  • a compound of formula (I) is present in a pharmaceutical composition in an amount of at least about 1% w/w. In other embodiments, a compound of formula (I) is present in a pharmaceutical composition in an amount of at least about 2.5% w/w, at least about 5% w/w, at least about 10% w/w, or at least about 15% w/w.
  • the 2,5-dihydroxybenzene compounds of Formula (I) can be administered by transdermal, oral, buccal, parenteral, rectal or otical route in an amount of approximately 0.05 g a day to approximately 50 g a day.
  • the 2,5-dihydroxybenzene compounds of Formula (I) can be administered by transdermal, oral, buccal, parenteral, rectal or otical route in an amount of approximately 0.10 g a day to approximately 25 g a day.
  • the 2,5-dihydroxybenzene compounds of Formula (I) can be administered by transdermal, oral, buccal, parenteral, rectal or otical route in an amount of approximately 0.25 g a day to approximately 10 g a day. In a more particular embodiment, the 2,5-dihydroxybenzene compounds of Formula (I) can be administered in an amount of approximately 0.5 g a day to approximately 5 g a day. In an even more particular embodiment, the 2,5-dihydroxybenzene compounds of Formula (I) can be administered in an amount of approximately 0.75 g a day to approximately 2.5 g a day.
  • the 2,5-dihydroxybenzene compounds of Formula (I) can be administered in an amount of approximately 1 g a day to approximately 1.5 g a day.
  • the particular amounts of the 2,5-dihydroxybenzene compounds of Formula can be administered in the form of a single dose once a day; or in multiple doses several times throughout the entire day; or as a sustained release oral formulation.
  • approximately 50 g, 25 g, 10 g, 5 g, 1 g, 0.75 g, 0.5 g, 0.25 g or 0.1 g of the 2,5-dihydroxybenzene compounds of Formula (I) are administered once a day (q.d) by transdermal, oral, buccal, parenteral, rectal or otical route.
  • approximately 50 g, 25 g, 10 g, 5 g, 1 g, 0.75 g, 0.5 g, 0.25 g or 0.1 g of the 2,5-dihydroxybenzene compounds of Formula (I) are administered twice a day (b.i.d) by transdermal, oral, buccal, parenteral, rectal or otical route.
  • approximately 50 g, 25 g, 10 g, 5 g, 1 g, 0.75 g, 0.5 g, 0.25 g or 0.1 g of the 2,5-dihydroxybenzene compounds of Formula (I) are administered three times a day (t.i.d.) by transdermal, oral, buccal, parenteral, rectal ar or otical route.
  • approximately 50 g, 25 g, 10 g, g, 1 g, 0.75 g, 0.5 g, 0.25 g or 0.1 g of the 2,5-dihydroxybenzene compounds of Formula (I) are administered four times a day by transdermal, oral, buccal, parenteral, rectal or otical route.
  • the compounds of 2,5-dihydroxybenzene of Formula (I) can be administered by topical route in a formulation comprising an amount of approximately 0.001% to approximately 30% (w/w) of the 2,5-dihydroxybenzene compounds of Formula (I).
  • the 2,5-dihydroxybenzene compounds of Formula (I) can be administered by topical route in a formulation comprising an amount of approximately 0.01% to approximately 20% (w/w) of the 2,5-dihydroxybenzene compounds of Formula (I).
  • the 2,5-dihydroxybenzene compounds of Formula (I) can be administered by topical route in a formulation comprising an amount of approximately 0.1% to approximately 15% (w/w) of the 2,5-dihydroxybenzene compounds of Formula (I). In a more particular embodiment, the 2,5-dihydroxybenzene compounds of Formula (I) can be administered by topical route in a formulation comprising an amount of approximately 0.5% to approximately 10% (w/w) of the 2,5-dihydroxybenzene compounds of Formula (I).
  • the 2,5-dihydroxybenzene compounds of Formula (I) can be administered by topical route in a formulation comprising an amount of approximately 1% to approximately 5% (w/w) of the 2,5-dihydroxybenzene compounds of Formula (I).
  • the 2,5-dihydroxybenzene compounds of Formula (I) can be administered by topical route in a formulation comprising an amount of approximately 2.5% to approximately 4% (w/w) of the 2,5-dihydroxybenzene compounds of Formula (I).
  • the topical formulation comprising the 2,5-dihydroxybenzene compounds of Formula (I) can be administered in the form of a single dose once a day; or in multiple doses several times throughout the entire day.
  • the topical formulation comprising approximately 30%, 20%, 15%, 10%, 5%, 2.5%, 1%, 0.5%, 0.1% or 0.001% of the 2,5-dihydroxybenzene compounds of Formula (I) is administered four times a day.
  • the topical formulation comprising approximately 30%, 20%, 15%, 10%, 5%, 2.5%, 1%, 0.5%, 0.1% or 0.001% of the 2,5-dihydroxybenzene compounds of Formula (I) is administered three times a day.
  • the topical formulation comprising approximately 30%, 20%, 15%, 10%, 5%, 2.5%, 1%, 0.5%, 0.1% or 0.001% of the 2,5-dihydroxybenzene compounds of Formula (I) is administered twice a day (b.i.d).
  • the topical formulation comprising approximately 30%, 20%, 15%, 10%, 5%, 2.5%, 1%, 0.5%, 0.1% or 0.001% of the 2,5-dihydroxybenzene compounds of Formula (I) is administered once a day.
  • the invention provides a kit or package comprising a compound of formula (I), in packaged form, accompanied by instructions for use.
  • the compound of formula (I) may be packaged in any manner suitable for administration, so long as the packaging, when considered along with the instructions for administration, indicates the manner in which the compound of formula (I) is to be administered.
  • a kit may comprise a compound of formula (I) in unit dosage form, along with instructions for use.
  • such instructions may indicate that administration of a compound of formula (I) is useful in the treatment of psoriasis.
  • the compound of formula (I) may be packaged in any manner suitable for administration.
  • the kit may comprise a sealed container of coated tablets, blister strips containing the tablets, or the like.
  • the packaging may be in any form commonly employed for the packaging of pharmaceuticals, and may utilize any of a number of features such as different colors, wrapping, tamper-resistant packaging, blister packs or strips, and the like.
  • the following example shows the efficacy of 2,5-dihydroxybenzoate to reduce the proliferative capacity of glioma cells and supports the use of the compound in treating gliomas.
  • the cell line used was rat glioma C6 cells.
  • the cells were cultured as previously described (Cuevas P et al. Neurol Res, 2005).
  • the cells were cultured as adherent cells in Dulbecco's modified Eagle's medium, supplemented with 7.5% (v/v) of fetal bovine serum, 10 ⁇ g/ml of streptomycin and 10 units/ml of penicillin.
  • the tumor cells were seeded in 24-well plates at a density of 10,000 cells/well, and were incubated at 37° C. in a humidified chamber with 5% CO 2 .
  • the cells were treated or not (controls) with 2,5-dihydroxybenzoate at 100, 200, 500 or 1000 ⁇ M and they were allowed to proliferate for 48 h. After this time the glioma cell proliferation was evaluated by means of staining the fixed cells with crystal violet. The number of cells is proportional to the amount of retained dye, which was spectrophotometrically determined by measuring the absorbance at 595 nm once the dye was extracted from the cells.
  • the following example shows the efficacy of 2,5-dihydroxycinnamic acid (3-(2,5-dihydroxyphenyl)-2-propenoic acid; 2,5-DHC) to reduce the proliferative capacity of glioma cells and supports the use of the compound in treating gliomas.
  • the cell line used was the C6 cell line and the experiment was carried out as described in Example 2. Once adhered, the cells were treated or not (controls) with increasing concentrations of 2,5-DHC (10, 25, 50 and 100 ⁇ M) and they were allowed to proliferate for 48 h. After this time the glioma cell proliferation was evaluated by means of staining the fixed cells with crystal violet. The number of cells is proportional to the amount of retained dye, which was determined spectrophotometrically by measuring absorbance at 595 nm once the dye was extracted from the cells. The 2,5-DHC, at the concentration of 50 ⁇ M reduced the C6 cell proliferation to less than half, while proliferation was reduced to one tenth in the presence of 100 ⁇ M of 2,5-DHC ( FIG. 3 ).
  • Rat C6 glioma cells were cultured as previously described (Cuevas P et al. Neurol Res, 2005). The C6 cells cultured to confluence in 75 cm 2 flasks were removed and implanted under the abdominal skin in anesthetized rats. The existence of a tumor in the implantation area was observed five days after the implantation of the tumor cells. Only the rats in which the existence of a tumor was observed were randomly assigned to be treated with daily intraperitoneal injections of 2,5-dihydroxybenzene sulfonate (DHBS; 100 mg/kg/day), 2,5-diacetoxybenzene sulfonate (DABS; 100 mg/kg/day) or the carrier (0.9% NaCl).
  • DHBS 2,5-dihydroxybenzene sulfonate
  • DABS 2,5-diacetoxybenzene sulfonate
  • the carrier (0.9% NaCl).
  • the size of the tumors obtained from the rats treated with the carrier was greater than that of those obtained from the rats treated with DHBS or DABS ( FIG. 4 ).
  • the average size of the subcutaneous gliomas obtained from the rats treated with DHBS was less than that of the rats treated with carrier, and this average volume was even less in the rats treated with DABS ( FIG. 5A ).
  • 4 rats were tumor-free when treatment ended.
  • a statistical probability analysis ( ⁇ 2 test) showed that there is a greater probability of being tumor-free in the group treated with DABS than in the group treated with DHBS ( FIG. 5B ).
  • This example demonstrates the inhibitory effect of 2,5-dihydroxybenzene sulfonate on the progression of already established heterotopic gliomas and that the administration of 2,5-acetoxybenzene sulfonate represents a significant advantage over the administration of 2,5-dihydroxybenzene sulfonate on the treatment of these tumors.
  • Tumor cells elude the programmed cell death process or apoptosis that normal cells experience. Apoptosis induction in tumor cells is one way to confront the development of a tumor.
  • DABS potassium 2,5-dihydroxybenzene sulfonate
  • 6 ⁇ m thick sections of the subcutaneous gliomas described in example 4 were made. The sections were stained with hematoxylin and eosin and observed at a magnification of 313 times using immersion oil. In these conditions, cell apoptosis is shown by the existence of apoptotic bodies appearing as strongly chromogenic granules in the cell nucleus which is frequently fragmented. As can be seen in FIG.
  • the presence of tumor cells in the process of apoptosis is very scarce in the gliomas obtained from rats treated only with the carrier.
  • a large number of tumor cells in apoptosis can be observed in the tumors from rats treated with DABS (100 mg/kg/day) for 10 days ( FIG. 6B ).
  • This example shows the treatment capacity of DABS to promote apoptosis in tumor cells of already established subcutaneous gliomas, a property which definitely contributes to the inhibitory effect of treatment with DABS on the growth of these tumors shown in the previous example.
  • the cell lines used were the human prostate cancer PC-3 cells and human lung cancer A549 cells. 2000 cells were seeded per well in 96-well plates and they were allowed to adhere overnight. Then the cells were treated or not (controls) with potassium 2,5-diacetoxybenzene sulfonate (DABS) (1-200 ⁇ M) and they were allowed to proliferate for 96 h. After this time, the PC-3 and A549 cell proliferation was evaluated by determining the final number of cells by means of the viability method of yellow tetrazolium salt (XTT). The data were expressed as a percentage of the control (without treatment). As can be seen in FIG. 7 , DABS caused a significant inhibition of human prostate cancer and lung cancer cell proliferation.
  • XTT yellow tetrazolium salt
  • mice 5 ⁇ 10 6 human prostate cancer PC-3 cells were subcutaneously injected in male athymic mice (Nu/Nu) of 6-8 weeks of age and weighing 20-26 g.
  • DABS potassium 2,5-diacetoxybenzene sulfonate
  • the mice were randomly split into two groups: one of them received a daily injection of potassium 2,5-diacetoxybenzene sulfonate (DABS) by intraperitoneal route at a dose of 100 mg/kg dissolved in saline (0.9% NaCl) whereas the other group received a daily injection of carrier (saline).
  • DABS potassium 2,5-diacetoxybenzene sulfonate
  • carrier saline
  • D the larger diameter in mm
  • d the smaller diameter in mm
  • V the volume in mm3.
  • the mice were sacrificed and the tumors were weighed.
  • FIG. 8A treatment with DABS significantly reduced the human prostate cell tumor growth in athymic mice.
  • This inhibitory effect of DABS on the tumor volume corresponds with a significant reduction of the weight of the extracted tumor when treatment ended in the group treated with DABS ( FIG. 8B ).
  • the 2,5-dihydroxybenzene sulfonate esters described in the present invention are not just prodrugs to finally administer 2,5-dihydroxybenzene sulfonate.
  • the following examples show that these compounds in a completely unexpected manner, have by themselves pharmacological actions of interest in the invention without needing to be converted into 2,5-dihydroxybenzene sulfonate.
  • the following example shows the efficacy of 2,5-dihydroxybenzene sulfonic, potassium 2-acetoxy-5-hydroxybenzene sulfonate (2A-5HBS) and potassium 5-acetoxy-2-hydroxybenzene sulfonate (5A-2HBS) monoesters to reduce the proliferative capacity of glioma cells and supports the use of the compound in treating gliomas.
  • the cell line used was the C6 cell line and the experiment was carried out as described in examples 2 and 3. Once adhered, the cells were treated or not (controls) with (5A-2HBS) (500 ⁇ M) or (2A-5HBS) (500 ⁇ M) and they were allowed to proliferate for 48 h. After this time the glioma cell proliferation was evaluated by means of staining the fixed cells with crystal violet. The number of cells is proportional to the amount of retained dye, which was determined spectrophotometrically by measuring the absorbance at 595 nm once the dye was extracted from the cells.
  • FIGS. 13 , 14 and 15 which show the surface of the dyed protein according to its electrostatic potential (light grey, negative charge; dark grey, positive charge; white, regions with no charge), show the manner in which 2-acetoxy-5-hydroxybenzene sulfonic acid, 5-acetoxy-2-hydroxybenzene sulfonic acid and 2,5-diacetoxybenzene sulfonic acid interact, respectively, with FGF-1.
  • the electron density of the compound, contoured at 1 ⁇ FIGS. 13-15 , panels C), allowed locating and determining the orientations of the compounds with respect to the protein ( FIGS.

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US16/292,906 Abandoned US20190192474A1 (en) 2006-08-16 2019-03-05 Use Of 2,5-Dihydroxybenzene Compounds And Derivatives For The Treatment Of Skin Cancer
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