WO2021201276A1 - Il-23発現を特異的に抑制する二本鎖rnaおよびそれを含む医薬組成物 - Google Patents
Il-23発現を特異的に抑制する二本鎖rnaおよびそれを含む医薬組成物 Download PDFInfo
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- C12N2320/51—Methods for regulating/modulating their activity modulating the chemical stability, e.g. nuclease-resistance
Definitions
- the present invention relates to a double-stranded RNA that specifically suppresses IL-23 expression, and a pharmaceutical composition containing the double-stranded RNA. More specifically, it relates to a siRNA that specifically suppresses IL-23 expression, and a preparation containing the siRNA and an ionic liquid.
- Psoriasis is a local skin disease accompanied by erythema that causes the skin to turn red, fine silver-white scab scales that cover the surface, thickening due to overgrowth of keratinocytes, and inflammation due to infiltration of immune cells.
- psoriasis is classified into multiple types, psoriasis vulgaris, psoriatic arthritis (psoriatic arthritis), psoriasis drip, psoriatic erythema and pustular psoriasis.
- steroidal or non-steroidal anti-inflammatory drugs were often used to relieve symptoms.
- long-term treatment with such agents leads to chronic inflammation and side effects, such as gastric ulcers caused by non-steroidal anti-inflammatory drugs, and thus can be safely used as a therapeutic agent for psoriasis.
- Development is wished.
- Patent Document 1 describes that modulating Th17T cell differentiation is useful in the treatment of autoimmune diseases and / or inflammatory disorders, and shows the association between IL-23 and those diseases. I have.
- IL-23 may be useful in the treatment of the onset and progression of various diseases such as psoriasis, and thus IL-23 has become a new target for the treatment of various diseases such as psoriasis.
- Patent Documents 2 and 3 the development of a monoclonal antibody that specifically inhibits p19, which is a subunit protein of IL-23, has progressed (Patent Documents 2 and 3), and Tremfia, a human anti-human IL-23p19 monoclonal antibody preparation as a therapeutic agent for psoriasis. (Registered trademark) is approved.
- siRNA is a double-stranded RNA consisting of about 21 to 23 base pairs (molecular weight of about 13300), and specific gene expression can be suppressed by specifically cleaving the mRNA of the target protein, and the gene can be used as the gene. It is expected to bring about a high therapeutic effect on related diseases. Further, siRNA has an advantage that it can be produced relatively easily and inexpensively as compared with an antibody drug because it can be produced by a chemical synthesis technique like a low molecular weight compound.
- Non-Patent Document 2 The existence of siRNA that suppresses the expression of IL-23 has already been reported (Non-Patent Document 2). However, the type of psoriasis is an embodiment, and more effective siRNA is required so that a therapeutic agent can be appropriately selected accordingly.
- siRNA is a water-soluble polymer, it is very difficult to deliver it into the skin by passive diffusion by simple application, and it is easily hydrolyzed by nuclease, which is a nucleic acid hydrolase existing inside and outside cells. Since it is cleaved and cleaved, there is a problem that the expression of the gene cannot be suppressed in vivo, and it has been considered extremely difficult to use it as a preparation other than an injection. In fact, a preparation for transdermal administration using siRNA has not yet been put on the market.
- the present invention finds a novel double-stranded RNA that specifically suppresses IL-23 expression, overcomes the problems of low cell membrane permeability and undergoes degradation by nucleases, and is a clinically applicable siRNA-containing preparation.
- the present inventors have found that a specific siRNA targeting the mRNA of the p19 subunit of IL-23 effectively suppresses IL-23 expression in cells. We also found that it improves psoriasis symptoms in psoriasis model mice. Furthermore, they have found that the use of an aliphatic carboxylic acid-based ionic liquid improves the stability of siRNA and the permeability of siRNA into the skin, and has completed the present invention.
- a double-stranded RNA comprising the indicated base sequence and its complementary base sequence.
- Item 2 according to Item 1 or Item 2, wherein one or more nucleotides in the chain of each chain are chemically modified, or the nucleotides at the 5'end or 3'end of each chain are chemically modified.
- Positive-strand RNA [Item 4] The two items according to Item 3, wherein the chemical modification is selected from the group consisting of phosphorothioate modification, 2'-F modification, 2'-OMe modification, 2'-MOE modification, LNA modification and ENA modification. Strand RNA.
- Item 5 The double-stranded RNA according to any one of Items 1 to 4, wherein 1 to 10 deoxyribonucleotides are bound to the 3'end of the sense strand and the 5'end of the antisense strand.
- Item 6 The double-stranded RNA according to Item 5, wherein two thymidines (dT) are bound to the 3'end of the sense strand and the 5'end of the antisense strand.
- Item 7 The double-stranded RNA according to any one of Items 1 to 6, for specifically suppressing IL-23 expression.
- Item 8 A pharmaceutical composition containing the double-stranded RNA according to any one of Items 1 to 7.
- the fatty acid-based mixed ionic liquid is a) A type or more of an aliphatic carboxylic acid-based ionic liquid having 2 to 7 carbon atoms composed of a lower aliphatic carboxylic acid having 2 to 7 carbon atoms and any one of ethanolamine, diethanolamine, and triethanolamine.
- RNA is an aliphatic carboxylic acid-based ionic liquid having 2 to 20 carbon atoms having a solubility of 1 w / w% or less.
- RNA is an aliphatic carboxylic acid-based ionic liquid having 2 to 20 carbon atoms having a solubility of 1 w / w% or less.
- Item 14 The pharmaceutical composition according to Item 13, wherein the disease is psoriasis.
- the present invention also provides the following aspects.
- a method for treating a disease caused by IL-23 expression which comprises administering the double-stranded RNA according to any one of Items 1 to 6 to a patient in need of treatment.
- Item 16. The treatment method according to Item 15, wherein the disease is psoriasis.
- Item 20 The double-stranded RNA according to Item 19, wherein the disease is psoriasis.
- Item 21 Below: (1) A step of mixing an aliphatic carboxylic acid and an organic amine to obtain an ionic liquid; (2) A step of dissolving the double-stranded RNA according to any one of Items 1 to 6 in the ionic liquid obtained in (1) to obtain a double-stranded RNA-containing ionic liquid solution; (3) A method for producing a double-stranded RNA-containing transdermal administration preparation, which comprises a step of mixing the double-stranded RNA-containing ionic liquid solution obtained in (2) with a separately prepared ionic liquid to obtain a main drug solution. ..
- Item 23 A cell containing the expression vector according to Item 22.
- the double-stranded RNA of the present invention can specifically suppress the expression of IL-23, and may be useful for the treatment of diseases caused by IL-23 expression such as psoriasis.
- the pharmaceutical composition of the present invention can achieve high stability and skin permeability of double-stranded RNA by using an ionic liquid, and can efficiently deliver double-stranded RNA, which is an active ingredient, to the affected area. It can be used as a preparation for percutaneous absorption. Since the double-stranded RNA of the present invention is highly stable in a pharmaceutical product, it can be used at a low dose and is expected as a safe and economical therapeutic agent for psoriasis.
- FIG. 1 shows the results of Western blotting of controls (Control, LPS, LPS + GFP siRNA) and siRNAs of the present invention (LPS + siRNA (No. 1) to siRNA (No. 5)) in a cell solution supplemented with LPS only.
- the ratio of the IL-23 expression level in Control, GFP siRNA and siRNA (No. 1) to siRNA (No. 5) when the IL-23 expression level is 1 is shown.
- FIG. 2 shows images of fluorescently labeled siRNA in the absence and presence of ionic liquids in normal mice and psoriasis model mice and overlay images of the images with brightfield images of skin tissue.
- FIG. 3 shows images of HE staining of skin tissue of normal mice and mild psoriasis model mice of each group and the thickness ( ⁇ m) of the epidermis of each mouse.
- FIG. 4 shows images of Ki-67 immunostaining of skin tissue of normal mice and mild psoriasis model mice of each group.
- FIG. 5 shows images of HE staining of skin tissue of normal mice and severe psoriasis model mice of each group and the thickness ( ⁇ m) of the epidermis of each mouse.
- FIG. 6 shows images of Ki-67 immunostaining of skin tissue of normal mice and severe psoriasis model mice of each group.
- FIG. 7 shows the results of Western blots of the untreated group, the GFP siRNA treated group and the IL-23 siRNA treated group in the severe psoriasis model mouse, and the expression level of IL-23 in the skin tissue of each group.
- FIG. 8 shows the CD spectra of siRNA dissolved in an ionic liquid (IL), siRNA dissolved in water, and an ionic liquid (IL).
- FIG. 9 shows the results of agarose gel electrophoresis of siRNA dissolved in a diluting solvent (Tris-EDTA (TE), HEPES buffer (HBS), RPMI1640 medium or ionic liquid (IL)).
- Tris-EDTA TE
- HBS HEPES buffer
- RPMI1640 RPMI1640 medium or ionic liquid (IL)
- the present invention includes double-stranded RNA that specifically suppresses the expression of IL-23, and said double-stranded RNA for treating diseases caused by IL-23 expression, such as skin diseases (eg, psoriasis). It provides a pharmaceutical composition.
- double-stranded RNA refers to a double-stranded nucleic acid molecule in which a target base sequence and an RNA chain having a base sequence complementary thereto are bound in opposite directions. Examples thereof include, but are not limited to, siRNA, shRNA, miRNA, and the like.
- the double-stranded RNA of the present invention is preferably siRNA.
- the double-stranded RNA of the present invention is obtained by hybridizing an antisense strand complementary to the target sequence of mRNA of the p19 subunit of IL-23 and a sense strand complementary to the antisense strand. It has an action of cleaving target RNA (RNA interference action) and a function of suppressing the expression of IL-23.
- RNA interference action RNA interference action
- the lengths of the sense strand and antisense strand of the double-stranded RNA of the present invention may be the same or different. Its length is 19-30 nucleotides, preferably 19-25 nucleotides, more preferably 19-23 nucleotides, still more preferably 19-21 nucleotides or 19 nucleotides.
- one or more nucleotides in each strand may be chemically modified, and the 5'end or 3'end of each strand may be chemically modified.
- Chemical modification imparts resistance to nuclease, which is a nucleic acid hydrolase, and improves stability in vivo and the like. Examples of chemical modifications include, but are not limited to, phosphorothioate modification, 2'-F modification, 2'-OMe modification, 2'-MOE modification, LNA modification, ENA modification, and the like.
- the method of applying the chemical modification is not particularly limited, but a known method can be used.
- Both ends of the sense strand and antisense strand of the double-stranded RNA of the present invention may be blunt ends or overhangs.
- each strand of the double-stranded RNA of the present invention is 1 to 10 nucleotides, preferably 1 to 5 nucleotides, and more preferably 1 to 2 nucleotides.
- the length of the protruding end of each chain may be the same or different.
- the nucleotide at the protruding end portion may be a deoxyribonucleotide.
- the double-stranded RNA of the present invention preferably contains two thymidines (dT) at the 3'end of the sense strand and the 5'end of the antisense strand.
- the double-stranded RNA of the present invention forms a loop structure with several nucleotides at the 3'end of the sense strand and the 5'end of the antisense strand or the 5'end of the sense strand and the 3'end of the antisense strand. May be good.
- Examples of the double-stranded RNA having a loop structure include siRNA in which 2 nucleotides at the 3'end of the sense strand and 2 nucleotides at the 5'end of the antisense strand form a loop.
- the double-stranded RNA of the present invention may have at least one mismatch as long as the antisense strand of the double-stranded RNA of the present invention hybridizes with the target sequence to bring about an IL-23 expression inhibitory effect. ..
- the double-stranded RNA of the present invention has one substituted base.
- the double-stranded RNA of the present invention is preferably a siRNA formed from the sense sequence and antisense sequence shown in (1) to (5) in the table below.
- the siRNAs to which two thymidines (dT) are bound to the 3'end of the sense strand and the 5'end of the antisense strand of the siRNAs (No. 1) to (No. 5) are as follows. be.
- the double-stranded RNA of the present invention can be produced by a known production method, for example, chemical synthesis in vitro.
- chemical synthesis can be carried out by a nucleic acid synthesizer using an amidide resin containing a nucleic acid molecule which is a double-stranded RNA component as a raw material.
- the double-stranded RNA of the present invention reduces the expression level of IL-23 in dendritic cells, and further improves the skin symptoms of psoriasis such as reduction of epidermal thickening and suppression of keratinocyte proliferation in the skin of psoriasis model mice. Demonstrate. Therefore, the double-stranded RNA of the present invention can be useful as a pharmaceutical composition (pharmaceutical).
- the pharmaceutical composition of the present invention contains double-stranded RNA.
- a preferred embodiment is a pharmaceutical composition containing double-stranded RNA and an aliphatic carboxylic acid ionic liquid, and a more preferred embodiment is an external preparation containing double-stranded RNA and an aliphatic carboxylic acid ionic liquid. be.
- the "aliphatic carboxylic acid-based ionic liquid” refers to a room temperature viscous liquid blended salt formed from an aliphatic carboxylic acid and an organic cation and having a melting point of 100 ° C. or lower.
- Aliphatic carboxylic acid-based ionic liquids can be prepared by mixing an aliphatic carboxylic acid and an organic cation in an equimolar amount or an excess amount at room temperature or under heating. The excess amount of the aliphatic carboxylic acid and / or the organic cation is preferably within 0.2 times the molar amount.
- the aliphatic carboxylic acid-based ionic liquid of the present invention can also be formed from an aliphatic carboxylic acid and an agent having an amine structure.
- the "aliphatic carboxylic acid” refers to a carboxylic acid having one or more carboxyl groups.
- the carbon chain in the aliphatic carboxylic acid may be linear or branched, and may be saturated or unsaturated. Further, it may have a substituent other than the carboxyl group, and the number and types of the substituents are not particularly limited. Examples of the substituent include an amino group, a hydroxyl group and the like. Examples of the aliphatic carboxylic acid include an aliphatic carboxylic acid having 2 to 20 carbon atoms.
- Examples of the aliphatic carboxylic acid having 2 to 20 carbon atoms include lower fatty acids having 2 to 7 carbon atoms and keto acids, intermediate fatty acids having 8 to 12 carbon atoms and higher fatty acids having 13 to 20 carbon atoms.
- Examples of the aliphatic carboxylic acid of the present invention include glycolic acid, methoxyacetic acid, levulinic acid, hexanoic acid, 2-ethylhexanoic acid, octanoic acid, decanoic acid, lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid, Examples include oleic acid. Among them, levulinic acid and isostearic acid are preferable.
- the "organic cation” is a cationic organic compound, and examples thereof include an organic amine, an organic quaternary ammonium cation, and an organic quaternary phosphonium cation.
- examples of the organic amine include organic amines having 4 to 12 carbon atoms, and ethanolamine, diethanolamine, triethanolamine, isopropanolamine, diisopropanolamine and triisopropanolamine are preferable.
- the pharmaceutical composition of the present invention may contain a double-stranded RNA and an aliphatic carboxylic acid-based mixed ionic liquid.
- the "aliphatic carboxylic acid-based mixed ion liquid” is a mixture of two or more of the above-mentioned aliphatic carboxylic acid-based ion liquids (for example, an aliphatic carboxylic acid-based ion liquid having 2 to 20 carbon atoms).
- Those having a common aliphatic carboxylic acid but different organic cations include a) one or more of a lower aliphatic carboxylic acid having 2 to 7 carbon atoms and an aliphatic carboxylic acid ionic liquid having 2 to 7 carbon atoms consisting of either ethanolamine, diethanolamine or triethanolamine.
- an aliphatic carboxylic acid mixed ionic liquid consisting of an aliphatic carboxylic acid ionic liquid having 2 to 20 carbon atoms having a solubility of double-stranded RNA of 1 w / w% or less, and the aliphatic carboxylic acid ionic liquid.
- an aliphatic carboxylic acid-based mixed ionic liquid which is dissolved in an aliphatic carboxylic acid-based ionic liquid and contains an organic solvent having a solubility of double-stranded RNA of 1 w / w% or less can be mentioned.
- the "lower aliphatic carboxylic acid-based ionic liquid having 2 to 7 carbon atoms” refers to a lower aliphatic carboxylic acid having 2 to 7 carbon atoms and three kinds of organic amines of ethanolamine, diethanolamine, and triethanolamine. An equimolar molten salt or an equimolar equilibrium mixture with any of them.
- the aliphatic carboxylic acid and / or the above-mentioned organic amine may be added in an excessive amount in consideration of the concentration of the double-stranded RNA used and the influence of the additive. The excess amount thereof is preferably within 0.2 times the molar amount.
- the aliphatic carboxylic acid-based ionic liquid having 2 to 7 carbon atoms may be used alone or as a mixed ionic liquid of two or more kinds (including an ionic liquid when only the organic amine compound is different). ..
- the aliphatic carboxylic acid-based ionic liquid having 2 to 7 carbon atoms is preferably a diethanolamine salt of glycolic acid, a triethanolamine salt of glycolic acid, a diethanolamine salt of methoxyacetic acid, a triethanolamine salt of methoxyacetic acid, or a diethanolamine of levulinic acid. It is a salt or a triethanolamine salt of levulinic acid, more preferably a diethanolamine salt of levulinic acid or a triethanolamine salt of levulinic acid.
- An "aliphatic carboxylic acid mixed ionic liquid" obtained by diluting an aliphatic carboxylic acid fatty acid ionic liquid having 2 to 7 carbon atoms is necessary for dissolving double-stranded RNA and maintaining appropriate solubility. Can be used in quantity. The amount used depends on the amount of double-stranded RNA in the preparation, but is preferably 0.1 to 30 w / w%, and more preferably 0.1 to 10 w / w%.
- the "aliphatic carboxylic acid-based ionic liquid having 2 to 20 carbon atoms" is an equimolar molten salt of an aliphatic carboxylic acid having 2 to 20 carbon atoms and an organic amine having 4 to 12 carbon atoms.
- the aliphatic carboxylic acid and / or the above-mentioned organic amine may be added in an excessive amount in consideration of the concentration of the double-stranded RNA used and the influence of the additive. The excess amount thereof is preferably within 0.2 times the molar amount.
- the aliphatic carboxylic acid-based ionic liquid may be a salt of ethanolamine, diethanolamine, triethanolamine, isopropanolamine, diisopropanolamine or triisopropanolamine. preferable. More preferably, it is a diisopropanolamine salt of decanoic acid and a triisopropanolamine salt of decanoic acid.
- the aliphatic carboxylic acid-based ionic liquid is preferably a salt with an organic amine similar to that of the intermediate fatty acid. More preferably, it is a diisopropanolamine salt of isostearic acid and a triisopropanolamine salt of isostearic acid.
- an expression vector capable of expressing the double-stranded RNA in the administration subject or a cell containing the expression vector may be used.
- the pharmaceutical composition of the present invention can treat and / or prevent a disease caused by IL-23 expression.
- disease caused by IL-23 expression refers to psoriasis, rheumatoid arthritis, osteoarthritis, reactive arthritis, psoriatic arthritis, bone loss, airway hyperresponsiveness, chronic obstructive pulmonary disease, demyelination disorder, etc.
- sclerosis multiple sclerosis, skin hypersensitivity, acute transplant rejection, chronic transplant rejection, allogeneic transplant rejection, implant-to-host disease, systemic sclerosis, systemic erythematosus, autoimmune inflammatory bowel disease, urinary inflammatory disease , Cardiovascular disease, vasculitis, periodic fever, glucose metabolism disorder, lung disease, cancer, periodontitis, herpes interstitial keratitis, allergies, inflammatory pain, spondyloarthropathies, septicemia, septic shock or internal Toxic shock, meningitis, surgical trauma, autoimmune blood disorders, Alzheimer's disease, sarcoidosis, liver cirrhosis, hepatitis (including autoimmune hepatitis), primary biliary cirrhosis, vegetation, thyroiditis, Atherosclerosis, alopecia, Wilson's disease, glomerular nephritis, and dyslipidemia. Among them, psoriasis is preferable.
- treatment means any treatment of diseases caused by IL-23 expression or symptoms associated therewith, such as curing or ameliorating psoriasis, alleviating or suppressing symptoms associated with psoriasis. It also includes prevention of recurrence of diseases such as psoriasis.
- prevention means preventing the onset of a disease caused by IL-23 expression, delaying the onset of a disease, and reducing the risk of developing a disease.
- the "patient” refers to humans and animals, such as dogs, cats, and horses. Among them, human is preferable.
- the "therapeutically effective amount” is an amount that brings about a therapeutic effect on a disease caused by IL-23 expression and the symptoms associated therewith, or an amount that causes a delay in the progression of the disease, as compared with an untreated patient. To say.
- the term also includes, within that range, an amount effective in promoting normal physiological function.
- Such effective amounts include the amount of double-stranded RNA of the present invention alone, the amount of combination of double-stranded RNA of the present invention, and other active ingredients useful in the treatment of diseases caused by IL-23 expression such as psoriasis.
- the amount of double-stranded RNA of the present invention can be mentioned.
- the pharmaceutical composition of the present invention may contain a pharmaceutically acceptable active ingredient other than double-stranded RNA.
- the pharmaceutical composition of the present invention may contain commonly used known additives such as antioxidants, preservatives, thickeners and preservatives. Each of these additives may be used alone, or two or more thereof may be used in combination in an appropriate amount.
- antioxidants examples include ascorbic acid, sodium hydrogen sulfite, sodium sulfite, erythorbic acid, tocopherol acetate, dibutylhydroxytoluene, tocopherol, sodium pyrosulfite, butylhydroxyanisole, and propyl gallate. Among them, sodium bisulfite and propyl gallate are preferable.
- the content of the antioxidant in the pharmaceutical composition of the present invention can be appropriately adjusted depending on the type of the antioxidant and the like, but is, for example, 0.001 to 5 w / w%, preferably 0.003 to 2 w / w. It is w%, more preferably 0.005 to 1 w / w%. Moreover, you may use 1 type or 2 or more types of antioxidants together.
- preservatives include benzoic acid, sodium benzoate, sorbic acid, sodium sorbate, sodium dehydroacetate, paraoxybenzoic acid, sodium paraoxybenzoate, ethyl paraoxybenzoate, propyl paraoxybenzoate (propylparaben), paraoxybenzoic acid.
- examples thereof include butyl, isopropyl paraoxybenzoate, isobutyl paraoxybenzoate, propionic acid, sodium propionate, benzalkonium chloride, and salicylic acid.
- methylparaben, propylparaben, benzalkonium chloride, salicylic acid or a mixture thereof is preferable.
- the content of the preservative in the pharmaceutical composition of the present invention can be appropriately adjusted depending on the type of the preservative and the like, and is, for example, 0.01 to 0.5 w / w%, preferably 0.02 to 0. It is 3 w / w%, more preferably 0.03 to 0.2 w / w%.
- one kind or two or more kinds of preservatives may be used together.
- the thickener includes an inorganic material and an organic material, and examples of the inorganic material include amorphous silicon dioxide, kaolin (plaster), diatomaceous earth, talc, hydrous silicon dioxide, light anhydrous silicic acid, magnesium silicate, and calcium silicate. , Calcium phosphate, barium sulfate, and examples of the organic material include crystalline cellulose. Among them, light silicic anhydride is preferable.
- the content of the thickener in the pharmaceutical composition of the present invention can be appropriately adjusted depending on the type of thickener and the like, but is, for example, 0.01 to 10 w / w%, preferably 0.05 to 5 w / w. It is w%, more preferably 0.1 to 1 w / w%. Further, the thickener may be used alone or in combination of two or more.
- the chelating agent is preferably a chelating agent used for removing divalent metal ions such as Zn in order to suppress the activity of DNA degrading enzymes existing on the skin surface, and a chelate having less skin irritation.
- the agent is more preferred.
- the preservative include acetylacetate esters such as edetonic acid disodium salt (EDTA.2Na), acetylacetate methyl ester, and acetylacetate ethyl ester. Of these, EDTA ⁇ 2Na is preferable.
- the content of the preservative in the pharmaceutical composition of the present invention can be appropriately adjusted depending on the type of the preservative and the like, but is, for example, 0.05 to 5 w / w%, preferably 0.03 to 3 w / w%. It is more preferably 0.01 to 2 w / w%. Moreover, you may use 1 type or 2 or more types of preservatives together.
- the pharmaceutical composition of the present invention is suitable for parenteral (for example, transdermal) administration.
- Parenteral administration of the pharmaceutical composition of the present invention includes transdermal administration, intestinal administration (eg, intrarectal transport, intranasal transport), intravascular administration (eg, intravenous bolus injection, intravenous injection, intraarterial bolus). Injection, intraarterial infusion, catheter infusion into the vascular system), peri-tissue and intra-tissue administration, subcutaneous administration, inhalation administration.
- transdermal administration is preferable.
- the pharmaceutical composition of the present invention can also be orally administered.
- the content of the double-stranded RNA of the present invention in the pharmaceutical composition for transdermal administration is not particularly limited as long as it is absorbed transdermally and reaches a therapeutically effective amount. Its content is, for example, 0.01 to 5 w / w%, preferably 0.02 to 1 w / w%.
- the dosage form of the pharmaceutical composition of the present invention can be appropriately prepared according to the physical condition, health condition, etc. of the patient.
- oral administrations such as tablets, capsules, granules, powders, liquids, syrups, or injections, external preparations, inhalants, suppositories, eye drops, eye ointments, ear drops, nasal drops, etc.
- a parenteral preparation such as an external preparation, a spray preparation, an ointment preparation, a cream preparation, a gel preparation, or a patch.
- the pharmaceutical composition of the present invention dissolves or mixes an aliphatic carboxylic acid-based mixed ion liquid in which a double-stranded RNA, which is a medicinal ingredient, is dissolved in the base of the preparation. It can be dispersed, suspended and prepared as an external preparation.
- the base of the external preparation include bases used for ointments, liquids, patches and the like.
- the base of the ointment include white petrolatum, liquid paraffin, gelled hydrocarbon and the like.
- the gelled hydrocarbon is a gelled hydrocarbon such as liquid paraffin, paraffin, isoparaffin, squalane, squalene, and polybutene.
- liquid paraffin gelled with polyethylene resin and fats and oils gelled with rubber / elastomer are preferable.
- the base of the liquid preparation include a mixed solution of alcohols such as isopropanol, ethanol, propylene glycol and glycerin and fats and oils such as olive oil and soybean oil.
- the base of the patch include an adhesive.
- the pressure-sensitive adhesive as the base of the patch is mainly composed of an elastomer, a pressure-sensitive adhesive, a softener, a filler, an antioxidant and the like. It should be noted that the softener, filler and antioxidant may not be contained.
- the amount used varies depending on the patient's symptoms, age, etc., but in general, it is preferably applied once to several times a day to adults. .. Further, the external preparation of the present invention is more preferably applied once or twice a day, but the number of administrations may be increased depending on the symptom.
- Example 1 In vitro evaluation of IL-23 expression-suppressing effect of siRNA (1) Preparation of siRNA Using the nucleotide sequence shown in SEQ ID NO: 1, GC Score (containing the GC base of siRNA) was used by sequence design software (SISNIPER). Rate), Load Score (bias of siRNA internal energy), Position Score (position in target mRNA), Specificity Score (sequence specificity in genome), Profile Score (sequence characteristics common to active siRNA) Comparison) was calculated, and the total score was calculated based on this. Five target sequences capable of suppressing the expression of IL-23 having a total score of 81.0 or higher are selected, siRNA (No. 1) to siRNA (No.
- siRNAs (No. 1) to (No. 5) are double-stranded RNAs having sequences represented by SEQ ID NOs: 2 to 6 and target sequences which are complementary sequences thereof, respectively.
- SEQ ID NO: 1 is the nucleotide sequence of the mRNA of the p19 subunit of hedgehog-derived IL-23, which has a total length of 1358 nucleotides, and the sequence information is registered in GenBank as GenBank Accession No. AF301619.
- IL-23 expression-suppressing effect of the five prepared siRNAs (No. 1) to (No. 5) was evaluated. Specifically, after culturing JAWSII cells (2 ⁇ 10 6 cells / mL), which is a dendritic cell line, for 24 hours under the conditions of 37 ° C. and 5% CO 2 , 5 types of siRNA are used as transfection reagents, Lipofectamine. Was introduced into cells using (30 pmol / mL). After 24 hours, LPS was added (100 ng / mL), and after an additional 6 hours, cells were collected and lysed. IL-23 in cell lysate was evaluated by Western blot.
- a cell solution without siRNA and LPS As controls, a cell solution without siRNA and LPS, a cell solution with LPS only, and a cell solution with siRNA against GFP, which is a siRNA that does not suppress the expression of IL-23 (hereinafter, also referred to as GFP siRNA) and LPS, are used. board.
- FIG. 1 shows that the addition of LPS increases the expression level of IL-23, and the addition of siRNA of the present invention decreases the expression level of IL-23. It was observed that siRNA (No. 2) most reduced the expression level of IL-23. Therefore, siRNA (No. 2) was used as a test siRNA in the following tests.
- Example 2 In vivo skin permeability test of siRNA-containing preparation (1) Preparation of siRNA-containing preparation Each component was weighed according to the content shown in Table 3 below, and the siRNA-containing preparation was prepared according to the following production method.
- An ionic liquid (hereinafter referred to as ionic liquid A) is prepared by mixing levulinic acid and triethanolamine, sodium hydrogen sulfite and propyl gallate are added to the prepared ionic liquid A, and the mixture is dissolved at 60 ° C. to further add siRNA. It was added and dissolved at 60 ° C. to prepare a siRNA-containing ionic liquid A solution.
- ionic liquid B an ionic liquid
- siRNA-containing ionic liquid A solution and the ionic liquid B were mixed, and the obtained solution was used as the main drug solution.
- the main drug solution, sodium edetate, light anhydrous silicic acid and gelled hydrocarbon were mixed to obtain an ointment preparation.
- mice were prepared using the mouse according to the method described in J. Control. Release, 2017, 246, 120-132. Specifically, the back of a 5-week-old male C57BL / 6N mouse (source: Nippon SLC, weight: about 20 g) was shaved, and Imikimodo cream (Versena cream 5%, Mochida Pharmaceutical Co., Ltd.) was applied to the back. In mice in which psoriasis symptoms were induced by applying 60 mg once a day for 4 days, erythema associated with skin inflammation, thickening due to hyperproliferation of keratinocytes, and an increase in the expression level of IL-23 were observed. Since these symptoms are consistent with those of psoriasis, it was shown that they can be used as psoriasis model mice.
- siRNA-containing preparation prepared in (1) fluorescently labeled with FAM ( The test product) was applied to the back of the mouse to perform a skin permeability test.
- FAM The test product
- test preparation and the control preparation were applied to the shaved back of normal mice (C57BL / 6N mice) and psoriasis model mice, and 6 hours after application, the skin at the application site of each mouse was collected to prepare frozen sections by a conventional method. Then, the distribution of fluorescently labeled siRNA in the skin tissue was observed with a fluorescence microscope.
- Example 3 Drug efficacy test of siRNA-containing preparation in mild psoriasis model mouse
- the therapeutic effect of siRNA of the present invention on psoriasis was evaluated using the mild psoriasis model mouse.
- imiquimod cream Mochida Pharmaceutical Co., Ltd.
- Example 2 (1) Example 3
- Treatment was performed by applying 100 mg of the prepared siRNA-containing preparation or commercially available tacrolimus ointment 0.1% (Polapharma) once a day for 3 days, and on the 8th day, the skin was collected to collect the siRNA treatment group and tacrolimus. Frozen sections of the treatment group were prepared. In addition, the application site of the mouse was not treated from the 5th day, and the skin was collected on the 8th day to prepare a frozen section of the untreated group. The sections were stained with HE and immunostained with Ki-67, a cell proliferation marker, to evaluate the degree of epidermal thickening and the degree of skin overgrowth. The untreated group and the tacrolimus-treated group were used as controls. In addition, the degree of epidermal thickening and the degree of skin overgrowth were compared with the skin of normal mice.
- FIG. 1 The images of HE staining of the skin tissue of normal mice and mild psoriasis model mice (untreated group, siRNA treated group and tacrolimus treated group) and the thickness ( ⁇ m) of the epidermis of each mouse are shown in FIG.
- Treatment with siRNA and tacrolimus improved skin symptoms in all mice and recovered to the same extent as the skin of normal mice. No difference was found between the siRNA and tacrolimus treatment groups.
- the siRNA preparation of the present invention has the same therapeutic effect as the existing therapeutic agent for psoriasis. Furthermore, it has been shown that the siRNA-containing preparation of the present invention has excellent skin permeability and can be useful as a preparation for transdermal administration.
- Example 4 Drug efficacy test of siRNA-containing preparation in severe psoriasis model mouse
- the therapeutic effect of siRNA of the present invention on psoriasis was evaluated using the severe psoriasis model mouse.
- C57BL / 6N mice (15) were randomly classified into an untreated group, a siRNA (IL-23 siRNA and GFP siRNA) treated group, a tachlorimus treated group, and a normal mouse group in psoriasis model mice (each group).
- n 3
- the imikimod cream was continuously applied to the shaved back of the mouse for 7 days, and from the 5th day onward, in Example 2 (1).
- 100 mg of the prepared siRNA-containing preparation, commercially available tacrolimus ointment or GFP siRNA is applied once a day for 3 days for treatment, and the skin is collected on the 8th day to collect IL-23 siRNA treatment group and tacrolimus treatment group.
- frozen sections of the GFP siRNA treatment group were prepared.
- the application site of the mouse was not treated from the 5th day, and the skin was collected on the 8th day to prepare a frozen section of the untreated group.
- the sections were stained with HE and immunostained with Ki-67, a cell proliferation marker, to evaluate the degree of epidermal thickening and the degree of skin overgrowth.
- the untreated group, tacrolimus-treated group, and GFP siRNA-treated group were used as controls.
- the degree of epidermal thickening and the degree of skin overgrowth were compared with the skin of normal mice.
- FIG. 6 HE-stained images of skin tissue of normal mice and model mice with severe psoriasis (untreated group, GFP siRNA treated group, IL-23 siRNA treated group and tachlorimus treated group) and the skin thickness ( ⁇ m) of each mouse are shown in FIG.
- the images of Ki-67 immunostaining of the skin tissue of normal mice and severe psoriasis model mice in each group are shown in FIG. 6, and the untreated group, GFP siRNA treatment group and IL-23 siRNA treatment group in severe psoriasis model mice are shown in FIG.
- the results of Western blot and the expression level of IL-23 in the skin tissue of each group are shown in FIG. In FIGS.
- the siRNA of the present invention has been shown to exert a therapeutic effect even in severe psoriasis symptoms. Further, in FIG. 7, it was shown that the siRNA of the present invention causes a decrease in epidermal thickening, suppression of keratinocyte proliferation, and a decrease in the expression level of IL-23, but these effects were observed in the treatment of GFP siRNA. I could't. From the results of this study, it was shown that the siRNA preparation of the present invention exerts a therapeutic effect even in severe psoriasis symptoms, and the therapeutic effect is mediated by the specific suppression of IL-23. It was shown to be possible.
- Example 5 Stabilization test of siRNA with ionic liquid The stabilizing action of siRNA with ionic liquid was evaluated. Specifically, siRNA (No. 2) (0.02 w / w%) was dissolved in an ionic liquid component (levulinic acid, triethanolamine, isostearic acid, diisopropanolamine) having the contents shown in Table 3 above, and the solution thereof was dissolved. The CD spectrum of the siRNA solution obtained by diluting with solution water was measured with a circular dichroic dispersometer J-1500 (JASCO Corporation). As a control, a siRNA solution dissolved in water and a mixture of the above ionic liquid component and water were used.
- siRNA 0.02 w / w%
- siRNA dissolved in an ionic liquid component prepared in the same manner as above and fetal bovine serum (Sigma) were mixed at a volume ratio of 1: 1 and incubated at 37 ° C. for 30 minutes, and then subjected to agarose gel electrophoresis. Degradation of siRNA was confirmed and the stability of siRNA was evaluated. In addition, the stability of siRNA was evaluated even in the absence of serum.
- siRNA diluted with Tris-EDTA buffer (TE), HEPES buffer (HBS), or RPMI1640 medium (Fujifilm Wako Pure Chemical Industries, Ltd.) was used.
- the CD spectra of siRNA, siRNA and the ionic liquid dissolved in the ionic liquid are shown in FIG. 8, and the results of agarose gel electrophoresis of the siRNA dissolved in the diluting solvent (TE, HBS, RPMI1640 medium or the ionic liquid (IL)) are shown in FIG. Shown in. It has been shown that lysing the siRNA in an ionic liquid stabilizes the association between the double strands of the siRNA. It was also shown that when siRNA is dissolved in a solvent other than an ionic liquid, siRNA is degraded in the serum, but when dissolved in an ionic liquid, the degradation of siRNA is suppressed. From the results of this test, it was shown that the ionic liquid contributes to the improvement of the stability of siRNA.
- the double-stranded RNA of the present invention can specifically suppress the expression of IL-23, and may be useful for the treatment of diseases caused by IL-23 expression such as psoriasis.
- the pharmaceutical composition of the present invention can achieve high stability and skin permeability of double-stranded RNA by using an ionic liquid, and can efficiently deliver double-stranded RNA, which is an active ingredient, to the affected area. It can be used as a preparation for percutaneous absorption. Since the double-stranded RNA of the present invention is highly stable in a pharmaceutical product, it can be used at a low dose and is expected as a safe and economical therapeutic agent for psoriasis.
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Abstract
Description
特許文献1には、Th17T細胞分化をモジュレートすることは自己免疫疾患および/または炎症障害の治療に有用であることが記載されており、IL-23とそれらの疾患との関連性が示されています。
[項1] センス鎖およびアンチセンス鎖を含む二本鎖RNAであって、各鎖が19~30ヌクレオチドからなり、配列番号2、配列番号3、配列番号4、配列番号5または配列番号6で示される塩基配列およびその相補的な塩基配列を含む、二本鎖RNA。
[項2] 各鎖が、19~25ヌクレオチドからなる、項1に記載の二本鎖RNA。
[項3] 各鎖の鎖内の1つ以上のヌクレオチドが化学修飾されているかまたは各鎖の5’末端もしくは3’末端のヌクレオチドが化学修飾されている、項1または項2に記載の二本鎖RNA。
[項4] 該化学修飾が、ホスホロチオエート修飾、2’-F修飾、2’-OMe修飾、2’-MOE修飾、LNA修飾およびENA修飾からなる群から選択される、項3に記載の二本鎖RNA。
[項5] センス鎖の3’末端およびアンチセンス鎖の5’末端に1~10デオキシリボヌクレオチドが結合している、項1~項4のいずれかに記載の二本鎖RNA。
[項6] センス鎖の3’末端およびアンチセンス鎖の5’末端に2個のチミジン(dT)が結合している、項5に記載の二本鎖RNA。
[項7] IL-23発現を特異的に抑制するための、項1~項6のいずれかに記載の二本鎖RNA。
[項8] 項1~項7のいずれかに記載の二本鎖RNAを含む医薬組成物。
[項9] さらに脂肪族カルボン酸系イオン液体を含む、項8に記載の医薬組成物。
[項10] 該脂肪族カルボン酸系イオン液体が、2種以上の脂肪族カルボン酸系イオン液体を含む脂肪族カルボン酸系混合イオン液体である、項9に記載の医薬組成物。
[項11] 該脂肪酸系混合イオン液体が、
a)炭素数2~7の低級脂肪族カルボン酸と、エタノールアミン、ジエタノールアミン、トリエタノールアミンのいずれかとからなる炭素数2~7の脂肪族カルボン酸系イオン液体の一種以上と、
b)二本鎖RNAの溶解度が1w/w%以下である炭素数2~20の脂肪族カルボン酸系イオン液体である、項10に記載の医薬組成物。
[項12] 経皮吸収型製剤である、項8~項11のいずれかに記載の医薬組成物。
[項13] IL-23発現に起因する疾患を治療するための、項8~項12のいずれかに記載の医薬組成物。
[項14] 該疾患が、乾癬である、項13に記載の医薬組成物。
[項15] 治療が必要な患者に、項1~項6のいずれかに記載の二本鎖RNAを投与することを含む、IL-23発現に起因する疾患の治療方法。
[項16] 該疾患が、乾癬である、項15に記載の治療方法。
[項17] IL-23発現に起因する疾患を治療するための医薬の製造における、項1~項6のいずれかに記載の二本鎖RNAの使用。
[項18] 該疾患が、乾癬である、項17に記載の使用。
[項19] IL-23発現に起因する疾患を治療するための、項1~項6のいずれかに記載の二本鎖RNA。
[項20] 該疾患が、乾癬である、項19に記載の二本鎖RNA。
[項21] 以下:
(1)脂肪族カルボン酸と有機アミンを混合して、イオン液体を得る工程;
(2)項1~項6のいずれかに記載の二本鎖RNAを(1)で得られたイオン液体に溶解させ、二本鎖RNA含有イオン液体溶液を得る工程;
(3)(2)で得られた二本鎖RNA含有イオン液体溶液を別に調製したイオン液体と混合して、主薬液を得る工程
を含む、二本鎖RNA含有経皮投与用製剤の製造方法。
[項22] 項1~項6のいずれかに記載の二本鎖RNAを含む発現ベクター。
[項23] 項22に記載の発現ベクターを含む細胞。
また、上記siRNA(No.1)~(No.5)のセンス鎖の3’末端およびアンチセンス鎖の5’末端に2個のチミジン(dT)が結合しているsiRNAは、以下のとおりである。
脂肪族カルボン酸としては、例えば炭素数2~20の脂肪族カルボン酸が挙げられる。炭素数2~20の脂肪族カルボン酸としては、炭素数2~7の低級脂肪酸およびケト酸、炭素数8~12の中級脂肪酸および炭素数13~20の高級脂肪酸が挙げられる。
本発明の脂肪族カルボン酸の例として、グリコール酸、メトキシ酢酸、レブリン酸、ヘキサン酸、2-エチルヘキサン酸、オクタン酸、デカン酸、ラウリン酸、ミリスチン酸、パルミチン酸、ステアリン酸、イソステアリン酸、オレイン酸などが挙げられる。その中でも、レブリン酸およびイソステアリン酸が好ましい。
本発明において、「IL-23発現に起因する疾患」とは、乾癬、関節リウマチ、骨関節炎、反応性関節炎、乾癬性関節炎、骨喪失、気道過敏症、慢性閉塞性肺疾患、脱髄障害、多発性硬化症、皮膚過敏症、急性移植拒絶、慢性移植拒絶、同種移植片拒絶、移植片対宿主病、全身性硬化症、全身性エリテマトーデス、自己免疫性炎症性腸疾患、泌尿器系炎症性疾患、心血管疾患、血管炎、周期性発熱、グルコース代謝障害、肺疾患、癌、歯周炎、ヘルペス性間質性角膜炎、アレルギー、炎症性疼痛、脊椎関節症、敗血症、敗血症性ショックまたは内毒素性ショック、髄膜炎、外科手術による外傷、自己免疫性血液障害、アルツハイマー病、サルコイドーシス、肝硬変、肝炎(自己免疫性肝炎を含めた)、原発性胆汁性肝硬変、ブドウ膜炎、甲状腺炎、アテローム性動脈硬化、脱毛症、ウィルソン病、糸球体腎炎、および脂質異常症が挙げられる。その中でも、乾癬が好ましい。
本発明において、「予防」とは、IL-23発現に起因する疾患の発症を阻止すること、疾患の発症を遅らせること、疾患の発症の危険性を低下させることをいう。
軟膏剤の基剤としては、例えば、白色ワセリン、流動パラフィン、ゲル化炭化水素などが挙げられる。ゲル化炭化水素とは、流動パラフィン、パラフィン、イソパラフィン、スクワラン、スクワレン、ポリブテンなどの炭化水素をゲル化したものである。特に、流動パラフィンをポリエチレン樹脂でゲル化したもの、油脂をゴム・エラストマーでゲル化したものが好ましい。例えば、流動パラフィン(日局)を5~10重量%のポリエチレン樹脂でゲル化したプラスチベース(商品名)、ポロイド(商品名)、ゲル化炭化水素にグリセリン脂肪酸エステルを加えて親水性を付与した親水ゲル化炭化水素(プラスチベースハイドロフィリック(商品名))などが挙げられる。
液剤の基剤としては、例えば、イソプロパノール、エタノール、プロピレングリコール、グリセリンなどのアルコール類と、オリーブ油、ダイズ油などの油脂類との混合溶液が挙げられる。
貼付剤の基剤としては、例えば、粘着剤が挙げられる。貼付剤の基剤としての粘着剤とは、主にエラストマーと粘着付与剤、軟化剤、充填剤、抗酸化剤などからなるものである。なお、軟化剤、充填剤および抗酸化剤は含まれていなくてもよい。
(1)siRNAの作製
配列番号1で示される塩基配列を用いて、配列デザインソフトウェア(SISNIPER)によりGC Score(siRNAのGC塩基含有率)、Load Score(siRNA内部エネルギーの偏り)、Position Score(標的mRNA中の位置)、Specificity Score(ゲノム中での配列特異性)、Profile Score(活性のあるsiRNAに共通する配列的特徴との比較)を算出し、これを基にTotal scoreを算出した。Total scoreが81.0以上であるIL-23の発現抑制効果を有しうる5種の標的配列を選定し、siRNA(No.1)~siRNA(No.5)を設計して、各siRNAオリゴヌクレオチドを化学的合成法によって合成した。siRNA(No.1)~(No.5)は、それぞれ配列番号2~6で表される配列とそれらに相補的な配列である標的配列を有する二本鎖RNAである。配列番号1は、ハリネズミ由来IL-23のp19サブユニットのmRNAの塩基配列であって、全長1358塩基長であり、当該配列情報は、GenBankに、GenBank Accession No. AF301619として登録されている。
in vitroにおいて、作製した5種のsiRNA(No.1)~(No.5)におけるIL-23の発現抑制効果を評価した。具体的には、樹状細胞株であるJAWSII細胞(2×106 cells/mL)を37℃、5%CO2条件下で24時間培養した後、5種類のsiRNAをトランスフェクション試薬であるLipofectamineを用いて細胞に導入した(30 pmol/mL)。24時間後にLPSを加え(100 ng/mL)、さらに6時間後に細胞を回収して溶解した。細胞溶解液中のIL-23をウェスタンブロットによって評価した。対照として、siRNAおよびLPS無添加の細胞溶液、LPSのみ添加の細胞溶液、ならびにIL-23の発現を抑制しないsiRNAであるGFPに対するsiRNA(以下、GFP siRNAとも称する)およびLPS添加の細胞溶液を用いた。
(1)siRNA含有製剤の調製
下表3に示す含有量で各成分を秤取し、以下の製法にしたがってsiRNA含有製剤を調製した。
レブリン酸およびトリエタノールアミンを混和して、イオン液体(以下、イオン液体A)を調製し、調製したイオン液体Aに亜硫酸水素ナトリウムおよび没食子酸プロピルを添加し、60℃で溶解させ、さらにsiRNAを添加して60℃で溶解して、siRNA含有イオン液体A溶液を調製した。別途、ステアリン酸およびジイソプロパノールアミンを混和し溶解させ、イオン液体(以下、イオン液体B)を調製した。次いで、siRNA含有イオン液体A溶液およびイオン液体Bを混和し、得られた溶液を主薬液とした。主薬液、エデト酸ナトリウム、軽質無水ケイ酸およびゲル化炭化水素を混和し、軟膏製剤を得た。
マウスを用いて、J. Control. Release, 2017, 246, 120-132に記載の方法にしたがって、乾癬モデルマウスを作製した。具体的には、5週齢の雄性C57BL/6Nマウス(入手元;日本エスエルシー、体重:約20g)の背部を剃毛し、その背部にイミキモドクリーム(ベルセナクリーム5%、持田製薬)を60mg、1日1回、4日間塗布して、乾癬症状を誘発した
マウスにおいて、皮膚の炎症に伴う紅班、角質細胞の過増殖による肥厚およびIL-23の発現量増加が認められた。これらの症状は乾癬の症状と一致していることから、乾癬モデルマウスとして使用可能であることが示された。
(1)で調製したsiRNA含有製剤を上記に塗布した際にsiRNAが皮膚のどの部位まで到達するか確認するため、FAMで蛍光標識したsiRNA含有製剤(試験製剤)をマウスの背部に塗布して、皮膚透過性試験を行った。対照製剤として、レブリン酸、トリエタノールアミン、イソステアリン酸、ジイソプロパノールアミンを除く、(1)のsiRNA含有製剤を用いた。
試験製剤および対照製剤を正常マウス(C57BL/6Nマウス)および乾癬モデルマウスの剃毛した背部に塗布し、塗布6時間後に各マウスの塗布部位の皮膚を回収して、常法により凍結切片を作製し、皮膚組織中での蛍光標識したsiRNAの分布を蛍光顕微鏡で観察した。
表皮にはIL-23を発現するランゲルハンス細胞が存在しており、塗布されたsiRNAは標的細胞に到達しうることが示された。
軽度乾癬モデルマウスを用いて、本発明のsiRNAの乾癬に対する治療効果を評価した。初めに、C57BL/6Nマウス(20匹)を、乾癬モデルマウスにおける未治療群、siRNA治療群およびタクロリムス治療群ならびに正常マウス群に無作為に分類した(各群n=5)。次いで、実施例2(2)の方法と同様の方法にしたがってマウスの剃毛した背部にイミキモドクリーム(持田製薬)を4日間塗布し、その塗布部位に5日目より実施例2(1)で調製したsiRNA含有製剤または市販のタクロリムス軟膏0.1%(ポーラファルマ)を100mg、1日1回、3日間塗布して治療を行い、8日目に皮膚を回収して、siRNA治療群およびタクロリムス治療群の凍結切片を作製した。また、マウスの塗布部位を5日目より治療せずに、8日目に皮膚を回収して、未治療群の凍結切片を作製した。それらの切片をHE染色および細胞の増殖マーカーであるKi-67で免疫染色を行い、表皮の肥厚の程度および皮膚の過増殖の程度を評価した。未治療群およびタクロリムス治療群をコントロールとした。また、正常マウスの皮膚とも表皮の肥厚の程度および皮膚の過増殖の程度を比較した。
未治療群のマウスにおいて皮膚の肥厚および細胞の過増殖が観察されたが、自然治癒傾向を示すマウスも一部存在していた。siRNAおよびタクロリムスの治療では、全てのマウスにおいて皮膚症状の改善が認められ、正常マウスの皮膚と同程度まで回復していた。siRNAとタクロリムス治療群間において差異は見られなかった。
本試験の結果より、本発明のsiRNA製剤は、既存の乾癬治療剤と同程度の治療効果を有することが示された。さらに、本発明のsiRNA含有製剤は、優れた皮膚透過性を有し、経皮投与用製剤として有用でありうることが示された。
重度乾癬モデルマウスを用いて、本発明のsiRNAの乾癬に対する治療効果を評価した。初めに、C57BL/6Nマウス(15匹)を、乾癬モデルマウスにおける未治療群、siRNA(IL-23 siRNAおよびGFP siRNA)治療群およびタクロリムス治療群ならびに正常マウス群に無作為に分類した(各群n=3)。次いで、実施例2(2)の方法と同様の方法にしたがってマウスの剃毛した背部にイミキモドクリームを7日間継続して塗布するとともに、その塗布部位に5日目より実施例2(1)で調製したsiRNA含有製剤、市販のタクロリムス軟膏またはGFP siRNAを100mg、1日1回、3日間塗布して治療を行い、8日目に皮膚を回収して、IL-23 siRNA治療群、タクロリムス治療群およびGFP siRNA治療群の凍結切片を作製した。また、マウスの塗布部位を5日目より治療せずに、8日目に皮膚を回収して、未治療群の凍結切片を作製した。それらの切片をHE染色および細胞の増殖マーカーであるKi-67で免疫染色を行い、表皮の肥厚の程度および皮膚の過増殖の程度を評価した。未治療群、タクロリムス治療群およびGFP siRNA治療群をコントロールとした。また、正常マウスの皮膚とも表皮の肥厚の程度および皮膚の過増殖の程度を比較した。
図5および図6において、本発明のsiRNAは、重度の乾癬症状であっても治療効果を発揮することが示された。また、図7において、本発明のsiRNAは表皮の肥厚の減少、角化細胞の増殖抑制、IL-23の発現量低下をもたらすことが示されたが、GFP siRNAの治療ではこれらの効果は認められなかった。
本試験の結果より、本発明のsiRNA製剤は、重度の乾癬症状であっても治療効果を発揮することが示され、さらに、その治療効果がIL-23の特異的な抑制を介するものでありうることが示された。
イオン液体によるsiRNAの安定化作用について評価した。具体的には、siRNA(No.2)(0.02w/w%)を上表3に示す含量のイオン液体成分(レブリン酸、トリエタノールアミン、イソステアリン酸、ジイソプロパノールアミン)で溶解し、その溶液水で希釈して得られたsiRNA溶液のCDスペクトルを円二色性分散計J-1500(日本分光)で測定した。対照として、水で溶解したsiRNA溶液および上記イオン液体成分と水の混合液を用いた。
また、上記と同様の方法で調製された、イオン液体成分に溶解したGFP siRNAとウシ胎児血清(Sigma)を1:1の容量比で混合して37℃で30分間インキュベーションし、アガロース電気泳動でsiRNAの分解を確認し、siRNAの安定性を評価した。また、血清非存在下でもsiRNAの安定性評価を行った。対象物質として、siRNAをTris-EDTA緩衝液(TE)、HEPES緩衝液(HBS)、またはRPMI1640培地(富士フイルム和光純薬)で希釈したものを用いた。
本試験の結果より、イオン液体はsiRNAの安定性向上に寄与することが示された。
Claims (14)
- センス鎖およびアンチセンス鎖を含む二本鎖RNAであって、各鎖が19~30ヌクレオチドからなり、配列番号2、配列番号3、配列番号4、配列番号5または配列番号6で示される塩基配列およびその相補的な塩基配列を含む、二本鎖RNA。
- 各鎖が、19~25ヌクレオチドからなる、請求項1に記載の二本鎖RNA。
- 各鎖の鎖内の1つ以上のヌクレオチドが化学修飾されているかまたは各鎖の5’末端もしくは3’末端のヌクレオチドが化学修飾されている、請求項1または2に記載の二本鎖RNA。
- 該化学修飾が、ホスホロチオエート修飾、2’-F修飾、2’-OMe修飾、2’-MOE修飾、LNA修飾およびENA修飾からなる群から選択される、請求項3に記載の二本鎖RNA。
- センス鎖の3’末端およびアンチセンス鎖の5’末端に1~10デオキシリボヌクレオチドが結合している、請求項1~4のいずれか一項に記載の二本鎖RNA。
- センス鎖の3’末端およびアンチセンス鎖の5’末端に2個のチミジン(dT)が結合している、請求項5に記載の二本鎖RNA。
- IL-23発現を特異的に抑制するための、請求項1~6のいずれか一項に記載の二本鎖RNA。
- 請求項1~7のいずれか一項に記載の二本鎖RNAを含む医薬組成物。
- さらに脂肪族カルボン酸系イオン液体を含む、請求項8に記載の医薬組成物。
- 該脂肪族カルボン酸系イオン液体が、2種以上の脂肪族カルボン酸系イオン液体を含む脂肪族カルボン酸系混合イオン液体である、請求項9に記載の医薬組成物。
- 該脂肪酸系混合イオン液体が、
a)炭素数2~7の低級脂肪族カルボン酸と、エタノールアミン、ジエタノールアミン、トリエタノールアミンのいずれかとからなる炭素数2~7の脂肪族カルボン酸系イオン液体の一種以上と、
b)二本鎖RNAの溶解度が1w/w%以下である炭素数2~20の脂肪族カルボン酸系イオン液体である、請求項10に記載の医薬組成物。 - 経皮吸収型製剤である、請求項8~11のいずれか一項に記載の医薬組成物。
- IL-23発現に起因する疾患を治療するための、請求項8~12のいずれか一項に記載の医薬組成物。
- 該疾患が、乾癬である、請求項13に記載の医薬組成物。
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