WO2024004599A1 - キャリアペプチドフラグメント及びその利用 - Google Patents
キャリアペプチドフラグメント及びその利用 Download PDFInfo
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- WO2024004599A1 WO2024004599A1 PCT/JP2023/021643 JP2023021643W WO2024004599A1 WO 2024004599 A1 WO2024004599 A1 WO 2024004599A1 JP 2023021643 W JP2023021643 W JP 2023021643W WO 2024004599 A1 WO2024004599 A1 WO 2024004599A1
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K7/00—Peptides having 5 to 20 amino acids in a fully defined sequence; Derivatives thereof
- C07K7/04—Linear peptides containing only normal peptide links
- C07K7/08—Linear peptides containing only normal peptide links having 12 to 20 amino acids
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K47/00—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient
- A61K47/50—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates
- A61K47/51—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent
- A61K47/62—Medicinal preparations characterised by the non-active ingredients used, e.g. carriers or inert additives; Targeting or modifying agents chemically bound to the active ingredient the non-active ingredient being chemically bound to the active ingredient, e.g. polymer-drug conjugates the non-active ingredient being a modifying agent the modifying agent being a protein, peptide or polyamino acid
- A61K47/64—Drug-peptide, drug-protein or drug-polyamino acid conjugates, i.e. the modifying agent being a peptide, protein or polyamino acid which is covalently bonded or complexed to a therapeutically active agent
- A61K47/645—Polycationic or polyanionic oligopeptides, polypeptides or polyamino acids, e.g. polylysine, polyarginine, polyglutamic acid or peptide TAT
Definitions
- the present invention relates to a method for introducing (transferring) a foreign substance from the outside of a eukaryotic cell into the inside of the cell, and a carrier peptide fragment used in the method.
- Patent Document 1 describes a construct for introducing a foreign substance that has a carrier peptide fragment consisting of an amino acid sequence known as a nucleolar localization signal (hereinafter also referred to as "NoLS") and a foreign substance. Disclosed. Since such a construct has cell membrane permeability, the foreign substance can be effectively introduced into the target cells.
- NoLS nucleolar localization signal
- the present invention was created in response to such a need, and an object of the present invention is to provide a carrier peptide fragment capable of introducing a target foreign substance from the outside of a eukaryotic cell into at least the cytoplasm of the cell. do. Another object of the present disclosure is to provide a construct for introducing a foreign substance that includes such a carrier peptide fragment. Another object of the present disclosure is to provide a method for introducing a target foreign substance from the outside of a eukaryotic cell into at least the cytoplasm of the cell.
- the method disclosed herein is a method of introducing a target foreign substance from the outside of a eukaryotic cell into at least the cytoplasm of the cell in vitro or in vivo, comprising: (1) The following amino acid sequence: KKRTLRKSNSRKKR (SEQ ID NO: 1); KKRTLRKSSNRKKR (SEQ ID NO: 2); KKRTLRKSNNRKKR (SEQ ID NO: 3); and KKRTLRKNSNRKKR (SEQ ID NO: 4); a carrier peptide fragment consisting of either; the target foreign substance bound to the N-terminus and/or C-terminus of the carrier peptide fragment; a step of preparing a foreign substance introduction construct having (2) supplying the above construct into a sample containing eukaryotic cells of interest; includes.
- the term "foreign substance” includes inorganic compounds and organic compounds that can be bonded directly or indirectly to the N-terminus or C-terminus of the carrier peptide fragment. , which has the molecular size and chemical properties that can be introduced into eukaryotic cells.
- a target foreign substance can be efficiently introduced into the cytoplasm from outside the eukaryotic cell (outside the cell membrane) through the cell membrane.
- the foreign substance may be at least one organic compound selected from the group consisting of polypeptides, nucleic acids, dyes, and drugs.
- polypeptide refers to a polymer having a structure in which a plurality of amino acids are bonded through peptide bonds. Polypeptides are not limited by the number of peptide bonds (ie, number of amino acid residues). That is, polypeptides include what is generally called a peptide, which has about 10 or more amino acid residues and less than 300 amino acid residues, and what is generally called a protein (a polymeric compound that typically has about 300 or more amino acid residues). . In this field, there is no strict distinction between polypeptides and proteins.
- nucleic acid refers to a polymer of nucleotides, and includes DNA and RNA.
- a “nucleic acid” is not limited by the number of bases.
- the foreign substance may be placed on the C-terminal side of the carrier peptide fragment.
- the eukaryotic cells into which the foreign substance introduction construct is introduced may be human or non-human mammalian cells.
- At least eukaryotic cells are accessed from the outside (i.e., outside the cell membrane) of the eukaryotic cells.
- the construct disclosed herein has the following amino acid sequence: KKRTLRKSNSRKKR (SEQ ID NO: 1); KKRTLRKSSNRKKR (SEQ ID NO: 2); KKRTLRKSNNRKKR (SEQ ID NO: 3); and KKRTLRKNSNRKKR (SEQ ID NO: 4); a carrier peptide fragment consisting of any one of the following, and the target foreign substance bound to the N-terminal side and/or C-terminal side of the carrier peptide fragment. Since such a construct has cell membrane permeability, a target foreign substance can be efficiently introduced into a target eukaryotic cell.
- the foreign substance can be at least one organic compound selected from the group consisting of polypeptides, nucleic acids, dyes, and drugs.
- the foreign substance may be placed on the C-terminal side of the carrier peptide fragment.
- the present disclosure also provides a carrier peptide fragment that can introduce a target foreign substance from outside a eukaryotic cell into at least the cytoplasm of the cell.
- the carrier peptide fragment disclosed herein has the following amino acid sequence: KKRTLRKSNSRKKR (SEQ ID NO: 1); KKRTLRKSSNRKKR (SEQ ID NO: 2); KKRTLRKSNNRKKR (SEQ ID NO: 3); and KKRTLRKNSNRKKR (SEQ ID NO: 4); Consists of any of the following. Since the carrier peptide fragment exhibits cell membrane permeability, foreign substances can be efficiently introduced into cells.
- Figure 1 shows the MFI values obtained by adding the constructs (additives) shown in Examples 1 to 5 to the culture medium of NSC-34 cells, culturing them, and then analyzing the cells using a flow cytometer. This is a graph showing.
- FIG. 2 is a graph showing the results of the cytotoxicity test for Samples 1 to 3 and Reference Example.
- Matters other than those specifically mentioned in this specification that are necessary for implementing the present technology for example, matters related to chemical synthesis of peptides, cell culture techniques, preparation of constructs containing peptides or nucleic acids as components
- General matters can be understood as matters designed by a person skilled in the art based on conventional technology in the fields of cell engineering, physiology, medicine, pharmacy, organic chemistry, biochemistry, genetic engineering, protein engineering, molecular biology, genetics, etc.
- the technology disclosed herein can be implemented based on the content disclosed in this specification and common technical knowledge in the field.
- amino acids are expressed using one-letter notation based on the nomenclature for amino acids shown in the IUPAC-IUB guidelines.
- amino acid residue includes the N-terminal amino acid and C-terminal amino acid of a peptide chain, unless otherwise specified.
- a "synthetic peptide” refers to a peptide chain whose peptide chain does not stably exist independently in nature, but which is produced by artificial chemical synthesis or biosynthesis (i.e., production based on genetic engineering). refers to a peptide fragment produced by a peptide fragment that can stably exist in a given composition.
- the term "peptide” used herein refers to an amino acid polymer having multiple peptide bonds, and is not limited by the number of amino acid residues.
- amino acid residues constituting the amino acid sequences shown in this specification may be in the L-configuration or the D-configuration. That is, each amino acid residue constituting the carrier peptide fragment disclosed herein may be in the L-configuration or the D-configuration. In other words, the amino acid sequence constituting the peptide or protein may have L-form amino acid residues and D-form amino acid residues.
- the left side always represents the N-terminal side and the right side represents the C-terminal side.
- the carrier peptide fragment disclosed herein has the following amino acid sequence: KKRTLRKSNSRKKR (SEQ ID NO: 1); KKRTLRKSSNRKKR (SEQ ID NO: 2); KKRTLRKSNNRKKR (SEQ ID NO: 3); and KKRTLRKNSNRKKR (SEQ ID NO: 4); Consists of any of the following.
- Carrier peptide fragments containing the amino acid sequences shown in SEQ ID NOs: 1-4 may be permeable to cell membranes. Therefore, such a carrier peptide fragment can impart cell membrane permeability to a construct having the carrier peptide fragment.
- carrier peptide fragment typically has the same amino acid sequence as the above amino acid sequence, but includes modified sequences of such amino acid sequences as long as they do not impair cell membrane permeability.
- modified sequence refers to an amino acid sequence formed by substitution, deletion, and/or addition (insertion) of one or several (typically two or three) amino acid residues ( modified amino acid sequence).
- Such a slightly modified sequence can be easily utilized by a person skilled in the art based on the information disclosed herein, and therefore may be included in the "carrier peptide fragment” as a technical concept disclosed herein.
- modified sequences in this specification include, for example, sequences resulting from so-called conservative amino acid replacement in which one, two, or three amino acid residues are replaced conservatively, and sequences where a predetermined amino acid Examples include sequences in which one, two, or three amino acid residues are added (inserted) or deleted.
- conservative substitutions include sequences in which a basic amino acid residue is replaced with another basic amino acid residue (for example, mutual substitution of a lysine residue and an arginine residue), or a sequence in which a hydrophobic amino acid residue is Examples include sequences in which hydrophobic amino acid residues are substituted (for example, mutual substitution of leucine residues, isoleucine residues, and valine residues).
- construct for introducing a foreign substance disclosed herein comprises a carrier peptide fragment disclosed herein, and an N-terminal and/or C-terminal side of the carrier peptide fragment. It has a foreign substance bound to it.
- the construct disclosed herein can be designed by linking (linking) a desired foreign substance directly or indirectly to the N-terminus and/or C-terminus of the carrier peptide fragment. ⁇ Can be constructed.
- the linker is not particularly limited, but may be a peptidic linker or a non-peptidic linker.
- the amino acid sequence constituting the peptidic linker is preferably a flexible amino acid sequence that does not cause steric hindrance.
- the peptidic linker contains, for example, one or more amino acid residues selected from glycine, alanine, serine, etc., and contains 10 or less (more preferably 1 to 5, such as 1 or 2) , 3, 4, or 5 amino acid residues).
- ⁇ -alanine may be used as such a linker.
- the non-peptide linker is not particularly limited, but for example, an alkyl linker, a PEG (polyethylene glycol) linker, an aminohexanoyl spacer, etc. can be used.
- the foreign substance can be, for example, an organic compound such as a polypeptide, a nucleic acid, a dye, a drug, etc.
- a peptide chain is designed to include the amino acid sequence constituting the polypeptide and the amino acid sequence constituting the carrier peptide fragment, and the peptide chain is biosynthesized or chemically synthesized. By doing so, a construct for introducing a foreign substance of interest can be prepared.
- anti-tumor agents including various nucleic acids such as DNA or RNA, dyes (for example, various fluorescent dye compounds such as FAM and FITC), or drugs (for example, nucleic acid-based anti-tumor agents such as 5-fluorouracil (5FU)),
- An organic compound that functions as an antiviral agent such as azidothymidine (AZT) is directly or indirectly bound to the N-terminal side and/or C-terminal side of the carrier peptide fragment described above by various conventionally known scientific methods.
- the construct can be prepared by Although not particularly limited, the functions of foreign substances include, for example, promotion of differentiation induction of stem cells (stem cell differentiation inducing activity), suppression of growth of tumor cells (antitumor activity), and suppression of growth of virus-infected cells (antiviral activity). activity) etc.
- the number of foreign substances that bind to the carrier peptide fragment is not particularly limited.
- one or more foreign substances may be attached to one carrier peptide fragment.
- a polypeptide, a nucleic acid, a drug, etc. may be bound to the C-terminus of one carrier peptide fragment, and a dye may be bound to the N-terminus. Binding a dye to a carrier peptide fragment is preferable because it facilitates evaluation of the efficiency of introduction of the construct into eukaryotic cells and its localization within the cell.
- the polypeptide (amino acid sequence) to be employed is not particularly limited.
- substances with a relatively large number of amino acid residues such as polypeptides or proteins with about 100 to 1000 amino acid residues, can also be employed as foreign substances.
- the total number of amino acid residues constituting a synthetic peptide prepared as a construct for introducing a foreign substance is several to several tens (for example, 10) or more, and is suitably 1000 or less, preferably 1000 or less. It is 600 or less, more preferably 500 or less, and particularly preferably 300 or less (for example, 10 to 300).
- Polypeptides of such length are easy to synthesize (biosynthesis, chemical synthesis) and easy to use.
- Foreign substances include mature forms or precursors (pro-forms) of polypeptides that are involved in functions such as development, differentiation, proliferation, canceration, homeostasis, and metabolic regulation of various cells and tissues (organs). , including pre-pro type) are preferred.
- the method for introducing a foreign substance disclosed herein can be carried out in order to introduce a polypeptide whose function has not been previously known into a cell and elucidate the function of the polypeptide in the cell (inside a living tissue). You can also do it.
- the eukaryotic cells to which the foreign substance is introduced are human or other mammalian stem cells, use of mature forms or precursors thereof of polypeptides that have various physiological activities involved in inducing differentiation of the stem cells.
- stem cells include somatic stem cells, embryonic stem cells, and induced pluripotent stem cells (iPS cells).
- iPS cells induced pluripotent stem cells
- the eukaryotic cells to be introduced are bacterially or virus-infected cells
- various polypeptides that are involved in inducing apoptosis in the infected cells or suppressing the proliferation of bacteria or viruses in the infected cells are added. It is preferable to use polypeptides that can suppress the spread of bacterial or viral infection from the infected cells.
- the polypeptide as a foreign substance is formed by substituting, deleting, and/or adding (inserting) one or several amino acid residues as long as it retains its function. It may also contain modified amino acid sequences.
- the ⁇ -amino group of the amino acid residue at the N-terminal side of the carrier peptide fragment is preferably acetylated.
- the ⁇ -amino group of the N-terminal amino acid of many proteins in eukaryotic cells is modified by acetylation, so this structure increases the stability of the construct within the cell. can be improved.
- the C-terminal amino acid residue of the construct is amidated.
- Amidating the carboxyl group of an amino acid residue can improve the structural stability (eg, protease resistance) of such constructs in the cytoplasm and within the nucleolus.
- the solubility of the construct in an aqueous solvent can be improved.
- aqueous solvents include water, various buffer solutions, physiological saline (eg, PBS), and cell culture solutions.
- the carboxyl group of the amino acid residue at the C-terminal side of the carrier peptide fragment is amidated.
- the foreign substance is a polypeptide and such polypeptide is bonded to the C-terminal side of the carrier peptide fragment, it is preferable to amidate the carboxyl group of the C-terminal amino acid residue of the polypeptide.
- those with relatively short peptide chains can be easily produced according to general chemical synthesis methods.
- any of the conventionally known solid phase synthesis method or liquid phase synthesis method may be employed.
- a solid phase synthesis method using Boc (t-butyloxycarbonyl) or Fmoc (9-fluorenylmethoxycarbonyl) as a protecting group for an amino group is suitable.
- the above-mentioned peptide chain having a desired amino acid sequence and modification can be synthesized by solid-phase synthesis using a commercially available peptide synthesizer. Note that only a portion of the peptide chain may be synthesized by the above method, for example, a peptide chain containing only a carrier peptide fragment or a carrier peptide fragment and a peptidic linker portion may be synthesized.
- the peptide portion may be produced by biosynthesis based on genetic engineering techniques. That is, a polynucleotide (typically DNA) having a nucleotide sequence (including the ATG start codon) encoding the desired amino acid sequence is synthesized. Various regulatory elements (including a promoter, a ribosome binding site, a terminator, an enhancer, and various cis elements that control the expression level) are used to express the synthesized polynucleotide (DNA) and the amino acid sequence in host cells. ) A recombinant vector carrying an expression gene construct consisting of the following is constructed depending on the host cell.
- This recombinant vector is introduced into a predetermined host cell (eg, yeast, insect cell, plant cell) by a common technique, and the host cell or a tissue or individual containing the cell is cultured under predetermined conditions.
- a predetermined host cell eg, yeast, insect cell, plant cell
- the desired peptide moiety can be obtained by isolating the peptide moiety from the host cell (in the medium if secreted) and performing refolding, purification, etc. as necessary.
- the method for constructing a recombinant vector and the method for introducing the constructed recombinant vector into a host cell may be any method conventionally used in the field, and such methods themselves are particularly characteristic of the present technology. Since this is not a complete description, a detailed explanation will be omitted.
- a fusion protein expression system can be used for efficient large-scale production within host cells. That is, a gene (DNA) encoding the amino acid sequence of a polypeptide of interest is chemically synthesized, and the synthetic gene is used in an appropriate fusion protein expression vector (for example, the pET series provided by Novagen, or the pET series provided by Amersham Biosciences).
- the vector is introduced into a suitable site of a GST (Glutathione S-transferase) fusion protein expression vector such as the pGEX series that has been developed.
- a host cell typically E. coli
- the obtained transformant is cultured to prepare the desired fusion protein.
- the protein is then extracted and purified.
- the obtained purified fusion protein is cleaved with a predetermined enzyme (protease), and the liberated target peptide fragment (ie, the designed artificial polypeptide) is recovered by a method such as affinity chromatography.
- a predetermined enzyme protease
- a desired construct artificial polypeptide
- a template DNA for a cell-free protein synthesis system i.e., a synthetic gene fragment containing a nucleotide sequence encoding the amino acid sequence of the peptide portion of the construct
- various compounds ATP, RNA, Polypeptides of interest can be synthesized in vitro using a so-called cell-free protein synthesis system (polymerase, amino acids, etc.).
- cell-free protein synthesis systems for example, Shimizu et al., Nature Biotechnology, 19, 751-755 (2001), Madin et al., Proc. Natl. Acad. Sci. USA, 97(2), 559-564(2000) may be helpful.
- cell-free protein synthesis kits for example, cell-free protein synthesis kits (for example, Cell Free Science Co., Ltd. in Japan) are producing polypeptides on a contract basis. available) are commercially available.
- a single-stranded or double-stranded polynucleotide containing a nucleotide sequence encoding the peptide portion of the construct and/or a nucleotide sequence complementary thereto can be easily produced (synthesized) by conventionally known methods. That is, by selecting codons corresponding to each amino acid residue constituting the designed amino acid sequence, the nucleotide sequence corresponding to the amino acid sequence can be easily determined and provided. Once the nucleotide sequence is determined, a polynucleotide (single strand) corresponding to the desired nucleotide sequence can be easily obtained using a DNA synthesizer or the like.
- the desired double-stranded DNA can be obtained by using the obtained single-stranded DNA as a template and employing various enzymatic synthesis methods (typically PCR).
- the polynucleotide may be in the form of DNA or RNA (such as mRNA).
- DNA can be provided in double-stranded or single-stranded form. When provided as a single strand, it may be a coding strand (sense strand) or a non-coding strand (antisense strand) having a complementary sequence thereto.
- the polynucleotides thus obtained can be used as materials for constructing recombinant genes (expression cassettes) for peptide production in various host cells or in cell-free protein synthesis systems, as described above. can.
- the construct can be suitably used as an active ingredient of a composition for use based on the function of a foreign substance.
- the construct may be in the form of a salt as long as the function of the foreign substance is not lost.
- acid addition salts obtainable by addition reaction of commonly used inorganic or organic acids according to conventional methods can be used. Accordingly, "constructs" as described herein and in the claims may include such salt forms.
- the construct can be used as an active ingredient in a composition that can contain various pharmaceutically acceptable carriers depending on the form of use.
- the carrier for example, carriers commonly used as diluents, excipients, etc. in peptide medicines are preferable.
- Such carriers may vary depending on the use and form of the construct for introducing a foreign substance, but typically include water, physiological buffers, and various organic solvents.
- Such carriers can also be aqueous solutions of alcohol (such as ethanol) at appropriate concentrations, glycerol, non-drying oils such as olive oil, or liposomes.
- alcohol such as ethanol
- non-drying oils such as olive oil, or liposomes.
- subsidiary components that may be included in the pharmaceutical composition, various fillers, extenders, binders, humectants, surfactants, pigments, fragrances, etc. can be mentioned.
- the form of the composition is not particularly limited. Examples include forms such as solutions, suspensions, emulsions, aerosols, foams, granules, powders, tablets, capsules, and ointments. Furthermore, for use in injections, etc., it can be made into a lyophilized product or granulated product by dissolving it in physiological saline or an appropriate buffer solution (for example, PBS) to prepare a drug solution immediately before use.
- physiological saline or an appropriate buffer solution for example, PBS
- PBS buffer solution
- the process itself of preparing drugs (compositions) in various forms using the construct (main component) and various carriers (auxiliary components) may be carried out in accordance with conventionally known methods, and such formulation methods themselves may be based on the present technology. A detailed explanation will be omitted since it is not a characteristic feature.
- An example of a detailed information source regarding prescriptions is Comprehensive Medicinal Chemistry, supervised by Corwin Hansch, published by Pergamon Press (1990).
- the present disclosure provides methods for introducing foreign substances in vivo or in vitro using the constructs disclosed herein.
- this method includes the following steps (1) and (2): (1) A foreign substance having a carrier peptide fragment consisting of an amino acid sequence shown in any one of SEQ ID NOs: 1 to 4, and a target foreign substance bound to the N-terminal side and/or C-terminal side of the carrier peptide fragment.
- preparing a substance introduction construct (2) supplying the above construct into a sample containing eukaryotic cells of interest.
- the sample supplied with the construct is incubated, and the construct is introduced into the eukaryotic cells in the sample.
- the method may include the step of introducing the construct.
- the above-mentioned “eukaryotic cells” include, for example, various tissues, organs, organs, blood, lymph, and the like.
- the above-mentioned “eukaryotic cells” include, for example, various cell masses, tissues, organs, organs, blood, and lymph fluid extracted from living bodies, cell lines, and the like.
- the construct disclosed herein or a composition containing the construct can be used in vivo in a manner and at a dose depending on its form and purpose.
- the desired amount is administered to the affected area (e.g., malignant tumor tissue, virus-infected tissue, inflamed tissue, etc.) of a patient (i.e., living body) by intravenous, intramuscular, subcutaneous, intradermal, or intraperitoneal injection. be able to.
- a solid form such as a tablet or a gel-like or aqueous jelly-like product such as an ointment may be applied directly to a desired tissue (i.e., an affected area such as a tissue or organ containing tumor cells, virus-infected cells, inflammatory cells, etc.). It can be administered to Alternatively, solid forms such as tablets can be administered orally. In the case of oral administration, it is preferable to encapsulate or apply a protective (coating) material to prevent decomposition by digestive enzymes in the gastrointestinal tract.
- an appropriate amount of the construct may be supplied at least once to the culture medium of the eukaryotic cells of interest.
- the amount of supply per time and the number of times of supply are not particularly limited as they may vary depending on conditions such as the type of eukaryotic cells to be cultured, cell density (cell density at the start of culture), passage number, culture conditions, type of medium, etc. .
- the carrier peptide fragment concentration in the culture solution is approximately within the range of 0.05 ⁇ M or more and 100 ⁇ M or less, for example, 0.5 ⁇ M or more and 50 ⁇ M or less, or for example, 1 ⁇ M or more and 20 ⁇ M or less.
- the incubation time after addition of the construct is not particularly limited as it may vary depending on the type of eukaryotic cells and various conditions.
- the duration may be 0.5 hours or more, 1 hour or more, 4 hours or more, 8 hours or more, or 20 hours or more.
- the incubation conditions may also vary depending on the type of eukaryotic cells, so they are not particularly limited, but for example, incubation can be performed at 37° C. in a 5% CO 2 atmosphere.
- An example of the in vitro introduction method is shown in the test example below.
- the method for evaluating the efficiency of construct introduction is not particularly limited. For example, if a dye (typically a fluorescent dye compound) is attached to the construct, microscopy (e.g. fluorescence microscopy) or flow cytometry may be used to assess the efficiency of introduction into eukaryotic cells. can be evaluated. Furthermore, the introduction efficiency of the above-mentioned construct can also be evaluated by immunochemical techniques (eg, Western blotting, immune cell staining, etc.) using an antibody that specifically recognizes the peptide portion of the above-mentioned construct.
- immunochemical techniques eg, Western blotting, immune cell staining, etc.
- Item 1 A method of introducing a target foreign substance from outside a eukaryotic cell into at least the cytoplasm of the cell in vitro, comprising: (1) The following amino acid sequence: KKRTLRKSNSRKKR (SEQ ID NO: 1); KKRTLRKSSNRKKR (SEQ ID NO: 2); KKRTLRKSNNRKKR (SEQ ID NO: 3); and KKRTLRKNSNRKKR (SEQ ID NO: 4); a carrier peptide fragment consisting of either; the target foreign substance bound to the N-terminus and/or C-terminus of the carrier peptide fragment; a step of preparing a foreign substance introduction construct having (2) supplying the above construct into a sample containing eukaryotic cells of interest; How to include.
- KKRTLRKSNSRKKR SEQ ID NO: 1
- KKRTLRKSSNRKKR SEQ ID NO: 2
- KKRTLRKSNNRKKR SEQ ID NO: 3
- KKRTLRKNSNRKKR
- Item 2 The method according to Item 1, wherein the foreign substance is at least one organic compound selected from the group consisting of polypeptides, nucleic acids, dyes, and drugs.
- Item 3 The method according to item 1 or 2, wherein the foreign substance is located on the C-terminal side of the carrier peptide fragment.
- Item 4 The method according to any one of Items 1 to 3, wherein the eukaryotic cell into which the construct is introduced is a human or non-human mammalian cell.
- Item 5 Amino acid sequence below: KKRTLRKSNSRKKR (SEQ ID NO: 1); KKRTLRKSSNRKKR (SEQ ID NO: 2); KKRTLRKSNNRKKR (SEQ ID NO: 3); and KKRTLRKNSNRKKR (SEQ ID NO: 4); a carrier peptide fragment consisting of either; A construct comprising the target foreign substance bound to the N-terminus and/or C-terminus of the carrier peptide fragment.
- Item 6 The construct according to Item 5, wherein the foreign substance is at least one organic compound selected from the group consisting of polypeptides, nucleic acids, dyes, and drugs.
- Item 7 The construct according to item 5 or 6, wherein the foreign substance is located on the C-terminal side of the carrier peptide fragment.
- Item 8 Amino acid sequence below: KKRTLRKSNSRKKR (SEQ ID NO: 1); KKRTLRKSSNRKKR (SEQ ID NO: 2); KKRTLRKSNNRKKR (SEQ ID NO: 3); and KKRTLRKNSNRKKR (SEQ ID NO: 4); A carrier peptide fragment consisting of either
- a construct having a synthetic peptide consisting of the amino acid sequence shown in Table 1 was prepared.
- a construct having peptide 1 is designated as sample 1, a construct having peptide 2 as sample 2, a construct having peptide 3 as sample 3, and a construct having peptide 4 as sample 4.
- Samples 1 to 4 were all synthesized and prepared by Eurofin Genomics Co., Ltd.
- the ⁇ -amino groups of the amino acid residues on the N-terminal side of peptides 1 to 4 were all acetylated.
- the fluorescent dye FAM C 21 H 12 O 7 :5(6)-Carboxyfluorescein, molecular weight 376.3, excitation wavelength 495 nm, fluorescence wavelength 520 nm
- Samples 1 to 4 were each diluted with dimethyl sulfoxide (DMSO) to prepare sample solutions 1 to 4 each having a sample concentration of 2 mM.
- NSC-34 cells were cultured in a general culture medium, DMEM (Dulbecco's modified Eagle's medium (manufactured by Fuji Film Wako Pure Chemical Industries, Ltd., Cat No. 044-29765)) containing 10% FBS (fetal bovine serum). After washing the NSC-34 cells adhered to the culture plate with PBS, a 0.25% trypsin/EDTA solution was added and incubated at 37°C for 3 minutes. After the incubation, the above 10% FBS-containing DMEM was added to inactivate trypsin, followed by centrifugation at 150 xg for 5 minutes to precipitate the cells.
- DMEM Dulbecco's modified Eagle's medium (manufactured by Fuji Film Wako Pure Chemical Industries, Ltd., Cat No. 044-29765)
- FBS fetal bovine serum
- the above 10% FBS-containing DMEM was added to the precipitate (cell pellet) to prepare a cell suspension of approximately 2 ⁇ 10 5 cells/mL. 1 mL of the cell suspension was added to the wells of a commercially available 6-well plate (manufactured by AGC Techno Glass Co., Ltd.), and cells were seeded (approximately 2 ⁇ 10 5 cells/well). Further, the above 2mM sample solution 1 was diluted with the above 10% FBS-containing DMEM to prepare a sample solution 1 having a concentration of sample 1 of 20 ⁇ M.
- the culture supernatant was removed from the wells, and the cells in the wells were washed twice with 1 mL of PBS.
- 200 ⁇ L of 0.25% trypsin/EDTA solution was added to the wells and incubated at 37° C. for 3 minutes.
- trypsin was inactivated by adding 400 ⁇ L of the above 10% FBS-containing DMEM to the wells, and then the cell suspension in the wells was transferred to a tube and the cells were collected. Thereafter, 600 ⁇ L of PBS was further added to the wells to wash the wells. Then, by transferring the PBS in the well to the tube, the cells remaining in the well were collected into the tube.
- This tube was centrifuged at 4° C. and 210 ⁇ g for 5 minutes. After centrifugation, the supernatant was removed, the precipitate (cell pellet) was suspended (washed) in 1 mL of PBS, and centrifugation was performed under the same conditions as above. After repeating this operation twice, the supernatant was removed to obtain cells (cell pellets) cultured in the sample 1-containing medium.
- the cell membrane permeability of Sample 1 was analyzed using a flow cytometer.
- a flow cytometer On-Chip Flowcytometer (manufactured by On-Chip Biotechnologies Co., LTD.) was used.
- the cell pellet obtained above was suspended in 100 ⁇ L of On-Chip T buffer to prepare a cell suspension for analysis.
- Example 2 The same procedure as Example 1 was carried out except that Sample Solution 1 was replaced with Sample Solution 2 prepared above.
- Example 3 The same procedure as Example 1 was carried out except that Sample Solution 1 was replaced with Sample Solution 3 prepared above.
- Example 4 The same procedure as in Example 1 was carried out except that sample solution 1 was replaced with sample solution 4 prepared above.
- Example 5 Example 1 was carried out in the same manner as in Example 1, except that sample solution 1 was a FAM solution diluted with DMSO.
- concentration of the FAM solution was used so as to be the same as the concentration of the sample 1 solution (ie, the FAM concentration of the culture solution in the well was 10 ⁇ M, and the DMSO concentration was 0.5%).
- FIG. 1 is a graph showing the MFI values in each example.
- Examples 1 to 4 had higher MFI values than Example 5. That is, it can be seen that binding of at least one of peptides 1 to 4 to FAM, which is a foreign substance, imparts cell membrane permeability to the construct and introduces more FAM into the cells.
- FAM FAM
- the present inventor's studies have shown that constructs having any of peptides 1 to 4 are suitable for constructs containing any of peptides 1 to 4, regardless of whether the foreign substance is not only a fluorescent dye but also a polypeptide, a nucleic acid, or a drug. However, it was confirmed that such foreign substances are efficiently introduced into the cytoplasm from outside the cell.
- sample solutions 1 to 3 were diluted with the above culture medium to prepare sample solutions 1 to 3 of 12.5 ⁇ M, 25 ⁇ M, 50 ⁇ M, and 100 ⁇ M. Furthermore, as a reference example, a construct comprising a carrier peptide fragment having the amino acid sequence shown in SEQ ID NO: 5 and exhibiting cell membrane permeability was prepared. The reference example had the same structure as Samples 1 to 3 except for the amino acid sequence constituting the carrier peptide fragment. Regarding the reference example, a solution containing 12.5 ⁇ M to 100 ⁇ M of the reference example (hereinafter also referred to as "solution (reference example)”) was prepared in the same manner as sample solutions 1 to 3.
- solution reference example
- a 0.25% trypsin/0.53 mM EDTA solution was added and incubated at 37°C for 3 to 5 minutes. After the incubation, the above culture medium was added to inactivate the trypsin, followed by centrifugation at 900 rpm for 5 minutes at room temperature to precipitate the cells. After removing the supernatant produced by centrifugation, the above culture medium was added to the precipitate (cell pellet) to prepare a cell suspension of approximately 1 ⁇ 10 5 cells/mL.
- 100 ⁇ L of the cell suspension was added to the wells of a commercially available 96-well plate (manufactured by AGC Techno Glass Co., Ltd.), and cells were seeded (approximately 1 ⁇ 10 4 cells/well) at 37° C. in 5% CO 2 . Incubation was performed for 24 hours in an incubator. After the incubation, the medium in the wells was removed, and 90 ⁇ L of 12.5 ⁇ M, 25 ⁇ M, 50 ⁇ M, and 100 ⁇ M sample solutions 1 to 3 and solutions (reference examples) prepared above were added to 3 wells (i.e., in triplicate). ).
- Cell proliferation/cytotoxicity kit Cell Counting Kit-8 (CCK-8, manufactured by Dojindo Laboratories) was added to each well. Thereafter, incubation was performed for 1.5 hours in an incubator at 37° C. and 5% CO 2 , and the absorbance at 450 nm was measured using a microplate reader. Then, the arithmetic mean of the absorbance of three wells was calculated for each type and concentration of solution added to the culture medium. Cell viability was determined by setting the average value of the absorbance of 3 wells in which cells were cultured in the above culture medium without DMSO as 100%. The results are shown in Figure 2. The horizontal axis of the graph in FIG.
- a target foreign substance can be introduced into the cytoplasm from the outside of eukaryotic cells (particularly various animal cells represented by humans and other mammals that do not have a cell wall). Artificially produced carrier peptide fragments and constructs having the carrier peptide fragments are provided. By using such a construct, a foreign substance of interest can be introduced into target cells more safely and effectively, and cells into which the foreign substance has been introduced as well as biological tissues such as organs containing cells containing the foreign substance can be introduced. Obtainable. Additionally, the low cytotoxicity of the carrier peptide fragment may allow the use of higher concentrations of the construct than previously possible, thereby allowing the introduction of high concentrations of foreign substances. Furthermore, by utilizing such constructs, therapeutic agents for diseases can be provided.
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Abstract
Description
(1)以下のアミノ酸配列:
KKRTLRKSNSRKKR(配列番号1);
KKRTLRKSSNRKKR(配列番号2);
KKRTLRKSNNRKKR(配列番号3);および
KKRTLRKNSNRKKR(配列番号4);
のいずれかから成るキャリアペプチドフラグメントと、
上記キャリアペプチドフラグメントのN末端側及び/又はC末端側に結合した上記目的の外来物質と、
を有する外来物質導入用構築物を用意する工程と、
(2)上記構築物を、目的とする真核細胞を含む試料中に供給する工程と、
を包含する。
ここで、「外来物質」とは、上記キャリアペプチドフラグメントのN末端側またはC末端側に直接的または適当なリンカーを介して間接的に結合可能な無機化合物および有機化合物を包含するものであって、真核細胞内に導入可能な分子サイズ及び化学的性質を有するものをいう。
ここで、「ポリペプチド」とは、複数のアミノ酸がペプチド結合により結合した構造を有するポリマーをいう。ポリペプチドは、ペプチド結合の数(即ち、アミノ酸残基数)によって限定されない。即ち、ポリペプチドは、アミノ酸残基数が10以上300未満程度の一般にペプチドと呼ばれるものと、一般にタンパク質(典型的には300以上のアミノ酸残基から成る高分子化合物)と呼ばれるものとを包含する。当該分野においては、ポリペプチドとタンパク質とは厳密に区分されていない。本明細書においては、複数のアミノ酸残基から成るポリマー(オリゴマーを包含する。)を、ポリペプチドと総称する。
また、「核酸」とは、ヌクレオチドの重合体をいい、DNAおよびRNAを包含する。「核酸」は、塩基数によって限定されない。
即ち、ここで開示される構築物は、以下のアミノ酸配列:
KKRTLRKSNSRKKR(配列番号1);
KKRTLRKSSNRKKR(配列番号2);
KKRTLRKSNNRKKR(配列番号3);および
KKRTLRKNSNRKKR(配列番号4);
のいずれかから成るキャリアペプチドフラグメントと、上記キャリアペプチドフラグメントのN末端側及び/又はC末端側に結合した上記目的の外来物質と、を有する。
かかる構築物は細胞膜透過性を有するため、目的とする真核細胞に目的とする外来物質を効率よく導入することができる。
KKRTLRKSNSRKKR(配列番号1);
KKRTLRKSSNRKKR(配列番号2);
KKRTLRKSNNRKKR(配列番号3);および
KKRTLRKNSNRKKR(配列番号4);
のいずれかから成る。
上記キャリアペプチドフラグメントは、細胞膜透過性を発揮するため、外来物質を細胞内に効率よく導入させることができる。
また、ここで開示される技術は、本明細書に開示されている内容と当該分野における技術常識とに基づいて実施することができる。なお、以下の説明では、場合によってアミノ酸をIUPAC-IUBガイドラインで示されたアミノ酸に関する命名法に準拠した1文字表記で表す。なお、本明細書において「アミノ酸残基」とは、特に言及する場合を除いて、ペプチド鎖のN末端アミノ酸及びC末端アミノ酸を包含する用語である。
なお、本明細書中に記載されるアミノ酸配列は、常に左側がN末端側であり右側がC末端側を表す。
KKRTLRKSNSRKKR(配列番号1);
KKRTLRKSSNRKKR(配列番号2);
KKRTLRKSNNRKKR(配列番号3);および
KKRTLRKNSNRKKR(配列番号4);
のいずれかから成る。配列番号1~4に示すアミノ酸配列を含むキャリアペプチドフラグメントは、細胞膜透過性を有し得る。そのため、かかるキャリアペプチドフラグメントは、当該キャリアペプチドフラグメントを有する構築物に、細胞膜透過性を付与することができる。
本明細書における改変配列の典型例としては、例えば、1個、2個または3個のアミノ酸残基が保守的に置換したいわゆる同類置換(conservative amino acid replacement)によって生じた配列や、所定のアミノ酸配列について1個、2個または3個のアミノ酸残基が付加(挿入)した若しくは欠失した配列等が挙げられる。同類置換の典型例としては、例えば、塩基性アミノ酸残基が別の塩基性アミノ酸残基に置換した配列(例えばリジン残基とアルギニン残基との相互置換)や、疎水性アミノ酸残基が別の疎水性アミノ酸残基に置換した配列(例えばロイシン残基、イソロイシン残基、およびバリン残基の相互置換)等が挙げられる。
リンカーは、特に限定されるものではないが、ペプチド性リンカーであってもよく、非ペプチド性リンカーであってもよい。特に限定されるものではないが、ペプチド性リンカーを構成するアミノ酸配列は立体障害を生じさせず、かつ、柔軟なアミノ酸配列であることが好ましい。ペプチド性リンカーは、例えば、グリシン、アラニン、およびセリン等から選択されるアミノ酸残基を1種または2種以上含む、10個以下(より好ましくは1個以上5個以下、例えば1個、2個、3個、4個、または5個のアミノ酸残基)のアミノ酸残基からなるリンカーであり得る。また、かかるリンカーとして、βアラニンを用いてもよい。非ペプチド性リンカーとしては、特に限定されるものではないが、例えばアルキルリンカー、PEG(ポリエチレングリコール)リンカー、アミノヘキサノイルスペーサ等を用いることができる。
外来物質がポリペプチドである場合には、該ポリペプチドを構成するアミノ酸配列と、キャリアペプチドフラグメントを構成するアミノ酸配列とを含むようにペプチド鎖を設計し、該ペプチド鎖を生合成あるいは化学合成することによって、目的の外来物質導入用構築物を作製することができる。また、種々のDNA又はRNAのような核酸、色素(例えばFAMやFITC等の種々の蛍光色素化合物)、あるいは薬剤(例えば5-フルオロウラシル(5FU)等の核酸系抗腫瘍剤を含む抗腫瘍剤やアジドチミジン(AZT)等の抗ウイルス剤等)として機能する有機化合物を従来公知の種々の科学的手法により、上述したキャリアペプチドフラグメントのN末端側及び/又はC末端側に直接的もしくは間接的に結合させて構築物を調製することができる。
特に限定するものではないが、外来物質が有する機能は、例えば、幹細胞の分化誘導の促進(幹細胞分化誘導活性)、腫瘍細胞の増殖抑制(抗腫瘍活性)、ウイルス感染細胞の増殖抑制(抗ウイルス活性)等であり得る。
典型的には、外来物質導入用構築物として作製する合成ペプチドを構成する総アミノ酸残基数は、数個乃至数十個(例えば10個)以上であって、1000以下が適当であり、好ましくは600以下であり、さらに好ましくは500以下であり、特に300以下(例えば10~300)が好適である。このような長さのポリペプチドは合成(生合成、化学合成)が容易であり、使用しやすい。
例えば、外来物質の導入する対象となる真核細胞がヒト又はその他哺乳動物の幹細胞である場合、当該幹細胞の分化誘導に関与する種々の生理活性を有するポリペプチドの成熟型またはその前駆体の利用が好ましい。なお、「幹細胞」は、体性幹細胞、胚性幹細胞、人工多能性幹細胞(Induced pluripotent stem cells:iPS細胞)を包含する。また、外来物質の導入する対象となる真核細胞ががん細胞(腫瘍細胞)である場合、当該がん細胞(腫瘍細胞)のアポトーシス誘導に関与する種々のポリペプチドの利用が好ましい。あるいは、この場合においては、がん細胞(腫瘍細胞)が免疫監視機構の機能を抑制することを阻害し得るポリペプチドの利用が好ましい。さらに、導入の対象となる真核細胞が細菌感染細胞やウイルス感染細胞である場合、当該感染細胞のアポトーシス誘導に関与する種々のポリペプチドや、当該感染細胞において細菌もしくはウイルスが増殖することを抑制し得るポリペプチドや、当該感染細胞から細菌もしくはウイルスの感染が拡大することを抑制し得るポリペプチドの利用が好ましい。
なお、キャリアペプチドフラグメントと同様、外来物質としてのポリペプチドは、その機能を保持する限りにおいて、1個または数個のアミノ酸残基が置換、欠失及び/又は付加(挿入)されて形成される改変アミノ酸配列を含んでいてもよい。
例えば、キャリアペプチドフラグメントのN末端側に外来物質が結合している構築物の場合、キャリアペプチドフラグメントのC末端側のアミノ酸残基のカルボキシル基がアミド化されていることが好ましい。また、例えば外来物質がポリペプチドであり、かかるポリペプチドがキャリアペプチドフラグメントのC末端側に結合している場合は、当該ポリペプチドのC末端アミノ酸残基のカルボキシル基をアミド化することが好ましい。
一般的な技法によって、この組換えベクターを所定の宿主細胞(例えばイースト、昆虫細胞、植物細胞)に導入し、所定の条件で当該宿主細胞又は該細胞を含む組織や個体を培養する。このことにより、目的とするペプチドを細胞内で生産させることができる。そして、宿主細胞(分泌された場合は培地中)からペプチド部分を単離し、必要に応じてリフォールディング、精製等を行うことによって、目的のペプチド部分を得ることができる。
なお、組換えベクターの構築方法及び構築した組換えベクターの宿主細胞への導入方法等は、当該分野で従来から行われている方法をそのまま採用すればよく、かかる方法自体は特に本技術を特徴付けるものではないため、詳細な説明は省略する。
或いは、無細胞タンパク質合成システム用の鋳型DNA(即ち、構築物のペプチド部分のアミノ酸配列をコードするヌクレオチド配列を含む合成遺伝子断片)を構築し、ペプチド部分の合成に必要な種々の化合物(ATP、RNAポリメラーゼ、アミノ酸類等)を使用し、いわゆる無細胞タンパク質合成システムを採用して目的のポリペプチドをインビトロで合成することができる。無細胞タンパク質合成システムについては、例えばShimizuらの論文(Shimizu et al., Nature Biotechnology, 19, 751-755(2001))、Madinらの論文(Madin et al., Proc. Natl. Acad. Sci. USA, 97(2), 559-564(2000))が参考になる。これら論文に記載された技術に基づいて、本願出願時点において既に多くの企業がポリペプチドの受託生産を行っており、また、無細胞タンパク質合成用キット(例えば、日本の(株)セルフリーサイエンスから入手可能)が市販されている。
こうして得られるポリヌクレオチドは、上述のように、種々の宿主細胞中で又は無細胞タンパク質合成システムにて、ペプチド生産のための組換え遺伝子(発現カセット)を構築するための材料として使用することができる。
上記担体としては、例えば、希釈剤、賦形剤等としてペプチド医薬において一般的に使用される担体が好ましい。かかる担体としては、外来物質導入用構築物の用途や形態に応じて適宜異なり得るが、典型的には、水、生理学的緩衝液、種々の有機溶媒が挙げられる。また、かかる担体は、適当な濃度のアルコール(エタノール等)水溶液、グリセロール、オリーブ油のような不乾性油であり得、或いはリポソームであってもよい。また、医薬用組成物に含有させ得る副次的成分としては、種々の充填剤、増量剤、結合剤、付湿剤、表面活性剤、色素、香料等が挙げられる。
構築物(主成分)および種々の担体(副成分)を材料にして種々の形態の薬剤(組成物)を調製するプロセス自体は従来公知の方法に準じればよく、かかる製剤方法自体は本技術を特徴付けるものでもないため詳細な説明は省略する。処方に関する詳細な情報源として、例えばComprehensive Medicinal Chemistry, Corwin Hansch監修,Pergamon Press刊(1990)が挙げられる。
(1)配列番号1~4のいずれかに示されるアミノ酸配列から成るキャリアペプチドフラグメントと、該キャリアペプチドフラグメントのN末端側及び/又はC末端側に結合した目的とする外来物質と、を有する外来物質導入用構築物を用意する工程と、
(2)上記構築物を、目的とする真核細胞を含む試料中に供給する工程と
を包含する。また、ここで開示される方法では、さらに、上記(2)の工程の後、(3)の工程として、上記構築物が供給された試料をインキュベートして、該試料中の真核細胞内にかかる構築物を導入する工程を含み得る。
なお、インビトロにおける導入方法について、一例を後述の試験例において示している。
項1:真核細胞の外部から少なくとも該細胞の細胞質内に目的とする外来物質をインビトロにおいて導入する方法であって、
(1)以下のアミノ酸配列:
KKRTLRKSNSRKKR(配列番号1);
KKRTLRKSSNRKKR(配列番号2);
KKRTLRKSNNRKKR(配列番号3);および
KKRTLRKNSNRKKR(配列番号4);
のいずれかから成るキャリアペプチドフラグメントと、
上記キャリアペプチドフラグメントのN末端側及び/又はC末端側に結合した上記目的の外来物質と、
を有する外来物質導入用構築物を用意する工程と、
(2)上記構築物を、目的とする真核細胞を含む試料中に供給する工程と、
を包含する方法。
項2:上記外来物質が、ポリペプチド、核酸、色素および薬剤から成る群から選択される少なくとも1種の有機化合物である、項1に記載の方法。
項3:上記外来物質が、上記キャリアペプチドフラグメントのC末端側に配置されている、項1または2に記載の方法。
項4:上記構築物を導入する対象の真核細胞がヒトまたはヒト以外の哺乳動物の細胞である、項1~3のいずれか一項に記載の方法。
項5:
以下のアミノ酸配列:
KKRTLRKSNSRKKR(配列番号1);
KKRTLRKSSNRKKR(配列番号2);
KKRTLRKSNNRKKR(配列番号3);および
KKRTLRKNSNRKKR(配列番号4);
のいずれかから成るキャリアペプチドフラグメントと、
上記キャリアペプチドフラグメントのN末端側及び/又はC末端側に結合した上記目的の外来物質と、を有する構築物。
項6:上記外来物質が、ポリペプチド、核酸、色素および薬剤から成る群から選択される少なくとも1種の有機化合物である、項5に記載の構築物。
項7:上記外来物質が、上記キャリアペプチドフラグメントのC末端側に配置されている、項5または6に記載の構築物。
項8:
以下のアミノ酸配列:
KKRTLRKSNSRKKR(配列番号1);
KKRTLRKSSNRKKR(配列番号2);
KKRTLRKSNNRKKR(配列番号3);および
KKRTLRKNSNRKKR(配列番号4);
のいずれかから成る、キャリアペプチドフラグメント。
表1に示すアミノ酸配列で構成された合成ペプチドを有する構築物を用意した。ペプチド1を有する構築物をサンプル1、ペプチド2を有する構築物をサンプル2、ペプチド3を有する構築物をサンプル3、および、ペプチド4を有する構築物をサンプル4とする。サンプル1~4は、いずれもユーロフィンジェノミクス株式会社に合成を依頼して準備した。
<フローサイトメトリーによる細胞膜透過性評価>
真核細胞としてNSC-34細胞(mouse motor neuron-like hybrid cell line)を使用し、構築物1~4の細胞膜透過性を解析した。例1~4では、上記調製したサンプル1~4をそれぞれ用い、例5では、FAM溶液を用いた。
NSC-34細胞を一般的な培養培地である10%FBS(fetal bovine serum)含有DMEM(Dulbecco’s modified Eagle’s medium(富士フィルム和光純薬株式会社製、Cat No.044-29765))で培養した。
培養プレートに接着したNSC-34細胞をPBSで洗浄後、0.25%トリプシン/EDTA溶液を添加し、37℃中で3分間インキュベートを行った。該インキュベート後、上記10%FBS含有DMEMを加え、トリプシンを不活性化させた後、150×gで5分間の遠心分離を行い細胞を沈殿させた。遠心分離によって生じた上清を取り除いた後、沈殿(細胞ペレット)に上記10%FBS含有DMEMを加え、凡そ2×105cells/mLの細胞懸濁液を調製した。該細胞懸濁液を市販の6穴(ウェル)プレート(AGCテクノグラス株式会社製)のウェルに1mL加え、細胞を播種した(凡そ2×105cells/ウェル)。また、上記2mMサンプル溶液1を上記10%FBS含有DMEMで希釈し、サンプル1の濃度が20μMのサンプル溶液1を準備した。そして、該ウェルに上記20μMサンプル溶液1を1mL添加した(即ち、ウェル中の培養液のサンプル1の濃度が10μM、DMSO濃度が0.5%となるようにした)。その後、細胞を5%CO2条件下で、37℃で20時間インキュベートを行った。
かかる解析のために、上記得られた細胞ペレットを100μLのOn-Chip T bufferで懸濁し、解析用の細胞懸濁液を用意した。
サンプル溶液1を上記調製したサンプル溶液2とした以外は例1と同様に実施した。
(例3)
サンプル溶液1を上記調製したサンプル溶液3とした以外は例1と同様に実施した。
(例4)
サンプル溶液1を上記調製したサンプル溶液4とした以外は例1と同様に実施した。
(例5)
サンプル溶液1をDMSOで希釈したFAM溶液とした以外は例1と同様に実施した。なお、かかるFAM溶液の濃度はサンプル1溶液の濃度(即ち、ウェル中の培養液のFAM濃度が10μM、DMSO濃度が0.5%)と同じになるように用いた。
なお、詳細なデータは示していないが、本発明者の検討によって、ペプチド1~4のいずれかを有する構築物は、外来物質が蛍光色素のみならず、ポリペプチド、核酸、および薬剤のいずれであっても、かかる外来物質は、効率よく細胞の外部から細胞質内に導入されることが確認された。
<キャリアペプチドフラグメントの細胞毒性評価>
真核細胞としてWS-1細胞(human skin fibroblastoid cell line、American Type Culture Collectionより入手、ATCC No.CRL-1502)を使用し、上記ペプチド1~3の細胞毒性を評価した。培養培地としては、10%FBS(fetal bovine serum)含有DMEM(富士フィルム和光純薬株式会社製、Cat No.044-29765))を使用した。試験2では、サンプル1~3をそれぞれDMSOで溶解し、6mMサンプル溶液1~3を調製した。6mMサンプル溶液1~3を上記培養培地で希釈し、12.5μM、25μM、50μM、および100μMのサンプル溶液1~3を調製した。また、参考例として、配列番号5に示すアミノ酸配列から成る、細胞膜透過性を発揮するキャリアペプチドフラグメントを備える構築物を準備した。参考例は、キャリアペプチドフラグメントを構成するアミノ酸配列以外は、サンプル1~3と同様の構成となるようにした。参考例についても、サンプル溶液1~3と同様にして、12.5μM~100μMの参考例を含む溶液(以下、「溶液(参考例)」ともいう。)を調製した。
Claims (8)
- 真核細胞の外部から少なくとも該細胞の細胞質内に目的とする外来物質をインビトロにおいて導入する方法であって、
(1)以下のアミノ酸配列:
KKRTLRKSNSRKKR(配列番号1);
KKRTLRKSSNRKKR(配列番号2);
KKRTLRKSNNRKKR(配列番号3);および
KKRTLRKNSNRKKR(配列番号4);
のいずれかから成るキャリアペプチドフラグメントと、
前記キャリアペプチドフラグメントのN末端側及び/又はC末端側に結合した前記目的の外来物質と、
を有する外来物質導入用構築物を用意する工程と、
(2)前記構築物を、目的とする真核細胞を含む試料中に供給する工程と、
を包含する方法。 - 前記外来物質が、ポリペプチド、核酸、色素および薬剤から成る群から選択される少なくとも1種の有機化合物である、請求項1に記載の方法。
- 前記外来物質が、前記キャリアペプチドフラグメントのC末端側に配置されている、請求項1または2に記載の方法。
- 前記構築物を導入する対象の真核細胞がヒトまたはヒト以外の哺乳動物の細胞である、請求項1または2に記載の方法。
- 以下のアミノ酸配列:
KKRTLRKSNSRKKR(配列番号1);
KKRTLRKSSNRKKR(配列番号2);
KKRTLRKSNNRKKR(配列番号3);および
KKRTLRKNSNRKKR(配列番号4);
のいずれかから成るキャリアペプチドフラグメントと、
前記キャリアペプチドフラグメントのN末端側及び/又はC末端側に結合した前記目的の外来物質と、
を有する構築物。 - 前記外来物質が、ポリペプチド、核酸、色素および薬剤から成る群から選択される少なくとも1種の有機化合物である、請求項5に記載の構築物。
- 前記外来物質が、前記キャリアペプチドフラグメントのC末端側に配置されている、請求項5または6に記載の構築物。
- 以下のアミノ酸配列:
KKRTLRKSNSRKKR(配列番号1);
KKRTLRKSSNRKKR(配列番号2);
KKRTLRKSNNRKKR(配列番号3);および
KKRTLRKNSNRKKR(配列番号4);
のいずれかから成る、キャリアペプチドフラグメント。
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2011013700A1 (ja) * | 2009-07-29 | 2011-02-03 | 東亞合成株式会社 | キャリアペプチドフラグメント及びその利用 |
| WO2011013699A1 (ja) | 2009-07-29 | 2011-02-03 | 東亞合成株式会社 | キャリアペプチドフラグメントとその利用 |
| JP2022047613A (ja) * | 2020-09-14 | 2022-03-25 | 東亞合成株式会社 | キャリアペプチドフラグメントおよびその利用 |
| JP2022105722A (ja) | 2017-06-30 | 2022-07-14 | 小林製薬株式会社 | ゴシツ加工物を含有する錠剤 |
| JP2023019098A (ja) * | 2021-07-28 | 2023-02-09 | 東亞合成株式会社 | 核小体移行性キャリアペプチドフラグメントおよびその利用 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2011013700A1 (ja) * | 2009-07-29 | 2011-02-03 | 東亞合成株式会社 | キャリアペプチドフラグメント及びその利用 |
| WO2011013699A1 (ja) | 2009-07-29 | 2011-02-03 | 東亞合成株式会社 | キャリアペプチドフラグメントとその利用 |
| JP2022105722A (ja) | 2017-06-30 | 2022-07-14 | 小林製薬株式会社 | ゴシツ加工物を含有する錠剤 |
| JP2022047613A (ja) * | 2020-09-14 | 2022-03-25 | 東亞合成株式会社 | キャリアペプチドフラグメントおよびその利用 |
| JP2023019098A (ja) * | 2021-07-28 | 2023-02-09 | 東亞合成株式会社 | 核小体移行性キャリアペプチドフラグメントおよびその利用 |
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| EP4549451A1 (en) | 2025-05-07 |
| US20250382331A1 (en) | 2025-12-18 |
| JPWO2024004599A1 (ja) | 2024-01-04 |
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