WO2022203000A1 - 抗原結合分子とストレプトアビジン変異体との融合タンパク質 - Google Patents
抗原結合分子とストレプトアビジン変異体との融合タンパク質 Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12N—MICROORGANISMS OR ENZYMES; COMPOSITIONS THEREOF; PROPAGATING, PRESERVING, OR MAINTAINING MICROORGANISMS; MUTATION OR GENETIC ENGINEERING; CULTURE MEDIA
- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/11—DNA or RNA fragments; Modified forms thereof; Non-coding nucleic acids having a biological activity
- C12N15/62—DNA sequences coding for fusion proteins
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
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- C12N15/00—Mutation or genetic engineering; DNA or RNA concerning genetic engineering, vectors, e.g. plasmids, or their isolation, preparation or purification; Use of hosts therefor
- C12N15/09—Recombinant DNA-technology
- C12N15/63—Introduction of foreign genetic material using vectors; Vectors; Use of hosts therefor; Regulation of expression
- C12N15/70—Vectors or expression systems specially adapted for E. coli
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- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12P—FERMENTATION OR ENZYME-USING PROCESSES TO SYNTHESISE A DESIRED CHEMICAL COMPOUND OR COMPOSITION OR TO SEPARATE OPTICAL ISOMERS FROM A RACEMIC MIXTURE
- C12P21/00—Preparation of peptides or proteins
- C12P21/02—Preparation of peptides or proteins having a known sequence of two or more amino acids, e.g. glutathione
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/48—Biological material, e.g. blood, urine; Haemocytometers
- G01N33/50—Chemical analysis of biological material, e.g. blood, urine; Testing involving biospecific ligand binding methods; Immunological testing
- G01N33/53—Immunoassay; Biospecific binding assay; Materials therefor
- G01N33/574—Immunoassay; Biospecific binding assay; Materials therefor for cancer
- G01N33/57484—Immunoassay; Biospecific binding assay; Materials therefor for cancer involving compounds serving as markers for tumor, cancer, neoplasia, e.g. cellular determinants, receptors, heat shock/stress proteins, A-protein, oligosaccharides, metabolites
- G01N33/57492—Immunoassay; Biospecific binding assay; Materials therefor for cancer involving compounds serving as markers for tumor, cancer, neoplasia, e.g. cellular determinants, receptors, heat shock/stress proteins, A-protein, oligosaccharides, metabolites involving compounds localized on the membrane of tumor or cancer cells
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- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K38/00—Medicinal preparations containing peptides
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- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07K—PEPTIDES
- C07K2319/00—Fusion polypeptide
- C07K2319/01—Fusion polypeptide containing a localisation/targetting motif
- C07K2319/10—Fusion polypeptide containing a localisation/targetting motif containing a tag for extracellular membrane crossing, e.g. TAT or VP22
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2333/00—Assays involving biological materials from specific organisms or of a specific nature
- G01N2333/435—Assays involving biological materials from specific organisms or of a specific nature from animals; from humans
- G01N2333/705—Assays involving receptors, cell surface antigens or cell surface determinants
- G01N2333/70596—Molecules with a "CD"-designation not provided for elsewhere in G01N2333/705
Definitions
- the present invention relates to fusion proteins of antigen-binding molecules and streptavidin mutants, and uses thereof.
- Patent Document 1 discloses streptavidin mutants with reduced affinity for native biotin, as well as biotin modifications with high affinity for this low-affinity streptavidin mutant for native biotin. Dimers have been reported.
- the problem to be solved in the present invention is to provide a fusion protein between a molecule that recognizes cancer cells and a streptavidin mutant for use in the treatment or diagnosis of cancer.
- a further object of the present invention is to provide a means for treating cancer or a means for diagnosing cancer using the fusion protein described above.
- the present inventor selected a molecule with a molecular weight smaller than that of an antibody as a molecule that recognizes cancer cells, and prepared a fusion protein between the above molecule and a streptavidin mutant. Then, the present inventors have found that photoimmunotherapy using the fusion protein and the conjugate of the biotin-modified dimer and the phthalocyanine dye can suppress the proliferation of cancer cells, thereby completing the present invention.
- ⁇ 2> From the N-terminal side to the C-terminal side, an antigen-binding molecule with a molecular weight of 20,000 or less, a linker sequence, and the amino acid sequence set forth in SEQ ID NO: 1 (provided that the C-terminal Pro-Ser-Ala-Ala-Ser 2.
- ⁇ 3> The fusion protein of ⁇ 1> or ⁇ 2>, wherein the antigen-binding molecule binds to an antigen expressed on cancer cells.
- ⁇ 4> The fusion protein of any one of ⁇ 1> to ⁇ 3>, wherein the antigen-binding molecule is a molecule that binds to Her2.
- ⁇ 5> The fusion protein of any one of ⁇ 1> to ⁇ 4>, wherein the antigen-binding molecule has the amino acid sequence of SEQ ID NO:2.
- ⁇ 6> The fusion protein according to any one of ⁇ 1> to ⁇ 5>, wherein the linker sequence consists of glycine and serine residues and has 5 to 25 amino acid residues.
- the linker sequence is an amino acid sequence represented by [(Gly) m -Ser] n (wherein m represents an integer of 1 to 10 and n represents an integer of 1 to 5) ⁇ 1 > to ⁇ 6>.
- the fusion protein according to any one of ⁇ 1> to ⁇ 7>, which has ⁇ 9>
- the amino acid sequence set forth in SEQ ID NO: 4 (however, the amino acid sequence consisting of C-terminal Pro-Ser-Ala-Ala-Ser His-His-His-His-His-His is partially or entirely deleted (optional).
- a cancer therapeutic agent or cancer diagnostic agent comprising the fusion protein according to any one of ⁇ 1> to ⁇ 8>.
- ⁇ 11> (1) the fusion protein according to any one of ⁇ 1> to ⁇ 8>, and (2) a compound represented by the following formula (1) or a salt thereof, and a diagnostic or therapeutic substance
- a cancer treatment or diagnostic kit comprising the conjugate.
- X1a, X1b, X2a and X2b each independently represent O or NH
- Y 1 and Y 2 each independently represent C or S
- Z 1 and Z 2 each independently represent O, S or NH
- V 1 and V 2 each independently represent S or S + -O -
- n1 and n2 each independently represent an integer of 0 or 1
- L 1 and L 2 each independently represent a divalent linking group
- L 3 is a group containing at its end a functional group capable of binding to a diagnostic or therapeutic substance
- L4 represents a trivalent linking group.
- the growth of cancer cells can be suppressed.
- FIG. 1 shows the results of tetramer purification by gel filtration.
- FIG. 2 shows the results of affinity measurement between FL and HER2.
- FIG. 3 shows the results of affinity measurement between FL and Psyche.
- FIG. 4 shows the results of a cytotoxicity assay with FL and the photosensitizer Psyche.
- FIG. 5 shows the results of a mouse tumor growth inhibition assay using FL and the photosensitizer Psyche.
- FIG. 6 shows the results of an in vivo experiment (treatment of subcutaneously implanted tumors) using FL and the photosensitizer Psyche.
- FIG. 7 shows the results of unwinding studies of FL2-G5Sx3-del5.
- FIG. 8 shows the results of confirmation of tetramer formation after unwinding.
- FIG. 1 shows the results of tetramer purification by gel filtration.
- FIG. 2 shows the results of affinity measurement between FL and HER2.
- FIG. 3 shows the results of affinity measurement between FL and Psych
- FIG. 10 shows a summary of treatment with Z HER2:342 -Cupid-His-Ax-SiPC for HER2-positive breast cancer.
- A shows a schematic of the pre-conjugate of Z HER2:342 -Cupid-His and Psyche-Ax-SiPC.
- the Z HER2:342 -Cupid-His structural model was predicted by Alphafold2.
- B shows the experimental schedule for xenograft model mice.
- FIG. 11 shows tumor volume before and after single dose treatment.
- A shows the tumor growth curves of the Kadcyla group (300 ⁇ g/body, filled circles) and the Z HER2:342 -Cupid-His-Ax-SiPC group (150 ⁇ g/body, filled squares).
- D shows representative animals bearing tumors after a single dose (left panel: Kadcyla group, right panel: Z HER2:342 -Cupid-His-Ax-SiPC group).
- Figure 12 shows the second administration of the Z HER2:342 -Cupid-His-Ax-SiPC repeat group.
- A shows the tumor growth curve after the second treatment with the same dose as the first treatment (150 ⁇ g/body and two light irradiations).
- B shows repeat group mice from day 1 to day 32 after the second treatment.
- C shows individual tumor volumes in the Kadcyla group (filled circles) and the Z HER2:342 -Cupid-His-Ax-SiPC group (filled squares) on day 97.
- Figure 13 shows the effect of Kadcyla on tumor eradication on histopathological examination.
- FIG. 14 shows the effect of tumor eradication by Z HER2:342 -Cupid-His-Psyche-Ax-SiPC complexes on histopathological examination.
- Z HER2:342 -Cupid-His-Psyche-Ax-SiPC shows histopathological analysis of skin and major organ tissues (liver, kidney, and lung) in xenograft model mice 97 days after treatment.
- Black scale bars with values ( ⁇ m) within each picture indicate the size of the historical picture.
- Figure 15 shows the time course of individual weights of the Kadcyla group (A) and the Z HER2:342 -Cupid-His-Ax-SiPC group (B) after initial treatment.
- the dotted line indicates the day of the second treatment of Z HER2:342 -Cupid-His-Ax-SiPC.
- the present invention will be described in more detail below.
- the fusion protein of the present invention has the amino acid sequence shown in SEQ ID NO: 1 (however, the amino acid sequence consisting of C-terminal Pro-Ser-Ala-Ala-Ser His-His-His-His-His-His (or C-terminal An amino acid sequence consisting of 6 histidines) may be partially or entirely deleted), via a linker sequence on the N-terminal side and/or C-terminal side, binding to an antigen with a molecular weight of 20,000 or less It is a fusion protein in which molecules are attached.
- the amino acid sequence set forth in SEQ ID NO: 1 (however, even if the amino acid sequence consisting of C-terminal Pro-Ser-Ala-Ala-Ser His-His-His-His-His-His-His-His is partially or entirely deleted, good), when antigen-binding molecules with a molecular weight of 20,000 or less are bound to both the N-terminal side and the C-terminal side via a linker sequence, the antigen-binding molecules may be the same or different.
- the fusion protein of the present invention comprises, from the N-terminal side to the C-terminal side, an antigen-binding molecule having a molecular weight of 20,000 or less, a linker sequence, and the amino acid sequence set forth in SEQ ID NO: 1 (provided that the C-terminal Pro- part or all of the amino acid sequence consisting of Ser-Ala-Ala-Ser His-His-His-His-His-His may be deleted) in this order.
- the amino acid sequence set forth in SEQ ID NO: 1 is the amino acid sequence of the streptavidin mutant, specifically, Example 3 of International Publication WO2015/125820 (SEQ ID NO: 4 of International Publication WO2015/125820) (this specification) is the streptavidin variant LISA314-V2122 described in SEQ ID NO: 1).
- the fusion protein of the present invention is a fusion protein between an antigen-binding molecule with a molecular weight of 20,000 or less and a streptavidin mutant.
- the fusion protein of the present invention forms a tetramer due to the affinity between the amino acid sequences set forth in SEQ ID NO:1.
- the molecular weight of the tetramer of the fusion protein of the present invention is about 96 kDa.
- the fusion protein of the present invention is administered to a living body to treat cancer, it must have good tumor uptake, good clearance rate, and It is important to simultaneously achieve good tumor penetration.
- the molecular weight of the tetramer described above in the present invention (approximately 96 kDa) is assumed to be the molecular weight that can simultaneously achieve the above three parameters.
- the molecular weight of the antigen-binding molecule may be 20,000 or less, and the molecular weight of the antigen-binding molecule is generally 4,000 or more and 20,000 or less, preferably 4,000 or more and 10,000 or less. , more preferably 4,000 or more and 8,000 or less.
- the antigen-binding molecule in the present invention is a molecule with a concept different from that of an antibody. While the molecular weight of IgG antibodies is usually about 150,000, antigen-binding molecules in the present invention are molecules with much smaller molecular weights than IgG antibodies.
- An antigen-binding molecule in the present invention may be a molecule that mimics an antibody.
- a molecule that binds to the desired antigen can be appropriately selected by screening from proteins with a molecular weight of about 6,000 that are prepared by partially modifying the IgG-binding domain of Protein A (VDNKFNKEQQNAFYEILHLPNLNEEQRNAFIQSLKDDPSQSANLLAEAKKLNDAQAPK) (SEQ ID NO: 9). can be done.
- the antigen in the antigen-binding molecule is not particularly limited, but is preferably an antigen expressed in cancer cells.
- Antigens that are specifically expressed in cancer include the following antigens.
- Epiregulin EREG
- ROBO1,2,3,4, 1-40- ⁇ -amyloid 4-1BB, 5AC, 5T4, ACVR2B, adenocarcinoma antigen, ⁇ -fetoprotein, angiopoietin 2, anthrax toxin, AOC3 ( VAP-1), B-lymphoma cells, B7-H3, BAFF, ⁇ -amyloid, C242 antigen, C5, CA-125, carbonic anhydrase 9 (CA-IX), cardiac myosin, CCL11 (eotaxin-1), CCR4 , CCR5, CD11, CD18, CD125, CD140a, CD147 (basigin), CD147 (basigin), CD15, CD152, CD154 (CD40L), CD154, CD19, CD2, CD20, CD200, CD22, CD221, CD23 (IgE receptor) , CD25 (IL-2 receptor ⁇ chain), CD28, CD3, CD30 (TNFRSF8), CD33, CD37, CD
- coli Shiga toxin type 1 E. coli Shiga toxin type 2, EGFL7, EGFR, endotoxin, EpCAM, episialin, ERBB3, Escherichia coli, respiration F protein of respiratory syncytial virus, FAP, fibrin II beta chain, fibronectin extra domain-B, folate receptor 1, Frizzled receptor, GD2, GD3 ganglioside, GMCSF receptor alpha chain, GPNMB, hepatitis B surface antigen, hepatitis B virus, HER1, HER2/neu, HER3, HGF, HIV-1, HLA-DR ⁇ , HNGF, Hsp90, human ⁇ -amyloid, human scatter factor receptor kinase, human TNF, ICAM-1 (CD54), IFN- ⁇ , IFN- ⁇ , IgE, IgE Fc region, IGF-1 receptor, IGF -I, IgG4, IGHE, IL-1 ⁇ , IL-12, IL-13,
- HER2 is particularly preferred.
- An example of an antigen-binding molecule is that it can bind to HER2.
- a protein having the amino acid sequence set forth in SEQ ID NO:2 can be mentioned.
- the linker sequence is not particularly limited as long as the effects of the present invention can be achieved, but the number of amino acids is preferably 5 to 25 amino acids, more preferably 10 to 25 amino acids, and even more preferably 15 to 20 amino acids.
- a specific example of the linker sequence is a sequence consisting of glycine and serine residues.
- an amino acid sequence represented by [(Gly) m -Ser] n (wherein m represents an integer of 1 to 10 and n represents an integer of 1 to 5) can be used. can.
- linker sequences include Gly-Gly-Gly-Gly-Gly-Ser-Gly-Gly-Gly-Gly-Gly-Ser-Gly-Gly-Gly-Gly-Gly-Gly-Gly-Ser. Not limited.
- a specific example of the fusion protein of the present invention is the amino acid sequence shown in SEQ ID NO: 4 (provided that the amino acid sequence consisting of C-terminal Pro-Ser-Ala-Ala-SerHis-His-His-His-His-His-His-His-His is may be partially or wholly deleted).
- the present invention further provides a nucleic acid (eg, DNA) encoding the fusion protein of the present invention described above.
- a specific example of the nucleic acid of the present invention is the amino acid sequence set forth in SEQ ID NO: 4 (provided that the amino acid sequence consisting of Pro-Ser-Ala-Ala-SerHis-His-His-His-His-His-His at the C-terminal is part or all of which may be deleted).
- An example of the nucleic acid of the present invention is a nucleic acid having the nucleotide sequence set forth in SEQ ID NO:3.
- a nucleic acid (eg, DNA) encoding the fusion protein of the present invention can be used by incorporating it into a vector.
- the fusion protein of the present invention can be expressed by incorporating a nucleic acid encoding the fusion protein of the present invention into an expression vector and transforming the expression vector into a host. . That is, the present invention provides a method for producing the fusion protein of the present invention, comprising the step of expressing a nucleic acid encoding the fusion protein of the present invention in a host.
- the fusion protein is preferably expressed and recovered in bacterial inclusion bodies.
- the vector When E. coli is used as a host, the vector has an origin of replication (ori) and a gene for selecting a transformed host (for example, a drug such as ampicillin, tetracycline, kanamycin or chloramphenicol). It is preferable to have a drug resistance gene against In the case of an expression vector, it preferably has a promoter such as the lacZ promoter or T7 promoter that allows efficient expression of the streptavidin mutant of the present invention in the host.
- a promoter such as the lacZ promoter or T7 promoter that allows efficient expression of the streptavidin mutant of the present invention in the host.
- vectors examples include M13-based vectors, pUC-based vectors, pBR322, pBluescript, pCR-Script, pGEX-5X-1 (Pharmacia), "QIAexpress system” (Qiagen), pEGFP, or pET (In this case, it is preferable to use BL21 expressing T7 RNA polymerase as the host).
- a tag for improving solubility such as a sequence encoding glutathione-S-transferase, thioredoxin, or maltose binding protein, may be added. It also encodes tags designed to facilitate purification, such as polyhistidine tags, Myc epitopes, hemagglutinin (HA) epitopes, T7 epitopes, Xpress tags, FLAG peptide tags, and other known tag sequences. A sequence may be added.
- mammalian-derived expression vectors e.g., pcDNA3 (manufactured by Invitrogen), pEGF-BOS (Nucleic Acids. Res. 1990, 18(17), p5322), pEF, pCDM8), insect cell-derived expression vectors (e.g., "Bac-to-BAC baculovairus expression system” (manufactured by Gibco BRL), pBacPAK8), plant-derived expression vectors (e.g., pMH1, pMH2), animal virus-derived expression vectors (e.g., pHSV, pMV, pAdexLcw), retrovirus-derived expression vectors (e.g., pZIPneo), yeast-derived expression vectors (e.g., "Pichia Expression Kit” (manufactured by Invitrogen), pNV11, SP-Q01), Bacillus subtilis-derived expression vectors (e.g., pcDNA3
- a promoter necessary for intracellular expression such as the SV40 promoter (Muligan et al., Nature (1979) 277, 108), It is essential to have MMLV-LTR promoter, EF1 ⁇ promoter (Mizushima et al., Nucleic Acids Res. (1990) 18, 5322), CMV promoter, etc., and genes for selecting transformation into cells (for example, It is more preferable to have a drug resistance gene that can be identified by a drug (neomycin, G418, etc.). Vectors with such properties include, for example, pMAM, pDR2, pBK-RSV, pBK-CMV, pOPRSV, pOP13, and the like.
- the host cell into which the vector is introduced is not particularly limited, and may be either prokaryotic or eukaryotic.
- E. coli and various animal cells can be used.
- animal cells for example, animal cells, plant cells, and fungal cells can be used as hosts.
- animal cells mammalian cells such as CHO cells, COS cells, 3T3 cells, HeLa cells, Vero cells, or insect cells such as Sf9, Sf21 and Tn5 can be used.
- animal cells CHO cells are particularly preferred for the purpose of large-scale expression.
- a vector can be introduced into a host cell by, for example, calcium phosphate method, DEAE dextran method, method using cationic ribosome DOTAP (manufactured by Boehringer Mannheim), electroporation method, lipofection and the like.
- Nicotiana tabacum-derived cells are known as a protein production system, and callus can be cultured from these cells.
- Known fungal cells include yeast, e.g., Saccharomyces genus, e.g., Saccharomyces cerevisiae, filamentous fungi, e.g., Aspergillus genus, e.g., Aspergillus niger. .
- Escherichia coli such as JM109, DH5 ⁇ , HB101, etc., and Bacillus subtilis are known.
- the fusion protein of the present invention can be obtained by transforming these cells with the nucleic acid of the present invention and culturing the transformed cells in vitro.
- Culture can be performed according to a known method.
- DMEM, MEM, RPMI1640, and IMDM can be used as animal cell culture media.
- a serum replacement fluid such as fetal calf serum (FCS) can be used in combination, or serum-free culture can be performed.
- FCS fetal calf serum
- the pH during culture is preferably about 6-8. Cultivation is usually carried out at about 30-40° C. for about 15-200 hours, and medium replacement, aeration and agitation are added as necessary.
- growth factors may be added to promote cell growth.
- the fusion protein of the present invention is useful as a cancer therapeutic agent or cancer diagnostic agent.
- cancer comprising (1) the fusion protein of the present invention, and (2) a conjugate of a compound or a salt thereof represented by formula (1) described later and a diagnostic or therapeutic substance
- a therapeutic or diagnostic kit for is provided.
- the fusion protein of the present invention When a molecule that binds to an antigen present on cancer cells is used as the antigen-binding molecule, administration of the fusion protein of the present invention to a patient enables specific accumulation of streptavidin mutants in cancer cells. can be done. Next, by administering to the patient a conjugate of a biotin-modified dimer having affinity for a streptavidin variant and a diagnostic or therapeutic substance, the diagnostic or therapeutic substance is precisely delivered to cancer cells. It is possible to accumulate.
- a complex is prepared by binding "the fusion protein of the present invention" and "a conjugate of a biotin-modified dimer having affinity for a streptavidin variant and a diagnostic or therapeutic substance". , this complex can also be administered to a patient.
- the biotin-modified dimer is a compound represented by the following formula (1) or a salt thereof, preferably a compound represented by the following formula (2) or a salt thereof.
- a biotin-modified dimer can use the compound described in International Publication WO2015/125820.
- X1a, X1b, X2a and X2b each independently represent O or NH
- Y 1 and Y 2 each independently represent C or S
- Z 1 and Z 2 each independently represent O, S or NH
- V 1 and V 2 each independently represent S or S + -O -
- n1 and n2 each independently represent an integer of 0 or 1
- L 1 and L 2 each independently represent a divalent linking group
- L 3 is a group terminating with a functional group that can bind to a diagnostic or therapeutic substance (e.g., a phthalocyanine dye)
- L4 represents a trivalent linking group.
- X1a , X1b , X2a and X2b denote NH
- Y1 and Y2 denote C
- Z1 and Z2 denote NH
- V1 and V2 denote S is preferred.
- L 4 represents a trivalent linking group, preferably or (trivalent linking group or nitrogen atom derived from benzene).
- L 3 is preferably a group consisting of a combination of groups selected from -CONH-, -NHCO-, -COO-, -OCO-, -CO-, -O-, and an alkylene group having 1 to 10 carbon atoms and is a group further containing an amino group at its end.
- a conjugate of a biotin-modified dimer and a diagnostic or therapeutic substance can be prepared by binding a diagnostic or therapeutic substance to the biotin-modified dimer.
- Diagnostic or therapeutic substances include fluorescent dyes, chemiluminescent agents, radioisotopes, sensitizers composed of metal compounds and the like, neutron capture agents composed of metal compounds and the like, phthalocyanine dyes, low-molecular-weight compounds, micro- or nanobubbles, Proteins and the like can be mentioned. Phthalocyanine dyes can preferably be used.
- phthalocyanine dye specifically, a compound represented by the following formula (1) or a salt thereof can be used.
- X represents a substituent having a hydrophilic group at its end.
- hydrophilic group a sulfonic acid group, a phosphoric acid group, an ammonium group and the like are preferable.
- X is preferably a substituent having a terminal sulfonic acid group.
- X is A group represented by can be mentioned.
- Me represents a methyl group.
- L 3 , L 4 , L 5 and L 6 each independently represent a divalent linking group.
- L3 is preferably (Wherein, m represents an integer of 1 to 5.) is.
- L 4 is preferably -[(CH 2 ) p -O)] q - (Wherein, p and q each independently represent an integer of 1 to 5.) is.
- L 5 is preferably -CONH-, -NHCO-, -COO- or -OCO-, more preferably -CONH-.
- L 6 is preferably -(CH 2 ) r -, -(CH 2 ) r -O-, or -(CH 2 ) r -Si(R 1 )(R 2 )-O- (where r represents an integer of 1 to 5.
- R 1 and R 2 each independently represent an alkyl group having 1 to 4 carbon atoms.) is.
- R 1 and R 2 are particularly preferably methyl radicals.
- Y represents a group that can bind to an antigen-binding molecule.
- Y is preferably an active ester of a carboxyl group, more preferably a succinimidyl ester of a carboxyl group.
- R 3 is an alkyl group having 1 to 6 carbon atoms, an alkoxy group having 1 to 6 carbon atoms, a halogen atom, —SR 11 , —SOR 12 , an aryl group having 6 to 10 carbon atoms, —N(R 13 )(R 14 ), or represents —NO 2 , or two adjacent R 3 may together form an aryl group having 6 to 10 carbon atoms.
- R 11 , R 12 , R 13 and R 14 each independently represent an alkyl group having 1 to 6 carbon atoms or an alkoxy group having 1 to 6 carbon atoms.
- the aryl group may be substituted with an alkyl group having 1 to 6 carbon atoms or an alkoxy group having 1 to 6 carbon atoms.
- the alkyl group and alkoxy group may be substituted with a halogen atom.
- each may be the same or different.
- s represents an integer of 0-4. Preferably s is zero.
- the halogen atom may be fluorine, chlorine, bromine or iodine, preferably fluorine, chlorine or bromine.
- the phthalocyanine dye compound can be synthesized according to the methods described in Production Examples 1 to 5 of the Examples.
- Photoimmunotherapy is a treatment that uses photosensitizers and irradiated light to destroy specific cells in the body.
- Photosensitizers produce cytotoxic reactive oxygen species that can induce apoptosis, necrosis, and/or autophagy in nearby cells when exposed to specific wavelengths of light.
- 6,127,045 discloses a method of killing cells comprising contacting cells containing cell surface proteins with a therapeutically effective amount of one or more antibody-IR700 molecules, wherein the antibodies are specifically binding to a cell surface protein; irradiating said cells at a wavelength of 660-740 nm and a dose of at least 1 Jcm ⁇ 2 ; and approximately 0-8 hours after irradiating said cells, with one or more therapeutic agents, thereby killing the cell.
- 2017-524659 discloses a method for inducing cytotoxicity in a subject suffering from a disease or condition, comprising: (a) IRDye (registered trademark) conjugated to a probe that specifically binds to the cells of the subject; ) administering to said subject a therapeutically effective agent comprising a phthalocyanine dye such as 700DX; and (b) irradiating said cells with a suitable excitation light in an amount effective to induce cell death.
- IRDye registered trademark
- a therapeutically effective agent comprising a phthalocyanine dye such as 700DX
- irradiating said cells with a suitable excitation light in an amount effective to induce cell death.
- administering the fusion protein of the present invention and a conjugate of a biotin-modified dimer and a phthalocyanine dye to a subject, and irradiating the cells with excitation light in an amount effective to inhibit cell growth or induce cell death; can inhibit cell proliferation or induce cell death to treat a subject.
- a fusion protein of the invention and a conjugate of a biotin-modified dimer and a phthalocyanine dye are administered to a subject, and the cells are exposed to excitation light in an amount effective to inhibit cell proliferation or induce cell death. Irradiation can induce inhibition of cell proliferation or cell death to treat a subject.
- Subjects include humans and non-human mammals, including humans, or experimental animals such as mice.
- the subject is preferably a subject suffering from a disease for which suppression of cell proliferation or induction of cell death is desired, and examples thereof include subjects having cancer or solid tumors.
- Cancer includes carcinoma, lymphoma, blastoma, sarcoma, and leukemia or malignant lymphoma.
- Specific examples of cancers include squamous cell carcinoma (e.g. epithelial squamous cell carcinoma), lung cancer including small cell lung cancer, non-small cell lung cancer (“NSCLC”), lung adenocarcinoma and squamous cell carcinoma of the lung, peritoneal cancer, hepatocellular carcinoma, gastric cancer including gastrointestinal cancer, pancreatic cancer, glioblastoma, cervical cancer, ovarian cancer, liver cancer, bladder cancer, hepatocellular carcinoma, breast cancer, colon cancer, rectum cancer, colorectal cancer, endometrial or uterine carcinoma, salivary gland carcinoma, kidney or renal carcinoma, prostate cancer, vulvar cancer, thyroid cancer, hepatocellular carcinoma, anal carcinoma, penile carcinoma, and head and neck cancer.
- squamous cell carcinoma e.g. epithelial squamous cell carcinoma
- a solid tumor is an abnormal mass of cells, benign or malignant, that usually does not contain a cyst.
- Solid tumors include glioma, astrocytoma, medulloblastoma, craniopharyngioma, ependymoma, pineocytoma, hemangioblastoma, acoustic neuroma, oligodendroglioma, meningioma, melanoma, Neuroblastoma, and retinoblastoma.
- Administration methods to subjects include topical routes, injections (subcutaneous injections, intramuscular injections, intradermal injections, intraperitoneal injections, intratumoral injections, intravenous injections, etc.), oral routes, ocular routes, sublingual routes, and rectal routes. Routes include, but are not limited to, transdermal, intranasal, vaginal, and inhalation routes.
- the biotin-modified dimer-phthalocyanine dye conjugate and the fusion protein of the invention are each preferably administered in therapeutically effective amounts.
- a therapeutically effective amount is at least 0.5 milligrams per 60 kilograms (mg/60kg), at least 5mg/60kg, at least 10mg/60kg, at least 20mg/60kg, at least 30mg/60kg, for each of the above conjugates and fusion proteins; At least 50 mg/60 kg.
- the therapeutically effective amount is at least 10 ⁇ g/kg, such as at least 100 ⁇ g/kg, at least 500 ⁇ g/kg or at least 500 ⁇ g/kg, for example 100 ⁇ g/kg, 250 ⁇ g/kg when administered intratumorally or intraperitoneally. kg, such as doses of about 500 ⁇ g/kg, 750 ⁇ g/kg, or 1000 ⁇ g/kg, eg, 10 ⁇ g/kg to 1000 ⁇ g/kg.
- the therapeutically effective amount is 10 ⁇ g/ml, 20 ⁇ g/ml, 30 ⁇ g/ml, 40 ⁇ g/ml, 50 ⁇ g/ml, 60 ⁇ g/ml, 70 ⁇ g/ml, 80 ⁇ g/ml, 90 ⁇ g/ml administered in a topical solution. , or at least 1 ⁇ g/ml, such as at least 500 ⁇ g/ml, such as between 20 ⁇ g/ml and 100 ⁇ g/ml, such as 100 ⁇ g/ml.
- the doses described above can be administered in one or more divided doses (such as 2, 3, or 4 doses) or in a single formulation.
- Conjugates of biotin-modified dimers and phthalocyanine dyes and fusion proteins of the invention can each be administered alone or in the presence of a pharmaceutically acceptable carrier, and other treatments. It can also be administered in the presence of agents (such as other anticancer agents).
- Conjugates of biotin-modified dimers and phthalocyanine dyes and fusion proteins of the invention can bind to target cells or tissues, such as circulating tumor cells or cells of solid tumors. Upon subsequent irradiation with light, the conjugate or complex can absorb the light and damage or destroy the target cell or tissue.
- the wavelength of irradiation light in photoimmunotherapy is preferably 660 to 740 nm, for example, 660 nm, 670 nm, 680 nm, 690 nm, 700 nm, 710 nm, 720 nm, 730 nm, or 740 nm.
- Light irradiation may be performed by using a device with near-infrared (NIR) light emitting diodes.
- NIR near-infrared
- the dose of light is at least 1 J/cm 2 , such as at least 4 J/cm 2 , at least 10 J/cm 2 , at least 15 J/cm 2 , at least 20 J/cm 2 , at least 50 J/cm 2 , or at least 100 J/cm 2 . , for example, from 1 to 500 J/cm 2 .
- Light irradiation may be performed multiple times (eg, 2, 3, 4, 5, 6, 7, 8, 9, or 10 times).
- 1,3-Propanesultone (86.2 mg, 707 ⁇ mol), diisopropylethylamine (DIPEA, 137 mg, 1.06 mmol) and methanol (3 mL) were added to compound 4 (22.2 mg, 22.1 ⁇ mol), and the mixture was shielded with aluminum foil. Stirred at 50°C. 1,3-Propanesultone (86.2 mg, 707 ⁇ mol) and DIPEA (137 mg, 1.06 mmol) were both added on the 7th and 10th days after initiation of the reaction.
- DIPEA diisopropylethylamine
- N,N'-Disuccinimidyl carbonate (DSC, 1.7 mg, 6.8 ⁇ mol), Et 3 N (1.4 mg, 14 ⁇ mol), dehydrated dimethyl sulfoxide (500 ⁇ L) were added to compound 6 (2.3 mg, 1.3 ⁇ mol) and wrapped in aluminum foil. The mixture was shielded from light and stirred at room temperature for 14 hours. Precipitation was generated by adding diethyl ether (50 mL) to the reaction solution, and compound 7 was obtained by washing the precipitate with diethyl ether (50 mL) after removing the supernatant. This compound was directly used for the next reaction without column purification.
- a Cupid molecule (SEQ ID NO: 1) (International Publication WO2015/125820) and a molecule that recognizes the HER2 antigen (Lofblom, J. FEBS Lett. 584(12):2670-80(2010)) (SEQ ID NO: 2) are fused, A Psyche molecule (Psyche J described above) and a protein (hereinafter referred to as FL) having binding properties to both Her2/ErbB2 were synthesized in E. coli.
- the FL gene sequence (SEQ ID NO: 3) was artificially synthesized by Eurofins (SEQ ID NO: 4).
- an expression vector was constructed according to a standard method. Specifically, the vector was linearized by PCR using a primer set (Rv: catggtatatctccttctttaaagttaac (SEQ ID NO: 5), Fw: cgcagcttaattaacctaggctgctgccac (SEQ ID NO: 6)).
- the sequence prepared by artificial gene synthesis was amplified by PCR using a primer set (Fw: aggagatataccatgGTGGACAACAAATTCAACAAAGAG (SEQ ID NO: 7), Rv: gttaattaagctgcgTTAATGATGGTGGTGATGATGCGATG (SEQ ID NO: 8)). Both PCR products were subjected to agarose gel electrophoresis to cut out bands and purify them. The ligation reaction of the purified vector and the insert was performed using the In-Fusion HD Cloning Kit (TaKaRa Bio) according to the usage volume of the manual.
- Competent cells BL21 (DE3) (ECOS Competent E.coli BL21 (DE3), Nippon Gene) were transformed with a plasmid vector that was confirmed to contain the target gene by cloning and sequence analysis.
- rice field 100 mL of 2xYT medium cultured overnight was phagocytosed into 1 liter of culture medium and cultured at 37°C. IPTG was added so as to obtain the desired amount, culture was performed at 37°C for 4 hours, and then the cells were collected by centrifugation (7500 xg, 20 min at 4°C).
- the method for collecting IB from bacterial cells is shown below.
- the recovered IB is resuspended in 10-fold diluted B-PER buffer (no Benzonase added), centrifuged, discarded the supernatant, and the IB washed 3 times.After 3 washes, recovered by centrifugation.
- the obtained IB was resuspended in ultrapure water (MilliQ), dispensed into 1.5 mL tubes in 1 mL portions, and stored frozen at -80°C.
- the denaturation and unwinding of IB are shown below.
- Add denature buffer (6 M guanidium HCl, 200 mM NaCl, 50 mM Tris-HCl, 1 mM EDTA; pH 8.0 at 4°C) to IB and dissolve by pipetting. It was incubated overnight and centrifuged (15,000 x g, 20 min at 4°C) to collect the supernatant.
- Dilution buffer PBS or 200 mM NaCl, 50 mM Tris-HCl, 1 mM EDTA; pH 8.0 at 4 °C
- a 500-fold dilution of the denatured protein solution whose concentration had been adjusted was added dropwise. After that, it was incubated at 4° C.
- ⁇ FL performance evaluation> The purified FL was analyzed for binding activity to HER2 (ErbB2) using SPR (BiacoreT200, Cytiva).
- Her2 antigen Recombinant Human ErbB2/Her2 Fc Chimera Protein, R&D SYSTEMS
- Sensor Chip CM5 Chip CM5 (Cytiva) by the amine coupling method (Amine Coupling Kit, Cytiva).
- binding activity was measured using FL dilution series (2-fold dilution series from 1E-08 M to 6.25E-10 M). The implementation result is shown in FIG. From the results, it was confirmed that stable binding was exhibited.
- the purified FL was analyzed for its binding activity with Psyche using SPR (BiacoreT200, Cytiva). FL was immobilized on Sensor Chip CM5 (Cytiva) by amine coupling method, and analysis of binding activity with Psyche dilution series (2-fold dilution series from 1E-08 M to 6.25E-10 M, 5 series) as analyte. was performed by the single cycle kinetics method. The implementation result is shown in FIG. From the results, it was confirmed that stable binding was exhibited.
- ⁇ Cytotoxic activity using FL and photosensitizer Psyche> Her2-positive cells (SK-BR-3, KPL- 4 ) were seeded in a 96-well plate at a cell number of 1 x 104 cells/well and a culture solution of 50 ⁇ L/well, and cultured overnight.
- FL and photosensitizer Psyche (compound 8 produced in Production Example 6 above) were mixed so that the molar ratio was 1:2 (hereinafter referred to as the complex), and a 2-fold dilution series from 10 ⁇ g / mL 12 series were produced.
- the complex was added to the cells, and 24 hours later, light was irradiated from the bottom of the culture plate with an LED that emits light of 690 nm at 100 J/cm 2 . After that, the cells were cultured for 24 hours and the number of living cells was compared using Cell Counting Kit-8 (Dojindo Laboratories). According to the instruction manual, add reagents and incubate in a CO 2 incubator at 37°C for 1.5 hours, then measure absorbance at 450 nm, calculate the average value, and after correcting the background, set the control as 100%, then divide the cells against the control for each condition. Percentage of proliferation was calculated. The implementation result is shown in FIG. It was confirmed that the complex of FL and a photosensitizer Psyche compound has concentration-dependent cytotoxicity.
- mice with tumor masses of 50 to 200 mm 3 in volume were administered a complex of FL and a photosensitizer Psyche at 75 to 150 ⁇ g/body via the tail vein.
- Herceptin Choi Pharmaceutical Co., Ltd.
- the body weight and the volume of the tumor mass were measured. Specifically, the volume of the tumor mass was measured by measuring the major axis and minor axis of the tumor mass with a vernier caliper, and the value calculated by the formula: (minor axis) 2 ⁇ major axis ⁇ 1/2 was taken as the volume of the tumor mass.
- the implementation result is shown in FIG. A complex of FL and a photosensitizer Psyche compound was confirmed to have tumor growth inhibitory effects.
- the body weight and the volume of the tumor mass were measured. Specifically, the volume of the tumor mass was measured by measuring the major axis and minor axis of the tumor mass with a vernier caliper, and the value calculated by the formula: (minor axis) 2 ⁇ major axis ⁇ 1/2 was taken as the volume of the tumor mass. As shown in FIGS. 6B and 6C, tumor regression was observed immediately after light irradiation, and after 14 weeks, the tumor disappeared and the skin scars disappeared, confirming the therapeutic effect.
- a primer set (Fw; AAGTCAAATAACGCAGCTTAATTAACCTAG (SEQ ID NO: 11), Rw; TGCGTTATTTGACTTTGGTAAAGGTGTCATG (SEQ ID NO: 12)) was used, and the expression vector was used as a template for PCR reaction. Thereafter, the reaction solution was treated with DpnI at 37° C. for 1 hour, and E. coli was transformed with the reaction solution for cloning. After cloning, sequence analysis was performed to confirm that the gene sequence described in SEQ ID NO: 13 was incorporated, and the vector was named pET45-FL2-G5Sx3-del5.
- expression vectors with different amino acid linker lengths that connect the HER2 antigen-recognizing molecule in FL2-G5Sx3-del5 and Cupid-del5.
- expression vectors were prepared having a peptide consisting of a combination of 4 glycines and 1 serine as a basic unit, and linkers of lengths of 1 unit, 2 units, and 3 units.
- the manufacturing method is as follows.
- pET45-FL2-G5Sx3-del5 was linearized with a primer set (Fw: GCGGAAGCCGGTATTACCGGGACCTGGTC (SEQ ID NO: 14), Rw: TTTCGGAGCTTGAGCATCATTCAGTTTC (SEQ ID NO: 15)).
- Complementary oligos were synthesized as follows so as to express amino acid linkers of each length, reacted at 95° C. for 10 minutes, and annealed by natural cooling.
- Oligo for 1 unit of linker Fw GAAACTGAATGATGCTCAAGCTCCGAAAGGAGGCGGAGGGTCTGCGGAAGCCGGTATTACCGGGACCTGGTC (SEQ ID NO: 16)
- Rv GACCAGGTCCCGGTAATACCGGCTTCCGCAGACCCTCCGCCTCCTTTCGGAGCTTGAGCATCATTCAGTTTC (SEQ ID NO: 17)
- Oligo for linker 2 units Fw:GCTCAAGCTCCGAAAGGAGGCGGAGGGTCTGGAGGTGGCGGTTCAGCGGAAGCCGGTATT (SEQ ID NO: 18) Rv: AATACCGGCTTCCGCTGAACCGCCACCTCCAGACCCTCCGCCTCCTTTCGGAGCTTGAGC (SEQ ID NO: 19)
- Oligo for linker 3 units Fw:GCTCAAGCTCCGAAAGGAGGCGGAGGGTCTGGAGGTGGCGGTTCAGGTGGCGGTGGCAGTGCGGAAGCCGGTATT (SEQ ID NO: 20) Rv: AATACCGGCTTCCGCACTGCCACCGCCACCTGAACCGCCACCTCCAGACCCTCCGCCTCCTTTCGGAGCTTGAGC (SEQ ID NO: 21)
- the ligation reaction of the purified vector and the annealed oligo was performed according to the usage volume of the instruction manual. It was confirmed that the gene sequences (SEQ ID NOS: 25, 26, 27) that express the proteins having the linker lengths described in SEQ ID NOS: 22, 23, and 24 were incorporated.
- the resulting expression vectors were named pET45-FL2-G4Sx1-del5, pET45-FL2-G4Sx2-del5 and pET45-FL2-G4Sx3-del5, respectively.
- the method for collecting IB from bacterial cells is shown below.
- the recovered IB is resuspended in 10-fold diluted B-PER buffer (no Benzonase added), centrifuged, discarded the supernatant, and the IB washed 3 times.After 3 washes, recovered by centrifugation.
- the obtained IB was resuspended in ultrapure water (MilliQ), dispensed into 1.5 mL tubes in 1 mL portions, and stored frozen at -80°C.
- IB The denaturation and unwinding of IB are shown below. Add denature buffer (0.1 M Tris-HCl, pH 8.5, 6 M guanidine hydrochloride, 10 mM EDTA) to IB, dissolve by pipetting, incubate overnight at 4°C while stirring with a rotator, and centrifuge (15,000 x g, 20 min at 4°C) and the supernatant was collected.
- denature buffer 0.1 M Tris-HCl, pH 8.5, 6 M guanidine hydrochloride, 10 mM EDTA
- the protein concentration (OD280nm) of the recovered supernatant was adjusted to 30-50 mg/mL with denature buffer, and diluted with dilution buffer (PBS or 200 mM NaCl, 50 mM Tris-HCl, 1 mM EDTA; pH 8.0 at 4°C), a 500-fold dilution of the denatured protein solution whose concentration had been adjusted was added dropwise. After that, it was incubated at 4° C. for 24 to 48 hours and purified with a Ni-NTA column (cOmplete, Merck).
- dilution buffer PBS or 200 mM NaCl, 50 mM Tris-HCl, 1 mM EDTA; pH 8.0 at 4°C
- Her2-positive cells were seeded in a 96-well plate at a cell number of 1 ⁇ 10 4 cells/well and a culture solution of 50 ⁇ L/well, and cultured overnight.
- SEQ ID NO: 1 (Cupid amino acid sequence) AEAGITGTWSDQLGDTFIVTAGADGALTGTYENAVGGAESRYVLTGRYDSAPATDGSGTALGWTVAWKNNSKNAHSATTWSGQYVGGADAKINTQWLLTSGTTNANAWKSTLVGHDTFTKVKPSAASHHHHHH
- SEQ ID NO: 2 (HER2 recognition protein amino acid sequence) VDNKFNKEMRNAYWEIALLPNLNNQQKRAFIRSIYDDPSQSANLLAEAKKLNDAQAPK
- SEQ ID NO: 4 (FL amino acid sequence) MVDNKFNKEMRNAYWEIALLPNLNNQQKRAFIRSIYDDPSQSANLLAEAKKLNDAQAPKSGGGGGSGGGGGSGGGGGSAEAGITGTWSDQLGDTFIVTAGADGALTGTYENAVGGAESRYVLTGRYDSAPATDGSGTALGWTVAWKNNSKNAHSATTWSGQYVGGADAKINTQWLLTSGTTNANAWKSTLVGHDTFTKVKPSAASHHHHHH
- SEQ ID NO: 10 (FL2-G5Sx3-del5 amino sequence) MVDNKFNKEMRNAYWEIALLPNLNNQQKRAFIRSIYDDPSQSANLLAEAKKLNDAQAPKSGGGGGSGGGGGSGGGGGSAEAGITGTWSDQLGDTFIVTAGADGALTGTYENAVGGAESRYVLTGRYDSAPATDGSGTALGWTVAWKNNSKNAHSATTWSGQYVGGADAKINTQWLLTSGTTNANAWKSTLVGHDTFTKVK
- SEQ ID NO: 22 (FL2-G4Sx1-del5 amino acid sequence) MVDNKFNKEMRNAYWEIALLPNLNNQQKRAFIRSIYDDPSQSANLLAEAKKLNDAQAPKGGGGSAEAGITGTWSDQLGDTFIVTAGADGALTGTYENAVGGAESRYVLTGRYDSAPATDGSGTALGWTVAWKNNSKNAHSATTWSGQYVGGADAKINTQWLLTSGTTNANAWKSTLVGHDTFTKVK
- SEQ ID NO: 23 (FL2-G4Sx2-del5 amino acid sequence) MVDNKFNKEMRNAYWEIALLPNLNNQQKRAFIRSIYDDPSQSANLLAEAKKLNDAQAPKGGGGSGGGGSAEAGITGTWSDQLGDTFIVTAGADGALTGTYENAVGGAESRYVLTGRYDSAPATDGSGTALGWTVAWKNNSKNAHSATTWSGQYVGGADAKINTQWLLTSGTTNANAWKSTLVGHDTFTKVK
- SEQ ID NO: 24 (FL2-G4Sx3-del5 amino acid sequence) MVDNKFNKEMRNAYWEIALLPNLNNQQKRAFIRSIYDDPSQSANLLAEAKKLNDAQAPKGGGGSGGGGSGGGGSAEAGITGTWSDQLGDTFIVTAGADGALTGTYENAVGGAESRYVLTGRYDSAPATDGSGTALGWTVAWKNNSKNAHSATTWSGQYVGGADAKINTQWLLTSGTTNANAWKSTLVGHDTFTKVK
- the photosensitizer Psyche-Ax-SiPC is Compound 8 produced in Production Example 6 above (Yamatsugu K, Katoh H, Yamashita T, et al. Antibody mimetic drug conjugate manufactured by high-yield Escherichia coli expression and non -covalent binding system. Protein Expr Purif. 2022;192:106043. doi:10.1016/j.pep.2021.106043; and Takahashi K, Sugiyama A, Ohkubo K, et al. 2021;32:1098-1103. doi:10.1055/a-1503-6425). Human breast cancer KPL-4 cells were provided by Professor Kurebayashi (Kawasaki Medical School, Kurashiki, Japan). Kadcyla (trastuzumab emtansine) was purchased from Roche (Basel, Switzerland).
- Recombinant Z HER2:342 -Cupid-His protein is the same as described in ⁇ Method for preparing HER2 recognition protein> above, and is produced from E. coli inclusion bodies by denaturation using a denaturant and direct dilution refolding method. It is what I did.
- the expression and purification of the recombinant Z HER2:342 -Cupid-His protein has been described in detail previously (Sugiyama A, Kawamura T, Tanaka T, et al. Cupid and Psyche system for the diagnosis and treatment of advanced cancer.
- E. coli strain BL21(DE3) was transformed with the expression vector pET45b(+)-Z HER2:342 -Cupid-His and the recombinant Z HER2:342 -Cupid-His protein was delivered as inclusion bodies (IBs). expressed.
- Purified IB was solubilized in denaturation buffer.
- the solubilized IB solution was clarified using centrifugation (12,000 ⁇ g, 15 min at 4° C.) and refolded using a direct 40-fold dilution in refolding buffer.
- KPL-4 cell line was cultured in DMEM (low glucose) (FUJIFILM Wako Pure Chemical Corporation, Osaka, Japan) with 10% FBS, 100 U/mL penicillin, and 100 ⁇ g/mL streptomycin (#15140122, Thermo Fisher Scientific, USA).
- DMEM low glucose
- FBS penicillin
- streptomycin #15140122, Thermo Fisher Scientific, USA.
- KPL-4 cells (7.5 million) were subcutaneously implanted into the thighs of BALB/cSlc-nu/nu nude mice (Sankyo Lab Service Co., Ltd., Tokyo, Japan). Subcutaneous tumor growth was monitored by measuring tumor volume (0.5 ⁇ length ⁇ width 2 ) using vernier calipers, and animal body weight was monitored as an index of treatment-related toxicity. Tumor size in 20 mice increased 44 days after implantation, reaching approximately 400 mm 3 . These 20 mice were randomly sorted into two groups of 10 mice each, the Kadcyla® group and the Z HER2:342 -Cupid-His-Ax-SiPC group.
- FIG. 10A shows a schematic of the experimental design.
- Kadcyla® was made according to the manufacturer's instructions.
- the preparation of Z HER2:342 -Cupid-His and Psyche-Ax-SiPC has already been reported (Yamatsugu K, Katoh H, Yamashita T, et al. Antibody mimetic drug conjugate manufactured by high-yield Escherichia coli expression and non-covalent binding system. Protein Expr Purif. 2022;192:106043. doi:10.1016/j.pep.2021.106043).
- Psyche-Ax-SiPC solubilized in dimethylsulfoxide at a concentration of 5 mM was stored at -80°C as a stock solution.
- Z HER2:342 -Cupid-His and Psyche-Ax-SiPC were mixed in a 1:2 molar ratio on ice for 10 minutes in the dark.
- a concentrate of Z HER2:342 -Cupid-His-Ax-SiPC was diluted with phosphate buffered saline.
- ⁇ Treatment of model mice> Kadcyla® and Z HER2:342 -Cupid-His-Ax-SiPC were dosed at 300 ⁇ g and 150 ⁇ g. Twenty hours after injection, mice in the Z HER2:342 -Cupid-His-Ax-SiPC group were irradiated with a 690 nm light-emitting diode light (Yamato Scientific, Tokyo, Japan) at 230 J cm ⁇ 2 . 48 hours after the first light irradiation, the tumors were similarly irradiated again.
- Group 1 was injected with Kadcyla® on Day 0 (mean ⁇ SD: 417 ⁇ 88) and Group 2 was injected with Z HER2:342 -Cupid-His-Ax-SiPC on Day 0 (mean ⁇ SD: 384 ⁇ 126). Both groups were irradiated on day 1 (24 hour interval after injection) and day 3 (72 hour interval after injection). Kadcyla® group and Z HER2:342 -Cupid-His-Ax-SiPC group showed no statistically significant difference in tumor volume in each mouse.
- FIG. 11 shows changes in tumor volume in KPL-4 xenograft model mice after Kadcyla® and Z HER2:342 -Cupid-His-Ax-SiPC injections. Both groups showed reductions in tumor size after initial treatment.
- Tumor volumes in KPL-4 xenograft model mice gradually decreased after Kadcyla® treatment, decreasing to 0 mm 3 in only one case 21 days after injection (FIGS. 11B and D), whereas the same xenografts Tumor size in the model was rapidly reduced after Z HER2:342 -Cupid-His-Ax-SiPC treatment. Moreover, tumors in approximately half of the mice disappeared 11 days after Z HER2:342 -Cupid-His-Ax-SiPC injection (FIGS. 11C and D). Mean tumor volume was lowest around 20 days after treatment and during the recurrence check period. However, after the observation period, the tumor volume of xenograft model mice persisted and gradually increased again in 5/10 mice.
- tumor size was larger 2 months after injection in the Z HER2:342 -Cupid-His-Ax-SiPC group (mean volume at day 63: 381 ⁇ 296 mm 3 ).
- Kadcyla® group a steady decrease in tumor size was observed in the Kadcyla® group.
- FIG. 12 shows the change in size of 5 tumor recurrence cases after the second Z HER2:342 -Cupid-His-Ax-SiPC treatment.
- Tumor volume in xenograft model mice after the second Z HER2:342 -Cupid-His-Ax-SiPC treatment compared to the first Z HER2:342 -Cupid-His-Ax-SiPC treatment decreased rapidly due to Furthermore, tumors disappeared in all mice 7 days after the second Z HER2:342 -Cupid-His-Ax-SiPC injection (FIGS. 12A and B), indicating that the second Z HER2:342 -Cupid-His- More than one month after tumor recurrence after Ax-SiPC treatment, no re-growth was observed.
- Kadcyla (p ⁇ 0.001, Chi-square test) Kadcyla ( The frequency of granulomatous reactions in the granulomatous reaction group suggested that Kadcyla ® treatment may induce higher levels of tissue damage with hemorrhagic and necrotic changes than AMDC treatment . Pathological complete remission of the xenograft KPL-4 tumor was apparently achieved after the second local AMDC treatment. In addition, no histologically apparent side effects were observed in vital organs, except for microscopic focal liver necrosis observed in 2 mice (mouse #2 and 6) ( Figure 14).
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Abstract
Description
<1> 配列番号1に記載のアミノ酸配列(但し、C末端のPro-Ser-Ala-Ala-Ser His-His-His-His-His-Hisからなるアミノ酸配列は一部又は全部が欠失していてもよい)の、N末端側及び/又はC末端側に、リンカー配列を介して、分子量20,000以下の抗原結合分子が結合している、融合タンパク質。
<2> N末端側からC末端側に、分子量20,000以下の抗原結合分子と、リンカー配列と、配列番号1に記載のアミノ酸配列(但し、C末端のPro-Ser-Ala-Ala-Ser His-His-His-His-His-Hisからなるアミノ酸配列は一部又は全部が欠失していてもよい)とをこの順に有する、請求項1に記載の融合タンパク質。
<3> 抗原結合分子が、がん細胞に発現している抗原に結合する分子である、<1>又は<2>に記載の融合タンパク質。
<4> 抗原結合分子が、Her2に結合する分子である、<1>から<3>の何れか一に記載の融合タンパク質。
<5> 抗原結合分子が、配列番号2に記載のアミン酸配列を有する、<1>から<4>の何れか一に記載の融合タンパク質。
<6> リンカー配列が、グリシン残基及びセリン残基からなり、アミノ酸残基の数が5から25個である、<1>から<5>の何れか一に記載の融合タンパク質。
<7> リンカー配列が、[(Gly)m-Ser]n(式中、mは1~10の整数を示し、nは1~5の整数を示す)で示されるアミノ酸配列である、<1>から<6>の何れか一に記載の融合タンパク質。
<8> 配列番号4に記載のアミノ酸配列(但し、C末端のPro-Ser-Ala-Ala-Ser His-His-His-His-His-Hisからなるアミノ酸配列は一部又は全部が欠失していてもよい)を有する、<1>から<7>の何れか一に記載の融合タンパク質。
<9> 配列番号4に記載のアミノ酸配列(但し、C末端のPro-Ser-Ala-Ala-Ser His-His-His-His-His-Hisからなるアミノ酸配列は一部又は全部が欠失していてもよい)を有する融合タンパク質をコードする核酸。
<10> <1>から<8>の何れか一に記載の融合タンパク質を含む、がん治療剤またはがん診断剤。
<11> (1)<1>から<8>の何れか一に記載の融合タンパク質、及び(2)下記式(1)で示される化合物又はその塩と、診断用物質又は治療用物質とのコンジュゲートを含む、がんの治療または診断キット。
(式中、
X1a、X1b、X2a及びX2bはそれぞれ独立にO又はNHを示し、
Y1及びY2はそれぞれ独立にC又はSを示し、
Z1及びZ2はそれぞれ独立にO、S又はNHを示し、
V1及びV2はそれぞれ独立にS又はS+-O-を示し、n1及びn2はそれぞれ独立に0又は1の整数を示し、
L1及びL2はそれぞれ独立に、2価の連結基を示し、
L3は、診断用物質又は治療用物質と結合できる官能基を末端に含む基であり、
L4は、3価の連結基を示す。)
<12> 診断用物質又は治療用物質が、フタロシアニン染料である、<11>に記載のキット。
<13> <1>から<8>の何れか一に記載の融合タンパク質をコードする核酸を宿主で発現させる工程を含む、<1>から<8>の何れか一に記載の融合タンパク質の製造方法。
<14> 前記融合タンパク質を、細菌の封入体において発現させて回収する、<13>に記載の方法。
<抗原結合分子とストレプトアビジン変異体との融合タンパク質>
本発明の融合タンパク質は、配列番号1に記載のアミノ酸配列(但し、C末端のPro-Ser-Ala-Ala-Ser His-His-His-His-His-Hisからなるアミノ酸配列(又はC末端の6個のヒスチジンからなるアミノ酸配列)は一部又は全部が欠失していてもよい)の、N末端側及び/又はC末端側に、リンカー配列を介して、分子量20,000以下の抗原結合分子が結合している、融合タンパク質である。配列番号1に記載のアミノ酸配列(但し、C末端のPro-Ser-Ala-Ala-Ser His-His-His-His-His-Hisからなるアミノ酸配列は一部又は全部が欠失していてもよい)の、N末端側及びC末端側に両方に、リンカー配列を介して、分子量20,000以下の抗原結合分子が結合している場合、当該抗原結合分子は同一でも異なるものでもよい。
好ましくは、本発明の融合タンパク質は、N末端側からC末端側に、分子量20,000以下の抗原結合分子と、リンカー配列と、配列番号1に記載のアミノ酸配列(但し、C末端のPro-Ser-Ala-Ala-Ser His-His-His-His-His-Hisからなるアミノ酸配列は一部又は全部が欠失していてもよい)とをこの順に有する融合タンパク質である。
リンカー配列の具体例としては、グリシン残基及びセリン残基からなる配列を挙げることができる。リンカー配列としては、例えば、[(Gly)m-Ser]n(式中、mは1~10の整数を示し、nは1~5の整数を示す)で示されるアミノ酸配列を使用することができる。リンカー配列の具体例としては、Gly-Gly-Gly-Gly-Gly-Ser-Gly-Gly-Gly-Gly-Gly-Ser-Gly-Gly-Gly-Gly-Gly-Serを挙げることができるが特に限定されない。
本発明の融合タンパク質は、がん治療剤またはがん診断剤として有用である。
本発明によれば、(1)本発明の融合タンパク質、及び(2)後記する式(1)で示される化合物又はその塩と、診断用物質又は治療用物質とのコンジュゲートを含む、がんの治療または診断キットが提供される。
ビオチン改変二量体は、下記式(1)で示される化合物又はその塩であり、好ましくは下記式(2)で示される化合物又はその塩である。ビオチン改変二量体は、国際公開WO2015/125820号に記載されている化合物を使用することができる。
X1a、X1b、X2a及びX2bはそれぞれ独立にO又はNHを示し、
Y1及びY2はそれぞれ独立にC又はSを示し、
Z1及びZ2はそれぞれ独立にO、S又はNHを示し、
V1及びV2はそれぞれ独立にS又はS+-O-を示し、n1及びn2はそれぞれ独立に0又は1の整数を示し、
L1及びL2はそれぞれ独立に、2価の連結基を示し、
L3は、診断用物質又は治療用物質(例えば、フタロシアニン染料)と結合できる官能基を末端に含む基であり、
L4は、3価の連結基を示す。)
L1及びL2はそれぞれ独立に、-CONH-、-NHCO-、-O-、及び炭素数1から10のアルキレン基から選択される基の組み合わせからなる2価の連結基であることが好ましい。
L1、及びL2はそれぞれ独立に、-CONH-、-NHCO-、及び炭素数1から10のアルキレン基から選択される基の組み合わせからなる2価の連結基であることが好ましい。
ビオチン改変二量体に、診断用物質又は治療用物質を結合させることにより、ビオチン改変二量体と診断用物質又は治療用物質とのコンジュゲートを調製することができる。診断用物質又は治療用物質としては、蛍光色素、化学発光剤、放射性同位元素、金属化合物等からなる増感剤、金属化合物等からなる中性子捕捉剤、フタロシアニン染料、低分子化合物、マイクロあるいはナノバブル、タンパク質などを挙げることができる。好ましくは、フタロシアニン染料を使用することができる。
Xは、スルホン酸基を末端に有する置換基であることが好ましい。
(式中、p及びqはそれぞれ独立に1~5の整数を示す。)
である。
である。R1及びR2は特に好ましくはメチル基である。
ここで、アリール基は、炭素数1から6のアルキル基または炭素数1から6のアルコキシ基で置換されていてもよい。
複数個のR3が存在する場合、それぞれ同一でも異なっていてもよい。
ハロゲン原子としては、フッ素、塩素、臭素、ヨウ素のいずれでもよいが、好ましくはフッ素、塩素、又は臭素である。
光免疫療法とは、体内で特定の細胞を破壊するために光増感剤及び照射光を使用する治療法である。光増感剤は、特異的な波長の光に晒されるとき、付近の細胞のアポトーシス、ネクローシス、及び/又は自食作用を誘発できる細胞傷害性の活性酸素種を生じる。例えば、特許6127045号公報には、細胞を死滅させる方法であって、 細胞表面タンパク質を含む細胞を、治療有効量の1または複数の抗体-IR700分子と接触させるステップであって、該抗体が該細胞表面タンパク質に特異的に結合するステップと;該細胞に、660~740nmの波長で、かつ少なくとも1Jcm-2の線量で照射するステップと;該細胞に照射した約0~8時間後に、該細胞を1または複数の治療剤と接触させ、これにより、該細胞を死滅させるステップとを含む方法が記載されている。特表2017-524659号公報には、疾患又は病態を患っている対象において細胞毒性を誘発する方法であって、(a)対象の細胞に特異的に結合するプローブにコンジュゲートしたIRDye(登録商標)700DXなどのフタロシアニン染料を包含する治療的に有効な薬剤を該対象に投与し;そして、(b)細胞死を誘発するのに有効な量で適切な励起光を前記細胞に照射することを含む、方法が記載されている。
治療有効量は、上記のコンジュゲートと融合タンパク質のそれぞれについて、60キログラム当たり少なくとも0.5ミリグラム(mg/60kg)、少なくとも5mg/60kg、少なくとも10mg/60kg、少なくとも20mg/60kg、少なくとも30mg/60kg、少なくとも50mg/60kgである。例えば、静脈内投与される場合、1mg/60kg、2mg/60kg、5mg/60kg、20mg/60kg、または50mg/60kgの用量など、例えば、0.5~50mg/60kgである。別の例では、治療有効量は、少なくとも100μg/kg、少なくとも500μg/kgまたは少なくとも500μg/kgなど、少なくとも10μg/kg、例えば、腫瘍内投与または腹腔内投与される場合、100μg/kg、250μg/kg、約500μg/kg、750μg/kg、または1000μg/kgの用量など、例えば、10μg/kg~1000μg/kgである。一例では、治療有効量は、局所用溶液で投与される10μg/ml、20μg/ml、30μg/ml、40μg/ml、50μg/ml、60μg/ml、70μg/ml、80μg/ml、90μg/ml、または100μg/mlなど、20μg/ml~100μg/mlの間など、少なくとも500μg/mlなど、少なくとも1μg/mlである。
1H NMR (500 MHz, CDCl3): δ 9.65 (dd, J = 2.8 Hz, 5.7 Hz, 8H), 8.34 (dd, J = 2.8 Hz, 5.7 Hz, 8H), 1.18 (t, J= 7.6 Hz, 4H), -1.23 (m, 4H), -2.30 (m, 4H), -2.86 (s, 12H).
LRMS (ESI): m/z805.30 [M+H] +
1H NMR (500 MHz, CDCl3): δ 9.65 (dd, J = 2.8 Hz, 5.7 Hz, 8H), 8.35 (d, J = 2.8 Hz, 5.7 Hz, 8H), 4.08 (t, J = 4.8 Hz, 2H), 3.73-3.60 (m, 8H), 3.39 (t, J = 5.7 Hz, 2H), 1.76 (m, 2H), 1.18 (t, J = 6.7 Hz, 2H), -1.23 (m, 4H), -2.30 (m, 4H), -2.86 (s, 12H).
LRMS (ESI): m/z 1006.85 [M+H] +
化合物 5: 1H NMR (500 MHz, CD3OD): δ 9.72 (dd, J = 2.8 Hz, 5.7 Hz, 8H), 8.46 (dd, J = 2.8 Hz, 5.7 Hz, 8H), 3.97 (t, J = 4.8 Hz, 2H), 3.63-3.58 (m, 8H), 3.32 (m, 2H), 2.80-2.70 (m, 12H), 1.99 (t, J = 6.7 Hz, 2H), 1.70 (m, 6H), 1.60 (t, J = 6.7 Hz, 2H), -1.07 (m, 2H), -1.14 (m, 2H), -2.12 (m, 2H), -2.28 (m, 2H), -2.82 (s, 6H), -2.89 (s, 6H).
LRMS (ESI): m/z 1372.55 [M+H] +
1H NMR (500 MHz, CD3OD): δ 9.73 (dd, J = 2.8 Hz, 5.7 Hz, 8H), 8.46 (dd, J = 2.8 Hz, 5.7 Hz, 8H), 7.75 (s, 1H), 4.48 (t, J = 4.8 Hz, 2H), 3.95 (t, J= 3.8 Hz, 2H), 3.83 (t, J = 4.8 Hz, 2H), 3.60-3.50 (m, 6H), 2.80-2.70 (m, 12H), 2.67 (t, J = 7.6 Hz, 2H), 2.24 (brt, 2H), 2.00 (t, J = 8.6 Hz, 2H), 1.90 (t, J= 7.6 Hz, 2H), 1.71 (quin, J = 7.6 Hz, 6H), 1.61 (t, J = 6.7 Hz, 2H), -1.03 (brt, 2H), -1.11 (brt, 2H), -2.13 (t, J= 8.6 Hz, 2H), -2.27 (t, J = 8.6 Hz, 2H), -2.80 (s, 6H), -2.88 (s, 6H).
LRMS (ESI): m/z 1485.15 [M+H] +
LRMS (ESI): m/z 1159.20 [M+2H]2+
Cupid分子(配列番号1)(国際公開WO2015/125820)とHER2抗原を認識する分子(Lofblom, J. FEBS Lett. 584(12):2670-80(2010))(配列番号2)を融合し、Psyche分子(上記のPsyche J)およびHer2/ErbB2の両方に結合性を持つタンパク質(以下、FLと示す。)を大腸菌にて合成を行った。FLの遺伝子配列(配列番号3)はユーロフィン社で人工遺伝子合成を行った(配列番号4)。発現ベクターとしてpET45bを使用し定法に従い発現ベクターの作製を行った。具体的にはプライマーセット(Rv: catggtatatctccttcttaaagttaaac(配列番号5), Fw: cgcagcttaattaacctaggctgctgccac(配列番号6))を用いPCR反応でベクターの直鎖化を行った。人工遺伝子合成にて調製された配列は、プライマーセット(Fw: aggagatataccatgGTGGACAACAAATTCAACAAAGAG(配列番号7), Rv: gttaattaagctgcgTTAATGATGGTGGTGATGATGCGATG(配列番号8))を用いPCR反応で増幅を行った。PCR反応物はともにアガロースゲル電気泳動にてバンドを切り出して精製をおこなった。In-Fusion HD Cloning Kit(TaKaRa Bio)を用い精製されたベクターとインサートのライゲーション反応を説明書の用法容量に従いクローニングを実施した。
精製されたFLについてSPR(BiacoreT200, Cytiva)を用いてHER2(ErbB2)との結合活性について解析を行った。Sensor Chip CM5 (Cytiva)にアミンカップリング法 (Amine Coupling Kit, Cytiva) でHer2抗原 (Recombinant Human ErbB2/Her2 Fc Chimera Protein, R&D SYSTEMS)の固定化を行った。次に、FLの希釈系列(1E-08 Mから6.25E-10 Mまで2倍希釈系列)を用いて結合活性の測定を実施した。実施結果を図2に示す。結果より安定した結合を示すことが確認された。
96ウェルプレートに細胞数が 1 x 104cells/well、培養液50μL/wellとなるようにHer2陽性細胞(SK-BR-3, KPL-4)を播種し、一晩培養を行った。FLと光増感剤Psyche(上記の製造例6で製造した化合物8)をモル比が1:2になるように混合し(以下、複合体と示す。)、10μg/mLから2倍希釈系列12系列を作製した。希釈系列調整後、複合体を細胞に添加し24時間後に培養プレート底面から100 J/cm2 となるように690 nm の光を出すLEDで光照射を行った。その後、24時間培養し Cell Counting Kit-8 (同仁化学社) を用いて生細胞数の比較を行なった。用法用量は取扱説明書に従い試薬添加1時間半37℃、CO2 インキュベーターでインキュベーションしたのち、吸光度450nmを測定し、平均値を計算しバックグラウンド補正後、コントロールを100%として各条件のコントロールに対する細胞増殖の割合を計算した。実施結果を図4に示す。FLと光増感剤Psyche化合物の複合体は濃度依存的な細胞傷害性を有することが確認された。
10% FBS 含有DMEMにて培養を行ったKPL-4細胞を5 x 106 から10 x 106 cell/body でヌードマウス(5~10週令)の皮下もしくは第二乳腺に移植を行った。移植後、腫瘍塊の体積が50から200 mm3 となったマウスに、FLと光増感剤Psycheの複合体を75から150 μg/bodyとなるように尾静脈から投与を行った。対照薬としてHerceptin(中外製薬)を150 μg/bodyとなるように尾静脈から投与を行った。投与5から6時間後にFLと光増感剤Psyche複合体を投与したマウスに対し、腫瘍部分に 230J/cm2 となるように690 nm の光を出すLED(USHIO社)を用いて腫瘍塊部分に光照射を行った。光照射後、体重の測定、腫瘍塊の体積の測定を行った。具体的な腫瘍塊の体積測定は、ノギスで腫瘍塊の長径と短径を測定し計算式:(短径)2 × 長径 × 1/2 で計算される値を腫瘍塊の体積とした。実施結果を図5に示す。FLと光増感剤Psyche化合物の複合体は腫瘍増殖抑制効果を有することが確認された。
10% FBS 含有DMEMにて培養を行ったKPL-4細胞を5 x 106 から10 x 106 cell/body でヌードマウス(5~10週令)の皮下に移植を行った。移植後、腫瘍塊の体積が500から800 mm3 となったマウスに、FLと光増感剤Psycheの複合体を150 μg/bodyとなるように尾静脈から投与を行った。図6Aに示すように、薬剤投与から20時間後と68時間後に690 nm の光を出すLED(USHIO社)を用いてマウスの腫瘍部分に 230J/cm2 となるように麻酔下で光照射を行った。光照射後、体重の測定、腫瘍塊の体積の測定を行った。具体的な腫瘍塊の体積測定は、ノギスで腫瘍塊の長径と短径を測定し計算式:(短径)2 × 長径 × 1/2 で計算される値を腫瘍塊の体積とした。図6B、図6Cに示すように、光照射直後から腫瘍の退縮が見られ14週間後には、腫瘍は消滅し皮膚の傷も無くなっており、治療効果が確認された。
上記の<HER2認識タンパク質の調製方法>において調製した発現ベクターに対し、配列番号4に記載のアミノ酸配列のC末端11アミノ酸 ”PSAASHHHHHH” を除去した配列番号10に記載のアミノ酸配列を有するFL2-G5Sx3-del5を作製するための発現ベクターを、PCRを用いて目的の遺伝子配列を欠失する部位特異的変異導入法で作製した。具体的には、プライマーセット(Fw;AAGTCAAATAACGCAGCTTAATTAACCTAG(配列番号11),Rw;TGCGTTATTTGACTTTGGTAAAGGTGTCATG(配列番号12))を用い、発現ベクターを鋳型としてPCR反応を行なった。その後、反応液のDpnI処理を37℃で1時間行い、その反応液で大腸菌の形質転換しクローニングを行なった。クローニング後、シーケンス解析を行い、配列番号13に記載されている遺伝子配列が組み込まれていることを確認しベクター名をpET45-FL2-G5Sx3-del5とした。
Fw;GAAACTGAATGATGCTCAAGCTCCGAAAGGAGGCGGAGGGTCTGCGGAAGCCGGTATTACCGGGACCTGGTC(配列番号16)
Rv: GACCAGGTCCCGGTAATACCGGCTTCCGCAGACCCTCCGCCTCCTTTCGGAGCTTGAGCATCATTCAGTTTC(配列番号17)
Fw:GCTCAAGCTCCGAAAGGAGGCGGAGGGTCTGGAGGTGGCGGTTCAGCGGAAGCCGGTATT(配列番号18)
Rv: AATACCGGCTTCCGCTGAACCGCCACCTCCAGACCCTCCGCCTCCTTTCGGAGCTTGAGC(配列番号19)
Fw:GCTCAAGCTCCGAAAGGAGGCGGAGGGTCTGGAGGTGGCGGTTCAGGTGGCGGTGGCAGTGCGGAAGCCGGTATT(配列番号20)
Rv: AATACCGGCTTCCGCACTGCCACCGCCACCTGAACCGCCACCTCCAGACCCTCCGCCTCCTTTCGGAGCTTGAGC(配列番号21)
まず初めに、FL2-G5Sx3-del5の発現・精製の検討を進めた。シーケンス配列が正しいことを確認されたプラスミドベクターをコンピテントセルBL21 (DE3)(ECOS Competent E.coli BL21 (DE3), ニッポンジーン社)に導入し形質転換を行った。100 mL の2xYT培地で一晩培養された培養液を1リットルの培養液に食菌し37℃にて培養を行い、600 nm のOD値が0.5-0.8になった時点で最終濃度0.5 mM になるようにIPTGを添加し、37℃にて4時間の培養を行ったのち菌体を遠心(7500 x g, 20 min at 4℃)にて回収した。
FL2-G5Sx3-del5について、<HER2認識タンパク質の調製方法>におけるIBの変性と巻き戻しに記載したものと同様のリフォールディングバッファーにて巻き戻しを試みた。希釈時に大量に凝集し、4量体の形成がされにくいことが分かった。この問題を解決するためにpHによる4量体形成の最適化を進めた(図7)。リフォールディングバッファー(50 mM リン酸ナトリウム, 0.4 M アルギニン塩酸塩, pH5.5)に攪拌しながら濃度調製済み変性タンパク質溶液を40-80倍希釈になる分量を滴下した場合、4量体形成が早期に確認された(図7A)。さらに48時間の4℃にてインキュベートにより、大部分の単量体の消失が確認された。また、pH5.5で4量体を形成したFL-del5は、その後、pH6.8-pH7.5のバッファーに置換されても4量体を維持することが確認された(図7B)。
FL2-G4Sx1-del5、FL2-G4Sx2-del5およびFL2-G4Sx3-del5についてもFL2-G5Sx3-del5同様の方法でIBを調製し、pH5.5のリフォールディングバッファーを使用し、巻戻すことで4量体を調製した(図8)。
96ウェルプレートに細胞数が 1 x 104cells/well、培養液50μL/wellとなるようにHer2陽性細胞(KPL-4)を播種し、一晩培養を行った。精製したFL2-G5Sx3-del5、FL2-G4Sx1-del5、FL2-G4Sx2-del5およびFL2-G4Sx3-del5と光増感剤Psyche(上記の製造例6で製造した化合物8)をモル比が1:2になるように混合し(以下、複合体と示す。)、10μg/mLから10倍希釈系列8系列(ゼロ濃度度を含む)を作製した。希釈系列調整後、複合体を細胞に添加し24時間後に培養プレート底面から100 J/cm2 となるように690 nm の光を出すLEDで光照射を行った。その後、24時間培養し、複合体含有培地を除去したのち、PBSで細胞を1回洗浄し、新しい培地を添加し Cell Counting Kit-8 (同仁化学社) を用いて生細胞数の比較を行なった。用法用量は取扱説明書に従い試薬添加1時間半37℃、CO2 インキュベーターでインキュベーションしたのち、吸光度450nmを測定し、平均値を計算しバックグラウンド補正後、コントロールを100%として各条件のコントロールに対する細胞増殖の割合を計算した。実施結果を(図9A-D)に示す。各種複合体は光および濃度依存的な細胞傷害性を有することが確認された。
AEAGITGTWSDQLGDTFIVTAGADGALTGTYENAVGGAESRYVLTGRYDSAPATDGSGTALGWTVAWKNNSKNAHSATTWSGQYVGGADAKINTQWLLTSGTTNANAWKSTLVGHDTFTKVKPSAASHHHHHH
VDNKFNKEMRNAYWEIALLPNLNNQQKRAFIRSIYDDPSQSANLLAEAKKLNDAQAPK
ATGGTGGACAACAAATTCAACAAAGAGATGCGCAATGCGTACTGGGAAATTGCCCTGTTACCGAACCTGAACAACCAGCAGAAACGTGCCTTCATTCGCAGCATCTATGACGATCCAAGCCAATCTGCGAATCTGCTTGCAGAAGCGAAGAAACTGAATGATGCTCAAGCTCCGAAAAGCGGAGGCGGCGGCGGGTCTGGTGGTGGCGGTGGCAGTGGCGGAGGTGGCGGTTCAGCGGAAGCCGGTATTACCGGGACCTGGTCCGATCAACTCGGCGACACGTTTATCGTGACAGCAGGCGCGGATGGCGCGCTGACAGGGACGTACGAGAATGCGGTAGGCGGTGCGGAAAGCCGCTATGTGTTGACCGGTCGTTACGATTCGGCTCCGGCTACGGATGGTTCCGGTACAGCCTTAGGGTGGACCGTTGCGTGGAAGAACAACTCGAAGAATGCCCACAGTGCTACCACTTGGTCAGGCCAGTATGTTGGCGGGGCGGATGCGAAAATCAACACTCAGTGGCTTCTGACCAGCGGAACCACGAATGCCAATGCGTGGAAATCCACGCTGGTCGGTCATGACACCTTTACCAAAGTCAAACCGAGTGCAGCATCGCATCATCACCACCATCATTAA
MVDNKFNKEMRNAYWEIALLPNLNNQQKRAFIRSIYDDPSQSANLLAEAKKLNDAQAPKSGGGGGSGGGGGSGGGGGSAEAGITGTWSDQLGDTFIVTAGADGALTGTYENAVGGAESRYVLTGRYDSAPATDGSGTALGWTVAWKNNSKNAHSATTWSGQYVGGADAKINTQWLLTSGTTNANAWKSTLVGHDTFTKVKPSAASHHHHHH
MVDNKFNKEMRNAYWEIALLPNLNNQQKRAFIRSIYDDPSQSANLLAEAKKLNDAQAPKSGGGGGSGGGGGSGGGGGSAEAGITGTWSDQLGDTFIVTAGADGALTGTYENAVGGAESRYVLTGRYDSAPATDGSGTALGWTVAWKNNSKNAHSATTWSGQYVGGADAKINTQWLLTSGTTNANAWKSTLVGHDTFTKVK
ATGGTGGACAACAAATTCAACAAAGAGATGCGCAATGCGTACTGGGAAATTGCCCTGTTACCGAACCTGAACAACCAGCAGAAACGTGCCTTCATTCGCAGCATCTATGACGATCCAAGCCAATCTGCGAATCTGCTTGCAGAAGCGAAGAAACTGAATGATGCTCAAGCTCCGAAAAGCGGAGGCGGCGGCGGGTCTGGTGGTGGCGGTGGCAGTGGCGGAGGTGGCGGTTCAGCGGAAGCCGGTATTACCGGGACCTGGTCCGATCAACTCGGCGACACGTTTATCGTGACAGCAGGCGCGGATGGCGCGCTGACAGGGACGTACGAGAATGCGGTAGGCGGTGCGGAAAGCCGCTATGTGTTGACCGGTCGTTACGATTCGGCTCCGGCTACGGATGGTTCCGGTACAGCCTTAGGGTGGACCGTTGCGTGGAAGAACAACTCGAAGAATGCCCACAGTGCTACCACTTGGTCAGGCCAGTATGTTGGCGGGGCGGATGCGAAAATCAACACTCAGTGGCTTCTGACCAGCGGAACCACGAATGCCAATGCGTGGAAATCCACGCTGGTCGGTCATGACACCTTTACCAAAGTCAAATAA
MVDNKFNKEMRNAYWEIALLPNLNNQQKRAFIRSIYDDPSQSANLLAEAKKLNDAQAPKGGGGSAEAGITGTWSDQLGDTFIVTAGADGALTGTYENAVGGAESRYVLTGRYDSAPATDGSGTALGWTVAWKNNSKNAHSATTWSGQYVGGADAKINTQWLLTSGTTNANAWKSTLVGHDTFTKVK
MVDNKFNKEMRNAYWEIALLPNLNNQQKRAFIRSIYDDPSQSANLLAEAKKLNDAQAPKGGGGSGGGGSAEAGITGTWSDQLGDTFIVTAGADGALTGTYENAVGGAESRYVLTGRYDSAPATDGSGTALGWTVAWKNNSKNAHSATTWSGQYVGGADAKINTQWLLTSGTTNANAWKSTLVGHDTFTKVK
MVDNKFNKEMRNAYWEIALLPNLNNQQKRAFIRSIYDDPSQSANLLAEAKKLNDAQAPKGGGGSGGGGSGGGGSAEAGITGTWSDQLGDTFIVTAGADGALTGTYENAVGGAESRYVLTGRYDSAPATDGSGTALGWTVAWKNNSKNAHSATTWSGQYVGGADAKINTQWLLTSGTTNANAWKSTLVGHDTFTKVK
ATGGTGGACAACAAATTCAACAAAGAGATGCGCAATGCGTACTGGGAAATTGCCCTGTTACCGAACCTGAACAACCAGCAGAAACGTGCCTTCATTCGCAGCATCTATGACGATCCAAGCCAATCTGCGAATCTGCTTGCAGAAGCGAAGAAACTGAATGATGCTCAAGCTCCGAAAGGAGGCGGAGGGTCTGCGGAAGCCGGTATTACCGGGACCTGGTCCGATCAACTCGGCGACACGTTTATCGTGACAGCAGGCGCGGATGGCGCGCTGACAGGGACGTACGAGAATGCGGTAGGCGGTGCGGAAAGCCGCTATGTGTTGACCGGTCGTTACGATTCGGCTCCGGCTACGGATGGTTCCGGTACAGCCTTAGGGTGGACCGTTGCGTGGAAGAACAACTCGAAGAATGCCCACAGTGCTACCACTTGGTCAGGCCAGTATGTTGGCGGGGCGGATGCGAAAATCAACACTCAGTGGCTTCTGACCAGCGGAACCACGAATGCCAATGCGTGGAAATCCACGCTGGTCGGTCATGACACCTTTACCAAAGTCAAATAA
ATGGTGGACAACAAATTCAACAAAGAGATGCGCAATGCGTACTGGGAAATTGCCCTGTTACCGAACCTGAACAACCAGCAGAAACGTGCCTTCATTCGCAGCATCTATGACGATCCAAGCCAATCTGCGAATCTGCTTGCAGAAGCGAAGAAACTGAATGATGCTCAAGCTCCGAAAGGAGGCGGAGGGTCTGGAGGTGGCGGTTCAGCGGAAGCCGGTATTACCGGGACCTGGTCCGATCAACTCGGCGACACGTTTATCGTGACAGCAGGCGCGGATGGCGCGCTGACAGGGACGTACGAGAATGCGGTAGGCGGTGCGGAAAGCCGCTATGTGTTGACCGGTCGTTACGATTCGGCTCCGGCTACGGATGGTTCCGGTACAGCCTTAGGGTGGACCGTTGCGTGGAAGAACAACTCGAAGAATGCCCACAGTGCTACCACTTGGTCAGGCCAGTATGTTGGCGGGGCGGATGCGAAAATCAACACTCAGTGGCTTCTGACCAGCGGAACCACGAATGCCAATGCGTGGAAATCCACGCTGGTCGGTCATGACACCTTTACCAAAGTCAAATAA
ATGGTGGACAACAAATTCAACAAAGAGATGCGCAATGCGTACTGGGAAATTGCCCTGTTACCGAACCTGAACAACCAGCAGAAACGTGCCTTCATTCGCAGCATCTATGACGATCCAAGCCAATCTGCGAATCTGCTTGCAGAAGCGAAGAAACTGAATGATGCTCAAGCTCCGAAAGGAGGCGGAGGGTCTGGAGGTGGCGGTTCAGGTGGCGGTGGCAGTGCGGAAGCCGGTATTACCGGGACCTGGTCCGATCAACTCGGCGACACGTTTATCGTGACAGCAGGCGCGGATGGCGCGCTGACAGGGACGTACGAGAATGCGGTAGGCGGTGCGGAAAGCCGCTATGTGTTGACCGGTCGTTACGATTCGGCTCCGGCTACGGATGGTTCCGGTACAGCCTTAGGGTGGACCGTTGCGTGGAAGAACAACTCGAAGAATGCCCACAGTGCTACCACTTGGTCAGGCCAGTATGTTGGCGGGGCGGATGCGAAAATCAACACTCAGTGGCTTCTGACCAGCGGAACCACGAATGCCAATGCGTGGAAATCCACGCTGGTCGGTCATGACACCTTTACCAAAGTCAAATAA
(1)材料及び方法
<試薬など>
Escherichia coli株BL21(DE3)(カタログ番号: 312-06534, Nippon Gene, Tokyo, Japan)を発現宿主として使用した。pET-45b(+)ベクターをクローニングおよび遺伝子発現分析に使用した(カタログ番号: 71327; Novagen, Madison, WI, USA)。変性緩衝液は、0.1M Tris-HCl、pH 8.5、10mM EDTA、および6M塩酸グアニジンである。リフォールディング緩衝液は、0.1Mリン酸ナトリウム、0.4Mアルギニン-HCl、pH 6.0である。ゲル濾過緩衝液は、0.1Mリン酸ナトリウム、0.2Mアルギニン-HCl、pH 6.5である。
ヒト乳癌KPL-4細胞は、Kurebayashi教授(Kawasaki Medical School, Kurashiki, Japan)から供与された。Kadcyla(トラスツズマブエムタンシン)は、Roche(バーゼル、スイス)から購入した。
組換えZHER2:342‐Cupid‐Hisタンパク質は、上記の<HER2認識タンパク質の調製方法>に記載したものと同一であり、変性剤を用いた変性および直接希釈リフォールディング法により大腸菌封入体から製造したものである。組換えZHER2:342-Cupid-Hisタンパクの発現と精製については、これまでに詳述した(Sugiyama A, Kawamura T, Tanaka T, et al. Cupid and Psyche system for the diagnosis and treatment of advanced cancer. Proc Jpn Acad Ser B Phys Biol Sci. 2019;95:602-611. doi:10.2183/pjab.95.041)。簡単に述べると、大腸菌株BL21(DE3)を発現ベクターpET45b(+)‐ZHER2:342‐Cupid‐Hisで形質転換し、封入体(IB)として組換えZHER2:342‐Cupid‐Hisタンパク質を発現させた。精製IBを変性緩衝液に可溶化した。可溶化したIB溶液を遠心分離(12,000×g、4℃で15分)を用いて清澄化し、リフォールディング緩衝液で直接40倍希釈を用いてリフォールディングした。4℃で72時間インキュベートした後、ゲル濾過カラム(HiLoad 16/600 Superdex 75pg, #28989333, Cytiva, Marlborough, MA, USA)を用いて、ゲル濾過緩衝液でリフォールディングした四量体組換えZHER2:342-Cupid-Hisタンパク質を精製した。四量体組換えZHER2:342-Cupid-His蛋白質の純度を、非還元(沸騰なしおよび還元剤なし)SDS-PAGE(TGX Stain-Free FastCast 12%, #1610185, Bio-Rad, Hercules, CA, USA)によって分析した。HER2およびPsyche‐Ax‐SiPCに対する四量体組換えZHER2:342‐Cupid‐His蛋白質の結合活性は、Biacore T200(Cytiva, Marlborough, MA, USA)による表面プラズモン共鳴を用いて分析した。
<動物モデルの調製>
KPL-4細胞株を、DMEM(低グルコース)(FUJIFILM Wako Pure Chemical Corporation, Osaka, Japan)中に、10% FBS、100 U/mLペニシリン、および100μg/mLストレプトマイシン(#15140122、Thermo Fisher Scientific、米国、MA、Waltham)を補充したもので維持した(Kurebayashi J, Otsuki T, Tang CK, et al. Isolation and characterization of a new human breast cancer cell line, KPL-4, expressing the Erb B family receptors and interleukin-6. Br J Cancer. 1999;79:707-717. doi:10.1038/sj.bjc.6690114)。KPL‐4細胞(750万)をBALB/cSlc‐nu/nuヌードマウス(三共ラボサービス(株)、東京、日本)の大腿に皮下移植した。皮下腫瘍増殖はノギスを用いて腫瘍体積(0.5×長さ×幅2)を測定することによってモニターし、治療関連毒性の指標として動物体重をモニターした。20匹のマウスの腫瘍大きさは移植後44日で増加し、約400mm3に達した。これら20匹のマウスを、それぞれKadcyla(登録商標)群とZHER2:342-Cupid-His-Ax-SiPC群の2群の10匹のマウスにランダムに分類した。
Kadcyla(登録商標)とZHER2:342-Cupid-His-Ax-SiPC(図10A)を0日目にxenograftモデルマウスに注入した。本試験では、腫瘍の再燃を評価するため、最初の治療から約19日後に観察期間を設定した。腫瘍再燃の場合は、初回治療前の同時期である癌細胞増殖の再発確認期(初回治療後63日目)の44日後に2回目の治療を実施した。最後に、異種移植モデルマウスは治療後97日目に、2回目の治療後19日以上経過してから屠殺した。図10Bは、実験計画の概略図を示す。
Kadcyla(登録商標)はメーカーの指示に従って作成した。ZHER2:342-Cupid-HisとPsyche-Ax-SiPCの調製は既報である(Yamatsugu K, Katoh H, Yamashita T, et al. Antibody mimetic drug conjugate manufactured by high-yield Escherichia coli expression and non-covalent binding system. Protein Expr Purif. 2022;192:106043. doi:10.1016/j.pep.2021.106043)。簡潔に言うと、ジメチルスルホキシド中に5mMの濃度で可溶化したPsyche-Ax-SiPCを、ストック溶液として-80℃で保存した。錯体を調製するために、ZHER2:342-Cupid-HisおよびPsyche-Ax-SiPCを、氷上の暗所で10分間、1:2のモル比で混合した。ZHER2:342-Cupid-His-Ax-SiPCの濃縮物を、リン酸緩衝食塩水を用いて希釈した。
Kadcyla(登録商標)およびZHER2:342-Cupid-His-Ax-SiPCを、300μgおよび150μgで投与した。注射の20時間後、ZHER2:342-Cupid-His-Ax-SiPC群のマウスに、690nmの発光ダイオードライト(ヤマトサイエンティフィック社、東京、日本)を230 J cm-2で照射した。最初の光照射の48時間後に、腫瘍に再度同様に照射した。
異種移植腫瘍部位からの皮膚試料、および肺、心臓、腎臓、肝臓および消化管を含む他の重要な器官からの試料をマウスから得、これらの試料を4%パラホルムアルデヒドリン酸緩衝液(#163-20145、FUJIFILM Wako Pure Chemical Corporation, Osaka, Japan)で4℃24時間固定し、次いで標準的な組織病理学的手順に従ってパラフィンに包埋した。H&E染色は組織病理学的試験片を、キシレン(#241-00091、FUJIFILM和光純化学株式会社、大阪、日本)中に室温で10分間浸漬することによって脱パラフィン化し、次いでエタノール(#057-00451、FUJIFILM和光純化学株式会社、大阪、日本)中に浸漬することによって再水和した。ヘマトキシリン(#6187-4P, Sakura Finetek Japan, Tokyo, Japan)およびエオシン(#8660, Sakura Finetek Japan, Tokyo, Japan)溶液を、製造者のプロトコールに従ってH&E染色に使用した。染色したスライドを、エタノールに浸漬し、続いてキシレンに浸漬することによって再び脱水した。マリノール(#4197193; Muto Pure Chemicals, Tokyo, Japan)を含むガラスカバースリップを使用して、染色したスライドを覆った。H&E染色スライドを、OLYMPUS cellSens Standard system(OLYMPUS, Tokyo, Japan)を用いて組織学的に試験した。
p値0.05未満(p <0.05)を統計学的に有意とした。すべてのグラフ、計算、および統計解析は、Microsoft Excel(Microsoft Corp., Redmond, WA, USA)用の統計パッケージを用いて行った。
(2-1)局所AMDC治療(ZHER2:342-Cupid-His-Ax-SiPCによる治療)は異種移植マウスモデルの腫瘍容積を急速に減少させたが、一部の症例では再発に至った。
HER2陽性乳癌マウス異種移植モデルを確立するために、BALB/cSlc‐nu/nuヌードマウスにKPL‐4細胞を皮下移植した。20匹のマウスの腫瘍体積はKPL‐4細胞注射後に増加し、細胞移植44日後に400±110 mm3(125から551 mm3)の平均体積に達した。KPL-4異種移植片モデルマウスを無作為に2つの処置群(群あたりn=10)に分けた。群1の0日目にKadcyla(登録商標)を注射し(平均± SD: 417±88)、群2の0日目にZHER2:342 -Cupid-His-Ax-SiPCを注射した(平均± SD: 384±126)。両群とも1日目(注射後24時間隔)および3日目(注射後72時間隔)に照射した。Kadcyla(登録商標)群およびZHER2:342 -Cupid-His-Ax-SiPC群では、それぞれのマウスにおける腫瘍体積に統計的な有意差は見られなかった。
反復した局所AMDC治療の有効性を調べるために、ZHER2:342-Cupid-His-Ax-SiPCプレコンジュゲートを、最初の治療の63日後(腫瘍観察期間の44日後)に異種移植片モデルマウスに注射し、再発腫瘍の大きさを測定した。図12は、2回目のZHER2:342-Cupid-His-Ax-SiPC治療後の5つの腫瘍再発症例の大きさの変化を示す。異種移植片モデルマウスにおける腫瘍体積は、1回目のZHER2:342‐Cupid‐His‐Ax‐SiPC処置の場合と比較して、2回目のZHER2:342‐Cupid‐His‐Ax‐SiPC処置後により急速に減少した。さらに、腫瘍は、2回目のZHER2:342-Cupid-His-Ax-SiPC注射の7日後に全てのマウスにおいて消失し(図12A及びB)、2回目のZHER2:342-Cupid-His-Ax-SiPC治療の後に腫瘍が再発してから1ヶ月を超えても、再増殖は認められなかった。1回目のZHER2:342‐Cupid‐His‐Ax‐SiPC治療後0日目と97日目の間で腫瘍大きさに有意差があった。さらに、ZHER2:342 -Cupid-His-Ax-SiPC反復治療群の塊の大きさは、最初の治療の97日後のKadcyla(登録商標)治療群のものよりも小さかった(図12C)。これらの結果は、反復した局所AMDC治療が、再発腫瘍を迅速かつ完全に消散させたことを示唆する。
局所AMDC治療に対する病理学的反応を評価するために、Kadcyla(登録商標)およびZHER2:342‐Cupid‐His‐Ax‐SiPC治療後97日目にKPL‐4異種移植片モデルマウスの組織学的検査を行った。組織学的には、97日目に異種移植KPL-4腫瘍部位周辺の皮下領域において、Kadcyla(登録商標)処置(n = 10)または2回目のAMDC処置(n = 10)マウスのいずれにおいても、残存腫瘍細胞は観察されなかった(図13及び図14)。いずれのマウスにおいてもリンパ節や遠隔臓器に転移性腫瘍は認められなかった(図13及び図14)。よって、病理学的完全寛解は両群で達成されたと結論された。さらなる組織学的観察によれば、ヘモシデリンを含むマクロファージの巣との肉芽腫性反応および/または局所石灰化がKadcyla(登録商標)処置マウスの皮下領域において頻繁に観察された (6/10[マウス#1、2、3、7、8および10]、60%)(図13)。Kadcyla(登録商標)処置マウスの1匹(マウス#2)では、肉芽腫組織に囲まれた皮下のう胞も認められた。対照的に、腫瘍肉芽腫性反応は2回目のAMDC処置群(1/10[マウス#6]、10%)では稀に観察された(図14)(p <0.001、カイ二乗検定)Kadcyla(登録商標)治療群の肉芽腫性反応の頻度は、Kadcyla(登録商標)治療がAMDC治療よりも出血性および壊死性の変化を伴う高レベルの組織障害を誘発する可能性があることを示唆した。2回目の局所AMDC治療後、異種移植KPL‐4腫瘍の病理学的完全寛解が明らかに達成された。さらに、2匹のマウス(マウス#2および6)で観察された顕微鏡的限局性肝壊死を除き、重要臓器に組織学的に明らかな副作用は観察されなかった(図14)。
Claims (14)
- 配列番号1に記載のアミノ酸配列(但し、C末端のPro-Ser-Ala-Ala-Ser His-His-His-His-His-Hisからなるアミノ酸配列は一部又は全部が欠失していてもよい)の、N末端側及び/又はC末端側に、リンカー配列を介して、分子量20,000以下の抗原結合分子が結合している、融合タンパク質。
- N末端側からC末端側に、分子量20,000以下の抗原結合分子と、リンカー配列と、配列番号1に記載のアミノ酸配列(但し、C末端のPro-Ser-Ala-Ala-Ser His-His-His-His-His-Hisからなるアミノ酸配列は一部又は全部が欠失していてもよい)とをこの順に有する、請求項1に記載の融合タンパク質。
- 抗原結合分子が、がん細胞に発現している抗原に結合する分子である、請求項1又は2に記載の融合タンパク質。
- 抗原結合分子が、Her2に結合する分子である、請求項1から3の何れか一項に記載の融合タンパク質。
- 抗原結合分子が、配列番号2に記載のアミン酸配列を有する、請求項1から4の何れか一項に記載の融合タンパク質。
- リンカー配列が、グリシン残基及びセリン残基からなり、アミノ酸残基の数が5から25個である、請求項1から5の何れか一項に記載の融合タンパク質。
- リンカー配列が、[(Gly)m-Ser]n(式中、mは1~10の整数を示し、nは1~5の整数を示す)で示されるアミノ酸配列である、請求項1から6の何れか一項に記載の融合タンパク質。
- 配列番号4に記載のアミノ酸配列(但し、C末端のPro-Ser-Ala-Ala-Ser His-His-His-His-His-Hisからなるアミノ酸配列は一部又は全部が欠失していてもよい)を有する、請求項1から7の何れか一項に記載の融合タンパク質。
- 配列番号4に記載のアミノ酸配列(但し、C末端のPro-Ser-Ala-Ala-Ser His-His-His-His-His-Hisからなるアミノ酸配列は一部又は全部が欠失していてもよい)を有する融合タンパク質をコードする核酸。
- 請求項1から8の何れか1項に記載の融合タンパク質を含む、がん治療剤またはがん診断剤。
- (1)請求項1から8の何れか1項に記載の融合タンパク質、及び(2)下記式(1)で示される化合物又はその塩と、診断用物質又は治療用物質とのコンジュゲートを含む、がんの治療または診断キット。
(式中、
X1a、X1b、X2a及びX2bはそれぞれ独立にO又はNHを示し、
Y1及びY2はそれぞれ独立にC又はSを示し、
Z1及びZ2はそれぞれ独立にO、S又はNHを示し、
V1及びV2はそれぞれ独立にS又はS+-O-を示し、n1及びn2はそれぞれ独立に0又は1の整数を示し、
L1及びL2はそれぞれ独立に、2価の連結基を示し、
L3は、診断用物質又は治療用物質と結合できる官能基を末端に含む基であり、
L4は、3価の連結基を示す。) - 診断用物質又は治療用物質が、フタロシアニン染料である、請求項11に記載のキット。
- 請求項1から8の何れか一項に記載の融合タンパク質をコードする核酸を宿主で発現させる工程を含む、請求項1から8の何れか一項に記載の融合タンパク質の製造方法。
- 前記融合タンパク質を、細菌の封入体において発現させて回収する、請求項13に記載の方法。
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