WO2014157692A1 - Wt1抗原ペプチドコンジュゲートワクチン - Google Patents
Wt1抗原ペプチドコンジュゲートワクチン Download PDFInfo
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- WO2014157692A1 WO2014157692A1 PCT/JP2014/059336 JP2014059336W WO2014157692A1 WO 2014157692 A1 WO2014157692 A1 WO 2014157692A1 JP 2014059336 W JP2014059336 W JP 2014059336W WO 2014157692 A1 WO2014157692 A1 WO 2014157692A1
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Definitions
- the present invention belongs to the field of cancer immunotherapy and is a cytotoxic T cell comprising a cancer antigen peptide precursor derived from WT1 antigen protein complexed via a sulfur-sulfur covalent bond, which can be trimmed by the peptide degrading enzyme ERAP1.
- the present invention relates to a conjugate vaccine that efficiently induces.
- CTL cytotoxic T lymphocytes, cytotoxic T-lymphocyte, cytotoxic T-cell, hereinafter referred to as CTL
- CTLs are produced by the differentiation and proliferation of precursor T cells that recognize complexes formed by cancer antigen protein-derived antigenic peptides (cancer antigen peptides) and MHC class I molecules, and attack cancer cells. .
- WT1 gene Wilms tumor tumor suppressor gene WT1 (WT1 gene) is considered to be a new cancer antigen protein in leukemia and solid cancer (see Non-Patent Document 1).
- WT1 126-134 peptide RMFPNAPYL (Arg-Met-Phe-Pro-Asn-Ala-Pro-Tyr-Leu) (SEQ ID NO: 2), WT1 235-243 peptide: CMTWNQMNL (Cys-Met-Thr-Trp-Asn-Gln-Met-Asn-Leu) (SEQ ID NO: 3), WT1 10-18 peptide: ALLPAVPSL (Ala-Leu-Leu-Pro-Ala-Val-Pro-Ser-Leu) (SEQ ID NO: 5), WT1 187-195 peptide: SLGEQQYSV (Ser-Leu-Gly -Glu-Gln-Gln-Tyr-Ser-Val) ( SEQ ID NO: 6), WT1 302-
- helper T cells Activation of helper T cells in cancer immunotherapy is also important for enhancing the function of other T cells including CTL.
- an antigen protein is degraded by intracellular lysosomes, and a part of a fragment peptide composed of peptides consisting of amino acids of about 13 to 17 residues binds to an MHC class II molecule as an antigen peptide, and the helper T cell It activates helper T cell by being presented to the TCR / CD3 complex.
- WT1 protein for example, cancer antigen peptides that are bound and presented to the following MHC class II have been reported (see Patent Documents 3 to 5).
- the WT1 vaccine antigen the antigen protein itself or the antigen peptide derived from the antigen protein as described above is mainly used (see Non-Patent Document 2).
- Protein-based cancer vaccines usually contain a variety of cancer antigen peptides, so it is possible to induce multiple CTLs and helper T cells at the same time.
- Peptides that are easy to manage are widely used as WT1 cancer antigens.
- conventional peptide vaccines are mainly composed of a single MHC class I-presenting peptide antigen, and further improvements are required to efficiently induce CTLs. (See Non-Patent Document 3).
- One solution is a multivalent antigen peptide-presenting WT1 peptide cancer vaccine.
- a peptide cancer vaccine As such a peptide cancer vaccine, a cocktail vaccine in which a plurality of peptide antigens presented in MHC class I and class II are mixed (see Non-Patent Document 4), and a peptide antigen presented in MHC class I and class II is amide-linked. A long-chain peptide vaccine linked in (1) has been reported (see Non-Patent Document 5).
- cocktail vaccines since each peptide antigen composed of various amino acids exhibits various physical properties, it is often difficult to develop an optimal formulation that efficiently induces CTLs corresponding to them.
- long-chain peptide vaccines there are cases where there are problems in the production thereof as in the case of proteins. Furthermore, long-chain peptide vaccines bind peptide antigens presented in class I and class II via an arbitrary peptide spacer. Therefore, it is difficult to control and predict the cleavage site by intracellular enzymes.
- a peptide dimer in which two peptide monomers are bonded to each other by a disulfide bond has been reported (see Patent Document 6). Unlike cocktail vaccines, these two have a single physical property and can be easily produced because two single peptides are combined.
- the WT1 cancer antigen peptide needs to contain cysteine in its amino acid sequence, and its versatility is low. Furthermore, a variant obtained by condensing the N-terminal cysteine of a cancer antigen peptide with cysteine, glutathione or thioglycolic acid with a disulfide bond has also been reported (see Patent Document 7).
- Endoplasmic reticulum aminopeptidase 1 (hereinafter referred to as ERAP1) is one of the trimming enzymes in the endoplasmic reticulum (Endoplasmic reticulum; hereinafter referred to as ER) and has a specific antigen peptide sequence and peptide length. It has been reported that the cancer antigen peptide precursor is cleaved from the N-terminus and adjusted to an optimal length for binding to MHC class I (see Non-Patent Documents 6-8). However, so far, there has been no report of a WT1 peptide cancer antigen precursor containing a cysteine whose length is controlled from the N-terminus by the trimming function by ERAP1.
- An object of the present invention is to provide a WT1 conjugate vaccine that efficiently induces CTL.
- cysteine is added to the WT1 cancer antigen peptide while considering the use of a conjugate vaccine.
- cysteine is added to the WT1 cancer antigen peptide while considering the use of a conjugate vaccine.
- the present inventors have found a multivalent antigen peptide-presenting conjugate vaccine capable of inducing CTLs in the body, and completed the present invention.
- the present inventors have confirmed for the first time that the peptide or conjugate is easily subjected to trimming by ERAP1 in vitro and / or in vivo, and as a result, produces a cancer antigen peptide, and the present invention has been completed. It was.
- the development of a novel multivalent WT1 antigen peptide-presenting peptide cancer vaccine that is easy to manufacture, excellent in versatility, and efficiently induces CTLs has been desired.
- WT1 conjugate vaccine having excellent physicochemical properties, easy production, easy production management, and versatility.
- the present invention relates to the following.
- X a and Y a independently represent a single bond or a divalent group of a peptide consisting of amino acids of 1 to 4 residues, and the number of amino acid residues of X a and the number of amino acid residues of Y a The sum of is an integer from 0 to 4, Cancer antigen peptide A represents MHC class I-restricted WT1 peptide consisting of an amino acid of 7 to 30 residues, the amino group of the N-terminal amino acid of the cancer antigen peptide A bound to Y a in the formula (1), cancer The carbonyl group of the C-terminal amino acid of antigen peptide A is bonded to the hydroxyl group in formula (1), R 1 is a hydrogen atom, Formula (2):
- Cancer antigen peptide B represents an MHC class I-restricted WT1 peptide having a sequence different from that of cancer antigen peptide A and consisting of 7 to 30 amino acids.
- the amino group of the N-terminal amino acid of cancer antigen peptide B is represented by the formula (2 ) binds to Y b in, the carbonyl group of the C-terminal amino acids of the cancer antigen peptide B bound to the hydroxyl group in the formula (2), The thioether group in formula (2) is bonded to the thioether group in formula (1).
- a cancer antigen peptide C Cancer antigen peptide C is different in sequence from cancer antigen peptide A and has a MHC class I-restricted WT1 peptide consisting of 7 to 30 amino acids containing one cysteine residue or 7 to 30 containing one cysteine residue.
- X a is a divalent group of a peptide consisting of two amino acids and Y a is a single bond, or X a and Y a are independently a divalent group of a peptide consisting of one amino acid Or X a is a single bond and Y a is a divalent group of a peptide consisting of two amino acids, or X a is a divalent group of a peptide consisting of one amino acid and Y a is or a single bond, or X a is a divalent radical of a peptide and Y a is a single bond comprises the amino acid of one residue, or X a and Y a is a single bond, according to claim 1 A compound, or a pharmaceutically acceptable salt thereof;
- Item 3 The compound according to Item 1 or 2, or a pharmaceutically acceptable salt thereof, wherein X a is a single bond and Y a is a single bond, an alanine residue, a leucine residue or a methionine residue;
- Item 4 The compound according to Item 1 or 2, or a pharmaceutically acceptable salt thereof, wherein X a is a single bond or a divalent group of a peptide consisting of one amino acid and Y a is a single bond;
- Item 5 The compound according to any one of Items 1 to 4, wherein X a and Y a are a single bond, or a pharmaceutically acceptable salt thereof;
- Item 6 The compound according to any one of Items 1 to 5, or a pharmaceutically acceptable salt thereof, wherein the cancer antigen peptide A is an MHC class I-restricted WT1 peptide consisting of 7 to 15 amino acids.
- Cancer antigen peptide A has the following amino acid sequence: RMFPNAPYL (SEQ ID NO: 2), CMTWNQMNL (SEQ ID NO: 3), ALLPAVPSL (SEQ ID NO: 5), SLGEQQYSV (SEQ ID NO: 6) and RVPGVAPTL (SEQ ID NO: 7)
- RMFPNAPYL SEQ ID NO: 2
- CMTWNQMNL SEQ ID NO: 3
- ALLPAVPSL SEQ ID NO: 5
- SLGEQQYSV SEQ ID NO: 6
- RVPGVAPTL SEQ ID NO: 7
- Cancer antigen peptide A has the following amino acid sequence: RMFPNAPYL (SEQ ID NO: 2), CMTWNQMNL (SEQ ID NO: 3), CYTWNQMNL (SEQ ID NO: 4), ALLPAVPSL (SEQ ID NO: 5), SLGEQQYSV (SEQ ID NO: 6) and RVPGVAPTL (SEQ ID NO: 7)
- RMFPNAPYL SEQ ID NO: 2
- CMTWNQMNL SEQ ID NO: 3
- CYTWNQMNL SEQ ID NO: 4
- ALLPAVPSL SEQ ID NO: 5
- SLGEQQYSV SEQ ID NO: 6
- RVPGVAPTL SEQ ID NO: 7
- Item 8 The compound according to any one of Items 1 to 7, or a pharmaceutically acceptable salt thereof, which is a peptide consisting of any amino acid sequence selected from
- Item 9 The compound according to any one of Items 1 to 8, wherein R 1 is a hydrogen atom, or a pharmaceutically acceptable salt thereof;
- the compound represented by the formula (1) has the following amino acid sequence: CRMFPNAPYL (SEQ ID NO: 13), CCMTWNQMNL (SEQ ID NO: 14), CCYTWNQMNL (SEQ ID NO: 15), CALLPAVPSL (SEQ ID NO: 16), CSLGEQQYSV (SEQ ID NO: 17) and CRVPGVAPTL (SEQ ID NO: 18) Item 10.
- Item 11 The compound according to any one of Items 1 to 8, or a pharmaceutically acceptable salt thereof, wherein R 1 is a group represented by Formula (2);
- X b is a divalent group of a peptide consisting of two amino acids and Y b is a single bond, or X b and Y b are independently a divalent group of a peptide consisting of one amino acid Or X b is a single bond and Y b is a divalent group of a peptide consisting of two amino acids, or X b is a divalent group of a peptide consisting of one amino acid and Y b is Item 1-8, wherein X is a single bond, X b is a single bond and Y b is a divalent group of a peptide consisting of one amino acid, or X b and Y b are a single bond 11.
- Item 13 The compound according to any one of Items 1 to 8 and 11 to 12, wherein X b is a single bond and Y b is a single bond, an alanine residue, a leucine residue or a methionine residue, or a pharmaceutically acceptable salt thereof Acceptable salts;
- Item 14 The compound according to any one of Items 1 to 8 and 11 to 12, wherein X b is a single bond or a divalent group of a peptide consisting of an amino acid having one residue, and Y b is a single bond, or a pharmaceutical thereof Top acceptable salts;
- Item 15 The compound according to any one of Items 1 to 8 and 11 to 14, or a pharmaceutically acceptable salt thereof, wherein X b and Y b are a single bond;
- Item 16 The compound according to any one of Items 1 to 8 and 11 to 15, or a pharmaceutically acceptable salt thereof, wherein the cancer antigen peptide B is an MHC class I-restricted WT1 peptide consisting of 7 to 15 amino acids. ;
- Cancer antigen peptide B has the following amino acid sequence: RMFPNAPYL (SEQ ID NO: 2), CMTWNQMNL (SEQ ID NO: 3), ALLPAVPSL (SEQ ID NO: 5), SLGEQQYSV (SEQ ID NO: 6) and RVPGVAPTL (SEQ ID NO: 7)
- RMFPNAPYL SEQ ID NO: 2
- CMTWNQMNL SEQ ID NO: 3
- ALLPAVPSL SEQ ID NO: 5
- SLGEQQYSV SEQ ID NO: 6
- RVPGVAPTL SEQ ID NO: 7
- Cancer antigen peptide B has the following amino acid sequence: RMFPNAPYL (SEQ ID NO: 2), CMTWNQMNL (SEQ ID NO: 3), CYTWNQMNL (SEQ ID NO: 4), ALLPAVPSL (SEQ ID NO: 5), SLGEQQYSV (SEQ ID NO: 6) and RVPGVAPTL (SEQ ID NO: 7) Item 18.
- RMFPNAPYL SEQ ID NO: 2
- CMTWNQMNL SEQ ID NO: 3
- CYTWNQMNL SEQ ID NO: 4
- ALLPAVPSL SEQ ID NO: 5
- SLGEQQYSV SEQ ID NO: 6
- RVPGVAPTL SEQ ID NO: 7
- Item 20 The compound according to any one of Items 1 to 8, wherein R 1 is cancer antigen peptide C, or a pharmaceutically acceptable salt thereof;
- Item 21 The compound according to any one of Items 1 to 8 and 20, or a pharmaceutically acceptable salt thereof, wherein the cancer antigen peptide C is an MHC class I-restricted WT1 peptide consisting of 7 to 15 amino acids.
- Cancer antigen peptide C has the following amino acid sequence: CMTWNQMNL (SEQ ID NO: 3) Any one of Items 1 to 8 and 20 to 21, wherein the peptide comprises a modified amino acid sequence containing a modified amino acid residue in the amino acid sequence of SEQ ID NO: 3 and has a CTL-inducing activity Or a pharmaceutically acceptable salt thereof;
- Cancer antigen peptide C has the following amino acid sequence: CMTWNQMNL (SEQ ID NO: 3) and CYTWNQMNL (SEQ ID NO: 4) Item 23.
- Item 25 The compound according to any one of Items 1 to 8 and 20, or a pharmaceutically acceptable salt thereof, wherein the cancer antigen peptide C is an MHC class II-restricted WT1 peptide consisting of 14 to 30 amino acids.
- Cancer antigen peptide C has the following amino acid sequence: SGQARMFPNAPYLPSC (SEQ ID NO: 19), SGQARMFPNAPYLPSCLES (SEQ ID NO: 11), PGCNKRYFKLLSHLQMHSRK (SEQ ID NO: 20), PGCNKRYFKLSHHLQMHSRKH (SEQ ID NO: 21), PGCNKRYFKLLSHLQMHSRHKTG (SEQ ID NO: 10), CNKRYFKLLSHLQMHSRK (SEQ ID NO: 22), CNKRYFKLLSHLQMHSRKH (SEQ ID NO: 23) and CNKRYFKLLSHLQMHSRRKHTG (SEQ ID NO: 24) Or a modified amino acid containing a modification of an amino acid residue in any one of the amino acid sequences selected from SEQ ID NOs: 10 to 11 and 19 to 24 Item 26.
- Cancer antigen peptide C has the following amino acid sequence: SGQARMFPNAPYLPSC (SEQ ID NO: 19), SGQAYMFPNAPYLPSC (SEQ ID NO: 25), SGQARMFPNAPYLPSCLES (SEQ ID NO: 11), SGQAYMFPNAPYLPSCLES (SEQ ID NO: 12), PGCNKRYFKLLSHLQMHSRK (SEQ ID NO: 20), PGCNKRYFKLSHHLQMHSRKH (SEQ ID NO: 21), PGCNKRYFKLLSHLQMHSRHKTG (SEQ ID NO: 10), CNKRYFKLLSHLQMHSRK (SEQ ID NO: 22), CNKRYFKLLSHLQMHSRKH (SEQ ID NO: 23) and CNKRYFKLLSHLQMHSRRKHTG (SEQ ID NO: 24)
- Item 29 A pharmaceutical composition comprising the compound according to any one of Items 1 to 28 or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier;
- Item 30 A pharmaceutical composition according to Item 29, which is used as a cancer vaccine;
- Item 31 Use of the compound according to any one of Items 1 to 28 or a pharmaceutically acceptable salt thereof for producing a cancer vaccine;
- Item 32 A method for treating or preventing cancer, wherein WT1 in need thereof is an amount effective for the treatment or prevention of a compound according to any one of Items 1 to 28 or a pharmaceutically acceptable salt thereof.
- a method comprising administering to a positive cancer patient; and
- Item 33 The compound according to any one of Items 1 to 28 or a pharmaceutically acceptable salt thereof is reacted with ERAP1 to thereby produce two different MHC class I restricted epitopes or MHC class I restricted epitopes and MHC class II.
- X a and Y a independently represent a single bond or a divalent group of a peptide consisting of amino acids of 1 to 4 residues, and the number of amino acid residues of X a and the number of amino acid residues of Y a The sum of is an integer from 0 to 4, Cancer antigen peptide A represents MHC class I-restricted WT1 peptide consisting of an amino acid of 7 to 30 residues, the amino group of the N-terminal amino acid of the cancer antigen peptide A bound to Y a in the formula (1), cancer The carbonyl group of the C-terminal amino acid of antigen peptide A is bonded to the hydroxyl group in formula (1), R 1 is a hydrogen atom, Formula (2):
- Cancer antigen peptide B represents an MHC class I-restricted WT1 peptide having a sequence different from that of cancer antigen peptide A and consisting of 7 to 30 amino acids.
- the amino group of the N-terminal amino acid of cancer antigen peptide B is represented by the formula (2 ) binds to Y b in, the carbonyl group of the C-terminal amino acids of the cancer antigen peptide B bound to the hydroxyl group in the formula (2), The thioether group in formula (2) is bonded to the thioether group in formula (1).
- a cancer antigen peptide C Cancer antigen peptide C is different in sequence from cancer antigen peptide A and has a MHC class I-restricted WT1 peptide consisting of 7 to 30 amino acids containing one cysteine residue or 7 to 30 containing one cysteine residue.
- X a is a divalent group of a peptide consisting of two amino acids and Y a is a single bond, or X a and Y a are independently a divalent group of a peptide consisting of one amino acid Or X a is a single bond and Y a is a divalent group of a peptide consisting of two amino acids, or X a is a divalent group of a peptide consisting of one amino acid and Y a is or a single bond, or X a is a divalent radical of a peptide and Y a is a single bond comprises the amino acid of one residue, or X a and Y a is a single bond, according to claim 1 A compound, or a pharmaceutically acceptable salt thereof;
- Item 3 The compound according to Item 1 or 2, or a pharmaceutically acceptable salt thereof, wherein X a is a single bond and Y a is a single bond, an alanine residue, a leucine residue or a methionine residue;
- Item 4 The compound according to Item 1 or 2, or a pharmaceutically acceptable salt thereof, wherein X a is a single bond or a divalent group of a peptide consisting of one amino acid and Y a is a single bond;
- Item 5 The compound according to any one of Items 1 to 4, wherein X a and Y a are a single bond, or a pharmaceutically acceptable salt thereof;
- Item 6 The compound according to any one of Items 1 to 5, or a pharmaceutically acceptable salt thereof, wherein the cancer antigen peptide A is an MHC class I-restricted WT1 peptide consisting of 7 to 15 amino acids.
- Cancer antigen peptide A has the following amino acid sequence: RMFPNAPYL (SEQ ID NO: 2), CMTWNQMNL (SEQ ID NO: 3), ALLPAVPSL (SEQ ID NO: 5), SLGEQQYSV (SEQ ID NO: 6) and RVPGVAPTL (SEQ ID NO: 7)
- RMFPNAPYL SEQ ID NO: 2
- CMTWNQMNL SEQ ID NO: 3
- ALLPAVPSL SEQ ID NO: 5
- SLGEQQYSV SEQ ID NO: 6
- RVPGVAPTL SEQ ID NO: 7
- Cancer antigen peptide A has the following amino acid sequence: RMFPNAPYL (SEQ ID NO: 2), CMTWNQMNL (SEQ ID NO: 3), CYTWNQMNL (SEQ ID NO: 4), ALLPAVPSL (SEQ ID NO: 5), SLGEQQYSV (SEQ ID NO: 6) and RVPGVAPTL (SEQ ID NO: 7)
- RMFPNAPYL SEQ ID NO: 2
- CMTWNQMNL SEQ ID NO: 3
- CYTWNQMNL SEQ ID NO: 4
- ALLPAVPSL SEQ ID NO: 5
- SLGEQQYSV SEQ ID NO: 6
- RVPGVAPTL SEQ ID NO: 7
- Item 8 The compound according to any one of Items 1 to 7, or a pharmaceutically acceptable salt thereof, which is a peptide consisting of any amino acid sequence selected from
- Item 9 The compound according to any one of Items 1 to 8, wherein R 1 is a hydrogen atom, or a pharmaceutically acceptable salt thereof;
- the compound represented by the formula (1) has the following amino acid sequence: CRMFPNAPYL (SEQ ID NO: 13), CCMTWNQMNL (SEQ ID NO: 14), CCYTWNQMNL (SEQ ID NO: 15), CALLPAVPSL (SEQ ID NO: 16), CSLGEQQYSV (SEQ ID NO: 17) and CRVPGVAPTL (SEQ ID NO: 18) Item 10.
- Item 11 The compound according to any one of Items 1 to 8, or a pharmaceutically acceptable salt thereof, wherein R 1 is a group represented by Formula (2);
- X b is a divalent group of a peptide consisting of two amino acids and Y b is a single bond, or X b and Y b are independently a divalent group of a peptide consisting of one amino acid Or X b is a single bond and Y b is a divalent group of a peptide consisting of two amino acids, or X b is a divalent group of a peptide consisting of one amino acid and Y b is Item 1-8, wherein X is a single bond, X b is a single bond and Y b is a divalent group of a peptide consisting of one amino acid, or X b and Y b are a single bond 11.
- Item 13 The compound according to any one of Items 1 to 8 and 11 to 12, wherein X b is a single bond and Y b is a single bond, an alanine residue, a leucine residue or a methionine residue, or a pharmaceutically acceptable salt thereof Acceptable salts;
- Item 14 The compound according to any one of Items 1 to 8 and 11 to 12, wherein X b is a single bond or a divalent group of a peptide consisting of an amino acid having one residue, and Y b is a single bond, or a pharmaceutical thereof Top acceptable salts;
- Item 15 The compound according to any one of Items 1 to 8 and 11 to 14, or a pharmaceutically acceptable salt thereof, wherein X b and Y b are a single bond;
- Item 16 The compound according to any one of Items 1 to 8 and 11 to 15, or a pharmaceutically acceptable salt thereof, wherein the cancer antigen peptide B is an MHC class I-restricted WT1 peptide consisting of 7 to 15 amino acids. ;
- Cancer antigen peptide B has the following amino acid sequence: RMFPNAPYL (SEQ ID NO: 2), CMTWNQMNL (SEQ ID NO: 3), ALLPAVPSL (SEQ ID NO: 5), SLGEQQYSV (SEQ ID NO: 6) and RVPGVAPTL (SEQ ID NO: 7)
- RMFPNAPYL SEQ ID NO: 2
- CMTWNQMNL SEQ ID NO: 3
- ALLPAVPSL SEQ ID NO: 5
- SLGEQQYSV SEQ ID NO: 6
- RVPGVAPTL SEQ ID NO: 7
- Cancer antigen peptide B has the following amino acid sequence: RMFPNAPYL (SEQ ID NO: 2), CMTWNQMNL (SEQ ID NO: 3), CYTWNQMNL (SEQ ID NO: 4), ALLPAVPSL (SEQ ID NO: 5), SLGEQQYSV (SEQ ID NO: 6) and RVPGVAPTL (SEQ ID NO: 7) Item 18.
- RMFPNAPYL SEQ ID NO: 2
- CMTWNQMNL SEQ ID NO: 3
- CYTWNQMNL SEQ ID NO: 4
- ALLPAVPSL SEQ ID NO: 5
- SLGEQQYSV SEQ ID NO: 6
- RVPGVAPTL SEQ ID NO: 7
- Item 20 The compound according to Item 13, or a pharmaceutically acceptable salt thereof, wherein Y b is an alanine residue;
- cancer antigen peptide B is an MHC class I-restricted WT1 peptide containing one cysteine residue
- the thioether group in cancer antigen peptide B is represented by formula (16):
- X d and Y d independently represent a single bond or a divalent group of a peptide consisting of 1 to 4 amino acids, and the number of amino acid residues of X d and the number of amino acid residues of Y d The sum of is an integer from 0 to 4, Cancer antigen peptide D represents an MHC class II-restricted WT1 peptide consisting of 7 to 30 amino acid residues, and the amino group of the N-terminal amino acid of cancer antigen peptide D binds to Y d in formula (16), The carbonyl group of the C-terminal amino acid of antigen peptide D is bonded to the hydroxyl group in formula (16).
- cancer antigen peptide E which is an MHC class II-restricted WT1 peptide consisting of 7 to 30 amino acid amino acids that are bound to the thioether group in it or that contains one cysteine residue
- Item 22 The compound according to Item 21, or a pharmaceutically acceptable salt thereof, wherein the cancer antigen peptide B is an MHC class I-restricted WT1 peptide consisting of 7 to 15 amino acids.
- Cancer antigen peptide B has the following amino acid sequence: CMTWNQMNL (SEQ ID NO: 3) and CYTWNQMNL (SEQ ID NO: 4) Item 23.
- X d is a divalent group of a peptide consisting of two amino acids and Y d is a single bond, or X d and Y d are independently a divalent group of a peptide consisting of one amino acid Or X d is a single bond and Y d is a divalent group of a peptide consisting of two amino acids, or X d is a divalent group of a peptide consisting of one amino acid and Y d is Item 21-23, wherein X is a single bond, X d is a single bond and Y d is a divalent group of a peptide consisting of one amino acid residue, or X d and Y d are a single bond A compound according to any one of the above, or a pharmaceutically acceptable salt thereof;
- Item 25 The compound according to any one of Items 21 to 24, or a pharmaceutically acceptable salt thereof, wherein X d is a single bond, and Y d is a single bond, an alanine residue, a leucine residue or a methionine residue. ;
- Item 26 The compound according to any one of Items 21 to 24, or a pharmaceutically acceptable salt thereof, wherein X d is a single bond or a divalent group of a peptide consisting of an amino acid having one residue, and Y d is a single bond. salt;
- Item 27 The compound according to any one of Items 21 to 26, or a pharmaceutically acceptable salt thereof, wherein X d and Y d are a single bond;
- Item 28 The compound according to any one of Items 21 to 27, or a pharmaceutically acceptable salt thereof, wherein the cancer antigen peptide D is an MHC class II-restricted WT1 peptide consisting of amino acids of 14 to 30 residues;
- Cancer antigen peptide D has the following amino acid sequence: SGQARMFPNAPYLPSC (SEQ ID NO: 19), SGQAYMFPNAPYLPSC (SEQ ID NO: 25), SGQARMFPNAPYLPSCLES (SEQ ID NO: 11), SGQAYMFPNAPYLPSCLES (SEQ ID NO: 12), PGCNKRYFKLLSHLQMHSRK (SEQ ID NO: 20), PGCNKRYFKLSHHLQMHSRKH (SEQ ID NO: 21), PGCNKRYFKLLSHLQMHSRHKTG (SEQ ID NO: 10), CNKRYFKLLSHLQMHSRK (SEQ ID NO: 22), CNKRYFKLLSHLQMHSRKH (SEQ ID NO: 23), CNKRYFKLSHLQMHSRKHTG (SEQ ID NO: 24) and WAPVLDFAPPGASAYGSL (SEQ ID NO: 244) Item 29.
- Item 31 The compound according to any one of Items 21 to 23, or a pharmaceutically acceptable salt thereof, wherein the cancer antigen peptide E is a MHC class II-restricted WT1 peptide consisting of 14 to 30 amino acids.
- Cancer antigen peptide E has the following amino acid sequence: SGQARMFPNAPYLPSC (SEQ ID NO: 19), SGQAYMFPNAPYLPSC (SEQ ID NO: 25), SGQARMFPNAPYLPSCLES (SEQ ID NO: 11), SGQAYMFPNAPYLPSCLES (SEQ ID NO: 12), PGCNKRYFKLLSHLQMHSRK (SEQ ID NO: 20), PGCNKRYFKLSHHLQMHSRKH (SEQ ID NO: 21), PGCNKRYFKLLSHLQMHSRHKTG (SEQ ID NO: 10), CNKRYFKLLSHLQMHSRK (SEQ ID NO: 22), CNKRYFKLLSHLQMHSRKH (SEQ ID NO: 23) and CNKRYFKLLSHLQMHSRRKHTG (SEQ ID NO: 24) Item 32.
- the compound or a pharmaceutically acceptable salt thereof according to any one of Items 21 to 23 and 31, which is a peptide consisting
- Item 33 The compound according to any one of Items 1 to 8, wherein R 1 is cancer antigen peptide C, or a pharmaceutically acceptable salt thereof;
- Item 34 The compound according to any one of Items 1 to 8 and 33, or a pharmaceutically acceptable salt thereof, wherein the cancer antigen peptide C is an MHC class I-restricted WT1 peptide consisting of 7 to 15 amino acids.
- Cancer antigen peptide C has the following amino acid sequence: CMTWNQMNL (SEQ ID NO: 3) Any one of Items 1 to 8 and 33 to 34, which is a peptide comprising a modified amino acid sequence containing a modified amino acid residue in the amino acid sequence of SEQ ID NO: 3 and having a CTL-inducing activity Or a pharmaceutically acceptable salt thereof;
- Cancer antigen peptide C has the following amino acid sequence: CMTWNQMNL (SEQ ID NO: 3) and CYTWNQMNL (SEQ ID NO: 4) Item 36.
- X d and Y d independently represent a single bond or a divalent group of a peptide consisting of 1 to 4 amino acids, and the number of amino acid residues of X d and the number of amino acid residues of Y d The sum of is an integer from 0 to 4, Cancer antigen peptide D represents an MHC class II-restricted WT1 peptide consisting of 7 to 30 amino acid residues, and the amino group of the N-terminal amino acid of cancer antigen peptide D binds to Y d in formula (16), The carbonyl group of the C-terminal amino acid of antigen peptide D is bonded to the hydroxyl group in formula (16).
- cancer antigen peptide E which is an MHC class II-restricted WT1 peptide consisting of 7 to 30 amino acid amino acids that are bound to the thioether group in it or that contains one cysteine residue
- WT1 peptide an MHC class II-restricted WT1 peptide consisting of 7 to 30 amino acid amino acids that are bound to the thioether group in it or that contains one cysteine residue
- Item 39 The compound according to Item 38, wherein the peptide consisting of 1 to 4 amino acids including one cysteine residue bonded to the N-terminus of cancer antigen peptide C is a dipeptide consisting of CA, or a pharmaceutically acceptable salt thereof Salt to be made;
- Item 40 40.
- Cancer antigen peptide C has the following amino acid sequence: CMTWNQMNL (SEQ ID NO: 3) and CYTWNQMNL (SEQ ID NO: 4) Item 41.
- X d is a divalent group of a peptide consisting of two amino acids and Y d is a single bond, or X d and Y d are independently a divalent group of a peptide consisting of one amino acid Or X d is a single bond and Y d is a divalent group of a peptide consisting of two amino acids, or X d is a divalent group of a peptide consisting of one amino acid and Y d is Item 38-41, wherein X is a single bond, X d is a single bond and Y d is a divalent group of a peptide consisting of one amino acid residue, or X d and Y d are a single bond A compound according to any one of the above, or a pharmaceutically acceptable salt thereof;
- Item 43 The compound according to any one of Items 38 to 42, or a pharmaceutically acceptable salt thereof, wherein X d is a single bond, and Y d is a single bond, an alanine residue, a leucine residue or a methionine residue. ;
- Item 44 The compound according to any one of Items 38 to 42, or a pharmaceutically acceptable salt thereof, wherein X d is a single bond or a divalent group of a peptide consisting of an amino acid having one residue, and Y d is a single bond. salt;
- Item 45 The compound according to any one of Items 38 to 44, or a pharmaceutically acceptable salt thereof, wherein X d and Y d are a single bond;
- Item 46 The compound according to any one of Items 38 to 45, or a pharmaceutically acceptable salt thereof, wherein the cancer antigen peptide D is an MHC class II-restricted WT1 peptide consisting of 14 to 30 amino acids;
- Cancer antigen peptide D has the following amino acid sequence: SGQARMFPNAPYLPSC (SEQ ID NO: 19), SGQAYMFPNAPYLPSC (SEQ ID NO: 25), SGQARMFPNAPYLPSCLES (SEQ ID NO: 11), SGQAYMFPNAPYLPSCLES (SEQ ID NO: 12), PGCNKRYFKLLSHLQMHSRK (SEQ ID NO: 20), PGCNKRYFKLSHHLQMHSRKH (SEQ ID NO: 21), PGCNKRYFKLLSHLQMHSRHKTG (SEQ ID NO: 10), CNKRYFKLLSHLQMHSRK (SEQ ID NO: 22), CNKRYFKLLSHLQMHSRKH (SEQ ID NO: 23), CNKRYFKLSHLQMHSRKHTG (SEQ ID NO: 24) and WAPVLDFAPPGASAYGSL (SEQ ID NO: 244) Item 46.
- Cancer antigen peptide E has the following amino acid sequence: SGQARMFPNAPYLPSC (SEQ ID NO: 19), SGQAYMFPNAPYLPSC (SEQ ID NO: 25), SGQARMFPNAPYLPSCLES (SEQ ID NO: 11), SGQAYMFPNAPYLPSCLES (SEQ ID NO: 12), PGCNKRYFKLLSHLQMHSRK (SEQ ID NO: 20), PGCNKRYFKLSHHLQMHSRKH (SEQ ID NO: 21), PGCNKRYFKLLSHLQMHSRHKTG (SEQ ID NO: 10), CNKRYFKLLSHLQMHSRK (SEQ ID NO: 22), CNKRYFKLLSHLQMHSRKH (SEQ ID NO: 23) and CNKRYFKLLSHLQMHSRRKHTG (SEQ ID NO: 24) 45.
- Item 51 The compound according to any one of Items 1 to 8 and 33, or a pharmaceutically acceptable salt thereof, wherein the cancer antigen peptide C is an MHC class II-restricted WT1 peptide consisting of 14 to 30 amino acids.
- Cancer antigen peptide C has the following amino acid sequence: SGQARMFPNAPYLPSC (SEQ ID NO: 19), SGQARMFPNAPYLPSCLES (SEQ ID NO: 11), PGCNKRYFKLLSHLQMHSRK (SEQ ID NO: 20), PGCNKRYFKLSHHLQMHSRKH (SEQ ID NO: 21), PGCNKRYFKLLSHLQMHSRHKTG (SEQ ID NO: 10), CNKRYFKLLSHLQMHSRK (SEQ ID NO: 22), CNKRYFKLLSHLQMHSRKH (SEQ ID NO: 23) and CNKRYFKLLSHLQMHSRRKHTG (SEQ ID NO: 24) Or a modified amino acid containing a modification of an amino acid residue in any one of the amino acid sequences selected from SEQ ID NOs: 10 to 11 and 19 to 24 52.
- Cancer antigen peptide C has the following amino acid sequence: SGQARMFPNAPYLPSC (SEQ ID NO: 19), SGQAYMFPNAPYLPSC (SEQ ID NO: 25), SGQARMFPNAPYLPSCLES (SEQ ID NO: 11), SGQAYMFPNAPYLPSCLES (SEQ ID NO: 12), PGCNKRYFKLLSHLQMHSRK (SEQ ID NO: 20), PGCNKRYFKLSHHLQMHSRKH (SEQ ID NO: 21), PGCNKRYFKLLSHLQMHSRHKTG (SEQ ID NO: 10), CNKRYFKLLSHLQMHSRK (SEQ ID NO: 22), CNKRYFKLLSHLQMHSRKH (SEQ ID NO: 23) and CNKRYFKLLSHLQMHSRRKHTG (SEQ ID NO: 24) Item 53.
- Item 56 The following amino acid sequence: CWAPVLDFAPPGASAYGSL (SEQ ID NO: 242) and WAPVLDFAPPGASAYGSLC (SEQ ID NO: 243) The variant according to Item 55, wherein
- the bond between C and C represents a disulfide bond.
- a composition comprising a peptide consisting of an amino acid sequence selected from the group consisting of:
- a pharmaceutical composition comprising the compound according to any one of Items 1 to 54 and 57 or a pharmaceutically acceptable salt thereof, or the composition according to Item 58, and a pharmaceutically acceptable carrier;
- Item 60 Item 60.
- Item 62 A method for treating or preventing cancer, which is effective for treating or preventing the compound according to any one of Items 1 to 54 and 57 or a pharmaceutically acceptable salt thereof or the composition according to Item 58.
- a method comprising administering to a WT1-positive cancer patient in need thereof;
- Item 63 The compound according to any one of Items 1 to 54 and 57 or a pharmaceutically acceptable salt thereof is reacted with ERAP1 to thereby produce two different MHC class I restricted epitopes or MHC class I restricted epitopes and MHC.
- ERAP1 a pharmaceutically acceptable salt thereof
- Item 64 A method for synthesizing a compound comprising the following steps: (1) Using Fmoc-C (Mmt) A-SBn and cancer antigen peptide C, a peptide in which the carbonyl group of the C-terminal amino acid of C (Mmt) A and the N-terminal amino group of cancer antigen peptide C are combined is synthesized.
- the antigen peptide C consists of an MHC class I-restricted WT1 peptide consisting of 7-30 amino acids containing one cysteine residue or an amino acid 7-30 residues containing one cysteine residue Representing an MHC class II restricted WT1 peptide; (2) Using the peptide obtained in the step (1) and the cancer antigen peptide A in which one cysteine residue protected with an Npys group is bonded to the N-terminus, the peptide was obtained in the step (1).
- a step representing an MHC class I-restricted WT1 peptide comprising 7 to 30 amino acids and (3) a cancer antigen peptide comprising the peptide obtained in the step (2) and a cysteine residue protected with an SPy group
- the thioether group of the cysteine residue bound to the N-terminus of the cancer antigen peptide A in the peptide obtained in the step (2) and the cancer antigen peptide D A process for synthesizing a peptide in which a thioether group of a stain residue is bound, wherein the cancer antigen peptide D is an MHC class II constrain consisting of 7 to 30 amino acids with one cysteine residue bound to the N-
- Cancer antigen peptide A has the following amino acid sequence: RMFPNAPYL (SEQ ID NO: 2), ALLPAVPSL (SEQ ID NO: 5), SLGEQQYSV (SEQ ID NO: 6) and RVPGVAPTL (SEQ ID NO: 7) It represents a peptide consisting of any amino acid sequence selected from the group consisting of, the amino group of the N-terminal amino acid of the cancer antigen peptide A bound to Y a in the formula (1), the C-terminal amino acids of the cancer antigen peptide A carbonyl A group bonded to a hydroxyl group in formula (1), R 1 represents cancer antigen peptide C; Cancer antigen peptide C is different in sequence from cancer antigen peptide A and has the following amino acid sequence: CMTWNQMNL (SEQ ID NO: 3) and CYTWNQMNL (SEQ ID NO: 4) The thioether group of the cysteine residue of cancer
- Item 4. A pharmaceutical composition comprising the compound according to any one of Items 1 to 3 or a pharmaceutically acceptable salt thereof, and a pharmaceutically acceptable carrier;
- Item 5 A pharmaceutical composition according to Item 4, The following amino acid sequence: CNKRYFKLLSHLQMHSRK (SEQ ID NO: 22), CNKRYFKLLSHLQMHSRKH (SEQ ID NO: 23), CNKRYFKLLSHLQMHSRKHTG (SEQ ID NO: 24), WAPVLDFAPPGASAYGSL (SEQ ID NO: 244), CWAPVLDFAPPGASAYGSL (SEQ ID NO: 242) and WAPVLDFAPPGASAYGSLC (SEQ ID NO: 243), A composition comprising one or more peptides consisting of an amino acid sequence selected from the group consisting of:
- the present invention it has become possible to provide a compound represented by the above formula (1) useful as a cancer immunotherapeutic agent (hereinafter sometimes referred to as the compound of the present invention).
- the compounds of the present invention have made it possible to provide cancer vaccines and cancer immunotherapeutic agents that efficiently induce CTLs in vivo and in vitro.
- the compounds of the present invention provide two MHC class I-restricted WT1 peptides with different sequences or two MHC class I-restricted WT1 epitopes with different sequences, MHC class IWT1-restricted peptides and MHC class II-restricted WT1 peptides, MHC class IWT1-restricted WT1 epitope and MHC class II-restricted WT1 epitope, two MHC class I-restricted WT1 peptides and MHC class II-restricted WT1 peptides with different sequences, or two MHC class I-restricted WT1 epitopes with different sequences
- MHC class II restricted WT1 epitopes can be generated in vivo and in vitro to efficiently induce CTLs.
- the present invention can be combined with an A02 type (A-0201, A0206, etc.) peptide and an A24 type (A-2402, etc.) peptide.
- the compound (conjugate) is particularly preferred.
- population that is HLA-A0201 type or HLA-A0206 type is the largest with about 47%, then HLA-A2402 type is about 13%, and the sum of these types is duplicated (ie, Excluding humans with both types, accounting for about 56% (Human Immunol. 62: 1009; 2001).
- the population with HLA-A2402 is the largest with about 60%, followed by HLA-A0201 or HLA-A0206 with about 39%. Excluding humans having a double count), it accounts for about 81% (www.bmdc.irc.or.jp/GF-A.htm). Therefore, the advantages of the compounds of the present invention include, in particular, the advantage of covering a larger population with one compound of the present invention, and it is essential to select the patient's HLA subtype prior to administration. The advantage that it can be eliminated.
- the compound represented by the formula (3), the formula (4) or the formula (5) is preferable, and the compound represented by the formula (5) is more preferable.
- the compound of the present invention makes it possible to provide an active ingredient of a cancer vaccine that is excellent in physicochemical properties and stability, and easy to manufacture and control. This also facilitated the formulation of cancer vaccines.
- the physicochemical properties include solubility, viscosity of the solution, concomitant ease of purification, ease of handling after lyophilization, concomitant ease of purification, and the like.
- Stability includes stability after salt substitution, hygroscopicity, thermal stability, stability after emulsion formation, and the like.
- examples of the pharmacological activity include drug efficacy as a cancer vaccine, differences caused by API (Active Pharmaceutical Ingredient), interaction with additives in the preparation, and the like.
- the difference caused by API is a difference as a cancer vaccine by API.
- APIs having greatly different solubilities tend to precipitate, and are essential for pharmaceuticals.
- the possibility that sterilization by filtration of a certain membrane filter cannot be expected is sufficiently expected.
- the amount of API contained in the filtrate is greatly reduced, and the CTL inducing ability essential as a cancer vaccine is also significantly reduced. Therefore, an API having a low solubility can easily be expected to have a disadvantage that the production efficiency is remarkably lowered.
- FIG. 1 is a diagram showing the results of testing the time-dependent change in trimming of the N-terminal amino acid by ERAP1 for each of the peptides of SEQ ID NOs: 13, 16, 17 and 18 synthesized in Examples 2 to 5 in Test Example 1. is there.
- FIG. 2 is a test example 2 in which the compound represented by the formula (5) synthesized in Example 1 was tested for in vivo CTL inducing ability by IFN ⁇ ELISPOT assay using HLA-A0201 transgenic mice. It is a figure which shows a result.
- FIG. 1 is a diagram showing the results of testing the time-dependent change in trimming of the N-terminal amino acid by ERAP1 for each of the peptides of SEQ ID NOs: 13, 16, 17 and 18 synthesized in Examples 2 to 5 in Test Example 1. is there.
- FIG. 2 is a test example 2 in which the compound represented by the formula (5) synthesized in Example 1 was tested for in vivo CTL inducing ability by IFN ⁇ ELI
- FIG. 3 is a graph showing the in vivo CTL inducing ability of the compound represented by the formula (5) synthesized in Example 1 in Test Example 2 using an IFN ⁇ ELISPOT assay using HLA-A2402 transgenic mice. It is a figure which shows a result.
- FIG. 4 shows the in vivo CTL inducing ability of the compound represented by the formula (3) synthesized in Example 6 in Test Example 4 using IFN ⁇ ELISPOT assay using HLA-A0201 transgenic mice. It is a figure which shows a result.
- FIG. 5 shows that, in Test Example 5, an HLA-A0201 transgenic mouse in which the compound of Formula (6) synthesized in Example 7 was pulsed or non-pulsed with the peptide of SEQ ID NO: 2 was used.
- FIG. 6 shows that in Example 5 for the compound represented by formula (6) synthesized in Example 7, HLA-A0201 transgenic mice were used in the pulse or non-pulse of the peptide of SEQ ID NO: 24. It is a figure which shows the result of having tested the inducibility of the peptide-reactive cell of SEQ ID NO: 24 in vivo by IFN ⁇ ⁇ ⁇ ⁇ ELISPOT assay.
- FIG. 6 shows that in Example 5 for the compound represented by formula (6) synthesized in Example 7, HLA-A0201 transgenic mice were used in the pulse or non-pulse of the peptide of SEQ ID NO: 24. It is a figure which shows the result of having tested the inducibility of the peptide-reactive cell of SEQ ID NO: 24 in vivo by IFN ⁇ ⁇ ⁇ ⁇ ELISPOT assay.
- Example 7 shows that in Example 6, an HLA-A0201 transgenic mouse in which the compound of formula (8) synthesized in Example 9 was pulsed or non-pulsed with the peptide of SEQ ID NO: 2 was used. It is a figure which shows the result of having tested the CTL inducibility in vivo by IFN ⁇ ELISPOT assay.
- FIG. 8 shows that, in Test Example 6, an HLA-A0201 transgenic mouse in which the compound represented by the formula (8) synthesized in Example 9 was pulsed or non-pulsed with the peptide of SEQ ID NO: 22 was used.
- FIG. 9 shows that in Test Example 8, an HLA-A0201 transgenic mouse in which the compound of formula (7) synthesized in Example 8 was pulsed or non-pulsed with the peptide of SEQ ID NO: 2 was used. It is a figure which shows the result of having tested the CTL inducibility in vivo by IFN ⁇ ELISPOT assay.
- FIG. 10 shows that, in Test Example 8, an HLA-A0201 transgenic mouse in which the compound represented by Formula (7) synthesized in Example 8 was pulsed or non-pulsed with the peptide of SEQ ID NO: 23 was used. It is a figure which shows the result of having tested the induction
- FIG. 11 shows that, in Test Example 9, an HLA-A0201 transgenic mouse in which the compound of Formula (9) synthesized in Example 10 was pulsed or non-pulsed with the peptide of SEQ ID NO: 5 was used.
- FIG. 12 shows that in Example 9, an HLA-A0201 transgenic mouse in which the compound of formula (9) synthesized in Example 10 was pulsed or non-pulsed with the peptide of SEQ ID NO: 24 was used. It is a figure which shows the result of having tested the inducibility of the peptide-reactive cell of SEQ ID NO: 24 in vivo by IFN ⁇ ⁇ ⁇ ⁇ ELISPOT assay.
- FIG. 12 shows that in Example 9, an HLA-A0201 transgenic mouse in which the compound of formula (9) synthesized in Example 10 was pulsed or non-pulsed with the peptide of SEQ ID NO: 24 was used. It is a figure which shows the result of having tested the inducibility of the peptide-reactive cell of SEQ ID NO: 24 in vivo by IFN ⁇ ⁇ ⁇ ⁇ ELISPOT assay.
- FIG. 12 shows that in Example 9, an HLA-A0201 transgenic mouse in which the compound of formula (9) synthesized in Example 10 was pulse
- FIG. 13 shows HLA-A0201 gene introduction in the pulse of the peptide of SEQ ID NO: 2 or pulsed non-pulse for the peptide represented by SEQ ID NO: 238 and 239 synthesized in Reference Examples 8 and 9 in Comparative Example 1. It is a figure which shows the result of having tested the CTL inducibility in vivo by IFN (gamma) * ELISPOT assay using a mouse
- FIG. 14 shows the introduction of HLA-A2402 gene in the pulse of pulse of SEQ ID NO: 4 or non-pulse with respect to the peptide represented by SEQ ID NO: 238 and 239 synthesized in Reference Examples 8 and 9 in Comparative Example 1.
- FIG. 15 shows the introduction of HLA-A0201 gene in the pulse of pulse of SEQ ID NO: 2 or non-pulse in the peptide of SEQ ID NO: 240 and 241 synthesized in Reference Examples 10 and 11 in Comparative Example 2. It is a figure which shows the result of having tested the CTL inducibility in vivo by IFN (gamma) * ELISPOT assay using a mouse
- FIG. 15 shows the introduction of HLA-A0201 gene in the pulse of pulse of SEQ ID NO: 2 or non-pulse in the peptide of SEQ ID NO: 240 and 241 synthesized in Reference Examples 10 and 11 in Comparative Example 2. It is a figure which shows the result of having tested the CTL inducibility in vivo by IFN (gamma) * ELISPOT assay using a mouse
- FIG. 16 shows HLA-A2402 gene introduction in the pulse of the peptide of SEQ ID NO: 4 or non-pulse with respect to the peptide represented by SEQ ID NO: 240 and 241 synthesized in Reference Examples 10 and 11 in Comparative Example 2. It is a figure which shows the result of having tested the CTL inducibility in vivo by IFN (gamma) * ELISPOT assay using a mouse
- FIG. 17 shows that in Example 11, an HLA-A0201 transgenic mouse in which the compound of formula (10) synthesized in Example 13 was pulsed or non-pulsed with the peptide of SEQ ID NO: 2 was used.
- FIG. 18 shows that in Comparative Example 3, the compound represented by the formula (11) synthesized in Reference Example 12 was used with an HLA-A0201 transgenic mouse in which the peptide of SEQ ID NO: 2 was pulsed or non-pulsed. It is a figure which shows the result of having tested the CTL inducibility in vivo by IFN ⁇ ELISPOT assay.
- FIG. 19 shows that in Example 12, the HLA-A0201 transgenic mouse in which the compound represented by the formula (12) synthesized in Example 14 was pulsed or non-pulsed with the peptide of SEQ ID NO: 2 was used.
- FIG. 20 shows that in Test Example 12, an HLA-A2402 transgenic mouse in which the compound represented by the formula (12) synthesized in Example 14 was pulsed or non-pulsed with the peptide of SEQ ID NO: 4 was used. It is a figure which shows the result of having tested the CTL inducibility in vivo by IFN ⁇ ELISPOT assay.
- FIG. 21 shows that, in Test Example 13, an HLA-A0201 transgenic mouse in which the compound of Formula (14) synthesized in Example 15 was pulsed or non-pulsed with the peptide of SEQ ID NO: 2 was used.
- FIG. 22 shows that in Example 13, an HLA-A2402 transgenic mouse in which the compound of formula (14) synthesized in Example 15 was pulsed or non-pulsed with the peptide of SEQ ID NO: 4 was used. It is a figure which shows the result of having tested the CTL inducibility in vivo by IFN ⁇ ELISPOT assay.
- FIG. 23 shows the sequence of a cocktail vaccine prepared by mixing the compound represented by formula (5) synthesized in Example 1 and the peptide represented by SEQ ID NO: 22 synthesized in Reference Example 1 in Test Example 14.
- FIG. 24 shows the sequence of a cocktail vaccine prepared by mixing the compound represented by the formula (5) synthesized in Example 1 and the peptide represented by SEQ ID NO: 244 synthesized in Reference Example 13 in Test Example 15. It is a figure which shows the result of having tested the CTL inducibility in vivo by the pulse or non-pulse of the peptide of No. 2 by the IFN ⁇ ELISPOT assay using the HLA-A0201 transgenic mouse.
- FIG. 24 shows the sequence of a cocktail vaccine prepared by mixing the compound represented by the formula (5) synthesized in Example 1 and the peptide represented by SEQ ID NO: 244 synthesized in Reference Example 13 in Test Example 15. It is a figure which shows the result of having tested the CTL inducibility in vivo by the pulse or non-pulse of the peptide of No. 2 by the IFN ⁇ ELISPOT assay using the HLA-A0201 transgenic mouse.
- FIG. 25 shows a cocktail vaccine obtained by mixing the compound represented by formula (5) synthesized in Example 1 and the peptide represented by SEQ ID NO: 24 synthesized in Reference Example 2 in Test Example 16 with SEQ ID NO:
- FIG. 3 is a graph showing the results of testing in vivo CTL inducibility by IFN ⁇ ELISPOT assay using HLA-A0201 transgenic mice with pulsed or non-pulsed peptides of 2.
- 26 shows a cocktail vaccine obtained by mixing the compound represented by formula (5) synthesized in Example 1 and the peptide represented by SEQ ID NO: 242 synthesized in Example 11 in Test Example 17.
- FIG. 3 is a graph showing the results of testing in vivo CTL inducibility by IFN ⁇ ELISPOT assay using HLA-A0201 transgenic mice with pulsed or non-pulsed peptides of 2.
- 26 shows a cocktail vaccine obtained by mixing the compound represented by formula (5) synthesized in Example 1 and the peptide represented by SEQ ID NO: 242
- FIG. 3 is a graph showing the results of testing in vivo CTL inducibility by IFN ⁇ ELISPOT assay using HLA-A0201 transgenic mice with pulsed or non-pulsed peptides of 2.
- FIG. 27 shows a cocktail vaccine obtained by mixing the compound represented by formula (5) synthesized in Example 1 and the peptide represented by SEQ ID NO: 243 synthesized in Example 11 in Test Example 18 with SEQ ID NO:
- FIG. 3 is a graph showing the results of testing in vivo CTL inducibility by IFN ⁇ ELISPOT assay using HLA-A0201 transgenic mice with pulsed or non-pulsed peptides of 2.
- the “amino acid residue” means a part corresponding to one unit of amino acid constituting the peptide or protein on the peptide or protein molecule.
- “Amino acid residue” includes a natural or non-natural ⁇ -amino acid residue, ⁇ -amino acid residue, ⁇ -amino acid residue or ⁇ -amino acid residue. Specific examples include natural ⁇ -amino acid residues, ornithine residues, homoserine residues, homocysteine residues, ⁇ -alanine, ⁇ -aminobutanoic acid or ⁇ -aminopentanoic acid.
- the “amino acid residue” may have an optically active form, it may be either L-form or D-form, but L-form is preferred.
- amino acid residue in the present invention is indicated by an abbreviation, it is described by the following abbreviation.
- Ala or A alanine residue Arg or R: Arginine residue Asn or N: Asparagine residue Asp or D: Aspartic acid residue Cys or C: Cysteine residue Gln or Q: Glutamine residue Glu or E: Glutamic acid residue Gly or G: Glycine residue His or H: histidine residue Ile or I: isoleucine residue Leu or L: Leucine residue Lys or K: Lysine residue Met or M: methionine residue Phe or F: phenylalanine residue Pro or P: proline residue Ser or S: Serine residue Thr or T: Threonine residue Trp or W: Tryptophan residue Tyr or Y: tyrosine residue Val or V: valine residue Abu: 2-aminobutyric acid residue (also referred to as ⁇ -aminobutyric acid residue) Orn: Orn: Orn
- the amino acid sequence of the “peptide” in the present invention is described according to a conventional method such that the amino acid residue of the N-terminal amino acid is located on the left side and the amino acid residue of the C-terminal amino acid is located on the right side.
- the amino group of the amino acid residue of the N-terminal amino acid is bonded to a hydrogen atom
- the carbonyl group of the amino acid residue of the C-terminal amino acid is bonded to a hydroxyl group.
- the divalent group of the peptide means a group bonded through the amino group of the amino acid residue of the N-terminal amino acid and the carbonyl group of the amino acid residue of the C-terminal amino acid.
- the amino group of the amino acid residue of the N-terminal amino acid is a hydrogen atom unless otherwise specified for the peptide corresponding to the partial structure.
- the carbonyl group of the amino acid residue of the C-terminal amino acid is bonded to the hydroxyl group.
- X a and Y a independently represent a single bond or a divalent group of a peptide consisting of amino acids of 1 to 4 residues.
- the sum of the number of amino acid residues amino acid residues and Y a of X a is an integer of 0-4.
- the sum being an integer of 0 means that X a and Y a are a single bond.
- X a and Y a are independently a bivalent group of a peptide consisting of 2 amino acids, X a consists of 3 amino acids If and Y a is a divalent group of the peptide is a divalent radical of a peptide consisting of amino acids 1 residue, a divalent radical of a peptide X a comprises the amino acid 4 residues and Y a is a single bond The case where it is is mentioned.
- the integer of the sum is preferably 0 to 2, more preferably 0 to 1, and most preferably 0. That is, X a and Y a are most preferably a single bond.
- X a is a divalent radical of a peptide consisting of the amino acid of two residues and Y a is a single bond, independently X a and Y a is 1 remaining
- X a and Y a is 1 remaining
- Y a is a divalent group of a peptide consisting of a 2-residue amino acid.
- the integer of the sum is 1, when X a is a divalent group of a peptide consisting of one amino acid and Y a is a single bond, or X a is a single bond and Y a Is a divalent group of a peptide consisting of an amino acid having one residue.
- X a is a single bond and Y a are alanine residues, and be a leucine residue or a methionine residue.
- the “cancer antigen peptide A” in the present invention is an MHC class I-restricted WT1 peptide consisting of 7 to 30 amino acids.
- Cancer antigen peptide A in the formula (1) the amino group of the N-terminal amino acid is bound to Y a in the formula (1), the carbonyl group of the C-terminal amino acid is bound to a hydroxyl group in the formula (1).
- MHC class I restriction in the present invention means a property of inducing CTL by binding to an MHC class I molecule which is a class I of a major histocompatibility complex (MHC).
- MHC is called human leukocyte type antigen (HLA) in humans.
- HLA corresponding to MHC class I molecules is classified into subtypes such as HLA-A, B, Cw, F and G.
- the “MHC class I restriction” preferably includes HLA-A restriction, HLA-B restriction, or HLA-Cw restriction.
- HLA-A polymorphism include 27 or more types such as HLA-A1, HLA-A0201, and HLA-A24.
- HLA-B polymorphism include HLA-B7, HLA-B40, HLA-B4403, etc.
- the HLA-Cw polymorphism includes 10 or more types such as HLA-Cw0301, HLA-Cw0401, and HLA-Cw0602. Among these polymorphisms, HLA-A0201 and HLA-A24 are preferable.
- the “WT1 peptide” in the present invention is a partial peptide consisting of 7 to 30 amino acids continuous in the amino acid sequence of human WT1 represented by SEQ ID NO: 1.
- the “MHC class I-restricted WT1 peptide” in the present invention is a peptide that binds to an MHC class I antigen and is presented as a complex in vitro and / or in vivo, and the complex is a precursor T It means a peptide that induces CTL as a result of being recognized by cells.
- the number of amino acid residues of the “MHC class I-restricted WT1 peptide” is 7 to 30, preferably 7 to 15, more preferably 8 to 12, still more preferably 8 to 11, and most preferably Is 8 or 9.
- MHC class I-restricted WT1 peptide consisting of 7 to 12 or preferably 9-residue amino acids is also referred to as “MHC class I-restricted WT1 epitope”.
- the “MHC class I-restricted WT1 epitope” in the present invention means a peptide itself that is bound to an MHC class I antigen and presented as a complex. That is, the “MHC class I-restricted WT1 peptide” is degraded in vitro and / or in vivo by proteosome and / or protease such as Gamma-Interferon-inductive Lysosomal Thiol Reductase (GILT, GLT).
- GILT Gamma-Interferon-inductive Lysosomal Thiol Reductase
- ERAP1 is also called ERAAP (ER aminopeptidase associated with antigen presentation), and was once also called A-LAP, PILS-AP, or ARTS-1.
- an amino acid having 1 to 23 residues is added to the carbonyl group of the C-terminal amino acid of the “MHC class I-restricted WT1 epitope” consisting of 7 to 12 amino acids. Peptides consisting of 7 to 30 amino acids are preferred.
- MHC class I-restricted WT1 peptide examples include peptides listed in Tables 1 to 44. In each table, “position” indicates the position in the amino acid sequence of human WT1 described in SEQ ID NO: 1.
- MHC class I-restricted WT1 peptide preferably the following amino acid sequence: RMFPNAPYL (SEQ ID NO: 2), CMTWNQMNL (SEQ ID NO: 3), ALLPAVPSL (SEQ ID NO: 5), SLGEQQYSV (SEQ ID NO: 6) and RVPGVAPTL (SEQ ID NO: 7)
- RMFPNAPYL SEQ ID NO: 2
- CMTWNQMNL SEQ ID NO: 3
- ALLPAVPSL SEQ ID NO: 5
- SLGEQQYSV SEQ ID NO: 6
- RVPGVAPTL RMFPNAPYL
- a peptide comprising any amino acid sequence selected from among the above, or a modified amino acid sequence containing a modification of an amino acid residue in any amino acid sequence selected from among SEQ ID NOs: 2, 3, 5, 6 and 7
- a peptide having CTL-inducing activity More preferably, a peptide consisting of any amino acid sequence selected from SEQ ID NOs: 2, 3,
- the “peptide containing an amino acid sequence” means a peptide in which an additional amino acid is added to the N-terminal amino acid and / or C-terminal amino acid of the amino acid sequence as usual.
- a peptide added to the C-terminal side is preferable.
- the “MHC class I-restricted WT1 epitope” is added, addition to the C-terminal side is preferable.
- a peptide containing a modified amino acid sequence containing a modified amino acid residue in the amino acid sequence and having CTL-inducing activity is also referred to as a “modified killer peptide”.
- the modified killer peptide means a peptide that consists of an amino acid sequence in which 1 to 3 amino acids are deleted, substituted and / or added in the amino acid sequence, binds to MHC class I, and induces CTL.
- Examples of the substitution position of the amino acid to be substituted include 1-position (N-terminal), 2-position, 3-position and 9-position in the case of a peptide consisting of 9-residue amino acids.
- the number of amino acids to be added (including insertion) is preferably 1 or 2, more preferably 1.
- a preferred addition position includes the C-terminus.
- the number of amino acids to be deleted is preferably 1.
- the added amino acid or the substituted amino acid may be an unnatural amino acid other than the 20 kinds of amino acids encoded by the gene.
- binding motif there is regularity (binding motif) of the amino acid sequence of a peptide that can bind to the HLA antigen for each polymorphism of the HLA subtype.
- a binding motif of HLA-A24 in a peptide consisting of 8 to 11 amino acids, the amino acid at position 2 is Tyr, Phe, Met or Trp, and the C-terminal amino acid is Phe, Leu, Ile, It is known to be Trp or Met (J. Immunol., 152, p3913, 1994, J. Immunol., 155, p4307, 1994, Immunogenetics, 41, p178, 1995).
- substitution at position 2 with Tyr, Phe, Met or Trp and / or position 9 with Phe, Leu, Ile, Trp or Met is possible.
- the substituted peptide is preferred as the modified killer peptide.
- the amino acid at the 2nd position is Leu or Met and the C-terminal amino acid is Val or Leu in a peptide consisting of 8 to 11 amino acids.
- modified killer peptide examples include the following peptides.
- RYFPNAPYL SEQ ID NO: 223 which is a modified killer peptide of RMFPNAPYL (SEQ ID NO: 2) (see International Publication No. 03/106682);
- FFPNAPYL SEQ ID NO: 224
- RLFPNAPYL SEQ ID NO: 225
- RMMPNAPYL SEQ ID NO: 2236
- RMFPNAPYV SEQ ID NO: 227)
- YMFPNAPYL SEQ ID NO: 228)
- CYTWNQMNL (SEQ ID NO: 4), a modified killer peptide of CMTWNQMNL (SEQ ID NO: 3) (see WO 02/79253); Xaa-Met-Thr-Trp-Asn-Gln-Met-Asn-Leu (SEQ ID NO: 229) (Xaa in this sequence represents Ser or Ala) or Xaa-Tyr-Thr-Trp-Asn-Gln-Met-Asn-Leu (SEQ ID NO: 230) (Xaa in this sequence represents Ser, Ala, Abu, Arg, Lys, Orn, Cit, Leu, Phe or Asn) (see International Publication No. 2004/026897);
- AYLPAVPSL (SEQ ID NO: 231) which is a modified killer peptide of ALLPAVPSL (SEQ ID NO: 5) (see International Publication No. 2003/106682);
- FLGEQQYSV (SEQ ID NO: 232), which is a modified killer peptide of SLGEQQYSV (SEQ ID NO: 6), SMGEQQYSV (SEQ ID NO: 233) or SLMEQQYSV (SEQ ID NO: 234) (see WO 2009/072610); or
- RYPGVAPTL (SEQ ID NO: 235) which is a modified killer peptide of RVPGVAPTL (SEQ ID NO: 7) (see International Publication No. 2003/106682).
- R 1 in the present invention represents a hydrogen atom, a group represented by the above formula (2) or a cancer antigen peptide C, preferably a group represented by the above formula (2) or a cancer antigen peptide C. Is mentioned.
- the sequence is not identical to the partial sequence of WT1 protein.
- the requirement “the sequence is not identical to the partial sequence of WT1 protein” in the formula (1) means that the peptide represented by the formula (1-1) is continuous in the amino acid sequence of human WT1 described in SEQ ID NO: 1. This means that it is not a partial peptide consisting of 8-35 amino acids. That is, the compound of formula (1) in which R 1 is a hydrogen atom is not a partial peptide consisting of 8 to 35 amino acid residues in the amino acid sequence of human WT1 represented by SEQ ID NO: 1.
- the cancer antigen peptide A is the WT1 138-146 peptide.
- the WT1 138-146 peptide has an amino acid sequence of LESQPAIRN (SEQ ID NO: 78), and consists of 9 consecutive amino acids at positions 138 to 146 in the amino acid sequence of human WT1 described in SEQ ID NO: 1. It is a partial peptide.
- C is located at position 137 consecutive on the N-terminal side of the WT1 138-146 peptide.
- WT1 137-146 peptide (CLESQPAIRN) (SEQ ID NO: 236) corresponds to a partial peptide consisting of 10 consecutive amino acids in the amino acid sequence of human WT1 described in SEQ ID NO: 1.
- the requirement “a compound of the formula (1) in which R 1 is a hydrogen atom is a partial peptide consisting of 8- to 35-residue amino acids in the amino acid sequence of human WT1 represented by SEQ ID NO: 1.
- the WT1 137-146 peptide when the cancer antigen peptide A is the WT1 138-146 peptide (LESQPAIRN) (SEQ ID NO: 78) (CLESQPAIRN) (SEQ ID nO: 236) is from being excluded from the compounds of the present invention, X a and Y a do not become single bond simultaneously.
- R 1 is a hydrogen atom
- the following amino acid sequence CRMFPNAPYL (SEQ ID NO: 13), CCMTWNQMNL (SEQ ID NO: 14), CCYTWNQMNL (SEQ ID NO: 15), CALLPAVPSL (SEQ ID NO: 16), CSLGEQQYSV (SEQ ID NO: 17) and CRVPGVAPTL (SEQ ID NO: 18) Peptides consisting of any amino acid sequence selected from among these are preferred.
- X b and “Y b ” independently represent a single bond or a divalent group of a peptide consisting of amino acids of 1 to 4 residues.
- the sum of the number of amino acid residues amino acid residues and Y b of X b is an integer of 0-4. For example, with the sum is an integer of 0 means that X b and Y b is a single bond.
- the sum is an integer of 4, for example, when X b and Y b is a divalent radical of a peptide consisting of amino acids independently 2 residues, X b comprises the amino acid of 3 residues When the peptide is a divalent group and Y b is a peptide divalent group consisting of one amino acid, X b is a peptide divalent group consisting of four amino acids and Y b is a single bond The case where it is is mentioned.
- the integer of the sum is preferably 0 to 2, more preferably 0 to 1, and most preferably 0. That is, it is most preferable that X b and Y b are both single bonds.
- X b is a divalent radical of a peptide consisting of the amino acid of two residues and Y b is a single bond, independently X b and Y b is 1 remaining
- X b is a single bond and Y b is a divalent group of a peptide consisting of two residues of amino acids.
- the integer of the sum is 1, when X b is a divalent group of a peptide consisting of one amino acid and Y b is a single bond, or X b is a single bond and Y b Is a divalent group of a peptide consisting of an amino acid having one residue.
- X b is a single bond and Y b is an alanine residue, and be a leucine residue or a methionine residue.
- the “cancer antigen peptide B” in the present invention is an MHC class I-restricted WT1 peptide consisting of 7 to 30 amino acids.
- the “MHC class I-restricted WT1 peptide” has the same meaning as described above.
- cancer antigen peptide A and cancer antigen peptide B are not simultaneously the same peptide. That is, cancer antigen peptide B is limited by the requirement that “unlike cancer antigen peptide A”.
- the compound of the formula (1) in which R 1 is a group represented by the above formula (2) is assumed to be X a and X Even if b is the same and Y a and Y b are the same, it is not a homodimer but a heterodimer.
- a homodimer means a dimer in which the same peptide monomer is dimerized
- a heterodimer means a dimer in which a different peptide monomer is dimerized.
- N-terminal amino group of the amino acid bound to Y b is in formula (2) (i.e. bound to the formula (1-2) Of these Y b), C-terminal carbonyl group of the amino acid has the formula (2 ) In the hydroxyl group.
- R 1 is a group represented by the formula (2), that is, the compound of the formula (1-2), preferably the formula (3):
- cancer antigen peptide B is an MHC class I-restricted WT1 peptide containing one cysteine residue
- the compound of formula (1) has a thioether group in cancer antigen peptide B, Formula (16):
- bonded with the thioether group of the cysteine residue of cancer antigen peptide E may be sufficient.
- X d and Y d independently represent a single bond or a divalent group of a peptide consisting of amino acids of 1 to 4 residues.
- the sum of the number of amino acid residues amino acid residues and Y d of X d is an integer of 0-4.
- the sum being an integer of 0 means that X d and Y d are a single bond.
- X d and Y d are independently a bivalent group of a peptide consisting of two amino acids
- X d consists of three amino acids
- Y d is a peptide divalent group consisting of one amino acid
- X d is a peptide divalent group consisting of four amino acids
- Y d is a single bond
- the integer of the sum is preferably 0 to 2, more preferably 0 to 1, and most preferably 0. That is, it is most preferable that X d and Y d are both single bonds.
- X d is a divalent group of a peptide consisting of one amino acid and Y d is a single bond, or X d is a single bond and Y d Is a divalent group of a peptide consisting of an amino acid having one residue.
- X d is a single bond and Y d is an alanine residue, a leucine residue or a methionine residue is preferable.
- the “cancer antigen peptide D” in the present invention is an MHC class II-restricted WT1 peptide consisting of 7 to 30 amino acids.
- the amino group of the N-terminal amino acid is bonded to Y d in the formula (16)
- the carbonyl group of the C-terminal amino acid is bonded to the hydroxyl group in the formula (16).
- MHC class II-restricted means the property of inducing helper T cells by binding to MHC class II molecules, and is synonymous with the definition in “cancer antigen peptide C” described later.
- HLA corresponding to MHC class II molecules is classified into subtypes such as HLA-DR, DQ and DP.
- the “MHC class II restriction” preferably includes HLA-DR restriction, HLA-DQ restriction or HLA-DP restriction.
- the “MHC class II-restricted WT1 peptide” in the present invention means a peptide that binds to an MHC class II antigen and induces helper T cells in vitro and / or in vivo.
- the number of amino acid residues of the “MHC class II-restricted WT1 peptide” is 7-30, preferably 14-30.
- the following amino acid sequence SGQARMFPNAPYLPSC (SEQ ID NO: 19), SGQAYMFPNAPYLPSC (SEQ ID NO: 25), SGQARMFPNAPYLPSCLES (SEQ ID NO: 11), SGQAYMFPNAPYLPSCLES (SEQ ID NO: 12), PGCNKRYFKLLSHLQMHSRK (SEQ ID NO: 20), PGCNKRYFKLSHHLQMHSRKH (SEQ ID NO: 21), PGCNKRYFKLLSHLQMHSRHKTG (SEQ ID NO: 10), CNKRYFKLLSHLQMHSRK (SEQ ID NO: 22), CNKRYFKLLSHLQMHSRKH (SEQ ID NO: 23), CNKRYFKLSHLQMHSRKHTG (SEQ ID NO: 24) and WAPVLDFAPPGASAYGSL
- cancer antigen peptide B is an MHC class I-restricted WT1 peptide containing one cysteine residue
- the thioether group in cancer antigen peptide B is As the compound bonded to the thioether group, preferably the formula (15):
- the “cancer antigen peptide E” in the present invention represents an MHC class II-restricted WT1 peptide consisting of 7 to 30 amino acids including one cysteine residue. This is synonymous with the definition of “MHC class II-restricted WT1 peptide consisting of 7 to 30 amino acids including cysteine residues”.
- the following amino acid sequence SGQARMFPNAPYLPSC (SEQ ID NO: 19), SGQAYMFPNAPYLPSC (SEQ ID NO: 25), SGQARMFPNAPYLPSCLES (SEQ ID NO: 11), SGQAYMFPNAPYLPSCLES (SEQ ID NO: 12), PGCNKRYFKLLSHLQMHSRK (SEQ ID NO: 20), PGCNKRYFKLSHHLQMHSRKH (SEQ ID NO: 21), PGCNKRYFKLLSHLQMHSRHKTG (SEQ ID NO: 10), CNKRYFKLLSHLQMHSRK (SEQ ID NO: 22), CNKRYFKLLSHLQMHSRKH (SEQ ID NO: 23) and CNKRYFKLLSHLQMHSRRKHTG (SEQ ID NO: 24) Peptides having any amino acid sequence selected
- cancer antigen peptide C When R 1 is cancer antigen peptide C, the thioether group of the cysteine residue of cancer antigen peptide C is bonded to the thioether group in formula (1).
- Cancer antigen peptide C is an MHC class I-restricted WT1 peptide consisting of 7 to 30 amino acids including one cysteine residue or an MHC class II constraint consisting of 7 to 30 amino acids including one cysteine residue Represents the sex WT1 peptide.
- the amino acid sequence of the peptide contains at least one cysteine residue.
- the number of cysteine residues contained is preferably 1 to 3, more preferably 1 to 2, and most preferably 1.
- the “MHC class I-restricted WT1 peptide” has the same meaning as described above.
- the compound of the formula (1) in which R 1 is “MHC class I-restricted WT1 peptide consisting of 7 to 30 amino acids including one cysteine residue” is also not a homodimer but a heterodimer.
- MHC class I-restricted WT1 peptide comprising 7 to 30 amino acids including one cysteine residue include the peptides listed in Tables 45 to 52. In each table, “position” indicates the position in the amino acid sequence of human WT1 described in SEQ ID NO: 1.
- the following amino acid sequence is more preferable: CMTWNQMNL (SEQ ID NO: 3) Or a peptide containing a modified amino acid sequence containing a modified amino acid residue in the amino acid sequence of SEQ ID NO: 3 and having CTL-inducing activity.
- the “including the amino acid sequence” and the “peptide containing a modified amino acid sequence containing an amino acid residue modification in the amino acid sequence and having CTL-inducing activity” are as defined above.
- the following amino acid sequence CMTWNQMNL (SEQ ID NO: 3) and CYTWNQMNL (SEQ ID NO: 4) Peptides having any amino acid sequence selected from
- R 1 is “MHC class I-restricted WT1 peptide comprising 7 to 30 amino acids including one cysteine residue”, preferably the compound of formula (4):
- cancer antigen peptide C which is an MHC class I-restricted WT1 peptide
- the thioether group of the cysteine residue of the peptide bound to the N terminus of the cancer antigen peptide C is represented by the formula (16):
- bonded with the thioether group of the cysteine residue of cancer antigen peptide E may be sufficient.
- X d ”, “Y d ”, “cancer antigen peptide D” and “cancer antigen peptide E” are the above-mentioned “X d ”, “Y d ”, “cancer antigen peptide D” and “cancer antigen peptide”. It is synonymous with the definition in “Peptide E”.
- the “peptide consisting of 1 to 4 amino acids including one cysteine residue” bonded to the N-terminus of “cancer antigen peptide C” which is an MHC class I-restricted WT1 peptide is preferably , A dipeptide consisting of CA.
- a peptide consisting of 1 to 4 amino acids including one cysteine residue is further bound to the N-terminus of “cancer antigen peptide C” which is an MHC class I-restricted WT1 peptide.
- the compound in which the thioether group of the cysteine residue of the peptide bonded to the N-terminus of the cancer antigen peptide C is bonded to the thioether group in the formula (16) is preferably the formula (14):
- a peptide consisting of 1 to 4 amino acids including one cysteine residue at the N-terminus of “cancer antigen peptide C” which is an MHC class I-restricted WT1 peptide is further bound.
- the thioether group of the cysteine residue of the peptide bonded to the N-terminus of the cancer antigen peptide C is bonded to the thioether group in the “cancer antigen peptide E”, preferably the compound of the formula (12 ):
- the “MHC class II-restricted WT1 peptide consisting of 7 to 30 amino acids including one cysteine residue” of the present invention it is sufficient that at least one cysteine residue is included in the amino acid sequence of the peptide.
- the number of cysteine residues contained is preferably 1 to 3, more preferably 1 to 2, and most preferably 1.
- MHC class II-restricted means the property of inducing helper T cells by binding to MHC class II molecules.
- HLA corresponding to MHC class II molecules is classified into subtypes such as HLA-DR, DQ and DP.
- the “MHC class II restriction” preferably includes HLA-DR restriction, HLA-DQ restriction or HLA-DP restriction.
- the “MHC class II-restricted WT1 peptide” in the present invention means a peptide that binds to an MHC class II antigen and induces helper T cells in vitro and / or in vivo.
- the number of amino acid residues of the “MHC class II-restricted WT1 peptide” is 7-30, preferably 14-30.
- MHC class II-restricted WT1 peptides consisting of 7 to 30 amino acids including one cysteine residue include, for example, the peptides listed in Table 53. In each table, “position” indicates the position in the amino acid sequence of human WT1 described in SEQ ID NO: 1.
- MHC class II-restricted WT1 peptide consisting of 7 to 30 amino acids including one cysteine residue
- SGQARMFPNAPNAPLPSCLES SEQ ID NO: 11
- PGCNKRYFKLSHHLQMHSRKHTG SEQ ID NO: 10
- a peptide comprising any amino acid sequence selected from among the above, or a modified amino acid sequence containing a modified amino acid residue in any amino acid sequence selected from SEQ ID NOs: 10 to 11, and a helper T cell Peptides having inducing activity can be mentioned.
- the “peptide containing an amino acid sequence” means a peptide in which an additional amino acid is added to the N-terminal amino acid and / or C-terminal amino acid of the amino acid sequence as described above.
- MHC class II-restricted WT1 peptide containing one cysteine residue when added, it may be added to the N-terminal side and / or the C-terminal side.
- the “peptide containing a modified amino acid sequence containing an amino acid residue modification in the amino acid sequence and having a helper T cell inducing activity” is also referred to as a “modified helper peptide”.
- the modified helper peptide means a peptide that consists of an amino acid sequence in which 1 to 3 amino acids are deleted, substituted and / or added in the amino acid sequence, binds to MHC class II, and induces helper T cells. .
- the number of amino acids to be added (including insertion) is preferably 1 to 3.
- the number of amino acids to be deleted is preferably 1-5.
- the added amino acid or the substituted amino acid may be an unnatural amino acid other than the 20 kinds of amino acids encoded by the gene.
- modified helper peptide examples include the following peptides.
- SGQAYMFPNAPYLPSCLES SEQ ID NO: 12 which is a modified helper peptide of SGQARMFPNAPYLPSCLES (SEQ ID NO: 11) (see Patent Document 6), SGQARMFPNAPYLPSC (SEQ ID NO: 19) or SGQAYMFPNAPYLPSC (SEQ ID NO: 25); or
- PGCNKRYFKLLSHLQMHSRK (SEQ ID NO: 20), which is a modified helper peptide of PGCNKRYFKLSHHLQMHSRKHTG (SEQ ID NO: 10), PGCNKRYFKLSHHLQMHSRKH (SEQ ID NO: 21), CNKRYFKLLSHLQMHSRK (SEQ ID NO: 22), CNKRYFKLLSHLQMHSRKH (SEQ ID NO: 23) or CNKRYFKLLSHLQMHSRRKHTG (SEQ ID NO: 24).
- MHC class II-restricted WT1 peptide consisting of 7 to 30 amino acids including one cysteine residue more preferably, the following amino acid sequence: SGQARMFPNAPYLPSC (SEQ ID NO: 19), SGQAYMFPNAPYLPSC (SEQ ID NO: 25), SGQARMFPNAPYLPSCLES (SEQ ID NO: 11), SGQAYMFPNAPYLPSCLES (SEQ ID NO: 12), PGCNKRYFKLLSHLQMHSRK (SEQ ID NO: 20), PGCNKRYFKLSHHLQMHSRKH (SEQ ID NO: 21), PGCNKRYFKLLSHLQMHSRHKTG (SEQ ID NO: 10), CNKRYFKLLSHLQMHSRK (SEQ ID NO: 22), CNKRYFKLLSHLQMHSRKH (SEQ ID NO: 23) and CNKRYFKLLSHLQMHSRRKHTG (SEQ ID NO: 24) Peptides having any amino acid sequence
- R 1 is “MHC class II-restricted WT1 peptide consisting of 7 to 30 amino acids including one cysteine residue”, preferably the compound of formula (6):
- the present invention also provides a composition comprising a compound of the present invention and one or more MHC class II restricted WT1 peptides.
- Examples of the MHC class II-restricted WT1 peptide contained in the composition of the present invention include the following amino acid sequences: CNKRYFKLLSHLQMHSRK (SEQ ID NO: 22), CNKRYFKLLSHLQMHSRKH (SEQ ID NO: 23), CNKRYFKLLSHLQMHSRKHTG (SEQ ID NO: 24), WAPVLDFAPPGASAYGSL (SEQ ID NO: 244), CWAPVLDFAPPGASAYGSL (SEQ ID NO: 242) and WAPVLDFAPPGASAYGSLC (SEQ ID NO: 243) Is mentioned.
- the invention also provides for two different MHC class I-restricted WT1 peptides and MHC class II-restricted WT1 peptides, or two different MHC class I-restricted WT1 epitopes and MHC class II-restricted WT1 epitopes, respectively, via disulfide bonds.
- Methods for synthesizing conjugated compounds are provided.
- the method of the present invention includes the following steps (1) to (3).
- step (1) of the present invention using Fmoc-C (Mmt) A-SBn and cancer antigen peptide C, the carbonyl group of the C-terminal amino acid of C (Mmt) A and the N-terminal amino group of cancer antigen peptide C Is synthesized.
- “Cancer antigen peptide C” has the same definition as “cancer antigen peptide C”.
- “Fmoc” represents a 9-fluorenylmethoxycarbonyl group.
- “Mmt” represents a monomethoxytrityl group.
- SBn represents a thiobenzyl group.
- the peptide obtained in the step (1) and the cancer antigen peptide A in which one cysteine residue protected with an Npys group is bonded to the N-terminus are used.
- a peptide in which the thioether group of the cysteine residue of the cancer antigen peptide C in the peptide obtained in (1) and the thioether group of the cysteine residue bonded to the N-terminus of the cancer antigen peptide A are synthesized.
- Cancer antigen peptide A has the same definition as “cancer antigen peptide A”.
- “Npys” represents a 3-nitro-2-pyridylthio group.
- the peptide obtained in the step (2) using the peptide obtained in the step (2) and the cancer antigen peptide D containing a cysteine residue protected with an SPy group.
- a peptide in which the thioether group of the cysteine residue bonded to the N-terminal of the cancer antigen peptide A in the middle and the thioether group of the cysteine residue of the cancer antigen peptide D are combined is synthesized.
- Carcer antigen peptide D has the same definition as “cancer antigen peptide D”.
- SPy represents a 2-pyridyl sulfide group.
- the compounds and peptides of the present invention and peptides corresponding to intermediates thereof can be produced according to the methods described in the examples of the present specification or the methods used in usual peptide synthesis.
- literature Peptide Synthesis, Interscience, New York, 1966; The Proteins, Vol 2, Academic Press Inc., New York, 1976; Peptide Synthesis, Maruzen (1976) ), 1975; peptide synthesis basics and experiments, Maruzen Co., Ltd., 1985; Development of pharmaceuticals, Vol. 14, Peptide synthesis, Hirokawa Shoten, 1991).
- a method of producing by a solid phase synthesizer using the Fmoc method or Boc method and a method of producing by sequentially condensing Boc-amino acid or Z-amino acid by a liquid phase synthesis method
- Fmoc is 9-fluorene
- Nylmethoxycarbonyl group, Boc represents t-butoxycarbonyl group
- Z represents benzyloxycarbonyl group
- functional groups such as amino group, carboxy group, mercapto group and the like are protected with an appropriate protecting group using a protection or deprotection technique as necessary. Can be protected.
- protecting groups include an acetamidomethyl group or a trityl group.
- the disulfide bond between two different peptides containing a cysteine residue or between a peptide containing a cysteine residue and a cysteine can be formed.
- Methods for forming disulfide bonds are described in the literature (Peptide Synthesis, Interscience, New York, 1966; The Proteins, Vol 2, Academic Press, Inc., New York, 1976; Peptide Synthesis; (Inc.), 1975; Basics and experiments of peptide synthesis, Maruzen Co., Ltd., 1985; Pharmaceutical Development, Vol. 14, Peptide Synthesis, Hirokawa Shoten, 1991).
- disulfide when a peptide has one cysteine residue, disulfide is obtained by removing all protecting groups including a mercapto group protecting group on the cysteine side chain and then oxidizing in an inert solvent.
- a compound having a bond (disulfide compound) can be produced.
- it can manufacture by mixing two intermediates which have a mercapto group in a suitable solvent, and oxidizing.
- oxidation method a known method for forming a disulfide bond by ordinary peptide synthesis may be appropriately selected.
- iodine oxidation a method of subjecting to an air oxidation reaction under alkaline conditions, or a method of forming a disulfide bond by adding an oxidizing agent under alkaline or acidic conditions.
- the oxidizing agent include iodine, dimethyl sulfoxide (DMSO), potassium ferricyanide and the like.
- DMSO dimethyl sulfoxide
- the solvent water, acetic acid, methanol, chloroform, DMF or DMSO, or a mixture thereof can be used. Oxidation reactions often give a mixture of symmetrical, asymmetrical disulfide compounds.
- the target asymmetric disulfide compound can be obtained by purification by various chromatography or recrystallization.
- a selective disulfide bond can be formed by mixing an intermediate having an activated mercapto group and an intermediate having a mercapto group.
- the intermediate having an activated mercapto group include a mercapto group to which an Npys group (3-nitro-2-pyridinesulfenyl group) is bonded.
- a selective disulfide bond is formed by adding the other intermediate after activating the mercapto group in advance by mixing one intermediate with, for example, 2,2′-dithiobis (5-nitropyridine). (Tetrahedron Letters. Vol. 37. No. 9, pp. 1347-1350).
- a dimer in which a disulfide bond is formed between the target cysteine residues can be obtained by combining the protecting groups of the cysteine side chains in a specific combination.
- Combinations of the protecting groups include MeBzl (methylbenzyl) group and Acm (acetamidomethyl) group, Trt (trityl) group and Acm group, Npys (3-nitro-2-pyridylthio) group and Acm group, S-Bu- and t (S-tert-butyl) group and Acm group.
- the obtained compounds, peptides and intermediates of the present invention can be purified according to methods known to those skilled in the art and methods used in ordinary peptide chemistry. For example, it can be purified by various chromatography (for example, silica gel column chromatography, ion exchange column chromatography, gel filtration, or reverse phase chromatography) or recrystallization.
- chromatography for example, silica gel column chromatography, ion exchange column chromatography, gel filtration, or reverse phase chromatography
- the recrystallization solvent includes alcohol solvents such as methanol, ethanol or 2-propanol, ether solvents such as diethyl ether, ester solvents such as ethyl acetate, aromatic hydrocarbon solvents such as benzene or toluene, acetone A ketone solvent such as hexane, a hydrocarbon solvent such as hexane, an aprotic solvent such as dimethylformamide or acetonitrile, water, or a mixed solvent thereof can be used.
- alcohol solvents such as methanol, ethanol or 2-propanol
- ether solvents such as diethyl ether
- ester solvents such as ethyl acetate
- aromatic hydrocarbon solvents such as benzene or toluene
- acetone A ketone solvent such as hexane
- a hydrocarbon solvent such as hexane
- an aprotic solvent such as dimethylformamide or acetonitrile
- the compound of the present invention has one or more asymmetric points, it can be produced by using a raw material (amino acid) having the asymmetric point according to a usual method.
- a raw material amino acid
- optical resolution or the like may be performed at an appropriate stage of the production process.
- the compound of the present invention or an intermediate thereof in an inert solvent for example, alcohol solvents such as methanol, ethanol or 2-propanol, ether solvents such as diethyl ether, ester solvents such as ethyl acetate) , Hydrocarbon solvents such as toluene, or aprotic solvents such as acetonitrile, and mixed solvents thereof), optically active acids (for example, monocarboxylic acids such as mandelic acid, N-benzyloxyalanine, or lactic acid, tartaric acid) , Dicarboxylic acid such as o-diisopropylidene tartaric acid or malic acid, or sulfonic acid such as camphor sulfonic acid or bromocamphor sulfonic acid), and the like.
- an inert solvent for example, alcohol solvents such as methanol, ethanol or 2-propanol, ether solvents such as diethyl ether, ester solvents such as
- a salt is formed with an optically active amine (for example, an organic amine such as ⁇ -phenethylamine, quinine, quinidine, cinchonidine, cinchonine, strychnine).
- an optically active amine for example, an organic amine such as ⁇ -phenethylamine, quinine, quinidine, cinchonidine, cinchonine, strychnine.
- the optical division can also be performed.
- the temperature for forming the salt is selected from the range from room temperature to the boiling point of the solvent. In order to improve the optical purity, it is desirable to raise the temperature once to near the boiling point of the solvent. When the precipitated salt is collected by filtration, the yield can be improved by cooling as necessary.
- the amount of the optically active acid or amine used is in the range of about 0.5 to about 2.0 equivalents, preferably in the range of about 1 equivalent, relative to the substrate. Crystals in an inert solvent as necessary (for example, alcohol solvents such as methanol, ethanol, 2-propanol, ether solvents such as diethyl ether, ester solvents such as ethyl acetate, hydrocarbon solvents such as toluene, acetonitrile, etc. And a high-purity optically active salt can be obtained. Further, if necessary, the optically resolved salt can be treated with an acid or base by a conventional method to obtain a free form.
- “pharmaceutically acceptable salts” include acid addition salts and base addition salts.
- the acid addition salts include inorganic acid salts such as hydrochloride, hydrobromide, sulfate, hydroiodide, nitrate and phosphate, citrate, oxalate, acetate, formate , Propionate, benzoate, trifluoroacetate, maleate, tartrate, methanesulfonate, benzenesulfonate, paratoluenesulfonate, and other organic acid salts.
- inorganic acid salts such as hydrochloride, hydrobromide, sulfate, hydroiodide, nitrate and phosphate, citrate, oxalate, acetate, formate , Propionate, benzoate, trifluoroacetate, maleate, tartrate, methanesulfonate, benzenesulfonate, paratoluenesulfonate, and
- Inorganic base salts such as sodium salt, potassium salt, calcium salt, magnesium salt, ammonium salt, organic base salts such as triethylammonium salt, triethanolammonium salt, pyridinium salt, diisopropylammonium salt, and the like, and arginine, Examples thereof include amino acid salts such as basic or acidic amino acids such as aspartic acid and glutamic acid.
- hydrates of the compounds of the present invention or pharmaceutically acceptable salts thereof are also included in the present invention.
- solvates such as ethanol solvates.
- the present invention also includes all diastereomers, all enantiomers and the like of the compound represented by the formula (1), and all forms of crystal forms.
- amino acid-deficient peptides were decomposed by hydrolysis, oxidation, etc. during the steps of condensing optically active ⁇ -amino acids, removing various protecting groups, or cleaving peptides from resins.
- Various by-products such as peptides and peptides racemized from amino acids are produced.
- these impurities can be removed to combine high purity peptides and compounds by combining various chromatographies (eg silica gel column chromatography, ion exchange column chromatography, gel filtration, or reverse phase chromatography). Obtainable. However, it is not easy to obtain highly pure peptides and compounds on an industrial scale to provide them as pharmaceuticals.
- the compound of the present invention also has the property that it can be mass-produced as an active pharmaceutical ingredient in its physicochemical properties. Specifically, it has properties such as high solubility, excellent stability in solution, or difficulty in gelation when concentrated, and is a large scale in the purification process by column chromatography such as reverse phase HPLC. Can be easily produced as a drug substance with high purity.
- the compound of the present invention thus produced has excellent stability against oxidizing agents in solution due to the cysteine residue forming a disulfide bond, and has a certain quality as a pharmaceutical raw material. It retains efficient CTL inducing activity.
- the compound of the present invention is useful as an active ingredient of a CTL inducer in cancer immunotherapy, as an active ingredient of a cancer vaccine, and as an active ingredient of a pharmaceutical composition. That is, the compound of the present invention has excellent immunogenicity and can efficiently exhibit excellent CTL-inducing activity as shown in the Examples of the present specification.
- the CTL induced by the compound of the present invention surprisingly can recognize the natural partial peptide of WT1 originally possessed by cancer cells.
- CTL inducing activity is determined by measuring the number of CTLs by the HLA tetramer method (Int. J. Cancer: 100, 565-570 (2002)) or the limiting dilution method (Nat. Med .: 4, 321-327 (1998)). This can be confirmed.
- HLA-A24-restricted CTL inducing activity WO 02/47474 and Int. J. et al. Cancer: 100, 565-570 (2002) can be examined by using the HLA-A24 model mouse described.
- the compound of the present invention can be used as a therapeutic agent or preventive agent (relapse prevention agent) for cancer in which WT1 gene is expressed or cancer accompanied by an increase in the expression level of WT1 gene.
- the cancer include blood cancer such as leukemia, myelodysplastic syndrome, multiple myeloma or malignant lymphoma, or gastric cancer, colon cancer, lung cancer, breast cancer, germ cell cancer, liver cancer, skin cancer, bladder cancer, prostate cancer. , Solid cancer such as uterine cancer, cervical cancer, ovarian cancer or brain tumor.
- the compound of the present invention or a pharmaceutically acceptable salt thereof is made into an appropriate form according to each compound or each salt, so that the active ingredient of the CTL inducer, the active ingredient of the cancer vaccine or the cancer vaccine / And can be an active ingredient of a pharmaceutical composition.
- a pharmaceutically acceptable carrier for example, an appropriate adjuvant.
- an appropriate adjuvant those described in the literature (Clin. Microbiol. Rev., 7: 277-289, 1994) and the like can be applied.
- bacterial cell-derived components GM-CSF, interleukin-2 , Cytokines such as interleukin-7 or interleukin-12, plant-derived components, marine organism-derived components, mineral gels such as aluminum hydroxide, surfactants such as lysolecithin and pluronic polyols, polyanions, peptides, or oil emulsions (Emulsion formulation).
- lipid A As the cell-derived component, lipid A (lipid A), its derivative monophosphoryl lipid A (monophosphoryl lipid A), bacteria (including Mycobacterium bacteria such as BCG bacteria), bacteria-derived proteins, Examples include polynucleotides, Freund's Incomplete Adjuvant, Freund's Complete Adjuvant, cell wall skeleton components (for example, BCG-CWS), trehalose dimycolate (TDM), etc. .
- the compound of the present invention can also be administered in the form of a liposome preparation, a particulate preparation bound to beads having a diameter of several ⁇ m, a preparation bound to lipid, and the like.
- the compounds (conjugates) of the invention can be administered with MHC class II restricted WT1 peptides (ie helper peptides).
- MHC class II restricted WT1 peptides ie helper peptides
- a cocktail preparation containing the conjugate and the helper peptide in one pharmaceutical composition.
- the cocktail formulation comprises a conjugate capable of producing an MHC class I restricted WT1 peptide (ie killer peptide) and an MHC class II restricted WT1 peptide (ie helper peptide).
- helper T cell activation of a helper T cell (helper T cell) that is important for enhancing the function of other T cells including CTLs can be achieved by administering this cocktail preparation containing a helper peptide as a cancer vaccine in cancer immunotherapy. It becomes possible, and the function and medicinal effect (cellular immunity etc.) of the conjugate can be improved.
- the MHC class II-restricted WT1 peptide ie, helper peptide
- the helper peptide of this cocktail preparation includes the following amino acid sequences: CNKRYFKLLSHLQMHSRK (SEQ ID NO: 22), CNKRYFKLLSHLQMHSRKH (SEQ ID NO: 23), CNKRYFKLLSHLQMHSRKHTG (SEQ ID NO: 24), WAPVLDFAPPGASAYGSL (SEQ ID NO: 244), CWAPVLDFAPPGASAYGSL (SEQ ID NO: 242) and WAPVLDFAPPGASAYGSLC (SEQ ID NO: 243) Is mentioned. Among them, WAPVLDFAPPGASAYGSL (SEQ ID NO: 244) is preferable. As shown in the examples and test examples of the present specification as an example, it was confirmed that this cocktail preparation had improved efficacy as a cancer vaccine such as cellular immunity.
- the dosage of the compound of the present invention in the preparation can be appropriately adjusted depending on the disease to be treated, the age, weight, etc. of the patient, but is usually 0.0001 mg to 1000 mg, preferably 0.001 mg to 1000 mg, more preferably. 0.1 mg to 10 mg.
- Examples of the administration method include intradermal administration, subcutaneous administration, intramuscular administration, intravenous administration, and transdermal administration. Intradermal administration and subcutaneous administration that efficiently induce CTL are preferred.
- the number of administrations and the administration interval can be appropriately adjusted depending on the disease for treatment or prevention and individual differences among patients, but it is usually a plurality of times and preferably administered once every several days to several months.
- Step 1 Synthesis of H-Cys (Npys) -Arg-Met-Phe-Pro-Asn-Ala-Pro-Tyr-Leu-OH (Synthesis of C (Npys) RMFPNAPYL) Fmoc-Leu-Alko-resin (Alko is p-alkoxybenzyl alcohol) 282 mg (manufactured by Watanabe Chemical; 0.71 mmol / g, 0.2 mmol) is used as a starting material to assemble peptide chains by solid phase synthesis by the Fmoc / tBu method. went.
- CS336X type peptide synthesizer manufactured by CS Bio was used, and the Fmoc group was deprotected by treating with 20% piperidine in DMF for 5 minutes and 20 minutes. Coupling of protected amino acids was performed by reacting with 1.05 mmol of protected amino acids, 1 mmol of HBTU, 2 mmol of DIPEA in DMF for 1 hour.
- the obtained resin was washed with DMF and ether and dried under reduced pressure to obtain Boc-Cys (Npys) -Arg (Pmc) -Met-Phe-Pro-Asn (Trt) -Ala-Pro-Tyr (tBu) -Leu -630 mg of Alko-resin was obtained.
- 10 ml of a mixed solution of TFA / H 2 O / TIS 95 / 2.5 / 2.5 was added and shaken at room temperature for 2 hours. After removing the resin by filtration, the reaction solution was concentrated under reduced pressure. The reaction solution was ice-cooled and 50 ml of diethyl ether was added.
- the resulting precipitate was collected by filtration, washed with ether, and then dried under reduced pressure to obtain 217 mg of a crude peptide.
- the obtained crude peptide solution was dissolved in a mixed solution of 20 ml of 20% aqueous acetic acid and 1 ml of acetonitrile and purified by reverse phase HPLC.
- the reaction solution was diluted with 5 ml of 0.1% TFA water and purified by reverse phase HPLC. Pump: manufactured by Shimadzu; LC-8A type column: YMC ODS-A 3 cm ⁇ ⁇ 25 cmL, 10 ⁇ m Eluent 1: H 2 O / 0.1% TFA Eluent 2: CH 3 CN / 0.1% TFA Flow rate: 20 ml / min Detection: UV220nm
- the reaction solution was injected into a column equilibrated at a two-component concentration of 25%. Thereafter, the concentration of the two liquids was increased at a rate of 0.25% per minute.
- Step 1 Solid phase synthesis similar to the method described in Example 1, starting from 338 mg of Fmoc-Leu-Alko-resin (Alko is p-alkoxybenzyl alcohol) (Watanabe Chemical; 0.74 mmol / g, 0.25 mmol) Was performed twice to obtain 1.54 g of H-Cys (Trt) -Arg (Pmc) -Met-Phe-Pro-Asn (Trt) -Ala-Pro-Tyr (tBu) -Leu-Alko-resin.
- Alko is p-alkoxybenzyl alcohol
- HPLC manufactured by Shimadzu; LC6AD type
- Examples 3-5 In the same manner as in Example 2, a peptide consisting of the amino acid sequence of SEQ ID NO: 16, 18 or 17 was synthesized. Table 54 shows the amount of synthesis and the results of mass spectrometry.
- Test example 1 Time-dependent change of trimming of N-terminal amino acid by ERAP1 For each peptide of SEQ ID NOs: 13, 16, 18 and 17 synthesized in Examples 2 to 5, ERAP1 (PLoS One November 2008, vol. 3, Issue 11, e3658) The N-terminal amino acid trimming by was evaluated. 30 ⁇ l ERAP1 (2.0 mg / ml) PBS buffer solution was added to 258 ⁇ l Tris ⁇ HCl buffer. 12.0 ⁇ l of a 10 mM DMSO solution of each peptide was added to the above ERAP1 solution, mixed well, and allowed to stand at room temperature.
- Table 56 and FIG. 1 show the changes over time in the peptide production rate obtained by trimming.
- ERAP-1 selectively cleaves the extended N-terminal Cys in any Cys extended peptide (SEQ ID NOs: 13, 16, 17 and 18). It is strongly suggested that it undergoes appropriate trimming by ERAP-1 and is finally converted to the target cancer antigen peptide (SEQ ID NOs: 2, 5, 6 and 7) without being largely dependent on the sequence.
- Test example 2 Evaluation of CTL inducibility in vivo using HLA-A0201 transgenic mice and HLA-A2402 transgenic mice
- the compound represented by the formula is a compound in which the cancer antigen peptide A is RMFPNAPYL (SEQ ID NO: 2) and the cancer antigen peptide B is CYTWNQMNL (SEQ ID NO: 4).
- RMFPNAPYL (SEQ ID NO: 2) is an HLA-A0201 restricted WT1 peptide
- CYTWNQMNL is an HLA-A24 restricted epitope WT1 peptide.
- HLA-A0201 transgenic mice C57BL / 6CrHLA-A2.1DR1
- HLA-DRB1 * 0101 of the H-2D b is HLA-A0201
- the mouse MHC is a human MHC
- HLA-A2402 transgenic mice (C57BL / 6CrHLA-A2402 / K b) is a mice expressing chimeric HLA of H-2K b is HLA-A2402 and the mouse MHC is a human MHC, the present mouse By using it, it is possible to select peptides capable of inducing CTL in HLA-A24 positive humans (Int J Cancer. 2002; 100: 565-70).
- CTL against the target peptide (SEQ ID NO: 2, 4) is induced by administration of the compound represented by the formula (5) is derived from the above-mentioned mouse administered with the compound represented by the formula (5) It was judged by measuring whether spleen cells of IFN ⁇ were produced when restimulation was performed with a peptide (SEQ ID NO: 2, 4).
- the compound represented by the formula (5) is dissolved in dimethyl sulfoxide (DMSO) to 40 mg / mL, further diluted to 5 mg / mL with water for injection, and then the equivalent amount of incomplete Freund's adjuvant (IFA) And emulsified.
- DMSO dimethyl sulfoxide
- IFA incomplete Freund's adjuvant
- the emulsified compound was administered into the ridge skin of the mouse at 4 sites at 250 ⁇ g / site.
- the mouse was euthanized with CO 2 gas, and then the spleen was removed and spleen cells were prepared.
- An IFN ⁇ ELISPOT assay kit was used to measure IFN ⁇ production.
- the ELISPOT plate was treated with anti-mouse IFN ⁇ antibody and blocked on RPMI 1640 medium containing 10% FBS on the day.
- the prepared spleen cells derived from HLA-A0201 transgenic mice were seeded at 0.15 ⁇ 10 6 cells / well and spleen cells derived from HLA-A2402 transgenic mice were plated at 1 ⁇ 10 6 cells / well on a blocked ELISPOT plate. did.
- the peptide (SEQ ID NO: 2, 4) was dissolved in DMSO to 40 mg / mL, and further diluted to 40 ⁇ g / mL in RPMI 1640 medium containing 10% FBS.
- the diluted peptide (SEQ ID NO: 2) was added to splenocytes derived from HLA-A0201 transgenic mice at a final concentration of 10 ⁇ g / mL.
- the diluted peptide (SEQ ID NO: 4) was added to splenocytes derived from HLA-A2402 transgenic mice at a final concentration of 10 ⁇ g / mL.
- In vitro peptide re-stimulation was applied by culturing the splenocytes to which the peptide had been added for 20 hours at 37 ° C. under 5% CO 2 . After incubation, the supernatant was removed and the ELISPOT plate was developed according to the attached protocol. The number of spots developed was measured by an ImmunoSpot Analyzer (manufactured by C.T.L.).
- the results of IFN ⁇ ELISPOT assay using HLA-A0201 transgenic mice are shown in FIG. 2, and the results of IFN ⁇ ELISPOT assay using HLA-A2402 transgenic mice are shown in FIG.
- the vertical axis indicates the number of cells that reacted in the number of seeded cells.
- the black and white bars in FIG. 2 show the results of culturing splenocytes derived from HLA-A0201 transgenic mice in the presence and absence of the peptide of interest represented by SEQ ID NO: 2
- the white bars show the results of culturing spleen cells derived from HLA-A2402 transgenic mice in the presence and absence of the peptide of interest represented by SEQ ID NO: 4.
- the difference between the values of the black bar and the white bar indicates the number of each peptide-specific CTL of interest induced in the mouse body by administration of the compound represented by formula (5).
- the value of the white bar is not recognized in each figure. This indicates that the splenocytes of each transgenic mouse did not react at all in the absence of the target peptide.
- the target peptide-specific IFN ⁇ production represented by SEQ ID NO: 2 was found in splenocytes derived from HLA-A0201 transgenic mice, and SEQ ID NO: in splenocytes derived from HLA-A2402 transgenic mice.
- the target peptide-specific IFN ⁇ production represented by 4 was confirmed.
- the compound represented by the formula (5) can induce the peptide-specific CTL represented by SEQ ID NO: 2 and the peptide-specific CTL represented by SEQ ID NO: 4. .
- the compound represented by the formula (5) is actually produced into peptides of SEQ ID NO: 2 and SEQ ID NO: 4 after undergoing disulfide bond cleavage and appropriate trimming by ERAP-1 in the mouse body. It was strongly suggested. That is, the compound represented by formula (5), which is an example of the compound of the present invention, is a conjugate in which two different WT1 peptides are complexed via a disulfide bond as shown in formula (1). It was revealed that this is a WT1 cancer antigen peptide conjugate vaccine that can actually induce two different CTLs in vivo.
- HPLC measurement condition column ChemcoPack Quicksorb (4.6 mm ⁇ ⁇ 150 mm, 5 ⁇ m) Mobile phase manufactured by Chemco Corporation: A solution; 0.1% TFA water, B solution; 0.1% TFA acetonitrile solution Column temperature: room temperature Flow rate: 1mL / min Detection wavelength: UV 254nm, 230nm (2 wavelength detection) Sample injection volume: 10 ⁇ L
- Test example 4 Evaluation of CTL inducibility in vivo using HLA-A0201 transgenic mice
- the bond between C and C represents a disulfide bond.
- the compound represented by the formula is particularly a compound in which the cancer antigen peptide A is RMFPNAPYL (SEQ ID NO: 2) and the cancer antigen peptide B is SLGEQQYSV (SEQ ID NO: 6).
- RMFPNAPYL (SEQ ID NO: 2) and SLGEQQYSV (SEQ ID NO: 6) are HLA-A0201 restricted WT1 peptides.
- the HLA-A0201 transgenic mouse is as described in Test Example 2.
- CTL against the target peptide (SEQ ID NOs: 2 and 6) is induced by administration of the compound represented by the formula (3) is derived from the above mouse administered with the compound represented by the formula (3) It was determined by measuring whether spleen cells of IFN ⁇ were produced when restimulation was performed with a peptide (SEQ ID NO: 2, 6).
- the compound represented by formula (3) was dissolved in water for injection to 10 mg / mL, and then mixed with an equal amount of incomplete Freund's adjuvant (IFA) to form an emulsion.
- IFA incomplete Freund's adjuvant
- the emulsified compound was administered into the ridge skin of the mouse at two sites at 500 ⁇ g / site.
- the mouse was euthanized with CO 2 gas, and then the spleen was removed and spleen cells were prepared.
- An IFN ⁇ ELISPOT assay kit was used to measure IFN ⁇ production.
- the ELISPOT plate was treated with anti-mouse IFN ⁇ antibody and blocked on RPMI 1640 medium containing 10% FBS on the day.
- the prepared HLA-A0201 transgenic mouse-derived splenocytes were seeded on a blocked ELISPOT plate at 0.75 ⁇ 10 6 cells / well.
- the peptide (SEQ ID NO: 2, 6) was dissolved in DMSO to 40 mg / mL, and further diluted to 40 ⁇ g / mL in RPMI 1640 medium containing 10% FBS. Diluted peptide (SEQ ID NO: 2, 6) was added to splenocytes from HLA-A0201 transgenic mice at a final concentration of 10 ⁇ g / mL.
- In vitro peptide re-stimulation was applied by culturing the splenocytes to which the peptide had been added for 20 hours at 37 ° C. under 5% CO 2 . After incubation, the supernatant was removed and the ELISPOT plate was developed according to the attached protocol. The number of spots developed was measured by an ImmunoSpot Analyzer (manufactured by C.T.L.).
- FIG. 4 The results of IFN ⁇ ELISPOT assay using HLA-A0201 transgenic mice are shown in FIG.
- the vertical axis shows the number of cells that reacted in the number of seeded cells.
- the black bars and hatched bars in FIG. 4 show the results of culturing splenocytes derived from HLA-A0201 transgenic mice while pulsing each peptide represented by SEQ ID NOs: 2 and 6, and the white bars are cultured without pulses. Results are shown. That is, the difference between the values of black bars or diagonal bars and white bars indicates the number of peptide-specific CTLs, which are represented by SEQ ID NOs: 2 and 6 in the mouse body by administration of the compound represented by formula (3).
- the compound represented by the formula (3) can induce each peptide-specific CTL represented by SEQ ID NOs: 2 and 6.
- the compound represented by the formula (3) is actually produced into the peptides represented by SEQ ID NOs: 2 and 6 after undergoing disulfide bond cleavage and appropriate trimming by ERAP-1 in vivo in mice. It was strongly suggested. That is, the compound represented by the formula (3), which is an example of the compound of the present invention, is a conjugate in which two different peptides are complexed via a disulfide bond as shown in the formula (1). It was revealed that this is a WT1 cancer antigen peptide conjugate vaccine that can actually induce two different CTLs in vivo.
- the compound represented by the formula is particularly a compound in which the cancer antigen peptide A is RMFPNAPYL (SEQ ID NO: 2) and the cancer antigen peptide C is CNKRYFKLSHHLQMHSRKHTG (SEQ ID NO: 24).
- RMFPNAPYL SEQ ID NO: 2 is an HLA-A0201 restricted WT1 peptide and CNKRYFKLLSHLQMHSRRKTG (SEQ ID NO: 24) is an MHC class II restricted WT1 peptide (ie, helper peptide).
- the HLA-A0201 transgenic mouse is as described in Test Example 2. By using this mouse, it is possible to select a peptide capable of inducing CTL in HLA-A02 positive humans, and in addition, a helper peptide capable of inducing helper T cells by binding to human HLA-DRB1 * 0101 It is also possible to evaluate the effect of enhancing CTL induction.
- the peptide represented by SEQ ID NO: 2 was dissolved in water for injection to 6 mg / mL, and then mixed with an equal amount of incomplete Freund's adjuvant (IFA) to form an emulsion.
- the emulsified peptide was administered at two sites at 150 ⁇ g / site in the ridge skin of mice.
- the compound represented by formula (6) was dissolved in water for injection to 19.8 mg / mL, and then mixed with an equal amount of incomplete Freund's adjuvant (IFA) to form an emulsion.
- the emulsified compound was administered at 495 ⁇ g / site in two places in the ridge skin of mice.
- the amount was adjusted to be equal to the amount of substance.
- the mouse was euthanized with CO 2 gas, and then the spleen was removed and spleen cells were prepared.
- An IFN ⁇ ELISPOT assay kit was used to measure IFN ⁇ production. On the day before splenocyte preparation, the ELISPOT plate was treated with anti-mouse IFN ⁇ antibody and blocked on RPMI 1640 medium containing 10% FBS on the day.
- the prepared HLA-A0201 transgenic mouse-derived spleen cells were seeded on a blocked ELISPOT plate at 0.25 ⁇ 10 6 cells / well or 0.5 ⁇ 10 6 cells / well.
- the peptide (SEQ ID NO: 2, 24) was dissolved in DMSO to 40 mg / mL, and further diluted to 40 ⁇ g / mL in RPMI 1640 medium containing 10% FBS. Diluted peptide (SEQ ID NO: 2, 24) was added to splenocytes derived from HLA-A0201 transgenic mice at a final concentration of 10 ⁇ g / mL.
- In vitro peptide re-stimulation was applied by culturing the splenocytes to which the peptide had been added for 20 hours at 37 ° C. under 5% CO 2 . After incubation, the supernatant was removed and the ELISPOT plate was developed according to the attached protocol. The number of spots developed was measured by an ImmunoSpot Analyzer (manufactured by C.T.L.).
- FIGS. 5 and 6 The results of IFN ⁇ ELISPOT assay using HLA-A0201 transgenic mice are shown in FIGS. 5 and 6, the vertical axis represents the number of cells that reacted in the number of seeded cells, and the horizontal axis represents the compound or peptide administered to the mouse.
- the black bars in FIG. 5 show the results of culturing splenocytes derived from HLA-A0201 transgenic mice while pulsing the peptide represented by SEQ ID NO: 2, and the white bars show the results of non-pulse culture.
- the difference between the value of the black bar and the white bar indicates the number of peptide-specific CTLs
- the administration of the peptide represented by SEQ ID NO: 2 or the compound represented by formula (6) in the mouse in vivo 2 shows that CTL specific to the peptide represented by 2 was induced.
- the value of the white bar is not recognized. This indicates that the spleen cells of HLA-A0201 transgenic mice did not react at all when the peptide of interest was not pulsed.
- production of IFN ⁇ specific for the peptide represented by SEQ ID NO: 2 was confirmed in spleen cells derived from HLA-A0201 transgenic mice.
- the number of IFN ⁇ -producing cells specific for the peptide represented by SEQ ID NO: 2 induced by administration of the compound represented by formula (6) in FIG. More than the number of peptide-specific IFN ⁇ producing cells induced by administration.
- the black bars in FIG. 6 show the results of culturing spleen cells derived from HLA-A0201 transgenic mice while pulsing the peptide represented by SEQ ID NO: 24, and the white bars show the results of non-pulse culture.
- the difference between the values of the black bar and the white bar indicates the number of peptide-reactive cells, and the helper peptide-reactive property represented by SEQ ID NO: 24 is expressed in the mouse in vivo by administration of the compound represented by formula (6).
- the value of the white bar is not recognized. This indicates that the spleen cells of HLA-A0201 transgenic mice did not react at all when the peptide of interest was not pulsed.
- the compound represented by the formula (6) can induce cells reactive to the CTL specific to the peptide represented by SEQ ID NO: 2 and the helper peptide represented by SEQ ID NO: 24. It became clear.
- the compound represented by formula (6) is actually produced into the peptides represented by SEQ ID NOs: 2 and 24 after undergoing disulfide bond cleavage and appropriate trimming by ERAP-1 in vivo in mice. It was strongly suggested.
- a cell reactive with the helper peptide represented by SEQ ID NO: 24 generated from the compound represented by formula (6) was induced, and thus a CTL specific for the peptide represented by SEQ ID NO: 2 was induced.
- the compound represented by the formula (6) which is an example of the compound of the present invention, is a conjugate in which two different peptides are complexed via a disulfide bond as shown in the formula (1). It has become apparent that this is actually a WT1 cancer antigen peptide conjugate vaccine that can induce CTL and helper peptide reactive cells in vivo.
- the compound represented by formula (I) is particularly a compound in which the cancer antigen peptide A is RMFPNAPYL (SEQ ID NO: 2) and the cancer antigen peptide C is CNKRYFKLSHHLQMHSRK (SEQ ID NO: 22).
- RMFPNAPYL SEQ ID NO: 2 is an HLA-A0201 restricted WT1 peptide
- CNKRYFKLSHLQMHSRK SEQ ID NO: 22
- MHC class II restricted WT1 peptide ie, helper peptide.
- HLA-A0201 transgenic mice are as described in Test Examples 2 and 5.
- Whether or not the administration of the compound represented by the formula (8) induces CTL and helper peptide (SEQ ID NO: 22) reactive cells against the target peptide (SEQ ID NO: 2) is expressed by the formula (8). It was determined by measuring whether or not IFN ⁇ was produced when restimulation of the mouse-derived spleen cells administered with the compound represented by the formula (SEQ ID NOs: 2, 22) was performed. In addition, a spleen cell derived from the mouse administered with the compound represented by formula (8) and a spleen cell derived from the mouse administered with the compound represented by SEQ ID NO: 2 were combined with a peptide (SEQ ID NO: 2). The number of IFN ⁇ producing cells when restimulation was performed was compared.
- the peptide represented by SEQ ID NO: 2 was dissolved in water for injection to 6 mg / mL, and then mixed with an equal amount of incomplete Freund's adjuvant (IFA) to form an emulsion.
- the emulsified peptide was administered at two sites at 150 ⁇ g / site in the ridge skin of mice.
- the compound represented by formula (8) was dissolved in water for injection to 18 mg / mL, and then mixed with an equal amount of incomplete Freund's adjuvant (IFA) to make an emulsion.
- the emulsified compound was administered into the ridge skin of the mouse at two sites at 450 ⁇ g / site.
- the amount was adjusted to be equal to the amount of substance.
- the mouse was euthanized with CO 2 gas, and then the spleen was removed and spleen cells were prepared.
- An IFN ⁇ ELISPOT assay kit was used to measure IFN ⁇ production. On the day before splenocyte preparation, the ELISPOT plate was treated with anti-mouse IFN ⁇ antibody and blocked on RPMI 1640 medium containing 10% FBS on the day.
- the prepared HLA-A0201 transgenic mouse-derived spleen cells were seeded on a blocked ELISPOT plate at 0.25 ⁇ 10 6 cells / well or 0.5 ⁇ 10 6 cells / well.
- the peptide (SEQ ID NO: 2, 22) was dissolved in DMSO to 40 mg / mL, and further diluted to 40 ⁇ g / mL in RPMI 1640 medium containing 10% FBS.
- the diluted peptide (SEQ ID NO: 2, 22) was added to splenocytes derived from HLA-A0201 transgenic mice at a final concentration of 10 ⁇ g / mL.
- In vitro peptide re-stimulation was applied by culturing the splenocytes to which the peptide had been added for 20 hours at 37 ° C. under 5% CO 2 . After incubation, the supernatant was removed and the ELISPOT plate was developed according to the attached protocol. The number of spots developed was measured by an ImmunoSpot Analyzer (manufactured by C.T.L.).
- FIGS. 7 and 8 The results of IFN ⁇ ELISPOT assay using HLA-A0201 transgenic mice are shown in FIGS. 7 and 8, the vertical axis represents the number of cells that reacted in the number of seeded cells, and the horizontal axis represents the compound or peptide administered to the mouse.
- the black bars in FIG. 7 show the results of culturing spleen cells derived from HLA-A0201 transgenic mice while pulsing the peptide represented by SEQ ID NO: 2, and the white bars show the results of non-pulse culture.
- the difference between the value of the black bar and the white bar indicates the number of peptide-specific CTLs, and the administration of the peptide represented by SEQ ID NO: 2 or the compound represented by formula (8) in the mouse in vivo 2 shows that CTL specific to the peptide represented by 2 was induced.
- the value of the white bar is not recognized. This indicates that the spleen cells of HLA-A0201 transgenic mice did not react at all when the peptide of interest was not pulsed.
- production of IFN ⁇ specific for the peptide represented by SEQ ID NO: 2 was confirmed in spleen cells derived from HLA-A0201 transgenic mice.
- the number of IFN ⁇ -producing cells specific for the peptide represented by SEQ ID NO: 2 induced by administration of the compound represented by formula (8) in FIG. More than the number of peptide-specific IFN ⁇ producing cells induced by administration.
- the black bars in FIG. 8 show the results of culturing spleen cells derived from HLA-A0201 transgenic mice while pulsing the peptide represented by SEQ ID NO: 22, and the white bars show the results of non-pulse culture. That is, the difference between the value of the black bar and the white bar indicates the number of peptide-reactive cells.
- the compound represented by the formula (8) can induce cells reactive to the CTL specific to the peptide represented by SEQ ID NO: 2 and the helper peptide represented by SEQ ID NO: 22. It became clear.
- the compound represented by the formula (8) is actually produced into the peptides represented by SEQ ID NOs: 2 and 22 after undergoing disulfide bond cleavage and appropriate trimming by ERAP-1 in the mouse body. It was strongly suggested.
- a cell reactive to the helper peptide represented by SEQ ID NO: 22 generated from the compound represented by the formula (8) was induced, a CTL specific for the peptide represented by SEQ ID NO: 2 was induced.
- the compound represented by Formula (8) which is an example of the compound of the present invention, is a conjugate in which two different peptides are complexed via a disulfide bond as shown in Formula (1). It has become apparent that this is actually a WT1 cancer antigen peptide conjugate vaccine that can induce CTL and helper peptide reactive cells in vivo.
- Example 10 In the same manner as in Example 1, each compound (conjugate) represented by the formula (9) was synthesized. Table 61 shows the results of mass spectrometry. (In the formula, the bond between C and C represents a disulfide bond.)
- Reference examples 8-9 A peptide having the amino acid sequence of SEQ ID NOS: 238 to 239 was synthesized in the same manner as in Example 2.
- Table 62 shows the results of mass spectrometry. Since the peptides described in the table are not compounds of the present invention, they are described as reference examples.
- Process 1 2.4 mg of the conjugate (Formula No. (6)) was dissolved in 120 ⁇ L of water for injection and stored at room temperature under light shielding.
- Process 2 As a cocktail vaccine, 1.1 mg of the peptide represented by SEQ ID NO: 2 was dissolved in 180 ⁇ L of water for injection, and 123 ⁇ L of this was used to dissolve 1.3 mg of the peptide represented by SEQ ID NO: 24, Stored at room temperature in the dark.
- Process 3 After 2.5 ⁇ L of the solution obtained in Step 1 and Step 2 was diluted with 50 ⁇ L of water for injection, analysis by HPLC (analysis conditions are shown below) was performed, and the area value immediately after the start of storage was taken as 100%.
- the compound represented by formula (I) is particularly a compound in which the cancer antigen peptide A is RMFPNAPYL (SEQ ID NO: 2) and the cancer antigen peptide C is CNKRYFKLSHHLQMHSRKH (SEQ ID NO: 23).
- RMFPNAPYL SEQ ID NO: 2 is an HLA-A0201 restricted WT1 peptide
- CNKRYFKLSHHLQMHSRKH SEQ ID NO: 23
- MHC class II restricted WT1 peptide ie, helper peptide
- HLA-A0201 transgenic mice are as described in Test Examples 2 and 5.
- Whether or not the administration of the compound represented by the formula (7) induces CTL and helper peptide (SEQ ID NO: 23) reactive cells against the target peptide (SEQ ID NO: 2) is expressed by the formula (7). It was determined by measuring whether or not IFN ⁇ was produced when restimulation of the mouse-derived spleen cells administered with the compound represented by the formula (SEQ ID NO: 2, 23) was performed. In addition, a spleen cell derived from the mouse administered with the compound represented by the formula (7) and a spleen cell derived from the mouse administered the compound represented by SEQ ID NO: 2 were combined with a peptide (SEQ ID NO: 2). The number of IFN ⁇ producing cells when restimulation was performed was compared.
- the peptide represented by SEQ ID NO: 2 was dissolved in water for injection to 6 mg / mL, and then mixed with an equal amount of incomplete Freund's adjuvant (IFA) to form an emulsion.
- the emulsified peptide was administered at two sites at 150 ⁇ g / site in the ridge skin of mice.
- the compound represented by the formula (7) was dissolved in 19 mg / mL with water for injection, and then mixed with an equal amount of incomplete Freund's adjuvant (IFA) to form an emulsion.
- the emulsified compound was administered at 475 ⁇ g / site at two sites in the ridge skin of mice.
- the amount was adjusted to be equal to the amount of substance.
- the mouse was euthanized with CO 2 gas, and then the spleen was removed and spleen cells were prepared.
- An IFN ⁇ ELISPOT assay kit was used to measure IFN ⁇ production. On the day before splenocyte preparation, the ELISPOT plate was treated with anti-mouse IFN ⁇ antibody and blocked on RPMI 1640 medium containing 10% FBS on the day.
- the prepared HLA-A0201 transgenic mouse-derived spleen cells were seeded on a blocked ELISPOT plate at 0.25 ⁇ 10 6 cells / well or 0.5 ⁇ 10 6 cells / well.
- the peptide (SEQ ID NO: 2, 23) was dissolved in DMSO to 40 mg / mL, and further diluted to 40 ⁇ g / mL in RPMI 1640 medium containing 10% FBS. Diluted peptide (SEQ ID NO: 2, 23) was added to splenocytes derived from HLA-A0201 transgenic mice at a final concentration of 10 ⁇ g / mL.
- In vitro peptide re-stimulation was applied by culturing the splenocytes to which the peptide had been added for 17 hours at 37 ° C. under 5% CO 2 . After incubation, the supernatant was removed and the ELISPOT plate was developed according to the attached protocol. The number of spots developed was measured by an ImmunoSpot Analyzer (manufactured by C.T.L.).
- FIGS. 9 and 10 The results of IFN ⁇ ELISPOT assay using HLA-A0201 transgenic mice are shown in FIGS. 9 and 10, the vertical axis represents the number of cells that reacted in the number of seeded cells, and the horizontal axis represents the compound or peptide administered to the mouse.
- the black bars in FIG. 9 show the results of culturing spleen cells derived from HLA-A0201 transgenic mice while pulsing the peptide represented by SEQ ID NO: 2, and the white bars show the results of non-pulse culture.
- the difference between the value of the black bar and the white bar indicates the number of peptide-specific CTLs, and the administration of the peptide represented by SEQ ID NO: 2 or the compound represented by formula (7) in the mouse in vivo 2 shows that CTL specific to the peptide represented by 2 was induced.
- the value of the white bar is not recognized. This indicates that the spleen cells of HLA-A0201 transgenic mice did not react at all when the peptide of interest was not pulsed. As a result of this test, production of IFN ⁇ specific for the peptide represented by SEQ ID NO: 2 was confirmed in spleen cells derived from HLA-A0201 transgenic mice.
- the number of IFN ⁇ -producing cells specific for the peptide represented by SEQ ID NO: 2 induced by administration of the compound represented by formula (7) in FIG. More than the number of peptide-specific IFN ⁇ producing cells induced by administration.
- the black bars in FIG. 10 show the results of culturing spleen cells derived from HLA-A0201 transgenic mice while pulsing the peptide represented by SEQ ID NO: 23, and the white bars show the results of non-pulse culture. That is, the difference between the values of the black bar and the white bar indicates the number of peptide-reactive cells, and the helper peptide-reactive property represented by SEQ ID NO: 23 in the mouse body by administration of the compound represented by the formula (7).
- the compound represented by the formula (7) can induce cells reactive to the CTL specific to the peptide represented by SEQ ID NO: 2 and the helper peptide represented by SEQ ID NO: 23. It became clear. The compound represented by the formula (7) is actually produced into the peptides represented by SEQ ID NOs: 2 and 23 after undergoing disulfide bond cleavage and appropriate trimming by ERAP-1 in the mouse body. It was strongly suggested.
- the compound represented by the formula (7) which is an example of the compound of the present invention, is a conjugate in which two different peptides are complexed via a disulfide bond as shown in the formula (1). It has become apparent that this is actually a WT1 cancer antigen peptide conjugate vaccine that can induce CTL and helper peptide reactive cells in vivo.
- the compound represented by the formula (1) is a compound in which the cancer antigen peptide A is ALLPAVPSL (SEQ ID NO: 5) and the cancer antigen peptide C is CNKRYFKLSHHLQMHSRKHG (SEQ ID NO: 24).
- ALLPAVPSL (SEQ ID NO: 5) is an HLA-A0201 and HLA-A2402 restricted WT1 peptide
- CNKRYFKLSHHLQMHSRRKHG is an MHC class II restricted WT1 peptide (ie, helper peptide).
- HLA-A0201 transgenic mice are as described in Test Examples 2 and 5.
- the peptide represented by SEQ ID NO: 5 was dissolved in water for injection to 6 mg / mL, and then mixed with an equal amount of incomplete Freund's adjuvant (IFA) to form an emulsion.
- the emulsified peptide was administered at two sites at 150 ⁇ g / site in the ridge skin of mice.
- the compound represented by formula (9) was dissolved in water for injection to 23.6 mg / mL, and then mixed with an equal amount of incomplete Freund's adjuvant (IFA) to form an emulsion.
- the emulsified compound was administered into the ridge skin of mice at two sites at 590 ⁇ g / site.
- the amount was adjusted to be equal to the amount of substance.
- the mouse was euthanized with CO 2 gas, and then the spleen was removed and spleen cells were prepared.
- An IFN ⁇ ELISPOT assay kit was used to measure IFN ⁇ production. On the day before splenocyte preparation, the ELISPOT plate was treated with anti-mouse IFN ⁇ antibody and blocked on RPMI 1640 medium containing 10% FBS on the day.
- the prepared HLA-A0201 transgenic mouse-derived spleen cells were seeded on a blocked ELISPOT plate at 0.25 ⁇ 10 6 cells / well or 0.75 ⁇ 10 6 cells / well.
- the peptide (SEQ ID NO: 5, 24) was dissolved in DMSO at 40 mg / mL, and further diluted to 40 ⁇ g / mL in RPMI 1640 medium containing 10% FBS. Diluted peptide (SEQ ID NO: 5, 24) was added to splenocytes derived from HLA-A0201 transgenic mice at a final concentration of 10 ⁇ g / mL.
- In vitro peptide re-stimulation was applied by culturing the splenocytes to which the peptide had been added for 17 hours at 37 ° C. under 5% CO 2 . After incubation, the supernatant was removed and the ELISPOT plate was developed according to the attached protocol. The number of spots developed was measured by an ImmunoSpot Analyzer (manufactured by C.T.L.).
- FIGS. 11 and 12 The results of IFN ⁇ ELISPOT assay using HLA-A0201 transgenic mice are shown in FIGS. 11 and 12, the vertical axis represents the number of cells that reacted in the number of seeded cells, and the horizontal axis represents the compound or peptide administered to the mouse.
- the black bars in FIG. 11 show the results of culturing spleen cells derived from HLA-A0201 transgenic mice while pulsing the peptide represented by SEQ ID NO: 5, and the white bars show the results of non-pulse culture.
- the difference between the value of the black bar and the white bar indicates the number of peptide-specific CTLs
- the administration of the peptide represented by SEQ ID NO: 5 or the compound represented by formula (9) in the mouse in vivo 5 shows that CTL specific to the peptide represented by 5 was induced.
- the value of the white bar is not recognized. This indicates that the spleen cells of HLA-A0201 transgenic mice did not react at all when the peptide of interest was not pulsed.
- production of IFN ⁇ specific for the peptide represented by SEQ ID NO: 5 was confirmed in splenocytes derived from HLA-A0201 transgenic mice.
- the number of IFN ⁇ -producing cells specific for the peptide represented by SEQ ID NO: 5 induced by administration of the compound represented by formula (9) in FIG. More than the number of peptide-specific IFN ⁇ producing cells induced by administration.
- the black bars in FIG. 12 show the results of culturing splenocytes derived from HLA-A0201 transgenic mice while pulsing the peptide represented by SEQ ID NO: 24, and the white bars show the results of non-pulse culture.
- the difference between the value of the black bar and the white bar indicates the number of peptide-reactive cells, and the helper peptide-reactive property represented by SEQ ID NO: 24 is expressed in the mouse in vivo by administration of the compound represented by formula (9) It shows that cells were induced, and that the peptide-reactive cell represented by SEQ ID NO: 24 was not induced in the mouse body by administration of the peptide represented by SEQ ID NO: 5.
- the value of the white bar is hardly recognized. This indicates that the spleen cells of HLA-A0201 transgenic mice did not react when the peptide of interest was not pulsed.
- the compound represented by the formula (9) can induce cells reactive to the CTL specific to the peptide represented by SEQ ID NO: 5 and the helper peptide represented by SEQ ID NO: 24. It became clear.
- the compound represented by the formula (9) is actually produced into the peptides represented by SEQ ID NOs: 5 and 24 after undergoing disulfide bond cleavage and appropriate trimming by ERAP-1 in vivo in mice. It was strongly suggested.
- the compound represented by the formula (9), which is an example of the compound of the present invention is a conjugate in which two different peptides are complexed via a disulfide bond as shown in the formula (1). It has become apparent that it is actually a WT1 cancer antigen peptide conjugate vaccine that can induce CTL and helper peptide reactive cells in vivo.
- SEQ ID NOs: 238 and 239 are amide bonds of RMFPNAPYL (SEQ ID NO: 2) which is an HLA-A0201 restricted WT1 peptide and CYTWNQMNL (SEQ ID NO: 4) which is an HLA-A2402 restricted WT1 peptide. It is a linked long chain peptide.
- the HLA-A0201 transgenic mouse and the HLA-A2402 transgenic mouse are as described in Test Example 2.
- the compound represented by formula (5) and the peptide represented by SEQ ID NO: 238, 239 are each dissolved in dimethyl sulfoxide (DMSO) to 40 mg / mL, and further diluted to 5 mg / mL with water for injection. Then, it was mixed with an equal amount of incomplete Freund's adjuvant (IFA) and emulsified. The emulsified compound was administered into the ridge skin of the mouse at 4 sites at 250 ⁇ g / site. One week later, the mouse was euthanized with CO 2 gas, and then the spleen was removed and spleen cells were prepared. An IFN ⁇ ELISPOT assay kit was used to measure IFN ⁇ production.
- DMSO dimethyl sulfoxide
- IFA incomplete Freund's adjuvant
- the ELISPOT plate was treated with anti-mouse IFN ⁇ antibody and blocked on RPMI 1640 medium containing 10% FBS on the day. Seed prepared spleen cells from HLA-A0201 transgenic mice at 0.25 ⁇ 10 6 cells / well and spleen cells from HLA-A2402 transgenic mice at 1 ⁇ 10 6 cells / well on a blocked ELISPOT plate did.
- the peptide (SEQ ID NO: 2, 4) was dissolved in DMSO to 40 mg / mL, and further diluted to 40 ⁇ g / mL in RPMI 1640 medium containing 10% FBS.
- the diluted peptide (SEQ ID NO: 2) was added to splenocytes derived from HLA-A0201 transgenic mice at a final concentration of 10 ⁇ g / mL.
- the diluted peptide (SEQ ID NO: 4) was added to splenocytes derived from HLA-A2402 transgenic mice at a final concentration of 10 ⁇ g / mL.
- In vitro peptide re-stimulation was applied by culturing the splenocytes to which the peptide was added for 18 hours at 37 ° C. under 5% CO 2 . After incubation, the supernatant was removed and the ELISPOT plate was developed according to the attached protocol. The number of spots developed was measured by an ImmunoSpot Analyzer (manufactured by C.T.L.).
- the results of IFN ⁇ ELISPOT assay using HLA-A0201 transgenic mice are shown in FIG. 13, and the results of IFN ⁇ ELISPOT assay using HLA-A2402 transgenic mice are shown in FIG.
- the vertical axis indicates the number of cells that reacted in the number of seeded cells.
- the black bars and white bars in FIG. 13 show the results of culturing splenocytes derived from HLA-A0201 transgenic mice in the presence and absence of the peptide of interest represented by SEQ ID NO: 2,
- the white bars show the results of culturing spleen cells derived from HLA-A2402 transgenic mice in the presence and absence of the peptide of interest represented by SEQ ID NO: 4.
- the difference between the values of the black bar and the white bar is specific for each peptide of interest induced in the mouse by administration of the compound represented by formula (5) and the peptide represented by SEQ ID NOs: 238 and 239. Indicates the number of CTLs.
- the value of the white bar is not recognized in each figure. This indicates that the splenocytes of each transgenic mouse did not react at all in the absence of the target peptide.
- the target peptide-specific IFN ⁇ production represented by SEQ ID NO: 2 was expressed by formula (5).
- the target peptide-specific IFN ⁇ production represented by SEQ ID NO: 4 was confirmed.
- the target peptide-specific IFN ⁇ production represented by SEQ ID NO: 2 was confirmed.
- the number was very small.
- splenocytes derived from HLA-A2402 transgenic mice administered with the peptide represented by SEQ ID NO: 2308 production of the target peptide-specific IFN ⁇ represented by SEQ ID NO: 4 was confirmed.
- the target peptide-specific IFN ⁇ production represented by SEQ ID NO: 2 was observed, but in formula (5) The number was small compared to splenocytes derived from HLA-A0201 transgenic mice administered with the compounds represented.
- production of the target peptide-specific IFN ⁇ represented by SEQ ID NO: 4 was confirmed.
- the compound represented by the formula (5) of the present invention efficiently induces both the peptide-specific CTL represented by SEQ ID NO: 2 and the peptide-specific CTL represented by SEQ ID NO: 4. It became clear to get.
- the long-chain peptide represented by SEQ ID NO: 238, 239 is efficient for both the peptide-specific CTL represented by SEQ ID NO: 2 and the peptide-specific CTL represented by SEQ ID NO: 4. It was not possible to induce.
- SEQ ID NOs: 240 and 241 are RMFPNAPYL (SEQ ID NO: 2) which is an HLA-A0201-restricted WT1 peptide and CYTWNQMNL (SEQ ID NO: 4) which is an HLA-A2402-restricted WT1 peptide.
- RMFPNAPYL SEQ ID NO: 2
- CYTWNQMNL SEQ ID NO: 4
- the HLA-A0201 transgenic mouse and the HLA-A2402 transgenic mouse are as described in Test Example 2.
- CTL for the target peptide (SEQ ID NO: 2, 4) is induced by administration of the compound represented by formula (5) and the peptide represented by SEQ ID NO: 240, 241 is determined by the formula (5).
- spleen cells derived from the above mice administered with the compound represented by (SEQ ID NO: 240, 241) and the peptide (SEQ ID NO: 2, 4) are restimulated with the peptide (SEQ ID NO: 2, 4), do they produce IFN ⁇ ? Judgment was made by measuring.
- the compound represented by formula (5) is dissolved in dimethyl sulfoxide (DMSO) at 80 mg / mL, further diluted to 10 mg / mL with water for injection, and then an equal amount of incomplete Freund's adjuvant (IFA). And emulsified.
- DMSO dimethyl sulfoxide
- IFA incomplete Freund's adjuvant
- emulsified The emulsified compound was administered into the ridge skin of the mouse at two sites at 500 ⁇ g / site.
- the peptide represented by SEQ ID NOs: 240 and 241 was dissolved in dimethyl sulfoxide (DMSO) at 80 mg / mL, and further diluted to 11 mg / mL with water for injection. Mix and emulsify.
- the emulsified compound was administered into the ridge skin of mice at two sites at 550 ⁇ g / site. One week later, the mouse was euthanized with CO 2 gas, and then the spleen was removed and spleen cells were prepared. An IFN ⁇ ELISPOT assay kit was used to measure IFN ⁇ production. On the day before splenocyte preparation, the ELISPOT plate was treated with anti-mouse IFN ⁇ antibody and blocked on RPMI 1640 medium containing 10% FBS on the day.
- the prepared spleen cells derived from HLA-A0201 transgenic mice were blocked at 0.25 ⁇ 10 6 cells / well and spleen cells derived from HLA-A2402 transgenic mice were blocked at 1.5 ⁇ 10 6 cells / well. Sowing.
- the peptide (SEQ ID NO: 2, 4) was dissolved in DMSO to 40 mg / mL, and further diluted to 40 ⁇ g / mL in RPMI 1640 medium containing 10% FBS.
- the diluted peptide (SEQ ID NO: 2) was added to splenocytes derived from HLA-A0201 transgenic mice at a final concentration of 10 ⁇ g / mL.
- the diluted peptide (SEQ ID NO: 4) was added to splenocytes derived from HLA-A2402 transgenic mice at a final concentration of 10 ⁇ g / mL.
- In vitro peptide re-stimulation was applied by culturing the splenocytes to which the peptide had been added for 17 hours at 37 ° C. under 5% CO 2 . After incubation, the supernatant was removed and the ELISPOT plate was developed according to the attached protocol. The number of spots developed was measured by an ImmunoSpot Analyzer (manufactured by C.T.L.).
- the results of IFN ⁇ ELISPOT assay using HLA-A0201 transgenic mice are shown in FIG. 15, and the results of IFN ⁇ ELISPOT assay using HLA-A2402 transgenic mice are shown in FIG.
- the vertical axis indicates the number of cells that reacted in the number of seeded cells.
- the black bars and white bars in FIG. 15 show the results of culturing splenocytes derived from HLA-A0201 transgenic mice in the presence and absence of the peptide of interest represented by SEQ ID NO: 2,
- the white bars show the results of culturing spleen cells derived from HLA-A2402 transgenic mice in the presence and absence of the peptide of interest represented by SEQ ID NO: 4.
- the difference between the values of the black bars and the white bars is specific to each peptide of interest induced by administration of the compound represented by formula (5) and the peptides represented by SEQ ID NOs: 240 and 241. Indicates the number of CTLs. The value of the white bar is not recognized in each figure. This indicates that the splenocytes of the respective transgenic mice did not react in the absence of the target peptide. As a result of this test, in the splenocytes derived from HLA-A0201 transgenic mice administered with the compound represented by formula (5), the target peptide-specific IFN ⁇ production represented by SEQ ID NO: 2 was expressed by formula (5).
- the target peptide-specific IFN ⁇ production represented by SEQ ID NO: 4 was confirmed.
- splenocytes derived from HLA-A0201 transgenic mice administered with the peptide represented by SEQ ID NO: 240 produced very little target peptide-specific IFN ⁇ produced by SEQ ID NO: 2
- the target peptide-specific IFN ⁇ production represented by SEQ ID NO: 4 was confirmed.
- splenocytes derived from HLA-A0201 transgenic mice administered with the peptide represented by SEQ ID NO: 241 have very little production of the target peptide-specific IFN ⁇ represented by SEQ ID NO: 2, and are represented by SEQ ID NO: 241.
- the target peptide-specific IFN ⁇ production represented by SEQ ID NO: 4 was confirmed, but the compound represented by formula (5) was Compared with the spleen cells derived from the HLA-A2402 transgenic mice administered, the number was very small.
- the compound represented by the formula (5) of the present invention efficiently induces both the peptide-specific CTL represented by SEQ ID NO: 2 and the peptide-specific CTL represented by SEQ ID NO: 4. It became clear to get.
- the long-chain peptide containing the peptide spacer represented by SEQ ID NOs: 240 and 241 has a peptide-specific CTL represented by SEQ ID NO: 2 and a peptide-specific CTL represented by SEQ ID NO: 4. Both could not be guided efficiently.
- Test Example 10 For the peptide synthesized in Reference Example 3 and the compounds (conjugates) synthesized in Examples 6 and 9, solubility was measured in the same manner as in Test Example 3, and the respective solubilities are shown in Table 66.
- Examples 11-12 In the same manner as in Example 2, peptides having the amino acid sequences of SEQ ID NOS: 242 to 243 were synthesized. Table 67 shows the results of mass spectrometry. The peptides listed in Table 67 are compounds of the present invention.
- Example 13 In the same manner as in Example 1, each compound (conjugate) represented by Formula 10 was synthesized. Table 68 shows the results of mass spectrometry. (In the formula, the bond between C and C represents a disulfide bond.)
- Step 1 Synthesis of Fmoc-Cys (Mmt) -Ala-SBn (Mmt is 4-Methoxytrityl) (Synthesis of Fmoc-C (Mmt) A-SBn) Fmoc-Cys (Mmt) -OH (4.80 g), N, N-diisopropylethylamine (2.56 mL), hexafluorophosphoric acid (benzotriazol-1-yloxy) tripyrrolidinophosphonium (4.50 g) and the known A solution of H-Ala-SBn in chloroform (20 mL) synthesized by a method (for example, Journal of Organic Chemistry, Vol. 64, No.
- Step 2 Synthesis of H-Cys (Mmt) -Ala-Cys-Tyr-Thr-Trp-Asn-Gln-Met-Asn-Leu-OH (Synthesis of C (Mmt) ACYTWNQMNL) Fmoc-Cys (Mmt) -Ala-SBn (11 mg) obtained in Step 1 and H-Cys-Tyr-Thr-Trp-Asn-Gln-Met-Asn-Leu synthesized by a known method (for example, WO07 / 069033) -OH (21 mg), N, N-diisopropylethylamine (200 ⁇ L), 3,3 ′, 3 ′′ -phosphanetryl tripropanoic acid hydrochloride (1 mg), 4-mercaptophenylacetic acid (1 mg) and 0.1 M phosphorus A solution of sodium acid buffer (pH 7.5, 200 ⁇ L) in DMF (400 ⁇
- Step 4 Synthesis of H-Cys (SPy) -Asn-Lys-Arg-Tyr-Phe-Lys-Leu-Ser-His-Leu-Gln-Met-His-Ser-Arg-Lys-OH (Synthesis of C (SPy) NKRYFKLLSHLQMHSRK ) H-Cys-Asn-Lys-Arg-Tyr-Phe-Lys-Leu-Ser-His-Leu-Gln-Met-His-Ser-Arg-Lys-OH (182 mg) obtained in Reference Example 1 and 2,2 A solution of '-dipyridyl bisulfide (0.2 M isopropanol solution, 544 ⁇ L) in 20% w / w acetic acid (4 mL) was stirred at room temperature for 17 hours.
- Example 13 In the same manner as in Example 2, a peptide consisting of the amino acid sequence of SEQ ID NO: 244 was synthesized. Table 71 shows the results of mass spectrometry. Since the peptides described in the table are not compounds of the present invention, they are described as reference examples.
- the compound represented by the formula is a compound in which the cancer antigen peptide A is RMFPNAPYL (SEQ ID NO: 2) and the cancer antigen peptide B is WAPVLDFAPPGASAYGSL (SEQ ID NO: 244).
- RMFPNAPYL SEQ ID NO: 2 is an HLA-A0201 restricted WT1 peptide
- WAPVLDFAPPGASAYGSL SEQ ID NO: 244
- MHC class II restricted WT1 peptide ie, a helper peptide
- HLA-A0201 transgenic mice are as described in Test Examples 2 and 5.
- CTL against the target peptide (SEQ ID NO: 2) is induced by administration of the compound represented by the formula (10) is determined based on the spleen derived from the mouse administered with the compound represented by the formula (10). It was determined by measuring whether IFN ⁇ was produced when the cells were restimulated with the peptide (SEQ ID NO: 2). Whether or not the helper peptide (SEQ ID NO: 244) is acting in vivo is represented by the spleen cell derived from the mouse administered with the compound represented by formula (10) and SEQ ID NO: 2. Spleen cells derived from the above mice administered with the peptide were judged by comparing the number of IFN ⁇ producing cells when restimulated with the peptide (SEQ ID NO: 2).
- the compound represented by SEQ ID NO: 2 is dissolved in dimethyl sulfoxide (DMSO) at 80 mg / mL, further diluted to 3 mg / mL with water for injection, and then an equal amount of incomplete Freund's adjuvant (IFA). And emulsified.
- the emulsified compound was administered at two sites at 150 ⁇ g / site into the ridge skin of mice.
- the compound represented by the formula (10) is dissolved in dimethyl sulfoxide (DMSO) at 80 mg / mL, further diluted to 8.5 mg / mL with water for injection, and then an equivalent amount of incomplete Freund's adjuvant (IFA) and Mix and emulsify.
- the emulsified compound was administered into the ridge skin of mice at 425 ⁇ g / site at two sites.
- the substance amount of the peptide of SEQ ID NO: 2 contained in the dose per mouse of the compound represented by the formula (10) is included in the dose per mouse of the peptide represented by SEQ ID NO: 2.
- the amount was adjusted to be equal to the amount of substance.
- the DMSO concentration contained in each emulsion was also made constant.
- One week later, the mouse was euthanized with CO 2 gas, and then the spleen was removed and spleen cells were prepared.
- An IFN ⁇ ELISPOT assay kit was used to measure IFN ⁇ production.
- the ELISPOT plate was treated with anti-mouse IFN ⁇ antibody and blocked on RPMI 1640 medium containing 10% FBS on the day.
- the prepared spleen cells derived from HLA-A0201 transgenic mice were seeded on a blocked ELISPOT plate at 0.125 ⁇ 10 6 cells / well.
- the peptide (SEQ ID NO: 2) was dissolved in DMSO to 40 mg / mL, and further diluted to 40 ⁇ g / mL in RPMI 1640 medium containing 10% FBS.
- the diluted peptide (SEQ ID NO: 2) was added to splenocytes derived from HLA-A0201 transgenic mice at a final concentration of 10 ⁇ g / mL.
- In vitro peptide re-stimulation was applied by culturing the splenocytes to which the peptide was added for 19 hours at 37 ° C. under 5% CO 2 . After incubation, the supernatant was removed and the ELISPOT plate was developed according to the attached protocol. The number of spots developed was measured by an ImmunoSpot Analyzer (manufactured by C.T.L.).
- FIG. 17 The results of IFN ⁇ ELISPOT assay using HLA-A0201 transgenic mice are shown in FIG. In FIG. 17, the vertical axis represents the number of cells that reacted in the number of seeded cells, and the horizontal axis represents the compound or peptide administered to the mouse.
- the black bars in FIG. 17 show the results of culturing splenocytes derived from HLA-A0201 transgenic mice while pulsing the peptide represented by SEQ ID NO: 2, and the white bars show the results of non-pulse culture.
- the difference between the value of the black bar and the white bar indicates the number of peptide-specific CTLs
- the administration of the peptide represented by SEQ ID NO: 2 or the compound represented by formula (10) in the mouse in vivo 2 shows that CTL specific to the peptide represented by 2 was induced.
- the value of the white bar is not recognized. This indicates that the spleen cells of HLA-A0201 transgenic mice did not react at all when the peptide of interest was not pulsed.
- production of IFN ⁇ specific for the peptide represented by SEQ ID NO: 2 was confirmed in spleen cells derived from HLA-A0201 transgenic mice.
- the compound represented by the formula (10) can induce CTL specific for the peptide represented by SEQ ID NO: 2.
- IFN ⁇ -producing cells specific for the peptide represented by SEQ ID NO: 2 are compared with the case where the peptide represented by SEQ ID NO: 2 is administered. Most often observed is that a cell reactive to the helper peptide represented by SEQ ID NO: 244 generated from the compound represented by the formula (10) was induced, and thus represented by SEQ ID NO: 2. It was assumed that the induction of CTL specific for the peptide was enhanced.
- the compound represented by formula (10) is actually produced into the peptides represented by SEQ ID NOs: 2 and 244 after undergoing disulfide bond cleavage and appropriate trimming by ERAP-1 in the mouse body. It was strongly suggested. That is, the compound represented by the formula (10), which is an example of the compound of the present invention, is a conjugate in which two different peptides are complexed via a disulfide bond as shown in the formula (1). It was revealed that this is actually a WT1 cancer antigen peptide conjugate vaccine capable of inducing CTL and helper peptide reactive cells in vivo.
- the compound represented by the formula is a compound in which the cancer antigen peptide A is RMFPNAPYL (SEQ ID NO: 2) and the cancer antigen peptide C is WAPVLDFAPPGASAYGSLC (SEQ ID NO: 243).
- RMFPNAPYL SEQ ID NO: 2
- WAPVLDFAPPGASAYGSL SEQ ID NO: 244
- MHC class II restricted WT1 peptide ie, a helper peptide
- HLA-A0201 transgenic mice are as described in Test Examples 2 and 5.
- CTL against the target peptide (SEQ ID NO: 2) is induced by administration of the compound represented by the formula (11) is determined based on the spleen derived from the mouse administered with the compound represented by the formula (11). It was determined by measuring whether IFN ⁇ was produced when the cells were restimulated with the peptide (SEQ ID NO: 2). Whether or not the helper peptide (SEQ ID NO: 244) is acting in vivo is represented by the above mouse-derived splenocytes administered with the compound represented by formula (11), and SEQ ID NO: 2. Spleen cells derived from the above mice administered with the peptide were judged by comparing the number of IFN ⁇ producing cells when restimulated with the peptide (SEQ ID NO: 2).
- FIG. 18 The results of IFN ⁇ ELISPOT assay using HLA-A0201 transgenic mice are shown in FIG.
- the vertical axis represents the number of cells that reacted in the number of seeded cells
- the horizontal axis represents the compound or peptide administered to the mouse.
- the black bars in FIG. 18 show the results of culturing spleen cells derived from HLA-A0201 transgenic mice while pulsing the peptide represented by SEQ ID NO: 2, and the white bars show the results of non-pulse culture.
- the difference between the values of the black bar and the white bar indicates the number of peptide-specific CTLs
- the administration of the peptide represented by SEQ ID NO: 2 or the compound represented by formula (11) in the mouse in vivo 2 shows that CTL specific to the peptide represented by 2 was induced.
- the value of the white bar is not recognized. This indicates that the spleen cells of HLA-A0201 transgenic mice did not react at all when the peptide of interest was not pulsed.
- production of IFN ⁇ specific for the peptide represented by SEQ ID NO: 2 was confirmed in spleen cells derived from HLA-A0201 transgenic mice.
- cancer antigen peptide B in the formula (1) is WAPVLDFAPPGASAYGSL (SEQ ID NO: 244). It was suggested that cancer antigen peptide C is a more preferred embodiment of the invention compared to WAPVLDFAPPGASAYGSLC (SEQ ID NO: 243).
- RMFPNAPYL (SEQ ID NO: 2) contained in the compound represented by HLA-A0201 restricted WT1 peptide, CYTWNQMNL (SEQ ID NO: 4) is HLA-A2402 restricted WT1 peptide, and CNKRYFKLSHHLQMHHSRK (SEQ ID NO: 22) is MHC class II restricted WT1 peptide (ie helper peptide).
- the HLA-A0201 transgenic mouse and the HLA-A2402 transgenic mouse are as described in Test Examples 2 and 5.
- CTL against the target peptide (SEQ ID NOs: 2, 4) is induced by administration of the compound represented by the formula (12) is derived from the above mouse administered with the compound represented by the formula (12). It was judged by measuring whether spleen cells of IFN ⁇ were produced when restimulation was performed with a peptide (SEQ ID NO: 2, 4). Whether or not the helper peptide (SEQ ID NO: 22) is acting in vivo is represented by the spleen cell derived from the mouse administered with the compound represented by formula (12) and formula (5). Spleen cells derived from the above mice administered with the compound were judged by comparing the number of IFN ⁇ -producing cells when restimulated with the peptide (SEQ ID NOs: 2, 4).
- the compound represented by Formula (5) is dissolved in 80 mg / mL with dimethyl sulfoxide (DMSO), further diluted to 3 mg / mL with water for injection, and then mixed with an equal amount of Montanide ISA51VG to obtain an emulsion. Made it.
- the emulsified compound was administered at two sites at 150 ⁇ g / site into the ridge skin of mice.
- the compound represented by the formula (12) was dissolved in dimethyl sulfoxide (DMSO) at 80 mg / mL, further diluted to 6 mg / mL with water for injection, and then mixed with an equal amount of Montanide ISA51VG to be emulsified. .
- the emulsified compound was administered into the ridge skin of the mouse at two sites at 300 ⁇ g / site.
- the amount of the compound of the formula (5) contained in the dose per mouse of the compound represented by the formula (12) is included in the dose of the compound represented by the formula (5) per mouse.
- the amount was adjusted to be equal to the amount of substance.
- the DMSO concentration contained in each emulsion was also made constant.
- An IFN ⁇ ELISPOT assay kit was used to measure IFN ⁇ production.
- the ELISPOT plate was treated with anti-mouse IFN ⁇ antibody and blocked on RPMI 1640 medium containing 10% FBS on the day.
- the prepared spleen cells derived from HLA-A0201 transgenic mice and spleen cells derived from HLA-A2402 transgenic mice were each seeded on a blocked ELISPOT plate at 0.25 ⁇ 10 6 cells / well.
- the peptide (SEQ ID NO: 2, 4) was dissolved in DMSO to 40 mg / mL, and further diluted to 40 ⁇ g / mL in RPMI 1640 medium containing 10% FBS.
- the diluted peptide (SEQ ID NO: 2) was added to splenocytes derived from HLA-A0201 transgenic mice at a final concentration of 10 ⁇ g / mL.
- the diluted peptide (SEQ ID NO: 4) was added to splenocytes derived from HLA-A2402 transgenic mice at a final concentration of 10 ⁇ g / mL.
- In vitro peptide re-stimulation was applied by culturing the splenocytes to which the peptide had been added for 17 hours at 37 ° C. under 5% CO 2 . After incubation, the supernatant was removed and the ELISPOT plate was developed according to the attached protocol. The number of spots developed was measured by an ImmunoSpot Analyzer (manufactured by C.T.L.).
- the results of IFN ⁇ ELISPOT assay using HLA-A0201 transgenic mice are shown in FIG. 19, and the results of IFN ⁇ ELISPOT assay using HLA-A2402 transgenic mice are shown in FIG. In each figure, the vertical axis indicates the number of cells that reacted in the number of seeded cells.
- the black bars and white bars in FIG. 19 show the results of culturing splenocytes derived from HLA-A0201 transgenic mice in the presence and absence of the peptide of interest represented by SEQ ID NO: 2,
- the white bars show the results of culturing spleen cells derived from HLA-A2402 transgenic mice in the presence and absence of the peptide of interest represented by SEQ ID NO: 4.
- the difference between the values of the black bars and the white bars indicates the number of each peptide-specific CTL of interest induced in the mouse body by administration of the compounds represented by the formulas (5) and (12).
- the value of the white bar is not recognized in each figure. This indicates that the splenocytes of the respective transgenic mice did not react in the absence of the target peptide.
- the target peptide-specific IFN ⁇ production represented by SEQ ID NO: 2 was obtained in splenocytes derived from HLA-A0201 transgenic mice administered with the compounds represented by formula (5) and formula (12).
- the number of IFN ⁇ -producing cells specific for the peptide represented by SEQ ID NO: 2 induced by administration of the compound represented by formula (12) is the number of the compound represented by formula (5). More than the number of peptide-specific IFN ⁇ producing cells induced by administration.
- the number of IFN ⁇ -producing cells specific for the peptide represented by SEQ ID NO: 4 induced by administration of the compound represented by formula (12) in FIG. There was no significant difference compared to the number of peptide-specific IFN ⁇ producing cells induced by administration.
- the compound represented by the formula (12) can induce CTL specific for the peptides represented by SEQ ID NOs: 2, 4. Further, when the compound represented by the formula (12) is administered, the IFN ⁇ -producing cells specific for the peptide represented by SEQ ID NO: 2 are compared with the case where the compound represented by the formula (5) is administered. Most often observed is that a cell reactive to the helper peptide represented by SEQ ID NO: 22 generated from the compound represented by formula (12) was induced, and thus represented by SEQ ID NO: 2. It was assumed that the induction of CTL specific for the peptide was enhanced.
- the number of IFN ⁇ -producing cells specific for the peptide represented by SEQ ID NO: 4 is compared between the case where the compound represented by formula (12) is administered and the case where the compound represented by formula (5) is administered. No significant difference was observed because HLA-A2402 transgenic mice did not express human MHC class II, and thus no cells reactive to the helper peptide represented by SEQ ID NO: 22 were induced. It was guessed. Therefore, the compound represented by the formula (12) is actually produced into the peptides represented by SEQ ID NOs: 2, 4 and 22 after undergoing disulfide bond cleavage and appropriate trimming by ERAP-1 in the mouse body.
- the compound represented by the formula (12), which is an example of the compound of the present invention is a conjugate in which three different peptides are complexed via a disulfide bond, and is actually a CTL and helper in vivo. It was revealed to be a WT1 cancer antigen peptide conjugate vaccine capable of inducing peptide reactive cells.
- RMFPNAPYL (SEQ ID NO: 2) contained in the compound represented by HLA-A0201 restricted WT1 peptide, CYTWNQMNL (SEQ ID NO: 4) is HLA-A2402 restricted WT1 peptide, and WAPVLDFAPPGASAYGSL (SEQ ID NO: 244) is MHC class II restricted WT1 peptide (ie helper peptide).
- the HLA-A0201 transgenic mouse and the HLA-A2402 transgenic mouse are as described in Test Examples 2 and 5.
- CTL against the target peptide (SEQ ID NO: 2, 4) is induced by administration of the compound represented by formula (14) is derived from the above-mentioned mouse administered with the compound represented by formula (14) It was judged by measuring whether spleen cells of IFN ⁇ were produced when restimulation was performed with a peptide (SEQ ID NO: 2, 4). Whether or not the helper peptide (SEQ ID NO: 244) is acting in vivo is represented by the spleen cell derived from the mouse administered with the compound represented by formula (14) and formula (5). Spleen cells derived from the above mice administered with the compound were judged by comparing the number of IFN ⁇ producing cells when restimulated with the peptide (SEQ ID NO: 2).
- CTL induction test was performed in the same manner as in Test Example 12.
- the compound represented by the formula (14) is dissolved in dimethyl sulfoxide (DMSO) at 80 mg / mL, further diluted to 5.6 mg / mL with water for injection, and then mixed with an equal amount of Montanide ISA51VG to form an emulsion. I let you.
- the emulsified compound was administered into the ridge skin of the mouse at 2 sites at 280 ⁇ g / site.
- the results of IFN ⁇ ELISPOT assay using HLA-A0201 transgenic mice are shown in FIG. 21, and the results of IFN ⁇ ELISPOT assay using HLA-A2402 transgenic mice are shown in FIG.
- the vertical axis indicates the number of cells that reacted in the number of seeded cells.
- the black bars and white bars in FIG. 21 show the results of culturing splenocytes derived from HLA-A0201 transgenic mice in the presence and absence of the peptide of interest represented by SEQ ID NO: 2,
- the white bars show the results of culturing spleen cells derived from HLA-A2402 transgenic mice in the presence and absence of the peptide of interest represented by SEQ ID NO: 4.
- the difference between the values of the black bars and the white bars indicates the number of each peptide-specific CTL of interest induced in the mouse body by administration of the compounds represented by the formulas (5) and (14).
- the value of the white bar is not recognized in each figure. This indicates that the splenocytes of the respective transgenic mice did not react in the absence of the target peptide.
- the target peptide-specific IFN ⁇ production represented by SEQ ID NO: 2 was produced.
- the compound represented by the formula (14) can induce CTL specific to the peptide represented by SEQ ID NO: 2, 4.
- IFN ⁇ -producing cells specific for the peptide represented by SEQ ID NO: 2 are compared with the case where the compound represented by formula (5) is administered. Most often observed is that a cell reactive to the helper peptide represented by SEQ ID NO: 244 generated from the compound represented by the formula (14) was induced, and thus represented by SEQ ID NO: 2. It was assumed that the induction of CTL specific for the peptide was enhanced.
- the IFN ⁇ -producing cells specific for the peptide represented by SEQ ID NO: 4 are compared with the case where the compound represented by formula (5) is administered. Many were recognized by binding of the peptide represented by SEQ ID NO: 244 to mouse MHC class II expressed in HLA-A2402 transgenic mice, and induction of cells reactive to the helper peptide. : It was inferred that the induction of CTL specific to the peptide represented by 4 was enhanced. Therefore, the compound represented by the formula (14) is actually produced into the peptides represented by SEQ ID NOs: 2, 4, and 244 after undergoing disulfide bond cleavage and appropriate trimming by ERAP-1 in the mouse body.
- the compound represented by the formula (14), which is an example of the compound of the present invention is a conjugate in which three different peptides are complexed via disulfide bonds, and is actually a CTL and helper in vivo. It was revealed to be a WT1 cancer antigen peptide conjugate vaccine capable of inducing peptide reactive cells.
- HLA-A0201 transgenic mice were used for the CTL inducing ability of a cocktail vaccine prepared by mixing the compound represented by formula (5) synthesized in Example 1 and the peptide represented by SEQ ID NO: 22 synthesized in Reference Example 1. It was evaluated by an in vivo CTL induction test.
- Formula (5) :
- RMFPNAPYL (SEQ ID NO: 2) contained in the compound represented by HLA-A0201 restricted WT1 peptide, CYTWNQMNL (SEQ ID NO: 4) is HLA-A2402 restricted WT1 peptide, and CNKRYFKLSHHLQMHHSRK (SEQ ID NO: 22) is MHC class II restricted WT1 peptide (ie helper peptide).
- HLA-A0201 transgenic mice are as described in Test Examples 2 and 5.
- CTL against the target peptide (SEQ ID NO: 2) is induced by administration of the compound represented by formula (5) is determined based on the spleen derived from the mouse administered with the compound represented by formula (5). It was determined by measuring whether IFN ⁇ was produced when the cells were restimulated with the peptide (SEQ ID NO: 2).
- helper peptide (SEQ ID NO: 22) mixed with the formula (5) is acting in vivo is determined by determining whether the compound represented by the formula (5) is spleen derived from the mouse, IFN ⁇ production when spleen cells derived from the above-mentioned mouse administered with the cocktail vaccine of the compound represented by formula (5) and the peptide represented by SEQ ID NO: 22 are restimulated with the peptide (SEQ ID NO: 2) Judgment was made by comparing cell numbers.
- the compound represented by Formula (5) is dissolved in 80 mg / mL with dimethyl sulfoxide (DMSO), further diluted to 3 mg / mL with water for injection, and then mixed with an equal amount of Montanide ISA51VG to obtain an emulsion. Made it.
- the emulsified compound was administered at two sites at 150 ⁇ g / site into the ridge skin of mice.
- the concentration of the compound represented by formula (5) and the peptide represented by SEQ ID NO: 22 after dissolution in dimethyl sulfoxide (DMSO) at 80 mg / mL and dilution with water for injection is represented by formula (5).
- DMSO dimethyl sulfoxide
- This diluted solution was mixed with an equal amount of Montanide ISA51VG to make an emulsion.
- Two cocktail vaccines containing 150 ⁇ g / site of the compound represented by the formula (5) and 137 ⁇ g / site of the peptide represented by SEQ ID NO: 22 were administered into the ridge skin of the mouse.
- the DMSO concentration contained in each emulsion was kept constant.
- the mouse was euthanized with CO 2 gas, and then the spleen was removed and spleen cells were prepared.
- An IFN ⁇ ELISPOT assay kit was used to measure IFN ⁇ production.
- the ELISPOT plate was treated with anti-mouse IFN ⁇ antibody and blocked on RPMI 1640 medium containing 10% FBS on the day.
- the prepared HLA-A0201 transgenic mouse-derived splenocytes were seeded on a blocked ELISPOT plate at 0.25 ⁇ 10 6 cells / well.
- the peptide (SEQ ID NO: 2) was dissolved in DMSO to 40 mg / mL, and further diluted to 40 ⁇ g / mL in RPMI 1640 medium containing 10% FBS.
- the diluted peptide (SEQ ID NO: 2) was added to splenocytes derived from HLA-A0201 transgenic mice at a final concentration of 10 ⁇ g / mL.
- In vitro peptide re-stimulation was applied by culturing the splenocytes to which the peptide had been added for 17 hours at 37 ° C. under 5% CO 2 . After incubation, the supernatant was removed and the ELISPOT plate was developed according to the attached protocol. The number of spots developed was measured by an ImmunoSpot Analyzer (manufactured by C.T.L.).
- FIG. 23 The results of IFN ⁇ ELISPOT assay using HLA-A0201 transgenic mice are shown in FIG.
- the vertical axis represents the number of cells that reacted in the number of seeded cells.
- the black bars and white bars in FIG. 23 show the results of culturing splenocytes derived from HLA-A0201 transgenic mice in the presence and absence of the peptide of interest represented by SEQ ID NO: 2. That is, the difference between the values of the black bars and the white bars is determined by the administration of the cocktail vaccine containing the compound represented by the formula (5) and the helper peptide (SEQ ID NO: 22). The number of target CTLs is shown. In FIG. 23, the value of the white bar is not recognized.
- the cocktail vaccine obtained by mixing the compound represented by the formula (5) and the peptide represented by SEQ ID NO: 22 can induce CTL specific to the peptide represented by SEQ ID NO: 2. became.
- the cocktail vaccine was administered as compared to the case where the compound represented by the formula (5) was administered alone, many IFN ⁇ -producing cells specific to the peptide represented by SEQ ID NO: 2 were observed. It is presumed that the induction of CTL specific to the peptide represented by SEQ ID NO: 2 was enhanced by the induction of cells reactive to the helper peptide represented by SEQ ID NO: 22 contained in the cocktail vaccine. It was. Therefore, it is clear that the cocktail vaccine containing the compound represented by the formula (5) and the helper peptide can induce CTL strongly in the mouse in comparison with the single administration of the compound represented by the formula (5). became.
- HLA-A0201 transgenic mice were used for the CTL inducing ability of a cocktail vaccine prepared by mixing the compound represented by formula (5) synthesized in Example 1 and the peptide represented by SEQ ID NO: 244 synthesized in Reference Example 13. It was evaluated by an in vivo CTL induction test.
- Formula (5) :
- RMFPNAPYL (SEQ ID NO: 2) contained in the compound represented by HLA-A0201 restricted WT1 peptide, CYTWNQMNL (SEQ ID NO: 4) is HLA-A2402 restricted WT1 peptide, and WAPVLDFAPPGASAYGSL (SEQ ID NO: 244) is MHC class II restricted WT1 peptide (ie helper peptide).
- HLA-A0201 transgenic mice are as described in Test Examples 2 and 5.
- CTL against the target peptide (SEQ ID NO: 2) is induced by administration of the compound represented by formula (5) is determined based on the spleen derived from the mouse administered with the compound represented by formula (5). It was determined by measuring whether IFN ⁇ was produced when the cells were restimulated with the peptide (SEQ ID NO: 2).
- helper peptide (SEQ ID NO: 244) mixed with the formula (5) is acting in vivo is determined by determining whether the compound represented by the formula (5) is spleen derived from the mouse, IFN ⁇ production when spleen cells derived from the mouse administered with the cocktail vaccine of the compound represented by the formula (5) and the peptide represented by SEQ ID NO: 244 are restimulated with the peptide (SEQ ID NO: 2) Judgment was made by comparing cell numbers.
- the cocktail vaccine was prepared by dissolving the compound represented by formula (5) and the peptide represented by SEQ ID NO: 244 with dimethyl sulfoxide (DMSO) at 80 mg / mL, and then diluting with water for injection.
- the compound represented by formula (3) was mixed so that the peptide represented by SEQ ID NO: 244 was 2.3 mg / mL.
- This diluted solution was mixed with an equal amount of Montanide ISA51VG to make an emulsion.
- Two cocktail vaccines containing 150 ⁇ g / site of the compound represented by the formula (5) and 115 ⁇ g / site of the peptide represented by SEQ ID NO: 244 were administered into the ridge skin of the mouse.
- FIG. 24 The results of IFN ⁇ ELISPOT assay using HLA-A0201 transgenic mice are shown in FIG.
- the vertical axis represents the number of cells that reacted in the number of seeded cells.
- the black and white bars in FIG. 24 show the results of culturing splenocytes derived from HLA-A0201 transgenic mice in the presence and absence of the peptide of interest represented by SEQ ID NO: 2. That is, the difference between the values of the black bar and the white bar is specific for each peptide of interest that was induced in vivo by administration of a cocktail vaccine containing a compound represented by formula (5) and a helper peptide (SEQ ID NO: 244).
- the number of target CTLs is shown.
- FIG. 244 The number of target CTLs is shown in FIG.
- the value of the white bar is not recognized. This indicates that the splenocytes of the respective transgenic mice did not react in the absence of the target peptide.
- SEQ ID NO: 244 SEQ ID NO: 2
- the target peptide-specific IFN ⁇ production represented by
- the number of IFN ⁇ -producing cells specific for the peptide represented by SEQ ID NO: 2 induced by administration of the cocktail vaccine containing the helper peptide (SEQ ID NO: 244) in FIG. 24 is represented by the formula (5). More than the number of peptide-specific IFN ⁇ producing cells induced by administration of a single compound.
- the cocktail vaccine in which the compound represented by the formula (5) and the peptide represented by SEQ ID NO: 244 are mixed can induce CTL specific to the peptide represented by SEQ ID NO: 2. became.
- the cocktail vaccine was administered as compared to the case where the compound represented by the formula (5) was administered alone, many IFN ⁇ -producing cells specific to the peptide represented by SEQ ID NO: 2 were observed. It is presumed that the induction of CTL specific for the peptide represented by SEQ ID NO: 2 was enhanced by the induction of cells reactive to the helper peptide represented by SEQ ID NO: 244 contained in the cocktail vaccine. It was. Therefore, it is clear that the cocktail vaccine containing the compound represented by the formula (5) and the helper peptide can induce CTL strongly in the mouse in comparison with the single administration of the compound represented by the formula (5). became.
- An example of the preparation of a vaccine containing two WT1 antigen peptides is a cocktail vaccine containing two different peptides as one preparation.
- the problem is the physical properties of the cancer antigen peptide to be mixed.
- Table 60 and Table 66 when two WT1 antigen peptides are cocktailed, two peptides having different solubility, that is, physical properties, are combined into one preparation.
- the conjugate of the present invention is a compound in which two WT1 antigen peptides are linked by a disulfide bond and exhibits a single solubility, that is, a physical property.
- the conjugate of the present invention has a single physical property and has a property of responding to two WT1 antigen peptides as shown in Test Example 2.
- the conjugate of the present invention is a compound capable of causing a response to two WT1 antigen peptides without considering the interaction between the two WT1 antigen peptides, like a cocktail vaccine. It was done.
- HLA-A0201 transgenic mice were used for the CTL inducing ability of a cocktail vaccine prepared by mixing the compound represented by formula (5) synthesized in Example 1 and the peptide represented by SEQ ID NO: 24 synthesized in Reference Example 2. It was evaluated by an in vivo CTL induction test.
- Formula (5) :
- RMFPNAPYL (SEQ ID NO: 2) contained in the compound represented by HLA-A0201 restricted WT1 peptide, CYTWNQMNL (SEQ ID NO: 4) is HLA-A2402 restricted WT1 peptide, and CNKRYFKLHLQMHSRKTTG (SEQ ID NO: 24) is MHC class II restricted WT1 peptide (ie helper peptide).
- HLA-A0201 transgenic mice are as described in Test Examples 2 and 5.
- CTL against the target peptide (SEQ ID NO: 2) is induced by administration of the compound represented by formula (5) is determined based on the spleen derived from the mouse administered with the compound represented by formula (5). It was determined by measuring whether IFN ⁇ was produced when the cells were restimulated with the peptide (SEQ ID NO: 2).
- helper peptide (SEQ ID NO: 24) mixed with the formula (5) is acting in vivo is determined by determining whether the compound represented by the formula (5) is spleen derived from the mouse, IFN ⁇ production when spleen cells derived from the above-mentioned mouse administered with a cocktail vaccine of the compound represented by the formula (5) and the peptide represented by SEQ ID NO: 24 were restimulated with the peptide (SEQ ID NO: 2) Judgment was made by comparing cell numbers.
- the compound represented by Formula (5) is dissolved in 80 mg / mL with dimethyl sulfoxide (DMSO), further diluted to 3 mg / mL with water for injection, and then mixed with an equal amount of Montanide ISA51VG to obtain an emulsion. Made it.
- the emulsified compound was administered at two sites at 150 ⁇ g / site into the ridge skin of mice.
- the concentration of the compound represented by formula (5) and the peptide represented by SEQ ID NO: 24 dissolved in dimethyl sulfoxide (DMSO) at 80 mg / mL and diluted with water for injection is represented by formula (5).
- DMSO dimethyl sulfoxide
- This diluted solution was mixed with an equal amount of Montanide ISA51VG to make an emulsion.
- Two cocktail vaccines containing 150 ⁇ g / site of the compound represented by formula (5) and 156 ⁇ g / site of the peptide represented by SEQ ID NO: 24 were administered into the ridge skin of mice.
- the DMSO concentration contained in each emulsion was kept constant.
- the mouse was euthanized with CO 2 gas, and then the spleen was removed and spleen cells were prepared.
- An IFN ⁇ ELISPOT assay kit was used to measure IFN ⁇ production.
- the ELISPOT plate was treated with anti-mouse IFN ⁇ antibody and blocked on RPMI 1640 medium containing 10% FBS on the day.
- the prepared HLA-A0201 transgenic mouse-derived splenocytes were seeded on a blocked ELISPOT plate at 0.25 ⁇ 10 6 cells / well.
- the peptide (SEQ ID NO: 2) was dissolved in DMSO to 40 mg / mL, and further diluted to 40 ⁇ g / mL in RPMI 1640 medium containing 10% FBS.
- the diluted peptide (SEQ ID NO: 2) was added to splenocytes derived from HLA-A0201 transgenic mice at a final concentration of 10 ⁇ g / mL.
- In vitro peptide re-stimulation was applied by culturing the splenocytes to which the peptide was added for 19 hours at 37 ° C. under 5% CO 2 . After incubation, the supernatant was removed and the ELISPOT plate was developed according to the attached protocol. The number of spots developed was measured by an ImmunoSpot Analyzer (manufactured by C.T.L.).
- FIG. 25 The results of IFN ⁇ ELISPOT assay using HLA-A0201 transgenic mice are shown in FIG.
- the vertical axis represents the number of cells that reacted in the number of seeded cells.
- the black and white bars in FIG. 25 show the results of culturing splenocytes derived from HLA-A0201 transgenic mice in the presence and absence of the peptide of interest represented by SEQ ID NO: 2. That is, the difference between the values of the black bars and the white bars is determined by the administration of the cocktail vaccine containing the compound represented by the formula (5) and the helper peptide (SEQ ID NO: 24) in each mouse peptide The number of target CTLs is shown. In FIG. 25, the value of the white bar is not recognized.
- the cocktail vaccine in which the compound represented by the formula (5) and the peptide represented by SEQ ID NO: 24 are mixed can induce CTL specific to the peptide represented by SEQ ID NO: 2. became.
- the cocktail vaccine was administered as compared to the case where the compound represented by the formula (5) was administered alone, many IFN ⁇ -producing cells specific to the peptide represented by SEQ ID NO: 2 were observed. It is presumed that induction of CTL specific to the peptide represented by SEQ ID NO: 2 was enhanced by the induction of cells reactive to the helper peptide represented by SEQ ID NO: 24 contained in the cocktail vaccine. It was. Therefore, it was clarified that the cocktail vaccine containing the compound represented by the formula (5) and the helper peptide can induce CTL strongly in the mouse in comparison with the single administration of the compound represented by the formula (5).
- SEQ ID NO: 242 synthesized in Example 11 is an N-terminal cysteine extension of SEQ ID NO: 244.
- SEQ ID NO: 244 shows the effect of enhancing CTL induction in the cocktail vaccine shown in Test Example 15. Therefore, in this test, the CTL inducing ability of the cocktail vaccine prepared by mixing the compound represented by the formula (5) synthesized in Example 1 and the peptide represented by SEQ ID NO: 242 was determined using an HLA-A0201 transgenic mouse. Evaluated by in vivo CTL induction test.
- RMFPNAPYL (SEQ ID NO: 2) contained in the compound represented by HLA-A0201 restricted WT1 peptide, CYTWNQMNL (SEQ ID NO: 4) is HLA-A2402 restricted WT1 peptide, and CWAPVLDFAPPGASAYGSL (SEQ ID NO: 242)
- WAPVLDFAPPGASAYGSL (SEQ ID NO: 244) is an MHC class II restricted WT1 peptide (ie helper peptide).
- HLA-A0201 transgenic mice are as described in Test Examples 2 and 5.
- CTL against the target peptide (SEQ ID NO: 2) is induced by administration of the compound represented by formula (5) is determined based on the spleen derived from the mouse administered with the compound represented by formula (5). It was determined by measuring whether IFN ⁇ was produced when the cells were restimulated with the peptide (SEQ ID NO: 2).
- helper peptide (SEQ ID NO: 242) mixed with the formula (5) is acting in vivo is determined by determining whether or not the compound represented by the formula (5) is spleen derived from the mouse, IFN ⁇ production when spleen cells derived from the above-mentioned mouse administered with a cocktail vaccine of the compound represented by formula (5) and the peptide represented by SEQ ID NO: 242 are restimulated with the peptide (SEQ ID NO: 2) Judgment was made by comparing cell numbers.
- the cocktail vaccine was prepared by dissolving the compound represented by formula (5) and the peptide represented by SEQ ID NO: 242 with dimethyl sulfoxide (DMSO) at 80 mg / mL, and the concentration after dilution with water for injection was formula (5)
- the compound represented by formula (3) was mixed at 3 mg / mL, and the peptide represented by SEQ ID NO: 242 was mixed at 2.42 mg / mL.
- This diluted solution was mixed with an equal amount of Montanide ISA51VG to make an emulsion.
- Two cocktail vaccines containing 150 ⁇ g / site of the compound represented by the formula (5) and 121 ⁇ g / site of the peptide represented by SEQ ID NO: 242 were administered into the ridge skin of the mouse.
- FIG. 26 The results of IFN ⁇ ELISPOT assay using HLA-A0201 transgenic mice are shown in FIG.
- the vertical axis indicates the number of cells that reacted in the number of seeded cells.
- the black bars and white bars in FIG. 26 show the results of culturing splenocytes derived from HLA-A0201 transgenic mice in the presence and absence of the peptide of interest represented by SEQ ID NO: 2. That is, the difference between the values of the black bar and the white bar is specific for each peptide of interest that was induced in vivo by administration of a cocktail vaccine containing the compound represented by formula (5) and a helper peptide (SEQ ID NO: 242). The number of target CTLs is shown.
- FIG. 26 The results of IFN ⁇ ELISPOT assay using HLA-A0201 transgenic mice are shown in FIG.
- the vertical axis indicates the number of cells that reacted in the number of seeded cells.
- the value of the white bar is not recognized. This indicates that the splenocytes of the respective transgenic mice did not react in the absence of the target peptide.
- SEQ ID NO: 242 The target peptide-specific IFN ⁇ production represented by
- the number of IFN ⁇ -producing cells specific for the peptide represented by SEQ ID NO: 2 induced by administration of the cocktail vaccine containing the helper peptide (SEQ ID NO: 242) is represented by formula (5). More than the number of peptide-specific IFN ⁇ producing cells induced by administration of a single compound.
- the cocktail vaccine in which the compound represented by the formula (5) and the peptide represented by SEQ ID NO: 242 are mixed can induce CTL specific to the peptide represented by SEQ ID NO: 2. became.
- the cocktail vaccine was administered as compared to the case where the compound represented by the formula (5) was administered alone, many IFN ⁇ -producing cells specific to the peptide represented by SEQ ID NO: 2 were observed.
- Specific to the peptide represented by SEQ ID NO: 2 by induction of cells reactive to the helper peptide represented by SEQ ID NO: 244 contained in the peptide represented by SEQ ID NO: 242 in the cocktail vaccine It was assumed that the induction of CTL was enhanced. Therefore, it was clarified that the cocktail vaccine containing the compound represented by the formula (5) and the helper peptide can induce CTL strongly in the mouse in comparison with the single administration of the compound represented by the formula (5).
- SEQ ID NO: 243 synthesized in Example 12 is a C-terminal cysteine extension of SEQ ID NO: 244.
- SEQ ID NO: 244 shows the effect of enhancing CTL induction in the cocktail vaccine shown in Test Example 15. Therefore, in this test, the CTL inducing ability of the cocktail vaccine prepared by mixing the compound represented by the formula (5) synthesized in Example 1 and the peptide represented by SEQ ID NO: 243 was determined using an HLA-A0201 transgenic mouse. Evaluated by in vivo CTL induction test.
- RMFPNAPYL (SEQ ID NO: 2) contained in the compound represented by HLA-A0201 restricted WT1 peptide, CYTWNQMNL (SEQ ID NO: 4) is HLA-A2402 restricted WT1 peptide, and WAPVLDFAPPGASAYGSLC (SEQ ID NO: 243)
- WAPVLDFAPPGASAYGSL (SEQ ID NO: 244) is an MHC class II restricted WT1 peptide (ie helper peptide).
- HLA-A0201 transgenic mice are as described in Test Examples 2 and 5.
- CTL against the target peptide (SEQ ID NO: 2) is induced by administration of the compound represented by formula (5) is determined based on the spleen derived from the mouse administered with the compound represented by formula (5). It was determined by measuring whether IFN ⁇ was produced when the cells were restimulated with the peptide (SEQ ID NO: 2).
- helper peptide (SEQ ID NO: 243) mixed with the formula (5) is acting in vivo is determined by determining whether or not the mouse represented by the formula (5) alone is a splenocyte derived from the mouse, IFN ⁇ production when spleen cells derived from the mouse administered with the cocktail vaccine of the compound represented by the formula (5) and the peptide represented by SEQ ID NO: 243 are restimulated with the peptide (SEQ ID NO: 2) Judgment was made by comparing cell numbers.
- the cocktail vaccine was prepared by dissolving the compound represented by formula (5) and the peptide represented by SEQ ID NO: 243 with dimethyl sulfoxide (DMSO) at 80 mg / mL, and then diluting with water for injection.
- the compound represented by formula (3) was mixed at 3 mg / mL, and the peptide represented by SEQ ID NO: 243 was mixed at 2.42 mg / mL.
- This diluted solution was mixed with an equal amount of Montanide ISA51VG to make an emulsion.
- Two cocktail vaccines containing 150 ⁇ g / site of the compound represented by the formula (5) and 121 ⁇ g / site of the peptide represented by SEQ ID NO: 243 were administered into the ridge of the mouse ridge.
- FIG. 27 The results of IFN ⁇ ELISPOT assay using HLA-A0201 transgenic mice are shown in FIG.
- the vertical axis represents the number of cells that reacted in the number of seeded cells.
- the black and white bars in FIG. 27 show the results of culturing splenocytes derived from HLA-A0201 transgenic mice in the presence and absence of the peptide of interest represented by SEQ ID NO: 2. That is, the difference between the values of the black bar and the white bar is specific for each peptide of interest that was induced in vivo by administration of the cocktail vaccine containing the compound represented by formula (5) and the helper peptide (SEQ ID NO: 243). The number of target CTLs is shown.
- FIG. 27 The results of IFN ⁇ ELISPOT assay using HLA-A0201 transgenic mice are shown in FIG.
- the value of the white bar is not recognized. This indicates that the splenocytes of the respective transgenic mice did not react in the absence of the target peptide.
- SEQ ID NO: 243 a cocktail vaccine containing a helper peptide
- SEQ ID NO: 2 The target peptide-specific IFN ⁇ production represented by
- the number of IFN ⁇ -producing cells specific for the peptide represented by SEQ ID NO: 2 induced by administration of the cocktail vaccine containing the helper peptide (SEQ ID NO: 243) is represented by the formula (5). More than the number of peptide-specific IFN ⁇ producing cells induced by administration of a single compound.
- the cocktail vaccine in which the compound represented by the formula (5) and the peptide represented by SEQ ID NO: 243 are mixed can induce CTL specific to the peptide represented by SEQ ID NO: 2. became.
- the cocktail vaccine was administered as compared to the case where the compound represented by the formula (5) was administered alone, many IFN ⁇ -producing cells specific to the peptide represented by SEQ ID NO: 2 were observed.
- Specific to the peptide represented by SEQ ID NO: 2 by induction of cells reactive to the helper peptide represented by SEQ ID NO: 244 contained in the peptide represented by SEQ ID NO: 243 in the cocktail vaccine It was assumed that the induction of CTL was enhanced. Therefore, it was clarified that the cocktail vaccine containing the compound represented by the formula (5) and the helper peptide can induce CTL strongly in the mouse in comparison with the single administration of the compound represented by the formula (5).
- An example of the preparation of a vaccine containing two WT1 antigen peptides is a cocktail vaccine containing two different peptides as one preparation.
- the problem is the physical properties of the cancer antigen peptide to be mixed.
- Table 60 and Table 66 when two WT1 antigen peptides are cocktailed, two peptides having different solubility, that is, physical properties, are combined into one preparation.
- the conjugate of the present invention is a compound in which two WT1 antigen peptides are linked by a disulfide bond and exhibits a single solubility, that is, a physical property.
- the conjugate of the present invention has a single physical property and has a property of responding to two WT1 antigen peptides as shown in Test Example 2.
- the conjugate of the present invention is a compound capable of causing a response to two WT1 antigen peptides without considering the interaction between the two WT1 antigen peptides, like a cocktail vaccine. It was done.
- Test Example 19 After filtration, evaluation of CTL inducibility in vivo using HLA-A2402 transgenic mice.
- a homodimer of SEQ ID NO: 4 formed via a disulfide bond and a compound represented by formula (5) Dissolve in water for injection to 10 mg / mL.
- the pharmacological activity of each compound is evaluated using HLA-A2402 transgenic mice (C57BL / 6CrHLA-A2402 / K b ) using CTL inducing activity as an index.
- the compound dissolved in water for injection is sterilized by filtration with a low protein binding filter (grade membrane filter for the purpose of sterilization of injections), then incomplete Freund's adjuvant And emulsified.
- the emulsified compound is administered into the ridge skin of HLA-A2402 transgenic mice.
- the mouse is euthanized with CO 2 gas, and then the spleen or groin lymph node is removed to prepare spleen cells or lymph node cells.
- IFN ⁇ ELISPOT assay kit is used for the measurement of IFN ⁇ production.
- ELISPOT plates are treated with anti-mouse IFN ⁇ antibody and blocked on RPMI 1640 medium containing 10% FBS on the day.
- the prepared mouse-derived cells are seeded on a blocked ELISPOT plate.
- the peptide (SEQ ID NO: 4) is dissolved in DMSO to 40 mg / mL, and further diluted to 40 ⁇ g / mL in RPMI 1640 medium containing 10% FBS.
- the diluted peptide (SEQ ID NO: 4) is added to spleen cells or lymph node cells derived from HLA-A2402 transgenic mice at a final concentration of 10 ⁇ g / mL.
- In vitro peptide re-stimulation is applied by culturing cells supplemented with peptides for 16-20 hours at 37 ° C., 5% CO 2 . After removing the supernatant after incubation, the ELISPOT plate is developed according to the attached protocol. The number of spots developed is measured with an ImmunoSpot Analyzer (manufactured by C.T.L.).
- the compound of the present invention is useful as an active ingredient of a cancer vaccine that induces CTL efficiently and is easy to produce.
- This application is based on Japanese Patent Application Nos. 2013-072173 (filing date: March 29, 2013) and 2013-158383 (filing date: July 31, 2013) filed in Japan. All contents are intended to be included herein.
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Abstract
Description
WT1126-134ペプチド:RMFPNAPYL(Arg-Met-Phe-Pro-Asn-Ala-Pro-Tyr-Leu)(配列番号:2)、
WT1235-243ペプチド:CMTWNQMNL(Cys-Met-Thr-Trp-Asn-Gln-Met-Asn-Leu)(配列番号:3)、
WT110-18ペプチド:ALLPAVPSL(Ala-Leu-Leu-Pro-Ala-Val-Pro-Ser-Leu)(配列番号:5)、
WT1187-195ペプチド:SLGEQQYSV(Ser-Leu-Gly-Glu-Gln-Gln-Tyr-Ser-Val)(配列番号:6)、
WT1302-310ペプチド:RVPGVAPTL(Arg-Val-Pro-Gly-Val-Ala-Pro-Thr-Leu)(配列番号:7)など。
WT1332-347ペプチド:KRYFKLSHLQMHSRKH(Lys-Arg-Tyr-Phe-Lys-Leu-Ser-His-Leu-Gln-Met-His-Ser-Arg-Lys-His)(配列番号:8)、
WT1328-349ペプチド:PGCNKRYFKLSHLQMHSRKHTG(Pro-Gly-Cys-Asn-Lys-Arg-Tyr-Phe-Lys-Leu-Ser-His-Leu-Gln-Met-His-Ser-Arg-Lys-His-Thr-Gly)(配列番号:10)、
WT1122-140ペプチド:SGQARMFPNAPYLPSCLES(Ser-Gly-Gln-Ala-Arg-Met-Phe-Pro-Asn-Ala-Pro-Tyr-Leu-Pro-Ser-Cys-Leu-Glu-Ser)(配列番号:11)など。
具体的には、上記課題の解決策を検討する過程で、異なる2つのWT1癌抗原ペプチドを複合化する際に、必要なシステインを、MHCクラスIへの抗原提示に影響することなく、N-末端またはC-末端へ任意の位置へ導入する方法を着想した。更なる検討の結果、WT1癌抗原ペプチドのN末端にシステインを含む0~5個のアミノ酸を導入したペプチドや、当該ペプチドのシステインを介したジスルフィド結合を含むコンジュゲート体を創製した。そして、当該ペプチドやコンジュゲート体が、in vitroおよび/またはin vivoでERAP1によるトリミングを受け易く、その結果癌抗原ペプチドを生成することを、本発明者らが初めて確認し、本発明が完成された。
製造容易で、汎用性に優れ、かつCTLを効率良く誘導する新規な多価WT1抗原ペプチド提示型ペプチド癌ワクチンの開発が望まれていたところ、本発明者らが発明したコンジュゲート体により、CTLが効率よく誘導され、物理化学的性質に優れ、製造が容易で、製造の管理も容易で、汎用性に優れたWT1コンジュゲートワクチンを開発することが可能となった。
癌抗原ペプチドAは、7~30残基のアミノ酸からなるMHCクラスI拘束性WT1ペプチドを表し、癌抗原ペプチドAのN末端アミノ酸のアミノ基が式(1)中のYaと結合し、癌抗原ペプチドAのC末端アミノ酸のカルボニル基が式(1)中の水酸基と結合し、
R1は、水素原子、式(2):
癌抗原ペプチドBは、癌抗原ペプチドAとは配列が異なり且つ7~30残基のアミノ酸からなるMHCクラスI拘束性WT1ペプチドを表し、癌抗原ペプチドBのN末端アミノ酸のアミノ基が式(2)中のYbと結合し、癌抗原ペプチドBのC末端アミノ酸のカルボニル基が式(2)中の水酸基と結合し、
式(2)中のチオエーテル基が、式(1)中のチオエーテル基と結合する。)
で表される基、または癌抗原ペプチドCを表し、
癌抗原ペプチドCは、癌抗原ペプチドAとは配列が異なり且つ1つのシステイン残基を含む7~30残基のアミノ酸からなるMHCクラスI拘束性WT1ペプチドまたは1つのシステイン残基を含む7~30残基のアミノ酸からなるMHCクラスII拘束性WT1ペプチドを表し、癌抗原ペプチドCのシステイン残基のチオエーテル基が式(1)中のチオエーテル基と結合する。
但し、R1が水素原子である場合、式(1)で表される化合物の配列はWT1タンパクの部分配列と同一ではない。]
で表される化合物、またはその薬学上許容される塩;
RMFPNAPYL (配列番号:2)、
CMTWNQMNL (配列番号:3)、
ALLPAVPSL (配列番号:5)、
SLGEQQYSV (配列番号:6)および
RVPGVAPTL (配列番号:7)
の中から選ばれるいずれかのアミノ酸配列を含むペプチドであるか、または配列番号:2、3、5、6および7の中から選ばれるいずれかのアミノ酸配列中にアミノ酸残基の改変を含有する改変アミノ酸配列を含み且つCTL誘導活性を有するペプチドである、項1~6のいずれか一項に記載の化合物、またはその薬学上許容される塩;
RMFPNAPYL (配列番号:2)、
CMTWNQMNL (配列番号:3)、
CYTWNQMNL (配列番号:4)、
ALLPAVPSL (配列番号:5)、
SLGEQQYSV (配列番号:6)および
RVPGVAPTL (配列番号:7)
の中から選ばれるいずれかのアミノ酸配列からなるペプチドである、項1~7のいずれか一項に記載の化合物、またはその薬学上許容される塩;
CRMFPNAPYL (配列番号:13)、
CCMTWNQMNL (配列番号:14)、
CCYTWNQMNL (配列番号:15)、
CALLPAVPSL (配列番号:16)、
CSLGEQQYSV (配列番号:17)および
CRVPGVAPTL (配列番号:18)
の中から選ばれるいずれかのアミノ酸配列からなるペプチドである、項1~9のいずれか一項に記載の化合物、またはその薬学上許容される塩;
RMFPNAPYL (配列番号:2)、
CMTWNQMNL (配列番号:3)、
ALLPAVPSL (配列番号:5)、
SLGEQQYSV (配列番号:6)および
RVPGVAPTL (配列番号:7)
の中から選ばれるいずれかのアミノ酸配列を含むペプチドであるか、または配列番号:2、3、5、6および7の中から選ばれるいずれかのアミノ酸配列中にアミノ酸残基の改変を含有する改変アミノ酸配列を含み且つCTL誘導活性を有するペプチドである、項1~8および11~16のいずれか一項に記載の化合物、またはその薬学上許容される塩;
RMFPNAPYL (配列番号:2)、
CMTWNQMNL (配列番号:3)、
CYTWNQMNL (配列番号:4)、
ALLPAVPSL (配列番号:5)、
SLGEQQYSV (配列番号:6)および
RVPGVAPTL (配列番号:7)
の中から選ばれるいずれかのアミノ酸配列からなるペプチドである、項1~8および11~17のいずれか一項に記載の化合物、またはその薬学上許容される塩;
で表される化合物である、項1~8および11~18のいずれか一項に記載の化合物、またはその薬学上許容される塩;
CMTWNQMNL (配列番号:3)
を含むペプチドであるか、または配列番号:3のアミノ酸配列中にアミノ酸残基の改変を含有する改変アミノ酸配列を含み且つCTL誘導活性を有するペプチドである、項1~8および20~21のいずれか一項に記載の化合物、またはその薬学上許容される塩;
CMTWNQMNL (配列番号:3)および
CYTWNQMNL (配列番号:4)
の中から選ばれるいずれかのアミノ酸配列からなるペプチドである、項1~8および20~22のいずれか一項に記載の化合物、またはその薬学上許容される塩;
で表される化合物、または式(5):
で表される化合物である、項1~8および20~23のいずれか一項に記載の化合物、またはその薬学上許容される塩;
SGQARMFPNAPYLPSC (配列番号:19)、
SGQARMFPNAPYLPSCLES (配列番号:11)、
PGCNKRYFKLSHLQMHSRK (配列番号:20)、
PGCNKRYFKLSHLQMHSRKH (配列番号:21)、
PGCNKRYFKLSHLQMHSRKHTG (配列番号:10)、
CNKRYFKLSHLQMHSRK (配列番号:22)、
CNKRYFKLSHLQMHSRKH (配列番号:23)および
CNKRYFKLSHLQMHSRKHTG (配列番号:24)
の中から選ばれるいずれかのアミノ酸配列を含むペプチドであるか、または配列番号:10~11および19~24の中から選ばれるいずれかのアミノ酸配列中にアミノ酸残基の改変を含有する改変アミノ酸配列を含み且つヘルパーT細胞誘導活性を有するペプチドである、項1~8、20および25のいずれか一項に記載の化合物、またはその薬学上許容される塩;
SGQARMFPNAPYLPSC (配列番号:19)、
SGQAYMFPNAPYLPSC (配列番号:25)、
SGQARMFPNAPYLPSCLES (配列番号:11)、
SGQAYMFPNAPYLPSCLES (配列番号:12)、
PGCNKRYFKLSHLQMHSRK (配列番号:20)、
PGCNKRYFKLSHLQMHSRKH (配列番号:21)、
PGCNKRYFKLSHLQMHSRKHTG (配列番号:10)、
CNKRYFKLSHLQMHSRK (配列番号:22)、
CNKRYFKLSHLQMHSRKH (配列番号:23)および
CNKRYFKLSHLQMHSRKHTG (配列番号:24)
の中から選ばれるいずれかのアミノ酸配列からなるペプチドである、項1~8、20および25~26のいずれか一項に記載の化合物、またはその薬学上許容される塩;
で表される化合物、式(7):
で表される化合物、式(8):
で表される化合物または式(9):
で表される化合物である、項1~8、20および25~27のいずれか一項に記載の化合物、またはその薬学上許容される塩;
癌抗原ペプチドAは、7~30残基のアミノ酸からなるMHCクラスI拘束性WT1ペプチドを表し、癌抗原ペプチドAのN末端アミノ酸のアミノ基が式(1)中のYaと結合し、癌抗原ペプチドAのC末端アミノ酸のカルボニル基が式(1)中の水酸基と結合し、
R1は、水素原子、式(2):
癌抗原ペプチドBは、癌抗原ペプチドAとは配列が異なり且つ7~30残基のアミノ酸からなるMHCクラスI拘束性WT1ペプチドを表し、癌抗原ペプチドBのN末端アミノ酸のアミノ基が式(2)中のYbと結合し、癌抗原ペプチドBのC末端アミノ酸のカルボニル基が式(2)中の水酸基と結合し、
式(2)中のチオエーテル基が、式(1)中のチオエーテル基と結合する。)
で表される基、または癌抗原ペプチドCを表し、
癌抗原ペプチドCは、癌抗原ペプチドAとは配列が異なり且つ1つのシステイン残基を含む7~30残基のアミノ酸からなるMHCクラスI拘束性WT1ペプチドまたは1つのシステイン残基を含む7~30残基のアミノ酸からなるMHCクラスII拘束性WT1ペプチドを表し、癌抗原ペプチドCのシステイン残基のチオエーテル基が式(1)中のチオエーテル基と結合する。
但し、R1が水素原子である場合、式(1)で表される化合物の配列はWT1タンパクの部分配列と同一ではない。]
で表される化合物、またはその薬学上許容される塩;
RMFPNAPYL (配列番号:2)、
CMTWNQMNL (配列番号:3)、
ALLPAVPSL (配列番号:5)、
SLGEQQYSV (配列番号:6)および
RVPGVAPTL (配列番号:7)
の中から選ばれるいずれかのアミノ酸配列を含むペプチドであるか、または配列番号:2、3、5、6および7の中から選ばれるいずれかのアミノ酸配列中にアミノ酸残基の改変を含有する改変アミノ酸配列を含み且つCTL誘導活性を有するペプチドである、項1~6のいずれか一項に記載の化合物、またはその薬学上許容される塩;
RMFPNAPYL (配列番号:2)、
CMTWNQMNL (配列番号:3)、
CYTWNQMNL (配列番号:4)、
ALLPAVPSL (配列番号:5)、
SLGEQQYSV (配列番号:6)および
RVPGVAPTL (配列番号:7)
の中から選ばれるいずれかのアミノ酸配列からなるペプチドである、項1~7のいずれか一項に記載の化合物、またはその薬学上許容される塩;
CRMFPNAPYL (配列番号:13)、
CCMTWNQMNL (配列番号:14)、
CCYTWNQMNL (配列番号:15)、
CALLPAVPSL (配列番号:16)、
CSLGEQQYSV (配列番号:17)および
CRVPGVAPTL (配列番号:18)
の中から選ばれるいずれかのアミノ酸配列からなるペプチドである、項1~9のいずれか一項に記載の化合物、またはその薬学上許容される塩;
RMFPNAPYL (配列番号:2)、
CMTWNQMNL (配列番号:3)、
ALLPAVPSL (配列番号:5)、
SLGEQQYSV (配列番号:6)および
RVPGVAPTL (配列番号:7)
の中から選ばれるいずれかのアミノ酸配列を含むペプチドであるか、または配列番号:2、3、5、6および7の中から選ばれるいずれかのアミノ酸配列中にアミノ酸残基の改変を含有する改変アミノ酸配列を含み且つCTL誘導活性を有するペプチドである、項1~8および11~16のいずれか一項に記載の化合物、またはその薬学上許容される塩;
RMFPNAPYL (配列番号:2)、
CMTWNQMNL (配列番号:3)、
CYTWNQMNL (配列番号:4)、
ALLPAVPSL (配列番号:5)、
SLGEQQYSV (配列番号:6)および
RVPGVAPTL (配列番号:7)
の中から選ばれるいずれかのアミノ酸配列からなるペプチドである、項1~8および11~17のいずれか一項に記載の化合物、またはその薬学上許容される塩;
で表される化合物である、項1~8および11~18のいずれか一項に記載の化合物、またはその薬学上許容される塩;
癌抗原ペプチドDは、7~30残基のアミノ酸からなるMHCクラスII拘束性WT1ペプチドを表し、癌抗原ペプチドDのN末端アミノ酸のアミノ基が式(16)中のYdと結合し、癌抗原ペプチドDのC末端アミノ酸のカルボニル基が式(16)中の水酸基と結合する。)
中のチオエーテル基と結合している、または1つのシステイン残基を含む7~30残基のアミノ酸からなるMHCクラスII拘束性WT1ペプチドである癌抗原ペプチドEのシステイン残基のチオエーテル基と結合している、項1~8、11~13および20のいずれか一項に記載の化合物、またはその薬学上許容される塩;
CMTWNQMNL (配列番号:3)および
CYTWNQMNL (配列番号:4)
の中から選ばれるいずれかのアミノ酸配列からなるペプチドである、項21~22のいずれか一項に記載の化合物、またはその薬学上許容される塩;
SGQARMFPNAPYLPSC (配列番号:19)、
SGQAYMFPNAPYLPSC (配列番号:25)、
SGQARMFPNAPYLPSCLES (配列番号:11)、
SGQAYMFPNAPYLPSCLES (配列番号:12)、
PGCNKRYFKLSHLQMHSRK (配列番号:20)、
PGCNKRYFKLSHLQMHSRKH (配列番号:21)、
PGCNKRYFKLSHLQMHSRKHTG (配列番号:10)、
CNKRYFKLSHLQMHSRK (配列番号:22)、
CNKRYFKLSHLQMHSRKH (配列番号:23)、
CNKRYFKLSHLQMHSRKHTG (配列番号:24)および
WAPVLDFAPPGASAYGSL (配列番号:244)
の中から選ばれるいずれかのアミノ酸配列からなるペプチドである、項21~28のいずれか一項に記載の化合物、またはその薬学上許容される塩;
で表される化合物である、項1~8、11~13および20~29のいずれか一項に記載の化合物、またはその薬学上許容される塩;
SGQARMFPNAPYLPSC (配列番号:19)、
SGQAYMFPNAPYLPSC (配列番号:25)、
SGQARMFPNAPYLPSCLES (配列番号:11)、
SGQAYMFPNAPYLPSCLES (配列番号:12)、
PGCNKRYFKLSHLQMHSRK (配列番号:20)、
PGCNKRYFKLSHLQMHSRKH (配列番号:21)、
PGCNKRYFKLSHLQMHSRKHTG (配列番号:10)、
CNKRYFKLSHLQMHSRK (配列番号:22)、
CNKRYFKLSHLQMHSRKH (配列番号:23)および
CNKRYFKLSHLQMHSRKHTG (配列番号:24)
の中から選ばれるいずれかのアミノ酸配列からなるペプチドである、項21~23および31のいずれか一項に記載の化合物、またはその薬学上許容される塩;
CMTWNQMNL (配列番号:3)
を含むペプチドであるか、または配列番号:3のアミノ酸配列中にアミノ酸残基の改変を含有する改変アミノ酸配列を含み且つCTL誘導活性を有するペプチドである、項1~8および33~34のいずれか一項に記載の化合物、またはその薬学上許容される塩;
CMTWNQMNL (配列番号:3)および
CYTWNQMNL (配列番号:4)
の中から選ばれるいずれかのアミノ酸配列からなるペプチドである、項1~8および33~35のいずれか一項に記載の化合物、またはその薬学上許容される塩;
で表される化合物、または式(5):
で表される化合物である、項1~8および33~36のいずれか一項に記載の化合物、またはその薬学上許容される塩;
癌抗原ペプチドDは、7~30残基のアミノ酸からなるMHCクラスII拘束性WT1ペプチドを表し、癌抗原ペプチドDのN末端アミノ酸のアミノ基が式(16)中のYdと結合し、癌抗原ペプチドDのC末端アミノ酸のカルボニル基が式(16)中の水酸基と結合する。)
中のチオエーテル基と結合している、または1つのシステイン残基を含む7~30残基のアミノ酸からなるMHCクラスII拘束性WT1ペプチドである癌抗原ペプチドEのシステイン残基のチオエーテル基と結合している、項1~8および33のいずれか一項に記載の化合物、またはその薬学上許容される塩;
CMTWNQMNL (配列番号:3)および
CYTWNQMNL (配列番号:4)
の中から選ばれるいずれかのアミノ酸配列からなるペプチドである、項38~40のいずれか一項に記載の化合物、またはその薬学上許容される塩;
SGQARMFPNAPYLPSC (配列番号:19)、
SGQAYMFPNAPYLPSC (配列番号:25)、
SGQARMFPNAPYLPSCLES (配列番号:11)、
SGQAYMFPNAPYLPSCLES (配列番号:12)、
PGCNKRYFKLSHLQMHSRK (配列番号:20)、
PGCNKRYFKLSHLQMHSRKH (配列番号:21)、
PGCNKRYFKLSHLQMHSRKHTG (配列番号:10)、
CNKRYFKLSHLQMHSRK (配列番号:22)、
CNKRYFKLSHLQMHSRKH (配列番号:23)、
CNKRYFKLSHLQMHSRKHTG (配列番号:24)および
WAPVLDFAPPGASAYGSL (配列番号:244)
の中から選ばれるいずれかのアミノ酸配列からなるペプチドである、項38~46のいずれか一項に記載の化合物、またはその薬学上許容される塩;
で表される化合物である、項38~47のいずれか一項に記載の化合物、またはその薬学上許容される塩;
SGQARMFPNAPYLPSC (配列番号:19)、
SGQAYMFPNAPYLPSC (配列番号:25)、
SGQARMFPNAPYLPSCLES (配列番号:11)、
SGQAYMFPNAPYLPSCLES (配列番号:12)、
PGCNKRYFKLSHLQMHSRK (配列番号:20)、
PGCNKRYFKLSHLQMHSRKH (配列番号:21)、
PGCNKRYFKLSHLQMHSRKHTG (配列番号:10)、
CNKRYFKLSHLQMHSRK (配列番号:22)、
CNKRYFKLSHLQMHSRKH (配列番号:23)および
CNKRYFKLSHLQMHSRKHTG (配列番号:24)
の中から選ばれるいずれかのアミノ酸配列からなるペプチドである、項38~41および44のいずれか一項に記載の化合物、またはその薬学上許容される塩;
で表される化合物である、項38~41および49のいずれか一項に記載の化合物、またはその薬学上許容される塩;
SGQARMFPNAPYLPSC (配列番号:19)、
SGQARMFPNAPYLPSCLES (配列番号:11)、
PGCNKRYFKLSHLQMHSRK (配列番号:20)、
PGCNKRYFKLSHLQMHSRKH (配列番号:21)、
PGCNKRYFKLSHLQMHSRKHTG (配列番号:10)、
CNKRYFKLSHLQMHSRK (配列番号:22)、
CNKRYFKLSHLQMHSRKH (配列番号:23)および
CNKRYFKLSHLQMHSRKHTG (配列番号:24)
の中から選ばれるいずれかのアミノ酸配列を含むペプチドであるか、または配列番号:10~11および19~24の中から選ばれるいずれかのアミノ酸配列中にアミノ酸残基の改変を含有する改変アミノ酸配列を含み且つヘルパーT細胞誘導活性を有するペプチドである、項1~8、33および51のいずれか一項に記載の化合物、またはその薬学上許容される塩;
SGQARMFPNAPYLPSC (配列番号:19)、
SGQAYMFPNAPYLPSC (配列番号:25)、
SGQARMFPNAPYLPSCLES (配列番号:11)、
SGQAYMFPNAPYLPSCLES (配列番号:12)、
PGCNKRYFKLSHLQMHSRK (配列番号:20)、
PGCNKRYFKLSHLQMHSRKH (配列番号:21)、
PGCNKRYFKLSHLQMHSRKHTG (配列番号:10)、
CNKRYFKLSHLQMHSRK (配列番号:22)、
CNKRYFKLSHLQMHSRKH (配列番号:23)および
CNKRYFKLSHLQMHSRKHTG (配列番号:24)
の中から選ばれるいずれかのアミノ酸配列からなるペプチドである、項1~8、33および51~52のいずれか一項に記載の化合物、またはその薬学上許容される塩;
で表される化合物、式(7):
で表される化合物、式(8):
で表される化合物または式(9):
で表される化合物である、項1~8、33および51~53のいずれか一項に記載の化合物、またはその薬学上許容される塩;
CWAPVLDFAPPGASAYGSL (配列番号:242)および
WAPVLDFAPPGASAYGSLC (配列番号:243)
である、項55に記載の改変体;
で表される化合物、またはその薬学上許容される塩;
で表される化合物、式(4):
で表される化合物、および式(5):
で表される化合物からなる群から選択される化合物と以下のアミノ酸配列:
CNKRYFKLSHLQMHSRK (配列番号:22)、
CNKRYFKLSHLQMHSRKH (配列番号:23)、
CNKRYFKLSHLQMHSRKHTG (配列番号:24)、
WAPVLDFAPPGASAYGSL (配列番号:244)、
CWAPVLDFAPPGASAYGSL (配列番号:242)および
WAPVLDFAPPGASAYGSLC (配列番号:243)、
からなる群から選択されるアミノ酸配列からなるペプチドを含む組成物;
(1)Fmoc-C(Mmt)A-SBnおよび癌抗原ペプチドCを用いて、C(Mmt)AのC末端アミノ酸のカルボニル基と癌抗原ペプチドCのN末端アミノ基が結合したペプチドを合成する工程であって、抗原ペプチドCは、1つのシステイン残基を含む7~30残基のアミノ酸からなるMHCクラスI拘束性WT1ペプチドまたは1つのシステイン残基を含む7~30残基のアミノ酸からなるMHCクラスII拘束性WT1ペプチドを表す工程、
(2)前記工程(1)で得られたペプチドおよびNpys基で保護された1つのシステイン残基がN末端に結合している癌抗原ペプチドAを用いて、前記工程(1)で得られたペプチド中の癌抗原ペプチドCのシステイン残基のチオエーテル基と癌抗原ペプチドAのN末端に結合しているシステイン残基のチオエーテル基が結合したペプチドを合成する工程であって、癌抗原ペプチドAは、7~30残基のアミノ酸からなるMHCクラスI拘束性WT1ペプチドを表す工程、および
(3)前記工程(2)で得られたペプチドおよびSPy基で保護されたシステイン残基を含む癌抗原ペプチドDを用いて、前記工程(2)で得られたペプチド中の癌抗原ペプチドAのN末端に結合しているシステイン残基のチオエーテル基と癌抗原ペプチドDのシステイン残基のチオエーテル基が結合したペプチドを合成する工程であって、癌抗原ペプチドDは、1つのシステイン残基がN末端に結合している7~30残基のアミノ酸からなるMHCクラスII拘束性WT1ペプチドまたは1つのシステイン残基を含む7~30残基のアミノ酸からなるMHCクラスII拘束性WT1ペプチドを表す工程、
癌抗原ペプチドAは、以下のアミノ酸配列:
RMFPNAPYL (配列番号:2)、
ALLPAVPSL (配列番号:5)、
SLGEQQYSV (配列番号:6)および
RVPGVAPTL (配列番号:7)
の中から選ばれるいずれかのアミノ酸配列からなるペプチドを表し、癌抗原ペプチドAのN末端アミノ酸のアミノ基が式(1)中のYaと結合し、癌抗原ペプチドAのC末端アミノ酸のカルボニル基が式(1)中の水酸基と結合し、
R1は、癌抗原ペプチドCを表し、
癌抗原ペプチドCは、癌抗原ペプチドAとは配列が異なり且つ以下のアミノ酸配列:
CMTWNQMNL (配列番号:3)および
CYTWNQMNL (配列番号:4)
の中から選ばれるいずれかのアミノ酸配列からなるペプチドを表し、癌抗原ペプチドCのシステイン残基のチオエーテル基が式(1)中のチオエーテル基と結合する。]
で表される化合物、またはその薬学上許容される塩;
で表される化合物である、項1に記載の化合物、またはその薬学上許容される塩;
で表される化合物である、項1に記載の化合物、またはその薬学上許容される塩;
以下のアミノ酸配列:
CNKRYFKLSHLQMHSRK (配列番号:22)、
CNKRYFKLSHLQMHSRKH (配列番号:23)、
CNKRYFKLSHLQMHSRKHTG (配列番号:24)、
WAPVLDFAPPGASAYGSL (配列番号:244)、
CWAPVLDFAPPGASAYGSL (配列番号:242)および
WAPVLDFAPPGASAYGSLC (配列番号:243)、
からなる群から選択されるアミノ酸配列からなるペプチドを一つ以上含む組成物;および
で表される化合物からなる群から選択される化合物と、
以下のアミノ酸配列:
CNKRYFKLSHLQMHSRK (配列番号:22)、
CNKRYFKLSHLQMHSRKH (配列番号:23)、
CNKRYFKLSHLQMHSRKHTG (配列番号:24)、
WAPVLDFAPPGASAYGSL (配列番号:244)、
CWAPVLDFAPPGASAYGSL (配列番号:242)および
WAPVLDFAPPGASAYGSLC (配列番号:243)、
からなる群から選択されるアミノ酸配列からなるペプチドを一つ以上含む組成物、
に関する。
中でも、配列の異なる2つのMHCクラスI拘束性WT1ペプチドのHLAのサブタイプに関し、A02タイプ(A-0201、A0206など)のペプチドとA24タイプ(A-2402など)のペプチドと組み合わせ得られる本発明の化合物(コンジュゲート体)が、特に好ましい。欧米人(Caucasian)においては、HLA-A0201タイプまたはHLA-A0206タイプであるPopulationが約47%と最も多く、次いでHLA-A2402タイプが約13%であり、これらのタイプの総和は、重複(すなわち両方のタイプを有するヒトを二重に計算すること)を除くと約56%を占める(Human Immunol. 62:1009;2001)。一方日本人などにおいては、HLA-A2402であるPopulationが約60%と最も多く、次いでHLA-A0201またはHLA-A0206が約39%であり、これらのタイプの総和は、重複(すなわち両方のタイプを有するヒトを二重に計算すること)を除くと約81%を占める(www.bmdc.irc.or.jp/GF-A.htm)。従って、本発明の化合物の利点としては、具体的には、より大きなPopulationを一つの本発明の化合物でカバーするという利点、および必ずしも投与の事前に患者のHLAのサブタイプを選別することが必須ではなくなり得るという利点などが挙げられる。本発明の化合物のこのような利点の観点で、式(3)、式(4)または式(5)で表される化合物が好ましく、式(5)で表される化合物がより好ましい。
また、本発明の化合物により、物理化学的性質や安定性に優れ、製造やその制御が容易な癌ワクチンの有効成分を提供することが可能となった。これにより、癌ワクチンの製剤化も容易となった。
具体的には、物理化学的性質としては、溶解度、溶液の粘度、これに伴う精製の容易さ、凍結乾燥後の取り扱い易さ、これに伴う精製の容易さなどが挙げられる。安定性として、塩置換した後の安定性、吸湿性、熱安定性、エマルション形成後の安定性などが挙げられる。さらに薬理活性としては、癌ワクチンとしての薬効、API(Active Pharmaceutical Ingredient、医薬品有効成分)によって生じる違い、製剤中の添加剤との相互作用などが挙げられる。このうちAPIによって生じる違いとは、APIによる癌ワクチンとしての違いであり、具体的には、溶解度が大きく異なる2つのAPIにおいては、溶解度が小さいAPIの場合析出し易く、医薬品には必須要件であるメンブランフィルターの濾過による滅菌処理ができなくなる可能性が十分予想される。または、辛うじて溶解度が小さいAPIの濾過による滅菌処理を行っても、濾液に含まれるAPIの量が大きく減少し、癌ワクチンとして必須のCTL誘導能も著しく低下すると考えられる。よって、溶解度が小さいAPIでは、生産上の効率が著しく低下するというデメリットが容易に予想される。
AlaまたはA:アラニン残基
ArgまたはR:アルギニン残基
AsnまたはN:アスパラギン残基
AspまたはD:アスパラギン酸残基
CysまたはC:システイン残基
GlnまたはQ:グルタミン残基
GluまたはE:グルタミン酸残基
GlyまたはG:グリシン残基
HisまたはH:ヒスチジン残基
IleまたはI:イソロイシン残基
LeuまたはL:ロイシン残基
LysまたはK:リジン残基
MetまたはM:メチオニン残基
PheまたはF:フェニルアラニン残基
ProまたはP:プロリン残基
SerまたはS:セリン残基
ThrまたはT:スレオニン残基
TrpまたはW:トリプトファン残基
TyrまたはY:チロシン残基
ValまたはV:バリン残基
Abu:2-アミノ酪酸残基(α-アミノ酪酸残基とも言う)
Orn:オルニチン残基
Cit:シトルリン残基
本発明の化合物において、たとえば式(3)~(9)で表される化合物において、その部分構造にあたるペプチドについても、特に断りの無い限り、N末端アミノ酸のアミノ酸残基のアミノ基は水素原子と結合し、C末端アミノ酸のアミノ酸残基のカルボニル基は水酸基と結合している。
当該和の整数として、好ましくは0~2が挙げられ、より好ましくは0~1が挙げられ、最も好ましくは0が挙げられる。すなわち、XaおよびYaとしては、共に単結合である場合が最も好ましい。
当該和の整数が2である場合としては、Xaが2残基のアミノ酸からなるペプチドの二価基であり且つYaが単結合である場合、XaおよびYaが独立して1残基のアミノ酸からなるペプチドの二価基である場合、またはXaが単結合であり且つYaが2残基のアミノ酸からなるペプチドの二価基である場合が挙げられる。
当該和の整数が1である場合としては、Xaが1残基のアミノ酸からなるペプチドの二価基であり且つYaが単結合である場合、またはXaが単結合であり且つYaが1残基のアミノ酸からなるペプチドの二価基である場合が挙げられる。このうち好ましくは、Xaが単結合であり且つYaがアラニン残基、ロイシン残基またはメチオニン残基である場合が挙げられる。
HLAの各サブタイプについて、多型(対立遺伝子)が知られている。HLA-Aの多型としては、HLA-A1、HLA-A0201、HLA-A24などの27種以上が挙げられ、HLA-Bの多型としては、HLA-B7、HLA-B40、HLA-B4403などの59種以上が挙げられ、HLA-Cwの多型としては、HLA-Cw0301、HLA-Cw0401、HLA-Cw0602などの10種以上が挙げられる。これら多型の中、好ましくは、HLA-A0201やHLA-A24が挙げられる。
RMFPNAPYL (配列番号:2)、
CMTWNQMNL (配列番号:3)、
ALLPAVPSL (配列番号:5)、
SLGEQQYSV (配列番号:6)および
RVPGVAPTL (配列番号:7)
の中から選ばれるいずれかのアミノ酸配列を含むペプチド、または配列番号:2、3、5、6および7の中から選ばれるいずれかのアミノ酸配列中にアミノ酸残基の改変を含有する改変アミノ酸配列を含み且つCTL誘導活性を有するペプチドが挙げられる。さらに好ましくは、配列番号:2、3、5、6および7の中から選ばれるいずれかのアミノ酸配列からなるペプチドが挙げられる。
RMFPNAPYL (配列番号:2)の改変キラーペプチドである
RYFPNAPYL (配列番号:223)(国際公開03/106682号参照);
FMFPNAPYL (配列番号:224)、
RLFPNAPYL (配列番号:225)、
RMMPNAPYL (配列番号:226)、
RMFPNAPYV (配列番号:227)もしくは
YMFPNAPYL (配列番号:228)(国際公開第2009/072610号参照);
CYTWNQMNL (配列番号:4)(国際公開第02/79253号参照);
Xaa-Met-Thr-Trp-Asn-Gln-Met-Asn-Leu (配列番号:229)
(本配列中XaaはSerまたはAlaを表す)もしくは
Xaa-Tyr-Thr-Trp-Asn-Gln-Met-Asn-Leu (配列番号:230)
(本配列中XaaはSer、Ala、Abu、Arg、Lys、Orn、Cit、Leu、PheまたはAsnを表す)(国際公開2004/026897号参照);
AYLPAVPSL (配列番号:231)(国際公開第2003/106682号参照);
FLGEQQYSV (配列番号:232)、
SMGEQQYSV (配列番号:233)もしくは
SLMEQQYSV (配列番号:234)(国際公開第2009/072610号参照);または
RYPGVAPTL (配列番号:235)(国際公開第2003/106682号参照)。
で表される化合物すなわちペプチドである。
すなわち、R1が水素原子である式(1)の化合物は、配列番号:1に記載のヒトのWT1のアミノ酸配列において連続する8~35残基のアミノ酸からなる部分ペプチドではない。癌抗原ペプチドAがWT1138-146ペプチドである場合を例に挙げて、具体的に説明する。WT1138-146ペプチドは、そのアミノ酸配列がLESQPAIRN(配列番号:78)であり、配列番号:1に記載のヒトのWT1のアミノ酸配列における138位~146位の連続する9残基のアミノ酸からなる部分ペプチドである。配列番号:1においては、WT1138-146ペプチドのN末端側に連続する137位はCである。よって、WT1137-146ペプチド(CLESQPAIRN)(配列番号:236)は、配列番号:1に記載のヒトのWT1のアミノ酸配列において連続する10残基のアミノ酸からなる部分ペプチドに該当する。一方、本願発明の要件「R1が水素原子である式(1)の化合物は、配列番号:1に記載のヒトのWT1のアミノ酸配列において連続する8~35残基のアミノ酸からなる部分ペプチドではない」に基づき、R1が水素原子である式(1)の化合物において、癌抗原ペプチドAがWT1138-146ペプチド(LESQPAIRN)(配列番号:78)である場合には、WT1137-146ペプチド(CLESQPAIRN)(配列番号:236)は本願発明の化合物から除かれることから、XaおよびYaが同時に単結合になることはない。
CRMFPNAPYL (配列番号:13)、
CCMTWNQMNL (配列番号:14)、
CCYTWNQMNL (配列番号:15)、
CALLPAVPSL (配列番号:16)、
CSLGEQQYSV (配列番号:17)および
CRVPGVAPTL (配列番号:18)
の中から選ばれるいずれかのアミノ酸配列からなるペプチドが好ましい。
当該和の整数として、好ましくは0~2が挙げられ、より好ましくは0~1が挙げられ、最も好ましくは0が挙げられる。すなわち、XbおよびYbとしては、共に単結合である場合が最も好ましい。
当該和の整数が2である場合としては、Xbが2残基のアミノ酸からなるペプチドの二価基であり且つYbが単結合である場合、XbおよびYbが独立して1残基のアミノ酸からなるペプチドの二価基である場合、またはXbが単結合であり且つYbが2残基のアミノ酸からなるペプチドの二価基である場合が挙げられる。
当該和の整数が1である場合としては、Xbが1残基のアミノ酸からなるペプチドの二価基であり且つYbが単結合である場合、またはXbが単結合であり且つYbが1残基のアミノ酸からなるペプチドの二価基である場合が挙げられる。このうち好ましくは、Xbが単結合であり且つYbがアラニン残基、ロイシン残基またはメチオニン残基である場合が挙げられる。
癌抗原ペプチドAと癌抗原ペプチドBが同時に同じペプチドであることはないことから、R1が前記の式(2)で表される基である式(1)の化合物は、仮にXaおよびXbが同じで且つYaおよびYbが同じであっても、ホモダイマーではなく、ヘテロダイマーである。ホモダイマーは、同じペプチド単量体が二量体化された二量体を意味し、ヘテロダイマーは、異なるペプチド単量体が二量体化された二量体を意味する。
で表される化合物が挙げられる。
当該和の整数として、好ましくは0~2が挙げられ、より好ましくは0~1が挙げられ、最も好ましくは0が挙げられる。すなわち、XdおよびYdとしては、共に単結合である場合が最も好ましい。
当該和の整数が2である場合としては、Xdが2残基のアミノ酸からなるペプチドの二価基であり且つYbが単結合である場合、XdおよびYdが独立して1残基のアミノ酸からなるペプチドの二価基である場合、またはXdが単結合であり且つYdが2残基のアミノ酸からなるペプチドの二価基である場合が挙げられる。
当該和の整数が1である場合としては、Xdが1残基のアミノ酸からなるペプチドの二価基であり且つYdが単結合である場合、またはXdが単結合であり且つYdが1残基のアミノ酸からなるペプチドの二価基である場合が挙げられる。このうち好ましくは、Xdが単結合であり且つYdがアラニン残基、ロイシン残基またはメチオニン残基である場合が挙げられる。
SGQARMFPNAPYLPSC (配列番号:19)、
SGQAYMFPNAPYLPSC (配列番号:25)、
SGQARMFPNAPYLPSCLES (配列番号:11)、
SGQAYMFPNAPYLPSCLES (配列番号:12)、
PGCNKRYFKLSHLQMHSRK (配列番号:20)、
PGCNKRYFKLSHLQMHSRKH (配列番号:21)、
PGCNKRYFKLSHLQMHSRKHTG (配列番号:10)、
CNKRYFKLSHLQMHSRK (配列番号:22)、
CNKRYFKLSHLQMHSRKH (配列番号:23)、
CNKRYFKLSHLQMHSRKHTG (配列番号:24)および
WAPVLDFAPPGASAYGSL (配列番号:244)
の中から選ばれるいずれかのアミノ酸配列からなるペプチドが挙げられる。
で表される化合物が挙げられる。
SGQARMFPNAPYLPSC (配列番号:19)、
SGQAYMFPNAPYLPSC (配列番号:25)、
SGQARMFPNAPYLPSCLES (配列番号:11)、
SGQAYMFPNAPYLPSCLES (配列番号:12)、
PGCNKRYFKLSHLQMHSRK (配列番号:20)、
PGCNKRYFKLSHLQMHSRKH (配列番号:21)、
PGCNKRYFKLSHLQMHSRKHTG (配列番号:10)、
CNKRYFKLSHLQMHSRK (配列番号:22)、
CNKRYFKLSHLQMHSRKH (配列番号:23)および
CNKRYFKLSHLQMHSRKHTG (配列番号:24)
の中から選ばれるいずれかのアミノ酸配列からなるペプチドが挙げられる。
癌抗原ペプチドCは、1つのシステイン残基を含む7~30残基のアミノ酸からなるMHCクラスI拘束性WT1ペプチドまたは1つのシステイン残基を含む7~30残基のアミノ酸からなるMHCクラスII拘束性WT1ペプチドを表す。
CMTWNQMNL (配列番号:3)
を含むペプチド、または配列番号:3のアミノ酸配列中にアミノ酸残基の改変を含有する改変アミノ酸配列を含み且つCTL誘導活性を有するペプチドが挙げられる。当該「アミノ酸配列を含む」および「アミノ酸配列中にアミノ酸残基の改変を含有する改変アミノ酸配列を含み且つCTL誘導活性を有するペプチド」は、前記と同義である。最も好ましくは、以下のアミノ酸配列:
CMTWNQMNL (配列番号:3)および
CYTWNQMNL (配列番号:4)
の中から選ばれるいずれかのアミノ酸配列からなるペプチドが挙げられる。
で表される化合物、または式(5):
で表される化合物が挙げられる。このうち、式(5)で表される化合物がより好ましい。
で表される化合物が挙げられる。
で表される化合物が挙げられる。
SGQARMFPNAPYLPSCLES (配列番号:11)および
PGCNKRYFKLSHLQMHSRKHTG (配列番号:10)、
の中から選ばれるいずれかのアミノ酸配列を含むペプチド、または配列番号:10~11の中から選ばれるいずれかのアミノ酸配列中にアミノ酸残基の改変を含有する改変アミノ酸配列を含み且つヘルパーT細胞誘導活性を有するペプチドが挙げられる。
SGQARMFPNAPYLPSCLES (配列番号:11)の改変ヘルパーペプチドである
SGQAYMFPNAPYLPSCLES (配列番号:12)(特許文献6参照)、
SGQARMFPNAPYLPSC (配列番号:19)もしくは
SGQAYMFPNAPYLPSC (配列番号:25);または
PGCNKRYFKLSHLQMHSRK (配列番号:20)、
PGCNKRYFKLSHLQMHSRKH (配列番号:21)、
CNKRYFKLSHLQMHSRK (配列番号:22)、
CNKRYFKLSHLQMHSRKH (配列番号:23)もしくは
CNKRYFKLSHLQMHSRKHTG (配列番号:24)。
SGQARMFPNAPYLPSC (配列番号:19)、
SGQAYMFPNAPYLPSC (配列番号:25)、
SGQARMFPNAPYLPSCLES (配列番号:11)、
SGQAYMFPNAPYLPSCLES (配列番号:12)、
PGCNKRYFKLSHLQMHSRK (配列番号:20)、
PGCNKRYFKLSHLQMHSRKH (配列番号:21)、
PGCNKRYFKLSHLQMHSRKHTG (配列番号:10)、
CNKRYFKLSHLQMHSRK (配列番号:22)、
CNKRYFKLSHLQMHSRKH (配列番号:23)および
CNKRYFKLSHLQMHSRKHTG (配列番号:24)
の中から選ばれるいずれかのアミノ酸配列からなるペプチドが挙げられる。
で表される化合物、式(7):
で表される化合物、式(8):
で表される化合物、または式(9):
で表される化合物が挙げられる。
で表される化合物、式(4):
で表される化合物、および式(5):
で表される化合物が挙げられる。
CNKRYFKLSHLQMHSRK (配列番号:22)、
CNKRYFKLSHLQMHSRKH (配列番号:23)、
CNKRYFKLSHLQMHSRKHTG (配列番号:24)、
WAPVLDFAPPGASAYGSL (配列番号:244)、
CWAPVLDFAPPGASAYGSL (配列番号:242)および
WAPVLDFAPPGASAYGSLC (配列番号:243)
が挙げられる。
例えば、Fmoc法もしくはBoc法を用いて固相合成機で製造する方法や、Boc-アミノ酸もしくはZ-アミノ酸を液相合成法で逐次縮合させて製造する方法が挙げられる(Fmocは9-フルオレニルメトキシカルボニル基、Bocはt-ブトキシカルボニル基、Zはベンジルオキシカルボニル基をそれぞれ表わす)。
本発明の化合物を製造するための中間体において、アミノ基、カルボキシ基、メルカプト基などの官能基は、必要に応じて保護、脱保護の技術を用い、適当な保護基で保護し、また脱保護することができる。好適な保護基、保護する方法、および脱保護する方法としては、「Protective Groups in Organic Synthesis 2nd Edition (John Wiley & Sons, Inc.;1990)」などに詳細に記載されている。たとえば、メルカプト基の保護基としてはアセトアミドメチル基またはトリチル基などが挙げられる。
ジスルフィド化合物の精製方法は、文献(ペプタイド・シンセシス(Peptide Synthesis),Interscience,New York,1966;ザ・プロテインズ(The Proteins),Vol 2,Academic Press Inc.,New York,1976;ペプチド合成,丸善(株),1975;ペプチド合成の基礎と実験、丸善(株),1985;医薬品の開発 続 第14巻・ペプチド合成,広川書店,1991)などに記載されている。中でも、HPLCが好ましい。
本発明の化合物は、その物理化学的性質においても、医薬品原薬として大量製造可能な性質を有する。具体的には、溶解性が高い、溶液中安定性に優れている、または濃縮された際にゲル化しにくいなどの性質を有し、逆相HPLCなどのカラムクロマトグラフィーによる精製工程で、大量スケールにおいても容易に高純度の化合物を原薬として製造することができる。
本発明の化合物は、癌免疫療法におけるCTL誘導剤の有効成分として、癌ワクチンの有効成分として、また医薬組成物の有効成分として有用である。すなわち本発明の化合物は、本明細書の実施例に示すとおり、優れた免疫原性を有し、優れたCTL誘導活性を効率よく示すことができる。また、本発明の化合物によって誘導されるCTLは、驚くべきことに、癌細胞が本来保有するWT1の天然型部分ペプチドを認識することができる。
CTL誘導活性は、HLAテトラマー法(Int.J.Cancer:100,565-570(2002))または限界希釈法(Nat.Med.:4,321-327(1998))によりCTLの数を測定することにより確認することができる。あるいは、例えばHLA-A24拘束性のCTL誘導活性の場合、国際公開第02/47474号およびInt.J.Cancer:100,565-570(2002)に記述されたHLA-A24モデルマウスを用いることなどにより調べることができる。
また本発明の化合物は、リポソーム製剤、直径数μm のビーズに結合させた粒子状の製剤、リピッドを結合させた製剤などにして投与することもできる。
さらに本発明の化合物(コンジュゲート体)は、MHCクラスII拘束性WT1ペプチド(すなわちヘルパーペプチド)と共に投与することができる。共に投与する方法としては、コンジュゲート体とヘルパーペプチドを個別に投与することも可能であるが、一つの医薬組成物の中にコンジュゲート体とヘルパーペプチドを含むカクテル製剤(カクテル剤、カクテル)がより好ましい。本カクテル製剤は、MHCクラスI拘束性WT1ペプチド(すなわちキラーペプチド)を生じ得るコンジュゲート体およびMHCクラスII拘束性WT1ペプチド(すなわちヘルパーペプチド)を含むものである。よって、癌免疫療法における癌ワクチンとして、ヘルパーペプチドを含有した本カクテル製剤を投与することによって、CTLを含む他のT cellの機能亢進に重要であるヘルパーT細胞(helper T cell)の活性化も可能となり、コンジュゲート体の機能・薬効(細胞性免疫能など)を向上させることができる。
MHCクラスII拘束性WT1ペプチド(すなわちヘルパーペプチド)については、本願明細書中に記載したとおりである。本カクテル製剤のヘルパーペプチドとしては、以下のアミノ酸配列:
CNKRYFKLSHLQMHSRK (配列番号:22)、
CNKRYFKLSHLQMHSRKH (配列番号:23)、
CNKRYFKLSHLQMHSRKHTG (配列番号:24)、
WAPVLDFAPPGASAYGSL (配列番号:244)、
CWAPVLDFAPPGASAYGSL (配列番号:242)および
WAPVLDFAPPGASAYGSLC (配列番号:243)
が挙げられる。中でも、WAPVLDFAPPGASAYGSL (配列番号:244)が好ましい。
本カクテル製剤は、細胞性免疫能などの癌ワクチンとしての薬効が向上されたものであることを、一例として本願明細書の実施例や試験例として示したように、確認できた。
投与方法としては、皮内投与、皮下投与、筋肉内投与、静脈内投与、経皮投与などが挙げられる。CTLを効率良く誘導する皮内投与や皮下投与が好ましい。投与回数および投与間隔は、治療または予防目的の疾患、患者の個体差により適宜調整することができるが、通常複数回であり、数日ないし数月に1回投与するのが好ましい。
このような本発明の化合物を有効成分とする医薬組成物をWT1陽性の患者に投与することにより、癌を治療または予防するための方法を提供することができる。
式(5):
で表される化合物の合成
(C(Npys)RMFPNAPYLの合成)
Fmoc-Leu-Alko-樹脂(Alkoはp-アルコキシベンジルアルコール)282mg(渡辺化学製;0.71mmol/g、0.2mmol)を出発原料としFmoc/tBu法による固相合成によりペプチド鎖の組上げを行った。固相合成にはCS Bio社製CS336X型ペプチド合成機を用い、Fmoc基の脱保護は20%ピペリジンのDMF溶液で5分間および20分間処理することにより行った。保護アミノ酸のカップリングは1.05mmolの保護アミノ酸、1mmolのHBTU、2mmolのDIPEAのDMF溶液と1時間反応させることにより行った。得られた樹脂をDMFおよびエーテルで洗浄後減圧乾燥することにより、Boc-Cys(Npys)-Arg(Pmc)-Met-Phe-Pro-Asn(Trt)-Ala-Pro-Tyr(tBu)-Leu-Alko-樹脂630mgを得た。このペプチド樹脂にTFA/H2O/TIS=95/2.5/2.5の混合液10mlを加え、室温にて2時間振とうした。樹脂を濾去後、反応液を減圧濃縮した。反応液を氷冷しジエチルエーテル50mlを加えた。生じた沈殿物を濾取しエーテルで洗浄後減圧乾燥することにより粗ペプチド217mgを得た。得られた粗ペプチド溶液を20%酢酸水7mlとアセトニトリル1mlの混合液に溶解し逆相HPLCにて精製した。
ポンプ:Shimadzu製;LC-8A型
カラム:YMC ODS-A 3cmφ×25cmL, 10μm
溶出液1:H2O/0.1%TFA
溶出液2:CH3CN/0.1%TFA
流速:20ml/min
検出:UV220nm
2液濃度15%で平衡化させたカラムに粗ペプチド溶液を注入した。その後2液濃度を10分間で37%に上昇させ、その後1分間あたり0.24%の割合で上昇させた。目的物を含む画分を集め凍結乾燥することにより、H-Cys(Npys)-Arg-Met-Phe-Pro-Asn-Ala-Pro-Tyr-Leu-OH 53mgを得た。
質量分析:LC-ESI/MS m/z =1366.1 [M+1]+ (理論値=1366.6)
〔すなわち式(5):
で表される化合物の合成〕
工程1で得たH-Cys(Npys)-Arg-Met-Phe-Pro-Asn-Ala-Pro-Tyr-Leu-OH 50mgと公知の方法(例えばWO07/063903)で合成したH-Cys-Tyr-Thr-Trp-Asn-Gln-Met-Asn-Leu-OH(すなわちCYTWNQMNL(配列番号:4)) 43mgを混合し、DMSO 1mLを加え、室温にて20分間攪拌した。反応液を0.1%TFA水 5mlで希釈し逆相HPLCにて精製した。
ポンプ:Shimadzu製;LC-8A型
カラム:YMC ODS-A 3cmφ×25cmL, 10μm
溶出液1:H2O/0.1%TFA
溶出液2:CH3CN/0.1%TFA
流速:20ml/min
検出:UV220nm
2液濃度25%で平衡化させたカラムに当該反応液を注入した。その後2液濃度を1分間あたり0.25%の割合で上昇させた。目的物を含む画分を集め凍結乾燥した後、逆相HPLCによる再精製、凍結乾燥を行うことにより、(H-Cys-Tyr-Thr-Trp-Asn-Gln-Met-Asn-Leu-OH)(H-Cys-Arg-Met-Phe-Pro-Asn-Ala-Pro-Tyr-Leu-OH) disulfide bond(すなわち式(5)で示される化合物) 21mgを得た。
質量分析:LC-ESI/MS m/z =1191.8 [M+2]2+ (理論値=1191.9)
以下のアミノ酸配列:
CRMFPNAPYL (配列番号:13)
からなるペプチドの合成
質量分析:LC‐ESI/MS m/z=1211.9 [M+1]+ (理論値=1212.5)
ポンプ:Shimadzu製;LC-6A型
カラム:YMC ODS-A 3cmφ×25cmL, 10μm
溶出液1:H2O/0.1%TFA
溶出液2:CH3CN/0.1%TFA
流速:20ml/min検出:UV220nm
質量分析:LC-ESI/MS m/z =1212.0 [M+1]+ (理論値=1211.6)
実施例2と同様の方法で、配列番号:16、18または17のアミノ酸配列からなるペプチドを合成した。表54に、合成量および質量分析結果を示した。
ERAP1によるN末端アミノ酸のトリミングの経時変化
実施例2~5にて合成した配列番号:13、16、18および17の各ペプチドについて、ERAP1(PLoS One November 2008, vol.3, Issue 11, e3658)によるN末端アミノ酸のトリミングを評価した。
30μlのERAP1(2.0mg/ml)PBSバッファー溶液を258μlのTris・HClバッファーに加えた。10mMの各ペプチドのDMSO溶液12.0μlを上述のERAP1溶液に加えて、良く混和した後に室温で静置した。1.0, 2.0, 4.0, 8.0時間後に50μlのサンプルを150μlのMeOHに加えて反応を停止し、25μlをUFLC(分析条件は以下に示す。)に打ち込み、目的とするペプチドのAUCを求めた。トリミングによって得られるペプチドを別に化学的に合成し、酵素の無い同様の条件で分析して得られたAUCを基にして、トリミングによって得られたペプチドの生成率を求めた。
分析条件
ポンプ:Shimadzu社製 UFLC
カラム:Shim-pack XR-ODS 3.0mmi.d.x75mm
溶液:0.1% TFA H2O(A)― 0.1% TFA CH3CN(B)
オーブン温度:40℃
流速:1.0ml/min
検出波長:λ=220nm
グラジエント:
1.0.0minから5.0minでB液濃度を1.0%から70%まで上昇
2.0.0minから5.0minでB液濃度を1.0%から50%まで上昇
目的のペプチド:
実施例2~5にて合成したペプチドについて、ERAP1によるN末端アミノ酸のトリミングにより得られたペプチドのアミノ酸配列を、表55に示した。
HLA-A0201遺伝子導入マウスおよびHLA-A2402遺伝子導入マウスを用いた、in vivoでのCTL誘導能の評価
で表される化合物は、前記の式(1)に照らすと、特に癌抗原ペプチドAがRMFPNAPYL(配列番号:2)であり且つ癌抗原ペプチドBがCYTWNQMNL(配列番号:4)である化合物である。RMFPNAPYL(配列番号:2)はHLA-A0201拘束性WT1ペプチドであり、CYTWNQMNL(配列番号:4)はHLA-A24拘束性エピトープWT1ペプチドである。
各図において、縦軸は播種細胞数中に反応した細胞数を示す。図2の黒棒および白棒はHLA-A0201遺伝子導入マウス由来の脾細胞を配列番号:2で表される目的のペプチドの存在下および非存在下で培養した結果を、図3の黒棒および白棒はHLA-A2402遺伝子導入マウス由来の脾細胞を配列番号:4で表される目的のペプチドの存在下および非存在下で培養した結果を示す。即ち、黒棒と白棒の値の差が、式(5)で表される化合物の投与によってマウス生体内で誘導された目的の各ペプチド特異的CTLの数を示す。
各図中において白棒の値は認められていない。このことは目的のペプチド非存在下ではそれぞれの遺伝子導入マウスの脾細胞は全く反応しなかったことを示している。本試験の結果、HLA-A0201遺伝子導入マウス由来の脾細胞においては配列番号:2で表される目的のペプチド特異的なIFNγ産生が、HLA-A2402遺伝子導入マウス由来の脾細胞においては配列番号:4で表される目的のペプチド特異的なIFNγ産生が確認された。
すなわち、本発明の化合物の一例である式(5)で表される化合物は、異なる2種のWT1ペプチドを式(1)に示されたようなジスルフィド結合を介して複合化されたコンジュゲート体であり、実際にin vivoにおいて異なる2種のCTLを誘導できるWT1癌抗原ペプチドコンジュゲートワクチンであることが、明らかとなった。
実施例2と同様の方法で、配列番号:22、24、23、2、4、6および5の各アミノ酸配列からなる各ペプチドを合成した。表57に質量分析結果を示した。配列番号:22、24、23、2、4、6および5は本願発明の化合物ではないことから、いずれも参考例として記載した。
実施例1と同様の方法で、式(3)、(6)、(7)および(8)で表される各化合物(コンジュゲート体)を合成した。表58に質量分析結果を示した。(各式中、CとCの間の結合はジスルフィド結合を表す。)
溶解度測定
工程1.等張緩衝液の調製
1.75%リン酸水素二ナトリウム水溶液と5.53%クエン酸水溶液を混合し、pH6.0および7.4の各緩衝液を調製した。
工程2.試験溶液の調製
被験物を1mg程度秤量し、等張緩衝液を0.5mL加えこれを試験溶液とした。調製した試験溶液は室温にて90分間振とう(振とう条件: TAITEC社製RECIPRO SHAKER SR-1N, Speed=8)後、遠心分離(15000rpm、5分間、室温)を行い、遠心分離後の上清を試験溶液とした。
工程3.標準液の調製
被験物約1mgを精秤し、0.1%TFA水/アセトニトリル=1/1にて溶解し、全量を10mLとし、これを被験物の標準液として用いた。
工程4.被験物の濃度測定
被験物の標準液および試験溶液をHPLC(分析条件は表59に記載)にて分析し、標準液のピーク面積比より被験物の溶解度を算出した。
HPLC測定条件
カラム:ChemcoPack Quicksorb(4.6 mmφ×150 mm, 5 μm) ケムコ株式会社製
移動相:A液;0.1%TFA水、B液;0.1%TFAアセトニトリル溶液
カラム温度:室温
流速:1mL/min
検出波長:UV 254nm,230nm(2波長検出)
サンプル注入量:10μL
HLA-A0201遺伝子導入マウスを用いた、in vivoでのCTL誘導能の評価
で表される化合物は、前記の式(1)に照らすと、特に癌抗原ペプチドAがRMFPNAPYL(配列番号:2)であり且つ癌抗原ペプチドBがSLGEQQYSV(配列番号:6)である化合物である。RMFPNAPYL(配列番号:2)およびSLGEQQYSV(配列番号:6)はHLA-A0201拘束性WT1ペプチドである。
図4において、縦軸は播種細胞数中に反応した細胞数を示す。図4の黒棒、斜線棒はHLA-A0201遺伝子導入マウス由来の脾細胞を配列番号:2、6で表される各ペプチドをパルスしながら培養した結果を示し、白棒は非パルスで培養した結果を示す。即ち、黒棒または斜線棒と白棒の値の差がペプチド特異的CTLの数を示し、式(3)で表される化合物の投与によってマウス生体内において配列番号:2、6で表される各ペプチドに特異的なCTLが誘導されたことを示す。図4において白棒の値は認められていない。このことは目的のペプチドをパルスしない場合にはHLA-A0201遺伝子導入マウスの脾細胞は全く反応しなかったことを示している。本試験の結果、HLA-A0201遺伝子導入マウス由来の脾細胞において配列番号:2、6で表されるペプチドに特異的なIFNγの産生が確認された。
HLA-A0201遺伝子導入マウスを用いた、in vivoでのCTL誘導能の評価
で表される化合物は、前記の式(1)に照らすと、特に癌抗原ペプチドAがRMFPNAPYL(配列番号:2)であり且つ癌抗原ペプチドCがCNKRYFKLSHLQMHSRKHTG(配列番号:24)である化合物である。RMFPNAPYL(配列番号:2)はHLA-A0201拘束性WT1ペプチドであり、CNKRYFKLSHLQMHSRKHTG (配列番号:24)はMHCクラスII拘束性WT1ペプチド(すなわちヘルパーペプチド)である。
図5および6において、縦軸は播種細胞数中に反応した細胞数を、横軸はマウスに投与した化合物またはペプチドを示す。図5の黒棒はHLA-A0201遺伝子導入マウス由来の脾細胞を配列番号:2で表されるペプチドをパルスしながら培養した結果を示し、白棒は非パルスで培養した結果を示す。即ち、黒棒と白棒の値の差がペプチド特異的CTLの数を示し、配列番号:2で表されるペプチドまたは式(6)で表される化合物の投与によってマウス生体内において配列番号:2で表されるペプチドに特異的なCTLが誘導されたことを示す。図5において白棒の値は認められていない。このことは目的のペプチドをパルスしない場合にはHLA-A0201遺伝子導入マウスの脾細胞は全く反応しなかったことを示している。本試験の結果、HLA-A0201遺伝子導入マウス由来の脾細胞において配列番号:2で表されるペプチドに特異的なIFNγの産生が確認された。また、図5において式(6)で表される化合物の投与によって誘導された配列番号:2で表されるペプチドに特異的なIFNγ産生細胞の数は、配列番号:2で表されるペプチドの投与によって誘導されたペプチド特異的なIFNγ産生細胞の数より多かった。
さらに、図6の黒棒はHLA-A0201遺伝子導入マウス由来の脾細胞を配列番号:24で表されるペプチドをパルスしながら培養した結果を示し、白棒は非パルスで培養した結果を示す。即ち、黒棒と白棒の値の差がペプチド反応性細胞の数を示し、式(6)で表される化合物の投与によってマウス生体内において配列番号:24で表されるヘルパーペプチド反応性の細胞が誘導され、配列番号:2で表される化合物の投与によってマウス生体内において配列番号:24で表されるペプチド反応性の細胞が誘導されなかったことを示す。図6において白棒の値は認められていない。このことは目的のペプチドをパルスしない場合にはHLA-A0201遺伝子導入マウスの脾細胞は全く反応しなかったことを示している。
すなわち、本発明の化合物の一例である式(6)で表される化合物は、異なる2種のペプチドを式(1)に示されたようなジスルフィド結合を介して複合化されたコンジュゲート体であり、実際にin vivoにおいてCTLおよびヘルパーペプチド反応性細胞を誘導できるWT1癌抗原ペプチドコンジュゲートワクチンであることが、明らかとなった。
HLA-A0201遺伝子導入マウスを用いた、in vivoでのCTL誘導能の評価
で表される化合物は、前記の式(1)に照らすと、特に癌抗原ペプチドAがRMFPNAPYL(配列番号:2)であり且つ癌抗原ペプチドCがCNKRYFKLSHLQMHSRK(配列番号:22)である化合物である。RMFPNAPYL(配列番号:2)はHLA-A0201拘束性WT1ペプチドであり、CNKRYFKLSHLQMHSRK(配列番号:22)はMHCクラスII拘束性WT1ペプチド(すなわちヘルパーペプチド)である。
図7および8において、縦軸は播種細胞数中に反応した細胞数を、横軸はマウスに投与した化合物またはペプチドを示す。図7の黒棒はHLA-A0201遺伝子導入マウス由来の脾細胞を配列番号:2で表されるペプチドをパルスしながら培養した結果を示し、白棒は非パルスで培養した結果を示す。即ち、黒棒と白棒の値の差がペプチド特異的CTLの数を示し、配列番号:2で表されるペプチドまたは式(8)で表される化合物の投与によってマウス生体内において配列番号:2で表されるペプチドに特異的なCTLが誘導されたことを示す。図7において白棒の値は認められていない。このことは目的のペプチドをパルスしない場合にはHLA-A0201遺伝子導入マウスの脾細胞は全く反応しなかったことを示している。本試験の結果、HLA-A0201遺伝子導入マウス由来の脾細胞において配列番号:2で表されるペプチドに特異的なIFNγの産生が確認された。また、図7において式(8)で表される化合物の投与によって誘導された配列番号:2で表されるペプチドに特異的なIFNγ産生細胞の数は、配列番号:2で表されるペプチドの投与によって誘導されたペプチド特異的なIFNγ産生細胞の数より多かった。
さらに、図8の黒棒はHLA-A0201遺伝子導入マウス由来の脾細胞を配列番号:22で表されるペプチドをパルスしながら培養した結果を示し、白棒は非パルスで培養した結果を示す。即ち、黒棒と白棒の値の差がペプチド反応性細胞の数を示し、式(8)で表される化合物の投与によってマウス生体内において配列番号:22で表されるヘルパーペプチド反応性の細胞が誘導され、配列番号:2で表されるペプチドの投与によってマウス生体内において配列番号:22で表されるペプチド反応性の細胞が誘導されなかったことを示す。図8において白棒の値は認められていない。このことは目的のペプチドをパルスしない場合にはHLA-A0201遺伝子導入マウスの脾細胞は全く反応しなかったことを示している。
すなわち、本発明の化合物の一例である式(8)で表される化合物は、異なる2種のペプチドを式(1)に示されたようなジスルフィド結合を介して複合化されたコンジュゲート体であり、実際にin vivoにおいてCTLおよびヘルパーペプチド反応性細胞を誘導できるWT1癌抗原ペプチドコンジュゲートワクチンであることが、明らかとなった。
実施例1と同様の方法で、式(9)で表される各化合物(コンジュゲート体)を合成した。表61に質量分析結果を示した。(式中、CとCの間の結合はジスルフィド結合を表す。)
実施例2と同様の方法で、配列番号238~239のアミノ酸配列からなるペプチドを合成した。表62に質量分析結果を示した。表に記載のペプチドは本発明の化合物ではないことから参考例として記載した。
実施例2と同様の方法で、配列番号240~241のアミノ酸配列からなるペプチドを合成した。表63に質量分析結果を示した。表に記載のペプチドは本発明の化合物ではないことから参考例として記載した。
コンジュゲート体及びカクテル化ワクチンの安定性試験
コンジュゲート体(式番号:(6))2.4 mgを120μL注射用水に溶解し、遮光下室温にて保存した。
工程2
カクテル化ワクチンとして配列番号:2で表されるペプチド1.1 mgを180 μLの注射用水に溶解し、これを123 μL用いて配列番号:24で表されるペプチド1.3 mgを溶解し、遮光下室温にて保存した。
工程3
工程1および工程2で得られた溶液2.5 μLを注射用水50 μLで希釈した後、HPLCによる分析(分析条件は以下に示す。)を行い、保存開始直後の面積値を100%として、コンジュゲート体及びペプチドの水溶液中の含有率を測定し、コンジュゲート体の含有率を表64に、カクテル化ワクチン中の各ペプチドの含有率を表65に記載した。
分析条件
ポンプ:Shimadzu社製 UFLC
カラム:Kinetex 2.6u C18 100A 3.0mmi.d.x75mm
移動相:A液;0.1%TFA水、B液;0.1%TFAアセトニトリル溶液
カラム温度:40 ℃
流速:1 mL/min
検出波長:UV 220、254 nm(2波長検出)
サンプル注入量:10 μL
HLA-A0201遺伝子導入マウスを用いた、in vivoでのCTL誘導能の評価
で表される化合物は、前記の式(1)に照らすと、特に癌抗原ペプチドAがRMFPNAPYL(配列番号:2)であり且つ癌抗原ペプチドCがCNKRYFKLSHLQMHSRKH(配列番号:23)である化合物である。RMFPNAPYL(配列番号:2)はHLA-A0201拘束性WT1ペプチドであり、CNKRYFKLSHLQMHSRKH(配列番号:23)はMHCクラスII拘束性WT1ペプチド(すなわちヘルパーペプチド)である。
さらに、図10の黒棒はHLA-A0201遺伝子導入マウス由来の脾細胞を配列番号:23で表されるペプチドをパルスしながら培養した結果を示し、白棒は非パルスで培養した結果を示す。即ち、黒棒と白棒の値の差がペプチド反応性細胞の数を示し、式(7)で表される化合物の投与によってマウス生体内において配列番号:23で表されるヘルパーペプチド反応性の細胞が誘導され、配列番号:2で表されるペプチドの投与によってマウス生体内において配列番号:23で表されるペプチド反応性の細胞が誘導されなかったことを示す。図10において白棒の値は認められていない。このことは目的のペプチドをパルスしない場合にはHLA-A0201遺伝子導入マウスの脾細胞は全く反応しなかったことを示している。
すなわち、本発明の化合物の一例である式(7)で表される化合物は、異なる2種のペプチドを式(1)に示されたようなジスルフィド結合を介して複合化されたコンジュゲート体であり、実際にin vivoにおいてCTLおよびヘルパーペプチド反応性細胞を誘導できるWT1癌抗原ペプチドコンジュゲートワクチンであることが、明らかとなった。
HLA-A0201遺伝子導入マウスを用いた、in vivoでのCTL誘導能の評価
で表される化合物は、前記の式(1)に照らすと、特に癌抗原ペプチドAがALLPAVPSL(配列番号:5)であり且つ癌抗原ペプチドCがCNKRYFKLSHLQMHSRKHG(配列番号:24)である化合物である。ALLPAVPSL(配列番号:5)はHLA-A0201およびHLA-A2402拘束性WT1ペプチドであり、CNKRYFKLSHLQMHSRKHG(配列番号:24)はMHCクラスII拘束性WT1ペプチド(すなわちヘルパーペプチド)である。
さらに、図12の黒棒はHLA-A0201遺伝子導入マウス由来の脾細胞を配列番号:24で表されるペプチドをパルスしながら培養した結果を示し、白棒は非パルスで培養した結果を示す。即ち、黒棒と白棒の値の差がペプチド反応性細胞の数を示し、式(9)で表される化合物の投与によってマウス生体内において配列番号:24で表されるヘルパーペプチド反応性の細胞が誘導され、配列番号:5で表されるペプチドの投与によってマウス生体内において配列番号:24で表されるペプチド反応性の細胞が誘導されなかったことを示す。図12において白棒の値はほとんど認められていない。このことは目的のペプチドをパルスしない場合にはHLA-A0201遺伝子導入マウスの脾細胞は反応しなかったことを示している。
すなわち、本発明の化合物の一例である式(9)で表される化合物は、異なる2種のペプチドを式(1)に示されたようなジスルフィド結合を介して複合化されたコンジュゲート体であり、実際にin vivoにおいてCTLおよびヘルパーペプチド反応性細胞を誘導できるWT1癌抗原ペプチドコンジュゲートワクチンであることが、明らかとなった。
HLA-A0201遺伝子導入マウスおよびHLA-A2402遺伝子導入マウスを用いた、in vivoでのCTL誘導能の評価
で表される化合物については、試験例2に記したとおりである。配列番号:238および239で表されるペプチドは、HLA-A0201拘束性WT1ペプチドであるRMFPNAPYL(配列番号:2)およびHLA-A2402拘束性WT1ペプチドであるCYTWNQMNL(配列番号:4)をアミド結合で連結した長鎖ペプチドである。
各図において、縦軸は播種細胞数中に反応した細胞数を示す。図13の黒棒および白棒はHLA-A0201遺伝子導入マウス由来の脾細胞を配列番号:2で表される目的のペプチドの存在下および非存在下で培養した結果を、図14の黒棒および白棒はHLA-A2402遺伝子導入マウス由来の脾細胞を配列番号:4で表される目的のペプチドの存在下および非存在下で培養した結果を示す。即ち、黒棒と白棒の値の差が、式(5)で表される化合物および配列番号:238、239で表されるペプチドの投与によってマウス生体内で誘導された目的の各ペプチド特異的CTLの数を示す。
各図中において白棒の値は認められていない。このことは目的のペプチド非存在下ではそれぞれの遺伝子導入マウスの脾細胞は全く反応しなかったことを示している。本試験の結果、式(5)で表される化合物を投与したHLA-A0201遺伝子導入マウス由来の脾細胞においては配列番号:2で表される目的のペプチド特異的なIFNγ産生が、式(5)で表される化合物を投与したHLA-A2402遺伝子導入マウス由来の脾細胞においては配列番号:4で表される目的のペプチド特異的なIFNγ産生がそれぞれ確認された。一方で、配列番号238で表されるペプチドを投与したHLA-A0201遺伝子導入マウス由来の脾細胞においては配列番号:2で表される目的のペプチド特異的なIFNγ産生が確認されたものの、式(5)で表される化合物を投与したHLA-A2402遺伝子導入マウス由来の脾細胞と比較するとその数は非常に少なかった。配列番号238で表されるペプチドを投与したHLA-A2402遺伝子導入マウス由来の脾細胞においては配列番号:4で表される目的のペプチド特異的なIFNγ産生が確認された。配列番号239で表されるペプチドを投与したHLA-A0201遺伝子導入マウス由来の脾細胞においては配列番号:2で表される目的のペプチド特異的なIFNγ産生は認められたものの、式(5)で表される化合物を投与したHLA-A0201遺伝子導入マウス由来の脾細胞と比較するとその数は少なかった。配列番号239で表されるペプチドを投与したHLA-A2402遺伝子導入マウス由来の脾細胞においては配列番号:4で表される目的のペプチド特異的なIFNγ産生が確認された。
HLA-A0201遺伝子導入マウスおよびHLA-A2402遺伝子導入マウスを用いた、in vivoでのCTL誘導能の評価
で表される化合物については、試験例2に記したとおりである。配列番号:240および241で表されるペプチドは、HLA-A0201拘束性WT1ペプチドであるRMFPNAPYL(配列番号:2)およびHLA-A2402拘束性WT1ペプチドであるCYTWNQMNL(配列番号:4)を、ペプチドスペーサーとして6個のグリシンを介してアミド結合で連結した長鎖ペプチドである。
各図において、縦軸は播種細胞数中に反応した細胞数を示す。図15の黒棒および白棒はHLA-A0201遺伝子導入マウス由来の脾細胞を配列番号:2で表される目的のペプチドの存在下および非存在下で培養した結果を、図16の黒棒および白棒はHLA-A2402遺伝子導入マウス由来の脾細胞を配列番号:4で表される目的のペプチドの存在下および非存在下で培養した結果を示す。即ち、黒棒と白棒の値の差が、式(5)で表される化合物および配列番号:240、241で表されるペプチドの投与によってマウス生体内で誘導された目的の各ペプチド特異的CTLの数を示す。
各図中において白棒の値は認められていない。このことは目的のペプチド非存在下ではそれぞれの遺伝子導入マウスの脾細胞は反応しなかったことを示している。本試験の結果、式(5)で表される化合物を投与したHLA-A0201遺伝子導入マウス由来の脾細胞においては配列番号:2で表される目的のペプチド特異的なIFNγ産生が、式(5)で表される化合物を投与したHLA-A2402遺伝子導入マウス由来の脾細胞においては配列番号:4で表される目的のペプチド特異的なIFNγ産生がそれぞれ確認された。一方で、配列番号240で表されるペプチドを投与したHLA-A0201遺伝子導入マウス由来の脾細胞においては配列番号:2で表される目的のペプチド特異的なIFNγ産生は極めて少なかったが、配列番号240で表される化合物を投与したHLA-A2402遺伝子導入マウス由来の脾細胞においては配列番号:4で表される目的のペプチド特異的なIFNγ産生が確認された。また、配列番号241で表されるペプチドを投与したHLA-A0201遺伝子導入マウス由来の脾細胞においては配列番号:2で表される目的のペプチド特異的なIFNγ産生は極めて少なく、配列番号241で表されるペプチドを投与したHLA-A2402遺伝子導入マウス由来の脾細胞においては配列番号:4で表される目的のペプチド特異的なIFNγ産生が確認されたものの、式(5)で表される化合物を投与したHLA-A2402遺伝子導入マウス由来の脾細胞と比較するとその数は非常に少なかった。
参考例3にて合成したペプチドならびに実施例6および9にて合成した化合物(コンジュゲート体)について、試験例3と同様の方法にて溶解度測定を行い、各溶解度を表66に示した。
実施例2と同様の方法で、配列番号242~243のアミノ酸配列からなるペプチドを合成した。表67に質量分析結果を示した。表67に記載のペプチドは本発明の化合物である。
実施例1と同様の方法で、式10で表される各化合物(コンジュゲート体)を合成した。表68に質量分析結果を示した。(式中、CとCの間の結合はジスルフィド結合を表す。)
実施例1と同様の方法で、式11で表される各化合物(コンジュゲート体)を合成した。表69に質量分析結果を示した。(式中、CとCの間の結合はジスルフィド結合を表す。)表に記載のペプチドは本発明の化合物ではないことから参考例として記載した。
式(12)
で表される化合物の合成
(Fmoc-C(Mmt)A-SBnの合成)
Fmoc-Cys(Mmt)-OH(4.80g)、N,N-ジイソプロピルエチルアミン(2.56mL)、ヘキサフルオロリン酸(ベンゾトリアゾール-1-イルオキシ)トリピロリジノホスホニウム(4.50g)及び公知の方法(例えばJournal of Organic Chemistry, Vol. 64, No. 24 8761-8769)にて合成されたH-Ala-SBnのクロロホルム(20mL)溶液を室温にて1時間撹拌した。反応液をカラムクロマトグラフィー(溶出溶媒はヘキサン/酢酸エチル)にて精製することで目的化合物であるFmoc-C(Mmt)A-SBn(2.80g)を得た。
NMR:1H NMR (CDCl3)δ 7.72 (t, J = 7.6 Hz, 2H), 7.54 (d, J = 7.2 Hz, 1H), 7.38-7.34 (m, 7H), 7.29-7.25 (m, 6H), 7.23-7.15 (m, 7H), 6.76 (d, J = 8.8 Hz, 2H), 6.15 (d, J = 8.0 Hz, 1H), 4.95 (d, J = 7.2 Hz, 1H), 4.57 (quin, J = 7.6 Hz, 1H), 4.35 (d, J = 6.8 Hz, 2H) 4.19-4.17 (m, 1H), 4.04 (s, 2H), 3.73 (s, 3H), 2.72 (dd, J = 13.2, 8.4 Hz, 1H), 2.61 (d, J = 9.6 Hz, 1H), 1.31 (d, J = 7.2 Hz, 3H).
(C(Mmt)ACYTWNQMNLの合成)
工程1で得たFmoc-Cys(Mmt)-Ala-SBn(11mg)と公知の方法(例えばWO07/063903)で合成したH-Cys-Tyr-Thr-Trp-Asn-Gln-Met-Asn-Leu-OH(21mg)、N,N-ジイソプロピルエチルアミン(200μL)、3,3’,3’’-フォスファネトリルトリプロパン酸塩酸塩(1mg)、4-メルカプトフェニル酢酸(1mg)及び0.1Mリン酸ナトリウム緩衝液(pH7.5、200μL)のDMF(400μL)溶液を室温にて4時間撹拌した。反応液にジエチルアミン(200μL)を加え更に15分撹拌した。反応液を逆相HPLCにて精製することで、目的化合物であるC(Mmt)ACYTWNQMNL(7mg)を得た。
質量分析:LC-ESI/MS m/z=810.2 [M+2H]2+ (理論値=810.5)
〔すなわち式(13):
で表される化合物の合成〕
工程2で得たH-Cys(Mmt)-Ala-Cys-Tyr-Thr-Trp-Asn-Gln-Met-Asn-Leu-OH(51mg)と実施例1工程1で得た(H-Cys(Npys)-Arg-Met-Phe-Pro-Asn-Ala-Pro-Tyr-Leu-OH(43mg)のDMF(4mL)溶液を室温にて2時間撹拌した。反応液を逆相HPLCにて精製することで目的化合物である(H-Cys(Mmt)-Ala-Cys-Tyr-Thr-Trp-Asn-Gln-Met-Asn-Leu-OH)(H-Cys-Arg-Met-Phe-Pro-Asn-Ala-Pro-Tyr-Leu-OH) disulfide bond〔すなわち式(13)で示される化合物〕を39mgを得た。
質量分析:LC-ESI/MS m/z=1414.4 [M+2H]2+ (理論値=1415.2)
(C(SPy)NKRYFKLSHLQMHSRKの合成)
参考例1で得たH-Cys-Asn-Lys-Arg-Tyr-Phe-Lys-Leu-Ser-His-Leu-Gln-Met-His-Ser-Arg-Lys-OH(182mg)と2,2’-ジピリジルビスルフィド(0.2Mイソプロパノール溶液、544μL)の20%w/w酢酸水(4mL)溶液を室温にて17時間撹拌した。反応液を逆相HPLCにて精製することで目的化合物であるH-Cys(SPy)-Asn-Lys-Arg-Tyr-Phe-Lys-Leu-Ser-His-Leu-Gln-Met-His-Ser-Arg-Lys-OHを177mg得た。
質量分析:LC-ESI/MS m/z=1143.5 [M+2H]2+ (理論値=1142.9)
工程3で得た(H-Cys(Mmt)-Ala-Cys-Tyr-Thr-Trp-Asn-Gln-Met-Asn-Leu-OH)(H-Cys-Arg-Met-Phe-Pro-Asn-Ala-Pro-Tyr-Leu-OH) disulfide bond〔すなわち式(13)で示される化合物〕(9mg)、工程4で得たH-Cys(SPy)-Asn-Lys-Arg-Tyr-Phe-Lys-Leu-Ser-His-Leu-Gln-Met-His-Ser-Arg-Lys-OH(24mg)及びトリイソプロピルシラン(10μL)のトリフルオロ酢酸(190μL)溶液を室温にて1時間撹拌した。反応液を逆相HPLCにて精製することで目的化合物である式(12)で表される化合物を5mg得た。
質量分析:LC-ESI/MS m/z=1577.2 [M+3H]3+ (理論値=1577.9)
実施例14と同様の方法で、式14~15で表される各化合物(コンジュゲート体)を合成した。表70に質量分析結果を示した。(式中、CとCの間の結合はジスルフィド結合を表す。)
実施例2と同様の方法で、配列番号244のアミノ酸配列からなるペプチドを合成した。表71に質量分析結果を示した。表に記載のペプチドは本発明の化合物ではないことから参考例として記載した。
HLA-A0201遺伝子導入マウスを用いた、in vivoでのCTL誘導能の評価
で表される化合物は、前記の式(1)に照らすと、特に癌抗原ペプチドAがRMFPNAPYL(配列番号:2)であり且つ癌抗原ペプチドBがWAPVLDFAPPGASAYGSL(配列番号:244)である化合物である。RMFPNAPYL(配列番号:2)はHLA-A0201拘束性WT1ペプチドであり、WAPVLDFAPPGASAYGSL(配列番号:244)はMHCクラスII拘束性WT1ペプチド(すなわちヘルパーペプチド)である。
すなわち、本発明の化合物の一例である式(10)で表される化合物は、異なる2種のペプチドを式(1)に示されたようなジスルフィド結合を介して複合化されたコンジュゲート体であり、実際にin vivoにおいてCTLおよびヘルパーペプチド反応性細胞を誘導できるWT1癌抗原ペプチドコンジュゲートワクチンであることが明らかとなった。
HLA-A0201遺伝子導入マウスを用いた、in vivoでのCTL誘導能の評価
で表される化合物は、前記の式(1)に照らすと、特に癌抗原ペプチドAがRMFPNAPYL(配列番号:2)であり且つ癌抗原ペプチドCがWAPVLDFAPPGASAYGSLC(配列番号:243)である化合物である。RMFPNAPYL(配列番号:2)はHLA-A0201拘束性WT1ペプチドであり、WAPVLDFAPPGASAYGSL(配列番号:244)はMHCクラスII拘束性WT1ペプチド(すなわちヘルパーペプチド)である。
HLA-A0201遺伝子導入マウスおよびHLA-A2402遺伝子導入マウスを用いた、in vivoでのCTL誘導能の評価
で表される化合物に含まれるRMFPNAPYL(配列番号:2)はHLA-A0201拘束性WT1ペプチド、CYTWNQMNL(配列番号:4)はHLA-A2402拘束性WT1ペプチドであり、CNKRYFKLSHLQMHSRK(配列番号:22)はMHCクラスII拘束性WT1ペプチド(すなわちヘルパーペプチド)である。
各図において、縦軸は播種細胞数中に反応した細胞数を示す。図19の黒棒および白棒はHLA-A0201遺伝子導入マウス由来の脾細胞を配列番号:2で表される目的のペプチドの存在下および非存在下で培養した結果を、図20の黒棒および白棒はHLA-A2402遺伝子導入マウス由来の脾細胞を配列番号:4で表される目的のペプチドの存在下および非存在下で培養した結果を示す。即ち、黒棒と白棒の値の差が、式(5)および式(12)で表される化合物の投与によってマウス生体内で誘導された目的の各ペプチド特異的CTLの数を示す。
各図中において白棒の値は認められていない。このことは目的のペプチド非存在下ではそれぞれの遺伝子導入マウスの脾細胞は反応しなかったことを示している。本試験の結果、式(5)および式(12)で表される化合物を投与したHLA-A0201遺伝子導入マウス由来の脾細胞においては配列番号:2で表される目的のペプチド特異的なIFNγ産生が、式(5)および式(12)で表される化合物を投与したHLA-A2402遺伝子導入マウス由来の脾細胞においては配列番号:4で表される目的のペプチド特異的なIFNγ産生がそれぞれ確認された。また、図19において式(12)で表される化合物の投与によって誘導された配列番号:2で表されるペプチドに特異的なIFNγ産生細胞の数は、式(5)で表される化合物の投与によって誘導されたペプチド特異的なIFNγ産生細胞の数より多かった。一方、図20において式(12)で表される化合物の投与によって誘導された配列番号:4で表されるペプチドに特異的なIFNγ産生細胞の数は、式(5)で表される化合物の投与によって誘導されたペプチド特異的なIFNγ産生細胞の数と比べて大きな差は認められなかった。
すなわち、本発明の化合物の一例である式(12)で表される化合物は、異なる3種のペプチドをジスルフィド結合を介して複合化されたコンジュゲート体であり、実際にin vivoにおいてCTLおよびヘルパーペプチド反応性細胞を誘導できるWT1癌抗原ペプチドコンジュゲートワクチンであることが明らかとなった。
HLA-A0201遺伝子導入マウスおよびHLA-A2402遺伝子導入マウスを用いた、in vivoでのCTL誘導能の評価
で表される化合物に含まれるRMFPNAPYL(配列番号:2)はHLA-A0201拘束性WT1ペプチド、CYTWNQMNL(配列番号:4)はHLA-A2402拘束性WT1ペプチドであり、WAPVLDFAPPGASAYGSL(配列番号:244)はMHCクラスII拘束性WT1ペプチド(すなわちヘルパーペプチド)である。
各図において、縦軸は播種細胞数中に反応した細胞数を示す。図21の黒棒および白棒はHLA-A0201遺伝子導入マウス由来の脾細胞を配列番号:2で表される目的のペプチドの存在下および非存在下で培養した結果を、図22の黒棒および白棒はHLA-A2402遺伝子導入マウス由来の脾細胞を配列番号:4で表される目的のペプチドの存在下および非存在下で培養した結果を示す。即ち、黒棒と白棒の値の差が、式(5)および式(14)で表される化合物の投与によってマウス生体内で誘導された目的の各ペプチド特異的CTLの数を示す。
各図中において白棒の値は認められていない。このことは目的のペプチド非存在下ではそれぞれの遺伝子導入マウスの脾細胞は反応しなかったことを示している。本試験の結果、式(5)および式(14)で表される化合物を投与したHLA-A0201遺伝子導入マウス由来の脾細胞においては配列番号:2で表される目的のペプチド特異的なIFNγ産生が、式(5)および式(14)で表される化合物を投与したHLA-A2402遺伝子導入マウス由来の脾細胞においては配列番号:4で表される目的のペプチド特異的なIFNγ産生がそれぞれ確認された。また、図21、22において式(14)で表される化合物の投与によって誘導された配列番号:2、4で表されるペプチドに特異的なIFNγ産生細胞の数は、式(5)で表される化合物の投与によって誘導されたペプチド特異的なIFNγ産生細胞の数より多かった。
すなわち、本発明の化合物の一例である式(14)で表される化合物は、異なる3種のペプチドをジスルフィド結合を介して複合化されたコンジュゲート体であり、実際にin vivoにおいてCTLおよびヘルパーペプチド反応性細胞を誘導できるWT1癌抗原ペプチドコンジュゲートワクチンであることが明らかとなった。
HLA-A0201遺伝子導入マウスを用いた、in vivoでのCTL誘導能の評価
で表される化合物に含まれるRMFPNAPYL(配列番号:2)はHLA-A0201拘束性WT1ペプチド、CYTWNQMNL(配列番号:4)はHLA-A2402拘束性WT1ペプチドであり、CNKRYFKLSHLQMHSRK(配列番号:22)はMHCクラスII拘束性WT1ペプチド(すなわちヘルパーペプチド)である。
図23において、縦軸は播種細胞数中に反応した細胞数を示す。図23の黒棒および白棒はHLA-A0201遺伝子導入マウス由来の脾細胞を配列番号:2で表される目的のペプチドの存在下および非存在下で培養した結果を示す。即ち、黒棒と白棒の値の差が、式(5)で表される化合物およびヘルパーペプチド(配列番号:22)を含むカクテルワクチンの投与によってマウス生体内で誘導された目的の各ペプチド特異的CTLの数を示す。
図23において白棒の値は認められていない。このことは目的のペプチド非存在下ではそれぞれの遺伝子導入マウスの脾細胞は反応しなかったことを示している。本試験の結果、式(5)で表される化合物を単独投与、およびヘルパーペプチド(配列番号:22)を含むカクテルワクチンを投与したHLA-A0201遺伝子導入マウス由来の脾細胞においては配列番号:2で表される目的のペプチド特異的なIFNγ産生が確認された。また、図23においてヘルパーペプチド(配列番号:22)を含むカクテルワクチンの投与によって誘導された配列番号:2で表されるペプチドに特異的なIFNγ産生細胞の数は、式(5)で表される化合物の単独投与によって誘導されたペプチド特異的なIFNγ産生細胞の数より多かった。
HLA-A0201遺伝子導入マウスを用いた、in vivoでのCTL誘導能の評価
で表される化合物に含まれるRMFPNAPYL(配列番号:2)はHLA-A0201拘束性WT1ペプチド、CYTWNQMNL(配列番号:4)はHLA-A2402拘束性WT1ペプチドであり、WAPVLDFAPPGASAYGSL(配列番号:244)はMHCクラスII拘束性WT1ペプチド(すなわちヘルパーペプチド)である。
図24において、縦軸は播種細胞数中に反応した細胞数を示す。図24の黒棒および白棒はHLA-A0201遺伝子導入マウス由来の脾細胞を配列番号:2で表される目的のペプチドの存在下および非存在下で培養した結果を示す。即ち、黒棒と白棒の値の差が、式(5)で表される化合物およびヘルパーペプチド(配列番号:244)を含むカクテルワクチンの投与によってマウス生体内で誘導された目的の各ペプチド特異的CTLの数を示す。
図24において白棒の値は認められていない。このことは目的のペプチド非存在下ではそれぞれの遺伝子導入マウスの脾細胞は反応しなかったことを示している。本試験の結果、式(5)で表される化合物を単独投与、およびヘルパーペプチド(配列番号:244)を含むカクテルワクチンを投与したHLA-A0201遺伝子導入マウス由来の脾細胞においては配列番号:2で表される目的のペプチド特異的なIFNγ産生が確認された。また、図24においてヘルパーペプチド(配列番号:244)を含むカクテルワクチンの投与によって誘導された配列番号:2で表されるペプチドに特異的なIFNγ産生細胞の数は、式(5)で表される化合物の単独投与によって誘導されたペプチド特異的なIFNγ産生細胞の数より多かった。
HLA-A0201遺伝子導入マウスを用いた、in vivoでのCTL誘導能の評価
で表される化合物に含まれるRMFPNAPYL(配列番号:2)はHLA-A0201拘束性WT1ペプチド、CYTWNQMNL(配列番号:4)はHLA-A2402拘束性WT1ペプチドであり、CNKRYFKLSHLQMHSRKTG(配列番号:24)はMHCクラスII拘束性WT1ペプチド(すなわちヘルパーペプチド)である。
図25において、縦軸は播種細胞数中に反応した細胞数を示す。図25の黒棒および白棒はHLA-A0201遺伝子導入マウス由来の脾細胞を配列番号:2で表される目的のペプチドの存在下および非存在下で培養した結果を示す。即ち、黒棒と白棒の値の差が、式(5)で表される化合物およびヘルパーペプチド(配列番号:24)を含むカクテルワクチンの投与によってマウス生体内で誘導された目的の各ペプチド特異的CTLの数を示す。
図25において白棒の値は認められていない。このことは目的のペプチド非存在下ではそれぞれの遺伝子導入マウスの脾細胞は反応しなかったことを示している。本試験の結果、式(5)で表される化合物を単独投与、およびヘルパーペプチド(配列番号:24)を含むカクテルワクチンを投与したHLA-A0201遺伝子導入マウス由来の脾細胞においては配列番号:2で表される目的のペプチド特異的なIFNγ産生が確認された。また、図25においてヘルパーペプチド(配列番号:24)を含むカクテルワクチンの投与によって誘導された配列番号:2で表されるペプチドに特異的なIFNγ産生細胞の数は、式(5)で表される化合物の単独投与によって誘導されたペプチド特異的なIFNγ産生細胞の数より多かった。
HLA-A0201遺伝子導入マウスを用いた、in vivoでのCTL誘導能の評価
で表される化合物に含まれるRMFPNAPYL(配列番号:2)はHLA-A0201拘束性WT1ペプチド、CYTWNQMNL(配列番号:4)はHLA-A2402拘束性WT1ペプチドであり、CWAPVLDFAPPGASAYGSL(配列番号:242)に含まれるWAPVLDFAPPGASAYGSL(配列番号:244)はMHCクラスII拘束性WT1ペプチド(すなわちヘルパーペプチド)である。
図26において、縦軸は播種細胞数中に反応した細胞数を示す。図26の黒棒および白棒はHLA-A0201遺伝子導入マウス由来の脾細胞を配列番号:2で表される目的のペプチドの存在下および非存在下で培養した結果を示す。即ち、黒棒と白棒の値の差が、式(5)で表される化合物およびヘルパーペプチド(配列番号:242)を含むカクテルワクチンの投与によってマウス生体内で誘導された目的の各ペプチド特異的CTLの数を示す。
図26において白棒の値は認められていない。このことは目的のペプチド非存在下ではそれぞれの遺伝子導入マウスの脾細胞は反応しなかったことを示している。本試験の結果、式(5)で表される化合物を単独投与、およびヘルパーペプチド(配列番号:242)を含むカクテルワクチンを投与したHLA-A0201遺伝子導入マウス由来の脾細胞においては配列番号:2で表される目的のペプチド特異的なIFNγ産生が確認された。また、図26においてヘルパーペプチド(配列番号:242)を含むカクテルワクチンの投与によって誘導された配列番号:2で表されるペプチドに特異的なIFNγ産生細胞の数は、式(5)で表される化合物の単独投与によって誘導されたペプチド特異的なIFNγ産生細胞の数より多かった。
HLA-A0201遺伝子導入マウスを用いた、in vivoでのCTL誘導能の評価
で表される化合物に含まれるRMFPNAPYL(配列番号:2)はHLA-A0201拘束性WT1ペプチド、CYTWNQMNL(配列番号:4)はHLA-A2402拘束性WT1ペプチドであり、WAPVLDFAPPGASAYGSLC(配列番号:243)に含まれるWAPVLDFAPPGASAYGSL(配列番号:244)はMHCクラスII拘束性WT1ペプチド(すなわちヘルパーペプチド)である。
図27において、縦軸は播種細胞数中に反応した細胞数を示す。図27の黒棒および白棒はHLA-A0201遺伝子導入マウス由来の脾細胞を配列番号:2で表される目的のペプチドの存在下および非存在下で培養した結果を示す。即ち、黒棒と白棒の値の差が、式(5)で表される化合物およびヘルパーペプチド(配列番号:243)を含むカクテルワクチンの投与によってマウス生体内で誘導された目的の各ペプチド特異的CTLの数を示す。
図27において白棒の値は認められていない。このことは目的のペプチド非存在下ではそれぞれの遺伝子導入マウスの脾細胞は反応しなかったことを示している。本試験の結果、式(5)で表される化合物を単独投与、およびヘルパーペプチド(配列番号:243)を含むカクテルワクチンを投与したHLA-A0201遺伝子導入マウス由来の脾細胞においては配列番号:2で表される目的のペプチド特異的なIFNγ産生が確認された。また、図27においてヘルパーペプチド(配列番号:243)を含むカクテルワクチンの投与によって誘導された配列番号:2で表されるペプチドに特異的なIFNγ産生細胞の数は、式(5)で表される化合物の単独投与によって誘導されたペプチド特異的なIFNγ産生細胞の数より多かった。
フィルター濾過を経た後に、HLA-A2402遺伝子導入マウスを用いた、in vivoでのCTL誘導能の評価
ジスルフィド結合を介して形成した配列番号4のホモダイマーおよび式(5)で表される化合物を3-10mg/mLとなるように注射用水にて溶解する。各化合物の薬理活性を、CTL誘導活性を指標としてHLA-A2402遺伝子導入マウス (C57BL/6CrHLA-A2402/Kb)を利用して評価する。HLA-A2402遺伝子導入マウスに投与するにあたり、注射用水で溶解した化合物をタンパク質低結合性のフィルター(注射剤の滅菌処理を目的としたグレードのメンブランフィルター)にて濾過滅菌したのち、不完全フロイントアジュバントと混合しエマルション化させる。
エマルション化させた化合物はHLA-A2402遺伝子導入マウスの尾根部皮内に投与する。投与1週間後、マウスをCO2ガスにより安楽死させたのち脾臓あるいは鼠蹊部リンパ節を摘出し、脾細胞あるいはリンパ節細胞を調製する。IFNγ産生の測定には、IFNγ ELISPOT assay kitを用いる。細胞調製の前日に、ELISPOTプレートを抗マウスIFNγ抗体で処理し、当日に10%FBSを含むRPMI1640培地でブロッキングする。調製したマウス由来の細胞をブロッキングしたELISPOTプレートに播種する。ペプチド(配列番号:4)をDMSOで40mg/mLに溶解し、さらに10%FBSを含むRPMI1640培地で40μg/mLに希釈する。希釈したペプチド(配列番号:4)を、最終濃度10μg/mLでHLA-A2402遺伝子導入マウス由来の脾細胞あるいはリンパ節細胞に添加する。ペプチドを添加した細胞を、16-20時間、37℃、5% CO2下で培養することで、in vitroにおけるペプチド再刺激を加える。培養後に上清を除いたのち、ELISPOTプレートを、添付のプロトコールに従って発色させる。発色したスポット数は、ImmunoSpot Analyzer(C.T.L.社製)によって測定する。
Claims (6)
- 式(1):
[式中、XaおよびYaは、単結合を表し、
癌抗原ペプチドAは、以下のアミノ酸配列:
RMFPNAPYL (配列番号:2)、
ALLPAVPSL (配列番号:5)、
SLGEQQYSV (配列番号:6)および
RVPGVAPTL (配列番号:7)
の中から選ばれるいずれかのアミノ酸配列からなるペプチドを表し、癌抗原ペプチドAのN末端アミノ酸のアミノ基が式(1)中のYaと結合し、癌抗原ペプチドAのC末端アミノ酸のカルボニル基が式(1)中の水酸基と結合し、
R1は、癌抗原ペプチドCを表し、
癌抗原ペプチドCは、癌抗原ペプチドAとは配列が異なり且つ以下のアミノ酸配列:
CMTWNQMNL (配列番号:3)および
CYTWNQMNL (配列番号:4)
の中から選ばれるいずれかのアミノ酸配列からなるペプチドを表し、癌抗原ペプチドCのシステイン残基のチオエーテル基が式(1)中のチオエーテル基と結合する。]
で表される化合物、またはその薬学上許容される塩。 - 請求項1~3のいずれか一項に記載の化合物またはその薬学上許容される塩、および薬学的に許容される担体を含有する医薬組成物。
- 請求項4に記載の医薬組成物であって、
以下のアミノ酸配列:
CNKRYFKLSHLQMHSRK (配列番号:22)、
CNKRYFKLSHLQMHSRKH (配列番号:23)、
CNKRYFKLSHLQMHSRKHTG (配列番号:24)、
WAPVLDFAPPGASAYGSL (配列番号:244)、
CWAPVLDFAPPGASAYGSL (配列番号:242)および
WAPVLDFAPPGASAYGSLC (配列番号:243)、
からなる群から選択されるアミノ酸配列からなるペプチドを一つ以上含む組成物。 - 式(4):
(式中、CとCの間の結合はジスルフィド結合を表す。)
で表される化合物、および式(5):
(式中、CとCの間の結合はジスルフィド結合を表す。)
で表される化合物からなる群から選択される化合物と、
以下のアミノ酸配列:
CNKRYFKLSHLQMHSRK (配列番号:22)、
CNKRYFKLSHLQMHSRKH (配列番号:23)、
CNKRYFKLSHLQMHSRKHTG (配列番号:24)、
WAPVLDFAPPGASAYGSL (配列番号:244)、
CWAPVLDFAPPGASAYGSL (配列番号:242)および
WAPVLDFAPPGASAYGSLC (配列番号:243)、
からなる群から選択されるアミノ酸配列からなるペプチドを一つ以上含む組成物。
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