Cdca1-derived peptide and vaccine containing same

Abstract

The present invention provides CDCA1-derived epitope peptides having the ability to induce cytotoxic T cells. The present invention further provides polynucleotides encoding the peptides, antigen-presenting cells presenting the peptides, and cytotoxic T cells targeting the peptides, as well as methods of inducing the antigen-presenting cells or CTLs. The present invention also provides compositions and pharmaceutical compositions containing them as an active ingredient. Further, the present invention provides methods of treating and/or preventing cancer, and/or preventing postoperative recurrence thereof, using the peptides, polynucleotides, antigen-presenting cells, cytotoxic T cells or pharmaceutical compositions of the present invention. Methods of inducing an immune response against cancer are also provided.

1 . An isolated peptide of less than 15 amino acids having cytotoxic T cell (CTL)-inducing ability, which comprises the amino acid sequence selected from the group below:
 (a) the amino acid sequence selected from the group consisting of SEQ ID NOs: 1, 8, 10, 13, 25, 33 to 35 and 37; and   (b) the amino acid sequence in which one, two, three or several amino acids are substituted, deleted, inserted and/or added to the amino acid sequence selected from the group consisting of SEQ ID NOs: 1, 8, 10, 13, 25, 33 to 35 and 37.   
     
     
         2 . The peptide of  claim 1 , comprising the amino acid sequence in which one or more substitution(s) selected from (a) to (c) below is introduced into the amino acid sequence selected from the group consisting of SEQ ID NOs: 1, 8, 10, 13, 25, 33 to 35 and 37:
 (a) the second amino acid from the N terminus is substituted with an amino acid selected from the group consisting of threonine and serine;   (b) the third amino acid from the N terminus is substituted with an amino acid selected from the group consisting of aspartic acid and glutamic acid; and   (c) the C-terminal amino acid is substituted with tyrosine.   
     
     
         3 . The peptide of  claim 1 , which consists of the amino acid sequence selected from the group consisting of SEQ ID NOs: 1, 8, 10, 13, 25, 33 to 35 and 37. 
     
     
         4 . An isolated polynucleotide, which encodes the peptide of  claim 1 . 
     
     
         5 . A composition comprising a pharmaceutically acceptable carrier and at least one ingredient selected from the group consisting of (a) to (e) below:
 (a) one or more types of peptides of  claim 1 ;   (b) one or more types of polynucleotides encoding the peptide(s) of  claim 1  in an expressible form;   (c) an antigen-presenting cell (APC) that presents on its cell surface a complex of the peptide of  claim 1  and an HLA antigen;   (d) an exosome that presents on its cell surface a complex of the peptide of  claim 1  and an HLA antigen; and   (e) a CTL that targets the peptide of  claim 1 .   
     
     
         6 . A composition for inducing a CTL(s), comprising a pharmaceutically acceptable carrier and at least one ingredient selected from the group consisting of (a) to (d) below:
 (a) one or more types of peptides of  claim 1 ;   (b) one or more types of polynucleotides encoding the peptide(s) of  claim 1  in an expressible form;   (c) an antigen-presenting cell (APC) that presents on its cell surface a complex of the peptide of  claim 1  and an HLA antigen; and   (d) an exosome that presents on its cell surface a complex of the peptide of  claim 1  and an HLA antigen.   
     
     
         7 . The composition of  claim 5 , which is a pharmaceutical composition. 
     
     
         8 . The composition of  claim 7 , which is for one or more uses selected from the group consisting of (i) cancer treatment, (ii) cancer prevention (prophylaxis) and (iii) prevention (prophylaxis) of postoperative cancer recurrence. 
     
     
         9 . The composition of  claim 7 , which is for inducing an immune response against cancer. 
     
     
         10 . The composition of  claim 8 , wherein the cancer is selected from the group consisting of bladder cancer, breast cancer, cervical cancer, cholangiocellular cancer, chronic myeloid leukemia (CML), esophagus cancer, gastric cancer, non-small-cell lung cancer, lymphoma, osteosarcoma, prostate cancer, kidney cancer, small-cell lung cancer, head and neck cancer, soft tissue tumor and colon cancer. 
     
     
         11 . The composition of  claim 5 , which is formulated for administration to a subject positive for HLA-A01. 
     
     
         12 . A method of inducing an APC(s) having CTL-inducing ability, which comprises a step selected from the group consisting of:
 (a) contacting an APC(s) with the peptide of  claim 1  in vitro, ex vivo or in vivo; and   (b) introducing a polynucleotide encoding the peptide of  claim 1  into an APC(s).   
     
     
         13 . A method of inducing a CTL(s), which comprises a step selected from the group consisting of:
 (a) co-culturing a CD8-positive T cell(s) with an APC(s) that presents on its surface a complex of an HLA antigen and the peptide of  claim 1 ;   (b) co-culturing a CD8-positive T cell(s) with an exosome(s) that presents on its surface a complex of an HLA antigen and the peptide of  claim 1 ; and   (c) introducing into a CD8-positive T cell(s) a polynucleotide encoding each subunit of a T cell receptor (TCR) capable of binding to the peptide of  claim 1  presented by an HLA antigen on a cell surface.   
     
     
         14 . An isolated APC that presents on its surface a complex of an HLA antigen and the peptide of  claim 1 . 
     
     
         15 . An isolated APC induced by the method of  claim 12 . 
     
     
         16 . An isolated CTL that targets the peptide of  claim 1 . 
     
     
         17 . An isolated CTL induced by the method of  claim 13 . 
     
     
         18 . A method of inducing an immune response against cancer, which comprises administering to a subject at least one ingredient selected from the group consisting of (a) to (e) below:
 (a) one or more types of peptides of  claim 1 ;   (b) one or more types of polynucleotides encoding the peptide(s) of  claim 1  in an expressible form;   (c) an antigen-presenting cell (APC) that presents on its cell surface a complex of the peptide of  claim 1  and an HLA antigen;   (d) an exosome that presents on its cell surface a complex of the peptide of  claim 1  and an HLA antigen; and   (e) a CTL that targets the peptide of  claim 1 .   
     
     
         19 . A method of treating and/or preventing cancer, and/or preventing postoperative recurrence thereof, which comprises administering to a subject at least one ingredient selected from the group consisting of (a) to (e) below:
 (a) one or more types of peptides of  claim 1 ;   (b) one or more types of polynucleotides encoding the peptide(s) of  claim 1  in an expressible form;   (c) an antigen-presenting cell (APC) that presents on its cell surface a complex of the peptide of  claim 1  and an HLA antigen;   (d) an exosome that presents on its cell surface a complex of the peptide of  claim 1  and an HLA antigen; and   (e) a CTL that targets the peptide of  claim 1 .   
     
     
         20 . An antibody that binds to the peptide of  claim 1 . 
     
     
         21 . A method of screening for a peptide having CTL-inducing ability, which comprises the steps of:
 (a) generating candidate sequences consisting of an amino acid sequence in which one, two or several amino acid residues are substituted, deleted, inserted and/or added to an original amino acid sequence consisting of the amino acid sequence selected from among SEQ ID NOs: 1, 8, 10, 13, 25, 33 to 35 and 37;   (b) selecting from among the candidate sequences generated in (a), a candidate sequence that does not have significant homology (sequence identity) with any known human gene product other than CDCA1;   (c) contacting an APC with a peptide consisting of the candidate sequence selected in (b);   (d) contacting the APC of (c) with a CD8-positive T cell; and   (e) selecting a peptide having an equal to or higher CTL-inducing ability than that of a peptide consisting of the original amino acid sequence.   
     
     
         22 . An emulsion comprising one or more types of peptides of  claim 1 , a water-soluble carrier and an oil adjuvant. 
     
     
         23 . A kit comprising a container that houses the composition of  claim 5  and a container that houses an adjuvant.