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Cd8 T‐cell recognition of human 5T4 oncofetal antigen
Author(s) -
Smyth Lucy JC,
Elkord Eyad,
Taher Taher E.I.,
Jiang HuiRong,
Burt Deborah J.,
Clayton Alison,
van Veelen Peter A.,
de Ru Arnoud,
Ossendorp Ferry,
Melief Cornelis J. M.,
Drijfhout Jan W.,
Dermime Said,
Hawkins Robert E.,
Stern Peter L.
Publication year - 2006
Publication title -
international journal of cancer
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.475
H-Index - 234
eISSN - 1097-0215
pISSN - 0020-7136
DOI - 10.1002/ijc.22018
Subject(s) - oncofetal antigen , elispot , epitope , cytotoxic t cell , antigen , biology , cd8 , immunotherapy , tumor antigen , immunology , cancer research , human leukocyte antigen , t cell , immune system , biochemistry , tumor associated antigen , in vitro
Abstract The 5T4 oncofetal antigen is expressed by a wide variety of human carcinomas, including colorectal, ovarian and gastric carcinomas. The restricted expression of 5T4 on tumor tissues as well as its implication in tumor progression and bad prognosis makes 5T4 a promising new candidate for immunotherapy. An MVA vaccine encoding 5T4 antigen has been successfully evaluated in preclinical studies in a murine tumor model. Here, we report the generation of human CD8 T cells specific for the 5T4 antigen by stimulation with autologous monocyte derived DC infected with a replication defective adenovirus encoding the 5T4 cDNA (Ad5T4). Analysis of several donors confirms a repertoire of such CD8 responses. In a parallel approach, incorporating the results of proteasome‐mediated digestion of 5T4 derived 35‐mer peptides and the potential high affinity epitopes predicted by a computer‐based algorithm, we identified 8 putative HLA‐A*0201‐presented CD8 MHC class I epitopes of 5T4 antigen. Two of these generated specific CD8 T cells after restimulation with peptide loaded autologous DC and assay by cytotoxicity and IFNγ ELISPOT. Moreover these particular peptide generated T cells recognized naturally 5T4 positive tumor cells only if they expressed HLA‐A*0201 as judged by IFNγ ELISPOT or ELISA. Also, HLA‐A*0201 CD8 T cells recognized these peptides in a DC‐Ad5T4 polyclonal response. In conclusion, there is a repertoire of CD8 T cell recognition of 5T4 in normal human donors and some candidate HLA‐A*0201 epitopes have been identified. © 2006 Wiley‐Liss, Inc.