Paucity of functional CTL epitopes in the E7 oncoprotein of cervical cancer associated human papillomavirus type 16.

Abstract:

:Many specific antiviral and antitumour immune responses have been attributed to the protective effects of antigen-specific CD8+ cytotoxic T lymphocytes (CTL). Recognition of virus infected or tumour cells by CTL requires presentation of at least one peptide epitope from a virus or tumour-specific antigen by the relevant MHC Class I molecule. Viral genes with mutations which remove CTL epitopes may thus be favoured for survival. Human cervical cancers are caused by papillomavirus infection, and these cancers consistently express the E7 protein of the oncogenic papillomavirus. We therefore investigated the MHC Class I restricted T cell epitopes of the human papillomavirus type 16 E7 oncoprotein using mice of five different genetic backgrounds, and an IFN-gamma ELISPOT assay, to determine the frequency with which MHC Class I epitopes might be expected in this small oncoprotein (98 amino acids). No MHC Class I restricted responses were detected in E7 immunized BALB/c (H-2d), CBA/CaH (H-2 k), FVB/N (H-2q) or A2KbH2b human HLA2.1 transgenic mice. In C57BL/6 J (H-2b) mice, a previously identified single antigenic epitope was detected. Therefore, we conclude that there is a paucity of MHC Class I restricted T cell epitopes in HPV16 E7 protein because of its small size. This might be advantageous to the virus. Furthermore here we present a quick and easy method to exhaustively determine CD8 T cell epitopes in proteins using a unique set of overlapping 8, 9 and 10 mer synthetic peptides.

journal_name

Immunol Cell Biol

authors

Khammanivong V,Liu XS,Liu WJ,Rodda SJ,Leggatt GR,Tindle RW,Frazer IH,Fernando GJ

doi

10.1046/j.1440-1711.2003.01130.x

subject

Has Abstract

pub_date

2003-02-01 00:00:00

pages

1-7

issue

1

eissn

0818-9641

issn

1440-1711

pii

1130

journal_volume

81

pub_type

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