Original antigenic sin impairs cytotoxic T lymphocyte responses to viruses bearing variant epitopes

被引:293
作者
Klenerman, P [1 ]
Zinkernagel, RM [1 ]
机构
[1] Univ Zurich, Inst Expt Immunol, CH-8091 Zurich, Switzerland
关键词
D O I
10.1038/28860
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Some viruses, including human immunodeficiency virus (HIV) and hepatitis B virus (HBV) in humans, and lymphocytic choriomeningitis virus (LCMV) in mice, are initially controlled by cytotoxic T lymphocytes (CTLs), but may subsequently escape through mutation of the relevant T-cell epitope(1-3), Some of these mutations preserve the normal binding to major histocompatibility complex class I molecules, but present an altered surface to the T-cell antigen receptor(4,5). The exact role of these so-called altered peptide ligands in vivo is not clear. Here we report that mice primed with LCMV-WE strain respond to a subsequent infection by WE-derived CTL epitope variants with a CTL response directed against the initial epitope rather than against the new variant epitope, This phenomenon of 'original antigenic sin' was initially described in influenza(6-8) and is an asymmetric pattern of protective antibody crossreactivity determined by exposure to previously existing strains, which may therefore extend to some CTL responses. Original antigenic sin by CTL leads to impaired clearance of variant viruses infecting the same individual and so may enhance the immune escape of mutant viruses evolving in an individual host.
引用
收藏
页码:482 / 485
页数:4
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