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Exogenous, TAP‐independent lysosomal presentation of a respiratory syncytial virus CTL epitope
Author(s) -
Johnstone Carolina,
Ramos Manuel,
GarcíaBarreno Blanca,
López Daniel,
Melero José A,
Del Val Margarita
Publication year - 2012
Publication title -
immunology and cell biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.999
H-Index - 104
eISSN - 1440-1711
pISSN - 0818-9641
DOI - 10.1038/icb.2012.43
Subject(s) - virology , epitope , biology , cytotoxic t cell , virus , mhc class i , major histocompatibility complex , vaccinia , immunogenicity , antigen , antigen presentation , antigen processing , immune system , ctl* , cd8 , immunology , t cell , recombinant dna , in vitro , gene , biochemistry
Respiratory syncytial virus causes lower respiratory tract infections in infancy and old age, affecting also immunocompromised patients. The viral fusion protein is an important vaccine candidate eliciting antibody and cell‐mediated immune responses. CD8 + cytotoxic T lymphocytes (CTLs) are known to have a role in both lung pathology and viral clearance. In BALB/c mice, the fusion protein epitope F249‐258 is presented to CTLs by the murine major histocompatibility complex (MHC) class I molecule K d . In cells infected with recombinant vaccinia viruses encoding the fusion protein, F249‐258 is presented by MHC class I molecules through pathways that are independent of the transporters associated with antigen processing (TAP). We have now found that F249‐258 can be generated from non‐infectious virus from an exogenous source. Antigen processing follows a lysosomal pathway that appears to require autophagy. As a practical consequence, inactivated virus suffices for in vivo priming of virus‐specific CTLs.