The Journal of Immunology, Vol 147, Issue 10 3268-3273, Copyright © 1991 by American Association of Immunologists

ARTICLES

Priming of influenza virus-specific cytotoxic T lymphocytes vivo by short synthetic peptides

XM Gao, B Zheng, FY Liew, S Brett and J Tite
Department of Cell Biology, Wellcome Research Labs, Beckenham, Kent, U.K.

Influenza virus-specific CTL were primed in vivo by immunization with short synthetic peptides representing major CTL epitopes from the nucleoprotein of type A influenza virus. The resultant CTL after in vitro boosting of primed spleen cells recognized both virus-infected and peptide-pulsed target cells. The requirement of CD4+ T cell activation was investigated in several ways. First the addition of helper epitopes to the CTL epitope did not enhance CTL generation, suggesting that helper activity was either not limiting or not required. However, in vivo depletion of CD4+ T cells completely inhibited the generation of CTL by peptide immunization. The inclusion of anti-CD4 in the in vitro restimulation with peptide also prevented the generation of CTL, whereas in vitro reactivation of virus immune spleen cells with peptide was not inhibited by anti-CD4. Thus there appears to be heterogeneity in the requirement of CD4+ T cell proliferation in CTL generation. One possibility is that virus infected cells can stimulate higher affinity T cells that are less helper T cell dependent.

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