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Journal of Virology, May 2002, p. 4212-4221, Vol. 76, No. 9
0022-538X/02/$04.00+0     DOI: 10.1128/JVI.76.9.4212-4221.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.

Induction of Long-Term Memory CD8+ T Cells for Recall of Viral Clearing Responses against Influenza Virus

Georgia Deliyannis, David C. Jackson, Nicholas J. Ede, Weiguang Zeng, Irene Hourdakis, Evaline Sakabetis, and Lorena E. Brown*

Cooperative Research Center for Vaccine Technology, Department of Microbiology and Immunology, University of Melbourne, Melbourne, Victoria 3010, Australia

Received 7 August 2001/ Accepted 25 January 2002

Induction of cytotoxic T-cell-mediated virus-clearing responses by influenza virus T cell determinant-containing peptide immunogens was examined. The most potent synthetic immunogens for eliciting pulmonary viral-clearing responses contained peptides representing determinants for CD4 and CD8 T cells (TH and CTL peptides, respectively) together with two or four palmitic acid (Pal) groups. Inoculated in adjuvant, these Pal2- or Pal4-CTL-TH lipopeptides and the nonlipidated CTL peptide induced equivalent levels of cytolytic activity in the primary effector phase of the response. The ability to recall lytic responses, however, diminished much more rapidly in CTL peptide-primed than in lipopeptide-primed mice. By 15 months postpriming, the recalled lytic activity in lipopeptide-inoculated mice remained potent, but the response induced by the CTL peptide was weak. Enumeration of specific gamma interferon-secreting CD8 T cells revealed that a greater number of these T cells had entered or remained in the memory pool in lipopeptide-primed mice, arguing for a quantitative rather than qualitative enhancement of the response on recall. Addition of either the lipid or the TH peptide to the CTL peptide was not sufficient to provide these long-lived antiviral responses, but inclusion of both components augmented the response. CD4 T cells elicited by the lipopeptides did not influence the rate of viral clearance upon challenge and most likely had a role in induction or maintenance of the memory response. It therefore appears that the lipopeptide immunogens, although not significantly superior at inducing primary effector CD8 T cells, elicit a much more effective memory population, the recall of which may account for their superiority in inducing pulmonary protection after viral challenge.

* Corresponding author. Mailing address: Department of Microbiology and Immunology, University of Melbourne, Melbourne, Victoria 3010, Australia. Phone: 61-3-8344-3865. Fax: 61-3-8344-3866. E-mail: lorena{at}unimelb.edu.au.

Journal of Virology, May 2002, p. 4212-4221, Vol. 76, No. 9
0022-538X/02/$04.00+0     DOI: 10.1128/JVI.76.9.4212-4221.2002
Copyright © 2002, American Society for Microbiology. All Rights Reserved.



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