The Journal of Experimental Medicine
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© The Rockefeller University Press, 0022-1007/1997/3/909/ $5.00
The Journal of Experimental Medicine, Volume 185, Number 5, March 3, 1997 909-920

Articles

Targeting of HIV-1 Antigens for Rapid Intracellular Degradation Enhances Cytotoxic T Lymphocyte (CTL) Recognition and the Induction of De Novo CTL Responses In Vivo After Immunization

Timothy W. Tobery and Robert F. Siliciano

From the Department of Medicine, The Johns Hopkins University School of Medicine, Baltimore, Maryland 21205

CD8+ cytotoxic T lymphocytes (CTLs) have the ability to recognize and eliminate virally infected cells before new virions are produced within that cell. Therefore, a rapid and vigorous CD8+ CTL response, induced by vaccination, can, in principle, prevent disseminated infection in vaccinated individuals who are exposed to the relevant virus. There has thus been interest in novel vaccine strategies that will enhance the induction of CD8+ CTLs. In this study, we have tested the hypothesis that targeting an antigen to undergo more efficient processing by the class I processing pathway will elicit a more vigorous CD8+ CTL response against that antigen. Targeting a type I transmembrane protein, the HIV-1 envelope (env) protein, for expression in the cytoplasm, rather than allowing its normal co-translational translocation into the endoplasmic reticulum, sensitized target cells expressing this mutant more rapidly for lysis by an env-specific CTL clone. Additionally, a greatly enhanced de novo env-specific CTL response was induced in vivo after immunization of mice with recombinant vaccinia vectors expressing the cytoplasmic env mutant. Similarly, targeting a cytoplasmic protein, HIV-1 nef, to undergo rapid cytoplasmic degradation induced a greatly enhanced de novo nef-specific CD8+ CTL response in vivo after immunization of mice with either recombinant vaccinia vectors or DNA expression plasmids expressing the degradation targeted nef mutant. The targeting of viral antigens for rapid cytoplasmic degradation represents a novel and highly effective vaccine strategy for the induction of enhanced de novo CTL responses in vivo.

Address correspondence to Robert F. Siliciano, Department of Medicine, The Johns Hopkins University School of Medicine, 1049 Ross Research Bldg., 720 Rutland Ave., Baltimore, MD 21205.

1Abbreviations used in this paper: β-gal, β-galactosidase; env, envelope; HA, hemagglutinin; MOI, multiplicity of infection; NP, nucleoprotein; O/N, overnight; SIV, simian immunodeficiency virus; ss–, signal sequence minus; Ub, ubiquitin; vac, vaccinia; wt, wild type.


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