The Journal of Experimental Medicine
VeriKine-HS Human IFN-Beta
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© The Rockefeller University Press, 0022-1007/1997/10/1365/ $5.00
The Journal of Experimental Medicine, Volume 186, Number 8, October 20, 1997 1365-1372


Articles

Interleukin-1β Converting Enzyme–like Protease Involvement in Fas-induced and Activation-induced Peripheral Blood T Cell Apoptosis in HIV Infection. TNF-related Apoptosis-inducing Ligand Can Mediate Activation-induced T Cell Death in HIV Infection

Peter D. Katsikis*, Marcos E. Garcia-Ojeda*, Javier F. Torres-Roca*, Iwan M. Tijoe*, Craig A. Smith{ddagger}, Leonore A. Herzenberg*, and Leonard A. Herzenberg*

From the * Department of Genetics, Beckman Center B007, Stanford University School of Medicine, Stanford, California 94305; and the {ddagger} Immunex Research and Development Corporation, Seattle, Washington 98101

Apoptosis of peripheral blood T cells has been suggested to play an important role in the pathogenesis of human immunodeficiency virus (HIV) infection. Spontaneous, Fas (CD95)–induced and activation-induced T cell apoptosis have all been described in peripheral blood mononuclear cell cultures of HIV-infected individuals. We have previously shown that activation-induced T cell apoptosis is Fas independent in peripheral blood T cells from HIV+ individuals. In this study, we extend and confirm these observations by using an inhibitor of interleukin-1β converting enzyme (ICE) homologues. We show that z-VAD-fmk, a tripeptide inhibitor of ICE homologues, can inhibit Fas-induced apoptosis of peripheral blood CD4+ and CD8+ T cells from asymptomatic HIV+ individuals. z-VAD-fmk also inhibited activation (anti-CD3)– induced CD4+ and CD8+ T cell apoptosis (AICD) in some but not all asymptomatic HIV+ individuals. Apoptosis was measured by multiparameter flow cytometry. The z-VAD-fmk inhibitor also enhanced survival of T cells in anti-Fas or anti-CD3 antibody-treated cultures and inhibited DNA fragmentation. AICD that could be inhibited by z-VAD-fmk was Fas independent and could be inhibited with a blocking monoclonal antibody to tumor necrosis factor–related apoptosis-inducing ligand (TRAIL), a recently described member of the TNF/nerve growth factor ligand family. The above findings show that Fas-induced T cell apoptosis is ICE dependent in HIV infection. AICD can be blocked by ICE inhibitors in some patients, and this AICD is mediated by TRAIL. These results show that TRAIL can be a mediator of AICD in T cells. These different mechanisms of peripheral blood T cell apoptosis may play different roles in the pathogenesis of HIV infection.


Address correspondence to Peter D. Katsikis, Department of Genetics, Beckman Center B007, Stanford University School of Medicine, Stanford, CA 94305. Phone: 415-723-5054; FAX: 415-725-8564; E-mail: katsikis{at}auhs.edu

M.E. Garcia-Ojeda was supported by a National Science Foundation fellowship. J.F. Torres-Roca was supported by Stanford Immunology Training grant AI-07290. This work was supported by National Institutes of Health grants CA 42509, LM 04836, and AI 31770, and a grant from the Unicorn Foundation.

1 Abbreviations used in this paper: AICD, activation-induced cell death; FasL, Fas ligand; ICE, IL-1β converting enzyme; NGF, nerve growth factor; TRAIL, TNF-related apoptosis-inducing ligand.


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