Garibal J, Laforge M, Silvestre R, Mouhamad S, Campillo-Gimenez L, Lévy Y, Estaquier J. IL-2 immunotherapy in chronically SIV-infected Rhesus macaques.
Virol J 2012;
9:220. [PMID:
23021024 PMCID:
PMC3499432 DOI:
10.1186/1743-422x-9-220]
[Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2012] [Accepted: 09/14/2012] [Indexed: 11/21/2022] Open
Abstract
Background
Despite inducing a sustained increase in CD4+ T cell counts, intermittent recombinant IL-2 (rIL-2) therapy did not confer a better clinical outcome in HIV-infected patients enrolled in large phase III clinical trials ESPRIT and SILCAAT. Several hypotheses were evoked to explain these discrepancies. Here, we investigated the impact of low and high doses of IL-2 in Rhesus macaques of Chinese origin infected with SIVmac251 in the absence of antiretroviral therapy (ART).
Results
We demonstrated that rIL-2 induced a dose dependent expansion of CD4+ and CD8+ T cells without affecting viral load. rIL-2 increased CD4 and CD8 Treg cells as defined by the expression of CD25highFoxP3+CD127low. We also showed that rIL-2 modulated spontaneous and Fas-mediated CD4+ and CD8+ T cell apoptosis. The higher dose exhibited a dramatic pro-apoptotic effect on both CD4+ and CD8+ T cell populations. Finally, all the animals treated with rIL-2 developed a wasting syndrome in the month following treatment simultaneously to a dramatic decrease of circulating effector T cells.
Conclusion
These data contribute to the understanding of the homeostatic and dosage effects of IL-2 in the context of SIV/HIV infection.
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