Dependence of CD8+ T-cell-mediated suppression of HIV type 1 on viral phenotypes and mediation of phenotype-dependent suppression by viral envelope gene and not by beta-chemokines.
AIDS Res Hum Retroviruses 2000;
16:117-24. [PMID:
10659051 DOI:
10.1089/088922200309467]
[Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
CD8+ T-cell-mediated HIV-1 suppressive activity has been shown against a number of strains of HIV-1 and HIV-2. In this study using a semiquantitative assay, we showed that CD8+ T cells from seropositive subjects and herpes virus saimiri transformed CD8+ T-cell clones from HIV-1-infected subjects exhibited 5 to 100-fold higher suppressive activity against slow replicating nonsyncytia-inducing strains (Slow/NSI) as compared to fast replicating syncytia-inducing strains (Fast/SI) of HIV-1. Such differential suppressive activity was not due to beta-chemokines as evidenced by the lack of blocking activity of antibodies to RANTES, MIP-1beta, and MIP-1alpha on the antiviral activities of CD8+ T cells. Moreover, there was no correlation between the level of CD8+ T-cell suppression and the level of these beta-chemokines in culture supernatant. Results from the CD8+ T-cell-mediated suppressive activity against two molecular cloned virus ME1 (Slow/NSI), ME46 (Fast/SI), and their interstrain recombinants indicate that the envelope gene carries a major genetic determinant responsible for this phenotypic-dependent differential suppressive activity.
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