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Volume 81, Issue 12

T-tropic human immunodeficiency virus (HIV) type 1 Nef protein enters human monocyte–macrophages and induces resistance to HIV replication: a possible mechanism of HIV T-tropic emergence in AIDS Free

Abstract

Increasing interest has been devoted to the role that monocyte–macrophages play in the pathogenesis of AIDS. The hypothesis of an involvement in AIDS pathogenesis of human/simian immunodeficiency virus (HIV/SIV) Nef also is currently under evaluation by many investigators. The original basis of this hypothesis came from evidence that monkeys infected with a -deleted SIV strain failed to develop simian AIDS. Here, we show that treatment of human monocyte-derived macrophages (MDM) with recombinant HIV-1 Nef protein (rNef) induces a strong inhibition of the replication of either macrophage (M-) or dual-tropic HIV-1 strains. Through cytofluorimetric analyses, we detected internalization of FITC-conjugated rNef in MDM as early as 6 h after treatment. Confocal microscope observations demonstrated that the intracellular distribution of internalized rNef was identical to that of endogenously produced Nef. Down-regulation of the CD4 HIV receptor detected upon rNef treatment of MDM suggested that the rNef-induced HIV inhibition occurred at the virus entry step. This deduction was strengthened by the observation that CD4-independent infection was totally insensitive to rNef treatment. The specificity of all observed effects was demonstrated by immunodepletion of rNef. Finally, we showed that the resistance to HIV replication induced by rNef treatment in MDM favours the spread of T-tropic over M-tropic HIV strains in doubly infected CD4 lymphocyte–MDM co-cultures. We propose that extracellular Nef contributes to AIDS pathogenesis by inducing resistance to M-tropic HIV replication in MDM, thereby facilitating the switching from M- to T-tropic HIV prevalence that correlates frequently with AIDS progression.

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2000-12-01
2024-04-25
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T-tropic human immunodeficiency virus (HIV) type 1 Nef protein enters human monocyte–macrophages and induces resistance to HIV replication: a possible mechanism of HIV T-tropic emergence in AIDS
J. Gen. Virol. 81, 2905 (2000); https://doi.org/10.1099/0022-1317-81-12-2905
/content/journal/jgv/10.1099/0022-1317-81-12-2905
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