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. 1990 Oct;87(20):8080–8084. doi: 10.1073/pnas.87.20.8080

The human immunodeficiency virus type 2 vpr gene is essential for productive infection of human macrophages.

N Hattori 1, F Michaels 1, K Fargnoli 1, L Marcon 1, R C Gallo 1, G Franchini 1
PMCID: PMC54896  PMID: 2236020

Abstract

The human immunodeficiency virus (HIV) genetic determinant(s) responsible for tropism in human T cells or macrophages are not well defined. We studied the role of the HIV type 2 (HIV-2) nef and vpr genes in viral tropism. HIV-2 mutants, lacking either vpr or nef genes, or both vpr and nef, were obtained by site-specific mutagenesis of a biologically active HIV-2 proviral clone (HIV-2sbl/isy), which is infectious in both human T cells and macrophages. Viral progeny carrying mutations of nef, vpr, or of both nef and vpr genes replicated more efficiently than the parental virus in primary human peripheral blood cells and in the human Hut 78 T-cell line. In contrast, the HIV-2 nef- mutant infected human macrophages as efficiently as the parental virus, whereas viruses lacking the vpr gene either alone or in conjunction with the lack of the nef gene did not replicate in macrophages. Thus, some lack of nef in HIV-2 enhances viral replication in T cells and does not interfere with viral replication in primary macrophages, whereas vpr is essential for replication of HIV-2 in human macrophages. Because the parental HIV-2sbl/isy cloned virus also infects rhesus macaques, the use in animal studies of these HIV-2 mutants with differences in cell tropism and rates of replication will be highly useful in understanding the mechanism of viral infectivity and possibly pathogenicity in vivo.

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