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J. Virol., Nov 1997, 8237-8244, Vol 71, No. 11
N Sol, F Ferchal, J Braun, O Pleskoff, C Treboute, I Ansart and M Alizon
The chemokine receptors CCR-5 and CXCR-4, and possibly CCR-3, are the
principal human immunodeficiency virus type 1 (HIV-1) coreceptors,
apparently interacting with HIV-1 envelope, in association with CD4. Cell
lines coexpressing CD4 and these chemokine receptors were infected with a
panel of seven primary HIV-2 isolates passaged in peripheral blood
mononuclear cells (PBMC) and three laboratory HIV-2 strains passaged in
T-cell lines. The CCR-5, CCR-3, and CXCR-4 coreceptors could all be used by
HIV-2. The ability to use CXCR-4 represents a major difference between
HIV-2 and the closely related simian immunodeficiency viruses. Most HIV-2
strains using CCR-5 could also use CCR-3, sometimes with similar
efficiencies. As observed for HIV-1, the usage of CCR-5 or CCR-3 was
observed principally for HIV-2 strains derived from asymptomatic
individuals, while HIV-2 strains derived from AIDS patients used CXCR-4.
However, there were several exceptions, and the patterns of coreceptor
usage seemed more complex for HIV-2 than for HIV-1. The two T-tropic HIV-2
strains tested used CXCR-4 and not CCR-5, while T-tropic HIV-1 can
generally use both. Moreover, among five primary HIV-2 strains all unable
to use CXCR-4, three could replicate in CCR-5-negative PBMC, which has not
been reported for HIV-1. These observations suggest that the CCR-5
coreceptor is less important for HIV-2 than for HIV-1 and indicate that
HIV-2 can use other cell entry pathways and probably other coreceptors. One
HIV-2 isolate replicating in normal or CCR-5-negative PBMC failed to infect
CXCR-4+ cells or the U87MG-CD4 and sMAGI cell lines, which are permissive
to infection by HIV-2 but not by HIV-1. This suggests the existence of
several HIV-2- specific coreceptors, which are differentially expressed in
cell lines and PBMC.
Copyright © 1997, American Society for Microbiology
Usage of the coreceptors CCR-5, CCR-3, and CXCR-4 by primary and cell line-adapted human immunodeficiency virus type 2
INSERM, Institut Cochin de Genetique Moleculaire, Paris, France.
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