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Infection and entry of CD4(+) cells by human immunodeficiency virus type 1 (HIV-1) requires a coreceptor molecule, which, in concert with CD4, interacts with the viral envelope glycoprotein (Env), leading to membrane fusion. The principal coreceptors are the CCR5 and CXCR4 chemokine receptors. The suppressive effect of beta-chemokines, principally RANTES, on certain HIV-1 isolates was established before the discovery of the CCR5 receptor, and there have since been multiple reports confirming this initial observation. However, the inhibitory effect of beta-chemokines on HIV-1 infection of macrophages has been controversial. The current study focused on this issue in detail, with a reductionist approach, using assays that measure the effect of beta-chemokines solely on Env-mediated fusion. It is shown that under a variety of culture and differentiation conditions, RANTES maintains a significant and consistent inhibitory effect on CCR5-dependent Env-mediated fusion, and the role of these findings is discussed in relation to the role of beta-chemokines in HIV pathogenesis.

the journal of infectious diseases (online. university of chicago press)/the journal of infectious diseases

Consistent and Significant Inhibition of Human Immunodeficiency Virus Type 1 Envelope–Mediated Membrane Fusion by β‐Chemokines (RANTES) in Primary Human Macrophages