Contribution of virion ICAM-1 to human immunodeficiency virus infectivity and sensitivity to neutralization - PubMed (original) (raw)

Contribution of virion ICAM-1 to human immunodeficiency virus infectivity and sensitivity to neutralization

C D Rizzuto et al. J Virol. 1997 Jun.

Abstract

Incorporation of the intercellular adhesion molecule ICAM-1 into human immunodeficiency virus type 1 (HIV-1) particles increased virus infectivity on peripheral blood mononuclear cells (PBMCs) by two- to sevenfold. The degree of ICAM-1-mediated enhancement was greater for viruses bearing envelope glycoproteins derived from primary HIV-1 isolates than for those bearing envelope glycoproteins from laboratory-adapted strains. Treatment of target PBMCs with an antibody against LFA-1, a principal ICAM-1 receptor, was able to nullify the ICAM-1-mediated enhancement. The incorporation of ICAM-1 rendered HIV-1 virions less susceptible to neutralization by a monoclonal antibody directed against the viral envelope glycoproteins. Surprisingly, an antibody against ICAM-1 completely neutralized infection by ICAM-1-containing viruses, reducing the efficiency of virus entry by almost 100-fold. Thus, HIV-1 neutralization by an ICAM-1-directed antibody involves more than an inhibition of the contribution of ICAM-1 to virus entry.

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