1887

Abstract

Monoclonal antibody (MAb) ICR41.1i (rat IgG2a) is specific for a conformation-dependent epitope of human immunodeficiency virus type 1 (HIV-1) V3, and MAb F58 (mouse IgG1) recognizes the peptide IXXGPGR, at the tip of the V3 loop. Both MAbs neutralized HIV-1 strain IIIB in C8166 and HeLa-T4(CD4) cells. Neutralization by either MAb did not inhibit attachment of virus to target cells as determined by FACS analysis, ELISA or immuno-fluorescence, and such attachment was absolutely dependent on the availability of CD4 molecules. F58 inhibited virus-induced cell-cell fusion, and reduced internalization of virions in direct proportion to neutralization. In contrast, ICR41.1i had no effect on HIV-1-mediated cell fusion or on internalization of virus. It was concluded that MAb F58 neutralized infectivity by inhibiting fusion of the virus with the cell and internalization of the viral core, and that ICR41. 1i neutralized by inhibiting a post-fusion-internalization event. The possible mechanism by which a neutralizing antibody binds to the V3 loop and affects the function(s) of structures inside the virion is discussed. Lastly, post-attachment neutralization (PAN) was investigated. F58 mediated PAN at 21 °C and 35 °C. However, ICR41. 1i gave PAN at 21 °C but not at 35 °C, suggesting that a temperature-dependent event affecting the V3 loop had abrogated neutralization. Overall, it appears that antibodies to different epitopes within the V3 loop neutralize by affecting very different functions of the virus.

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1996-12-01
2024-02-21
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