Abstract
Polyclonal anti-idiotypic antibodies were raised in mice against anti-Leu3a, a mouse monoclonal anti-human T4 (CD4) antibody that blocks the in-vitro binding of human immunodeficiency virus (HIV) to the CD4 molecule. The anti-idiotypes recognised anti-Leu3a but not OKT4, an anti-human T4 antibody that does not inhibit HIV binding to CD4. The anti-idiotypes specifically reacted with the HIV envelope glycoprotein in solid-phase immunoassays. More importantly, the anti-idiotypes neutralised three distinct isolates of HIV-1 and one isolate of HIV-2 in a syncytial inhibition assay. These results have implications for a potential AIDS vaccine of anti-CD4 preparations to induce an anti-idiotypic response with the capacity to bind HIV at its receptor site.
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