Dose–response curve slope helps predict therapeutic potency and breadth of HIV broadly neutralizing antibodies

Nicholas E. Webb, David C. Montefiori () and Benhur Lee ()
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Nicholas E. Webb: Immunology and Molecular Genetics, University of California
David C. Montefiori: Duke University Medical Center
Benhur Lee: Immunology and Molecular Genetics, University of California

Nature Communications, 2015, vol. 6, issue 1, 1-10

Abstract: Abstract A new generation of HIV broadly neutralizing antibodies (bnAbs) with remarkable potency, breadth and epitope diversity has rejuvenated interest in immunotherapeutic strategies. Potencies defined by in vitro IC50 and IC80 values (50 and 80% inhibitory concentrations) figure prominently into the selection of clinical candidates; however, much higher therapeutic levels will be required to reduce multiple logs of virus and impede escape. Here we predict bnAb potency at therapeutic levels by analysing dose–response curve slopes, and show that slope is independent of IC50/IC80 and specifically relates to bnAb epitope class. With few exceptions, CD4-binding site and V3-glycan bnAbs exhibit slopes >1, indicative of higher expected therapeutic effectiveness, whereas V2-glycan, gp41 membrane-proximal external region (MPER) and gp120–gp41 bnAbs exhibit less favourable slopes

Date: 2015
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DOI: 10.1038/ncomms9443

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