Polyfunctional tier 2-neutralizing antibodies cloned following hiv-1 env macaque immunization mirror native antibodies in a human donor

David A. Spencer, Delphine C. Malherbe, Néstor Vázquez Bernat, Monika Aóori, Benjamin Goldberg, Nicholas Dambrauskas, Heidi Henderson, Shilpi Pandey, Tracy Cheever, Philip Barnette, William F. Sutton, Margaret E. Ackerman, James J. Kobie, D. Noah Sather, Gunilla B.Karlsson Hedestam, Nancy L. Haigwood, Ann Hessell

    Research output: Contribution to journalArticlepeer-review

    Abstract

    Vaccine efforts to combat HIV are challenged by the global diversity of viral strains and shielding of neutralization epitopes on the viral envelope glycoprotein trimer. Even so, the isolation of broadly neutralizing Abs from infected individuals suggests the potential for eliciting protective Abs through vaccination. This study reports a panel of 58 mAbs cloned from a rhesus macaque (Macaca mulatta) immunized with envelope glycoprotein immunogens curated from an HIV-1 clade C-infected volunteer. Twenty mAbs showed neutralizing activity, and the strongest neutralizer displayed 92% breadth with a median IC50 of 1.35 mg/ml against a 13-virus panel. Neutralizing mAbs predominantly targeted linear epitopes in the V3 region in the cradle orientation (V3C) with others targeting the V3 ladle orientation (V3L), the CD4 binding site (CD4bs), C1, C4, or gp41. Nonneutralizing mAbs bound C1, C5, or undetermined conformational epitopes. Neutralization potency strongly correlated with the magnitude of binding to infected primary macaque splenocytes and to the level of Ab-dependent cellular cytotoxicity, but did not predict the degree of Ab-dependent cellular phagocytosis. Using an individualized germline gene database, mAbs were traced to 23 of 72 functional IgHV alleles. Neutralizing V3C Abs displayed minimal nucleotide somatic hypermutation in the H chain V region (3.77%), indicating that relatively little affinity maturation was needed to achieve in-clade neutralization breadth. Overall, this study underscores the polyfunctional nature of vaccine-elicited tier 2-neutralizing V3 Abs and demonstrates partial reproduction of the human donor's humoral immune response through nonhuman primate vaccination.

    Original languageEnglish (US)
    Pages (from-to)999-1012
    Number of pages14
    JournalJournal of Immunology
    Volume206
    Issue number5
    DOIs
    StatePublished - Mar 1 2021

    ASJC Scopus subject areas

    • Immunology and Allergy
    • Immunology

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