CD4-immunoglobulin G2 protects Hu-PBL-SCID mice against challenge by primary human immunodeficiency virus type 1 isolates

Marie Claire Gauduin, Graham P. Allaway, William C. Olson, Raymond Weir, Paul J. Maddon, Richard A. Koup

    Research output: Contribution to journalArticlepeer-review

    39 Scopus citations

    Abstract

    CD4-immunoglobulin G2 (lgG2) is a fusion protein comprising human IgG2 in which the Fv portions of both heavy and light chains have been replaced by the V1 and V2 domains of human CD4. Previous studies found that CD4-IgG2 potently neutralizes a broad range of primary human immunodeficiency virus type 1 (HIV- 1) isolates in vitro and ex vivo. The current report demonstrates that CD4-IgG2 protects against infection by primary isolates of HIV-1 in vivo, using the hu-PBL-SCID mouse model. Passive administration of 10 mg of CD4-IgG2 per kg of body weight protected all animals against subsequent challenge with 10 mouse infectious doses of the laboratory- adapted T-cell-tropic isolate HIV-l(LAI), while 50 mg of CD4-IgG2 per kg protected four of five mice against the primary isolates HIV-1(JR-CSF) and HIV-l(AD6). In contrast, a polyclonal HIV-1 Ig fraction exhibited partial protection against HIV-1(LAI) at 150 mg/kg but no significant protection against the primary HIV-1 isolates. The results demonstrate that CD4-1gG2 effectively neutralizes primary HIV-1 isolates in vivo and can prevent the initiation of infection by these viruses.

    Original languageEnglish (US)
    Pages (from-to)3475-3478
    Number of pages4
    JournalJournal of virology
    Volume72
    Issue number4
    DOIs
    StatePublished - Apr 1998

    ASJC Scopus subject areas

    • Microbiology
    • Immunology
    • Insect Science
    • Virology

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