High-Titer HIV-1 Neutralizing Antibody Response of Rhesus Macaques to gp160 and env Peptides

Jorge Ronco, Jean Francois Dedieu, Francois Noël Marie, Abraham Pinter, Michel Kaczorek, Marc Girard

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Three groups of four rhesus macaques were immunized twice, one month apart with purified recombinant HIV-1LAI gp160 in the presence of either alum, incomplete Freund's adjuvant (IFA), or SAF-1. Two months later, the animals were injected twice again with a synthetic peptide with the sequence of the principal neutralization determinant (PND) of the HIV-1LAI isolate mixed with the same adjuvants. All animals received a booster injection of gp160 and PND peptide at 6 months. This regimen of immunization induced in the SAF-1 and IFA groups a high-titer neutralizing antibody response that declined progressively over the course of the following 6 months. In contrast, only a weak response was observed in the alum group. Neutralizing antibody titers varied as anti-PND titers, suggesting that they were principally targeted to the PND. A shortened immunization protocol comprising two injections of gp160 at 0 and 1 month followed by one injection of PND peptide at 3 months is suggested as optimal for the induction of high titers of HIV-1 neutralizing antibodies in primates.

Original languageEnglish (US)
Pages (from-to)1117-1123
Number of pages7
JournalAIDS research and human retroviruses
Issue number6
StatePublished - Jun 1992
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Immunology
  • Virology
  • Infectious Diseases

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