title: High-titer HIV-1 neutralizing antibody response of rhesus macaques to gp160 and env peptides.
abstract: 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.
authors.affiliation: Pasteur Mérieux Sérums & Vaccins, Parc Industriel d'Incarville, Val de Reuil, France.
authors.forename: J
authors.initials: J
authors.lastname: Ronco
authors.forename: J F
authors.initials: JF
authors.lastname: Dedieu
authors.forename: F N
authors.initials: FN
authors.lastname: Marie
authors.forename: A
authors.initials: A
authors.lastname: Pinter
authors.forename: M
authors.initials: M
authors.lastname: Kaczorek
authors.forename: M
authors.initials: M
authors.lastname: Girard
mesh_terms: D000276:Adjuvants, Immunologic; D000595:Amino Acid Sequence; D000818:Animals; D005620:Freund's Adjuvant / Q000276:immunology; D015686:Gene Products, env / Q000276:immunology*; D015483:HIV Antibodies / Q000096:biosynthesis*; D015699:HIV Envelope Protein gp120 / Q000276:immunology*; D019302:HIV Envelope Protein gp160; D015497:HIV-1 / Q000276:immunology*; D007114:Immunization; D007700:Kinetics; D008253:Macaca mulatta; D008969:Molecular Sequence Data; D009500:Neutralization Tests; D010446:Peptide Fragments / Q000276:immunology*; D011498:Protein Precursors / Q000276:immunology*
chemical_list: D000276:Adjuvants, Immunologic; D015686:Gene Products, env; D015483:HIV Antibodies; D015699:HIV Envelope Protein gp120; D019302:HIV Envelope Protein gp160; C059762:HIV envelope protein gp120 (305-321); D010446:Peptide Fragments; D011498:Protein Precursors; D005620:Freund's Adjuvant