Scientific Publications by FDA Staff

J Med Primatol 2004 Aug;33(4):167-74

Systemic and mucosal immunity in rhesus macaques immunized with HIV-1 peptide and gp120 conjugated to Brucella abortus.

Eller N, Golding H, Inoue S, Beining P, Inman J, Matthews N, Scott DE, Golding B

Golding B, DH, HFM-345,1401 Woodmont,Rockville Pike, Rockville, MD 20852 USA Off Blood Res & Review, Div Hematol, Lab Plasma Derivat, Bethesda, MD USA US FDA, Lab Retrovirus Res, Div Viral Prod, Off Vaccines Res & Review,Ctr Biol Evaluat & Res, Bethesda, MD 20014 USA NIAID, Immunol Lab, NIH, Bethesda, MD 20892 USA

HIV vaccine testing in primates is an important method for determining the possibility of vaccine benefit in humans. Goals of HIV-1 vaccination include establishing neutralizing antibodies and a strong CD8(+) T-cell response. We tested a novel vaccine conjugate for its ability to elicit relevant immune responses to HIV proteins and peptides in rhesus macaques. A neutralizing epitope, V3 loop peptide from HIV-1 envelope, was coupled to heat-inactivated Brucella abortus (V3-HKBA). Rhesus macaques were immunized with this conjugate in the anterior thigh. After two immunizations V3-specific antibodies were found in the sera and at mucosal sites. Neutralizing activity of these antibodies was demonstrated by syncytia inhibition assays. Cellular immune recall responses were demonstrated by antigen-specific induction of interferon-gamma and Regulation on Activation Noraml T Cell Expressed and Secreted (RANTES) secretion in vitro. These results confirm and extend preliminary studies in mice that suggest HKBA is an effective carrier that promotes neutralizing antibody secretion at relevant mucosal sites, as well as cellular immune responses that are correlated with viral protection.