TY - JOUR
T1 - HIV-1 vaccine-induced C1 and V2 Env-specific antibodies synergize for increased antiviral activities
AU - Pollara, Justin
AU - Bonsignori, Mattia
AU - Moody, M. Anthony
AU - Liu, Pinghuang
AU - Alam, S. Munir
AU - Hwang, Kwan Ki
AU - Gurley, Thaddeus C.
AU - Kozink, Daniel M.
AU - Armand, Lawrence C.
AU - Marshall, Dawn J.
AU - Whitesides, John F.
AU - Kaewkungwal, Jaranit
AU - Nitayaphan, Sorachai
AU - Pitisuttithum, Punnee
AU - Rerks-Ngarm, Supachai
AU - Robb, Merlin L.
AU - O'Connell, Robert J.
AU - Kim, Jerome H.
AU - Michael, Nelson L.
AU - Montefiori, David C.
AU - Tomaras, Georgia D.
AU - Liao, Hua Xin
AU - Haynes, Barton F.
AU - Ferrari, Guido
PY - 2014/7
Y1 - 2014/7
N2 - The RV144 ALVAC/AIDSVax HIV-1 vaccine clinical trial showed an estimated vaccine efficacy of 31.2%. Viral genetic analysis identified a vaccine-induced site of immune pressure in the HIV-1 envelope (Env) variable region 2 (V2) focused on residue 169, which is included in the epitope recognized by vaccinee-derived V2 monoclonal antibodies. The ALVAC/AIDSVax vaccine induced antibody-dependent cellular cytotoxicity (ADCC) against the Env V2 and constant 1 (C1) regions. In the presence of low IgA Env antibody levels, plasma levels of ADCC activity correlated with lower risk of infection. In this study, we demonstrate that C1 and V2 monoclonal antibodies isolated from RV144 vaccinees synergized for neutralization, infectious virus capture, and ADCC. Importantly, synergy increased the HIV-1 ADCC activity of V2 monoclonal antibody CH58 at concentrations similar to that observed in plasma of RV144 vaccinees. These findings raise the hypothesis that synergy among vaccine-induced antibodies with different epitope specificities contributes to HIV-1 antiviral antibody responses and is important to induce for reduction in the risk of HIV-1 transmission.
AB - The RV144 ALVAC/AIDSVax HIV-1 vaccine clinical trial showed an estimated vaccine efficacy of 31.2%. Viral genetic analysis identified a vaccine-induced site of immune pressure in the HIV-1 envelope (Env) variable region 2 (V2) focused on residue 169, which is included in the epitope recognized by vaccinee-derived V2 monoclonal antibodies. The ALVAC/AIDSVax vaccine induced antibody-dependent cellular cytotoxicity (ADCC) against the Env V2 and constant 1 (C1) regions. In the presence of low IgA Env antibody levels, plasma levels of ADCC activity correlated with lower risk of infection. In this study, we demonstrate that C1 and V2 monoclonal antibodies isolated from RV144 vaccinees synergized for neutralization, infectious virus capture, and ADCC. Importantly, synergy increased the HIV-1 ADCC activity of V2 monoclonal antibody CH58 at concentrations similar to that observed in plasma of RV144 vaccinees. These findings raise the hypothesis that synergy among vaccine-induced antibodies with different epitope specificities contributes to HIV-1 antiviral antibody responses and is important to induce for reduction in the risk of HIV-1 transmission.
UR - http://www.scopus.com/inward/record.url?scp=84904113226&partnerID=8YFLogxK
U2 - 10.1128/JVI.00156-14
DO - 10.1128/JVI.00156-14
M3 - Article
C2 - 24807721
AN - SCOPUS:84904113226
SN - 0022-538X
VL - 88
SP - 7715
EP - 7726
JO - Journal of Virology
JF - Journal of Virology
IS - 14
ER -