Induction of antibodies in rhesus macaques that recognize a fusion-intermediate conformation of HIV-1 gp41.

oleh: S Moses Dennison, Laura L Sutherland, Frederick H Jaeger, Kara M Anasti, Robert Parks, Shelley Stewart, Cindy Bowman, Shi-Mao Xia, Ruijun Zhang, Xiaoying Shen, Richard M Scearce, Gilad Ofek, Yongping Yang, Peter D Kwong, Sampa Santra, Hua-Xin Liao, Georgia Tomaras, Norman L Letvin, Bing Chen, S Munir Alam, Barton F Haynes

Format: Article
Diterbitkan: Public Library of Science (PLoS) 2011-01-01

Deskripsi

A component to the problem of inducing broad neutralizing HIV-1 gp41 membrane proximal external region (MPER) antibodies is the need to focus the antibody response to the transiently exposed MPER pre-hairpin intermediate neutralization epitope. Here we describe a HIV-1 envelope (Env) gp140 oligomer prime followed by MPER peptide-liposomes boost strategy for eliciting serum antibody responses in rhesus macaques that bind to a gp41 fusion intermediate protein. This Env-liposome immunization strategy induced antibodies to the 2F5 neutralizing epitope ⁶⁶⁴DKW residues, and these antibodies preferentially bound to a gp41 fusion intermediate construct as well as to MPER scaffolds stabilized in the 2F5-bound conformation. However, no serum lipid binding activity was observed nor was serum neutralizing activity for HIV-1 pseudoviruses present. Nonetheless, the Env-liposome prime-boost immunization strategy induced antibodies that recognized a gp41 fusion intermediate protein and was successful in focusing the antibody response to the desired epitope.