Affordable Access

Publisher Website

Modulation of HIV-1 macrophage-tropism among R5 envelopes occurs before detection of neutralizing antibodies

Authors
Journal
Retrovirology
1742-4690
Publisher
Springer (Biomed Central Ltd.)
Publication Date
Volume
7
Issue
1
Identifiers
DOI: 10.1186/1742-4690-7-48
Keywords
  • Short Report

Abstract

HIV-1 R5 viruses vary widely in their capacity to infect primary macrophages. R5 macrophage-tropism is associated with an increased envelope:CD4 affinity that partly results from an increased exposure of CD4 contact residues on gp120 and allows the use of low levels of CD4 for infection. The selective pressures in vivo that modulate R5 macrophage-tropism are not understood. It is possible that different R5 variants adapt for replication in either T-cells (high CD4) or in macrophages (low CD4). However, other selective pressures in vivo (e.g. neutralizing antibodies) may also impact R5 tropism. Here, we measured macrophage infectivity conferred by gp120 sequences amplified sequentially from subjects in London followed from the acute stage of infection. We report wide variation in the capacity of these envelopes to confer macrophage infection in the complete absence of both autologous and heterologous neutralizing antibodies. Our data show that the variation in macrophage tropism observed at early times cannot have been influenced by neutralizing antibodies.

There are no comments yet on this publication. Be the first to share your thoughts.