Modulation of HIV-1 macrophage-tropism among R5 envelopes occurs before detection of neutralizing antibodies.
Retrovirology
; 7: 48, 2010 May 27.
Article
en En
| MEDLINE
| ID: mdl-20507591
ABSTRACT
HIV-1 R5 viruses vary widely in their capacity to infect primary macrophages. R5 macrophage-tropism is associated with an increased envelopeCD4 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.
Texto completo:
1
Bases de datos:
MEDLINE
Asunto principal:
Anticuerpos Anti-VIH
/
Infecciones por VIH
/
VIH-1
/
Productos del Gen env del Virus de la Inmunodeficiencia Humana
/
Anticuerpos Neutralizantes
/
Tropismo Viral
/
Macrófagos
Tipo de estudio:
Diagnostic_studies
Límite:
Humans
País/Región como asunto:
Europa
Idioma:
En
Revista:
Retrovirology
Asunto de la revista:
VIROLOGIA
Año:
2010
Tipo del documento:
Article
País de afiliación:
Estados Unidos