Characterization of a thymus-tropic HIV-1 isolate from a rapid progressor: role of the envelope.

Abstract:

:Loss of T cell homeostasis usually precedes the onset of AIDS. We hypothesized that rapid progressors may be transmitted with HIV-1 that is particularly able to perturb T cell homeostasis. To this end, we have tested two transmitted, syncytium-inducing (SI) viral isolates from a rapid progressor in two thymus models. One of the isolates (R3A) exhibited markedly rapid kinetics of replication and thymocyte depletion. These phenotypes mapped to the envelope, as a recombinant NL4-3 virus encoding the R3A envelope had similar phenotypes, even in the absence of nef. Notably, the viruses with high pathogenic activity in the thymus (R3A and NL4-R3A) did not show enhanced replication or cytopathicity in PHA-stimulated PBMCs. Furthermore, NL4-R3A did not enhance replication of the coinfected NL4-3 virus in the thymus, suggesting an intrinsic advantage of the R3A envelope. The R3A envelope showed higher entry activity in infecting human T cells and in depleting CD4+ thymocytes when expressed in trans. These data suggest that SI viruses with unique envelope functions which can overcome barriers to transmission may hasten disease progression by perturbing T cell homeostasis.

journal_name

Virology

journal_title

Virology

authors

Meissner EG,Duus KM,Gao F,Yu XF,Su L

doi

10.1016/j.virol.2004.07.019

subject

Has Abstract

pub_date

2004-10-10 00:00:00

pages

74-88

issue

1

eissn

0042-6822

issn

1096-0341

pii

S0042-6822(04)00490-8

journal_volume

328

pub_type

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