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HIV infection: first battle decides the war.
Zdenek Hel1, Jerry R McGhee, Jiri Mestecky
1Department of Pathology, University of Alabama at Birmingham, 619 19th Street South, Room SW-W286, Birmingham, AL 35249-7331, USA. zhel@uab.edu
Trends in Immunology
|May 9, 2006
Summary
Human immunodeficiency virus type 1 (HIV-1) rapidly infects and depletes memory CD4+ T cells in mucosal tissues early in infection. This initial immune damage dictates the infection's progression and long-term outcome.
Area of Science:
- Immunology
- Virology
- Pathogenesis
Background:
- The traditional understanding of HIV-1 infection involved a slow decline in CD4+ T cells.
- Recent studies reveal rapid and extensive CD4+ T cell depletion in mucosal tissues within weeks of infection in both macaques and humans.
Purpose of the Study:
- To re-evaluate HIV-1 pathogenesis based on new observations of early CD4+ T cell dynamics.
- To understand the mechanisms and consequences of early CD4+ T cell depletion in HIV-1 infection.
Main Methods:
- Observational studies in rhesus macaques and humans.
- Analysis of CD4+ T cell dynamics during acute, chronic, and advanced HIV-1 infection phases.
Main Results:
- HIV-1 causes rapid and extensive infection and removal of memory CD4+ T cells in mucosal tissues early in infection.
- Different CD4+ T cell depletion mechanisms operate during various infection stages.
- Early elimination of CD4+ T cells impairs immune regulation and pathogen control.
Conclusions:
- The initial strike on mucosal CD4+ T cells is a key feature of HIV-1 pathogenesis.
- Controlling acute viremia limits early damage, promoting a balance for long-term non-progression.