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HIV-1 transgenic rats develop T cell abnormalities.

William Reid1, Sayed Abdelwahab, Mariola Sadowska

  • 1Division of Basic Science, University of Maryland, Baltimore, MD 21201, USA. reid@umbi.umd.edu

Virology
|March 23, 2004
PubMed
Summary
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HIV-1 transgenic rats exhibit impaired T cell function, including reduced IFN-gamma production and increased T cell apoptosis. These findings suggest the HIV transgene disrupts T cell effector function and memory cell generation.

Area of Science:

  • Immunology
  • Virology
  • Transgenic animal models

Background:

  • Human Immunodeficiency Virus type 1 (HIV-1) infection causes significant T cell dysfunction.
  • Key defects include impaired T cell proliferation, increased apoptosis, and altered T helper 1 (Th1) responses.

Purpose of the Study:

  • To investigate T cell impairments in HIV-1 transgenic (Tg) rats.
  • To determine if similar defects observed in HIV-1 infected humans are recapitulated in this animal model.

Main Methods:

  • Comparison of T cell populations between HIV-1 Tg rats and non-Tg controls.
  • Analysis of T cell proliferation and apoptosis following activation.
  • Flow cytometry to assess CD4+ and CD8+ T cell subsets (effector/memory vs. naïve).

Related Experiment Videos

Main Results:

  • Tg rats showed an absolute reduction in IFN-gamma producing CD4+ and CD8+ T cells.
  • T cells from Tg rats exhibited increased susceptibility to activation-induced apoptosis.
  • Effector/memory T cell pools (CD45RC- CD62L-) were smaller in Tg rats, while naïve T cell pools (CD45RC+ CD62L+) were larger.

Conclusions:

  • The HIV transgene induces defects in T cell effector function and the generation of specific effector/memory T cell subsets.
  • Activation-induced apoptosis appears to be a critical mechanism contributing to these T cell impairments in Tg rats.