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In Vitro Assay to Evaluate the Impact of Immunoregulatory Pathways on HIV-specific CD4 T Cell Effector Function
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Published on: October 16, 2013

Circulating CD8 T cells show increased interferon-gamma mRNA expression in HIV infection

E C Breen1, J F Salazar-Gonzalez, L P Shen

  • 1Department of Microbiology and Immunology, University of California, Los Angeles 90095-1747, USA. ebreen@ucla.edu

Cellular Immunology
|May 25, 1997
PubMed

Insights

HIV infection significantly increases interferon-gamma (IFN-gamma) mRNA levels, primarily in CD8 T cells. This elevation correlates with higher viral load and other immune markers in HIV-positive individuals.

Area of Science:

  • Immunology
  • Virology
  • Molecular Biology

Background:

  • Interferon-gamma (IFN-gamma) plays a crucial role in immune responses.
  • HIV infection is known to alter immune cell function and cytokine production.
  • Understanding the cellular source of IFN-gamma in HIV is vital for comprehending disease pathogenesis.

Purpose of the Study:

  • To identify the specific cell types responsible for increased IFN-gamma gene expression in HIV infection.
  • To investigate the relationship between IFN-gamma mRNA levels and viral load in HIV-positive individuals.

Main Methods:

  • Measurement of IFN-gamma mRNA levels in peripheral blood mononuclear cells (PBMC) and purified cell subpopulations.
  • Utilized branched DNA assays for precise quantification.
  • Compared HIV-seropositive (HIV+) subjects with HIV-uninfected (HIV-) subjects.

Main Results:

  • HIV+ subjects exhibited a 2.5-fold increase in mean IFN-gamma mRNA levels in PBMC and CD8 T cells compared to HIV- subjects.
  • CD8 T cells consistently showed the highest IFN-gamma expression across all subjects.
  • Elevated IFN-gamma mRNA in HIV+ individuals correlated with increased plasma levels of HIV RNA, neopterin, and beta 2-microglobulin.
  • No significant differences in IFN-gamma mRNA levels were observed when HIV+ subjects were stratified by CD4 T cell count.

Conclusions:

  • HIV infection enhances IFN-gamma gene expression predominantly within CD8 T cells, rather than recruiting other cell types.
  • Increased IFN-gamma production may be a consequence of, or contribute to, higher viral loads in HIV infection.
  • These findings highlight the specific role of CD8 T cells in IFN-gamma dysregulation during HIV pathogenesis.

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