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Expression of CD69 on T-cell subsets in HIV-1 disease

C Pitsios1, A Dimitrakopoulou, K Tsalimalma

  • 1Department of Immunology, Laiko General Hospital, Athens, Greece. pitsios@yahoo.com

Scandinavian Journal of Clinical and Laboratory Investigation
|October 6, 2007
PubMed

Insights

CD69 expression on T cells is reduced in individuals with AIDS and those not responding to HAART, indicating a specific impact of advanced HIV disease on T cell activation markers. Cytokine production remained unaffected in these groups.

Area of Science:

  • Immunology
  • Virology
  • Cellular Biology

Background:

  • CD69 is a key early activation marker for T lymphocytes.
  • Assessing T cell activation is crucial for understanding immune status in HIV-1 infection.
  • CD69 and CD28 co-expression provides insights into T cell function.

Purpose of the Study:

  • To evaluate CD69 expression on CD4 and CD8 T lymphocytes in HIV-1 infected individuals.
  • To investigate the co-expression of CD69 and CD28 on T cells.
  • To analyze cytokine production in CD69-expressing T cells in response to stimulation.

Main Methods:

  • Whole-blood flow cytometry was employed to measure CD69 and CD28 expression.
  • T cells were stimulated with phytohemagglutinin (PHA) or anti-CD3/CD28 antibodies.
  • Cytokine production (IL-2, IFN-gamma) was assessed in stimulated T cells.

Main Results:

  • Lower CD69 expression on CD4 T cells was observed in AIDS and HAART non-responders compared to controls.
  • A decrease in CD69(+)CD28(+) T cells was noted in AIDS patients post-stimulation.
  • No significant differences in IL-2 or IFN-gamma production were found between HIV-1 positive and healthy individuals.

Conclusions:

  • CD69 expression is significantly affected in the advanced stages of HIV-1 infection (AIDS) and in patients non-responsive to HAART.
  • The observed reduction in CD69 and CD69/CD28 co-expression suggests impaired T cell activation in severe HIV-1 disease.
  • Cytokine production capacity of T cells appears preserved even with altered CD69 expression patterns in HIV-1 infection.

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