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Related Experiment Videos

Quantitative and qualitative abnormalities in HIV-1-specific T cells.

N Watanabe1, M Tomizawa, A Tachikawa-Kawana

  • 1Division of Infectious Diseases, Advanced Clinical Research Center, University of Tokyo, Tokyo, Japan.

AIDS (London, England)
|May 24, 2001
PubMed
Summary

HIV-1 infection causes quantitative and qualitative abnormalities in CD4 and CD8 T cells specific for HIV-1 and cytomegalovirus (CMV) antigens. Treatment with highly active antiretroviral therapy (HAART) further reduces these vital immune cells.

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Area of Science:

  • Immunology
  • Virology
  • Infectious Diseases

Background:

  • HIV-1 infection significantly impacts the immune system, particularly T cells.
  • Understanding antigen-specific T cell responses is crucial for assessing immune function in HIV-1 patients.

Purpose of the Study:

  • To characterize HIV-1 and cytomegalovirus (CMV)-specific CD4 and CD8 T cells.
  • To compare these T cell populations in untreated versus treated HIV-1-infected individuals.

Main Methods:

  • Antigen-specific T cell frequencies were quantified using flow cytometry.
  • Intracellular cytokine production was measured to identify T cell responses.

Main Results:

  • Untreated patients showed significantly lower HIV-1-specific CD4 T cells compared to CMV-specific CD4 T cells.

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  • HIV-1-specific CD8 T cell counts were similar for both viruses in untreated patients.
  • Highly active antiretroviral therapy (HAART) for less than 1.5 years led to reduced HIV-1-specific CD4 and CD8 T cell counts.
  • HIV-1-specific CD8 T cells exhibited lower perforin expression than CMV-specific CD8 T cells.

    • Conclusions:

    • HIV-1 infection is associated with quantitative and qualitative deficits in HIV-1-specific T cells.
    • These abnormalities persist even with short-term HAART treatment.
    • The findings highlight immune dysregulation in HIV-1-infected individuals.