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Interleukin-10-secreting CD4 cells from aged patients with AIDS decrease in-vitro HIV replication and tumour necrosis

Regis M Andrade1, Patrícia G Lima, Renato G S Filho

  • 1Department of Infectious Diseases, Federal University of Rio de Janeiro, Brazil.

AIDS (London, England)
|August 11, 2007
PubMed
Summary

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This summary is machine-generated.

Aging impacts immune responses in AIDS patients. Aged individuals show higher interleukin-10 (IL-10) production, which helps control HIV replication and reduce tumor necrosis factor-alpha (TNF-alpha) but not interferon-gamma (IFN-gamma) levels.

Area of Science:

  • Immunology
  • Virology
  • Gerontology

Background:

  • Age significantly influences immune system function, particularly in individuals with chronic infections like HIV/AIDS.
  • Understanding age-related immune changes is crucial for optimizing treatment strategies in aging populations with HIV.
  • Antiretroviral therapy (ART) effectively manages HIV but does not fully restore age-associated immune dysregulation.

Purpose of the Study:

  • To investigate how age affects immune cell proliferation, cytokine production, and HIV replication in successfully treated AIDS patients.
  • To determine the specific roles of different cytokines, such as IL-10 and IFN-gamma, in age-related immune responses during HIV infection.

Main Methods:

  • Peripheral blood mononuclear cells (PBMC) and CD4 T cells from young and aged HIV-1 infected patients were activated in vitro.

Related Experiment Videos

  • Lymphoproliferation, cytokine secretion (IL-1beta, TNF-alpha, IFN-gamma, IL-10), and HIV-1 replication were measured.
  • Experiments involved CD4 T cell depletion and cytokine blockade to elucidate specific mechanisms.

    • Main Results:

    • Younger AIDS patients exhibited higher lymphoproliferation and pro-inflammatory cytokine (TNF-alpha, IFN-gamma) secretion compared to older patients.
    • Aged patients showed impaired IFN-gamma production and significantly elevated IL-10 levels.
    • Higher IL-10 production in aged patients correlated with reduced in vitro HIV-1 replication, and IL-10 blockade enhanced viral load.
    • Elevated IL-10 in aged individuals suppressed TNF-alpha but did not restore IFN-gamma production.

    Conclusions:

    • Increased IL-10 production in aged AIDS patients plays a key role in controlling HIV replication and suppressing TNF-alpha.
    • Age-related impairment in IFN-gamma production persists despite elevated IL-10.
    • These findings highlight distinct age-dependent immune profiles in HIV infection, impacting viral control mechanisms.