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Related Experiment Videos

Immunological memory and acquired immunodeficiency syndrome pathogenesis.

A Kaur1, M Rosenzweig, R P Johnson

  • 1Division of Immunology, New England Regional Primate Research Center, Harvard Medical School, Southborough, MA 01772-9102, USA.

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|May 4, 2000
PubMed
Summary

Simian immunodeficiency virus (SIV) infection in macaques severely impairs immunological memory, particularly CD4+ T-cell responses to cytomegalovirus. SIV infection also accelerates T-cell turnover, impacting immune cell populations.

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Area of Science:

  • Immunology
  • Virology
  • Pathogenesis of AIDS

Background:

  • Human immunodeficiency virus (HIV) infection severely disrupts immunological memory, increasing susceptibility to opportunistic infections and Acquired Immunodeficiency Syndrome (AIDS).
  • Understanding the impact of AIDS virus infection on immune memory is crucial for developing effective treatments and prevention strategies.

Purpose of the Study:

  • To investigate the effects of simian immunodeficiency virus (SIV) infection on immunological memory in a rhesus macaque model.
  • To elucidate the impact of SIV on T-cell turnover and immune responses to opportunistic infections like cytomegalovirus (CMV).

Main Methods:

  • Rhesus macaques were infected with SIV to model AIDS virus infection.
  • Immune responses to cytomegalovirus (CMV) were assessed, including CD4+ T-helper, cytotoxic T-lymphocyte, and neutralizing antibody responses.

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  • T-cell turnover was evaluated using bromodeoxyuridine (BrdU) labeling and five-color flow cytometry.

    • Main Results:

    • SIV infection caused significant deficits in CD4+ T-helper responses to CMV, alongside impaired CMV-specific cytotoxic T-lymphocyte and antibody responses.
    • CMV reactivation in SIV-infected macaques correlated with high viral loads and suppressed T-cell responses to CMV.
    • SIV-infected animals exhibited a two- to threefold increase in the labeling and elimination rates of both CD4+ and CD8+ T cells compared to controls.

    Conclusions:

    • SIV infection profoundly affects immunological memory and T-cell dynamics in non-human primates.
    • This model provides valuable insights into AIDS pathogenesis and potential avenues for prevention.
    • Further research in non-human primates can bridge findings from murine models to human AIDS research.