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The relationship between AIDS and immunologic tolerance.

H W Sheppard1, M S Ascher

  • 1Division of Laboratories, California Department of Health Services, Berkeley 94704.

Journal of Acquired Immune Deficiency Syndromes
|January 1, 1992
PubMed
Summary
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This study proposes a shared mechanism for acquired immune deficiency syndrome (AIDS) and immune tolerance, linking human immunodeficiency virus (HIV) infection to programmed cell death. HIV disrupts immune regulation by providing a chronic costimulatory signal, leading to T-cell loss.

Area of Science:

  • Immunology
  • Virology
  • Cell Biology

Background:

  • Acquired Immune Deficiency Syndrome (AIDS) involves immunodeficiency and cell loss.
  • Immunologic tolerance is associated with clonal deletion.
  • Human Immunodeficiency Virus (HIV) interaction with CD4 is hypothesized to disrupt immune regulation.

Purpose of the Study:

  • To present a hypothesis for a common mechanism underlying AIDS and immunologic tolerance.
  • To compare HIV infection biology with the "two-signal" molecular mechanism of thymic selection.
  • To propose how chronic HIV infection contributes to programmed cell death in mature lymphocytes.

Main Methods:

  • Comparative analysis of HIV infection and thymic selection mechanisms.
  • Review of "two-signal" molecular activation pathways.

Related Experiment Videos

  • Hypothetical modeling of T-cell population dynamics under HIV influence.

    • Main Results:

    • A proposed common mechanism for AIDS-related immunodeficiency and clonal deletion in tolerance.
    • HIV infection may provide a chronic high-affinity costimulatory signal (signal 2).
    • This chronic signal shifts T-cell populations towards programmed death, causing memory cell deficits.

    Conclusions:

    • HIV-induced chronic signal 2 contributes to gradual clonal deletion in mature lymphocytes.
    • The rate of cell loss depends on antigen exposure frequency and HIV quasispecies.
    • This mechanism offers a unified explanation for immune dysregulation in AIDS and tolerance.