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CD8+ T-cells: function and response to HIV infection.

Naveed Gulzar1, Karen F T Copeland

  • 1Ottawa Health Research Institute, Ottawa, Ontario, Canada.

Current HIV Research
|April 1, 2004
PubMed
Summary

Human Immunodeficiency Virus (HIV) evades CD8+ T-cell responses through multiple strategies, including mutation and MHC-I downregulation. This leads to impaired CD8+ T-cell function, hindering viral control.

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Area of Science:

  • Immunology
  • Virology
  • Cellular Biology

Background:

  • CD8+ T-cells are crucial for controlling viral infections, including HIV.
  • These cytotoxic lymphocytes (CTL) eliminate infected cells via perforin, granzymes, and death receptor pathways.
  • CTLs also secrete factors like beta-chemokines and CD8+ antiviral factor (CAF) to inhibit viral replication.

Purpose of the Study:

  • To investigate the mechanisms by which HIV evades the CD8+ T-cell immune response.
  • To understand how HIV disrupts CD8+ T-cell signaling and function.
  • To elucidate the impact of HIV on the circulating pool of effector and memory CD8+ T-cells.

Main Methods:

  • Analysis of CD8+ T-cell recognition of HIV-infected cells via MHC-I.
  • Investigation of CTL-mediated cell lysis mechanisms.
  • Assessment of soluble factors secreted by CD8+ CTLs.
  • Examination of HIV-induced downregulation of MHC-I expression.
  • Evaluation of HIV's impact on T-cell receptor (TcR) stimulation and CD8+ T-cell signaling.
  • Study of HIV's effects on CD4+ T-cells and antigen-presenting cells.

Main Results:

  • HIV employs high mutation rates to escape CD8+ T-cell recognition.
  • The virus down-regulates MHC-I expression on infected cells.
  • HIV disrupts CD8+ T-cell signaling through altered cytokine production and receptor engagement, leading to anergy.
  • HIV impairs CD4+ T-cell and antigen-presenting cell function, reducing the pool of effective CD8+ T-cells.

Conclusions:

  • HIV actively subverts the CD8+ T-cell immune response through diverse evasion strategies.
  • These strategies result in the functional aberration of CD8+ T-cells, compromising viral control.
  • Understanding these evasion mechanisms is critical for developing effective HIV therapies.

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