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Related Experiment Videos

HIV induces modulation of functionally important cellular antigens.

M Wrightham1, A Schimpf, T H Pennington

  • 1Department of Microbiology, University of Nottingham, UK.

Clinical and Experimental Immunology
|July 1, 1991
PubMed
Summary

HIV-1 infection alters T cell antigen expression, increasing intercellular adhesion receptor LFA-1 (CD11a/CD18) and HLA-DR while decreasing CD7. These changes, specific to the virus isolate, impact HIV pathogenesis.

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Area of Science:

  • Immunology
  • Virology
  • Cell Biology

Background:

  • Human Immunodeficiency Virus type 1 (HIV-1) infects T lymphocytes, crucial components of the immune system.
  • Understanding how HIV-1 alters cellular functions is key to comprehending viral pathogenesis and developing treatments.

Purpose of the Study:

  • To investigate the modulation of cellular antigen expression in T lymphoblastoid CEM cells following HIV-1 infection.
  • To determine the role of specific viral isolates and components in these phenotypic changes.

Main Methods:

  • Infection of CEM cells with HIV-1 isolates (IIIB and CBL-1).
  • Immunocytochemical techniques to detect and quantify cellular antigens (CD4, LFA-1, HLA-DR, CD7).
  • Treatment of uninfected cells with recombinant viral proteins (gp120, p24).

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Main Results:

  • HIV-1 IIIB isolate infection induced LFA-1 (CD11a/CD18) and HLA-DR expression in cytoplasm and on cell surface.
  • HIV-1 IIIB isolate infection down-regulated CD7 antigen expression, making it undetectable.
  • Phenotypic changes were dependent on the HIV-1 isolate and not replicated by exogenous gp120 or p24.

Conclusions:

  • HIV-1 infection significantly alters T cell surface antigen expression, affecting immune cell interactions.
  • The observed modulation of LFA-1 and CD7 may contribute to HIV pathogenesis and immune dysfunction.
  • Virus isolate-specific effects highlight the complexity of HIV-1-host cell interactions.