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CD4 expression and function in HLA class II-specific T cells.

W E Biddison1, S Shaw

  • 1Molecular Immunology Section, National Institute of Neurological Disorders and Stroke, Bethesda, MD 20892.

Immunological Reviews
|June 1, 1989
PubMed
Summary
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The CD4 molecule is crucial for T-cell recognition of class II antigens. Its function is most significant in low-avidity interactions and primarily occurs post-adhesion during cytotoxic T-cell responses.

Area of Science:

  • Immunology
  • Molecular Biology

Background:

  • The CD4 molecule is vital for T-cell function and implicated in HIV infection.
  • Understanding CD4 expression and function is key in immunology.

Purpose of the Study:

  • To investigate the role of CD4 expression and function in class II-specific T cells.
  • To elucidate CD4's involvement in T-cell proliferation and cytotoxicity.

Main Methods:

  • Studied CD4 expression on class II-specific T cells.
  • Assessed CD4's role in T-cell proliferation and cytotoxic function.
  • Examined CD4's importance in varying avidity T-cell interactions.

Main Results:

  • CD4 expression marks T cells committed to class II antigen recognition, including cytotoxic variants.

Related Experiment Videos

  • CD4 is involved in T-cell proliferation and cytotoxicity, potentially via interaction with nonpolymorphic class II determinants.
  • CD4's role is most prominent in low-avidity T-cell interactions.
  • CD4's primary function appears to be in the post-adhesion phase of cytotoxic T-cell recognition, beyond simple adhesion.

    • Conclusions:

    • CD4 is a key marker and functional molecule for class II-specific T cells.
    • CD4's influence on T-cell function is context-dependent, particularly in low-avidity interactions and post-adhesion events.