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AIDS pathogenesis: HIV envelope and its interaction with cell proteins.

J A Habeshaw1, A G Dalgleish, L Bountiff

  • 1Retrovirus Research Group, MRC Clinical Research Centre, Harrow, UK.

Immunology Today
|November 1, 1990
PubMed
Summary
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Human immunodeficiency virus (HIV) causes immune deficiency by its outer envelope glycoprotein gp120 interacting with human cells. Modifying gp120 to abolish CD4 binding can enhance immunogenicity for potential HIV vaccines.

Area of Science:

  • Immunology
  • Virology
  • Vaccinology

Background:

  • Human immunodeficiency virus (HIV) infection leads to immune deficiency.
  • The outer envelope glycoproteins gp120/gp41 mediate virus binding to human immunocytes via CD4 and accessory molecules.
  • HIV gp120 and the virus itself suppress T-cell responses and can eliminate antigen responsiveness.

Purpose of the Study:

  • To investigate the immunogenicity of HIV gp120.
  • To explore the role of CD4 binding in HIV-induced immunosuppression.
  • To assess the potential of modified gp120 for HIV vaccination strategies.

Main Methods:

  • Studying T-cell epitopes in gp120 by denaturing gp120 to abolish CD4 binding.
  • Analyzing sequence homology between HIV envelope and human MHC class II molecules.

Related Experiment Videos

  • Hypothesizing HIV envelope as an 'alloepitope' inducing chronic allogeneic responses.

    • Main Results:

    • Denatured gp120, lacking CD4 binding, is highly immunogenic even in naive subjects.
    • HIV envelope shares sequence homology with human MHC class II, potentially acting as an alloepitope.
    • This interaction may induce chronic allogeneic responses similar to graft-versus-host disease (GVHD).

    Conclusions:

    • Effective T-cell responses to gp120 for vaccination require denatured or modified products lacking CD4-binding capacity.
    • Understanding gp120-CD4 interactions and MHC class II homology is crucial for HIV vaccine development.
    • The potential distortion of the T-cell receptor (TCR) repertoire by these sequences needs further assessment.