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Electron microscopic analysis of HIV-host cell interactions

J Pudney1, M J Song

  • 1Department of Obstetrics, Gynecology and Reproductive Biology, Brigham and Women's Hospital, Harvard Medical School, Boston, MA 02115.

Tissue & Cell
|August 1, 1994
PubMed
Summary

Human immunodeficiency virus type 1 (HIV-1) can infect cells through specific CD4 binding or non-specific phagocytosis. This dual entry mechanism suggests current HIV-1 therapies targeting CD4 binding may not fully prevent infection.

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Area of Science:

  • Virology
  • Cell Biology
  • Immunology

Background:

  • Human immunodeficiency virus type 1 (HIV-1) is a retrovirus that integrates into the host genome.
  • Viral progeny bud from the host plasma membrane.
  • Critical but understudied periods of HIV-1 interaction are during infection and viral morphogenesis.

Purpose of the Study:

  • To analyze the structural interactions between HIV-1 and host cells during infection and viral shedding.
  • To investigate the mechanisms of HIV-1 entry into host cells.

Main Methods:

  • Conventional Transmission Electron Microscopy (TEM) to observe general entry pathways.
  • Immunogold TEM using anti-gp120 antibody to identify specific viral uptake.
  • High voltage TEM on thick sections for detailed morphological analysis of viral attachment and budding.

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Main Results:

  • HIV-1 can enter host cells via plasma membrane fusion, endocytosis (receptor-mediated and phagocytosis).
  • Immunogold TEM confirmed specific HIV-1 entry via CD4 binding and receptor-mediated endocytosis.
  • High voltage TEM revealed detailed viral attachment and possible macromolecule transport to budding virions.

Conclusions:

  • HIV-1 utilizes multiple infection pathways, including CD4-dependent and CD4-independent (phagocytosis) routes.
  • Vaccines or drugs targeting only specific CD4 entry may be insufficient to block all HIV-1 infections due to non-specific phagocytic entry.