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Imaging of HIV-1 Envelope-induced Virological Synapse and Signaling on Synthetic Lipid Bilayers
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Interactions of CD4+ plasma membrane vesicles with HIV-1 and HIV-1 envelope glycoprotein-expressing cells

A Puri1, D S Dimitrov, H Golding

  • 1Section on Membrane Structure and Function, NCI, NIH, Bethesda, Maryland 20892.

Journal of Acquired Immune Deficiency Syndromes
|January 1, 1992
PubMed

Insights

A novel experimental system using CD4-carrying plasma membrane vesicles (CD4 PMVs) effectively studied human immunodeficiency virus type 1 (HIV-1) envelope interactions. These CD4 PMVs showed potential for HIV-1 inactivation and fusion mechanism studies.

Area of Science:

  • Virology
  • Cell Biology
  • Biochemistry

Background:

  • Understanding interactions between the human immunodeficiency virus type 1 (HIV-1) envelope glycoprotein (gp120-gp41) and its target receptor, CD4, is crucial for developing antiviral strategies.
  • Previous methods for studying these interactions have limitations in mimicking the natural cellular environment.

Purpose of the Study:

  • To develop and validate a new experimental system, CD4-carrying plasma membrane vesicles (CD4 PMVs), for studying HIV-1 envelope-receptor interactions.
  • To assess the potential of CD4 PMVs in HIV-1 inactivation and understanding fusion mechanisms.

Main Methods:

  • CD4 PMVs were generated from HeLa cells expressing CD4 via recombinant vaccinia virus infection.
  • Fusion of CD4 PMVs with cells expressing HIV-1 gp120-gp41 was monitored using fluorescence video microscopy and lipophilic fluorescent dyes.
  • The effect of CD4 PMVs on HIV-1 infectivity and syncytia formation was evaluated.

Main Results:

  • CD4 PMVs successfully facilitated the study of HIV-1 envelope-CD4 interactions, with fusion observed within 30 minutes at 37°C.
  • Preincubation with CD4 PMVs reduced HIV-1 infectivity by 10-fold.
  • CD4 PMVs demonstrated superior inhibition of syncytia formation compared to soluble CD4 (sCD4).

Conclusions:

  • CD4 PMVs represent a valuable tool for elucidating the mechanisms of HIV-1 envelope-mediated fusion.
  • The developed CD4 PMV system shows significant potential for the inactivation of HIV-1.

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