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Phagosome Migration and Velocity Measured in Live Primary Human Macrophages Infected with HIV-1
07:32

Phagosome Migration and Velocity Measured in Live Primary Human Macrophages Infected with HIV-1

Published on: September 5, 2016

HIV entry in macrophages is dependent on intact lipid rafts

Gemma C Carter1, Laura Bernstone, Dhaval Sangani

  • 1Sir William Dunn School of Pathology, University of Oxford, South Parks Road, Oxford OX1 3RE, UK.

Virology
|February 3, 2009
PubMed

Insights

Disrupting cholesterol in macrophage membranes significantly inhibits HIV-1 entry and replication. Restoring cholesterol reverses this effect, implicating cholesterol and lipid rafts in the HIV entry process.

Area of Science:

  • Virology
  • Cell Biology
  • Immunology

Background:

  • Macrophages are key targets for HIV-1 infection.
  • Mechanisms of HIV-1 entry into macrophages are not fully understood.
  • The role of membrane cholesterol and lipid rafts in this process is unknown.

Purpose of the Study:

  • To investigate the role of membrane cholesterol and lipid rafts in HIV-1 entry into macrophages.
  • To determine if cholesterol disruption affects HIV-1 replication in macrophages.

Main Methods:

  • Macrophages were treated with four cholesterol-disrupting agents (methyl-beta cyclodextrin, nystatin, filipin complex, Lovastatin).
  • HIV-1 entry, reverse transcription, and virus release were measured.
  • Receptor expression (CD4, CCR5) and co-localization with lipid raft markers were analyzed.

Main Results:

  • Cholesterol disruption significantly inhibited HIV-1 entry and reverse transcription.
  • Inhibitory effects were reversible with cholesterol addition.
  • HIV-1 binding was unaffected, but receptor expression decreased.
  • HIV particles co-localized with lipid raft markers.

Conclusions:

  • Macrophage membrane cholesterol is essential for efficient HIV-1 entry.
  • Lipid rafts are involved in the HIV-1 entry pathway into macrophages.
  • Targeting membrane cholesterol may offer a novel therapeutic strategy against HIV-1.

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