HIV-1 entry and trans-infection of astrocytes involves CD81 vesicles

PLoS One. 2014 Feb 28;9(2):e90620. doi: 10.1371/journal.pone.0090620. eCollection 2014.

Abstract

Astrocytes are extensively infected with HIV-1 in vivo and play a significant role in the development of HIV-1-associated neurocognitive disorders. Despite their extensive infection, little is known about how astrocytes become infected, since they lack cell surface CD4 expression. In the present study, we investigated the fate of HIV-1 upon infection of astrocytes. Astrocytes were found to bind and harbor virus followed by biphasic decay, with HIV-1 detectable out to 72 hours. HIV-1 was observed to associate with CD81-lined vesicle structures. shRNA silencing of CD81 resulted in less cell-associated virus but no loss of co-localization between HIV-1 and CD81. Astrocytes supported trans-infection of HIV-1 to T-cells without de novo virus production, and the virus-containing compartment required 37°C to form, and was trypsin-resistant. The CD81 compartment observed herein, has been shown in other cell types to be a relatively protective compartment. Within astrocytes, this compartment may be actively involved in virus entry and/or spread. The ability of astrocytes to transfer virus, without de novo viral synthesis suggests they are capable of sequestering and protecting virus and thus, they could potentially facilitate viral dissemination in the CNS.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Astrocytes / metabolism*
  • Astrocytes / virology
  • Cell Line
  • Coculture Techniques
  • HEK293 Cells
  • HIV-1 / metabolism*
  • HIV-1 / physiology
  • Host-Pathogen Interactions
  • Humans
  • Microscopy, Fluorescence
  • Protein Binding
  • RNA Interference
  • T-Lymphocytes / virology
  • Temperature
  • Tetraspanin 28 / genetics
  • Tetraspanin 28 / metabolism*
  • Time Factors
  • Transport Vesicles / metabolism
  • Virus Internalization*
  • Virus Replication

Substances

  • Tetraspanin 28

Grants and funding

This work was supported by funding from the Australian National Health and Medical Research Council (NHMRC) to MJC (APP#1051093). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.