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Alterations in intracellular potassium concentration by HIV-1 and SIV Nef

Bongkun Choi1, Cesar D Fermin, Alla M Comardelle

  • 1Department of Microbiology and Immunology, Tulane University Health Sciences Center, New Orleans, LA 70112, USA. choib01@med.nyu.edu

Virology Journal
|May 21, 2008
PubMed
Abstract

Insights

The human immunodeficiency virus type 1 (HIV-1) Nef protein alters intracellular potassium levels in immune cells. Nef does not directly form pores but may indirectly affect ion channels.

Area of Science:

  • Virology
  • Cell Biology
  • Molecular Biology

Background:

  • HIV-1 infection disrupts cell membranes, affecting ion gradients and potentially causing cell death.
  • Specific HIV-1 proteins are known to alter membrane permeability and ion transport.
  • Xenopus laevis oocytes are valuable models for studying protein effects on ion transport due to limited endogenous channels.

Purpose of the Study:

  • To investigate the direct effects of HIV-1 Nef on ion transport and membrane permeability.
  • To determine if Nef induces changes in intracellular ion concentrations or pH.
  • To assess whether Nef forms ion channel-like pores in cell membranes.

Main Methods:

  • Utilized Xenopus laevis oocytes as a model system.
  • Employed two-electrode voltage-clamp recording techniques.
  • Measured intracellular potassium concentration and pH in CD4+ T-lymphoblastoid cells and oocytes.

Main Results:

  • HIV-1 Nef induced significant alterations in intracellular potassium concentration in CD4+ T-lymphoblastoid cells.
  • No significant changes in intracellular pH were observed in response to Nef.
  • Nef did not form ion channel-like pores in the membranes of Xenopus oocytes.

Conclusions:

  • HIV-1 Nef appears to regulate intracellular ion concentrations indirectly.
  • Nef may interact with endogenous membrane proteins, such as ion channels, to modulate their electrical properties.
  • These findings suggest a novel mechanism for HIV-1 pathogenesis involving indirect ion channel modulation.

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