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Cell death in HIV dementia.

M P Mattson1, N J Haughey, A Nath

  • 1Laboratory of Neurosciences, National Institute on Aging Intramural Research Program, 5600 Nathan Shock Drive, Baltimore, MD 21224, USA. mattsonm@grc.nia.nih.gov

Cell Death and Differentiation
|March 12, 2005
PubMed
Summary

Human immunodeficiency virus type-1 (HIV-1) infection can cause cognitive impairment, or HIV dementia, by releasing viral proteins that trigger neuronal death. Treatments targeting oxidative stress, excitotoxicity, inflammation, and lipid metabolism are being developed.

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Area of Science:

  • Neuroscience
  • Virology
  • Immunology

Background:

  • Human immunodeficiency virus type-1 (HIV-1) infection is associated with cognitive impairment, termed HIV dementia.
  • Neuronal death in specific brain regions like the basal ganglia, cerebral cortex, and hippocampus contributes to this impairment.

Purpose of the Study:

  • To elucidate the mechanisms by which HIV-1 proteins induce neuronal death and cognitive dysfunction.
  • To identify potential therapeutic targets for mitigating HIV-1-associated neurodegeneration.

Main Methods:

  • Investigating the role of viral proteins (gp120, Tat) in neuronal apoptosis and excitotoxicity.
  • Analyzing the impact of viral proteins on cell surface receptors (CXCR4, NMDA receptor), oxidative stress, calcium homeostasis, and mitochondrial function.

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  • Examining the contribution of membrane lipid metabolism and inflammation to neuronal survival in HIV-1 infection.

    • Main Results:

    • HIV-1 does not directly infect neurons; instead, viral proteins from infected cells trigger neuronal death.
    • HIV-1 proteins gp120 and Tat activate cell surface receptors, leading to apoptosis and excitotoxicity.
    • Oxidative stress, altered calcium homeostasis, and mitochondrial dysfunction are key pathways in HIV-1-induced neurotoxicity.

    Conclusions:

    • Therapeutic strategies targeting oxidative stress, excitotoxicity, inflammation, and lipid metabolism show promise for treating HIV-1-associated cognitive impairment.
    • Understanding these molecular mechanisms is crucial for developing effective neuroprotective interventions for HIV-1 patients.