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Platelet-activating factor: a candidate human immunodeficiency virus type 1-induced neurotoxin
H A Gelbard1, H S Nottet, S Swindells
1Department of Neurology, University of Rochester Medical Center, Rochester, New York 14642.
Journal of Virology
|July 1, 1994
Summary
Platelet-activating factor (PAF) is a neurotoxin produced during HIV-1 infection, causing neuronal death in the central nervous system (CNS). This discovery offers new therapeutic targets for HIV-1-related neurological impairment.
Area of Science:
- Neuroscience
- Immunology
- Virology
Background:
- Human immunodeficiency virus type 1 (HIV-1) infection leads to central nervous system (CNS) disease through productive viral infection of brain macrophages and microglia.
- Neuronal loss in the cortex and subcortical gray matter is associated with HIV-1-infected macrophages, but the precise mechanisms remain unclear.
- Previous studies identified several neurotoxic factors, including tumor necrosis factor alpha, interleukin 1 beta, arachidonic acid metabolites, and platelet-activating factor (PAF), produced by HIV-infected cells.
Purpose of the Study:
- To investigate the role of platelet-activating factor (PAF) in HIV-1-induced central nervous system (CNS) pathology.
- To determine if PAF contributes to neuronal death in the context of HIV-1 infection.
- To explore potential therapeutic interventions targeting PAF-mediated neurotoxicity.
Main Methods:
- Detected PAF production during interactions between HIV-1-infected monocytes and astroglia.
- Measured PAF levels in the cerebrospinal fluid (CSF) of HIV-1-infected patients with CNS dysfunction.
- Assessed the neurotoxic effects of PAF on primary human fetal cortical and rat retinal ganglion neurons in vitro.
- Investigated the neuroprotective potential of N-methyl-D-aspartate receptor antagonists (MK-801, memantine) against PAF-induced neurotoxicity.
Main Results:
- PAF was detected at high levels in the CSF of HIV-1-infected patients exhibiting immunosuppression and CNS dysfunction.
- In vitro, PAF at concentrations ≥ 300 pg/ml induced significant neuronal death in both human and rat neuronal cultures.
- The N-methyl-D-aspartate receptor antagonists MK-801 and memantine partially ameliorated the neurotoxic effects of PAF.
Conclusions:
- Platelet-activating factor (PAF) is identified as a key HIV-1-induced neurotoxin contributing to central nervous system (CNS) pathology.
- PAF-mediated neurotoxicity plays a significant role in the neurological impairment observed in HIV-1-infected individuals.
- Targeting PAF offers a promising therapeutic strategy for ameliorating HIV-1-associated neurological dysfunction.