Tumor necrosis factor α inhibits glutamate uptake by primary human astrocytes. Implications for pathogenesis of HIV-1 dementia

Steven M. Fine, Robert A. Angel, Seth W. Perry, Leon G. Epstein, Jeffrey D. Rothstein, Stephen Dewhurst, Harris A. Gelbard

Research output: Contribution to journalArticle

Abstract

Human immunodeficiency virus (HIV) infection is commonly associated with neurological disease that occurs in the apparent absence of extensive infection of brain cells by HIV, suggesting that indirect mechanisms account for neuropathogenesis in the CNS, perhaps including changes in the normal neuroprotective functions of astrocytes. To test this hypothesis, we examined the effect of the pro-inflammatory cytokine, tumor necrosis factor α (TNFα), produced by HIV-1-infected macrophages and microglia, on glutamate transport by primary human fetal astrocytes (PHFAs). A dose-dependent inhibition of high affinity glutamate uptake sites was observed 12-24 h after addition of exogenous recombinant human TNFα to PHFAs. This effect was specific since it was blocked by a neutralizing monoclonal antibody directed against TNFα. Furthermore, the inhibitory effect was reproduced by a monoclonal antibody that is an agonist at the 55-kDa TNF receptor. These results suggest that the neurotoxic effects of TNFα may be due in part to its ability to inhibit glutamate uptake by astrocytes, which in turn may result in excitotoxic concentrations of glutamate in synapses.

Original languageEnglish (US)
Pages (from-to)15303-15306
Number of pages4
JournalJournal of Biological Chemistry
Volume271
Issue number26
DOIs
StatePublished - Jul 16 1996

ASJC Scopus subject areas

  • Biochemistry
  • Molecular Biology
  • Cell Biology

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