HIV-1 gp120 glycoprotein affects the astrocyte control of extracellular glutamate by both inhibiting the uptake and stimulating the release of the amino acid

Sabino Vesce, Paola Bezzi, Daniela Rossi, Jacopo Meldolesi, Andrea Volterra

Research output: Contribution to journalArticlepeer-review

Abstract

The mechanisms of HIV-1 neurotoxicity remain still undefined although the induction of signalling events and a modest inhibition of glutamate uptake induced by the envelope glycoprotein, gp120, have called attention to astrocytes. Here we demonstrate that the levels at which the viral glycoprotein affects glutamate homeostasis of astrocyte cultures are at least two: not only the inhibition of uptake, due to an effect at site(s) away from the transporters of the amino acid but also a slow stimulation of release. The combination of these two events accounts for a considerable steady increase of the extracellular concentration of the excitatory amino acid which could play an important role in the neurotoxicity often observed in AIDS patients.

Original languageEnglish
Pages (from-to)107-109
Number of pages3
JournalFEBS Letters
Volume411
Issue number1
DOIs
Publication statusPublished - Jul 7 1997

Keywords

  • Astrocyte
  • Glutamate release
  • Glutamate uptake
  • gp120
  • HIV neurotoxicity

ASJC Scopus subject areas

  • Biochemistry
  • Biophysics
  • Molecular Biology

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