Knockout of glutamate transporters reveals a major role for astroglial transport in excitotoxicity and clearance of glutamate

Jeffrey D. Rothstein, Margaret Dykes-Hoberg, Carlos A. Pardo, Lynn A. Bristol, Lin Jin, Ralph W. Kuncl, Yoshikatsu Kanai, Matthias A. Hediger, Yanfeng Wang, Jerry P. Schielke, Devin F. Welty

Research output: Contribution to journalArticle

Abstract

Three glutamate transporters have been identified in rat, including astroglial transporters GLAST and GLT-1 and a neuronal transporter EAAC1. Here we demonstrate that inhibition of the synthesis of each glutamate transporter subtype using chronic antisense oligonucleotide administration, in vitro and in vivo, selectively and specifically reduced the protein expression and function of glutamate transporters. The loss of glial glutamate transporters GLAST or GLT-1 produced elevated extracellular glutamate levels, neurodegeneration characteristic of excitotoxicity, and a progressive paralysis. The loss of the neuronal glutamate transporter EAAC1 did not elevate extracellular glutamate in the striatum but did produce mild neurotoxicity and resulted in epilepsy. These studies suggest that glial glutamate transporters provide the majority of functional glutamate transport and are essential for maintaining low extracellular glutamate and for preventing chronic glutamate neurotoxicity.

Original languageEnglish (US)
Pages (from-to)675-686
Number of pages12
JournalNeuron
Volume16
Issue number3
DOIs
StatePublished - Mar 1996

ASJC Scopus subject areas

  • Neuroscience(all)

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