Altered expressions of glutamate transporter subtypes in rat model of neonatal cerebral hypoxia-ischemia

Shigeru Fukamachi, Akiko Furuta, Tomoaki Ikeda, Tsuyomu Ikenoue, Tsuyoshi Kaneoka, Jeffery D. Rothstein, Toru Iwaki

Research output: Contribution to journalArticle

58 Citations (Scopus)

Abstract

Glutamate transporters are essential for maintaining the extracellular levels of glutamate at synaptic clefts and are regulated developmentally in a subtype-specific manner. We investigated chronological changes of immunoreactivities for glial glutamate transporters GLAST and GLT-1 and a neuronal glutamate transporter, EAAC1, in postnatal 7-day-old rat neocortices and hippocampi at 12, 24, 48 and 72 h after hypoxia-ischemia. Glutamate transporter subtypes are differentially expressed in the ischemic core and the boundary area of the neonatal rat brain with hypoxia-ischemia. Expressions of these glutamate transporters decreased in the ischemic core at 12 h, then immunoreactivities for GLAST and GLT-1 were recovered at the hippocampus. This was accompanied by a GFAP-positive gliosis at 72 h, whereas these immunoreactivities were reduced at the neocortex in the ischemic core. Glial glutamate transporters, especially GLAST, were noted in some astrocytes appearing as apoptosis as well as shrunken pyramidal neurons mainly in the boundary area of the neocortex. Increased perikaryal expression of EAAC1 was associated with that of MAP2 at the border of the boundary area. These temporal and regional expressions of glutamate transporters may contribute towards understanding the excitotoxic cell death mechanism in hypoxic-ischemic encephalopathy during the perinatal period.

Original languageEnglish
Pages (from-to)131-139
Number of pages9
JournalDevelopmental Brain Research
Volume132
Issue number2
DOIs
Publication statusPublished - Dec 31 2001

All Science Journal Classification (ASJC) codes

  • Developmental Neuroscience
  • Developmental Biology

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