Biphasic activation of apoptosis signal-regulating kinase 1-stress-activated protein kinase 1-c-Jun N-terminal protein kinase pathway is selectively mediated by Ca2+-permeable alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionate receptors involving oxidative stress following brain ischemia in rat hippocampus

Quanguang Zhang, Guangyi Zhang, Fanjie Meng, Hui Tian

Research output: Contribution to journalArticle

45 Scopus citations

Abstract

Stress-activated protein kinase/extracellular signal-regulated kinase-1 (SEK1/MKK4) was examined in a rat model of global brain ischemia. Western blot assay showed that SEK1 activation was biphasic in CA1 but not CA3/dentate gyrus. The second activation peak (3 days after ischemia) was prevented by pretreatment with l-naphthyl acetyl spermine (Naspm), a channel blocker of Ca2+-permeable alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionate (AMPA) receptors, or N-acetylcysteine (NAC), a free radical scavenger. Concomitantly, the late activation of apoptosis signal-regulating kinase 1 (ASK1) and c-Jun N-terminal protein kinase (JNK) was also prevented by Naspm or NAC. Moreover, phospho-SEK1 and phospho-JNK co-immunoprecipitated with ASK1 and the bindings peaked at 3 days of reperfusion. Together with previous results, these findings indicate that Ca2+-permeable AMPA receptors are important routes to mediate the late activation of ASK1-SEK1-JNK pathway involving oxidative stress in hippocampal CA1 region after ischemia.

Original languageEnglish (US)
Pages (from-to)51-55
Number of pages5
JournalNeuroscience Letters
Volume337
Issue number1
DOIs
Publication statusPublished - Jan 30 2003
Externally publishedYes

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Keywords

  • Alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionate receptors
  • Apoptosis signal-regulating kinase 1
  • Brain ischemia
  • Hippocampus
  • L-naphthyl acetyl spermine
  • N-acetylcysteine
  • Rat
  • Stress-activated protein kinase-1
  • c-Jun N-terminal protein kinase

ASJC Scopus subject areas

  • Neuroscience(all)

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