HIF-1α reveals a binding activity to the promoter of iNOS gene after permanent middle cerebral artery occlusion

C. Matrone, G. Pignataro, P. Molinaro, C. Irace, A. Scorziello, G. F. Di Renzo, Lucio Annunziato

Research output: Contribution to journalArticlepeer-review

Abstract

Hypoxia inducible factor (HIF-1)-1α is a specific, oxygen-sensitive protein that regulates the activity of HIF-1, a transcriptional factor that increases after cerebral ischemia and may either promote or prevent neuronal survival. In this study to determine whether the inducible nitric oxide synthase (iNOS) gene containing the sequence of the hypoxia-responsive enhancer (HRE) was an HIF-1 target after cerebral ischemia induced by permanent middle cerebral artery occlusion (pMCAO), electrophoretic mobility shift assay (EMSA) and iNOS western blot analysis were performed in the ischemic core, in the area surrounding the infarct and in the hippocampus ipsilateral and contralateral to the lesion. In addition, both HIF-1α mRNA and protein expression were examined in the ischemic core, in the area surrounding the ischemic core and in the hippocampus ipsilateral to the insult. Our results revealed that pMCAO up-regulates iNOS protein in the ischemic core, in the area surrounding the ischemic core and in the hippocampus ipsilateral to the lesion, and that the activation of iNOS expression is mediated by HIF-1. Moreover, HIF-1α mRNA and protein levels increased in the ischemic core and in the hippocampus ipsilateral to the lesion compared with the levels obtained in the corresponding areas of sham-operated controls or in the contralateral hemisphere. Particularly in the area surrounding the ischemic core, HIF-1α protein accumulated during pMCAO although mRNA did not increase. Our study suggests that the activation of HIF-1 might be involved in the mechanisms whereby iNOS promotes cell survival and/or death after cerebral ischemia.

Original languageEnglish
Pages (from-to)368-378
Number of pages11
JournalJournal of Neurochemistry
Volume90
Issue number2
DOIs
Publication statusPublished - Jul 2004

Keywords

  • Hippocampus
  • Hypoxia inducible factor-1
  • Inducible nitric oxide synthase
  • Inducible nitric oxide synthase promoter
  • Ischemia
  • pMCAO

ASJC Scopus subject areas

  • Biochemistry
  • Cellular and Molecular Neuroscience

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