Serial expression of hypoxia inducible factor-1α and neuronal apoptosis in hippocampus of rats with chronic ischemic brain

Chi Ho Yu, Chang Taek Moon, Jung Hyang Sur, Young Il Chun, Won Ho Choi, Ji Young Yhee

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11 Scopus citations

Abstract

Objective. The purpose of this study is to investigate serial changes of hypoxia-inducible factor 1α (HIF-1α), as a key regulator of hypoxic ischemia, and apoptosis of hippocampus induced by bilateral carotid arteries occlusion (BCAO) in rats. Methods. Adult male Wistar rats were subjected to the permanent BCAO. The time points studied were 1, 2, 4, 8, and 12 weeks after occlusions, with n=6 animals subjected to BCAO, and n=2 to sham operation at each time point, and brains were fixed by intracardiac perfusion fixation with 4% neutral-buffered praraformaldehyde for brain section preparation. Immunohistochemistry (IHC), western blot and terminal uridine deoxynucleotidyl transferase dUTP nick end labeling (TUNEL) assay were performed to evaluate HIF-1α expression and apoptosis. Results. In IHC and western blot, HIF-1α levels were found to reach the peak at the 2nd week in the hippocampus, while apoptotic neurons, in TUNEL assay, were maximal at the 4th week in the hippocampus, especially in the cornu ammonis 1 (CA1) region. HIF-1α levels and apoptosis were found to fluctuate during the time course. Conclusion. This study showed that BCAO induces acute ischemic responses for about 4 weeks then chronic ischemia in the hippocampus. These in vivo data are the first to show the temporal sequence of apoptosis and HIF-1α expression.

Original languageEnglish (US)
Pages (from-to)481-485
Number of pages5
JournalJournal of Korean Neurosurgical Society
Volume50
Issue number6
DOIs
StatePublished - Dec 2011

Keywords

  • Apoptosis
  • Bilateral carotid artery occlusion
  • Hippocampus
  • Hypoxia-inducible factor 1α
  • Hypoxic ischemia

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