Related Experiment Video
Updated: Jun 21, 2026
09:48
Quantification of Neurovascular Protection Following Repetitive Hypoxic Preconditioning and Transient Middle Cerebral Artery Occlusion in Mice
Published on: May 4, 2015
Delayed hypoxic postconditioning protects against cerebral ischemia in the mouse
Claire Leconte1, Emmanuelle Tixier, Thomas Freret
1CERVOxy Hypoxia and cerebrovascular pathophysiology, UMR 6232 CI-NAPS, Université de Caen Basse-Normandie, CNRS, CEA, CYCERON, Caen, France.
Stroke
|July 25, 2009
Summary
This study reveals that delayed hypoxic postconditioning, applied days after cerebral ischemia, offers neuroprotection in mice. This effect is mediated by hypoxia-inducible factor-1alpha and its target genes, erythropoietin and adrenomedullin.
Area of Science:
- Neuroscience
- Cerebrovascular Research
- Cellular Biology
Background:
- Ischemic postconditioning, involving brief blood flow interruptions after reperfusion, is known in cardiac ischemia and stroke.
- Ischemic and hypoxic preconditioning induce brain tolerance, but hypoxic postconditioning in cerebral ischemia remained uninvestigated.
Purpose of the Study:
- To investigate the existence and efficacy of delayed hypoxic postconditioning in cerebral ischemia.
- To elucidate the molecular mechanisms underlying potential neuroprotection.
Main Methods:
- Adult mice with transient middle cerebral artery occlusion received chronic intermittent hypoxia 1 or 5 days post-ischemia.
- Brain damage was assessed via T2-weighted MRI; neuroprotection was also studied in primary neuronal cultures subjected to oxygen-glucose deprivation.
Main Results:
- Late hypoxic postconditioning (5 days post-ischemia) significantly reduced delayed thalamic atrophy in mice.
- Hypoxia 14 hours after oxygen-glucose deprivation protected primary neurons.
- Hypoxic postconditioning upregulated hypoxia-inducible factor-1alpha (HIF-1α), erythropoietin (EPO), and adrenomedullin (ADM).
Conclusions:
- This study demonstrates, for the first time, delayed hypoxic postconditioning as a viable neuroprotective strategy in cerebral ischemia.
- Hypoxia-inducible factor-1α and its target genes, erythropoietin and adrenomedullin, are key mediators of this postconditioning effect.
