期刊
JOURNAL OF CEREBRAL BLOOD FLOW AND METABOLISM
卷 33, 期 3, 页码 396-406出版社
SAGE PUBLICATIONS INC
DOI: 10.1038/jcbfm.2012.179
关键词
cerebral ischemia/reperfusion; hyperbaric oxygen preconditioning; neuroprotection; oxygen-glucose deprivation; SirT1
资金
- National Science Foundation for Distinguished Young Scholars [30725039]
- key project for the National Natural Science Foundation of China [30930091]
Our previous studies have shown that hyperbaric oxygen preconditioning (HBO-PC) induces tolerance to cerebral ischemia/reperfusion (I/R). This study aimed to investigate whether SirT1, a class III histone deacetylase, is involved in neuroprotection elicited by HBO-PC in animal and cell culture models of ischemia. Rats were subjected to middle cerebral artery occlusion for 120 minutes after HBO-PC (once a day for 5 days). Primary cultured cortical neurons were exposed to 2 hours of HBO-PC after 2 hours of oxygen-glucose deprivation (OGD). We showed that HBO-PC increased SirT1 protein and mRNA expression, promoted neurobehavioral score, reduced infarct volume, and improved morphology at 24 hours and 7 days after cerebral I/R. Neuroprotection of HBO-PC was attenuated by SirT1 inhibitor EX527 and SirT1 knockdown by short interfering RNA (siRNA), whereas it was mimicked by SirT1 activator resveratrol. Furthermore, HBO-PC enhanced SirT1 expression and cell viability and reduced lactate dehydrogenase release 24 hours after OGD/re-oxygenation. The neuroprotective effect of HBO-PC was emulated through upregulating SirT1 and, reversely, attenuated through downregulating SirT1. The modulation of SirT1 was made by adenovirus infection carrying SirT1 or SirT1 siRNA. Besides, SirT1 increased B-cell lymphoma 2 (Bcl-2) expression and decrease cleaved caspase 3. These results indicate that SirT1 mediates HBO-PC-induced tolerance to cerebral I/R through inhibition of apoptosis. Journal of Cerebral Blood Flow & Metabolism (2013) 33, 396-406; doi: 10.1038/jcbfm.2012.179; published online 9 January 2013
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