期刊
JOURNAL OF CEREBRAL BLOOD FLOW AND METABOLISM
卷 32, 期 4, 页码 720-730出版社
SAGE PUBLICATIONS INC
DOI: 10.1038/jcbfm.2011.176
关键词
casein kinase 2; middle cerebral artery occlusion; NADPH oxidase; NOX2; reactive oxygen species
资金
- National Institutes of Health [PO1 NS014543, RO1 NS036147, RO1 NS025372, RO1 NS038653]
- James R Doty Endowment
Activation of the NADPH oxidase subunit, NOX2, and increased oxidative stress are associated with neuronal death after cerebral ischemia and reperfusion. Inhibition of NOX2 by casein kinase 2 (CK2) leads to neuronal survival, but the mechanism is unknown. In this study, we show that in copper/zinc-superoxide dismutase transgenic (SOD1 Tg) mice, degradation of CK2 alpha and CK2 alpha' and dephosphorylation of CK2 beta against oxidative stress were markedly reduced compared with wildtype (WT) mice that underwent middle cerebral artery occlusion. Inhibition of CK2 pharmacologically or by ischemic reperfusion facilitated accumulation of poly(ADP-ribose) polymers, the translocation of apoptosis-inducing factor (AIF), and cytochrome c release from mitochondria after ischemic injury. The eventual enhancement of CK2 inhibition under ischemic injury strongly increased 8-hydroxy-2'-deoxyguanosine and phosphorylation of H2A.X. Furthermore, CK2 inhibition by tetrabromocinnamic acid (TBCA) in SOD1 Tg and gp91 knockout (KO) mice after ischemia reperfusion induced less release of AIF and cytochrome c than in TBCA-treated WT mice. Inhibition of CK2 in gp91 KO mice subjected to ischemia reperfusion did not increase brain infarction compared with TBCA-treated WT mice. These results strongly suggest that NOX2 activation releases reactive oxygen species after CK2 inhibition, triggering release of apoptogenic factors from mitochondria and inducing DNA damage after ischemic brain injury. Journal of Cerebral Blood Flow & Metabolism (2012) 32, 720-730; doi:10.1038/jcbfm.2011.176; published online 7 December 2011
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