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?CaMKII is differentially regulated in brain regions that exhibit differing sensitivities to ischemia and excitotoxicity.


ABSTRACT: Different brain regions exhibit differing sensitivities to ischemia/excitotoxicity. Whether these differences are due to perfusion or intrinsic factors has not been established. Herein, we found no apparent association between sensitivity to ischemia/excitotoxicity and the level of expression or basal phosphorylation of calcium/calmodulin-stimulated protein kinase II (?CaMKII) or glutamate receptors. However, we demonstrated significant differences in CaMKII-mediated responses after ischemia/excitotoxic stimulation in striatum and cortex. In vivo ischemia and in vitro excitotoxic stimulation produced more rapid phosphorylation of Thr253-?CaMKII in striatum compared with cortex, but equal rates of Thr286-?CaMKII phosphorylation. Phosphorylation by CaMKII of Ser831-GluA1 and Ser1303-GluN2B occurred more rapidly in striatum than in cortex after either stimulus. The differences between brain regions in CaMKII activation and its effects were not accounted for by differences in the expression of ?CaMKII, glutamate receptors, or density of synapses. These results implicate intrinsic tissue differences in Thr253-?CaMKII phosphorylation in the differential sensitivities of brain regions to ischemia/excitotoxicity.

SUBMITTER: Skelding KA 

PROVIDER: S-EPMC3519412 | biostudies-literature | 2012 Dec

REPOSITORIES: biostudies-literature

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αCaMKII is differentially regulated in brain regions that exhibit differing sensitivities to ischemia and excitotoxicity.

Skelding Kathryn A KA   Spratt Neil J NJ   Fluechter Lisa L   Dickson Phillip W PW   Rostas John A P JA  

Journal of cerebral blood flow and metabolism : official journal of the International Society of Cerebral Blood Flow and Metabolism 20120829 12


Different brain regions exhibit differing sensitivities to ischemia/excitotoxicity. Whether these differences are due to perfusion or intrinsic factors has not been established. Herein, we found no apparent association between sensitivity to ischemia/excitotoxicity and the level of expression or basal phosphorylation of calcium/calmodulin-stimulated protein kinase II (αCaMKII) or glutamate receptors. However, we demonstrated significant differences in CaMKII-mediated responses after ischemia/exc  ...[more]

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