Linked Life Data

12650977

Source:http://linkedlifedata.com/resource/pubmed/id/12650977

Statements in which the resource exists as a subject.
PredicateObject
rdf:type
lifeskim:mentions
pubmed:issue
1-2
pubmed:dateCreated
2003-3-24
pubmed:abstractText
It has been reported that cerebral ischemia induces Thr286 autophosphorylation and translocation of CaMKIIalpha which targets to and phosphorylates NR2B in hippocampus of rats [Neuroscience 96 (2000) 665; J. Biol. Chem. 275 (2000) 23798]. To further illustrate the mechanisms underlying these processes, we examined the effects of ketamine (a selective antagonist of NMDA receptor), KN-62 (1-[N,O-bis-(5-isoquinolinesulfonyl)-N-methyl-L-tyrosyl]-4-phenylpiperazine, a selective inhibitor of CaMKII) and reperfusion on CaMKII and NMDA receptors and the interactions between these signal proteins. Firstly, our results showed that ketamine decreased the ischemia-induced autophosphorylation, translocation and the targeting of CaMKIIalpha to NR2B and the serine-phosphorylation of NR2B. Secondly, KN-62 also inhibited the autophosphorylation of CaMKIIalpha, NR2B serine-phosphorylation and the binding of CaMKIIalpha to NR2B but had no effect on the translocation of CaMKII. These data strongly suggest that NMDA receptor channels mediated the Ca(2+)-dependent activation of CaMKII and NMDA receptors surely were the substrates on membranes of active CaMKII. Thirdly, our results indicated the concomitant phosphorylation and dephosphorylation of CaMKII and NR2B following ischemia or longer reperfusion. Moreover, the dissociation of CaMKII from NR2B had the same trend as that of the return of CaMKII to cytosol. All these data imply the close relationships between CaMKII and NR2B during ischemia and reperfusion, namely, CaMKII might act as an amplifier of detrimental cellular calcium signal regulated by NMDA receptors when becoming autophosphorylated and targeting to NR2B; conversely, autophosphorylated CaMKII could modulate NMDA receptor channel properties by phosphorylating NR2B.
pubmed:language
eng
pubmed:journal
pubmed:citationSubset
IM
pubmed:chemical
pubmed:status
MEDLINE
pubmed:month
Mar
pubmed:issn
0006-8993
pubmed:author
pubmed:issnType
Print
pubmed:day
28
pubmed:volume
967
pubmed:owner
NLM
pubmed:authorsComplete
Y
pubmed:pagination
161-9
pubmed:dateRevised
2007-11-15
pubmed:meshHeading
pubmed:year
2003
pubmed:articleTitle
Autophosphorylated calcium/calmodulin-dependent protein kinase II alpha (CaMKII alpha) reversibly targets to and phosphorylates N-methyl-D-aspartate receptor subunit 2B (NR2B) in cerebral ischemia and reperfusion in hippocampus of rats.
pubmed:affiliation
Research Center for Biochemistry and Molecular Biology, Xuzhou Medical College, 84 West Huai-hai Road, Xuzhou, Jiangsu 221002, China.
pubmed:publicationType
Journal Article, Research Support, Non-U.S. Gov't