title: L-type voltage-gated calcium channel attends regulation of tyrosine phosphorylation of NMDA receptor subunit 2A induced by transient brain ischemia.
abstract: To study the mechanism of the L-type voltage-gated calcium channel (L-VGCC) involved in neuronal injury induced by brain ischemia and reperfusion (I/R), transient (15 min) brain ischemia was induced by four-vessel occlusion of Sprague-Dawley (SD) rats. Tyrosine phosphorylation of NR2A and interaction of NR2A with Src and Pyk2 in hippocampus induced by brain ischemia and reperfusion (I/R) were determined by immunoprecipitation and immunoblot(ting). Tyrosine phosphorylation of NR2A in hippocampus was enhanced after I/R. Interaction of NR2A with Src and Pyk2, tyrosine phosphorylation and kinase activity of Src and Pyk2 also increased after I/R. All the increases were partly inhibited by L-VGCC antagonist nifedipine administered to rats 20 min prior to brain ischemia. The results suggested that increase of tyrosine phosphorylation of NR2A induced by I/R had a relation to activation of L-VGCC. Src and Pyk2 interacting with NR2A might also be involved in this regulation of the tyrosine phosphorylation of NR2A induced by I/R.
authors.affiliation: Research Center for Biochemistry and Molecular Biology, Xuzhou Medical College, 84 West Huai-hai Road, Jiangsu 221002, Xuzhou, China
authors.forename: Yong
authors.initials: Y
authors.lastname: Liu
authors.forename: Xiao-Yu
authors.initials: XY
authors.lastname: Hou
authors.forename: Guang-Yi
authors.initials: GY
authors.lastname: Zhang
authors.forename: Tian-Le
authors.initials: TL
authors.lastname: Xu
mesh_terms: D000818:Animals; D002545:Brain Ischemia / Q000378:metabolism*; D002121:Calcium Channel Blockers / Q000494:pharmacology; D020746:Calcium Channels, L-Type / Q000187:drug effects / Q000378:metabolism*; D004305:Dose-Response Relationship, Drug; D051418:Focal Adhesion Kinase 2; D006624:Hippocampus / Q000187:drug effects / Q000378:metabolism / Q000503:physiopathology; D015151:Immunoblotting / Q000379:methods; D008297:Male; D009543:Nifedipine / Q000494:pharmacology; D010759:Phosphorus Isotopes / Q000378:metabolism; D019000:Phosphotyrosine / Q000378:metabolism; D011233:Precipitin Tests / Q000379:methods; D011505:Protein-Tyrosine Kinases / Q000187:drug effects / Q000378:metabolism; D051381:Rats; D017207:Rats, Sprague-Dawley; D016194:Receptors, N-Methyl-D-Aspartate / Q000187:drug effects / Q000378:metabolism*; D015424:Reperfusion / Q000379:methods; D014443:Tyrosine / Q000378:metabolism*; D019061:src-Family Kinases / Q000187:drug effects / Q000378:metabolism
chemical_list: D002121:Calcium Channel Blockers; D020746:Calcium Channels, L-Type; D051418:Focal Adhesion Kinase 2; D009543:Nifedipine; D010759:Phosphorus Isotopes; D019000:Phosphotyrosine; D011505:Protein-Tyrosine Kinases; D016194:Receptors, N-Methyl-D-Aspartate; D014443:Tyrosine; D019061:src-Family Kinases; C496054:Ptk2b protein, rat