title: Suppression of Pyk2 attenuated the increased tyrosine phosphorylation of NMDA receptor subunit 2A after brain ischemia in rat hippocampus.
abstract: Effects of suppressing the protein expression of Pyk2 on increased tyrosine phosphorylation of N-methyl-D-aspartate (NMDA) receptor subunit 2A (NR2A) after brain ischemia in rat hippocampus were studied with immunoprecipitation and immunoblot. Transient (15 min) brain ischemia and reperfusion (I/R) was induced by four-vessel occlusion in Sprague-Dawley (SD) rats. I/R led to increases of tyrosine phosphorylation of NR2A and interaction of Pyk2 and Src kinase with NR2A after 6 h of reperfusion. The increases were attenuated by Pyk2 antisense oligonucleotides intracerebroventricularly infused every 24 h for 4 days before ischemia, but not missense oligonucleotides or vehicle. The antisense also inhibited the increased auto-phosphorylation of Pyk2 and Src kinase, while the protein expression of NR2A or Src kinase had no obvious change under the above conditions. The data suggested that Pyk2 may be involved in facilitating NR2A tyrosine phosphorylation by Src kinase after I/R.
authors.affiliation: Department of Neurobiology and Biophysics, School of Life Science, University of Science and Technology of China, Hefei 230027, PR China. gyzhang@xzmc.edu.cn
authors.forename: Yong
authors.initials: Y
authors.lastname: Liu
authors.forename: Guang-Yi
authors.initials: GY
authors.lastname: Zhang
authors.forename: Jing-Zhi
authors.initials: JZ
authors.lastname: Yan
authors.forename: Tian-Le
authors.initials: TL
authors.lastname: Xu
mesh_terms: D000818:Animals; D015153:Blotting, Western / Q000379:methods; D002545:Brain Ischemia / Q000378:metabolism*; D004195:Disease Models, Animal; D051418:Focal Adhesion Kinase 2; D006624:Hippocampus / Q000187:drug effects / Q000378:metabolism*; D047468:Immunoprecipitation / Q000379:methods; D008297:Male; D009433:Neural Inhibition / Q000187:drug effects / Q000502:physiology*; D020319:Oligodeoxyribonucleotides, Antisense / Q000494:pharmacology; D010766:Phosphorylation / Q000187:drug effects; D011505:Protein-Tyrosine Kinases / Q000037:antagonists & inhibitors* / Q000737:chemistry / Q000378:metabolism; D051381:Rats; D017207:Rats, Sprague-Dawley; D016194:Receptors, N-Methyl-D-Aspartate / Q000378:metabolism*; D014443:Tyrosine / Q000378:metabolism*; D019061:src-Family Kinases / Q000378:metabolism
chemical_list: D051418:Focal Adhesion Kinase 2; D020319:Oligodeoxyribonucleotides, Antisense; D011505:Protein-Tyrosine Kinases; D016194:Receptors, N-Methyl-D-Aspartate; D014443:Tyrosine; D019061:src-Family Kinases; C496054:Ptk2b protein, rat