Identification of specific nuclear protein kinase C isozymes and accelerated protein kinase C-dependent nuclear protein phosphorylation during myocardial ischemia.
Protein kinase C (PKC) has been suggested to mediate, at least in part, multiple processes in the pathophysiological sequelae of myocardial ischemia. The present study demonstrates that the epsilon, eta and iota isozymes of PKC are translocated to nuclei in response to brief intervals of global ischemia as well as reperfusion of ischemic rat myocardium. Concomitant with the translocation of PKC isozymes to nuclei during ischemia, increased PKC-mediated nuclear protein phosphorylation was observed. Taken together, the present results demonstrate that nuclear signaling mechanisms are activated during myocardial ischemia that include PKC translocation and PKC-mediated nuclear protein phosphorylation.
Albert
C J
CJ
Department of Biochemistry and Molecular Biology, St. Louis University Health Sciences Center, MO 63104, USA.
Ford
D A
DA
D000818:Animals; D015415:Biomarkers / Q000032:analysis; D015153:Blotting, Western; D002458:Cell Fractionation; D002467:Cell Nucleus / Q000201:enzymology / Q000378:metabolism*; D003600:Cytosol / Q000378:metabolism; D007211:Indoles / Q000494:pharmacology; D007527:Isoenzymes / Q000378:metabolism*; D008297:Male; D008301:Maleimides / Q000494:pharmacology; D017202:Myocardial Ischemia / Q000201:enzymology / Q000378:metabolism*; D015425:Myocardial Reperfusion; D009206:Myocardium / Q000201:enzymology / Q000378:metabolism*; D009687:Nuclear Proteins / Q000378:metabolism*; D010766:Phosphorylation; D011493:Protein Kinase C / Q000037:antagonists & inhibitors / Q000378:metabolism*; D051744:Protein Kinase C-epsilon; D051381:Rats; D017207:Rats, Sprague-Dawley; D000099293:Protein Kinase C-lambda
D015415:Biomarkers; D007211:Indoles; D007527:Isoenzymes; D008301:Maleimides; D009687:Nuclear Proteins; D011493:Protein Kinase C; D051744:Protein Kinase C-epsilon; D000099293:Protein Kinase C-lambda; C497257:Prkce protein, rat; C081975:protein kinase C eta; C088060:bisindolylmaleimide