title: Reduction of ischemic, pharmacological and remote preconditioning effects by an antioxidant N-acetyl cysteine pretreatment in isolated rat heart.
abstract: The present study was designed to investigate the possible role of free radicals in cardioprotective effects of ischemic, pharmacological and remote preconditioning. Isolated rat heart was perfused on Langendorff apparatus with Kreb's Henseleit solution and subjected to 30 min global ischemia followed by 120 min reperfusion. To assess myocardial injury, coronary effluent was analyzed for lactate dehydrogenase and creatine kinase activity. Myocardial infarct size was estimated using triphenyl tetrazolium chloride staining. Ischemic preconditioning, pharmacological preconditioning (angiotensin II; H2O2), remote aortic preconditioning markedly attenuated I/R induced increase in lactate dehydrogenase and creatine kinase release and myocardial infarct size. Administration of N-Acetyl Cysteine (NAC), in vitro, during ischemic and pharmacological, and in vivo during remote preconditioning attenuated the cardioprotective effects of preconditioning. On the basis of these results, it may be concluded that sub threshold generation of Reactive Oxygen Species (ROS) may activate redox signaling which may be responsible for preconditioning induced cardioprotection.
authors.affiliation: Department of Pharmaceutical Sciences and Drug Research, Punjabi University, Punjab, India. gitikagitika@gmail.com
authors.forename: Gitika
authors.initials: G
authors.lastname: Khanna
authors.forename: Vishal
authors.initials: V
authors.lastname: Diwan
authors.forename: Manjeet
authors.initials: M
authors.lastname: Singh
authors.forename: Nirmal
authors.initials: N
authors.lastname: Singh
authors.forename: Amteshwar S
authors.initials: AS
authors.lastname: Jaggi
mesh_terms: D000111:Acetylcysteine / Q000494:pharmacology*; D000804:Angiotensin II; D000818:Animals; D002316:Cardiotonic Agents / Q000037:antagonists & inhibitors / Q000494:pharmacology*; D005260:Female; D016166:Free Radical Scavengers / Q000494:pharmacology*; D006861:Hydrogen Peroxide; D066298:In Vitro Techniques; D019194:Ischemic Preconditioning; D008297:Male; D009203:Myocardial Infarction / Q000517:prevention & control; D010084:Oxidation-Reduction / Q000187:drug effects; D051381:Rats; D017208:Rats, Wistar; D017382:Reactive Oxygen Species / Q000037:antagonists & inhibitors / Q000494:pharmacology*
chemical_list: D002316:Cardiotonic Agents; D016166:Free Radical Scavengers; D017382:Reactive Oxygen Species; D000804:Angiotensin II; D006861:Hydrogen Peroxide; D000111:Acetylcysteine