title: Protective effects of N-(2-mercaptopropionyl)-glycine against ischemia-reperfusion injury in hypertrophied hearts.
abstract: The beneficial effects of N-(2-mercaptopropionyl)-glycine (MPG) against ischemia-reperfusion injury in normotensive animals have been previously studied. Our objective was to test the action of MPG during ischemia and reperfusion in hearts from spontaneously hypertensive rats (SHR). Isolated hearts from SHR and age-matched normotensive rats Wistar Kyoto (WKY) were subjected to 50-min global ischemia (GI) and 2-hour reperfusion (R). In other hearts MPG 2mM was administered during 10 min before GI and the first 10 min of R. Infarct size (IS) was assessed by TTC staining technique and expressed as percentage of risk area. Postischemic recovery of myocardial function was assessed. Reduced glutathione (GSH), thiobarbituric acid reactive substances (TBARS) and SOD cytosolic activity - as estimators of oxidative stress and MnSOD cytosolic activity - as an index of (mPTP) opening were determined. In isolated mitochondria H(2)O(2)-induced mPTP opening was also measured. The treatment with MPG decreased infarct size, preserved GSH levels and decreased SOD and MnSOD cytosolic activities, TBARS concentration, and H(2)O(2) induced-mPTP opening in both rat strains. Our results show that in both hypertrophied and normal hearts an attenuation of mPTP opening via reduction of oxidative stress appears to be the predominant mechanism involved in the cardioprotection against reperfusion injury MPG-mediated.
authors: Established Investigator of CONICET, Centro de Investigaciones Cardiovasculares, Universidad Nacional de La Plata, La Plata, Buenos Aires, Argentina.
authors: Juliana C
authors: JC
authors: Fantinelli
authors: Luisa F
authors: LF
authors: González Arbeláez
authors: Ignacio A
authors: IA
authors: Pérez Núñez
authors: Susana M
authors: SM
authors: Mosca
mesh_terms: D000818:Animals; D001794:Blood Pressure / Q000187:drug effects; D002316:Cardiotonic Agents / Q000494:pharmacology*; D005978:Glutathione / Q000032:analysis; D005998:Glycine / Q000031:analogs & derivatives* / Q000494:pharmacology; D006973:Hypertension / Q000150:complications; D017379:Hypertrophy, Left Ventricular / Q000150:complications*; D008297:Male; D033681:Mitochondrial Membrane Transport Proteins / Q000378:metabolism; D000083162:Mitochondrial Permeability Transition Pore; D015428:Myocardial Reperfusion Injury / Q000150:complications / Q000378:metabolism / Q000517:prevention & control*; D009206:Myocardium / Q000473:pathology; D018384:Oxidative Stress; D051381:Rats; D011918:Rats, Inbred SHR; D011921:Rats, Inbred WKY; D017382:Reactive Oxygen Species / Q000378:metabolism; D013438:Sulfhydryl Compounds / Q000494:pharmacology*; D013482:Superoxide Dismutase / Q000378:metabolism; D017392:Thiobarbituric Acid Reactive Substances / Q000032:analysis
chemical_list: D002316:Cardiotonic Agents; D033681:Mitochondrial Membrane Transport Proteins; D000083162:Mitochondrial Permeability Transition Pore; C110658:N-(2-mercaptoproprionyl)-glycine; D017382:Reactive Oxygen Species; D013438:Sulfhydryl Compounds; D017392:Thiobarbituric Acid Reactive Substances; D013482:Superoxide Dismutase; D005978:Glutathione; D005998:Glycine