title: Effects of a novel, low-molecular weight inhibitor of lipid peroxidation on ischemia-reperfusion injury in isolated rat hearts and in cultured cardiomyocytes.
abstract: We investigated the effect of H290/51, a novel, low-molecular-weight inhibitor of lipid peroxidation, on cardiac ischemia-reperfusion injury. Lactate dehydrogenase (LD) release from cultured cardiomyocytes exposed to 1 h hypoxia and 4 h reoxygenation was measured after pretreatment with different concentrations of H290/51. In another series, Langendorff-perfused rat hearts were exposed to 30 min global ischemia and 60 min reperfusion (n=minimum 10 in each group): 1. Control ischemia-reperfusion. 2. Vehicle throughout the experiment. 3. Vehicle during stabilization, and H290/51 (10(-6) mol/l) during reperfusion. 4. H290/51 throughout the experiments. During reoxygenation of isolated cardiomyocytes, H290/51 dose dependently inhibited LD release with an pIC50 value of 7.2+/-0.4 (mean+/-SEM), with 10(-6) mol/l as the lowest efficient concentration. In isolated hearts ischemia-reperfusion induced severe reperfusion arrhythmias, reduced left ventricular developed pressure (LVDP) and coronary flow (CF), and increased LV end-diastolic pressure (LVEDP). LD activity in the effluent increased. H290/51 throughout perfusion (group 4) reduced the occurrence of severe reperfusion arrhythmias (p < .0001), attenuated the decrease of LVDP (p < .008), and CF (p < .006), the increase of LVEDP (p < .008), and the release of LD (p < .002). Tissue contents of thiobarbituric acid-reactive substances did not increase during reperfusion in controls, but was reduced in group 4 (p < .004). H290/51 given only during reperfusion (group 3) tended to improve cardiac function, but significantly so only for increase of CF (p < .01). The lipid peroxidation inhibitor H290/51 attenuated cardiac injury induced by ischemia-reperfusion.
authors.affiliation: Department of Thoracic Surgery, Karolinska Hospital, Stockholm, Sweden.
authors.forename: A
authors.initials: A
authors.lastname: Nagy
authors.forename: G
authors.initials: G
authors.lastname: Valen
authors.forename: B
authors.initials: B
authors.lastname: Ek
authors.forename: P
authors.initials: P
authors.lastname: Sellei
authors.forename: P O
authors.initials: PO
authors.lastname: Sjöquist
authors.forename: J
authors.initials: J
authors.lastname: Vaage
mesh_terms: D000818:Animals; D000831:Animals, Newborn; D000975:Antioxidants / Q000494:pharmacology*; D001794:Blood Pressure / Q000187:drug effects; D002478:Cells, Cultured; D003326:Coronary Circulation / Q000187:drug effects; D066298:In Vitro Techniques; D007211:Indoles / Q000494:pharmacology*; D007770:L-Lactate Dehydrogenase / Q000378:metabolism; D015227:Lipid Peroxidation / Q000187:drug effects*; D008297:Male; D015428:Myocardial Reperfusion Injury / Q000201:enzymology / Q000378:metabolism / Q000503:physiopathology; D009206:Myocardium / Q000737:chemistry / Q000201:enzymology / Q000378:metabolism*; D051381:Rats; D017207:Rats, Sprague-Dawley; D017392:Thiobarbituric Acid Reactive Substances / Q000032:analysis; D016277:Ventricular Function, Left / Q000187:drug effects
chemical_list: D000975:Antioxidants; C088233:H290-51; D007211:Indoles; D017392:Thiobarbituric Acid Reactive Substances; D007770:L-Lactate Dehydrogenase