Protective effects of an adenosine deaminase inhibitor on ischemia-reperfusion injury in isolated perfused rat heart.
We tested the effect of the adenosine deaminase inhibitor erythro-9-(2-hydroxy-3-nonyl)adenosine (EHNA) on ischemia-reperfusion injury in isolated perfused rat heart. In the ischemia-reperfusion group (n = 10), ventricular fibrillation occurred within 3 min of reperfusion after the 40-min ischemic period. The incidence of ventricular fibrillation was 90% with a mean duration of 3.15 +/- 0.97 (SE) min. Resting tension increased significantly. By contrast, the incidence of ventricular fibrillation after reperfusion in the EHNA-treated (5 microM) group (n = 10) was 20% (P less than 0.01), and the duration was 0.30 +/- 0.21 min (P less than 0.01). Resting tension was significantly lower and around the normal level in the EHNA-treated group (P less than 0.01). Contraction amplitude and heart rate recovered to nearly normal compared with the ischemia-reperfusion group (P less than 0.01). Coronary flow was greater in the EHNA-treated group (P less than 0.01). It is concluded that EHNA protects the heart, possibly by accumulation of adenosine that benefits the hearts and by blocking the xanthine oxidase pathway for free radical generation.
Division of Physiology, Chinese Academy of Medical Sciences, Beijing.
Q Y
QY
Zhu
S G
SG
Chen
C M
CM
Zou
D000225:Adenine / Q000031:analogs & derivatives* / Q000494:pharmacology; D058892:Adenosine Deaminase Inhibitors; D000818:Animals; D003326:Coronary Circulation / Q000187:drug effects; D006321:Heart / Q000187:drug effects / Q000503:physiopathology*; D066298:In Vitro Techniques; D008297:Male; D009200:Myocardial Contraction / Q000187:drug effects; D015428:Myocardial Reperfusion Injury / Q000150:complications / Q000503:physiopathology*; D009700:Nucleoside Deaminases / Q000037:antagonists & inhibitors*; D010477:Perfusion; D051381:Rats; D011919:Rats, Inbred Strains; D012146:Rest; D014693:Ventricular Fibrillation / Q000517:prevention & control
D058892:Adenosine Deaminase Inhibitors; C010192:9-(2-hydroxy-3-nonyl)adenine; D009700:Nucleoside Deaminases; D000225:Adenine