KATP channels are common mediators of ischemic and calcium preconditioning in rabbits.
Calcium preconditioning (CPC), like ischemic preconditioning (IPC), reduces myocardial infarct size in dogs and rats. ATP-sensitive potassium (KATP) channels induce cardioprotection of IPC in these animals. To determine whether KATP channels mediate both IPC and CPC, pentobarbital sodium-anesthetized rabbits received 30 min of coronary artery occlusion followed by 180 min of reperfusion. IPC was elicited by 5 min of occlusion and 10 min of reperfusion, and CPC was elicited by two cycles of 5 min of calcium infusion with an interval period of 15 min. Infarct size expressed as a percentage of the area at risk was 38 +/- 3% (mean +/- SE) in controls. IPC, CPC, and pretreatment with a KATP channel opener, cromakalim, all reduced infarct size to 13 +/- 2, 17 +/- 2, and 12 +/- 3%, respectively (P < 0.01 vs. controls). Glibenclamide, a KATP channel blocker administered 45 min (but not 20 min) before sustained ischemia, attenuated the effects of IPC and CPC (31 +/- 4 and 41 +/- 6%, respectively). Thus KATP channel activation appears to contribute to these two types of cardioprotection in rabbits.
Kouchi
I
I
Department of Cardiovascular Medicine, Kyoto University Graduate School of Medicine, Japan.
Murakami
T
T
Nawada
R
R
Akao
M
M
Sasayama
S
S
D000255:Adenosine Triphosphate / Q000494:pharmacology*; D000818:Animals; D002118:Calcium / Q000378:metabolism*; D002121:Calcium Channel Blockers / Q000494:pharmacology; D002125:Calcium Gluconate / Q000494:pharmacology; D005260:Female; D006439:Hemodynamics / Q000187:drug effects / Q000502:physiology; D019157:Ischemic Preconditioning, Myocardial / Q000379:methods*; D009203:Myocardial Infarction / Q000473:pathology; D015221:Potassium Channels / Q000187:drug effects* / Q000502:physiology*; D011817:Rabbits; D014700:Verapamil / Q000494:pharmacology
D002121:Calcium Channel Blockers; D015221:Potassium Channels; D000255:Adenosine Triphosphate; D014700:Verapamil; D002125:Calcium Gluconate; D002118:Calcium