[The role of opiate receptors and ATP-dependent potassium channels of mitochondria in the formation of myocardial adaptive resistance to the arrhythmogenic effect of ischemia and reperfusion].
Preliminary stimulation of opiate receptors (ORs) by intravenous administration of mu agonist DALDA (0.5 mg/kg), delta 1 agonist DPDPE (0.5 mg/kg), and kappa agonist (-)-U-50.488 (1 mg/kg) increases rat myocardial resistance to arrhythmogenic effect of coronary occlusion (10 min) and reperfusion (10 min). Activation of delta 2 ORs (DSLET, 0.5 mg/kg) has no effect on the incidence rate of ischemic and reperfusion arrhythmias. Preliminary administration of glibenclamide (0.3 mg/kg), an inhibitor of KATP channels, blocks the antiarrhythmic effect of DALDA and DPDPE. Repeated short-term exposures of rats to immobilization within two weeks increases the heart tolerance to the arrhythmogenic effect of coronary occlusion and reperfusion. This effect disappears after administration of CTAP (0.5 mg/kg), a mu antagonist, or injection of 5-hydroxydecanoate (5 mg/kg), an inhibitor of mitochondrial KATP channels. The selective antagonists of delta and kappa ORs have no effect on cardiac adaptation-induced resistance to the arrhythmogenic effect of ischemia and reperfusion. We believe that stimulation of mu, delta, and kappa ORs increases myocardial tolerance to the arrhythmogenic effect of ischemia and reperfusion through activation of KATP channels. The antiarrhythmic effect of the adaptation is mediated by stimulation of mu ORs and mitochondrial KATP channels.
Institute of Cardiology, Tomsk Research Center, Siberian Division, Russian Academy of Medical Sciences, ul. Kievskaya 111a, Tomsk, 634050 Russia.
Iu B
IuB
Lishmanov
N V
NV
Naryzhnaia
A V
AV
Krylatov
L N
LN
Maslov
S A
SA
Bogomaz
D S
DS
Ugdyzhekova
G J
GJ
Gross
J B
JB
Stefano
D000222:Adaptation, Physiological / Q000187:drug effects / Q000502:physiology*; D000255:Adenosine Triphosphate / Q000378:metabolism; D000818:Animals; D000889:Anti-Arrhythmia Agents / Q000494:pharmacology; D001145:Arrhythmias, Cardiac / Q000188:drug therapy / Q000378:metabolism*; D003327:Coronary Disease; D003652:Decanoic Acids / Q000494:pharmacology; D020881:Enkephalin, D-Penicillamine (2,5)- / Q000494:pharmacology; D004743:Enkephalin, Leucine / Q000031:analogs & derivatives* / Q000494:pharmacology; D005905:Glyburide / Q000494:pharmacology; D006880:Hydroxy Acids / Q000494:pharmacology; D008297:Male; D008928:Mitochondria / Q000187:drug effects / Q000378:metabolism; D017202:Myocardial Ischemia / Q000150:complications / Q000188:drug therapy / Q000378:metabolism*; D015425:Myocardial Reperfusion / Q000009:adverse effects; D015428:Myocardial Reperfusion Injury / Q000150:complications / Q000188:drug therapy / Q000378:metabolism*; D009292:Narcotic Antagonists / Q000494:pharmacology; D009842:Oligopeptides / Q000494:pharmacology; D010446:Peptide Fragments; D010455:Peptides / Q000494:pharmacology; D015221:Potassium Channels / Q000378:metabolism*; D051381:Rats; D017208:Rats, Wistar; D011957:Receptors, Opioid / Q000187:drug effects / Q000378:metabolism*; D017465:Receptors, Opioid, delta / Q000378:metabolism; D017450:Receptors, Opioid, mu / Q000819:agonists / Q000037:antagonists & inhibitors / Q000378:metabolism; D013004:Somatostatin
D000889:Anti-Arrhythmia Agents; C529311:CTAP octapeptide; D003652:Decanoic Acids; D006880:Hydroxy Acids; D009292:Narcotic Antagonists; D009842:Oligopeptides; D010446:Peptide Fragments; D010455:Peptides; D015221:Potassium Channels; D011957:Receptors, Opioid; D017465:Receptors, Opioid, delta; D017450:Receptors, Opioid, mu; C063076:tyrosyl-arginyl-phenylalanyl-lysinamide; D013004:Somatostatin; D004743:Enkephalin, Leucine; C052853:5-hydroxydecanoic acid; C034318:enkephalin, Ser(2), Leu(5), Thr(6)-; D020881:Enkephalin, D-Penicillamine (2,5)-; D000255:Adenosine Triphosphate; D005905:Glyburide