Change in opioid peptide level in the heart and blood plasma during acute myocardial ischaemia complicated by ventricular fibrillation

L. N. Maslov, Y. B. Lishmanov

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Abstract

1. The influence of acute myocardial ischaemia (AMI) complicated by ventricular fibrillation (VF) on opioid peptide level in myocardium and blood plasma of rats has been studied. 2. Leu-enkephalin level in myocardium of rats with AMI and VF has been found to be significantly lower than in animals with AMI but without VF. 3. Met-enkephalin level has been found to be significantly increased in both animals with VF and without it. We have not found a significant difference in met-enkephalin level in myocardium of animals with VF and without it. 4. AMI was induced to increase the enkephalin and β-endorphin level in blood plasma of all the animals, whether VF had occurred or not. 5. Preliminary administration of D-Ala2,Leu5,Arg6-enkephalin, a synthetic analogue of leu-enkephalin, has prevented a decrease of ventricular fibrillation threshold in experimental coronary occlusion. 6. The obtained results allow us to conclude that enkephalins of myocardium but not opioid peptides of blood plasma play an important role in VF occurrence.

Original languageEnglish
Pages (from-to)812-816
Number of pages5
JournalClinical and Experimental Pharmacology and Physiology
Volume22
Issue number11
Publication statusPublished - 1995

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Keywords

  • Myocardial ischaemia
  • Opioid peptides
  • Ventricular fibrillation

ASJC Scopus subject areas

  • Physiology
  • Pharmacology (medical)
  • Pharmacology, Toxicology and Pharmaceutics(all)

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