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Kinin release from normally perfused and ischaemic isolated rat hearts: effect of strain

M Ahmad1, I J Zeitlin, J R Parratt

  • 1Department of Physiology and Pharmacology, University of Strathclyde, Glasgow, Scotland, UK.

Immunopharmacology
|June 1, 1996
PubMed

Insights

Low kinin levels in isolated rat hearts do not explain increased ECG abnormalities. This study investigated kinin release and electrocardiogram changes in WKY, SHR, and SD rat models, characterizing kinin bradykininogen (IRBK).

Area of Science:

  • Cardiovascular Physiology
  • Pharmacology
  • Biochemistry

Background:

  • Kinin release is implicated in cardiovascular regulation.
  • Electrocardiogram (ECG) abnormalities can indicate cardiac dysfunction.
  • Understanding the relationship between kinins and ECG changes is crucial for cardiovascular research.

Purpose of the Study:

  • To investigate kinin release in isolated rat hearts during coronary artery occlusion.
  • To compare kinin levels with observed ECG abnormalities across different rat strains (WKY, SHR, SD).
  • To characterize kinin bradykininogen (IRBK) in the perfusate.

Main Methods:

  • Isolated hearts from WKY, SHR, and SD rats were subjected to 30 minutes of left descending coronary artery occlusion.
  • Kinin levels in the perfusate were measured.
  • ECG abnormalities were recorded and compared with kinin levels; IRBK was characterized.

Main Results:

  • Kinin release was observed in all tested rat strains.
  • The study found no correlation between low kinin levels and increased ECG abnormalities.
  • IRBK was successfully characterized in the perfusate.

Conclusions:

  • Low kinin levels are unlikely to be the primary cause of observed ECG abnormalities in these rat models.
  • Further research is needed to elucidate the complex mechanisms underlying ECG changes in cardiovascular disease.
  • This study provides insights into kinin's role and IRBK characterization in isolated heart models.

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