Related Experiment Videos
Methionine-enkephalin-Arg-Phe immunoreactivity in heart tissue
B A Barron1, L X Oakford, J F Gaugl
1Department of Physiology, University of North Texas Health Science Center, Fort Worth 76107, USA.
Peptides
|January 1, 1995
Summary
Opioid peptides like methionine-enkephalyl-arginyl-phenylalanine (MEAP) are found in canine hearts, concentrated in ventricles and intercalated discs, suggesting roles in cardiomyocyte communication.
Area of Science:
- Cardiovascular Physiology
- Neuroendocrinology
- Molecular Cardiology
Background:
- Enkephalins are known opioid peptides found in cardiac tissue.
- Previous research prompted investigation into enkephalin distribution in animal cardiovascular models.
Purpose of the Study:
- To investigate the distribution and localization of methionine-enkephalin (ME) and methionine-enkephalyl-arginyl-phenylalanine (MEAP) in canine cardiac tissue.
- To explore the potential role of these peptides in cardiomyocyte communication and cardiac function.
Main Methods:
- Quantification of ME and MEAP concentrations in canine atria and ventricles using HPLC.
- Immunohistochemistry on canine left ventricular tissue sections to determine peptide localization.
- Comparative analysis of peptide distribution in cat and pig hearts.
Main Results:
- Canine hearts show low, evenly distributed ME but high ventricular concentration of MEAP.
- MEAP and peptide B constitute a significant portion of ventricular immunoreactivity, with localization at intercalated discs.
- Species variations in ME and MEAP distribution were observed in feline and porcine hearts.
Conclusions:
- Opioid peptides, particularly MEAP, are present in cardiomyocytes and concentrated at intercalated discs, suggesting a role in intercellular communication.
- Non-neuronal localization of these peptides is indicated by their distribution patterns.
- Observed species-specific variations in cardiac peptide distribution may correlate with functional differences.