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Oxytocin is a cardiovascular hormone
J Gutkowska1, M Jankowski, S Mukaddam-Daher
1Laboratory of Cardiovascular Biochemistry, Centre Hospitalier de l'Université de Montréal, Hôtel-Dieu, Department of Medicine, University of Montreal, Canada. jolanta.gutkowska@umontreal.ca
Summary
Oxytocin (OT) influences cardiovascular functions by stimulating the heart to release atrial natriuretic peptide (ANP). This study reveals OT
Area of Science:
- Cardiovascular Physiology
- Endocrinology
- Neuroscience
Background:
- Oxytocin (OT) is traditionally known for its roles in parturition and lactation.
- Emerging evidence suggests OT's involvement in cardiovascular regulation, cognition, and behavior.
- The mechanism behind OT-induced natriuresis and hypotension remained unclear.
Purpose of the Study:
- To investigate the role of atrial natriuretic peptide (ANP) in mediating the cardiovascular effects of oxytocin (OT).
- To explore the hypothesis that OT-induced cardio-renal effects are mediated by ANP release from the heart.
Main Methods:
- Demonstrated the presence and synthesis of OT receptors in cardiac compartments and vasculature.
- Assessed the functionality of OT receptors by measuring OT-induced ANP release from perfused heart and atrial slices.
- Investigated OT synthesis in the heart and major blood vessels (aorta, vena cava).
Main Results:
- Confirmed the presence and synthesis of OT receptors throughout the heart and vasculature.
- Oxytocin effectively stimulated the release of ANP from cardiac tissue.
- Identified the heart and large vessels as sites for OT synthesis.
Conclusions:
- The cardiovascular and renal effects of oxytocin are significantly mediated by the release of atrial natriuretic peptide from the heart.
- The heart and vasculature are key sites for both oxytocin synthesis and action, suggesting local regulatory roles.
- Locally produced oxytocin may regulate heart rate and vascular tone.