Related Experiment Video
Updated: Aug 7, 2026
07:56
Contractility Measurements of Human Uterine Smooth Muscle to Aid Drug Development
Published on: January 26, 2018
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.
Related Concept Videos
01:26Secondary Messengers in Hormone Action
Water-soluble hormones cannot cross the plasma membrane, so they rely on protein receptors that span the membrane to trigger intracellular signaling pathways. These pathways then activate second messengers inside the cell, including cAMP or calcium ions.
Many hormones bind to transmembrane G protein-coupled receptors that connect to regulatory G proteins. These G proteins can then activate enzymes such as adenylyl cyclase or phospholipase C. Adenylyl cyclase converts ATP to cAMP, activating...
Many hormones bind to transmembrane G protein-coupled receptors that connect to regulatory G proteins. These G proteins can then activate enzymes such as adenylyl cyclase or phospholipase C. Adenylyl cyclase converts ATP to cAMP, activating...
01:26Heart Failure Drugs: Inotropic Agents
Positive inotropic agents are commonly used as the first line of treatment for heart failure. One such agent is digoxin, derived from the genus Digitalis, which has been known for centuries but effectively utilized since 1785. However, these cardiac glycosides can have potentially toxic effects due to their mechanism of action, which involves inhibiting Na+/K+-ATPase and increasing contractility. Digoxin is absorbed orally and distributed in various tissues, including the CNS. It has a long...
01:17Hormonal Regulation of Blood Pressure
Endocrinal or hormonal intervention in the cardiovascular system is predominantly exerted by the catecholamines - epinephrine and norepinephrine, as well as a slew of hormones that interact with renal function to modulate blood volume.
Epinephrine and Norepinephrine
The adrenal medulla releases epinephrine and norepinephrine, catecholamines that enhance and extend the sympathetic or "fight or flight" physiological response. These hormones escalate heart rate and the force of contraction while...
Epinephrine and Norepinephrine
The adrenal medulla releases epinephrine and norepinephrine, catecholamines that enhance and extend the sympathetic or "fight or flight" physiological response. These hormones escalate heart rate and the force of contraction while...
01:31Neurotransmitters
Neurotransmitters are essential chemical messengers within the nervous system, facilitating the communication between neurons. These chemical messengers, varying in function and effect, are critical for sustaining various aspects of neurological health and emotional well-being.
01:27Major Hormones and Their Functions
Hormones, the biochemical messengers produced by endocrine glands, are pivotal in regulating bodily functions and maintaining homeostasis. Each hormone's balance is crucial; imbalances can lead to significant physiological disruptions. Major hormones include oxytocin, cortisol, epinephrine, estrogen, testosterone, thyroxine, growth hormone, insulin, and glucagon.
Oxytocin, produced in the hypothalamus and released by the pituitary gland, plays a role in social bonding, childbirth, and lactation.
Oxytocin, produced in the hypothalamus and released by the pituitary gland, plays a role in social bonding, childbirth, and lactation.
01:27Regulation of the Cardiovascular System
The regulation of the cardiovascular system allows the body to adapt to various demands and maintain homeostasis.
The regulation of the cardiovascular system involves the autonomic nervous system (ANS), baroreceptors, and chemoreceptors, ensuring that heart rate and blood pressure are appropriately modulated in response to varying physiological demands.
The ANS comprises two main divisions: the sympathetic and parasympathetic nervous systems. The sympathetic nervous system enhances...
The regulation of the cardiovascular system involves the autonomic nervous system (ANS), baroreceptors, and chemoreceptors, ensuring that heart rate and blood pressure are appropriately modulated in response to varying physiological demands.
The ANS comprises two main divisions: the sympathetic and parasympathetic nervous systems. The sympathetic nervous system enhances...