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Cardiovascular effects of serotonin
1Department of Physiology and Biophysics, Mayo Clinic, Rochester, Minnesota 55905.
Journal of Cardiovascular Pharmacology
|January 1, 1987
Summary
Serotonin influences blood vessel function, causing both constriction and dilation through various receptors. Its effects are modulated by factors like endothelium presence and conditions such as hypertension.
Area of Science:
- Cardiovascular Physiology
- Neuropharmacology
Background:
- Circulating serotonin, released from platelets, targets blood vessel walls, suggesting a role in cardiac and vascular control.
- Serotonergic neurons in cerebral vessels imply neurogenic control.
- Serotonin's dual role in vasoconstriction and vasodilation is complex and receptor-dependent.
Purpose of the Study:
- To investigate the multifaceted effects of serotonin on blood vessel function.
- To elucidate the mechanisms and receptor subtypes involved in serotonin-mediated vascular responses.
- To understand how platelet-released serotonin impacts vascular tone.
Main Methods:
- Review of existing evidence on serotonin's vascular actions.
- Analysis of receptor subtypes (5-HT2 and 5-HT1) mediating serotonin's effects.
- Consideration of factors influencing vascular responsiveness to serotonin.
Main Results:
- Serotonin primarily causes vascular smooth muscle contraction via 5-HT2 receptors in peripheral vessels.
- Vasodilation occurs via 5-HT1 receptors, involving endogenous mediators or direct smooth muscle relaxation.
- Platelet aggregation releases serotonin, potentially causing both constriction and dilation, with endothelium absence favoring contraction.
Conclusions:
- Serotonin exerts significant, complex effects on blood vessels, mediating both constriction and dilation.
- Vascular responses to serotonin are influenced by receptor subtypes, endothelium, and physiological conditions like hypoxia and hypertension.