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Cardiovascular actions of bromocriptine.
Acta Endocrinologica. Supplementum
|January 1, 1978
Summary
Bromocriptine effectively lowers blood pressure by acting on dopamine receptors. It relaxes blood vessels, reduces noradrenergic nerve activity, and decreases central sympathetic outflow.
Area of Science:
- Pharmacology
- Cardiovascular Physiology
Background:
- Bromocriptine is known to reduce blood pressure in various species.
- The precise mechanisms underlying its hypotensive effects require elucidation.
Purpose of the Study:
- To investigate the potential mechanisms of action for bromocriptine-induced hypotension.
- To determine the role of dopamine receptor stimulation in bromocriptine's cardiovascular effects.
Main Methods:
- Experiments were conducted on dogs and cats to assess bromocriptine's effects on blood pressure.
- Potential sites of action, including vascular smooth muscle, noradrenergic nerve endings, and central sympathetic activity, were examined.
Main Results:
- Bromocriptine demonstrated a blood pressure-lowering effect in experimental animals.
- Evidence suggested three primary mechanisms: vascular smooth muscle relaxation (splanchnic and renal), inhibition of noradrenergic transmitter release, and central sympathetic inhibition.
- These effects were consistently linked to dopamine receptor stimulation.
Conclusions:
- Bromocriptine exerts its hypotensive effects through multiple pathways involving dopamine receptor activation.
- The drug influences vascular tone, neurotransmitter release, and central autonomic outflow.