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Serotonin and experimental vascular disease.

D D Heistad, D G Harrison, M L Armstrong

International Journal of Cardiology

|February 1, 1987

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Atherosclerosis potentiates serotonin-induced vasoconstriction, potentially contributing to vasospasm. Dietary treatment reversed these vascular abnormalities, suggesting reversibility of atherosclerosis-related hyperresponsiveness to serotonin.

Area of Science:

Cardiovascular Science
Vascular Biology
Pharmacology

Background:

Atherosclerosis is a chronic inflammatory disease characterized by plaque buildup in arteries.
Serotonin plays a role in vascular tone and can cause vasoconstriction.
Platelet aggregation at atherosclerotic lesions releases serotonin, raising concerns about its role in vasospasm.

Purpose of the Study:

To investigate the impact of atherosclerosis on serotonin-mediated vasoconstrictor responses in different vascular beds.
To determine if dietary intervention can reverse these altered vascular responses in atherosclerotic models.

Main Methods:

Examined constrictor responses to serotonin in normal and atherosclerotic monkeys across various vascular beds (limb, cerebral, mesenteric).
Administered a low-cholesterol diet to atherosclerotic monkeys for 18 months to assess treatment effects.

Related Experiment Videos

Evaluated changes in vascular lesions and vasodilator responses post-treatment.

Main Results:

Atherosclerosis significantly potentiated vasoconstrictor responses to serotonin in limb, cerebral, and mesenteric circulation.
Dietary treatment improved vascular lesions but did not consistently improve maximal vasodilator responses.
Dietary intervention abolished serotonin-induced hyperresponsiveness in the limb vasculature.

Conclusions:

Atherosclerosis potentiates vasoconstrictor responses to serotonin, a finding relevant to vasospasm pathogenesis.
Dietary treatment of atherosclerosis can reverse these potentiated vasoconstrictor responses, indicating reversibility of vascular dysfunction.