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Sumatriptan-induced saphenous venoconstriction in the anaesthetized dog through 5-HT1-like receptor activation.
- Source :
-
British journal of pharmacology [Br J Pharmacol] 1995 Oct; Vol. 116 (4), pp. 2207-12. - Publication Year :
- 1995
-
Abstract
- 1. The role of vasoconstrictor 5-HT1-like receptors in the control of vascular reactivity in vivo has been relatively little studied, particularly with regards to venous function. Using an anaesthetized dog model, we have investigated the haemodynamic profile of the selective 5-HT1-like agonist, sumatriptan, focussing on the reactivity of the saphenous venous bed. The key feature of our experimental model was the implantation of ultrasonic crystals on the adventitial surface of the lateral saphenous vein to provide direct and continuous measurement of drug-induced changes in vein diameter. Saphenous vein pressure was measured simultaneously via a proximal branch. 2. Sumatriptan 1-30 micrograms kg-1, i.v., produced pronounced dose-related reductions in saphenous vein diameter which reached congruent to 40% at the highest dose tested. Sumatriptan also produced modest increases in mean blood pressure, total peripheral resistance and left ventricular end diastolic pressure but had little or no effect on cardiac output, heart rate, cardiac contractility or saphenous venous pressure. Sumatriptan-induced reductions in saphenous vein diameter were strongly antagonized by the 5-HT1-receptor antagonist, methiothepin (0.3 mg kg-1, i.v.) but were unaffected by the 5-HT2 antagonist, ketanserin (0.3 mg kg-1, i.v.). 3. Hence, 5-HT1-like receptor stimulation in vivo can result in a powerful local venoconstrictor effect.
- Subjects :
- Anesthesia
Animals
Aorta, Thoracic cytology
Aorta, Thoracic drug effects
Brachial Artery cytology
Brachial Artery drug effects
Dogs
Dose-Response Relationship, Drug
Female
Hemodynamics drug effects
Male
Methiothepin pharmacology
Serotonin Antagonists pharmacology
Muscle, Smooth, Vascular drug effects
Receptors, Serotonin drug effects
Saphenous Vein drug effects
Serotonin Receptor Agonists pharmacology
Sumatriptan pharmacology
Vasoconstriction drug effects
Subjects
Details
- Language :
- English
- ISSN :
- 0007-1188
- Volume :
- 116
- Issue :
- 4
- Database :
- MEDLINE
- Journal :
- British journal of pharmacology
- Publication Type :
- Academic Journal
- Accession number :
- 8564250
- Full Text :
- https://doi.org/10.1111/j.1476-5381.1995.tb15055.x