title: Heterogeneity of contractile 5-HT receptors in human hand veins.
abstract: To increase our knowledge of human peripheral vasospasm we characterized the contractile 5-hydroxytryptamine (5-HT) receptors in human superficial hand vein segments in vitro. The 5-HT1 receptor agonist, sumatriptan, the 5-HT2 receptor agonist, dl-alpha-methyl-5-HT, and the 5-HT3 receptor agonist, 2-methyl-5-HT, all induced concentration-dependent contractions. The contractile response to sumatriptan was antagonized by the non-selective 5-HT receptor antagonist, methiothepin, but was unaffected by the 5-HT2 receptor antagonist, ketanserin. The contractile response to dl-alpha-methyl-5-HT was antagonized by both methiothepin and ketanserin. The contraction elicited by 2-methyl-5-HT was not affected by the 5-HT3 receptor antagonist, MDL 72222, but was antagonized by ketanserin. The results suggest that serotonergic contraction in the human superficial hand vein involves both 5-HT1 and 5-HT2 but not 5-HT3 receptors. Such receptor heterogeneity in human blood vessels should be considered when using drugs and when designing future compounds for medical use.
authors.affiliation: Department of Anaesthesiology, Lund University, Sweden.
authors.forename: M
authors.initials: M
authors.lastname: Bodelsson
authors.forename: K
authors.initials: K
authors.lastname: Törnebrandt
authors.forename: I L
authors.initials: IL
authors.lastname: Bertilsson
authors.forename: B
authors.initials: B
authors.lastname: Arneklo-Nobin
mesh_terms: D000328:Adult; D000368:Aged; D004305:Dose-Response Relationship, Drug; D005260:Female; D006225:Hand / Q000098:blood supply*; D006801:Humans; D066298:In Vitro Techniques; D008297:Male; D008875:Middle Aged; D009131:Muscle, Smooth, Vascular / Q000737:chemistry* / Q000187:drug effects; D011985:Receptors, Serotonin / Q000032:analysis*; D012702:Serotonin Antagonists / Q000494:pharmacology; D017366:Serotonin Receptor Agonists / Q000494:pharmacology; D014661:Vasoconstriction / Q000187:drug effects; D014680:Veins / Q000737:chemistry*
chemical_list: D011985:Receptors, Serotonin; D012702:Serotonin Antagonists; D017366:Serotonin Receptor Agonists