The Tohoku Journal of Experimental Medicine
Online ISSN : 1349-3329
Print ISSN : 0040-8727
ISSN-L : 0040-8727
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Enhancement of Vasoconstrictor Responses to 5-HT but no to Methoxamine by Cooling in Isolated Dog Lingual and Mesenteric Arteries
Miyoko Tsukada, Shigetoshi Chiba
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Keywords: cannula insertion method, canine lingual artery, mesenteric artery, cooling, 5-HT
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2000 Volume 191 Issue 3 Pages 139-144

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Abstract

The effect of temperature on submaximal vasoconstrictions to an intraluminal injection of serotonin (5-HT) and methoxamine was investigated in isolated and perfused canine lingual and mesenteric arteries, using the cannula insertion method. In both arteries cooling (from 37°C to 27°C) caused a remarkable enhancement of vasoconstriction to 5-HT, but did not to methoxamine. In lingual arteries, methoxamine-induced constrictions were strongly depressed, although those were slightly depressed in mesenteric arteries. It is assumed that 5-HT produces an important role to modulate vascular tonicity in low temperature conditions.

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© 2000 Tohoku University Medical Press
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