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. 1978 Feb;62(2):165–170. doi: 10.1111/j.1476-5381.1978.tb08441.x

Responses of rabbit portal vein to histamine.

D A Cook, K M Macleod
PMCID: PMC1667819  PMID: 23880

Abstract

1 Histamine produced a dose-dependent contraction of the isolated portal vein of the rabbit. This contraction was not antagonized by atropine, methysergide, indomethacin, cocaine or 6-hydroxy-dopamine, nor by pretreatment of the rabbit with reserpine. 2 The response to histamine was blocked by H1-receptor antagonists only when the blocking agent was used in very high concentrations, and was not antagonized by the H2-receptor blocking agent, metiamide, H1-receptor antagonists did not block the effects of 5-hydroxytryptamine. 3 The contractions elicited by histamine, 5-hydroxytryptamine and noradrenaline were blocked by phentolamine. 4 Desensitization to high doses of 5-hydroxytryptamine caused a concomitant depression in the response to histamine but not to noradrenaline or acetylcholine. 5 The results suggest that the contractions of rabbit portal vein elicited by histamine are not mediated by receptors of the H1- or the H2-type, but may involve an action of histamine at a receptor which is also involved in the action of 5-hydroxytryptamine.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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