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. 1978 Jan;62(1):7–17. doi: 10.1111/j.1476-5381.1978.tb07000.x

Guanethidine-induced vasodilatation in the rabbit, mediated by endogenous histamine.

J A Angus, A Bobik, P I Korner, M T Stoneham
PMCID: PMC1667788  PMID: 74267

Abstract

1 The effects of guanethidine (0.5-4 mg/kg i.v.) on arterial pressure, hindlimb blood flow and hindlimb vascular resistance (HVR) were studied in unanesthetized rabbits subjected to "total" autonomic block. 2 Evidence that this response was mediated by histamine release was that (a) 3H-labelled histamine levels in the hindlimb venous blood rose substantially after guanethidine; (b) infusion of exogenous histamine caused an inhibition of the guanethidine-induced vasodilatation; and (c) competitive antagonism of the response was obtained with the H2-antagonist burimamide. 3 There was good correlation between the [3H]-histamine ;elease and the time course of the vasodilator response. Glyceryl trinitrate infusions that lowered HVR substantially, did not cause release of histamine. 4 Reserpine, desipramine and indomethacin pretreatment did not alter the vasodilator response to guanethidine. 5 The guanethidine vasodilator response was not influenced by the H1-antagonist mepyramine or by the other H2-antagonists, metiamide or cimetidine. The vascular receptors stimulated by endogenous histamine may be distinctive from those stimulated by exogenous histamine, or the action of guanethidine may involve greater production of histamine at an intracellular site that is more readily reached by burimamide than by the other H2-antagonists.

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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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