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. 1995 Jul;115(5):835–839. doi: 10.1111/j.1476-5381.1995.tb15008.x

Hypotensive effect of 13-hydroxylinoleic acid in the rat: mediation via the release of a CGRP-like mediator from capsaicin-sensitive nerves.

D van Heuven-Nolsen 1, T Muis 1, F Engels 1, P A Henricks 1, T L Buckley 1, F P Nijkamp 1
PMCID: PMC1908506  PMID: 8548184

Abstract

1. The effect of 13-hydroxylinoleic acid (13-HODE) on changes in blood pressure in the rat was measured. 2. 13-HODE (0.1 - 100 micrograms kg-1) had no direct effect on blood pressure in the rat and had no effect on histamine (0.1 - 1000 micrograms kg-1)-induced changes in blood pressure. In contrast, it was found that 13-HODE itself induced a decrease in diastolic arterial blood pressure when it was injected intravenously after either a single dose of histamine (10, 100 or 1000 micrograms kg-1) or after a dose-response curve of histamine (0.1 - 1000 micrograms kg-1). 3. This hypotensive effect of 13-HODE was not observed after administration of the endothelium-dependent vasodilator, acetylcholine (0.1 - 10 micrograms kg-1), the endothelium-independent vasodilator, sodium nitroprusside (0.1 - 100 micrograms kg-1) or the inflammatory mediator, leukotriene B4 (0.1 - 300 micrograms kg-1). However, prior injection of bradykinin (0.1 - 100 micrograms kg-1) allowed a dose-dependent hypotensive effect of 13-HODE to be revealed. 4. The hypotensive effect of 13-HODE after histamine and bradykinin could be inhibited by neonatal capsaicin treatment of the rats (50 mg kg-1, s.c. on day 1 and 2 after birth). 5. Ruthenium red (120 micrograms kg-1 min-1), an inhibitor of excitatory effects on sensory nerves, and the CGRP antagonist, CGRP8-37 (1-3 micrograms kg-1 min-1) also inhibited the hypotensive effect of 13-HODE.(ABSTRACT TRUNCATED AT 250 WORDS)

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Selected References

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