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Title
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Vascular interaction between 5-hydroxytryptamine and 15-lipoxygenase metabolites of arachidonic-acid
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Author
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Abstract
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| In isolated canine saphenous veins, the contractions elicited by the 15-lipoxygenase metabolites 15-HETE and 15-HPETE were augmented by 5-hydroxytryptamine (5-HT) in a concentration-dependent way. This potentiation was not mediated by the endothelium nor was it influenced by the 5-HT2-antagonist ketanserin. Phentolamine, however, reduced both the contractions and the potentiation by 5-HT. These data provide evidence for a receptor-mediated potentiation by 5-HT which occurs independently of 5-HT2-receptors. The interaction between 5-HT or aggregating platelets and 15-HPETE was studied in isolated rabbit brachiocephalic arteries. Threshold concentrations of 5-HT and platelets markedly potentiated the contractions elicited by 15-HPETE. In brachiocephalic arteries obtained from cholesterol-fed rabbits, 15-HPETE, 5-HT and platelets caused contractions similar to those obtained in control rabbits. The potentiating effect of 5-HT and platelets on the 15-HPETE-induced contractions was also comparable to that observed in control rabbits. Moreover, no difference was found between control platelets and platelets obtained from hypercholesterolemic rabbits. Our findings demonstrate a positive interaction between 5-HT and 15-lipoxygenase metabolites of arachidonic acid in arteries and veins. This interaction persists in atherosclerotic arteries and could indicate that this mechanism is involved in the genesis of vasospasm. |
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Language
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English
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Source (journal)
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European journal of pharmacology. - Amsterdam, 1967, currens
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Publication
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Amsterdam
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North-Holland
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1993
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ISSN
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0014-2999
[print]
1879-0712
[online]
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DOI
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10.1016/0014-2999(93)90459-U
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Volume/pages
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231
:2
(1993)
, p. 267-274
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ISI
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A1993KM79400018
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Full text (Publisher's DOI)
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