The role of endothelium-derived hyperpolarizing factor and cyclooxygenase pathways in the inhibitory serotonergic response to the pressor effect elicited by sympathetic stimulation in chronic sarpogrelate treated rats.

Abstract:

:We have demonstrated that the antagonism of 5-HT2 receptors produces an enhancement of serotonergic sympathoinhibitory effect by 5-HT1D and 5-HT7 activation. The aim of this work was to determine mechanisms involved in the 5-hydroxytriptaminergic inhibitory action on the pressor responses elicited by sympathostimulation in pithed rats treated with a 5-HT2 receptor blocker. The blockade of 5-HT2 receptors was induced by orally sarpogrelate treatment (30 mg/kg/day). Two weeks later, animals were anaesthetized and pithed. A bolus injection of 1H-[1,2,4]oxadiazolo[4,3-a]quinoxalin-1-one (ODQ) (10 µg/kg), a guanylyl cyclase inhibitor, or indomethacin (2mg/kg), a non-selective COX inhibitor, prior to the infusion of (2S)(+)-5-(1,3,5-trimethylpyrazol-4-yl)-2-(dimethylamino)tetralin, AS-19 (5 µg/kg/min) were not able to abolish its inhibitory action. However, i.v. administration of glibenclamide (20mg/kg), a blocker of ATP-sensitive K(+) channels, completely reversed AS-19 sympathoinhibitory action. The inhibitory effect of 2-[5-[3-(4-methylsulfonylamino)benzyl-1,2,4-oxadiazol-5-yl]-1H-indol-3-yl]ethanamine, L-694,247 (5 µg/kg/min) was abolished by indomethacin, whereas pretreatment with ODQ had no effect. Nimesulide (3mg/kg), a COX-2 inhibitor, completely reversed the inhibitory action of L-694,247, whereas 1-[[4,5-bis (4-methoxyphenyl)-2-thiazolyl]carbonyl]-4-methylpiperazine hydrochloride (FR122047) (3mg/kg), a COX-1 inhibitor, partially blocked this action. The sympathoinhibition by 5-HT (20 µg/kg/min) could not be elicited after i.v. treatment with indomethacin plus glibenclamide. In conclusion, these results suggest that in chronic sarpogrelate-treated rats, the inhibitory serotonergic effect of the pressor responses induced by electrical stimulation of the sympathetic outflow via 5-HT7 and 5-HT1D receptor activation is mediated by KATP channel-mediated smooth muscle hyperpolarization and the COX pathway, respectively.

journal_name

Eur J Pharmacol

authors

García-Pedraza JÁ,García M,Martín ML,San Román L,Morán A

doi

10.1016/j.ejphar.2014.02.043

subject

Has Abstract

pub_date

2014-05-15 00:00:00

pages

80-7

eissn

0014-2999

issn

1879-0712

pii

S0014-2999(14)00181-2

journal_volume

731

pub_type

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