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This study investigated the in vivo serotonergic influence, characterizing 5\u2010HT<\/jats:styled-content>receptors implicated, in sympathetic innervation of mesenteric vasculature. Wistar rats were anaesthetised and prepared for the in situ autoperfused rat mesentery, monitoring systemic blood pressure (SBP<\/jats:styled-content>), heart rate (HR<\/jats:styled-content>) and mesenteric perfusion pressure (MPP<\/jats:styled-content>). Electrical stimulation of mesenteric sympathetic nerves resulted in frequency\u2010dependent increases inMPP<\/jats:styled-content>(9\u00a0\u00b1\u00a01.6, 25.7\u00a0\u00b1\u00a03.9 and 60.2\u00a0\u00b1\u00a05\u00a0mmHg for 2, 4 and 8\u00a0Hz, respectively), without alteringSBP<\/jats:styled-content>orHR<\/jats:styled-content>. 5\u2010HT<\/jats:styled-content>(1\u201025\u00a0\u03bcg\/kg), 5\u2010carboxamidotryptamine (5\u2010HT<\/jats:styled-content>1\/7<\/jats:sub>agonist; 25\u00a0\u03bcg\/kg) or L\u2010694,247 (5\u2010HT1D<\/jats:sub>agonist; 1\u201025\u00a0\u03bcg\/kg) i.a. bolus inhibited vasopressor responses by mesenteric nerves electrical stimulation, unlike i.a. bolus of agonists 8\u2010OH<\/jats:styled-content>\u2010DPAT<\/jats:styled-content>(5\u2010HT<\/jats:styled-content>1A<\/jats:sub>), CGS\u201012066B (5\u2010HT<\/jats:styled-content>1B<\/jats:sub>), BRL 54443 (5\u2010HT<\/jats:styled-content>1e\/1F<\/jats:sub>), \u03b1\u2010methyl\u20105\u2010HT<\/jats:styled-content>(5\u2010HT<\/jats:styled-content>2<\/jats:sub>), 1\u2010PBG<\/jats:styled-content>(5\u2010HT<\/jats:styled-content>3<\/jats:sub>), cisapride (5\u2010HT<\/jats:styled-content>4<\/jats:sub>) orAS<\/jats:styled-content>\u201019 (5\u2010HT<\/jats:styled-content>7<\/jats:sub>) (25\u00a0\u03bcg\/kg each). Interestingly, i.a. L\u2010694,247 (25\u00a0\u03bcg\/kg) also reduced the exogenous norepinephrine\u2010induced vasoconstrictions. Pretreatment with selective 5\u2010HT<\/jats:styled-content>1D<\/jats:sub>receptor antagonist,LY<\/jats:styled-content>310762 (1\u00a0mg\/kg, i.v.), completely abolished L\u2010694,247\u2010 and 5\u2010HT<\/jats:styled-content>\u2010induced mesenteric sympathoinhibition. Furthermore,ELISA<\/jats:styled-content>analysis confirmed 5\u2010HT<\/jats:styled-content>1D<\/jats:sub>receptors expression in mesenteric artery. These findings suggest that serotonergic mechanisms\u2010induced sympathoinhibition of mesenteric noradrenergic outflow is mediated by pre and\/or postjunctional 5\u2010HT<\/jats:styled-content>1D<\/jats:sub>receptors.<\/jats:p>","DOI":"10.1111\/1440-1681.12841","type":"journal-article","created":{"date-parts":[[2017,8,3]],"date-time":"2017-08-03T20:28:40Z","timestamp":1501792120000},"page":"1224-1231","source":"Crossref","is-referenced-by-count":9,"title":["5\u2010HT<\/scp>modulates the rat mesenteric vasopressor outflow by 5\u2010HT1D<\/sub>sympatholytic receptors"],"prefix":"10.1111","volume":"44","author":[{"given":"Jos\u00e9\u2010\u00c1ngel","family":"Garc\u00eda\u2010Pedraza","sequence":"first","affiliation":[{"name":"Laboratory of Pharmacology, Department of Physiology and Pharmacology Faculty of Pharmacy University of Salamanca Salamanca Spain"},{"name":"Biomedical Research Institute of Salamanca (IBSAL) University Hospital of Salamanca\u2010USAL\u2010 CSIC Salamanca 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Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Alicia","family":"Rodr\u00edguez\u2010Barbero","sequence":"additional","affiliation":[{"name":"Biomedical Research Institute of Salamanca (IBSAL) University Hospital of Salamanca\u2010USAL\u2010 CSIC Salamanca Spain"},{"name":"Unit of Cardiovascular and Renal Pathophysiology, Research Institute of Nephrology \u201cReina Sof\u00eda\u201d, Department of Physiology and Pharmacology University of Salamanca Salamanca Spain"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Mar\u00eda\u2010Luisa","family":"Mart\u00edn","sequence":"additional","affiliation":[{"name":"Laboratory of Pharmacology, Department of Physiology and Pharmacology Faculty of Pharmacy University of Salamanca Salamanca Spain"},{"name":"Biomedical Research Institute of Salamanca (IBSAL) University Hospital of Salamanca\u2010USAL\u2010 CSIC Salamanca 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