title: Effects of in vitro, acute and chronic treatment with fluoxetine on the sympathetic neurotransmission of rat vas deferens.
abstract: It is described that fluoxetine treatment is able to induce ejaculatory disorders. However, the exact mechanism is still not fully understood. Therefore, this study was carried out to further evaluate the anti-ejaculatory effects of fluoxetine, using different approaches (in vitro or in vivo treatments), on the sympathetic neurotransmission of the rat vas deferens. Vas deferens from male Wistar rats were used to check the in vitro effects of fluoxetine 10-6M, 3.10-6M or 10-5M. Animals were also acutely (20mg/kg, i.p. 4h or 24h) or chronically (10mg/kg, i.p., 30days) treated with fluoxetine or drug-free vehicle. The vas deferens from non-treated and treated animals were isolated and mounted in an isolated organ bath for the study of the contractions induced by adrenergic agonists, tyramine, 5-HT, Ca2+or electrical field stimulation. In vitro or acute treatment with fluoxetine decreased the contraction induced by agonists, Ca2+or electrical field stimulation. The chronic treatment with fluoxetine decreased the contractions induced agonists, tyramine or Ca2+, but did not modify the contractions induced by electrical field stimulation. We have shown that in vitro or in vivo fluoxetine treatment is able to alter the sympathetic neurotransmission of the rat vas deferens which could be related to alterations in the calcium signalling.
authors.affiliation: Department of Pharmacology, Federal University of Sao Paulo, Sao Paulo, Brazil.
authors.forename: Shaista Poppe
authors.initials: SP
authors.lastname: Pedroso
authors.affiliation: Department of Pharmacology, Federal University of Sao Paulo, Sao Paulo, Brazil.
authors.forename: Bruno Palmieri
authors.initials: BP
authors.lastname: de Souza
authors.affiliation: Department of Pharmacology, Federal University of Sao Paulo, Sao Paulo, Brazil.
authors.forename: Aron
authors.initials: A
authors.lastname: Jurkiewicz
authors.affiliation: Department of Pharmacology, Federal University of Sao Paulo, Sao Paulo, Brazil.
authors.forename: Neide H
authors.initials: NH
authors.lastname: Juriewicz
authors.affiliation: Department of Pharmacology, Federal University of Sao Paulo, Sao Paulo, Brazil. Electronic address: edsjunior9@gmail.com.
authors.forename: Edilson Dantas
authors.initials: ED
authors.lastname: da Silva Junior
mesh_terms: D000818:Animals; D002118:Calcium / Q000378:metabolism; D004353:Drug Evaluation, Preclinical; D004542:Ejaculation / Q000187:drug effects / Q000502:physiology; D005473:Fluoxetine / Q000008:administration & dosage*; D008297:Male; D017208:Rats, Wistar; D013565:Sympatholytics / Q000008:administration & dosage*; D013566:Sympathomimetics / Q000494:pharmacology; D009435:Synaptic Transmission / Q000187:drug effects* / Q000502:physiology; D013997:Time Factors; D046509:Tissue Culture Techniques; D014649:Vas Deferens / Q000187:drug effects* / Q000502:physiology
chemical_list: D013565:Sympatholytics; D013566:Sympathomimetics; D005473:Fluoxetine; D002118:Calcium
keywords: Fluoxetine; In vitro or in vivo treatments; Sympathetic neurotransmission; Vas deferens