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- W828340498 abstract "The epididymis is an organ composed by a single convoluted tubule subdivided into three distinct anatomical regions: caput, corpus and cauda epididymis. Caput and corpus epididymis have a role in sperm maturation, while cauda epididymis store and maintain the sperm in a quiescent state prior the ejaculation. The cauda epididymis has a thicker smooth muscle layer than the others regions and is under the control of the sympathetic nervous system. During the emission phase of ejaculation, noradrenaline released from sympathetic nerve varicosities induces smooth muscle contraction in the cauda epididymis and vas deferens to propel the sperm towards the prostatic urethra. Despite some studies reporting the expression and involvement of α1-adrenoceptors in the contraction of cauda epididymis, the α1adrenoceptors subtypes-mediated contraction are unknown. Thus, the present study investigated the expression of the α1-adrenoceptors subtypes in proximal and distal rat cauda epididymis using RT-qPCR, radioligand binding and functional (contraction) assays. The results indicate the expression of mRNA encoding all three α1-adrenoceptors in the rat cauda epididymis, but radioligand binding studies reveal the presence of only α1A and α1D-adrenoceptors. In addition, only the α1Aadrenoceptor subtype mediates the contractions of both regions in response to noradrenaline. The cauda epididymis may serve as good model for the pharmacological characterization of drugs acting at α1-adrenoceptors and for the study of the effects of drugs in the male reproductive system." @default.
- W828340498 created "2016-06-24" @default.
- W828340498 creator A5073973702 @default.
- W828340498 date "2012-06-12" @default.
- W828340498 modified "2023-09-24" @default.
- W828340498 title "Expressão e caracterização farmacológica dos subtipos de adrenoceptores α1 na cauda proximal e distal do epidídimo de rato" @default.
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