Androgen dependent expression of AT1 receptor and its regulation of anion secretion in rat epididymis
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摘要Our previous studies have provided solid evidence for the presence of an intrinsic angiotensin-generating system in the rat epididymis, which plays an important role in the regulation of the anion and thus fluid secretion by the epididymal epithelium. In the present study, the effect of androgen on the expression of AT(1) receptor and its subsequent regulation of anion secretion by the epididymis were investigated using Western blotting, semi-quantitative reverse transcription-polymerase chain reaction (RT-PCR) and in vitro electrophysiological approaches. Results from Western blotting analysis showed that the expression of AT(1) receptor protein was almost abolished by castration whereas its expression was completely restored to the control level when the castrated rats were hormonally replaced with testosterone. Efferent duct ligation, however, appeared not to affect the expression of AT(1) receptor protein by the epididymis. Results from RT-PCR showed that mRNA expression of AT(1) receptor was consistent with that observed in protein expression. Results from short-circuit current (I-SC) showed that castration almost abolished the angiotensin II-induced I-SC. However, efferent duct ligation did not affect the angiotensin II-induced I-SC, which was completely blocked in the presence of losartan, a specific antagonist of the AT(1) receptor. These data indicate that the expression of epididymal AT(1) receptor is predominantly influenced by testicular androgens but not by testicular factors. This androgen-dependent expression of AT(1) receptor could have a role in the control of AT(1) receptor-mediated anion secretion and thus fluid secretion by the rat epididymis. (C) 2002 Academic Press.
著者Leung PS, Wong TP, Chung YW, Chan HC
期刊名稱Cell Biology International
出版年份2002
月份1
日期1
卷號26
期次1
出版社ACADEMIC PRESS LTD ELSEVIER SCIENCE LTD
頁次117 - 122
國際標準期刊號1065-6995
電子國際標準期刊號1095-8355
語言英式英語
關鍵詞androgen; AT(1) receptor; epididymis; renin-angiotensin system
Web of Science 學科類別Cell Biology; CELL BIOLOGY

上次更新時間 2020-16-10 於 02:19