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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/29249

Title: Conserved roles of hormones in the reproduction of the scleractinian coral Euphyllia ancora
Authors: Wen-Hung Twan;Yan-Horn Lee;Hua-Fang Wu;Wen-Shiun Yueh;Shan-Ru Jeng;Jiang-Shiou Hwang;Ching-Fong Chang
Contributors: NTOU:Institute of Marine Biology
國立臺灣海洋大學:海洋生物研究所
Keywords: Coral;Hormone;Reproduction;Sex steroids;Gonadotropin-releasing hormone
Date: 2007
Issue Date: 2011-10-21T03:05:02Z
Publisher: Journal of the Fisheries Society of Taiwan
Abstract: Abstract:In southen Taiwan, the mass spawning of scleractinians occurs in lunar mid-March. We synchronous mass spawning of scleractinian corals, using Euphyllia ancora as a model species. Testosterone (T) and estradiol (E2) in free and glucuronided forms were identified and consistently detected in coral polyps throughout the year. Peak levels of free E2 and glucuronided E2 were obtained in the coral tissue just prior to spawning. The presence of specific aromatase activity was demonstrated in coral tissue, with a significantly high aromatase activity detected during the spawning period. Higher concentrations of free E2 than glucuronided E2 were detected in the coral tissue throughout the year. In contrast, higher levels of glucuronided E2 than free E2 and glucuronided T were found in seawater during mass coral spawning. Furthermore, immunoreactivity and biological activity of immunoreactivity gonadotropin-releasing hormone (irGnRH) were detected and peal levels of irGnRH were observed in coral tissue during spawning. Coral extracts (irGnRH) and mamalian (m)GnRH agonist had a similar dose-dependent effect on luteinizing hormone(LH) release in black porgy fish pituitary cells (in vitro); while mGnRH receptor antagonist specifically blocked the stimulatory effects of coral irGnRH. In in vivo experiments,mGnRH agonist time-and dose- dependently stimulated aromatase activity as well as levels of T and E2 in free and glucuronided forms in E. ancora. In conclusion, our data suggest that irGnRH and glucuronided E2 may play important roles in the control of reproduction and mass spawning in corals.
Relation: 34(1), pp.1-9
URI: http://ntour.ntou.edu.tw/handle/987654321/29249
Appears in Collections:[海洋生物研究所] 期刊論文

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