Steroidogenic Pathway to Estradiol-17β Synthesis in the Ovarian Follicles of the Protogynous Wrasse, Pseudolabrus sieboldi(Reproductive Biology)
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概要
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The bambooleaf wrasse, Pseudolabrus sieboldi, is a diandric protogynous fish with a diurnal rhythm of ovarian development, and females spawn daily during the spawning season. This study investigated the steroidogenic pathway for estradiol-17β (E2) biosynthesis in vitellogenic ovarian follicles of the bambooleaf wrasse. We incubated follicles in vitro with radioactively labeled steroid precursors, and measured serum steroid levels using microtiter plate enzyme-linked immunosorbent assays (ELISAs). ELISAs for estrone (E1) and testosterone (T) were developed. The experiments showed that E2 was synthesized from pregnenolone via 17-hydroxypregnenolone, dehydroepiandrosterone, androstenedione, and E1. T was not produced from any radiolabeled precursors, and exogenous T was not converted to E2. During the spawning season, serum levels of E2 and E1 showed similar patterns, with a diurnal rhythm of high levels at 03 : 00 hr associated with active ovarian vitellogenic follicles. In contrast, serum T levels were constant and relatively low compared to levels of E2 and E1. These results indicate that E2 is synthesized via E1, rather than T, in the ovarian follicles, and suggest that T detected in the blood is likely derived from extra-follicular tissues.
- 社団法人日本動物学会の論文
- 2001-09-20
著者
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MATSUYAMA MICHIYA
Department of Animal and Marine Bioresources Science, Faculty of Bioresource and Bioenvironmental Sc
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MATSUYAMA MICHIYA
Laboratory of Marine Biology, Faculty of Agriculture, Kyushu University
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OHTA Kohei
Department of Animal and Marine Bioresources Science, Faculty of Bioresource and Bioenvironmental Sc
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YAMAGUCHI AKIHIKO
Department of Internal Medicine, Senboku General Hospital
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YAMAGUCHI AKIHIKO
Laboratory of Marine Biology, Faculty of Agriculture, Kyushu University
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OHTA KOHEI
Laboratory of Marine Biology, Faculty of Agriculture, Kyushu University
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Ohta Kohei
Cyber Solutions Inc.
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Ohta Kohei
Laboratory Of Marine Biology Faculty Of Bioresource And Bioenvironmental Sciences Kyushu University
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Ohta Kazuyoshi
Department Of Agricultural Chemistry
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MINE Takayuki
Department of Animal and Marine Bioresource, Faculty of Agriculture, Kyushu University
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Ohta Kohei
Department Of Animal And Marine Bioresources Science Faculty Of Bioresource And Bioenvironmental Sci
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Mine Takayuki
Department Of Animal And Marine Bioresource Faculty Of Agriculture Kyushu University
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Matsuyama M
Laboratory Of Marine Biology Faculty Of Agriculture Kyushu University
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Yamaguchi Akihiko
Laboratory Of Marine Biology Faculty Of Agriculture Kyushu University
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Yamaguchi Akihiko
Department Of Cardiovascular Respiratory And Metabolic Medicine Graduated School Of Medicine Kagoshi
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Matsuyama Michiya
Laboratory Of Marine Bioresources Department Of Animal And Marine Bioresource Science Faculty Of Agr
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Yamaguchi Akihiko
Department of Animal and Marine Bioresources Science, Faculty of Bioresource and Bioenvironmental Sciences, Kyushu University
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