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Synthesis and possible function of 11-ketotestosterone during oogenesis in eel (Anguilla spp.) |
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| Authors: | M Matsubara PM Lokman A Senaha Y Kazeto S Ijiri A Kambegawa T Hirai G Young T Todo S Adachi K Yamauchi |
| Institution: | 1. Div. Marine Biosci., Grad. School Fisheries Sci., Hokkaido Univ., Hakodate, Japan 2. Dept. Marine Science, Univ. of Otago, Dunedin, New Zealand 3. Kambegawa labo, Komae, Tokyo, Japan 4. Dept. Biosci. / Biotech. Res. Center, Teikyo Univ. of Sci. and Tech., Uenohara, Yamanashi, Japan 5. Dept. Biol. Sci. & Center Repr. Biol., Univ. of Idaho, Moscow, ID, USA |
| Abstract: | The control of 11-ketotestosterone (11-KT) biosynthesis and its physiological roles were examined in female Japanese eel (Anguilla japonica) and New Zealand longfinned eel (Anguilla dieffenbachii). 11-KT was detected in serum of female eels of both species. Among various tissues from Japanese eel, the ovary had the greatest capacity to synthesize 11-KT in vitro. In addition, the oocyte diameters of eels treated with 11-KT had increased significantly. Furthermore, these oocytes were found to have an increased number of oil droplets. These findings suggest that 11-KT in female eels may be mostly of ovarian origin and that this androgen appears to play an important role in controlling pre-vitellogenic oocyte growth. |
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