Stimulatory effects of methyltestosterone on pituitary gonadotropic cells and testes leydig cells of the three-spined stickleback, Gasterosteus aculeatus L., in winter |
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| Authors: | B Borg G Paulson J Peute |
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| Affiliation: | 1. School of Public Health, Guangdong Medical College, Dongguan 523808, China;2. Internal Medicine of Tongji Hospital, Huazhong University of Science and Technology, Wuhan 430030, China;3. Department of Neurology, Wuhan No.1 Hospital, 215 Zhongshan Rd. Wuhan 430022, China;4. Department of Cardiac Surgery, School of Health Science, University of Ioannina, Greece;5. Department of Obstetrics and Gynecology of Tongji Hospital, Huazhong University of Science and Technology, Wuhan 430030, China;6. Institute of Environmental Medicine of Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China;1. Key Laboratory of Tropical and Subtropical Fishery Resources Application and Cultivation, Ministry of Agriculture and Rural Affairs, Pearl River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou 510380, China;2. College of Fisheries and Life Science, Shanghai Ocean University, Shanghai 201306, China |
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| Abstract: | Male three-spined sticklebacks were kept for a month in short photoperiod at ca. 20 degrees in winter. During this period methyltestosterone (MT), dissolved in the water (35 micrograms/liter), stimulated the appearance of breeding colors and kidney hypertrophy, characters which were both absent in the controls. MT furthermore prevented the onset of spermatogenesis. The gonadotropic cells of the MT-treated fish contained significantly more dilated endoplasmic reticulum and less granules than those of the controls. The nuclei of the testes Leydig cells were enlarged after treatment with MT. These findings suggest the existence of a positive feedback of androgen on the gonadal-pituitary axis of the male stickleback in winter. |
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