Role of vertebrate steroids in the regulation of testicular development in the fresh water crab, Oziotelphusa senex senex
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چکیده
Background: Crustacean reproduction is under the control of various peptide and steroid hormones including vertebrate steroids. In the present study, we examined the role of vertebrate steroids, progesterone and 17βestradiol in the regulation of testicular development in the crab Oziotelphusa senex senex. Methods: The crabs were divided into eight groups, first group served as initial control and second group served as concurrent control received vehicle. Third, fourth and fifth groups were injected with progesterone and six, seven and eight groups were injected with 17β-estradiol each at the doses of 10, 10 and 10 mole/crab respectively on 1, 7 , 14 and 21 st day of the experiment. After 28 days of the experiment the crabs were sacrificed on 30 day and testis was collected and measured testicular indices and testicular follicle diameter. Results: The mean testicular indices and testicular follicle diameter were increased significantly (p<0.0001) in progesterone and 17β-estradiol injected crabs in a dose dependent manner when compared with controls. In the histological studies, the testes of controls and concurrent controls were in immature stage only. Whereas testes of vertebrate steroids injected were in mature stage. Conclusion: The results of the present study provide evidence that vertebrate steroids, progesterone and 17βestradiol are involved in the regulation of testicular development and spermatogenesis in crabs.
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تاریخ انتشار 2016