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urotensin-i suppresses the hypothalamo-hypophyseal-ovarian axis in the Mozambique tilapia,Oreochromis mossambicus

Aquaculture and Fisheries 2024年第3期9卷 339-346页

作者： Jyoti A.Kumbar C.B.Ganesh Neuroendocrinology Research Laboratory Department of Studies in ZoologyKarnatak UniversityDharwad580003India

urotensin-i(Ui)is a peptide belonging to the corticotropin-releasing hormone family,produced in the urophysis of *** investigation was undertaken to examine the effect of Ui on the hypothalamo-hypophyseal-ovarian axis in the Mozambique tilapia,a cichlid *** the first experiment,administration of Ui(2μg/100μL saline)for 22 days caused a significant reduction in the number of follicles at stages i,ii,iii(previtellogenic),iV(vitellogenic),and V(preovulatory),concomitant with a significant increase in the percent atresia of follicles at stages ii,iii,and iV than in *** the pituitary,gonadotropin-releasing hormone(GnRH)-positive fibres were detected in the proximal pars distalis(PPD)in both controls and Ui-treated fish;however,there was a significant reduction in the intensity and percent area of GnRH-immunoreactive fibres in fish treated with Ui compared with *** serum luteinizing hormone(LH)level was significantly lower,whereas a significant rise in the serum level of cortisol was noticed in Ui-treated fish compared with *** the second experiment,treatment with a low dose of Ui(10 mM)did not affect the number of ACTH-secreting cells in vitro,but the number of these cells was significantly higher in high-dose Ui(50 mM)-treated pituitaries compared to ***,the present investigation reveals for the first time that the treatment of Ui affects the follicular development process through the downregulation of the GnRH-LH axis and activation of the pituitary-interrenal pathway in teleosts.

关键词： urotensin-i CRH family Gonadotropin-releasing hormone Luteinizing hormone Ovary Oreochromis mossambicus

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