Abstract：
:The opioid peptides are involved in the regulation of neuroendocrine functions in vertebrates. Nonetheless, the influence of an opioid peptide, dynorphin A (DYN), on reproduction in fish is understudied. The aim of this work was to study the influence of DYN on the pituitary-ovary axis in Oreochromis mossambicus. Daily injections (ip) of 250 μg DYN kg-1 body weight for 22 days during the ovarian cycle caused a reduction in the intensity and the per cent area of luteinizing hormone (LH) immunoreactive content in the proximal pars distalis region of the pituitary gland compared with an intense immunostaining in time-matched controls. In the ovary, DYN treatment caused a decrease in the number of stage I (previtellogenic) follicles compared with time-matched controls. No difference was observed in the number of stage IV (vitellogenic) follicles among different experimental groups, whereas the numbers of stage II and stage III follicles (previtellogenic) were higher in DYN-treated fish than in time-matched controls. Nonetheless, there was a reduction in the number of stage V (preovulatory) follicles in DYN-treated fish compared with time-matched controls. Taken together, these results indicate that DYN exerts an inhibitory effect on follicular recruitment at the late vitellogenic stage, through the suppression of LH secretion in fish.
journal_name
J Fish Bioljournal_title
Journal of fish biologyauthors
Vijayalaxmi,Ganesh CBdoi
10.1111/jfb.14269subject
Has Abstractpub_date
2020-03-01 00:00:00pages
747-754issue
3eissn
0022-1112issn
1095-8649journal_volume
96pub_type
杂志文章abstract：:The sedentary, predatory characin Hoplias malabaricus has one of the widest distributions of freshwater fishes in South America and is characterized by seven karyomorphs (A-G) that occur in sympatric and allopatric populations. Karyotypical patterns of variation in wild populations have been interpreted as evidence of...
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journal_title：Journal of fish biology
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更新日期：2012-01-01 00:00:00
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更新日期：2009-08-01 00:00:00
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更新日期：2012-03-01 00:00:00
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journal_title：Journal of fish biology
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journal_title：Journal of fish biology
pub_type： 杂志文章,评审
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更新日期：2012-07-01 00:00:00
