Determination of hormones inducing oocyte maturation in <Emphasis Type="Italic">Chalcalburnus tarichi</Emphasis> (Pallas, 1811) |
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| Authors: | G Ünal E Erdo?an A R O?uz B Kaptaner E Kankaya M Elp |
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| Institution: | (1) Department of Biology, Faculty of Science and Literature, Yüzüncü Yıl University, 65080 Van, Turkey;(2) Department of Histology and Embryology, Faculty of Medicine, Yüzüncü Yıl University, 65080 Van, Turkey;(3) Department of Fisheries, Faculty of Agriculture, Yüzüncü Yıl University, 65080 Van, Turkey |
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| Abstract: | Chalcalburnus tarichi is an endemic cyprinid species living in the Lake Van basin, in eastern Anatolia, Turkey. The present study was undertaken
to determine which hormones induce oocyte maturation in C. tarichi. The levels of 17α,20β,21-trihydroxyprogesterone (20β-S), progesterone (P), 17α-hydroxyprogesterone (17α-HOP), 11-deoxycortisol
(11-DOC), and 17α-hydroxy-20β-dihydroprogesterone (17,20β-P) were measured in fish caught from Lake Van and the Karasu River,
and injected with human chorionic hormone (hCG) (1,000 and 1,500 IU/kg). Oocytes of fish caught from the lake were also incubated
in vitro with different doses (50, 200, and 1,000 ng/ml) of 20β-S, 17α-HOP, 11-DOC, and 17,20β-P. 11-DOC was found to be the
most effective hormone among those measured for inducing oocyte maturation in vivo and in vitro. 17,20β-P could not be determined
in the plasma of any fish in vivo (P < 0.05). 1,000 IU/kg dose of hCG given by injection caused a statistically significant increase in all plasma hormone levels
(P < 0.05). It was found that there was a significant decrease in the P level only at 1,500 IU/kg dose of hCG injected (P < 0.05), while the level of other hormones increased at this dose (P < 0.05). It was also determined that all the hormones were effective in germinal vesicle breakdown (GVBD) in in vitro oocyte
culture (P < 0.05). However, 11-DOC was found to be the most effective hormone in GVBD at a dose of 200 ng/ml (70% GVBD). In conclusion,
11-DOC synthesized during final oocyte maturation in C. tarichi was found to be a potent inducer of GVBD, which shows that 11-DOC may be described as an oocyte maturation steroid in this
species. |
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| Keywords: | Chalcalburnus tarichi hCG MIS Oocyte maturation |
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