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Determination of hormones inducing oocyte maturation in Chalcalburnus tarichi Pallas 1811      
Yazarlar
Güler Ünal
Yüzüncü Yıl Üniversitesi, Türkiye
Ender Erdoğan
Selçuk Üniversitesi, Türkiye
Ahmet Regaib Oğuz
Yüzüncü Yıl Üniversitesi, Türkiye
Burak Kaptaner
Yüzüncü Yıl Üniversitesi, Türkiye
Ertuğrul Kankaya
Yüzüncü Yıl Üniversitesi, Türkiye
Prof. Dr. Mahmut ELP Prof. Dr. Mahmut ELP
Kastamonu Üniversitesi, Türkiye
Özet
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. © Springer Science+Business Media B.V. 2008.
Anahtar Kelimeler
Chalcalburnus tarichi | HCG | MIS | Oocyte maturation
Makale Türü Özgün Makale
Makale Alt Türü SSCI, AHCI, SCI, SCI-Exp dergilerinde yayımlanan tam makale
Dergi Adı FISH PHYSIOLOGY AND BIOCHEMISTRY
Dergi ISSN 0920-1742
Dergi Tarandığı Indeksler SCI-Expanded
Makale Dili İngilizce
Basım Tarihi 12-2008
Cilt No 34
Sayı 4
Sayfalar 447 / 454
Doi Numarası 10.1007/s10695-008-9203-8