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Vertebrate reproductive science and technology
RESEARCH ARTICLE

Dose-dependent effects of gonadotropin on oocyte developmental competence and apoptosis

Shan Liu A B C D , Huai L. Feng A D E , Dennis Marchesi A , Zi-Jiang Chen B C E and Avner Hershlag A
+ Author Affiliations
- Author Affiliations

A Center for Human Reproduction, North Shore–Long Island Jewish Health System, New York University School of Medicine, Manhasset, NY 11030, USA.

B National Research Center for Assisted Reproductive Technology and Reproductive Genetics, Shandong Province, Jinan 250021, China.

C Key Laboratory for Reproductive Endocrinology of Ministry of Education Center for Reproductive Medicine, Provincial Hospital Affiliated to Shandong University, Shandong Province, Jinan 250021, China.

D These authors contributed equally to this paper.

E Corresponding authors. Emails: HFeng@NSHS.edu; chenzijiang@hotmail.com

Reproduction, Fertility and Development 23(8) 990-996 https://doi.org/10.1071/RD11079
Submitted: 23 April 210  Accepted: 3 May 2011   Published: 22 September 2011

Abstract

The aim of the present study was to evaluate the effect of gonadotropins (Gn) on oocyte maturation, developmental competence and apoptosis in an animal model. Bovine cumulus–oocyte complexes (COCs) were matured for 24 h in media supplemented with varying concentrations of Bravelle (B), B + Menopur (B + M) or B + Repronex (B + R) (Ferring Pharmaceuticals, Parsiappany, NJ, USA). Then, nuclear maturation, embryo development, and apoptosis in cumulus cells and oocytes were evaluated. Low to moderate Gn concentrations (75–7500 mIU mL–1) effectively improved nuclear maturation and in vitro development. Higher concentrations of Gn (75 000 mIU mL–1) did not have any added beneficial effects and nuclear maturation and blastocyst rates in the presence of these concentrations were comparable to control (P > 0.05). Most COCs showed slight apoptosis when exposed to 75, 750 and 7500 mIU mL–1 Gn; however, when the concentration was increased to 75 000 mIU mL–1, the proportion of moderately apoptotic COCs increased. In conclusion, extremely high concentrations of Gn have detrimental effects on oocyte nuclear maturation and embryo development and increase apoptosis in cumulus cells, suggesting the importance of judicious use of Gn in assisted reproductive technologies (ART).

Additional keywords: ART, in vitro maturation, TUNEL.


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