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Combination effects of epidermal growth factor and glial cell line-derived neurotrophic factor on the in vitro developmental potential of porcine oocytes

Published online by Cambridge University Press:  09 September 2015

Mehdi Vafaye Valleh*
Affiliation:
Department of Animal Science, Faculty of Agriculture, University of Zabol, P. O. Box 98615-538, Zabol, Iran.
Mikkel Aabech Rasmussen
Affiliation:
Department of Basic Animal and Veterinary Sciences, Faculty of Life Sciences, University of Copenhagen, Copenhagen, Denmark.
Poul Hyttel
Affiliation:
Department of Basic Animal and Veterinary Sciences, Faculty of Life Sciences, University of Copenhagen, Copenhagen, Denmark.
*
All correspondence to: Mehdi Vafaye Valleh. Department of Animal Science, Faculty of Agriculture, University of Zabol, P. O. Box 98615-538, Zabol, Iran. Tel: +98 9358237550. E-mail: mehdi.valleh@uoz.ac.ir, me_va84@yahoo.com

Summary

The developmental potential of in vitro matured porcine oocytes is still lower than that of oocytes matured and fertilized in vivo. Major problems that account for the lower efficiency of in vitro production include the improper nuclear and cytoplasmic maturation of oocytes. With the aim of improving this issue, the single and combined effects of epidermal growth factor (EGF) and glial cell line-derived neurotrophic factor (GDNF) on oocyte developmental competence were investigated. Porcine cumulus–oocyte cell complexes (COCs) were matured in serum-free medium supplemented with EGF (0, 10 or 50 ng/ml) and/or GDNF (0, 10 or 50 ng/ml) for 44 h, and subsequently subjected to fertilization and cultured for 7 days in vitro. The in vitro-formed blastocysts derived from selected growth factor groups (i.e. EGF = 50 ng/ml; GDNF = 50 ng/ml; EGF = 50 ng/ml + GDNF = 50 ng/ml) were also used for mRNA expression analysis, or were subjected to Hoechst staining. The results showed that the addition of EGF and/or GDNF during oocyte maturation dose dependently enhanced oocyte developmental competence. Compared with the embryos obtained from control or single growth factor-treated oocytes, treatment with the combination of EGF and GDNF was shown to significantly improve oocyte competence in terms of blastocyst formation, blastocyst cell number and blastocyst hatching rate (P < 0.05), and also simultaneously induced the expression of BCL-xL and TERT and suppressed the expression of caspase-3 in resulting blastocysts (P < 0.05). These results suggest that both GDNF and EGF may play an important role in the regulation of porcine in vitro oocyte maturation and the combination of these growth factors could promote oocyte competency and blastocyst quality.

Type
Research Article
Copyright
Copyright © Cambridge University Press 2015 

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