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Selection of bovine oocytes by brilliant cresyl blue staining: effect on meiosis progression, organelle distribution and embryo development

Published online by Cambridge University Press:  27 July 2011

D.S. Silva ,
P. Rodriguez ,
A. Galuppo ,
N.S. Arruda  and
J.L. Rodrigues
D.S. Silva
Affiliation:
Laboratory of Embryology and Biotechnics of Reproduction, Faculty of Veterinary Medicine, UFRGS, Brasil.
P. Rodriguez
Affiliation:
Laboratory of Embryology and Biotechnics of Reproduction, Faculty of Veterinary Medicine, UFRGS, Brasil.
A. Galuppo
Affiliation:
Laboratory of Embryology and Biotechnics of Reproduction, Faculty of Veterinary Medicine, UFRGS, Brasil.
N.S. Arruda
Affiliation:
Laboratory of Embryology and Biotechnics of Reproduction, Faculty of Veterinary Medicine, UFRGS, Brasil.
J.L. Rodrigues*
Affiliation:
Laboratory of Embryology and Biotechnics of Reproduction, Faculty of Veterinary Medicine, UFRGS; Cx. Postal 15004, 91501-970 Porto Alegre, RS, Brasil.
*
All correspondence to José Luiz Rodrigues. Laboratory of Embryology and Biotechnics of Reproduction, Faculty of Veterinary Medicine, UFRGS; Cx. Postal 15004, 91501-970 Porto Alegre, RS, Brasil. Tel: +55 5133086126. E-mail: [email protected]
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Summary

The selection of competent oocytes for in vitro maturation is still a major problem during bovine in vitro embryo production. Markers for in vitro cytoplasmic maturation, based on the organization of cortical granule and mitochondria, are lacking. We examined the pre-selection of immature bovine oocytes by brilliant cresyl blue stain (BCB test) based on glucose-6-phosphate dehydrogenase (G6PDH) activity during oocyte development. Oocytes were recovered from ovarian follicles exposed to 26 μM BCB stain and classified according to the aspect of their cytoplasm: BCB+ (oocytes with blue cytoplasm) and BCB− (unstained cytoplasm) and then in vitro matured into a conventional in vitro maturation (IVM) medium and standard procedure. In Experiment 1, nuclear maturation was determined by polar body identification, while cytoplasmic maturation was based on cortical granule (CG) migration (peripheral) and mitochondria distribution (central). Evidence of polar body, cortical granule migration and of centrally located mitochondria was significantly (p < 0.05) higher in BCB+ oocytes than in BCB− (polar body present: 65% vs 20%; peripheral CG: 72% vs. 14%; and central mitochondria: 85% vs. 19%, respectively). In Experiment 2, the efficiency pre-selection of bovine oocytes by BCB on embryo development in vitro was assessed. Cleavage rates were similar (75%) among control, BCB+ and BCB− groups, while blastocyst rates on D7 were (p < 0.05) higher (35%) in BCB+ vs BCB− (10%) or control (28%). We showed that the BCB test is efficient to identify competent immature bovine oocytes to undergo synchronous nuclear and cytoplasmic in vitro maturation thus yielding higher in vitro embryo development to blastocyst stage.

Keywords

BCBCattleIVPOocytesOrganelle distribution
Type
Research Article
Information
Zygote , Volume 21 , Issue 3 , August 2013 , pp. 250 - 255
Copyright
Copyright © Cambridge University Press 2011 

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