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Evaluation of different culture systems with low oxygen tension on the development, quality and oxidative stress-related genes of bovine embryos produced in vitro

Published online by Cambridge University Press:  24 March 2011

Maria Elena Arias ,
Raul Sanchez  and
Ricardo Felmer
Maria Elena Arias
Affiliation:
Laboratorio de Biotecnología Animal, Instituto de Investigaciones Agropecuarias, INIA-Carillanca, Temuco, Chile. Centro de Biotecnología de la Reproducción. Universidad de La Frontera, Temuco, Chile.
Raul Sanchez
Affiliation:
Centro de Biotecnología de la Reproducción. Universidad de La Frontera, Temuco, Chile.
Ricardo Felmer*
Affiliation:
Laboratorio de Biotecnología Animal, Instituto de Investigaciones Agropecuarias, INIA-Carillanca. Camino Cajon Vilcun s/n Km. 10. Casilla 58-D, Temuco, Chile.
*
All correspondence to: Ricardo Felmer. Laboratorio de Biotecnología Animal, Instituto de Investigaciones Agropecuarias, INIA-Carillanca. Camino Cajon Vilcun s/n Km. 10. Casilla 58-D, Temuco, Chile. Tel: +56 45 215706. Fax: +56 45 216112. e-mail: rfelmer@inia.cl
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Summary

The present study was conducted to assess the development, quality and gene expression profile of oxidative stress-related genes of bovine embryos cultured in different culture systems with low oxygen tension (5% CO2, 5% O2 and 90% N2). The systems assessed included: (1) an incubator chamber; (2) a plastic bag; and (3) a foil bag. The choice of culture system had no effect on cleavage rate at 72 h. However, significant differences (P < 0.01) were observed in the rate of blastocysts registered at day 7 (29.8, 20.2 and 12.7% for incubator chamber, plastic bag and foil bag, respectively). Total number of cells did not differ between systems, although the proportion of ICM:total cells was affected particularly in the plastic bag (19.5%), compared with the incubator chamber (31.4%). In addition, significant differences were found in the apoptotic:total cell ratio (3.3, 6.5 and 8.8% for the incubator chamber, plastic bag and foil bag, respectively), with apoptotic nuclei localised mainly in the ICM compartment of the embryo. The amount of reactive oxygen species was also different between culture systems and this effect was correlated with a higher expression of SOD2, GSS and GPX1 genes in embryos cultured in the gassed bags as compared with embryos cultured in the incubator chamber. In conclusion, these results give evidence that, under low oxygen tension, the incubator chamber is more efficient and generates higher number of, and better quality, embryos than gassed bag systems evaluated here and this effect was probably due to an increased level of reactive oxygen species in the gassed bags, which upregulates the expression of some antioxidant enzymes to compensate for hyperoxia conditions.

Keywords

Bovine embryosGassed bagsGene expressionOxygen tension
Type
Research Article
Information
Zygote , Volume 20 , Issue 3 , August 2012 , pp. 209 - 217
Copyright
Copyright © Cambridge University Press 2011

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