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Effect of different activation modes on DNA integrity of porcine M II oocytes matured in vitro

Published online by Cambridge University Press:  12 June 2009

Bozena Novotná ,
Jaroslav Petr ,
Marketa Sedmíková ,
Jana Kratochvilová  and
Frantisek Jílek
Bozena Novotná*
Affiliation:
Department of Genetic Ecotoxicology, Institute of Experimental Medicine, v.v.i, ASCR, Prague, Czech Republic.
Jaroslav Petr
Affiliation:
Reproduction Biology Laboratory, Research Institute of Animal Production, v.v.i., Prague, Czech Republic.
Marketa Sedmíková
Affiliation:
Department of Veterinary Sciences, Faculty of Agrobiology, Food and Natural Resources, University of Life Sciences in Prague, Prague 6, Czech Republic.
Jana Kratochvilová
Affiliation:
Department of Veterinary Sciences, Faculty of Agrobiology, Food and Natural Resources, University of Life Sciences in Prague, Prague 6, Czech Republic.
Frantisek Jílek
Affiliation:
Department of Veterinary Sciences, Faculty of Agrobiology, Food and Natural Resources, University of Life Sciences in Prague, Prague 6, Czech Republic.
*
All correspondence to: Bozena Novotná. Department of Genetic Ecotoxicology, Institute of Experimental Medicine, v.v.i, ASCR, Prague, Czech Republic. Tel: +420 24106 2209. Fax: +420 24106 2785. e-mail: novotna@biomed.cas.cz
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Summary

The effect of different activation protocols on DNA integrity of porcine oocytes matured in vitro was analysed using the comet assay. The oocytes from ovaries of slaughtered gilts were cultured for 48 h in modified M199 medium. They were then freed of cumulus cells and treated continuously or intermittently with a nitric oxide (NO) donor for 6 h. Standard activation with calcium ions (Ca2+) and culture without any treatment served as positive and negative controls, respectively. The activation was assessed according to the formation of pronuclei. Exposure of oocytes to Ca2+ was associated with high activation efficiency, but decreased DNA integrity. The opposite, i.e. low activation efficiency but high DNA integrity was observed after continuous exposure to NO. Intermittent action of NO increased the activation rate, while the values of DNA damage remained at low levels. Our data suggest that an increased DNA instability could be the main reason compromising the further embryonic development of oocytes activated by the standard protocol. The intermittent treatment with NO thus represents a promising step to optimization of parthenogenetic activation of pig oocytes.

Keywords

Comet assayDNA integrityNitric oxideOocyteParthenogenesisPig
Type
Research Article
Information
Zygote , Volume 18 , Issue 1 , February 2010 , pp. 81 - 87
Copyright
Copyright © Cambridge University Press 2009

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