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Phosphorylation pattern of the p90rsk and mitogen-activated protein kinase (MAPK) molecule: comparison of in vitro and in vivo matured porcine oocytes

Published online by Cambridge University Press:  01 August 2007

C. Schuon ,
S. Ebeling  and
B. Meinecke
C. Schuon
Affiliation:
Department of Reproductive Biology, University of Veterinary Medicine Hannover, Foundation, Hannover, Germany
S. Ebeling
Affiliation:
Department of Reproductive Biology, University of Veterinary Medicine Hannover, Foundation, Hannover, Germany
B. Meinecke*
Affiliation:
Department of Reproductive Biology, University of Veterinary Medicine Hannover, Foundation, Hannover, Germany
*
All correspondence to: Burkhard Meinecke, Department of Reproductive Biology, University of Veterinary Medicine Hannover, Foundation, Buenteweg 2, D-30559 Hannover, Germany. Tel: +49 511 953 7181. Fax: + 49 511 953 7150. e-mail: [email protected]
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Summary

The overall objective was to elucidate the phosphorylation pattern and activity of the kinase p90rsk, a substrate of mitogen-activated protein kinase (MAPK), during in vitro and in vivo maturation of pig oocytes. Cumulus–oocyte complexes were collected from slaughtered pigs and matured in vitro (0, 22, 26, 30, 34, 46 h) with and without the MEK inhibitor U0126. For in vivo maturation, gilts were stimulated with equine chorionic gonadotrophin (eCG) (600–800 IU). Maturation was induced 72 h later with hCG (500 IU). Oocytes were obtained surgically (0, 22, 30 h). The samples were submitted to electrophoresis and protein blotting analysis. Enhanced chemiluminescence was used for visualization. In vitro matured oocytes were further submitted to a commercially available radioactive kinase assay to determine kinase activity. It was shown that oocytes, as well as cumulus cells, already possess a partially phosphorylated p90rsk at the time of removal from follicles, with a further phosphorylation of the molecule occurring between 22–24 h after the initiation of culture, and in vivo maturation. The phosphorylation of p90rsk coincides with the phosphorylation of MAPK and can be prevented by U0126, indicating a MAPK-dependent phosphorylation of p90rsk. Phosphorylation of the in vivo matured oocytes occurred shown as a band of less than 200 kDa. This is presumably a molecule complex, with MAPK not being a component. Therefore, the p90rsk molecule in vivo exists as a dimer. Determination of kinase activity demonstrated decreasing enzyme activities. This led to the conclusion that the assay is not specific for p90rsk, instead measuring p70S6 kinase activities.

Keywords

MAPKMaturationp90rskPhosphorylationPig oocyte
Type
Research Article
Information
Zygote , Volume 15 , Issue 3 , August 2007 , pp. 215 - 223
Copyright
Copyright © Cambridge University Press 2007

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