Animal cells and systems

The Korean Society for Integrative Biology (한국통합생물학회)
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Requirement of Protein Kinase C Pathway during progesterone-induced Oocyte Maturation in Amphibian, Rana dybowskii

  • Bandyopadhyay, Jaya (Hormone Research Center and Department of Biology, Chonnam National University) ;
  • Bandyopadhyay, Arun (Hormone Research Center and Department of Biology, Chonnam National University) ;
  • Kang, Hae-Mook (Department of Genetic Engineering, Chongju University) ;
  • Kwon, Hyuk-Bang (Hormone Research Center and Department of Biology, Chonnam National University) ;
  • Choi, Hueng-Sik (Hormone Research Center and Department of Biology, Chonnam National University)
  • Published : 1998.03.01
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Abstract

The present study investigated the involvement of the phospholipase C (PLC) and protein kinase C (PKC) signaling pathways during progesteroneinduced meiotic maturation in amphibian (Rana dybowskii) oocytes. Prosesterone-induced germinal vesicle breakdown (GVBD) of oocytes was significantly inhibited by a PKC inhibitor, staurosporine and a PLC inhibitor, U73122, in a dose-dependent manner. In contrast, U73343, an inactive analogue of U73122, was ineffective in suppressing GVBD. PKC activity in oocytes reached a maximum level at 30 min after progesterone stimulation and this elevated PKC activity was effectively suppressed by U73122 or staurosporine, suggesting that the activation of PKC enzyme is closely linked to PLC signaling during oocyte maturation. In addition, these inhib itors blocked the maturation promoting factor (MPF) activity which appeared in oocytes in response to progesterone, suggesting that PKC activation is an important signal for MPF activity. Therefore, this study demonstrates that the activation of PKC via PLC signaling is directly linked to an intracellular protein kinase cascade related to the appearance of MPF activity during meiotic maturation in amphibian (Rana dybowskii) oocytes.

Keywords

References

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