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MAP Kinase is Activated dring the Maturation of Porcine Oocytes
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 Title & Authors
MAP Kinase is Activated dring the Maturation of Porcine Oocytes
Chung, Ki-Hwa; Kim, Chul-Wook;
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In an attempt to evaluate the function of MAP kinase in porcine oocytes and to develop a method of the assessment of its activity, myelin basic protein (MBP) was used as a substrate to detect the MAP kinase activity of porcine oocytes which had undergone maturation in vitro. The existence of MAP kinase and MAP kinase kinase (MAPKK) was verified in immature porcine germinal vesicle (GV) oocytes at 0 h culture via Western blotting. Porcine oocytes exhibited a low level of MAP kinase activity during the first 20 h of culture, which increased at 25 h, during which time a breakdown in the nuclear membrane occurred. Significantly higher increases (p<0.05) of MAP kinase activity were detected at 30 h of culture. Using the gel phosphorylation method, MBP was phosphorylated at two positions corresponding to mammalian MAP kinase-extracellular signal-regulated kinase (ERK 1) (44 kDa) and ERK 2 (42 kDa). The absolute levels of those proteins did not increase during 40 h of culture, suggesting that the detected increase in MAP kinase activity was the result of phosphorylation rather than changes in the total amount of protein. MAPKK and MAP kinase were dephosphorylated in first-stage (MI) meiotic oocytes by the addition of cycloheximide, a protein synthesis inhibitor. These results of this study indicate that the MAP kinase cascade does exists in porcine oocytes and that its activation leads to oocyte maturation.
Porcine Oocytes;Maturation;Western Blotting;MAP Kinase;Phosphorylation;
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아세아태평양축산학회지, 2008. vol.21. 7, pp.972-979 crossref(new window)
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