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Effects of Culture Conditions on The Expression of Cyclin B1 Protein during the First Meiotic Maturation in Bovine Immature Oocytes  

Hwang Seong-Soo (Institute of Genetic Engineering)
Yoon Jong-Taek (Department of Animal Life & Resources, Hankyong National University)
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Abstract
Cyclin B1 is known to reflect the M-phase promoting factor (MPF), a universal regulator of G2/M-phase transition, activity during the process of oocytes maturation. To investigate whether culture condition affects the maturation rate and the expression of cyclin B1 protein, bovine immature oocytes are stimulated and cultured according to the following protocols: Experiment 1: denuded oocytes (denude) only, COC only, denuded oocytes+granulosa cells (denude+GCs) and COC+GCs; Experiment 2: no-activation (control), 7% ethanol for 5 min and $10{\mu}l/ml$ ionomycin for 5 min at immediately before maturation. The maturation rates of denude and no-activation group were significantly lower in both experiments (P<0.05), respectively. Co-culture or stimulation method in bovine immature oocytes culture increases the cyclin B1 expression significantly in both experiments (P<0.05). Based on these results, culture condition affects the maturation rate and the expression of cyclin B1 protein during the first meiotic maturation in bovine immature oocytes.
Keywords
Bovine oocyte; Activation; Co-culture; First meiotic maturation; Cyclin B1 protein;
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