PKCβ1 regulates meiotic cell cycle in mouse oocyte.

a member of the classical protein kinase C family, plays key roles in regulating cell cycle transition. Here, we report the expression, localization and functions of in mouse oocyte meiotic maturation. duanyu1531βI and were expressed from germinal vesicle (GV) stage to metaphase II (MII) stage. Confocal microscopy revealed that duanyu1531βI was localized in the GV and evenly distributed in the cytoplasm after GV breakdown (GVBD), and it was concentrated at the midbody at telophase in meiotic oocytes. While, p-duanyu1531βI was concentrated at the spindle poles at the metaphase stages and associated with midbody at telophase. Depletion of duanyu1531βI by specific siRNA injection resulted in defective spindles, accompanied with spindle assembly checkpoint activation, metaphase I arrest and failure of first polar body (PB1) extrusion. Live cell imaging analysis also revealed that knockdown of duanyu1531βI resulted in abnormal spindles, misaligned chromosomes, and meiotic arrest of oocytes arrest at the Pro-MI/MI stage. duanyu1531βI depletion did not affect the G2/M transition, but its overexpression delayed the G2/M transition through regulating Cyclin B1 level and Cdc2 activity. Our findings reveal that duanyu1531βI is a critical regulator of meiotic cell cycle progression in oocytes. Abbreviations: protein kinase C; COC, cumulus-oocyte complexes; GV, germinal vesicle; GVBD, germinal vesicle breakdown; Pro-MI, first pro-metaphase; MI, first metaphase; Tel I, telophase I; MII, second metaphase; PB1, first polar body; SAC, spindle assembly checkpoint.

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