Abstract
Progesterone-induced meiotic maturation of Xenopusoocytes requires the synthesis of new proteins, such as Mos and cyclin B. Synthesis of Mos is thought to be necessary and sufficient for meiotic maturation; however, it has recently been proposed that newly synthesized proteins binding to p34cdc2could be involved in a signaling pathway that triggers the activation of maturation-promoting factor. We focused our attention on cyclin B proteins because they are synthesized in response to progesterone, they bind to p34cdc2, and their microinjection into resting oocytes induces meiotic maturation. We investigated cyclin B accumulation in response to progesterone in the absence of maturation-promoting factor–induced feedback. We report here that the cdk inhibitor p21cip1, when microinjected into immatureXenopus oocytes, blocks germinal vesicle breakdown induced by progesterone, by maturation-promoting factor transfer, or by injection of okadaic acid. After microinjection of p21cip1, progesterone fails to induce the activation of MAPK or p34cdc2, and Mos does not accumulate. In contrast, the level of cyclin B1 increases normally in a manner dependent on down-regulation of cAMP-dependent protein kinase but independent of cap-ribose methylation of mRNA.
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Dates
Type | When |
---|---|
Created | 12 years, 1 month ago (July 2, 2013, 7:19 p.m.) |
Deposited | 3 years, 5 months ago (Feb. 26, 2022, 9:37 p.m.) |
Indexed | 4 days, 23 hours ago (Aug. 21, 2025, 12:34 p.m.) |
Issued | 25 years, 10 months ago (Oct. 1, 1999) |
Published | 25 years, 10 months ago (Oct. 1, 1999) |
Published Print | 25 years, 10 months ago (Oct. 1, 1999) |
@article{Frank_Vaillant_1999, title={Two Distinct Mechanisms Control the Accumulation of Cyclin B1 and Mos inXenopusOocytes in Response to Progesterone}, volume={10}, ISSN={1939-4586}, url={http://dx.doi.org/10.1091/mbc.10.10.3279}, DOI={10.1091/mbc.10.10.3279}, number={10}, journal={Molecular Biology of the Cell}, publisher={American Society for Cell Biology (ASCB)}, author={Frank-Vaillant, Marie and Jessus, Catherine and Ozon, René and Maller, James L. and Haccard, Olivier}, editor={Yanagida, Mitsuhiro}, year={1999}, month=oct, pages={3279–3288} }