title: Prophase I arrest and progression to metaphase I in mouse oocytes: comparison of resumption of meiosis and recovery from G2-arrest in somatic cells.
abstract: Mammalian oocytes are arrested at prophase I until puberty when luteinizing hormone (LH) induces resumption of meiosis of follicle-enclosed oocytes. Resumption of meiosis is tightly coupled with regulating cyclin-dependent kinase 1 (CDK1) activity. Prophase I arrest depends on inhibitory phosphorylation of CDK1 and anaphase-promoting complex-(APC-CDH1)-mediated regulation of cyclin B levels. Prophase I arrest is maintained by endogenously produced cyclic adenosine monophosphate (cAMP), which activates protein kinase A (PKA) that in turn phosphorylates (and activates) the nuclear kinase WEE2. In addition, PKA-mediated phosphorylation of the phosphatase CDC25B results in its cytoplasmic retention. The combined effect maintains low levels of CDK1 activity that are not sufficient to initiate resumption of meiosis. LH triggers synthesis of epidermal growth factor-like factors in mural granulosa cells and leads to reduced cGMP transfer from cumulus cells to oocytes via gap junctions that couple the two cell types. cGMP inhibits oocyte phosphodiesterase 3A (PDE3A) and a decline in oocyte cGMP results in increased PDE3A activity. The ensuing decrease in oocyte cAMP triggers maturation by alleviating the aforementioned phosphorylations of WEE2 and CDC25B. As a direct consequence CDC25B translocates into the nucleus. The resulting activation of CDK1 also promotes extrusion of WEE2 from the nucleus thereby providing a positive amplification mechanism for CDK1 activation. Other kinases, e.g. protein kinase B, Aurora kinase A and polo-like kinase 1, also participate in resumption of meiosis. Mechanisms governing meiotic prophase I arrest and resumption of meiosis share common features with DNA damage-induced mitotic G2-checkpoint arrest and checkpoint recovery, respectively. These common features include CDC14B-dependent activation of APC-CDH1 in prophase I arrested oocytes or G2-arrested somatic cells, and CDC25B-dependent cell cycle resumption in both oocytes and somatic cells.
authors.affiliation: Institute of Animal Physiology and Genetics, Academy of Sciences of the Czech Republic, Rumburska 89, Libechov CZ-27721, Czech Republic. solc@iapg.cas.cz
authors.forename: Petr
authors.initials: P
authors.lastname: Solc
authors.forename: Richard M
authors.initials: RM
authors.lastname: Schultz
authors.forename: Jan
authors.initials: J
authors.lastname: Motlik
mesh_terms: D000367:Age Factors; D064173:Anaphase-Promoting Complex-Cyclosome; D000818:Animals; D064200:Cdh1 Proteins; D018797:Cell Cycle Proteins / Q000378:metabolism; D049109:Cell Proliferation; D000242:Cyclic AMP / Q000378:metabolism; D056744:Cyclin B1 / Q000378:metabolism; D050756:Cyclin-Dependent Kinase Inhibitor Proteins / Q000378:metabolism; D004815:Epidermal Growth Factor / Q000378:metabolism; D005260:Female; D016195:G2 Phase; D008540:Meiosis; D049469:Meiotic Prophase I; D008677:Metaphase; D051379:Mice; D009865:Oocytes / Q000378:metabolism*; D009866:Oogenesis; D015398:Signal Transduction; D043743:Ubiquitin-Protein Ligase Complexes / Q000378:metabolism
chemical_list: C534700:Ccnb1 protein, mouse; D064200:Cdh1 Proteins; D018797:Cell Cycle Proteins; D056744:Cyclin B1; D050756:Cyclin-Dependent Kinase Inhibitor Proteins; C577585:Fzr1 protein, mouse; D004815:Epidermal Growth Factor; D000242:Cyclic AMP; D043743:Ubiquitin-Protein Ligase Complexes; D064173:Anaphase-Promoting Complex-Cyclosome
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