Abstract
A surge of luteinizing hormone (LH) from the pituitary gland triggers ovulation, oocyte maturation, and luteinization for successful reproduction in mammals. Because the signaling molecules RAS and ERK1/2 (extracellular signal-regulated kinases 1 and 2) are activated by an LH surge in granulosa cells of preovulatory follicles, we disrupted Erk1/2 in mouse granulosa cells and provide in vivo evidence that these kinases are necessary for LH-induced oocyte resumption of meiosis, ovulation, and luteinization. In addition, biochemical analyses and selected disruption of the Cebpb gene in granulosa cells demonstrate that C/EBPbeta (CCAAT/Enhancer-binding protein-beta) is a critical downstream mediator of ERK1/2 activation. Thus, ERK1/2 and C/EBPbeta constitute an in vivo LH-regulated signaling pathway that controls ovulation- and luteinization-related events.
MeSH Terms
Animals
CCAAT-Enhancer-Binding Protein-beta/genetics,metabolism
Enzyme Activation
Female
Fertility
Gene Expression Profiling
Granulosa Cells/enzymology,metabolism
Luteinizing Hormone/metabolism
MAP Kinase Signaling System
Meiosis
Mice
Mice, Inbred C57BL
Mice, Transgenic
Mitogen-Activated Protein Kinase 1/metabolism
Mitogen-Activated Protein Kinase 3/metabolism
Oocytes/physiology
Ovarian Follicle/physiology
Ovulation
Phosphorylation
Chemicals
CCAAT-Enhancer-Binding Protein-beta
Luteinizing Hormone
Mitogen-Activated Protein Kinase 1
Mitogen-Activated Protein Kinase 3
Authors & Affiliations
7 authors, click to expand affiliations / ORCID
Fan Heng-Yu
Department of Molecular and Cellular Biology, Baylor College of Medicine, 1 Baylor Plaza, Houston, TX 77030, USA.
Liu Zhilin
Shimada Masayuki
Sterneck Esta
Johnson Peter F
Hedrick Stephen M
Richards Joanne S
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