title: Bidirectional communication between oocytes and ovarian follicular somatic cells is required for meiotic arrest of mammalian oocytes.
abstract: Coordinated regulation of oocyte and ovarian follicular development is essential for fertility. In particular, the progression of meiosis, a germ cell-specific cell division that reduces the number of chromosomes from diploid to haploid, must be arrested until just before ovulation. Follicular somatic cells are well-known to impose this arrest, which is essential for oocyte-follicle developmental synchrony. Follicular somatic cells sustain meiotic arrest via the natriuretic peptide C/natriuretic peptide receptor 2 (NPPC/NPR2) system, and possibly also via high levels of the purine hypoxanthine in the follicular fluid. Upon activation by the ligand NPPC, NPR2, the predominant guanylyl cyclase in follicular somatic cells, produces cyclic guanosine monophosphate (cGMP), which maintains meiotic arrest after transfer to the oocyte via gap junctions. Here we report that both the NPPC/NPR2 system and hypoxanthine require the activity of inosine monophosphate dehydrogenase (IMPDH), the rate-limiting enzyme required for the production of guanylyl metabolites and cGMP. Furthermore, oocyte-derived paracrine factors, particularly the growth differentiation factor 9-bone morphogenetic protein 15 heterodimer, promote expression of Impdh and Npr2 and elevate cGMP levels in cumulus cells. Thus, although the somatic compartment of ovarian follicles plays an essential role in the maintenance of oocyte meiotic arrest, as has been known for many years, this function of the somatic cells is surprisingly regulated by signals from the oocyte itself.
authors: The Jackson Laboratory, Bar Harbor, ME 04609.
authors: Karen
authors: K
authors: Wigglesworth
authors: Kyung-Bon
authors: KB
authors: Lee
authors: Marilyn J
authors: MJ
authors: O'Brien
authors: Jia
authors: J
authors: Peng
authors: Martin M
authors: MM
authors: Matzuk
authors: John J
authors: JJ
authors: Eppig
mesh_terms: D000818:Animals; D002450:Cell Communication / Q000235:genetics; D054885:Cumulus Cells / Q000166:cytology / Q000378:metabolism; D006152:Cyclic GMP / Q000096:biosynthesis; D005260:Female; D015971:Gene Expression Regulation, Enzymologic; D019271:Hypoxanthine / Q000378:metabolism; D007168:IMP Dehydrogenase / Q000235:genetics / Q000378:metabolism; D008322:Mammals / Q000378:metabolism*; D008540:Meiosis / Q000235:genetics; D008954:Models, Biological; D009865:Oocytes / Q000166:cytology* / Q000201:enzymology; D006080:Ovarian Follicle / Q000166:cytology*; D019899:Paracrine Communication; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D017461:Receptors, Atrial Natriuretic Factor / Q000378:metabolism; D015398:Signal Transduction / Q000235:genetics
chemical_list: D012333:RNA, Messenger; D019271:Hypoxanthine; D007168:IMP Dehydrogenase; D017461:Receptors, Atrial Natriuretic Factor; D006152:Cyclic GMP
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