Document Detail

Cyclic GMP from the surrounding somatic cells regulates cyclic AMP and meiosis in the mouse oocyte.
MedLine Citation:
PMID:  19429786     Owner:  NLM     Status:  MEDLINE    
Mammalian oocytes are arrested in meiotic prophase by an inhibitory signal from the surrounding somatic cells in the ovarian follicle. In response to luteinizing hormone (LH), which binds to receptors on the somatic cells, the oocyte proceeds to second metaphase, where it can be fertilized. Here we investigate how the somatic cells regulate the prophase-to-metaphase transition in the oocyte, and show that the inhibitory signal from the somatic cells is cGMP. Using FRET-based cyclic nucleotide sensors in follicle-enclosed mouse oocytes, we find that cGMP passes through gap junctions into the oocyte, where it inhibits the hydrolysis of cAMP by the phosphodiesterase PDE3A. This inhibition maintains a high concentration of cAMP and thus blocks meiotic progression. LH reverses the inhibitory signal by lowering cGMP levels in the somatic cells (from approximately 2 microM to approximately 80 nM at 1 hour after LH stimulation) and by closing gap junctions between the somatic cells. The resulting decrease in oocyte cGMP (from approximately 1 microM to approximately 40 nM) relieves the inhibition of PDE3A, increasing its activity by approximately 5-fold. This causes a decrease in oocyte cAMP (from approximately 700 nM to approximately 140 nM), leading to the resumption of meiosis.
Rachael P Norris; William J Ratzan; Marina Freudzon; Lisa M Mehlmann; Judith Krall; Matthew A Movsesian; Huanchen Wang; Hengming Ke; Viacheslav O Nikolaev; Laurinda A Jaffe
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Publication Detail:
Type:  Journal Article; Research Support, N.I.H., Extramural; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, Non-P.H.S.    
Journal Detail:
Title:  Development (Cambridge, England)     Volume:  136     ISSN:  0950-1991     ISO Abbreviation:  Development     Publication Date:  2009 Jun 
Date Detail:
Created Date:  2009-05-11     Completed Date:  2009-11-13     Revised Date:  2010-09-24    
Medline Journal Info:
Nlm Unique ID:  8701744     Medline TA:  Development     Country:  England    
Other Details:
Languages:  eng     Pagination:  1869-78     Citation Subset:  IM    
Department of Cell Biology, University of Connecticut Health Center, Farmington, CT 06032, USA.
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MeSH Terms
Cells, Cultured
Cyclic AMP / metabolism*
Cyclic GMP / physiology*
Cyclic Nucleotide Phosphodiesterases, Type 3
Gap Junctions / drug effects,  physiology
Luteinizing Hormone / pharmacology,  physiology
Meiosis / drug effects,  physiology*
Oocytes / drug effects,  physiology*
Ovarian Follicle / drug effects,  physiology
Grant Support
Reg. No./Substance:
60-92-4/Cyclic AMP; 7665-99-8/Cyclic GMP; 9002-67-9/Luteinizing Hormone; EC Nucleotide Phosphodiesterases, Type 3; EC protein, human

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