Unknown

Dataset Information

0

Luteinizing hormone causes MAP kinase-dependent phosphorylation and closure of connexin 43 gap junctions in mouse ovarian follicles: one of two paths to meiotic resumption.


ABSTRACT: Luteinizing hormone (LH) acts on ovarian follicles to reinitiate meiosis in prophase-arrested mammalian oocytes, and this has been proposed to occur by interruption of a meioisis-inhibitory signal that is transmitted through gap junctions into the oocyte from the somatic cells that surround it. To investigate this idea, we microinjected fluorescent tracers into live antral follicle-enclosed mouse oocytes, and we demonstrate for the first time that LH causes a decrease in the gap junction permeability between the somatic cells, prior to nuclear envelope breakdown (NEBD). The decreased permeability results from the MAP kinase-dependent phosphorylation of connexin 43 on serines 255, 262 and 279/282. We then tested whether the inhibition of gap junction communication was sufficient and necessary for the reinitiation of meiosis. Inhibitors that reduced gap junction permeability caused NEBD, but an inhibitor of MAP kinase activation that blocked gap junction closure in response to LH did not prevent NEBD. Thus, both MAP kinase-dependent gap junction closure and another redundant pathway function in parallel to ensure that meiosis resumes in response to LH.

SUBMITTER: Norris RP 

PROVIDER: S-EPMC2572224 | biostudies-literature | 2008 Oct

REPOSITORIES: biostudies-literature

altmetric image

Publications

Luteinizing hormone causes MAP kinase-dependent phosphorylation and closure of connexin 43 gap junctions in mouse ovarian follicles: one of two paths to meiotic resumption.

Norris Rachael P RP   Freudzon Marina M   Mehlmann Lisa M LM   Cowan Ann E AE   Simon Alexander M AM   Paul David L DL   Lampe Paul D PD   Jaffe Laurinda A LA  

Development (Cambridge, England) 20081001 19


Luteinizing hormone (LH) acts on ovarian follicles to reinitiate meiosis in prophase-arrested mammalian oocytes, and this has been proposed to occur by interruption of a meioisis-inhibitory signal that is transmitted through gap junctions into the oocyte from the somatic cells that surround it. To investigate this idea, we microinjected fluorescent tracers into live antral follicle-enclosed mouse oocytes, and we demonstrate for the first time that LH causes a decrease in the gap junction permeab  ...[more]

Similar Datasets

| S-EPMC8816813 | biostudies-literature
| S-EPMC5143974 | biostudies-literature
| S-EPMC6275304 | biostudies-literature
| S-EPMC3361999 | biostudies-literature
| S-EPMC6123000 | biostudies-literature
| S-EPMC10137601 | biostudies-literature
| S-EPMC10304740 | biostudies-literature
| S-EPMC9645212 | biostudies-literature
| S-EPMC3937777 | biostudies-literature
| S-EPMC8698406 | biostudies-literature