title: Cooperative effects of 17β-estradiol and oocyte-derived paracrine factors on the transcriptome of mouse cumulus cells.
abstract: Oocyte-derived paracrine factors (ODPFs) and estrogens are both essential for the development and function of ovarian follicles in mammals. Cooperation of these two factors was assessed in vitro using intact cumulus-oocyte complexes, cumulus cells cultured after the removal of oocytes [oocytectomized (OOX) cumulus cells], and OOX cumulus cells cocultured with denuded oocytes, all in the presence or absence of 17β-estradiol (E2). Effects on the cumulus cell transcriptome were assessed by microarray analysis. There was no significant difference between the cumulus cell transcriptomes of either OOX cumulus cells cocultured with oocytes or intact cumulus-oocyte complexes. Therefore, oocyte-mediated regulation of the cumulus cell transcriptome is mediated primarily by ODPFs and not by gap junctional communication between oocytes and cumulus cells. Gene ontology analysis revealed that both ODPFs and E2 strongly affected the biological processes associated with cell proliferation in cumulus cells. E2 had limited effects on ODPF-regulated biological processes. However, in sharp contrast, ODPFs significantly affected biological processes regulated by E2 in cumulus cells. For example, only in the presence of ODPFs did E2 significantly promote the biological processes related to phosphorylation-mediated signal transduction in cumulus cells, such as the signaling pathways of epidermal growth factor, vascular endothelial growth factor, and platelet-derived growth factor. Therefore, ODPFs and E2 cooperate to regulate the cumulus cell transcriptome and, in general, oocytes modulate the effects of estrogens on cumulus cell function.
authors.affiliation: PhD, Laboratory of Applied Genetics, Graduate School of Agriculture and Life Sciences, The University of Tokyo, 1-1-1 Yayoi, Bunkyoku, Tokyo, 113-8657, Japan. aks@mail.ecc.u-tokyo.ac.jp.
authors.forename: Chihiro
authors.initials: C
authors.lastname: Emori
authors.forename: Karen
authors.initials: K
authors.lastname: Wigglesworth
authors.forename: Wataru
authors.initials: W
authors.lastname: Fujii
authors.forename: Kunihiko
authors.initials: K
authors.lastname: Naito
authors.forename: John J
authors.initials: JJ
authors.lastname: Eppig
authors.forename: Koji
authors.initials: K
authors.lastname: Sugiura
mesh_terms: D000818:Animals; D054885:Cumulus Cells / Q000378:metabolism*; D004958:Estradiol / Q000494:pharmacology*; D005260:Female; D005786:Gene Expression Regulation / Q000187:drug effects; D036341:Intercellular Signaling Peptides and Proteins / Q000494:pharmacology*; D051379:Mice; D009865:Oocytes / Q000378:metabolism*; D040081:Protein Array Analysis; D059467:Transcriptome / Q000502:physiology*
chemical_list: D036341:Intercellular Signaling Peptides and Proteins; D004958:Estradiol
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