title: Notch signaling regulates ovarian follicle formation and coordinates follicular growth.
abstract: Ovarian follicles form through a process in which somatic pregranulosa cells encapsulate individual germ cells from germ cell syncytia. Complementary expression of the Notch ligand, Jagged1, in germ cells and the Notch receptor, Notch2, in pregranulosa cells suggests a role for Notch signaling in mediating cellular interactions during follicle assembly. Using a Notch reporter mouse, we demonstrate that Notch signaling is active within somatic cells of the embryonic ovary, and these cells undergo dramatic reorganization during follicle histogenesis. This coincides with a significant increase in the expression of the ligands, Jagged1 and Jagged2; the receptor, Notch2; and the target genes, Hes1 and Hey2. Histological examination of ovaries from mice with conditional deletion of Jagged1 within germ cells (J1 knockout [J1KO]) or Notch2 within granulosa cells (N2 knockout [N2KO]) reveals changes in follicle dynamics, including perturbations in the primordial follicle pool and antral follicle development. J1KO and N2KO ovaries also contain multi-oocytic follicles, which represent a failure to resolve germ cell syncytia, and follicles with enlarged oocytes but lacking somatic cell growth, signifying a potential role of Notch signaling in follicle activation and the coordination of follicle development. We also observed decreased cell proliferation and increased apoptosis in the somatic cells of both conditional knockout lines. As a consequence of these defects, J1KO female mice are subfertile; however, N2KO female mice remain fertile. This study demonstrates important functions for Jagged1 and Notch2 in the resolution of germ cell syncytia and the coordination of somatic and germ cell growth within follicles of the mouse ovary.
authors.affiliation: Department of Molecular Biosciences and Center for Reproductive Science, Northwestern University, Evanston, Illinois 60208.
authors.forename: Dallas A
authors.initials: DA
authors.lastname: Vanorny
authors.forename: Rexxi D
authors.initials: RD
authors.lastname: Prasasya
authors.forename: Abha J
authors.initials: AJ
authors.lastname: Chalpe
authors.forename: Signe M
authors.initials: SM
authors.lastname: Kilen
authors.forename: Kelly E
authors.initials: KE
authors.lastname: Mayo
mesh_terms: D000818:Animals; D017209:Apoptosis; D002135:Calcium-Binding Proteins / Q000378:metabolism; D049109:Cell Proliferation; D005260:Female; D017353:Gene Deletion; D018507:Gene Expression Regulation, Developmental; D017930:Genes, Reporter; D005854:Germ Cells / Q000378:metabolism; D006107:Granulosa Cells / Q000166:cytology / Q000378:metabolism; D049452:Green Fluorescent Proteins / Q000378:metabolism; D036341:Intercellular Signaling Peptides and Proteins / Q000378:metabolism; D000072100:Jagged-1 Protein; D008565:Membrane Proteins / Q000378:metabolism; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D009865:Oocytes / Q000378:metabolism; D009928:Organ Specificity; D006080:Ovarian Follicle / Q000166:cytology / Q000254:growth & development* / Q000378:metabolism*; D051883:Receptor, Notch2 / Q000172:deficiency / Q000378:metabolism*; D000072099:Serrate-Jagged Proteins; D015398:Signal Transduction
chemical_list: D002135:Calcium-Binding Proteins; D036341:Intercellular Signaling Peptides and Proteins; C000606274:Jag1 protein, mouse; D000072100:Jagged-1 Protein; D008565:Membrane Proteins; C497765:Notch2 protein, mouse; D051883:Receptor, Notch2; D000072099:Serrate-Jagged Proteins; C485184:enhanced green fluorescent protein; D049452:Green Fluorescent Proteins