title: Expression and regulation of SNAP-25 and synaptotagmin VII in developing mouse ovarian follicles via the FSH receptor.
abstract: Soluble-NSF attachment protein receptor (SNARE) proteins play a role in vesicle fusion, exocytosis, and intracellular trafficking in neuronal cells as well as in fertilization and embryogenesis. We investigated the expression patterns of two SNARE proteins, SNAP-25 and synaptotagmin VII (SytVII), and their regulation by pregnant mare serum gonadotropin (PMSG) during mouse ovarian follicular development. Ovaries were obtained at 0, 12, 24, 36, and 48 h post-PMSG injection of immature mice. SNAP-25 and SytVII mRNA expression levels increased gradually in a time-dependant manner. However, protein levels revealed different patterns of expression, suggesting different translational regulation following PMSG stimulation. SNAP-25 and SytVII expression was closely associated with thickening of the granulosa cell (GC) layer and follicle morphological changes from a flattened to a cuboidal shape. To explore follicle stimulating hormone receptor (FSHR)-mediated regulation of their expression, GCs from preantral follicles were cultured to examine the effects of FSHR siRNA knockdown. FSHR siRNA abolished upregulation of the SNAREs in both PMSG and FSH-stimulated GCs. This abolished gene expression was rescued by adding dibutyryl cyclic AMP to the cultures. These results suggest that SNAP-25 and SytVII expression is regulated via the FSHR-cAMP pathway during follicular development.
authors.affiliation: School of Life Sciences and Biotechnology, Korea University, Seoul, Korea.
authors.forename: Sung Sik
authors.initials: SS
authors.lastname: Choi
authors.forename: Joo Young
authors.initials: JY
authors.lastname: Jung
authors.forename: Dong Ho
authors.initials: DH
authors.lastname: Lee
authors.forename: Ji Yoon
authors.initials: JY
authors.lastname: Kang
authors.forename: Sang Ho
authors.initials: SH
authors.lastname: Lee
mesh_terms: D000818:Animals; D002478:Cells, Cultured; D005260:Female; D005786:Gene Expression Regulation / Q000187:drug effects; D006062:Gonadotropins / Q000494:pharmacology; D051379:Mice; D006080:Ovarian Follicle / Q000378:metabolism*; D011962:Receptors, FSH / Q000235:genetics / Q000378:metabolism*; D050825:Synaptosomal-Associated Protein 25 / Q000235:genetics / Q000378:metabolism*; D050857:Synaptotagmins / Q000235:genetics / Q000378:metabolism*
chemical_list: D006062:Gonadotropins; D011962:Receptors, FSH; D050825:Synaptosomal-Associated Protein 25; D050857:Synaptotagmins