title: The expression patterns of pro-apoptotic and anti-apoptotic factors in human fetal and adult ovary.
abstract: The influence of pro-apoptotic Bax and anti-apoptotic Bcl-2 proteins on the cell death (caspase-3, TUNEL) of different ovarian cell lineages was immunohistochemically analyzed in six fetal and five adult human ovaries in order to disclose possible mechanisms of cell number control. Mild to moderate expression of Bcl-2 characterized ovarian surface epithelium, follicular cells and oocytes of 15 and 22 week human ovaries, while expression of Bax and caspase-3 gradually increased in all ovarian cell populations, except caspase-3 in the ovarian surface epithelium. Different levels of Bax and Bcl-2 proteins co-expression characterized fetal ovarian cells, while TUNEL and caspase-3 co-expression was found only in some of them. In adult ovaries, Bcl-2 was moderately and Bax strongly expressed in the surface ovarian epithelium and stroma. Bcl-2 and Bax expression in granulosa and theca interna cells varied depending on the stage of follicular atresia. Caspase-3 apoptotic cells characterized granulosa cells of adult atretic follicles. Our results indicate that intracellular levels of Bcl-2 and Bax protein might regulate the final destiny of developing germ cells. Caspase-3 dependent apoptosis seems to be the most important, but not the only cell death pathway in ovaries. In adult ovaries, caspase-dependent cell death characterized granulosa cells, but not the germ cells.
authors.affiliation: Department of Anatomy, Histology and Embryology, School of Medicine, University of Split, Soltanska 2, 21000 Split, Croatia. ana.poljicanin@mefst.hr
authors.forename: Ana
authors.initials: A
authors.lastname: Poljicanin
authors.forename: Tanja
authors.initials: T
authors.lastname: Vukusic Pusic
authors.forename: Katarina
authors.initials: K
authors.lastname: Vukojevic
authors.forename: Ana
authors.initials: A
authors.lastname: Caric
authors.forename: Katarina
authors.initials: K
authors.lastname: Vilovic
authors.forename: Snjezana
authors.initials: S
authors.lastname: Tomic
authors.forename: Violeta
authors.initials: V
authors.lastname: Soljic
authors.forename: Mirna
authors.initials: M
authors.lastname: Saraga-Babic
mesh_terms: D000367:Age Factors; D017209:Apoptosis / Q000502:physiology*; D053148:Caspase 3 / Q000378:metabolism*; D005260:Female; D005333:Fetus; D005865:Gestational Age; D006801:Humans; D020287:In Situ Nick-End Labeling; D008875:Middle Aged; D010053:Ovary / Q000196:embryology* / Q000378:metabolism*; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000378:metabolism*; D051028:bcl-2-Associated X Protein / Q000378:metabolism*
chemical_list: D019253:Proto-Oncogene Proteins c-bcl-2; D051028:bcl-2-Associated X Protein; D053148:Caspase 3
keywords: Apoptosis; Bax; Bcl-2; Caspase-3; Human fetus; Ovary