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In the present investigation, bovine ovary prenatal development was studied using immunohistochemistry and laser-assisted microdissection (LAM). A major aim of this study was to evaluate the protein expression pattern of intermediate filaments (IF) and distinguish S100 protein (S100 alpha and S100 beta protein) isoforms during prenatal follicle differentiation, subsequently correlating them with germ cell marker expression. A development-specific expression pattern of different keratins as well as vimentin was detected in the prenatal bovine ovary; K18-specific expression was found during all developmental stages (i.e. in surface epithelium, germ cell cord somatic cells, and follicle cells), and keratins 5, 7, 8, 14, and 19 and vimentin had a stage-specific expression pattern in the different cell populations of the prenatal ovaries. Additionally, our results represent new data on the expression pattern of germ cell markers during bovine ovary prenatal development. S100 alpha and beta protein was localized to oocyte cytoplasm of different follicle stages, and S100 alpha staining could be observed in granulosa cells. Furthermore, through isolation of characteristic ovary cell populations using LAM, specific confirmation of some genes of interest (KRT8, KRT18, S100 alpha, S100 beta, and OCT4, DDX4) could be obtained by RT-PCR in single cell groups of the developing bovine ovary.

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Expression of Intermediate Filaments and Germ Cell Markers in the Developing Bovine Ovary: An Immunohistochemical and Laser-Assisted Microdissection Study