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- W2023271699 abstract "Granulosa cells constitute the ovarian follicular epithelium which at the beginning of folliculogenesis forms a single layer of flattened cells. As the follicle matures the cells acquire a cuboidal morphology, proliferate and differentiate into the cumulus cells surrounding the oocyte, and the mural granulosa cells forming the inner layer of the follicle (the membrana granulosa). Mural granulosa cells may further differ in their functionality depending on whether they are situated apically or basally within the stratified membrana granulosa. Late in folliculogenesis granulosa cells develop the ability to produce oestradiol, and also a specialised extracellular matrix (focimatrix) which is more abundant between apical cells. In order to investigate possible differences between granulosa cells, the expression of genes for oestradiol synthesis (CYP11A1, CYP19A1), focimatrix components (LAMB2, COL4A1, HSPG2), FSH and LH receptors, and cell cycle genes (CCND2, CCNE1, CCNE2, CDKN1B, CDKN2D) were examined in apical and basal granulosa cells from large healthy bovine follicles [n = 18, 14.3 ± 0.3 mm (mean + SEM)] using quantitative RT-PCR. Apical granulosa cells were collected by flushing the follicle with balanced salt solution. The remaining cells were detached from the follicular basal lamina by gently scraping; these are the basal granulosa cells. This collection method resulted in equivalent cell yields of apical and basal cells. Expression for all genes was significantly higher in basal cells in comparison to apical cells (P < 0.05), except for the cycle genes CCND2 and CDKN2D, which did not differ between cell populations. These results suggest that functional heterogeneity exists within the membrana granulosa. How differences between apical and basal cells are established is unknown but may be due to the proximity of the basal cells to the follicular basal lamina. The relevance of this aspect of follicle maturation to the endocrine function of granulosa cells has yet to be determined." @default.
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- W2023271699 date "2010-01-01" @default.
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- W2023271699 title "143. DIFFERENCES IN GENE EXPRESSION BETWEEN APICAL AND BASAL CELLS OF THE MEMBRANA GRANULOSA" @default.
- W2023271699 doi "https://doi.org/10.1071/srb10abs143" @default.
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