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• W2171402651 abstract "A precise regulation of angiogenesis is a prerequisite for an adequate maturation of ovarian follicles. Despite the production of vascular endothelial growth factor (VEGF) by granulosa cells in antral follicles, angiogenesis is restricted to the theca cell layer. The maturing follicle remains avascular before ovulation, implying regulatory mechanisms which prevent premature follicular vascularization. In order to investigate the role of follicular fluid and of granulosa cells in the regulation of endothelial gene expression, human umbilical vein endothelial cells (HUVECs) were incubated in vitro with media conditioned with human follicular fluid obtained from individual patients undergoing oocyte retrieval for in vitro fertilization procedures or with culture medium conditioned by human granulosa cells respectively. Using microarray technology, the gene expression pattern was compared between untreated monolayers of HUVECs and HUVECs treated either with follicular fluid or with granulosa cell conditioned media. We identified a total of 15 genes that were significantly up-regulated and 11 genes that were significantly down-regulated in endothelial cells treated with follicular fluid at least 2.5-fold in more than 70% of comparisons. Up-regulated genes involved in angiogenesis were the anti-angiogenic factors gro-beta (16.5-fold), angiopoietin-2 (3.9-fold), alpha-2-macroglobulin (24.3-fold) and the pro-angiogenic factors E-selectin (5.3-fold) and vascular cell adhesion molecule-1 (VCAM-1) (4.4-fold), whereas a significant down-regulation of the pro-angiogenic genes fibulin-5 (3.5-fold) and elastin (14.9-fold) could be observed. Culturing of HUVECs with conditioned medium from cultured human luteinized granulosa cells demonstrated a similar regulatory pattern of gene expression for fibulin-5, elastin, gro-beta, and E-selectin. The gene regulation in endothelial cells by follicular fluid could be confirmed by RT-PCR for gro-beta, angiopoietin-2, elastin, fibulin-5, and E-selectin. The present work reveals that compounds secreted by granulosa cells lead to the expression of anti-angiogenic factors on the transcript level in endothelial cells and thus could help to explain the temporal and spatial discrepancy between the high expression of VEGF and the restricted angiogenesis in the preovulatory follicle." @default.
• W2171402651 created "2016-06-24" @default.
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• W2171402651 date "2005-02-01" @default.
• W2171402651 modified "2023-10-18" @default.
• W2171402651 title "Regulation of gene expression in endothelial cells: the role of human follicular fluid" @default.
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• W2171402651 doi "https://doi.org/10.1677/jme.1.01589" @default.
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