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Reproductive Endocrinology Center, University of California, San Francisco, California 94143-0556; and the Center for Reproductive Biology, Department of Genetics and Cell Biology, Washington State University, Pullman, Washington 99164-4231
Address all correspondence and requests for reprints to: Dr. Michael K. Skinner, Center for Reproductive Biology, Department of Genetics and Cell Biology, Washington State University, Pullman, Washington 99164-4231. E-mail: skinner{at}mail.wsu.edu
Interactions between mesenchymal-derived thecal cells and epithelial-derived granulosa cells are essential for follicular development in the ovary. These mesenchymal-epithelial cell interactions are in part mediated by keratinocyte growth factor (KGF), hepatocyte growth factor (HGF), and Kit ligand (KL). This study investigates the hypothesis that thecal cell-derived growth factors (e.g. KGF and HGF) regulate granulosa cell function, and granulosa cell-derived growth factors (e.g. KL) regulate thecal cell function. Gonadotropin regulation of this cell-cell interaction is also examined. Sensitive quantitative RT-PCR assays were used to analyze gene expression of KGF, HGF, and KL in the ovary. Thecal cell-derived KGF and HGF stimulated KL expression in bovine granulosa cells. Granulosa cell-derived KL stimulated KGF and HGF expression in bovine thecal cells. These results suggest that thecal and granulosa cells interact in a positive feedback loop mediated by KGF, HGF, and KL. Previous studies have suggested that gonadotropins (i.e. FSH and LH) regulate locally produced growth factor expression in the ovary. Treatment of bovine granulosa cells with FSH and hCG (a LH agonist) directly stimulated KL expression. The LH agonist hCG was also found to stimulate both KGF and HGF expression in thecal cells. The actions of gonadotropins on follicular development may in part be indirectly regulated by KL, KGF, and HGF expression. A novel positive feedback loop was identified between thecal cells and granulosa cells that is mediated by KL, KGF, and HGF. Thecal cell-derived KGF and HGF can stimulate granulosa cell-derived KL expression, and KL, in turn, can stimulate thecal cell-derived KGF and HGF expression. Combined observations support the hypothesis that mesenchymal-epithelial cell interactions between thecal and granulosa cells can play a significant role during ovarian follicular development and mediate gonadotropin actions.
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