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The Jackson Laboratory, Bar Harbor, Maine 04609
Address all correspondence and requests for reprints to: Dr. J. J. Eppig, The Jackson Laboratory, 600 Main Street, Bar Harbor, Maine 04609. E-mail: jje{at}jax.org
Normal ovulation in mice requires PG-endoperoxide synthase 2 (cyclooxygenase-2; COX-2) expression. This study examined the role of the oocyte and other factors in regulating steady state levels of COX-2 messenger RNA (mRNA) in granulosa cells. Multiphasic changes in the expression pattern of COX-2 mRNA were found, with peaks of expression 4 and 12 h after hCG treatment. Changes in relative expression levels in cumulus cells and mural granulosa cells occurred over time, with similar mRNA levels at 4 h, but higher levels in cumulus cells compared with mural granulosa cells at 8 and 12 h post-hCG. In cultured mural granulosa cells, LH, FSH, and oocytes promoted COX-2 mRNA expression concurrent with the first expression peak in vivo. At the same time, FSH, but not LH, treatment of cultured cumulus-oocyte complexes (COC) promoted COX-2 mRNA expression in cumulus cells. This response of cumulus cells to FSH treatment was largely dependent on the presence of either fully grown germinal vesicle stage or maturing oocytes, but not growing oocytes. At 8 h, COX-2 mRNA expression in FSH-stimulated COC was lower than at 4 h; however, oocyte coculture promoted COX-2 mRNA expression in cumulus cells. No second peak in expression occurred in cultured COC. However, coculture of COC with follicle walls promoted COX-2 mRNA expression in cumulus cells 12 h post-hCG; an effect augmented by oocytes. Therefore, the oocyte resident within ovulatory follicles produces a factor(s) that promotes expression of COX-2 mRNA by cumulus cells and possibly by mural granulosa cells. Thus, the oocyte probably plays an important role in promoting ovulation. However, the multiphasic changes in the pattern of COX-2 expression appear orchestrated by non-oocyte-derived factors.
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S. A. Ochsner, D. L. Russell, A. J. Day, R. M. Breyer, and J. S. Richards Decreased Expression of Tumor Necrosis Factor-{alpha}-Stimulated Gene 6 in Cumulus Cells of the Cyclooxygenase-2 and EP2 Null Mice Endocrinology, March 1, 2003; 144(3): 1008 - 1019. [Abstract] [Full Text] [PDF] |
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D. L. Russell, S. A. Ochsner, M. Hsieh, S. Mulders, and J. S. Richards Hormone-Regulated Expression and Localization of Versican in the Rodent Ovary Endocrinology, March 1, 2003; 144(3): 1020 - 1031. [Abstract] [Full Text] [PDF] |
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E. Segi, K. Haraguchi, Y. Sugimoto, M. Tsuji, H. Tsunekawa, S. Tamba, K. Tsuboi, S. Tanaka, and A. Ichikawa Expression of Messenger RNA for Prostaglandin E Receptor Subtypes EP4/EP2 and Cyclooxygenase Isozymes in Mouse Periovulatory Follicles and Oviducts During Superovulation Biol Reprod, March 1, 2003; 68(3): 804 - 811. [Abstract] [Full Text] [PDF] |
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L. L. Espey and J. S. Richards Temporal and Spatial Patterns of Ovarian Gene Transcription Following an Ovulatory Dose of Gonadotropin in the Rat Biol Reprod, December 1, 2002; 67(6): 1662 - 1670. [Abstract] [Full Text] [PDF] |
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R. A. Taft, J. M. Denegre, F. L. Pendola, and J. J. Eppig Identification of Genes Encoding Mouse Oocyte Secretory and Transmembrane Proteins by a Signal Sequence Trap Biol Reprod, September 1, 2002; 67(3): 953 - 960. [Abstract] [Full Text] [PDF] |
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S. Varani, J. A. Elvin, C. Yan, J. DeMayo, F. J. DeMayo, H. F. Horton, M. C. Byrne, and M. M. Matzuk Knockout of Pentraxin 3, a Downstream Target of Growth Differentiation Factor-9, Causes Female Subfertility Mol. Endocrinol., June 1, 2002; 16(6): 1154 - 1167. [Abstract] [Full Text] [PDF] |
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J. J. Eppig, K. Wigglesworth, and F. L. Pendola The mammalian oocyte orchestrates the rate of ovarian follicular development PNAS, February 20, 2002; (2002) 52658699. [Abstract] [Full Text] [PDF] |
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J. S. Richards, D. L. Russell, S. Ochsner, M. Hsieh, K. H. Doyle, A. E. Falender, Y. K. Lo, and S. C. Sharma Novel Signaling Pathways That Control Ovarian Follicular Development, Ovulation, and Luteinization Recent Prog. Horm. Res., January 1, 2002; 57(1): 195 - 220. [Abstract] [Full Text] [PDF] |
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J. J. Eppig, K. Wigglesworth, and F. L. Pendola The mammalian oocyte orchestrates the rate of ovarian follicular development PNAS, March 5, 2002; 99(5): 2890 - 2894. [Abstract] [Full Text] [PDF] |
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