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Down-Regulated Expression of A Disintegrin and Metalloproteinase with Thrombospondin-Like Repeats-1 by Progesterone Receptor Antagonist Is Associated with Impaired Expansion of Porcine Cumulus-Oocyte Complexes

Department of Applied Animal Science (M.S., M.N., Y.Y., J.I.), Graduate School of Biosphere Science, Hiroshima University, Hiroshima 739-8528, Japan; Infertility Center (T.M.), Daigo-Watanabe Clinic, Kyoto 601-1375, Japan; and Department of Molecular and Cellular Biology (J.S.R.), Baylor College of Medicine, Houston, Texas 77030

Address all correspondence and requests for reprints to: Masayuki Shimada, Ph.D., Department of Applied Animal Science, Graduate School of Biosphere Science, Hiroshima University, Higashi-Hiroshima, Hiroshima 739-8528, Japan. E-mail: mashimad{at}hiroshima-u.ac.jp.

ADAMTS-1, a member of the A disintegrin and metalloproteinase family of proteases, is expressed in rodent follicles via progesterone receptor (PR)-dependent pathways. However, the functional relationship between ADAMTS-1 expression and PR has not been studied extensively in other species. In the present study, we investigated the time-dependent changes in ADAMTS-1 expression in cumulus cells of porcine cumulus-oocyte complexes (COCs), and the roles of ADAMTS-1 in cumulus expansion during in vitro maturation of oocytes. ADAMTS-1 message was not detected in cumulus cells at the time of collection from the follicles. In response to gonadotropins, ADAMTS-1 mRNA was dramatically up-regulated and reached a maximum at 20 h. The level of mature ADAMTS-1 protein increased in a time-dependent manner with a maximum level at 40 h. The induction of ADAMTS-1 mRNA and protein was significantly decreased by the addition of PR antagonist RU486 to the cultures. However, RU486 did not affect the expression of ADAMTS-4 or factors that had been reported to be required for COC expansion (TSG-6, versican, HA synthase-2). COCs cultured with FSH and LH for 40 h exhibited prominent cumulus expansion. The expansion was reduced significantly by the addition of either RU486 or Galardin, a broad-spectrum matrix metalloproteinase inhibitor. These results suggest that the expression and induction of ADAMTS-1 through receptor-mediated action of progesterone in cumulus cells is one of the essential requirements for gonadotropin-regulated cumulus expansion of porcine COCs.

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