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• W2163492007 abstract "Ovulation (i.e., the release of mature oocytes from the ovary) requires spatially targeted follicle rupture at the apex. Both progesterone and prostaglandins play key roles in the ovulatory process. We have studied follicle rupture and ovulation in adult cycling rats treated with a progesterone receptor antagonist (RU486), an inhibitor of prostaglandin synthesis (indomethacin, IM), or both. All rats were treated with LHRH antagonist on the morning (0900 h) of proestrus to inhibit endogenous gonadotropins and with 10 μg of ovine LH (oLH) at 1700 h in proestrus to induce ovulation. Animals were treated from metestrus to proestrus with 2 mg/day of RU486 or vehicle (olive oil) and on the morning of proestrus (1200 h) with 1 mg of IM or vehicle (olive oil). Some rats treated with vehicle or RU486 were killed on the morning of proestrus to assess preovulatory follicle development. The remaining rats were killed on the morning of estrus to study follicle rupture and ovulation. In vehicle-treated rats, oLH induced ovulation in 98% of follicles. In IM-treated rats, spatial targeting of follicle rupture was disrupted. Most oocytes were released to the ovarian interstitium (50%) or to the periovarian space (39%), and a smaller percentage (11%) of oocytes remained trapped inside the luteinized follicle. RU486-treated rats showed, on the morning of estrus, unruptured luteinized follicles. Only occasionally (2.8%), the oocytes were released to the periovarian space. IM treatment induced follicle rupture in RU486-treated rats, and 25% of oocytes were released to the ovarian interstitium. However, the number of oocytes released to the periovarian space (i.e., ovulated) was not increased by IM treatment in rats lacking progesterone actions. Overall, these data indicate that RU486 and IM have opposite effects on follicle rupture and suggest that both progesterone and prostaglandins are necessary for the spatial targeting of follicle rupture at the apex." @default.
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• W2163492007 date "2003-07-01" @default.
• W2163492007 modified "2023-09-27" @default.
• W2163492007 title "Differential Effects of RU486 and Indomethacin on Follicle Rupture During the Ovulatory Process in the Rat1" @default.
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• W2163492007 doi "https://doi.org/10.1095/biolreprod.102.013755" @default.
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