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• W2025334893 abstract "MicroRNAs (miRNAs) play important roles in many developmental processes, including cell differentiation and apoptosis. Transition of proliferative ovarian granulosa cells to terminally differentiated luteal cells in response to the ovulatory surge of luteinizing hormone (LH) involves rapid and pronounced changes in cellular morphology and function. MicroRNA 21 (miR-21, official symbol Mir21) is one of three highly LH-induced miRNAs in murine granulosa cells, and here we examine the function and temporal expression of Mir21 within granulosa cells as they transition to luteal cells. Granulosa cells were transfected with blocking (2′-O-methyl) and locked nucleic acid (LNA-21) oligonucleotides, and mature Mir21 expression decreased to one ninth and one twenty-seventh of its basal expression, respectively. LNA-21 depletion of Mir21 activity in cultured granulosa cells induced apoptosis. In vivo, follicular granulosa cells exhibit a decrease in cleaved caspase 3, a hallmark of apoptosis, 6 h after the LH/human chorionic gonadotropin surge, coincident with the highest expression of mature Mir21. To examine whether Mir21 is involved in regulation of apoptosis in vivo, mice were treated with a phospho thioate-modified LNA-21 oligonucleotide, and granulosa cell apoptosis was examined. Apoptosis increased in LNA-21-treated ovaries, and ovulation rate decreased in LNA-21-treated ovaries, compared with their contralateral controls. We have examined a number of Mir21 apoptotic target transcripts identified in other systems; currently, none of these appear to play a role in the induction of ovarian granulosa cell apoptosis. This study is the first to implicate the antiapoptotic Mir21 (an oncogenic miRNA) as playing a clear physiologic role in normal tissue function." @default.
• W2025334893 created "2016-06-24" @default.
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• W2025334893 date "2010-08-01" @default.
• W2025334893 modified "2023-09-27" @default.
• W2025334893 title "MicroRNA 21 Blocks Apoptosis in Mouse Periovulatory Granulosa Cells1" @default.
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• W2025334893 doi "https://doi.org/10.1095/biolreprod.109.081448" @default.
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