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- W2078460274 abstract "Abstract MicroRNAs (miRs) are small noncoding RNAs that principally function in the spatiotemporal regulation of protein translation in animal cells. Although emerging evidence suggests that some miRs play important roles in osteoblastogenesis and skeletal homeostasis, much less is known in osteoclastogenesis. Here, we show that receptor activator of nuclear factor κB ligand (RANKL)–induced osteoclastogenesis is mediated by miR-21. MiR-21 was identified as an miR expression signature of RANKL-induced osteoclastogenesis that down-regulates programmed cell death 4 (PDCD4) protein levels. Diminished PDCD4 removes a repression from c-Fos, a critical transcription factor for osteoclastogenesis and osteoclast-specific downstream target genes. In addition, RANKL-induced c-Fos up-regulates miR-21 gene expression. Bone marrow–derived monocyte/macrophage precursors deficient of DiGeorge syndrome critical region gene 8, an RNA binding protein associated with miR biogenesis, and Dicer, an endoribonuclease in the RNaseIII family associated with miR biogenesis, possessed significantly decreased miR-21 levels and increased PDCD4 protein levels so that RANKL-induced osteoclastogenesis was impaired in those cells. However, forced expression of miR-21 rescued osteoclast development because of down-regulation of PDCD4 protein expression levels. Thus, our studies provide a new molecular mechanism, including a positive feedback loop of c-Fos/miR-21/PDCD4, regulating osteoclastogenesis." @default.
- W2078460274 created "2016-06-24" @default.
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- W2078460274 date "2011-03-31" @default.
- W2078460274 modified "2023-09-30" @default.
- W2078460274 title "A microRNA expression signature of osteoclastogenesis" @default.
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- W2078460274 doi "https://doi.org/10.1182/blood-2010-10-311415" @default.
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