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    Please use this identifier to cite or link to this item: http://ir.cnu.edu.tw/handle/310902800/29671


    標題: KMUP-1 Promotes Osteoblast Differentiation Through cAMP and cGMP Pathways and Signaling of BMP-2/Smad1/5/8 and Wnt/-Catenin
    作者: Liou, Shu-Fen
    Hsu, Jong-Hau
    Chu, Hsin-Chieh
    Lin, Hung-Hong
    Chen, Ing-Jun
    Yeh, Jwu-Lai
    貢獻者: 藥學系
    關鍵字: Protein-Kinase-G
    Transcription Factor
    K+ Channels
    Cyclic-Gmp
    Osteoprogenitor Cells
    Rat Osteoblast
    Smooth-Muscle
    Bone Mass
    Involvement
    Expression
    日期: 2015-09
    上傳時間: 2016-04-19 19:04:03 (UTC+8)
    出版者: Wiley-Blackwell
    摘要: Phosphodiesterase (PDE) inhibitors have been suggested as a possible candidate for the treatment of osteopenia, including osteoporosis. KMUP-1 is a novel xanthine derivative with inhibitory activities on the PDE 3, 4, and 5 iso-enzymes to suppress the degradation of cAMP and cGMP. This study aimed to investigate the effect of KMUP-1 on osteoblast differentiation and the underlying cellular and molecular mechanisms. Primary osteoblasts and osteoblastic MC3T3-E1 cells were examined. KMUP-1 enhanced alkaline phosphatase (ALP) activity and mineralization compared to untreated controls in primary osteoblasts and MC3T3-E1 cells. KMUP-1 also increased the mRNA expression of the osteoblastic differentiation markers, including collagen type 1a, ALP, osteocalcin, osteoprotegerin, BMP-2, and Runx2, a key transcription regulator for osteoblastic differentiation. The osteogenic effect of KMUP-1 was abolished by BMP signaling inhibitor, noggin. Furthermore, we found that KMUP-1 upregulated Smad1/5/8 phosphorylations with subsequent BRE-Luc activation confirmed by transient transfection assay. In addition, KMUP-1 inactivated glycogen synthase kinase-3 (GSK-3), with associated nuclear translocation of -catenin. Co-treatment with H89 and KT5823, cAMP and cGMP pathway inhibitors, respectively, reversed the KMUP-1-induced activations of Smad1/5/8, -catenin, and Runx2. The findings demonstrate for the first time that KMUP-1 can promote osteoblast maturation and differentiation in vitro via BMP-2/Smad1/5/8 and Wnt/-catenin pathways. These effects are mediated, in part, by the cAMP and cGMP signaling. Thus, KMUP-1 may be a novel osteoblast activator and a potential new therapy for osteoporosis
    Appears in Collections:[藥學系(所)] 期刊論文

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