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    Please use this identifier to cite or link to this item: http://ir.cnu.edu.tw/handle/310902800/29558


    標題: Tanshinone IIA Prevents Leu27IGF-II-Induced Cardiomyocyte Hypertrophy Mediated by Estrogen Receptor and Subsequent Akt Activation
    作者: Weng, Yueh-Shan
    Wang, Hsueh-Fang
    Pai, Pei-Ying
    Jong, Gwo-Ping
    Lai, Chao-Hung
    Chung, Li-Chin
    Hsieh, Dennis Jine-Yuan
    HsuanDay, Cecilia
    Kuo, Wei-Wen
    Huang, Chih-Yang
    貢獻者: 醫務管理系(所)
    關鍵字: Tanshinone IIA
    Selective Estrogen Receptor Modulator
    IGF-II Receptor
    Cardiac Hypertrophy
    Calcineurin/NFAT3
    p-akt
    日期: 2015
    上傳時間: 2016-04-19 19:00:12 (UTC+8)
    出版者: World Scientific Publ Co Pte Ltd
    摘要: IGF-IIR plays important roles as a key regulator in myocardial pathological hypertrophy and apoptosis, which subsequently lead to heart failure. Salvia miltiorrhiza Bunge (Danshen) is a traditional Chinese medicinal herb used to treat cardiovascular diseases. Tanshinone IIA is an active compound in Danshen and is structurally similar to 17 beta-estradiol (E-2). However, whether tanshinone IIA improves cardiomyocyte survival in pathological hypertrophy through estrogen receptor (ER) regulation remains unclear. This study investigates the role of ER signaling in mediating the protective effects of tanshinone IIA on IGF-IIR-induced myocardial hypertrophy. Leu27IGF-II (IGF-II analog) was shown in this study to specifically activate IGF-IIR expression and ICI 182,780 (ICI), an ER antagonist used to investigate tanshinone IIA estrogenic activity. We demonstrated that tanshinone IIA significantly enhanced Akt phosphorylation through ER activation to inhibit Leu27IGF-II-induced calcineurin expression and subsequent NFATc3 nuclear translocation to suppress myocardial hypertrophy. Tanshinone IIA reduced the cell size and suppressed ANP and BNP, inhibiting antihypertrophic effects induced by Leu27IGF-II. The cardioprotective properties of tanshinone IIA that inhibit Leu27IGF-II-induced cell hypertrophy and promote cell survival were reversed by ICI. Furthermore, ICI significantly reduced phospho-Akt, Ly294002 (PI3K inhibitor), and PI3K siRNA significantly reduced the tanshinone IIA-induced protective effect. The above results suggest that tanshinone IIA inhibited cardiomyocyte hypertrophy, which was mediated through ER, by activating the PI3K/Akt pathway and inhibiting Leu27IGF-II-induced calcineurin and NFATC3. Tanshinone IIA exerted strong estrogenic activity and therefore represented a novel selective ER modulator that inhibits IGF-IIR signaling to block cardiac hypertrophy.
    Appears in Collections:[醫務管理系(所)] 期刊論文

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