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    ASIA unversity > 醫學暨健康學院 > 期刊論文 >  Item 310904400/6783

    Please use this identifier to cite or link to this item: http://asiair.asia.edu.tw/ir/handle/310904400/6783

    Title: Enhancement of AG1024-Induced H9c2 Cardiomyoblast Cell Apoptosis via the Interaction of IGF2R with Gα Proteins and Its Downstream PKA and PLC-β Modulators by IGF-II
    Authors: Chun-Hsien Chu;Chih-Yang Huang;Ming-Chin Lu;Lin, Tzu-En;Fuu-Jen Tsai;Chang-Hai Tsai;Chia-Yih Chu;Wu-Hsien Kuo;Li-Mien Chen;Ling-Yun Chen
    Date: 2008-03
    Issue Date: 2009-12-23 14:22:19 (UTC+8)
    Publisher: Asia University
    Abstract: Our previous studies found that insulin-like growth factor-I receptor (IGF1R) signaling blockade caused cardiac hypertrophy, and that apoptosis is required for upregulating the IGF-II and the IGF-II/ mannose 6-phosphate receptor (IGF2R) gene. However, the role of IGF-II in the regulation of cell apoptosis through IGF2R is hardly understood. In this study, we hypothesized that IGF-II may induce cell apoptosis through IGF2R but is dependent on IGF1R activity. Western blots and TUNEL assay revealed that in the presence of IGF1R, exogenous IGF-II acts, like IGF-I, to increase phospho-Akt through IGF1R, but does not affect the caspase 3 activation and apoptotic induction in H9c2 cardiomyoblast cells. Conversely, AG1024, an inhibitor of IGF1R activity, causes cell apoptosis, and the treatment with IGF-II further enhances this process, implying that it occurs through IGF2R. Moreover, immunoprecipitation assay revealed that treatment with IGF-II could enhance the interaction of IGF2R with Gαi and Gαq but reduce its binding with Gαs, resulting in the reduction of phospho-PKA and the activation of PLC-β. Taken together, these data provide new insight into the dual role of IGF-II in the control of IGF1R dependent cell apoptosis and involved activation of IGF2R signaling. Improving
    IGF1R activity and suppressing IGF2R may be a good strategy to prevent the progression of heart disease with cardiomyocyte apoptosis.
    Relation: CHINESE JOURNAL OF PHYSIOLOGY 52 (1): 1-7
    Appears in Collections:[醫學暨健康學院] 期刊論文

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