title: Knockdown of dishevelled-1 attenuates cyclosporine A-induced apoptosis in H9c2 cardiomyoblast cells.
abstract: Cyclosporine (CsA) has become a mainstay for immune suppression of organ transplants. It is known that patients receiving CsA manifest increased growth of aggressive cardiotoxicity. We have demonstrated that CsA induces myocardium cell apoptosis in vivo and vitro. Recently, dishevelled-1 (Dvl-1) protein, which is a cytoplasmic mediator of Wnt/β-catenin signaling, was explored in cardiac diseases. However, whether Dvl-1 is involved in CsA-induced apoptosis remains to be determined. The aim of this study was to explore the role of Dvl-1 in CsA-induced apoptosis in H9c2 cardiomyoblast cells and to investigate the role of the Wnt/β-catenin signaling cascade in this progress. H9c2 cells were treated with CsA in dose and time-dependent manners. We found that the appropriate concentrations and time-points of CsA-induced the expression of Dvl-1 and subsequent up-regulation of β-catenin and c-Myc, which is consistent with previously demonstrated concentrations and time-points when H9c2 cells apoptosis occurred. Then, cells were transfected with small interfering RNA (siRNA) against Dvl-1 and stimulated with previously demonstrated concentration of CsA. Dvl-1 down-regulation decreased the apoptotic rate, caspase-3 activity, and the Bax/Bcl-2 ratio in H9c2 cells treated with CsA. Furthermore, knocking down the expression of Dvl-1 partially suppressed the activity of the Wnt/β-catenin pathway. Moreover, we further deleted the downstream member β-catenin by specific siRNA, and found that CsA-induced the Bax/Bcl-2 ratio and the expression of c-Myc, which were attenuated. Our results are the first to unveil this novel aspect of Dvl-1 signaling. In addition, these data provide insight into the pathogenesis and the therapeutic strategies of CsA-induced myocardial injury.
authors.affiliation: Department of Cardiology, The First Affiliated Hospital of Harbin Medical University, No. 23, YouZheng Street, NanGang District, Harbin, 150001, Heilongjiang Province, People's Republic of China.
authors.forename: Yejing
authors.initials: Y
authors.lastname: Zhu
authors.forename: Jinyu
authors.initials: J
authors.lastname: Chi
authors.forename: Yue
authors.initials: Y
authors.lastname: Liu
authors.forename: Yihua
authors.initials: Y
authors.lastname: Sun
authors.forename: Yu
authors.initials: Y
authors.lastname: Fu
authors.forename: Xiaohui
authors.initials: X
authors.lastname: Zhang
authors.forename: Xueliang
authors.initials: X
authors.lastname: Ding
authors.forename: Xinhua
authors.initials: X
authors.lastname: Yin
authors.forename: Dechao
authors.initials: D
authors.lastname: Zhao
mesh_terms: D048868:Adaptor Proteins, Signal Transducing / Q000235:genetics / Q000378:metabolism*; D000818:Animals; D017209:Apoptosis / Q000187:drug effects* / Q000235:genetics; D053148:Caspase 3 / Q000378:metabolism; D002478:Cells, Cultured; D016572:Cyclosporine / Q000494:pharmacology*; D000072261:Dishevelled Proteins; D015536:Down-Regulation; D004791:Enzyme Inhibitors / Q000494:pharmacology; D032386:Myoblasts, Cardiac / Q000378:metabolism*; D010750:Phosphoproteins / Q000235:genetics / Q000378:metabolism*; D016271:Proto-Oncogene Proteins c-myc / Q000378:metabolism; D051381:Rats; D017382:Reactive Oxygen Species; D015854:Up-Regulation; D051153:Wnt Proteins / Q000378:metabolism; D060449:Wnt Signaling Pathway; D051028:bcl-2-Associated X Protein / Q000378:metabolism; D051176:beta Catenin / Q000378:metabolism
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D000072261:Dishevelled Proteins; C000606580:Dvl1 protein, rat; D004791:Enzyme Inhibitors; D010750:Phosphoproteins; D016271:Proto-Oncogene Proteins c-myc; D017382:Reactive Oxygen Species; D051153:Wnt Proteins; D051028:bcl-2-Associated X Protein; D051176:beta Catenin; D016572:Cyclosporine; D053148:Caspase 3