Novel functional proteins interact with midkine in hepatic cancer cells
Novel functional proteins interact with midkine in hepatic cancer cells作者机构:Department of Hepatobiliary and Pancreatic Surgery Huzhou Central Hospital Huzhou 313000 China Division of Hepatobiliary and Pancreatic Surgery First Affiliated Hospital Zhejiang University School of Medicine Hangzhou 310003 China Huzhou Key Laboratory of Molecular Medicine Affiliated Central Hospital of Huzhou Teachers College Huzhou 313000 China
出 版 物:《Hepatobiliary & Pancreatic Diseases International》 (国际肝胆胰疾病杂志(英文版))
年 卷 期:2012年第11卷第3期
页 面:272-277页
核心收录:
学科分类:1002[医学-临床医学] 100214[医学-肿瘤学] 10[医学]
基 金:supported by grants from the National Natural Science Foundation of China (30772534) the Natural Science Foundation of Huzhou (2010YS05)
主 题:midkine yeast two-hybrid interaction hepatic cancer cell
摘 要:BACKGROUND: Midkine is a heparin-binding growth factor that promotes the proliferation, survival, migration and differentiation of various target cells. Midkine plays an important role in tumorigenesis and tumor progression, and is overexpressed in many human malignant tumors. Patients with high tumor midkine expression frequently have a worse prognosis than those with low expression. The present study was designed to investigate the interaction network of midkine in hepatic cancer cells, and to elucidate its role in hepatocellular carcinoma. METHODS: DNA encoding full-length midkine was cloned into pDBLeu vector to serve as bait in yeast two-hybrid screening to identify interacting proteins. Candidate proteins were examined on SC-Leu-Trp-His+3-AT (20 mmol/L) plates and assayed for X-gal activity, then sequenced and classified according to the GenBank. Finally, identified proteins were expressed by the in vitro expression system pCMVTnT, and protein interactions were confirmed by co-immunoprecipitation. RESULTS: Using the yeast two-hybrid system, we found 6 proteins that interacted with midkine: NK-kappa-B inhibitor alpha (I-κ-B-α), Dvl-binding protein naked cuticle 2, granulin, latent active TGF-β binding protein 3, latent active TGF-β binding protein 4, and phospholipid scramblase 1. In vitro co-immunoprecipitation demonstrated that all identified proteins directly interacted with midkine.CONCLUSION: The identification of midkine-interacting proteins in hepatic cancer cells indicates that midkine is a multifunctional factor that may participate in cell migration, differentiation, and proliferation, and is also associated with the multicellular response feedback during the development of hepatocellular carcinoma.