IL-37通过抑制哺乳动物雷帕霉素靶蛋白(mTOR)的磷酸化而诱导SMMC-7721肝癌细胞凋亡和自噬  

Interleukin-37 induces apoptosis and autophagy of SMMC-7721 cells by inhibiting phosphorylation of mTOR

作　　者：李婷婷[1] 朱迪[1] 牟童[1] 郭振[1] 蒲俊良 吴忠均[1] 

机构地区：[1]重庆医科大学附属第一医院肝胆外科,重庆400016

出　　处：《细胞与分子免疫学杂志》2017年第4期440-445,共6页Chinese Journal of Cellular and Molecular Immunology

基　　金：国家自然科学基金(81672959);重庆市科学技术委员会基金项目(cstc2015shmszx120019)

摘　　要：目的观察白细胞介素37(IL-37)诱导SMMC-7721肝癌细胞凋亡和自噬的机制。方法体外培养SMMC-7721细胞,SMMC-7721细胞分为处理组和对照组,处理组分别予以不同剂量(50、100、200)ng/mL的重组人IL-37(rh IL-37)。CCK-8法检测SMMC-7721细胞增殖能力,流式细胞术检测细胞凋亡,Western blot法检测凋亡和自噬相关蛋白Bax、Bcl-2、微管相关蛋白1轻链3(LC3)和beclin 1及哺乳动物雷帕霉素靶蛋白(mTOR)的水平,透射电子显微镜观察自噬体的形成情况。结果 IL-37可抑制SMMC-7721肝细胞癌细胞的增殖、诱导SMMC-7721细胞凋亡和自噬;IL-37处理组Bax、LC3和beclin 1水平增加,Bcl-2水平降低,mTOR的磷酸化被抑制;可见明显自噬体形成。结论 IL-37可诱导肝细胞癌SMMC-7721细胞发生凋亡和自噬,可能与mTOR的磷酸化有关。Objective To investigate the underlying mechanism by which interleukin-37 （IL-37） induces the apoptosis and autophagy in SMMC-7721 cells. Methods SMMC-7721 cells were incubated in vitro and divided into two groups, IL-37 treated group and control group. The cells were treated with （50, 100, 200） ng/mL of recombinant human intedeuldn-37 （rhlL-37）. CCK-8 assay was used to detect the cell proliferation of SMMC-7721 cells. Cell apoptosis was measured by flow cytometry. Western blot analysis was performed to examine the expressions of apoptosis-related proteins, Bax, Bcl-2, and autophagy related proteins, microtubule-associated proteins 1 light chain 3 （LC3）, beclin 1 and mammalian target of rapamycin （mTOR）. Transmission electron microscopy （TEM） was used to observe the ultrastructures of autophagosomes. Results The rhlL-37 inhibited the proliferation of hepatocellular carcinoma SMMC-7721 cells. It induced the apoptosis and autophagy in SMMC-7721 cells. In the IL-37 treated group, the levels of Bax, LC3 and beclin 1 increased but Bcl-2 decreased. The phosphorylation of mTOR was inhibited in the IL-37 treated group. Autophagosome was obvious in the IL-37 treated group. Conclusion IL-37 induces the apoptosis and autophagy in SMMC-7721 cells, which may be related to the phosphorylaUon of mTOR.

关 键 词：白细胞介素37(IL-37) SMMC-7721细胞 凋亡 自噬 哺乳动物雷帕霉素靶蛋白(mTOR) 

分 类 号：R735.7[医药卫生—肿瘤] R392-33[医药卫生—临床医学]