金银花总皂苷对甲状腺癌TPC-1细胞增殖、侵袭、凋亡及SHP2/Ras/MAPK通路的影响

目的:探讨金银花总皂苷对甲状腺癌TPC-1细胞增殖、侵袭、凋亡及SHP2/Ras/MAPK通路的影响。方法:设甲状腺癌TPC-1细胞组、5-氟尿嘧啶组(500μmol·ml^(-1))、金银花总皂苷低和高剂量组(500μmol·ml^(-1)、1000μmol·ml^(-1)),以上各组每孔设6个平行样,培养72h。试验结束后,应用CCK-8试剂盒测定细胞增殖水平,Transwell室测定细胞侵袭水平,流式细胞仪测定细胞凋亡水平,RT-PCR法及蛋白印迹法测定细胞SHP2、Ras、MAPK mRNA及蛋白水平。结果:与甲状腺癌TPC-1细胞组比较,5-氟尿嘧啶组、金银花总皂苷低、高剂量组OD值、存活率、穿膜数、侵袭距离、SHP2、Ras、MAPK mRNA和蛋白表达水平降低,凋亡率升高(P<0.05)。与5-氟尿嘧啶组比较,金银花总皂苷低剂量组OD值、存活率、穿膜数、侵袭距离、SHP2、Ras、MAPK mRNA和蛋白表达水平升高,凋亡率降低(P<0.05),金银花总皂苷高剂量组OD值、存活率、凋亡率、穿膜数、侵袭距离、SHP2、Ras、MAPK mRNA和蛋白表达水平无明显变化(P>0.05)。与金银花总皂苷低剂量组比较,金银花总皂苷高剂量组OD值、存活率、穿膜数、侵袭距离、SHP2、Ras、MAPK mRNA和蛋白表达水平降低,凋亡率升高(P<0.05)。结论:金银花总皂苷能抑制甲状腺癌细胞的增殖、侵袭并增强其凋亡,其机制可能与金银花总皂苷抑制SHP2/Ras/MAPK信号通路的激活有关。

Mechanisms mediating the effects of alcohol and HIV anti-retroviral agents on mTORC1,mTORC2 and protein synthesis in myocytes

Alcoholism and acquired immune deficiency syndrome are associated with severe muscle wasting.This impairment in nitrogen balance arises from increased protein degradation and a decreased rate of protein synthesis.The regulation of protein synthesis is a complex process involving alterations in the phosphorylation state and protein-protein interaction of various components of the translation machinery and mammalian target of rapamycin(mTOR) complexes.This review describes mechanisms that regulate protein synthesis in cultured C2C12 myocytes following exposure to either alcohol or human immunodeficiency virus antiretroviral drugs.Particular attention is given to the upstream regulators of mTOR complexes and the downstream targets which play an important role in translation.Gaining a better understanding of these molecular mechanisms could have important implications for preventing changes in lean body mass in patients with catabolic conditions or illnesses.

敲降TMEM45A基因对卵巢癌细胞增殖、黏附及侵袭的影响

目的观察跨膜蛋白45A(TMEM45A)基因对卵巢癌细胞增殖、侵袭能力的调节作用,并进一步探索其可能相关信号通路。方法通过分析TCGA数据库卵巢癌组RNA测序数据和25对卵巢癌及其配对非癌组织样本的RT-PCR数据,比较卵巢癌组织和正常组织中TMEM45A的表达。在两种卵巢癌细胞系HO-8910和A2780中进行RNA干扰,抑制TMEM45A的表达;使用CCK-8、PI染色、细胞黏附和Transwell实验检测细胞增殖、细胞周期分布、黏附和侵袭能力;分析TGF-β信号传导途径、粘着斑途径与TMEM45A的高表达的相关性;采用RT-PCR和Western检测TGF-β1、TGF-β2、Rho A、ROCK2 mRNA和蛋白水平。结果 TM EM 45A在卵巢癌中过表达(P<0.001);TM EM 45A基因的沉默抑制了细胞增殖(P<0.05),增加了处于G1期的细胞群(P<0.05);敲降TMEM45A基因可以抑制细胞黏附和侵袭(P<0.05);抑制TMEM45A显著下调TGF-β1/2、Rho A和ROCK2的表达(P<0.05)。结论 TM EM 45A可能是卵巢癌的致癌基因,敲降TM EM 45A基因可能成为卵巢癌的治疗靶点。