Survivin反义寡核苷酸对肝癌细胞增殖和凋亡的影响

目的:观察Survivin反义寡核苷酸对SMMC-7721细胞增殖、凋亡的影响。方法:设计合成特异性Survivin反义寡核苷酸,转染肝癌SMMC-7721细胞,MTT法测定Survivin ASODN对细胞增殖抑制情况的影响,FCM法检测对细胞周期、凋亡及Survivin蛋白表达的影响。结果:Survivin ASODN可抑制SMMC-7721细胞的生长增殖,并呈浓度和时间依赖性。ASODN转染组可诱导SMMC-7721细胞凋亡(P<0.01),细胞周期阻滞于G2/M期(P<0.05)。ASODN转染组Survivin蛋白表达水平显著降低(P<0.01)。结论:Survivin ASODN能下调SMMC-7721细胞Survivin表达,并可抑制其增殖并诱导凋亡。     

TSA对人肝癌细胞SMMC-7721的抑制作用及其机制

目的:研究去乙酰化转移酶抑制剂TSA对肝癌细胞SMMC-7721的作用及其机理。方法:利用细胞计数,流式细胞仪分析细胞凋亡及细胞周期,Tunel试验研究TSA对肝癌细胞SMMC-7721的作用;利用western研究TSA对肝癌细胞蛋白表达的影响。结果:TSA可明显抑制肝癌细胞SMMC-7721的生长,并可诱导细胞凋亡。可阻滞肝癌细胞SMMC-7721细胞周期于G0/G1期。可增加p53,p21,bax等基因的表达,降低BCL-2的表达。结论:去乙酰化转移酶抑制剂TSA可明显抑制肝癌细胞SMMC-7721的生长并诱导其凋亡,其主要通过调控一些肿瘤相关基因的表达起作用。     

人剪切修复基因XPD对肝癌细胞生长的抑制作用

目的探讨野生型人剪切修复基因着色性干皮病基因D(xeroderma pigmentosum D,XPD)对肝癌细胞SMMC-7721增殖的影响,并探讨其机制。方法用脂质体转染法瞬时转染SMMC-7721细胞,转染重组质粒XPD-N2和空载质粒N2,并用未转染的与XPD-N2、N2具有相同遗传背景和代数的SMMC-721细胞作为空白对照。荧光显微镜观察绿色荧光蛋白报告基因表达情况,流式细胞仪检测细胞周期,逆转录-聚合酶链反应（RT-PCR）、Western blot法检测细胞中XPD、c-myc、cdc25A、cdK2表达量变化,MTT法观察细胞增殖的活力。结果提取出的重组质粒pEGFP-N2-XPD用酶切鉴定,与Genebank上的相符。在荧光显微镜下,可以在SMMC-7721-pEGFP-N2、SMMC-7721-pEGFP-N2-XPD细胞中观察到绿色荧光蛋白的表达,质粒的转染效率为30%左右。流式细胞仪结果显示,pEGFP-N2-XPD重组质粒转染入细胞后,肝癌细胞进入S期发生阻滞,停滞在G1期。RT-PCR、Western blot检测发现SMMC-7721-pEGFP-N2-XPD细胞与SMMC-7721-pEGFP-N2和SMMC-7721两对照组相比,其XPD 表达明显增高（P<0.05）。c-myc、cdc25A、cdK2相对表达量明显减少,差异有统计学意义（P<0.05）。与两对照组相比,SMMC-7721-pEGFP-N2-XPD细胞增殖率明显减弱（P<0.05）。结论野生型XPD基因可以在转录和翻译水平抑制SMMC-7721细胞内c-myc、cdc25A、cdK2的表达。而且野生型XPD基因通过抑制cdK2的表达作用于S期DNA损伤检控点,从而抑制SMMC-7721细胞增殖。     

Anti-hepatoma cells function of luteolin through inducing apoptosis and cell cycle arrest

The aim of this study is to explore the apoptotic induction and cell cycle arrest function of luteolin on the liver cancer cells and the related mechanism. The liver cancer cell line SMMC-7721, BEL-7402, and normal liver cells HL-7702 were treated with different concentrations of luteolin. Cell proliferation ability was tested. Morphological changes of the apoptotic cells were observed under inverted fluorescence microscope after Hoechst33342 staining. We investigated the effect of luteolin on cell cycling and apoptosis with flow cytometry. The mitochondrial membrane potential changes were analyzed after JC-1 staining. Caspases-3 and Bcl-2 family proteins expression were analyzed by real-time PCR. Cell proliferation of SMMC-7721 and BEL-7402 were inhibited by luteolin, and the inhibition was dose–time-dependent. Luteolin could arrest the cells at G1/S stage, reduce mitochondrial membrane potential, and induce higher apoptosis rate and the typical apoptotic morphological changes of the liver carcinoma cells. Q-RT-PCR results also showed that luteolin increased Bax and caspase-3 expression significantly and upregulated Bcl-2 expression in a dose-dependent manner in liver carcinoma cells. However, the normal liver cells HL-7702 was almost not affected by luteolin treatment. Luteolin can inhibit SMMC-7721 and BEL-7402 cell proliferation in a time- and dose-dependent manner. And the mechanism maybe through arresting cell cycle at phase G1/S, enhancing Bax level, reducing anti-apoptotic protein Bcl-2 level, resulting in activating caspase-3 enzyme and decrease of mitochondrial membrane potential, and finally leading to cell apoptosis.     

抑瘤素M通过诱导衰老抑制肝癌细胞增殖

  目的  通过分析抑瘤素M（oncostatin M,OSM）对肝癌细胞生长的效应,研究其影响细胞增殖的分子机制。  方法  OSM处理SMMC-7721和HepG2肝癌细胞系,观察细胞的增殖速率和形态变化,结合特异性β-半乳糖苷酶染色和细胞周期分析,研究OSM是否通过诱导肝癌细胞进入衰老状态来抑制其增殖;进一步通过监测细胞周期抑制蛋白p16、p21、p27和癌基因c-Myc的表达变化,分析OSM诱导细胞衰老的原因。  结果  OSM可以抑制肝癌细胞系生长,且抑制率呈现一定剂量依赖性;细胞形态变化和β-半乳糖苷酶染色进一步证实OSM可诱导细胞衰老。细胞周期分析表明OSM阻滞肝癌细胞于G₀/G₁期,并伴随p21和p27周期抑制蛋白的表达增高。最后,通过分析STAT3信号途径下游癌基因c-Myc的转录与蛋白水平,表明OSM可能是通过癌基因的激活而诱导细胞的衰老。  结论  由癌基因激活而导致的细胞衰老,是机体的一种防御机制。OSM通过激活STAT3信号途径、上调癌基因cMyc表达的同时,也加速了细胞的衰老,从而最终表现为对肝癌细胞增殖的抑制作用。      

Apoptosis in human hepatoma cell line SMMC-7721 induced by water-soluble macromolecular components of Artemisia capillaris Thunberg.

The aim of this study was to investigate the effect of water-soluble macromolecular components of Artemisia capillaris Thunberg (ACT) on human hepatoma cell line SMMC-7721 (SMMC-7721). The morphological changes of SMMC-7721 were observed under a light microscope and an electron microscope. Inhibition of proliferation was measured with a colorimetric MTT assay. It was discovered that ACT extract-treated cells exhibit morphological changes typical of apoptosis, including condensed chromatin and a reduction in volume. ACT extract at 25-200 microg/ml dose-dependently inhibited the proliferation of SMMC-7721. The 50% effective dose, evaluated on day 3 of exposure to the extract, was 64.52+/-3.53 microg/ml. Upon gel electrophoresis, the fragmented DNA showed a characteristic ladder pattern. Cell cycle analyses revealed that ACT induced cell cycle arrest at the G0/G1 phase.     

薏苡仁油注射液对人体肝癌SMMC-7721细胞株体外抗肿瘤作用及机制研究

目的：研究薏苡仁油注射液（KLT）对人体肝癌SMMC-7721的体外抗肿瘤作用及机制。方法：在人肝癌SMMC-7721细胞模型上采用CCK-8细胞增殖试验、划痕试验、Transwell小室穿膜试验、Matrigel克隆形成试验观察KLT对细胞增殖、迁移及侵袭的影响;应用流式细胞术检测KLT对肿瘤细胞周期及细胞凋亡的影响;Western blot检测KLT对肿瘤细胞中目的基因的表达情况。结果：经KLT作用后的人肝癌细胞生长、迁移及侵袭功能被抑制;流式细胞术检测发现KLT处理的肝癌细胞阻滞于G2/M期,细胞晚期凋亡较明显;KLT上调了cyclin B1的表达,下调了cyclin D1、cyclin E的表达。结论：KLT在体外对肝癌细胞具有良好的抗肿瘤活性,其作用机制可能与其诱导的细胞周期阻滞、细胞凋亡、抑癌基因的上调、癌基因的下调有关。     

水飞蓟宾对人肝癌细胞SMMC-7721体外增殖的影响

目的:探讨水飞蓟宾对SMMC-7721细胞的抗增殖作用。方法:MTT法观察对细胞的抑制作用;免疫细胞化学法检测增殖细胞核抗原(PCNA)及Ki-67的表达;流式细胞仪分析细胞周期及凋亡;光镜及透射电镜观察细胞形态学的变化。结果:水飞蓟宾可抑制SMMC-7721的增殖,并降低PCNA、Ki-67的表达及引起细胞G2/M期阻滞,同时诱导凋亡。光镜发现细胞体积缩小,核固缩深染;电镜可见凋亡及凋亡小体。结论:在体外,水飞蓟宾可抑制SMMC-7721细胞的增殖。     

可溶性肿瘤坏死因子相关凋亡诱导配体诱导肝癌细胞凋亡的研究

方法 采用原位杂交方法检测肝癌组织、肝癌细胞株以及正常肝组织中TRAILR的表达。采用不同浓度TRAIL蛋白处理肝癌细胞株Hep2和SMMC7721,应用流式细胞仪和原位末端标记,观察经药物处理前后该细胞株的凋亡发生率。结果 60例肝癌组织及20例正常肝组织均表达死亡受体DR5和DR4,但肝癌组织DR表达量显著强于正常肝组织。54例(90．0％)肝癌组织不表达诱捕受体DcR1,25例(41．7％)肝癌组织不表达DcR2,而20例正常肝组织均表达DcR。肝癌组织中DR的高表达及DcR的低表达,不同于正常肝组织中DR的低表达及DcR的高表达,两者间差异有显著性。两种肝癌细胞株中均可检测到DR5、DR4、DcR2的表达,但DcR1表达缺失。肝癌组织中DR的表达与肿瘤的分化、肿瘤分期有关,低分化的肿瘤DR表达减少(P＜0．01),Ⅲ、Ⅳ期肿瘤DR表达显著低于I、Ⅱ期(P＜0．05)。DR表达与患者的性别、年龄、HBsAg阳性与否、AFP水平、肿瘤大小以及是否转移无关。经TRAIL(100ng/ml)处理24h,肝癌细胞凋亡发生率约10％,而Jurkat细胞凋亡率达70％以上,胆管癌细胞QBC939凋亡发生率约50％。结论 肝细胞肝癌普遍存在TRAILR的表达,并存在受体类型的表达差异。但单一的TRAIL治疗只能有限的诱导肝癌细胞HepG2、SMMC7721发生凋亡,HCC对TRAIL诱导的凋亡存在耐药现象。     

三种癌细胞对Ad-E1A的敏感程度研究

目的：研究腺病毒介导的E1A基因（Ad-E1A）体外对Hep-2人喉癌细胞、A375人黑色素瘤细胞、SMMC-7721人肝癌细胞的生长抑制作用及敏感程度。方法：RT-PCR鉴定E1A基因的转录;MTT法检测细胞的生长抑制作用;Hoechst染色法检测细胞核形态改变;流式细胞术（FCM）检测细胞周期和细胞凋亡。结果：Ad-E1A在三种癌细胞内均有效表达,在其感染72h和96h后对Hep-2、A375、SMMC-7721细胞的生长抑制率达分别为18.65%和29.95%;33.02%和45.36%;36.32%和54.11%;其中对SMMC-7721细胞的作用最强,FCM 检测发现其凋亡率为36.92%。Hoechst染色表明Ad-E1A诱导肿瘤细胞凋亡,使其呈现典型的核固缩、断裂并出现凋亡小体等核形态改变。结论：Ad-E1A对Hep-2、A375、SMMC-7721三种癌细胞均有生长抑制作用,尤以对SMMC-7721细胞作用最强、A375细胞次之, Hep-2细胞的敏感性相对较低;此外,Ad-E1A还能诱导肿瘤细胞凋亡。     

Survivin反义寡核苷酸诱导SMMC-7721细胞凋亡及对化疗药物敏感性作用的研究

目的：观察survivin反义寡核苷酸（ASODN）对SMMC-7721细胞增殖、凋亡的影响及其对化疗药物敏感性的作用。方法：设计合成特异性survivin的ASODN，脂质体转染肝细胞癌SMMC-7721细胞，透射电镜观察细胞超微结构变化；RT—PCR法检测survivinmRNA的表达变化；FCM法检测对细胞周期、凋亡及survivin蛋白表达的影响；MTT法测定survivin表达抑制前后细胞对吡柔比星、氟苷、顺铂敏感性的影响。结果：ASODN转染后细胞呈现凋亡的形态学改变，survivin mRNA和蛋白表达减弱（P〈0．05），诱导SMMC-7721细胞凋亡（P〈0．01），细胞周期阻滞于G2／M期（P〈0．05）。ASODN转染组可增加SMMC-7721细胞对吡柔比星、氟苷、顺铂的敏感性（P〈0、01）。结论：Survivin ASODN转染能下调survivin表达，诱导SMMC-7721细胞凋亡，提高对吡柔比星、氟苷、顺铂的敏感性。     

The effect of NET-1 on the proliferation, migration and endocytosis of the SMMC-7721 HCC cell line

To explore the effect of NET-1 on the proliferation, migration and endocytosis in the hepatocellular carcinoma (HCC) cell line SMMC-7721, we constructed the pU6H1-NET-1-siRNA (NET-1siRNA) and pcDNA3.1/myc-NET-1 (myc-NET-1) vectors and transfected them into SMMC-7721 cells. The expression levels of NET-1 mRNA and protein were detected using real-time quantitative RT-QPCR and western blotting. The proliferation rates of SMMC-7721 cells were determined by CCK-8 assays, flow cytometry (FCM) and immunohistochemistry staining. The migration in two or three dimensional space of SMMC-7721 cells were determined by wound-healing assay and in vitro invasion assay. The extent of endocytosis in SMMC-7721 cells was estimated by observing the amount of transferrin (Tfn) absorbed with capture ELISA assays, and Tfn endocytosis was observed under confocal immunofluorescence microscopy. The results show that: i) after transfecting NET-1 siRNA, the expression of NET-1 mRNA and protein in SMMC-7721 cells decreased significantly, the growth of cells was suppressed, which induced cell cycle arrest, the proliferation rates were dramatically reduced and the expression of Ki67 declined, and migration and endocytosis in cells were inhibited, compared with untreated cells (every P<0.01); ii) Following transfection with myc-NET-1, the expression of NET-1 mRNA and protein in SMMC-7721 cells increased, and both the proliferation of cells and the cell cycle were promoted (P<0.01, respectively). However, the abilities of cell migration and endocytosis were not affected compared with untreated cells. These data suggest that: i) the NET-1 gene may play an important role in proliferation, migration and endocytosis of cells; ii) siRNA technology may efficiently suppress the expression and function of NET-1 in HCC, suggesting that NET-1 may be a therapeutic target for HCC.     

mDRA-6与尼美舒利对人肝癌细胞系SMMC-7721细胞的协同杀伤效应

背景与目的:mDRA-6为本实验室制备的具有肿瘤细胞杀伤作用的抗人死亡受体5(death receptor5,DR5)的单克隆抗体,尼美舒利作为特异性环氧合酶-2(cyclooxygenase-2,COX-2)抑制剂,近年来发现其对某些肿瘤细胞系的细胞具有促凋亡作用,本研究探讨mDRA-6与尼美舒利对肝癌细胞系SMMC-7721的杀伤作用,及二者有无协同效应。方法:流式细胞术检测细胞表面DR5的表达率;分别用一定浓度的mDRA-6、尼美舒利、mDRA-6联合200μmol/L尼美舒利处理SMMC-7721细胞,MTT法检测细胞毒性作用,Hoechst33258染色观察SMMC-7721细胞核形态变化,流式细胞术定量分析凋亡细胞率。结果:SMMC-7721细胞表面DR5的表达率为95.0%,mDRA-6能够诱导SMMC-7721细胞凋亡,存在浓度依赖性(r=0.984,P=0.002),25ng/mL作用12h可杀伤10.5%的细胞,1600ng/mL作用12h可杀伤35.0%的细胞。尼美舒利能够诱导SMMC-7721细胞凋亡,200μmol/L作用12h可使5.0%的细胞凋亡,800μmol/L作用12h可杀伤34.0%的细胞,存在浓度依赖性(r=0.929,P=0.002)。尼美舒利与mDRA-6联合对SMMC-7721细胞具有协同杀伤作用(q=1.23),200μmol/L的尼美舒利协同25ng/mL与1600ng/mL的mDRA-6作用12h可分别杀伤31.2%与91.1%的SMMC-7721细胞,Hoechst33258染色和Annexin V/PI染色证实杀伤作用是通过诱导细胞凋亡实现的。结论:mDRA-6与尼美舒利均有杀伤SMMC-7721细胞的作用,二者具有协同作用,该作用是通过诱导凋亡实现的。     

Lentiviral-mediated Smad4 RNAi induced anti-proliferation by p16 up-regulation and apoptosis by caspase 3 down-regulation in hepatoma SMMC-7721 cells

Transforming growth factor-beta (TGF-beta)-Smad signaling pathway participates in the regulation of a variety of cellular activities. Unlike the high incidences of Smad4 mutation or deletion in pancreatic cancer and gastrointestinal cancers, Smad4 gene is seldom mutated or deleted in hepatocellular carcinoma (HCC). The role of TGF-beta-Smad4 signaling pathway in leading to carcinogenesis of liver cells remains unknown. In this study, we succeeded in silencing Smad4 using lentiviral-mediated Smad4 RNA interference (RNAi). We investigated the role of Smad4 in TGF-beta1-induced cell proliferation and apoptosis of HCC cell line SMMC-7721. We determined cell proliferation, apoptosis, and expression of p21, p16, p53 and caspase 3. Results showed that TGF-beta1 not only had a significant anti-proliferation effect but also induced cellular apoptosis in SMMC-7721 cells. These effects induced by TGF-beta1 were almost completely blocked by the knockdown of Smad4. Western blot analysis revealed that p16 was up-regulated and caspase 3 was activated by silencing of Smad4, and the expression of p21 and wild-type p53 were not affected. These results suggest that TGF-beta1-induced cell growth inhibition by up-regulating p16 expression and cellular apoptosis by activating caspase 3 was Smad4-dependent. Additionally, the knock down of a specific gene using lentiviral-mediated RNAi appears to be a promising tool and strategy for analyzing endogenous gene function.     

奥沙利铂和人参皂苷Rg3不同联合方式对人肝癌细胞株SMMC-7721作用的影响

目的 通过体外实验观察奥沙利铂和人参皂苷Rg3不同联合方式对人肝癌细胞株SMMC-7721作用的影响,并初步探讨其机制。方法 采用MTT法观察奥沙利铂、人参皂苷Rg3单药以及两药同时和序贯应用对SMMC-7721细胞增殖的作用;应用流式细胞术分析单药和两药不同序贯方式对细胞周期分布及凋亡的影响;Western blotting检测单药和两药不同序贯方式作用后SMMC-7721细胞cyclin D1蛋白的表达情况。结果 奥沙利铂、人参皂苷Rg3单药、两药同时及序贯给药对SMMC-7721细胞增殖均有明显的抑制作用。同时用药组的增殖抑制作用优于人参皂苷Rg3先用组（P＜0.05）,但与奥沙利铂先用组比较未见明显差异（P＞0.05）;奥沙利铂先用组的效果优于人参皂苷Rg3先用组（P＜0.05）。流式细胞术分析显示,奥沙利铂主要将细胞阻滞在S期、G₂／M期,人参皂苷Rg3主要将细胞阻滞在G₀／G₁期,同时用药组和奥沙利铂先用组的凋亡率相似（P＞0.05）,阻滞细胞于G₂／M期,且凋亡率均较先用人参皂苷Rg3组高（P＜0.05）。Western blotting显示,两药序贯及同时应用组cyclin D1蛋白表达明显低于单药组,奥沙利铂先用组与同时用药组相似,均低于人参皂苷Rg3先用组。结论 奥沙利铂、人参皂苷Rg3序贯及同时应用较单药更能抑制人肝癌SMMC-7721细胞的增殖,先用奥沙利铂后序贯人参皂苷Rg3与两药同时应用的协同增效作用相似,均优于先用人参皂苷Rg3后序贯奥沙利铂,其机制可能与奥沙利铂先用组和同时用药组将细胞阻滞在S期、G₂／M期,增加促凋亡作用,同时下调cyclin D1蛋白的表达水平有关。     

人剪切修复基因XPD转染对人肝癌细胞SMMC-7721的生物学影响

目的 将人剪切修复基因XPD稳定转染人SMMC-7721肝癌细胞,观察转染后细胞内野生型p53、XPD、周期素依赖性蛋白激酶(CDK)7、c-myc等基因表达的变化以及对细胞生长的影响,探讨野生型XPD基因与p53、CDK7、c-myc的相互作用及细胞凋亡机制.方法 将表达绿色荧光蛋白并含有人类全长野生型XPD的pEGFP-N2-XPD重组体质粒稳定转染人SMMC-7721肝癌细胞中,选择培养基筛选单克隆稳定转染重组质粒的人SMMC-7721肝癌细胞(SMMC-7721-pEGFP-N2-XPD)和稳定转染空载质粒的人SMMC-7721肝癌细胞(SMMC.7721-pEGFP-N2),并将人SMMC-7721肝癌细胞作为空白对照,利用荧光显微镜观测绿色荧光蛋白表达,用逆转录-聚合酶链反应(RT-PCR)、Westem blot法检测转染XPD基因后细胞内XPD、p53、CDK7、c-myc的表达量变化,并用细胞增殖力检测(MTT)法及流式细胞仪分别检测细胞增殖及凋亡和细胞周期变化.结果 ①免疫荧光显微镜下,SMMC.7721.pEGFP.N2.XPD和SMMC-7721-pEGFP-N2细胞中观察到绿色荧光蛋白表达,说明pEGFP-N2-XPD重组质粒和pEGFP-N2空载质粒成功转染.②RT-PCR检测:SMMC-7721-pEGFP-N2-XPD中p53 mRNA、XPD mR-NA表达量与SMMC-7721-pEGFP-N2和SMMC-7721相比均明显增高(P<0.01),CDK7 mRNA、c-myc mRNA在SMMC-7721-pEGFP-N2-XPD的表达量比两对照组明显降低(P<0.01),而两对照组各个基因的表达没有明显差异(P>0.05).③Western blot检测:SMMC-7721-pEGFP-N2-XPD细胞的p53、XPD蛋白表达最较两对照组升高(P<0.01),CDK7、c-myc的蛋白相对表达量比两对照组降低(P<0.01),两对照组差异没有统计学意义(P>0.05).④M1Tr检测:SMMC-7721-pEGFP-N2-XPD的细胞增殖力较对照组减弱(P<0.05),两对照组筹异没有统计学意义(P>0.05).⑤流式细胞仪检测:SMMC-7721-pEGFP-N2-XPD细胞进入s期出现障碍,停滞在G1期的细胞增多.结论 将XPD成功稳定转染到人SMMC-7721肝癌细胞中,XPD、p53在转录和蛋白水平的表达明显升高,CDK7、c-myc表达明显降低,野生型XPD基因的过表达可能抑制CDK7、c-myc表达,改变细胞周期,并促进p53抑制肝癌细胞增长,促进细胞凋亡.     

Iso-suillin Isolated from Suillus luteus,Induces G1 Phase Arrest and Apoptosis in Human Hepatoma SMMC-7721 Cells

Iso-suillin, a natural product isolated from Suillus luteus, has been shown to inhibit the growth of somecancer cell lines. However, the molecular mechanisms of action of this compound are poorly understood. Thepurpose of this study was to investigate how iso-suillin inhibits proliferation and induces apoptosis in a humanhepatoma cell line (SMMC-7721). We demonstrated the effects of iso-suillin on cell proliferation and apoptosisin SMMC-7721 cells, with no apparent toxicity in normal human lymphocytes, using colony formation assaysand 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) analysis. Western blotting was usedto examine the expression of G1 phase-regulated and apoptosis-associated protein levels in iso-suillin treatedSMMC-7721 cells. The results indicated that iso-suillin significantly decreased viability, induced G1 phase arrestand triggered apoptosis in SMMC-7721cells. Taken together, these results suggest the potential of iso-suillin asa candidate for liver cancer treatment.     

miR-223-3p 通过靶向RAC1 调控肝细胞癌SMMC-7721 细胞的增殖和凋亡

目的：探讨miR-223-3p 通过调控Ras 相关C3 肉毒素底物1（Ras-related C3 botulinum toxin substrate 1，RAC1）对肝细胞癌（hepatocellular carcinoma，HCC）细胞增殖和凋亡的影响及其可能的作用机制。方法：选用2016 年8 月至2018 年8 月吉林市中心医院手术切除的30 例HCC 组织及其癌旁组织标本和人HCC 细胞系SMMC-7721、Bel-7402、HepG2 及人正常肝细胞QSG-7701，用qPCR检测HCC组织和细胞系中miR-223-3p的表达水平。分别将miR-223-3p mimics、miR-223-3p inhibitor 和siRAC1转染至SMMC-7721 细胞，通过CCK-8、克隆形成实验和Annexin V-FITC/PI 染色流式细胞术检测SMMC-7721 细胞的增殖、克隆形成和凋亡水平。用双荧光素酶报告基因实验检测miR-223-3p 与RAC1 的靶向关系，Western blotting 检测细胞中RAC1 蛋白的表达水平。结果：miR-223-3p 在HCC组织的表达水平显著低于癌旁组织（P<0.01），其表达水平与肿瘤大小、TNM分期及肿瘤分化病理特征相关（P<0.05 或P<0.01）；miR-223-3p 在HCC细胞系表达水平显著低于QSG-7701 细胞（均P<0.01），以在SMMC-7721细胞中表达水平最低。双荧光素酶报告基因实验证实RAC1 是miR-223-3p 靶基因，miR-223-3p 靶向负调控RAC1 的表达。转染miR-223-3p mimics 显著抑制SMMC-7721 细胞的增殖和克隆形成能力（P<0.05 或P<0.01），并促进细胞凋亡（P<0.01）；转染miR-223-3p inhibtor 则逆转miR-223-3p mimics 对细胞的抑制作用。结论：过表达miR-223-3p 抑制HCC细胞增殖和克隆形成能力并促进细胞凋亡，其机制可能与靶向下调RAC1表达有关。