TGF-β1诱导人肝癌细胞HepG2上皮间质转化及对JAK-STAT3信号通路的影响

目的探讨TGF-β1诱导人肝癌细胞HepG2上皮间质转化及对JAK-STAT3表达的影响。方法采用5μg·mL^-1 TGF-β1处理人肝癌细胞HepG2细胞,用倒置显微镜观察细胞形态变化,用Real time-PCR检测E-cadherin和Vimentin的mRNA表达变化;Western blot检测E-cadherin、Vimentin、JAK、p-JAK、STAT3及p-STAT3的蛋白表达变化。结果 TGF-β1可激活JAK-STAT3通路,上调Vimentin表达,同时下调E-cadherin的表达,并显著促进其上皮间质转化。结论 TGF-β1可以诱导人肝癌细胞HepG2上皮间质转化,其机制可能与JAK-STAT3信号通路激活有关。     

裂果薯皂苷单体Ⅰ通过TGF-β1调控上皮间质转化对人肝癌细胞SMMC-7721侵袭和转移的影响

目的探究裂果薯皂苷单体Ⅰ通过转化生长因子-β1(transforming growth factor-β1,TGF-β1)对人肝癌细胞SMMC-7721侵袭和转移的影响。方法MTT法检测SMMC-7721细胞的增殖活性;用TGF-β1刺激细胞24 h,以TGF-β1/Smad信号通路抑制剂SIS3作阴性对照。细胞划痕实验和Tran-swell小室侵袭实验分别检测细胞迁移和侵袭能力;Western blot检测Smad7、Smad2/3、p-Smad2/3、E-cadherin、N-cadherin和Vimentin蛋白表达。结果SSPHⅠ能抑制SMMC-7721细胞的增殖,其24 h的IC50为1.72μmol·L^-1;与TGF-β1组相比,TGF-β1+SSPHⅠ组细胞迁移率和侵袭细胞数显著降低;Western blot实验结果显示,TGF-β1+SSPHⅠ组的Smad2/3,p-Smad2/3,N-cadherin和Vimentin蛋白的表达降低,Smad7和E-cadherin表达升高,结果与TGF-β1+SIS3组相同(P均<0.05)。结论SSPHⅠ能抑制SMMC-7721细胞侵袭和转移,其机制可能与抑制TGF-β1/Smad信号通路,阻断EMT发生有关。     

槲皮素抑制TGF-β1诱导SMMC-7721人肝癌细胞发生EMT的效果研究CSCD

目的旨在研究槲皮素抑制转化生长因子-β1(TGF-β1)诱导SMMC-7721人肝癌细胞发生上皮-间质转化(EMT)的效果。方法将肝癌细胞分为对照组(10 ng/ml TGF-β1)、低剂量组(50 nmol/l槲皮素+10 ng/ml TGF-β1)、高剂量组(10 ng/ml TGF-β1+100 nmol/l槲皮素),分别处理6 h,光学显微镜观察肝癌细胞形态学变化。6、12和24 h后,观察肝癌细胞迁移及侵袭能力。逆转录聚合酶链反应(RT-PCR)测定肝癌细胞E-钙黏蛋白(E-cadherin)、N-钙黏蛋白(N-cadherin)和波形蛋白(Vimentin)mRNA表达。Western blot法测定肝癌细胞E-cadherin、N-cadherin和Vimentin蛋白。结果经TGF-β1诱导后,肝癌细胞发生明显EMT。划痕实验结果显示,12和24 h时,高剂量组和低剂量组肝癌细胞迁移划痕空隙长度明显低于对照组(P<0.05)。侵袭实验中,与对照组比较,低和高剂量组每视野穿膜肝癌细胞数明显降低,且高剂量组穿膜高于低剂量组(P<0.05)。RT-PCR实验结果显示,对照组E-cadherin mRNA表达明显低于高剂量组和低剂量组(P<0.01),N-cadherin和Vimentin mRNA表达明显高于高剂量组和低剂量组(P<0.01)。低剂量E-cadherin mRNA表达明显低于高剂量组(P<0.01),N-cadherin和Vimentin mRNA表达明显高于高剂量组(P<0.01)。Western blot实验结果显示,对照组E-cadherin蛋白表达明显低于高剂量组和低剂量组(P<0.01),N-cadherin、Vimentin蛋白明显高于高剂量组和低剂量组(P<0.01)。高剂量组E-cadherin蛋白表达明显高于低剂量组(P<0.01),N-cadherin和Vimentin蛋白表达明显低于低剂量组(P<0.01)。结论槲皮素通过增加E-cadherin蛋白表达表达,降低N-cadherin、Vimentin蛋白表达,使得TGF-β1诱导的肝癌细胞EMT得到明显抑制。     

AGGF1通过激活Wnt/β-catenin信号通路促进结直肠癌发生发展

目的 研究G补缀FHA域血管新生因子1（angiogenic factor with G-patch and FHA domain 1,AGGF1）调控Wnt/β-catenin信号通路对结直肠癌细胞（colorectal cancer,CRC）增殖、侵袭和上皮间质转化（epithelial mesenchymal transition,EMT）的可能机制。方法 通过裸鼠荷瘤免疫组化法检测AGGF1在正常组织和癌组织中的表达。qRT-PCR和Western blotting检测NCM460、SW620、HT29、HCT116、SW480中AGGF1的mRNA和蛋白表达水平。于HCT116细胞中过表达AGGF1,分为Vector组和AGGF1组;于SW620细胞中敲减AGGF1,分为shControl组和shAGGF1组。CCK-8法和克隆形成试验测定细胞活性和细胞克隆数目。划痕试验和Transwell试验检测细胞迁移和侵袭情况。免疫荧光检测细胞E-cadherin、N-cadherin的表达。Western blotting检测细胞E-cadherin、N-cadherin、AGGF1、β-catenin、糖原合酶激酶-3β （glycogen synthase kinase-3β,GSK-3β）、p-GSK-3β蛋白表达水平。结果 AGGF1蛋白表达在CRC组织中明显增高。AGGF1 mRNA和蛋白表达水平在HCT116细胞中最低,在SW620细胞中最高。CCK-8法、克隆形成试验、划痕试验和Transwell试验结果显示,在HCT116细胞中,与Vector组比较,AGGF1组48,72,96 h细胞活性、克隆细胞数目、相对迁移距离、侵袭细胞数显著增加（P<0.05或P<0.01）;而在SW620细胞中,与shControl组比较,shAGGF1组结果相反（P<0.05或P<0.01）。免疫荧光和Western blotting检测结果显示,与Vector组比较,AGGF1组E-cadherin荧光表达和蛋白表达水平降低（P<0.01）,N-cadherin增强（P<0.05或P<0.01）,同时上调AGGF1、β-catenin、p-GSK-3β/GSK-3β蛋白表达（P<0.01）;与shControl组比较,shAGGF1组E-cadherin荧光表达和蛋白表达水平显著升高（P<0.01）,N-cadherin显著降低（P<0.05或P<0.01）,同时下调AGGF1、β-catenin、p-GSK-3β/GSK-3β蛋白表达（P<0.05或P<0.01）。结论 AGGF1可通过激活Wnt/β-catenin信号通路异常表达,上调β-catenin、p-GSK-3β、N-cadherin表达,下调E-cadherin表达,促进CRC细胞增殖、迁移、侵袭和EMT,从而促进CRC发生发展。     

HMGA1对TGF-β1诱导HTR-8/SVneo细胞上皮间质转化的影响

目的 研究高迁移率蛋白A1(HMGA1)对HTR-8/SVneo细胞中转化生长因子β1(TGF-β1)诱导所致上皮间质转化(EMT)过程中的作用。方法 将HMGA1的小分子干扰RNA(siRNA)转染进人绒毛膜滋养层细胞HTR-8/SVneo,将细胞分为空白对照组、阴性对照+lipofectamine 3000组、lipofectamine 3000组、阳性对照+lipofectamine 3000组、HMGA1 SiRNA-1+lipofectamine 3000组、HMG1 SiRNA-2+lipofectamine 3000组、HMG1 siRNA-3+lipofectamine 3000组,采用实时荧光定量PCR(RT-qPCR)和蛋白免疫印迹法,检测各组的HMGA1基因和蛋白表达,筛选出沉默效率最佳的siRNA;TGF-β1诱导HTR-8/SVneo发生EMT,研究TGF-β1对EMT过程的影响;使用筛选后的siRNA与TGF-β1共同作用,检测HMGA1、N-cadherin、E-cadherin的表达情况;加入TGF-β1用于诱导细胞,探究PI3K/AKT和NF-κB通路...     

亚硝酸钠诱导人肝癌SMMC-7721细胞上皮-间质转化

探讨亚硝酸盐诱导人肝癌SMMC-7721细胞发生上皮-间质转化(EMT)的作用。0.25～25 mmol·L-1亚硝酸钠处理细胞48 h后,酶联免疫吸附实验(ELISA)检测细胞培养上清液中的TGF-β1、IL-6和IL-8水平,相差倒置显微镜下观察细胞形态学变化,划痕实验和Transwell侵袭实验检测细胞移动和侵袭能力,同时采用Western blotting方法检测EMT相关标记蛋白和p-AKT及下游信号分子的蛋白表达水平。结果表明,亚硝酸钠处理人肝癌细胞48 h,可以引起TGF-β1的分泌显著升高,并呈现剂量依赖性。亚硝酸钠对IL-8及IL-6的分泌也具有一定的增加作用,但不具有剂量依赖性。0.25 mmol·L-1亚硝酸钠作用48 h,诱导细胞形态向间质转化,增强波形蛋白和p-AKT及其下游信号蛋白的表达,抑制E型钙黏素蛋白的表达,促进细胞迁移和侵袭能力。结果提示,亚硝酸钠可能通过促进细胞分泌TGF-β1和IL-8,诱导人肝癌SMMC-7721细胞上皮-间质转化。     

Wnt信号通路诱导肿瘤细胞上皮间质转化的研究进展

肿瘤细胞发生上皮间质转化(epithelial-mesenchymaltransition,EMT)从而具有侵袭转移的能力,是肿瘤发展的一个重要过程。既往研究发现Wnt信号通路调节控制着许多生命过程,也发现其是诱导EMT不可缺少的重要通路。通过对Wnt信号分子的调控,可以有效的阻断甚至逆转EMT。Wnt诱导EMT发生发展过程的研究,也为抗肿瘤新药开发提供了新思路,推动了药物的研发。该文旨在对近年Wnt信号通路诱导EMT的研究做一综述。     

小檗碱通过TGF-β/Smad通路抑制TGF-β1诱导的人肝癌HepG2细胞上皮间质转化的研究

目的探讨小檗碱(berberine)对转化生长因子-β1(transforming growth factor-β1,TGF-β1)诱导的人肝癌HepG2细胞上皮间质转化(epithelial-mesenchymal transition,EMT)的作用及其机制。方法MTT法检测小檗碱对HepG2细胞增殖活性;采用10 ng·L-1 TGF-β1诱导HepG2细胞EMT模型形成,并加入小檗碱处理;克隆形成实验、细胞划痕和Transwell小室实验分别检测HepG2细胞的克隆形成能力、迁移和侵袭能力;免疫荧光法检测EMT间质标志物Vimentin的表达;Western blot法检测EMT标志物蛋白(E-cadherin、N-cadherin、Snail)、基质金属蛋白酶(MMP-2)、TGF-β/Smad通路蛋白(Smad2、p-Smad2、Smad3、p-Smad3)的表达。结果小檗碱呈浓度时间依赖性抑制HepG2细胞活性;与TGF-β1组比较,小檗碱可以明显抑制HepG2细胞的克隆形成能力、迁移和侵袭能力;并且小檗碱可以抑制TGF-β1上调的E-cadherin蛋白表达,和TGF-β1下调的N-cadherin、Vimentin、Snail、MMP-2、p-Smad2、p-Smad3蛋白表达。结论小檗碱可能通过抑制TGF-β/Smad信号通路,干预TGF-β1诱导HepG2细胞的EMT进程,抑制HepG2细胞的迁移和侵袭能力。     

TGF-β信号通路调控乳腺癌上皮-间质转化的研究进展

上皮-间质转化(epithelial-mesenchymal transition,EMT)是指具有极性的上皮细胞丧失极性,转化成具有迁移能力的间质细胞的过程。在乳腺癌中,EMT的发生促进原位癌向侵袭性癌发展,并与肿瘤细胞获得耐药性有关。参与调控细胞发生EMT的因素众多,涉及众多信号通路、转录因子及下游相关基因。其中,转化生长因子β(transforming growth factorβ,TGF-β)信号通路在乳腺癌EMT过程中起着重要的作用。本文综述了TGF-β信号通路在调控乳腺癌EMT的研究进展。     

手术治疗前后直肠癌患者血清CEA、HCY、TGF-β1水平变化的临床意义

目的：探讨手术治疗前后直肠癌患者血清中CEA、HCY、TGF-β1水平的变化及临床意义。方法采用放免法（RIA）、酶联法（ELISA）,检测了33例手术治疗前后直肠癌患者血清中CEA、HCY、TGF-β1的水平,和正常人组（35例）的相关指标进行比较。结果术前直肠癌患者血清CEA、HCY、TGF-β1的水平与正常对照组比较,差异有非常显著性（P＜0．01）,术后半年,未复发者（29例）血清CEA、HCY、TGF-β1的水平持续下降,接近正常人,复发者（4例）的相关指标水平再次上升,与术前水平接近,明显的较未复发者高,2组差异有非常显著性（ P＜0．01）。并且血清中CEA的水平与HCY、TGF-β1的水平呈显著正相关（ r＝0．60180．5988,P＜0．01）。结论检测手术治疗前后直肠癌患者血清CEA、HCY、TGF-β1水平变化对了解病情、观察疗效和判断预后具有重要的临床指导意义。     

血清TGF-β1和CTGF水平与急性冠脉综合征的关系

目的:探讨急性冠脉综合征(ACS)患者血清转化生长因子-β1(transforming growth factor-β1,TGF-β1)和结缔组织生长因子(connective tissue growth factor,CTGF)浓度与冠状动脉病变支数和狭窄程度的关系.方法:选择因胸痛入院的患者90例分为ACS 组和正常对照组,入院择日行选择性冠状动脉造影术,以病变支数及Gensini积分评价冠脉病变程度,采用酶联免疫吸附法检测所有患者血清TGF-β1和CTGF水平.结果:ACS组的TGF-β1水平显著低于对照组(P<0.01),ACS组的CTGF水平显著高于对照组(P<0.05);不同冠脉病变支数与TGF-β1水平间差异有统计学意义,3支病变组和2支病变组均低于1支病变组(均P<0.05);不同冠脉病变支数与血清CTGF水平间差异有统计学意义,3支病变组和2支病变组均高于1支病变组(均P<0.05);血清TGF-β1浓度与Gensini评分间呈负相关(r=-0.096,P<0.05),血清CTGF浓度与Gensini评分呈正相关(r=0.139,P<0.05).结论:TGF-β1是ACS的保护因子,能够增加斑块稳定性和抑制斑块狭窄,CTGF与病变程度相关,能够参与冠脉狭窄形成和加重斑块的不稳定性.     

Interferon-α2b and transforming growth factor-β1 treatments on HCC cell lines: Are Wnt/β-catenin pathway and Smads signaling connected in hepatocellular carcinoma?

Wnt/β-catenin pathway is often dysregulated in hepatocellular carcinoma (HCC). Activated β-catenin accumulates in the cytosol and nucleus and forms a nuclear complex with TCF/LEF factors like TCF4. Interferon-α (IFN-α) has recently been recognized to harbor therapeutic potential in prevention and treatment of HCC. Transforming Growth Factor-β1 (TGF-β1) is a mediator of apoptosis, exerting its effects via Smads proteins. One mode of interaction between Wnt/β-catenin and TGF-β1/Smads pathways is the association of Smads with β-catenin/TCF4. In this study we analyzed the effects of IFN-α2b and TGF-β1 treatments on Wnt/β-catenin pathway, Smads proteins levels, β-catenin/TCF4/Smads interaction and proliferation and apoptotic death in HepG2/C3A and Huh7 cell lines. IFN-α2b and TGF-β1 attenuated Wnt/β-catenin signal by decreasing β-catenin and Frizzled7 receptor proteins contents and the interaction of β-catenin with TCF4. Truncated β-catenin form present in C3A cell line also diminished after treatments. Both cytokines declined Smads proteins and their interaction with TCF4. The overall cellular response to cytokines was the decrease in proliferation and increase in apoptotic death. Treatment with Wnt3a, which elevates β-catenin protein levels, also generated the increment of Smads proteins contents when comparing with untreated cells. In conclusion, IFN-α2b and TGF-β1 proved to be effective as modulators of Wnt/β-catenin pathway in HCC cell lines holding both wild-type and truncated β-catenin. Since the inhibition of β-catenin/TCF4/Smads complexes formation may have a critical role in slowing down oncogenesis, IFN-α2b and TGF-β1 could be useful as potential treatments in patients with HCC.     

TGF-β对原代培养肝细胞及肝癌细胞BEL7401生长作用的影响

目的 研究转化生长因子－β（ＴＧＦ－β）对正常大鼠肝细胞和肝肿瘤细胞的影响。方法 分离和培养原代大鼠肝细胞,培养ＢＥＬ４０１肝癌细胞,通过测定细胞ＤＮＡ合成、细胞活性（ＭＴＴ）及碱性磷酸酶活性,研究ＴＧＦ－β对正常大鼠肝细胞和肝肿瘤细胞的影响方式及可能的作用途径。结果 实验发现,ＴＧＦ－β可以刺激ＢＥＬ７４０１肝癌细胞的增生,促进其ＤＮＡ合成,并增强其活性ＳＴＧＦ－β对原代培养肝细胞ＤＮＡ合成无明显影响,对其活性有明显的抑制作用。实验还发现,ＴＧＦ－β明显刺激ＢＥＬ７４０１肝癌细胞中的碱性磷酸酶增高,同时抑制原代培养肝细胞的碱性磷酸酶活性。结论ＴＧＦ－β对正常细胞和肝癌细胞ＢＥＬ７４０１的生长有不同的影响作用,这种结果可能是通过不同的细胞信号传导途径实现的。     

Panax notoginseng saponins promote hair follicle growth in mice via Wnt/β-Catenin signaling pathway

Panax notoginseng saponins (PNS), the active ingredients of the traditional Chinese medicine Panax notoginseng, have strong neuroprotective and anti-platelet aggregation effects. To investigate whether PNS can promote hair follicle growth in C57BL/6J mice, the optimal concentration of PNS was initially determined, followed by clarification of the mechanism underlying their effects. Twenty-five male C57BL/6J mice had the hair on a 2 × 3 cm² area of the dorsal skin shaved and were equally divided into five groups: control group, 5% minoxidil (MXD) group, and three PNS treatment groups [2% (10 mg/kg), 4% (20 mg/kg), and 8% (40 mg/kg) PNS]. They were then intragastrically administered the corresponding drugs for 28 days. The effects of PNS on C57BL/6J mice were analyzed by subjecting their dorsal depilated skin samples to different assessments, including hematoxylin and eosin staining, immunohistochemistry, immunofluorescence, quantitative real-time polymerase chain reaction (qRT-PCR), and Western blotting (WB). The group with 8% PNS exhibited the largest number of hair follicles from 14 days onwards. Compared with the control group, the number of hair follicles increased significantly in the mice treated with 8% PNS and 5% MXD, which significantly increased in a PNS-dose-dependent manner. Immunohistochemistry and immunofluorescence results revealed that treatment with 8% PNS activated the metabolism of hair follicle cells, with them showing higher rates of proliferation and apoptosis than those in the normal group. In qRT-PCR and WB analysis, the expression of β-catenin, Wnt10b, and LEF1 was upregulated in the PNS and MDX groups compared with that in the control group. Examination of the WB bands revealed that the greatest inhibitory effect of Wnt5a occurred in mice in the 8% PNS group. PNS may promote the growth of hair follicles in mice, with 8% PNS demonstrating the strongest effect. The mechanism behind this may be related to the Wnt/β-catenin signaling pathway.     

Aluminum trichloride impairs bone and downregulates Wnt/β-catenin signaling pathway in young growing rats

Aluminum (Al) can accumulate in bone and cause bone diseases. Few studies have investigated molecular mechanism of Al-induced bone diseases. Thus, in this study, rats were orally exposed to 0 (control group) and 0.4 g/L aluminum trichloride (AlCl₃) (treatment group) for 30, 60, 90 or 120 days, respectively. The Al content of femora and serum, bone histological structure, bone mineral density (BMD) of the distal and proximal femoral metaphysis and Wnt/β-catenin signaling pathway (the mRNA expressions of Wnt3a, Fzd2, LRP-5, β-catenin, Tcf4, cyclin D1 and c-Myc, the protein levels of Wnt3a and β-catenin, the activities of Fzd2 and LRP-5) in rat femora were determined on day 30, 60, 90 or 120, respectively. The results showed that the Al contents of femora and serum were increased, the BMD of the distal and proximal femoral metaphysis were decreased, the femora histological structure were disrupted, the mRNA expressions of Wnt3a, Fzd2, LRP-5, β-catenin, Tcf4, cyclin D1 and c-Myc, the protein levels of Wnt3a and β-catenin, the activities of Fzd2 and LRP-5 were all decreased in the treatment group compared with the control group with time prolonged. These results indicated that AlCl₃ impaired femora by inhibiting the Wnt/β-catenin signaling pathway in young growing rats.     

Wnt/β-catenin信号通路与骨髓基质干细胞分化方向的关系研究

本文旨在对Wnt/β-catenin信号途径对骨髓基质干细胞分化方向的调控作用及该途径中存在的能够促进成骨分化的位点进行综述,探讨Wnt/β-catenin信号途径作为治疗骨质疏松作用靶点的应用前景.