白藜芦醇通过调控Wnt/β-catenin信号通路抑制肝癌细胞生长的研究

目的 探讨白藜芦醇(Res)对肝癌细胞Hep3B生长的影响及其与Wnt/β-catenin信号通路的关系.方法 以25、50、100μmol/L的Res分别干预肝癌细胞株Hep3B 24、48、72 h后,用MTT法测定各组细胞增殖抑制率;用25、50、100μmol/L的Res干预Hep3B细胞24 h后,流式细胞术...     

昆布多酚通过调控Wnt/β-catenin信号通路抑制MCF-7乳腺癌细胞增殖侵袭的研究

目的 研究昆布多酚是否通过调控Wnt/β-catenin通路影响人乳腺癌细胞株MCF-7的增殖和凋亡。方法昆布多酚提取物分别配制成高剂量组（100μg/mL）、中剂量组（50μg/mL）、低剂量组（25μg/mL）与MCF-7细胞株共培养48h后,采用MTT法检测昆布多酚对MCF-7增殖抑制率;TUNEL法检测昆布多酚对MCF-7细胞凋亡指数的影响;Transwell侵袭小室实验、划痕实验观察MCF-7侵袭迁移能力;Western blot检测MCF-7细胞中增殖、凋亡相关总蛋白和核蛋白的表达量。结果 MTT结果显示,昆布多酚提取物显著抑制人乳腺癌细胞株MCF-7细胞的增殖（P<0.05）,且呈剂量依赖;TUNEL结果显示,昆布多酚促进MCF-7凋亡,凋亡指数随着昆布多酚提取物剂量的增加而递增（P<0.05）;Transwell侵袭小室实验、划痕实验结果显示昆布多酚显著抑制MCF-7侵袭和迁移（P<0.05）;Western blot结果显示,随着昆布多酚浓度的增加,总蛋白β-catenin表达不受影响（P>0.05）,细胞核中β-catenin表达逐渐减少（P...     

跑台运动对骨质疏松大鼠骨组织Wnt/β-catenin信号通路的影响

目的 研究跑台运动对骨质疏松大鼠骨代谢的影响以及Wnt/β-catenin信号通路在运动影响骨代谢中的调节作用。 方法 选取2月龄SD雌性大鼠32只,按随机数字表法分为假手术安静组（S组）、去卵巢安静组（O组）、假手术运动组（ST组）和去卵巢运动组（OT组）,每组大鼠8只。采用去卵巢手术制造大鼠绝经后骨质疏松模型,O组和OT组均摘除卵巢,S组和ST组大鼠的手术只进行到找到卵巢,但并不摘除卵巢。造模成功后,S组和O组大鼠在饲养笼中自由活动,ST组和OT组大鼠除在饲养笼中自由活动外,每日还进行跑台训练。于ST组和OT组最后1次运动结束24 h后（入组10周后）处死4组大鼠,分别采用双能X线骨密度仪测定大鼠股骨骨密度（BMD）,全自动生化分析仪检测血清钙（Ca）、磷（P）、碱性磷酸酶（ALP）含量,放射免疫法检测血清骨钙素（BGP）活性,三点弯曲试验检测股骨生物力学指标,Western blot测定骨组织Wnt/β-catenin信号通路相关蛋白的表达。 结果 入组10周后,O组大鼠BMD显著低于S组大鼠,ST组大鼠BMD显著高于S组大鼠,OT组大鼠BMD显著高于O组大鼠BMD,组间差异均有统计学意义（P<0.05）;ST组大鼠Wnt/β-catenin信号通路蛋白P-GSK-3β的相对表达量为（0.51±0.06）,显著低于S组的（0.80±0.05）,组间差异有统计学意义（P<0.05）,而ST组大鼠β-catenin和cyclin D1的相对表达量均显著高于S组,组间差异均有统计学意义（P<0.05）;OT组大鼠Wnt/β-catenin信号通路蛋白P-GSK-3β的相对表达量显著低于O组,而β-catenin和cyclin D1的相对表达量则显著高于O组,组间差异均有统计学意义（P<0.05）。 结论 跑台运动可显著改善骨质疏松大鼠的骨代谢,其机制可能与Wnt/β-catenin信号通路的激活相关。     

Wnt／β-catenin信号通路与恶性血液病

Wnt／β-catenin信号通路是Wnt通路中最重要并且研究最为清楚的信号通路,它与许多实体肿瘤的发生、发展密切相关。最近有研究发现,Wnt／β-catenin信号通路也可能参与恶性造血,在许多恶性血液病中异常激活,本文就Wnt／β-catenin信号通路与恶性血液病（多发性骨髓瘤、慢性髓系白血病、慢性淋巴细胞白血病及急性白血病）关系的最新研究进展作一综述,以揭示其在恶性血液病发生中的相关机制,并为恶性血液病的靶向治疗提供新思路。     

京尼平苷调控Wnt/β-cantenin信号通路抑制胃癌转移的机制研究

目的 探讨京尼平苷（GEN）抑制人胃癌SGC-7901细胞转移的作用及其可能机制。方法 培养人胃癌SGC-7901细胞,使用GEN处理细胞,通过CCK8法检测GEN对SGC-7901细胞增殖的影响,运用Transwell实验检测GEN对SGC-7901细胞迁移和侵袭能力的作用,运用Westernblot和q-PCR检测GEN对SGC-7901细胞β-catenin、E-cadherin、Vimentin和Snail蛋白及mRNA表达的作用;运用Wnt通路激活剂（LiCl）和GEN联合处理SGC-7901细胞后,观察对SGC-7901细胞迁移和侵袭能力的影响,对β-catenin、E-cadherin、Vimentin和Snail蛋白及mRNA表达的影响。结果 Transwell实验结果显示,GEN能够抑制SGC-7901细胞的迁移和侵袭能力下降,差异有统计学意义（P<0.05）。Westernblot和q-PCR结果表明,GEN能够促进E-cadherin的表达,抑制β-catenin、Vimentin和Snail的表达,差异有统计学意义（P<0.05）。与GEN组比较,W...     

Wnt/β-catenin信号通路在肝癌耐药中的作用研究

目的 建立肝癌顺铂耐药细胞系,探讨Wnt/β-catenin信号通路在肝癌顺铂耐药中的作用.方法 使用顺铂逐步增加剂量法诱导人肝癌HepG-2细胞,以建立其多药耐药细胞株HepG-2/DDP;MTT细胞毒实验检测顺铂对HepG-2和HepG-2/DDP细胞的生长抑制作用;荧光定量-PCR检测β-catenin 基因的表达;基因转染双链SiRNA干扰β-catenin基因的表达;Western blot实验检测目的蛋白的表达改变.结果 成功建立了人肝癌HepG-2顺铂耐药细胞株;MTT细胞毒实验结果显示顺铂对HepG-2和HepG-2/DDP细胞的IC50值分别为(2.29±0.14) μmol/L和(20.51±0.84)μmol/L(t=95.68,P＜0.01),与HepG-2细胞比较,HepG-2/DDP细胞对顺铂耐药8.96倍.荧光定量PCR结果显示:HepG-2和HepG-2/DDP细胞中β-catenin基因表达的2-△Ct值分别为0.323±0.065和0.674±0.097(P＜0.01),Western blot检测也显示β-catenin蛋白的表达在HepG-2/DDP细胞也显著高于HepG-2细胞.化学合成的靶向SiRNA可以显著下调β-catenin的表达,顺铂对照组、SiRNA靶向干扰组、SiRNA阴性干扰组HepG-2/DDP细胞的IC50值分别为(21.02±1.64)、(6.23±0.68)、(20.44±1.26) μmol/L,对照组和SiRNA靶向干扰组之间差异有统计学意义(P＜0.01).结论 顺铂耐药细胞HepG-2/DDP出现了Wnt/β-catenin信号通路的激活,SiRNA干扰β-catenin基因表达可显著提高顺铂耐药细胞HepG-2/DDP对顺铂的敏感性,为克服肝癌顺铂新靶点的寻找提供了理论依据.     

白鲜碱通过Wnt/β-catenin信号通路抑制前列腺癌骨转移PC-3细胞的作用

目的 探讨白鲜碱对人前列腺癌细胞上皮-间充质转化的抑制作用及其机制.方法 培养人前列腺癌PC-3细胞,用白鲜碱处理PC-3细胞,通过MTS检测白鲜碱的半抑制浓度IC50及对PC-3细胞增殖的时间依赖性.细胞侵袭能力的检测采用Transwell实验;E-cadherin、vimentin、β-catenin和Snail蛋...     

Wnt/β-catenin信号通路在TNF-α诱导的心肌细胞损伤和凋亡中的作用研究

目的 建立心肌细胞炎症损伤模型,探讨Wnt/β-catenin信号通路在心肌细胞损伤和凋亡中的作用。方法 体外培养大鼠心肌细胞H9c2,用含肿瘤坏死因子-α(TNF-α)的细胞培养基诱导心肌细胞,建立炎症心肌细胞损伤模型。实验包括对照组、炎症组、DDK1不同浓度阻断组共5组。各组检测细胞活力和凋亡率,检测相关基因和蛋白表达;检测细胞培养液中LDH和AST及细胞中SOD浓度。结果 TNF-α诱导H9c2心肌细胞β-catenin、TCF7L2和CyclinD1基因和蛋白表达显著上调,细胞增殖受到抑制、细胞损伤和凋亡增加(P<0.05)。而在DDK1阻断Wnt通路后,相对于炎症组,β-catenin、TCF7L2和CyclinD1基因和蛋白表达显著下调,细胞活力上升、细胞损伤减轻、凋亡率降低(P<0.05)。相关性分析显示,β-catenin基因表达与细胞活力呈负相关,与LDH、AST活性呈正相关(P<0.05)。结论 在TNF-α刺激下,心肌细胞Wnt通路被显著激活,抑制Wnt通路基因表达可减轻细胞损伤和凋亡。     

基于Wnt/β-catenin信号通路探究丹参素减轻滋养细胞氧化应激反应的机制

目的 探讨丹参素通过经典Wnt/β-catenin信号通路改善滋养细胞氧化损伤中的作用机制。方法 将人绒毛滋养细胞系HTR-8/SVneo置于缺氧/复氧(hypoxia/reoxygenation, H/R)条件下,通过CCK-8以确定丹参素对细胞活力的影响以及后续实验的最佳处理浓度。设置正常对照组(normal control, NC)、正常培养+丹参素处理组(normal culture condition with danshensu treatment, NC+DS)、缺氧/复氧处理组(H/R condition, HR)和缺氧/复氧+丹参素处理组(H/R condition with danshensu treatment, HR+DS)。检测各组活性氧物质(reactive oxygen species, ROS)的水平差异。Western blot技术检测各组Wnt/β-catenin信号通路蛋白表达水平。结果 根据CCK-8的检测结果,丹参素最佳处理浓度为10μmol·L^-1,处理48 h后可显著恢复细胞活力。HTR-8/SVneo在H/R处理后R...     

DDK1阻断Wnt/β-catenin信号通路抑制百草枯诱导的肺成纤维细胞转分化北大核心CSCD

目的探讨抑制Wnt/β-catenin信号通路对百草枯(paraquat,PQ)诱导的人胚肺成纤维细胞(MRC-5)转分化的影响及相关分子机制。方法将MRC-5细胞分为三组,对照组(Control组):不加药物处理;PQ组:以50μmol/L的PQ刺激MRC-5细胞72 h诱导建立转分化模型;PQ+DKK1组:以50μmol/L的PQ和10 ng/mL的DKK1同时处理细胞72 h。收集细胞,采用细胞免疫荧光和Western Blot分别检测三组细胞转分化标记物α-SMA、Vimentin和Collagen I的表达水平;同时,应用Western Blot、细胞免疫荧光和实时荧光定量PCR(RT-PCR)技术检测转分化过程中Wnt通路相关信号分子β-catenin、Cyclin D1和WISP1的表达变化情况;进一步采用Wnt/β-catenin通路抑制剂Dickkopf-1(DKK1)阻断该信号途径,Western Blot检测β-catenin、Cyclin D1和WISP1表达变化情况,以验证干预效果并分析干扰Wnt/β-catenin信号传递对转分化标记分子α-SMA、Vimentin和Collagen I表达的影响。结果处理72 h后,与对照组细胞相比,PQ组MRC-5细胞α-SMA、Vimentin和Collagen I的表达水平均显著增加(P<0.05);同时,在PQ诱导MRC-5转分化过程中β-catenin、Cyclin D1和WISP1表达水平显著上调(P<0.05);采用DKK1干扰Wnt/β-catenin信号通路能够抑制PQ诱导MRC-5细胞转分化过程中α-SMA、Vimentin和Collagen I的高表达(P<0.05)。结论DKK1能够通过干扰Wnt/β-catenin信号的激活抑制PQ诱导的成纤维细胞转分化,有望进一步抑制PQ中毒引起的肺纤维化的发生。     

角质细胞生长因子及氯化锂诱导毛囊干细胞定向分化中的信号通路

背景：毛囊干细胞的增殖分化受到自身基因及外来信号的共同作用,Wnt/β-catenin信号通路在毛囊毛发发育中起重要作用,但详细机制尚未明确。 目的：探讨在角质细胞生长因子及氯化锂干预下,Wnt/β-catenin信号通路在人毛囊干细胞向毛囊乳突细胞或表皮细胞定向分化中的作用及与其他信号分子的相互关系。 方法：获取毛囊隆突区干细胞进行培养,检测其生长曲线,观察1×10^6 L^-1、1×10^7 L^-1、1×10^8 L^-1和1×10^9 L^-1培养的毛囊干细胞在不同时间点的增殖效应;使用免疫荧光染色法对毛囊干细胞及其分化细胞进行鉴定。分别以0,0.5,1.5,10,25 mmol/L氯化锂及0,10,25,50,100μg/L角质细胞生长因子诱导毛囊干细胞分化,对比各组细胞的增殖效应,探索促毛囊干细胞分化的最佳氯化锂及角质细胞生长因子浓度。使用RT-PCR检测未处理对照组、10 mmol/L氯化锂组和10μg/L角质细胞生长因子组干预后3,5,7,9 d细胞的β-catenin、APC、GSK-3β、Axin和Lef1的mRNA转录水平。 结果与结论：分离培养的毛囊干细胞在体外经多次传代后仍具有很强的增殖能力和多向分化潜能,随氯化锂浓度升高,细胞增殖效应减弱;而随角质细胞生长因子组质量浓度增高细胞增殖能力增强。含有氯化锂的K-SFM条件培养基中毛囊干细胞形态改变明显,各组间有明显差别,氯化锂〉10 mmol/L时分化比例高,β-catenin表达量增高;而含有角质细胞生长因子K-SFM条件培养基中毛囊干细胞向表皮细胞分化,β-catenin变化不明显。提示氯化锂在促毛囊干细胞分化中,激活 Wnt/β-catenin 信号通路,抑制降解复合物重要成分GSK-3β的表达下降,促使β-catenin在细胞浆表达增加并转入核内,增加靶基因转录,促使毛囊干细胞向毛囊细胞方向分化。氯化锂〉10 mmol/L是促毛囊干细胞分化的最佳浓度,但增殖效应减弱。角质细胞生长因子可促进毛囊干细胞向表皮分化,可促进毛囊干细胞增殖和迁移,促进创面再上皮化及创面愈合。氯化锂和角质细胞生长因子促毛囊干细胞定向分化的作用机制可能为激活Wnt/β-catenin信号通路,促使β-catenin表达改变,从而激活Wnt信号通路中Lef介导相关靶基因的转录。     

Proteomic exploration of the Wnt/beta-catenin pathway

The Wnt/beta-catenin pathway, with its substantial role in development and disease processes, has been the subject of intensive studies for more than two decades. The multiplicity of protein components in the pathway, with their complicated interactions, phosphorylations, and subcellular localization events, presents itself as a great system for proteomic analysis. Recent advances in proteomic technologies have enabled protein identification and quantification in complex protein mixtures at a global scale, leading to new insights into the pathway. This review will discuss several of the new proteomic technologies, and how they have been applied to the interrogation of the Wnt/beta-catenin pathway, with particular reference to the application of yeast two-hybrid analysis and mass spectrometry-based approaches.     

Retracted Article: Daphnetin inhibits proliferation and glycolysis in colorectal cancer cells by regulating the PI3K/Akt signaling pathway

Daphnetin (7,8-dihydroxycoumarin), a natural coumarin compound, has shown antitumor and energy metabolism regulatory activities. However, the effects of daphnetin on cell proliferation, migration, and glucose metabolism in colorectal cancer (CRC) cells remains unknown. In this study, the effects of daphnetin on CRC cell proliferation, migration, and glucose metabolism have been examined. The results showed that daphnetin inhibited the proliferation, migration, and invasion of CRC cells, and induced CRC cell apoptosis. Furthermore, daphnetin suppressed intracellular glucose and lactate production, and downregulated the expression of hexokinase 2 (HK2) and glucose transporter 1 (GLUT1) in CRC cells. Furthermore, daphnetin prevented activation of the PI3K/Akt pathway in CRC cells. These findings demonstrated that daphnetin inhibited the proliferation, migration and glucose metabolism in CRC cells by suppressing the PI3K/Akt signaling pathway. Therefore, daphnetin has potential as a novel anticancer agent for CRC treatment.

Daphnetin (7,8-dihydroxycoumarin), a natural coumarin compound, has shown antitumor and energy metabolism regulatory activities.     

Overexpression of JAKMIP1 associates with Wnt/beta-catenin pathway activation and promotes cancer cell proliferation in vitro

JAKMIP1 is a member of the recently characterized JAKMIP1 family of proteins. It has been suggested that JAKMIP1 may play a role in various cell programs, such as cytoskeleton rearrangement, cell polarization, intracellular transport or even cell signaling activities. We examined its protein expression in tumor and followed it with a model that captures its impact on activities of some tumor-linked signaling pathways as well as how its upregulation affects cell proliferation. Here, we demonstrate that JAKMIP1 is highly expressed in tumor samples than in normal tissues. Additionally, higher expression of this protein may activate Wnt signaling activity, potentiate beta-catenin accumulation and enhance proliferation of cancer cells.     

Wnt/β-连环蛋白信号通路在骨关节炎发生过程中的作用

背景：研究表明经典Wnt/β-连环蛋白信号通路与骨关节炎的发生发展有重要联系,Wnt蛋白家族、β-连环蛋白以及相关抑制因子可以调节软骨细胞功能和代谢。目的：综述Wnt/β-连环蛋白信号通路与骨关节炎的关系。方法：通过计算机检索CNKI和Elsevier数据库中2000/2011文献,关键词为＂Wnt/β-catenin,OA,骨关节炎,软骨细胞＂。选择与Wnt/β-连环蛋白信号通路对骨关节炎影响有关的文章内容。结果与结论：目前研究表明经典Wnt/β-连环蛋白信号通路是维持关节完整性,调节关节软骨代谢的重要途径之一,对骨关节炎有重要影响。Wnt信号通路以及下游信号OPG/RANKL/RANK通过调节和控制关节软骨代谢,引发骨关节炎疾病,但具体机制有待进一步研究。研究Wnt通路的组分及其作用,不仅有助于骨关节炎的特定治疗,而且有利于预防骨质疏松及其他关节性疾病。     

姜黄素抑制Hedgehog信号诱导胃癌细胞凋亡

目的探讨姜黄素对胃癌细胞MKN45的作用及可能机制。方法不同浓度的姜黄素作用胃癌细胞MKN45后,采用MTT法检测细胞增殖,流式细胞仪检测细胞凋亡,Westernblot技术检测索尼克刺猬信号(Shh)、脑胶质瘤相关癌基因1(GLI1)的表达水平。结果不同浓度的姜黄素与胃癌细胞MKN45共培养后,随着姜黄素浓度的逐渐增加,MKN45细胞的增殖抑制也逐渐增加,经统计学分析发现,姜黄素5μmol/ml组与对照组比较,姜黄素10μmol/ml组与对照组比较,姜黄素20μmol/ml组与10μmol/ml组、5μmol/ml组、对照组比较,差异均有统计学意义(t分别=16.24、14.57、21.16、25.00、38.20,P均<0.05)。胃癌细胞MKN45经姜黄素处理后,姜黄素20μmol/ml组的细胞凋亡率与10μmol/ml组、5μmol/ml组、对照组比较,差异均有统计学意义(t分别=57.05、59.93、61.98,P均<0.05)。经姜黄素处理的MKN45细胞,Shh和GLI1表达均明显降低,与对照组比较,差异均有统计学意义(t分别=3.76、3.55,P均<0.05)。结论姜黄素能通过抑制Hedgehog信号通路,抑制胃癌细胞的增殖,诱导其凋亡。     

The m6A methyltransferase METTL14 inhibits the proliferation,migration, and invasion of gastric cancer by regulating the PI3K/AKT/mTOR signaling pathway

Background N6‐methyladenosine (m6A) modification may participate in the regulation of occurrence and development of tumors. However, the m6A level and the potential regulatory mechanism of m6A in gastric cancer (GC) remain uncertain.MethodsRNA m6A quantification assay was conducted to detect the m6A level in GC tissues and cell lines. Methyltransferase‐like 14 (METTL14) expression in GC tissues was explored by bioinformatics and immunohistochemistry. Then, the function of METTL14 in GC cells was examined by CCK‐8, colony formation assay, wound healing assay, and Transwell assay. Besides, Western blotting was conducted to probe the PI3K/AKT/mTOR pathway and the epithelial‐mesenchymal transformation (EMT) pathway‐related gene expression.ResultsThe m6A modification level was decreased in GC and METTL14 was a key regulator resulting in m6A disorder in GC. METTL14 was downregulated in GC by analyzing both clinical samples and bioinformatics. METTL14 overexpression suppressed GC cell proliferation and aggression by deactivating the PI3K/AKT/mTOR pathway and the EMT pathway, respectively.ConclusionsOur findings indicate that METTL14 partakes in the biological process of GC as a tumor suppressor and may be an emerging biomarker in GC.     

Targeting the active beta-catenin pathway to treat cancer cells

The adenomatous polyposis coli or beta-catenin genes are frequently mutated in colorectal cancer cells, resulting in oncogenic activation of beta-catenin signaling. We tried to establish in vitro and in vivo models for selectively killing human cancer cells with an activated beta-catenin/T-cell factor (Tcf) pathway. We used a recombinant adenovirus that carries a lethal gene [p53-up-regulated modulator of apoptosis (PUMA)] under the control of a beta-catenin/Tcf-responsive promoter (AdTOP-PUMA) to selectively target human colorectal cancer cells (SW480, HCT116, DLD-1, and LS174T), hepatocellular carcinoma (HepG2), and gastric cancer cells (AGS) in which the beta-catenin/Tcf pathway is activated, and compared its efficiency in killing cancer cells in which this pathway is inactive or only weakly active. AdFOP-PUMA, carrying a mutant Tcf-binding site, was used as control virus. The combined effect of AdTOP-PUMA with several chemotherapeutic agents (5-florouracil, doxorubicin, and paclitaxel) was also evaluated. The effect of AdTOP-PUMA on colorectal cancer cells was also examined in nude mice: SW480 cells were infected with the AdTOP-PUMA and AdFOP-PUMA, and then inoculated s.c. into nude mice. The TOP-PUMA adenovirus inhibited cell growth in a dose-dependent fashion, depending on the signaling activity of beta-catenin. The growth of cells displaying high levels of active beta-catenin/Tcf signaling was inhibited after infection with AdTOP-PUMA, whereas that of cells with low levels of beta-catenin signaling was not. Growth inhibition was associated with induction of apoptosis. Chemotherapy synergistically enhanced the effect of AdTOP-PUMA. A combination of the adenovirus system with standard therapy may improve the efficacy and reduce the toxicity of therapy in humans.     

FAM117B promotes gastric cancer growth and drug resistance by targeting the KEAP1/NRF2 signaling pathway

Gastric cancer often shows malignant growth and insensitivity to chemotherapeutic drugs due to the regulation of complex molecular mechanisms, which results in poor prognosis for patients. However, the relevant molecular mechanisms remain unclear. In this study, we reported that family with sequence similarity 117, member B (FAM117B), promoted the growth of gastric cancer cells and reduced the sensitivity of cells to chemotherapeutic drugs. Mechanistically, FAM117B competed with nuclear factor E2–related factor 2 (NRF2) for Kelch-like ECH-associated protein 1 (KEAP1) binding, reduced the ubiquitination degradation of NRF2, and activated the KEAP1/NRF2 signaling pathway. Moreover, FAM117B-induced growth and chemoresistance of gastric cancer cells were NRF2 dependent. We found that FAM117B and NRF2 protein levels were highly expressed in tumor tissues of patients with gastric cancer and their co-overexpression represented an independent factor for poor prognosis. Collectively, our findings reveal that FAM117B is involved in promoting gastric cancer growth and drug resistance, and it could be exploited as a cancer therapeutic target.