Silencing of peroxiredoxin 2 suppresses proliferation and Wnt/β-catenin pathway,and induces senescence in hepatocellular carcinoma

Hepatocellular carcinoma(HCC),a common malignancy worldwide,still lacks effective clinical treatment.The study aimed to investigate the oncogenes that affect the progression of HCC and their possible mechanisms.In our study,we initially confirmed a higher level of PRDX2 in the bile of HCC patients compared to those with choledocholithiasis by 2-DE,LC-MS,and ELISA.Subsequently,we demonstrated the high expression of peroxiredoxin 2(PRDX2)in HCC based on the TCGA database and clinical sample analysis.Furthermore,PRDX2 overexpression enhanced the viability of HCC cells.And PRDX2 silencing induced senescence of HCC cells.In vivo,knockdown of PRDX2 significantly reduced the weight of xenograft tumors.PRDX2 also was found to activate the Wnt/β-catenin pathway by inducingβ-catenin nuclear translocation.Consequently,we proved that silencing PRDX2 could inhibit proliferation and Wnt/β-catenin pathway while promoting senescence in HCC cells.

Cinobufotalin prevents bone loss induced by ovariectomy in mice through the BMPs/SMAD and Wnt/β-catenin signaling pathways

Background:Osteoporosis is a chronic bone disease characterized by bone loss and decreased bone strength.However,current anti-resorptive drugs carry a risk of various complications.The deep learning-based efficacy prediction system(DLEPS)is a forecasting tool that can effectively compete in drug screening and prediction based on gene expression changes.This study aimed to explore the protective effect and potential mechanisms of cinobufotalin(CB),a traditional Chinese medicine(TCM),on bone loss.Methods:DLEPS was employed for screening anti-osteoporotic agents according to gene profile changes in primary osteoporosis.Micro-CT,histological and morphological analysis were applied for the bone protective detection of CB,and the osteogenic differentiation/function in human bone marrow mesenchymal stem cells(hBMMSCs)were also investigated.The underlying mechanism was verified using qRT-PCR,Western blot(WB),immunofluorescence(IF),etc.Results:A safe concentration(0.25mg/kg in vivo,0.05μM in vitro)of CB could effectively preserve bone mass in estrogen deficiency-induced bone loss and promote osteogenic differentiation/function of hBMMSCs.Both BMPs/SMAD and Wnt/β-catenin signaling pathways participated in CB-induced osteogenic differentiation,further regulating the expression of osteogenesis-associated factors,and ultimately promoting osteogenesis.Conclusion:Our study demonstrated that CB could significantly reverse estrogen deficiency-induced bone loss,further promoting osteogenic differentiation/function of hBMMSCs,with BMPs/SMAD and Wnt/β-catenin signaling pathways involved.

Effects of Helicobacter pylori and Moluodan on the Wnt/β-catenin signaling pathway in mice with precancerous gastric cancer lesions

BACKGROUND Helicobacter pylori(H.pylori)is the primary risk factor for gastric cancer(GC),the Wnt/β-Catenin signaling pathway is closely linked to tumourigenesis.GC has a high mortality rate and treatment cost,and there are no drugs to prevent the progression of gastric precancerous lesions to GC.Therefore,it is necessary to find a novel drug that is inexpensive and preventive to against GC.AIM To explore the effects of H.pylori and Moluodan on the Wnt/β-Catenin signaling pathway and precancerous lesions of GC(PLGC).METHODS Mice were divided into the control,N-methyl-N-nitrosourea(MNU),H.pylori+MNU,and Moluodan groups.We first created an H.pylori infection model in the H.pylori+MNU and Moluodan groups.A PLGC model was created in the remaining three groups except for the control group.Moluodan was fed to mice in the Moloudan group ad libitum.The general condition of mice were observed during the whole experiment period.Gastric tissues of mice were grossly and microscopically examined.Through quantitative real-time PCR(qRT-PCR)and Western blotting analysis,the expression of relevant genes were detected.RESULTS Mice in the H.pylori+MNU group showed the worst performance in general condition,gastric tissue visual and microscopic observation,followed by the MNU group,Moluodan group and the control group.QRT-PCR and Western blotting analysis were used to detect the expression of relevant genes,the results showed that the H.pylori+MNU group had the highest expression,followed by the MNU group,Moluodan group and the control group.CONCLUSION H.pylori can activate the Wnt/β-catenin signaling pathway,thereby facilitating the development and progression of PLGC.Moluodan suppressed the activation of the Wnt/β-catenin signaling pathway,thereby decreasing the progression of PLGC.

Pachymic acid exerts antitumor activities by modulating the Wnt/β-catenin signaling pathway via targeting PTP1B

Objective:To determine the inhibitory effects of pachymic acid on lung adenocarcinoma(LUAD)cells and elucidate its underlying mechanism.Methods:CCK-8,wound healing,Transwell,Western blot,tube formation,and immunofluorescence assays were carried out to measure the effects of various concentrations of pachymic acid on LUAD cell proliferation,metastasis,angiogenesis as well as autophagy.Subsequently,molecular docking technology was used to detect the potential targeted binding association between pachymic acid and protein tyrosine phosphatase 1B(PTP1B).Moreover,PTP1B was overexpressed in A549 cells to detect the specific mechanisms of pachymic acid.Results:Pachymic acid suppressed LUAD cell viability,metastasis as well as angiogenesis while inducing cell autophagy.It also targeted PTP1B and lowered PTP1B expression.However,PTP1B overexpression reversed the effects of pachymic acid on metastasis,angiogenesis,and autophagy as well as the expression of Wnt3a andβ-catenin in LUAD cells.Conclusions:Pachymic acid inhibits metastasis and angiogenesis,and promotes autophagy in LUAD cells by modulating the Wnt/β-catenin signaling pathway via targeting PTP1B.

MicroRNA-329-3p inhibits the Wnt/β-catenin pathway and proliferation of osteosarcoma cells by targeting transcription factor 7-like 1

An important factor in the emergence and progre sion of osteosarcoma(OS)is the dysregulated expression of microRNAs(miRNAs).Transcription factor 7-like 1(TCF7LI),a member of the T cell factor/lymphoid enhancer factor(TCF/LEF)transcription factor family,interacts with the Wnt signaling pathway regulator β-catenin and acts as a DNA-specific binding protein.This study sought to elucidate the impact of the interaction between miR 3293p and TCF7L1 on.the growth and apoptosis of OS and analyze the regulatory expression relationship between miRNA and mRNA in osteosarcoma cells using a variety of approaches.MiR329-3p was significantly downregulated,while TCF7L1 was considerably up-regulated in all examined OS cell lines.Additionally,a clinical comparison study was performed using the TCGA database.Subsequently,the regulatory relationship between miR-329-3p and TCF7L1 on the proliferation and apoptosis of OS cells was verified through in vitro and in vivo experiments.When miR 329-3p was transfected into the OS cell line,the expression of TCF7L1 decreased,the proliferation of OS cells was inhibited,the cytoskeleton disintegrated,and the nucleus condensed to fom apoptotic bodies.The expression of proteins that indicate apoptosis increased simultaneously.The cell cycle was arrested in the G0/G1 phase,and the G1/S transition was blocked.The introduction of miR 3293p also inhibited downstream Cyclin D1 of the Wnt pathway.Xenograf experiments indicated that the overexpression of miR-329-3p signi ficanly inhibited the growth of OS xenografts in nude mice,and the expression of TCF7L1 and C-Myc in tumor tssues decreased.MiR 329-3p was significantly reduced in OS cells and played a suppressive role in tumorigenesis and proliferation by targeting TCF7L1 both in vitro and in vivo.Osteosarcoma cell cycle arrest and pathway inhibition were observed upon the regulation of TCF7LI by miR 3293p.Summarizing these results,it can be inferred that miR.3293p exerts anticancer efects in osteosarcoma by inhibiting TCF7L1.

Complement factor Ⅰ knockdown inhibits colon cancer development by affecting Wnt/β-catenin/c-Myc signaling pathway and glycolysis

BACKGROUND Colon cancer(CC)occurrence and progression are considerably influenced by the tumor microenvironment.However,the exact underlying regulatory mechanisms remain unclear.AIM To investigate immune infiltration-related differentially expressed genes(DEGs)in CC and specifically explored the role and potential molecular mechanisms of complement factor I(CFI).METHODS Immune infiltration-associated DEGs were screened for CC using bioinformatics.Quantitative reverse transcription polymerase chain reaction was used to examine hub DEGs expression in the CC cell lines.Stable CFI-knockdown HT29 and HCT116 cell lines were constructed,and the diverse roles of CFI in vitro were assessed using CCK-8,5-ethynyl-2’-deoxyuridine,wound healing,and transwell assays.Hematoxylin and eosin staining and immunohistochemistry staining were employed to evaluate the influence of CFI on the tumorigenesis of CC xenograft models constructed using BALB/c male nude mice.Key proteins associated with glycolysis and the Wnt pathway were measured using western blotting.RESULTS Six key immune infiltration-related DEGs were screened,among which the expression of CFI,complement factor B,lymphoid enhancer binding factor 1,and SRY-related high-mobility-group box 4 was upregulated,whereas that of fatty acid-binding protein 1,and bone morphogenic protein-2 was downregulated.Furthermore,CFI could be used as a diagnostic biomarker for CC.Functionally,CFI silencing inhibited CC cell proliferation,migration,invasion,and tumor growth.Mechanistically,CFI knockdown downregulated the expression of key glycolysis-related proteins(glucose transporter type 1,hexokinase 2,lactate dehydrogenase A,and pyruvate kinase M2)and the Wnt pathway-related proteins(β-catenin and c-Myc).Further investigation indicated that CFI knockdown inhibited glycolysis in CC by blocking the Wnt/β-catenin/c-Myc pathway.CONCLUSION The findings of the present study demonstrate that CFI plays a crucial role in CC development by influencing glycolysis and the Wnt/β-catenin/c-Myc pathway,indicating that it could serve as a promising target for therapeutic intervention in CC.

Activation of the wnt/β-catenin/CYP1B1 pathway alleviates oxidative stress and protects the blood-brain barrier under cerebral ischemia/reperfusion conditions

Accumulating evidence suggests that oxidative stress and the Wnt/β-catenin pathway participate in stroke-induced disruption of the blood-brain barrier.However,the potential links between them following ischemic stroke remain largely unknown.The present study found that cerebral ischemia leads to oxidative stress and repression of the Wnt/β-catenin pathway.Meanwhile,Wnt/β-catenin pathway activation by the pharmacological inhibito r,TWS119,relieved oxidative stress,increased the levels of cytochrome P4501B1(CYP1B1)and tight junction-associated proteins(zonula occludens-1[ZO-1],occludin and claudin-5),as well as brain microvascular density in cerebral ischemia rats.Moreove r,rat brain microvascular endothelial cells that underwent oxygen glucose deprivation/reoxygenation displayed intense oxidative stress,suppression of the Wnt/β-catenin pathway,aggravated cell apoptosis,downregulated CYP1B1and tight junction protein levels,and inhibited cell prolife ration and migration.Overexpression ofβ-catenin or knockdown ofβ-catenin and CYP1B1 genes in rat brain mic rovascular endothelial cells at least partly ameliorated or exacerbated these effects,respectively.In addition,small interfering RNA-mediatedβ-catenin silencing decreased CYP1B1 expression,whereas CYP1B1 knoc kdown did not change the levels of glycogen synthase kinase 3β,Wnt-3a,andβ-catenin proteins in rat brain microvascular endothelial cells after oxygen glucose deprivatio n/reoxygenation.Thus,the data suggest that CYP1B1 can be regulated by Wnt/β-catenin signaling,and activation of the Wnt/β-catenin/CYP1B1 pathway contributes to alleviation of oxidative stress,increased tight junction levels,and protection of the blood-brain barrier against ischemia/hypoxia-induced injury.

下调METTL5通过Wnt/β-catenin信号通路抑制三阴乳腺癌细胞增殖、迁移与侵袭

目的探讨甲基转移酶5(methyltransferase-like 5,METTL5)在三阴乳腺癌(triple-negative breast cancer,TNBC)中的作用和潜在机制。方法采用免疫组织化学方法和Western blot检测TNBC肿瘤组织和细胞系中METTL5的表达情况。用靶向METTL5的shRNA(shRNA-METTL5)转染TNBC细胞后,用CCK-8、集落形成、伤口愈合以及Transwell实验分别检测细胞增殖活性、迁移与侵袭,Western blot检测Wnt/β-catenin信号关键蛋白的表达。构建异种移植瘤模型,验证敲降METTL5对TNBC细胞在体内生长以及Wnt/β-catenin信号活性的影响。结果METTL5在TNBC肿瘤组织和细胞系中表达上调(P<0.01)。敲降METTL5可抑制TNBC细胞的增殖、迁移和侵袭并降低了Wnt/β-catenin信号分子β-catenin、细胞周期蛋白(Cyclin)D1、基质金属蛋白酶(MMP)-2和MMP-7的表达(均P<0.01)。体内实验显示,敲降METTL5减缓了移植瘤生长和Wnt/β-catenin信号活性。结论敲降METTL5能抑制TNBC细胞的增殖、迁移与侵袭,其作用可能与抑制Wnt/β-catenin信号通路有关。

低氧微环境通过TGFBI调控Wnt/β-catenin通路介导胰腺癌化疗耐药及机制研究

目的:研究低氧微环境通过TGFBI调控胰腺癌耐药的作用及分子机制。方法:以CCK-8方法检测细胞增殖;以Western blotting技术检测蛋白表达水平;以ImageJ软件分析蛋白灰度值;RNAi技术用于敲减TGFBI基因。结果:TGFBI在Panc-1细胞中表达比正常细胞增强;低氧促进胰腺癌细胞Panc-1增殖并减弱顺铂对Panc-1的抑制作用,而高氧抑制Panc-1细胞增殖并加强顺铂的杀伤作用;低氧促进TGFBI表达及EMT行为;低氧通过TGFBI调控Panc-1细胞增殖及顺铂的杀伤作用;低氧通过TGFBI调控Wnt/β-catenin信号,进而促进EMT行为。结论:低氧微环境通过增强TGFBI表达促进胰腺癌细胞增殖及耐药;低氧微环境通过TGFBI激活Wnt/β-catenin信号通路,促进EMT标志分子表达。

姜黄素对葡萄膜黑色素瘤细胞恶性生物学行为及Wnt/β-catenin通路的抑制作用

目的探究姜黄素对葡萄膜黑色素瘤(UM)恶性生物学行为的抑制作用及机制。方法应用含不同浓度(0、20、40和80μmol/L)姜黄素培养液培养M23细胞48 h,于倒置显微镜下观察细胞形态学改变;采用细胞计数试剂盒8(CCK-8)法检测细胞存活率;分别采用平板克隆形成实验、流式细胞术、细胞划痕实验及Transwell实验检测M23细胞集落形成、凋亡、迁移及侵袭情况;采用实时荧光定量PCR法检测细胞中Wnt/β-catenin通路相关基因c-Myc、细胞周期蛋白D1(Cyclin D1)、Survivin及基质金属蛋白酶9(MMP-9)mRNA相对表达情况;采用Western blot法检测Wnt/β-catenin通路相关蛋白c-Myc、Cyclin D1、Survivin、MMP-9、β-连环蛋白(β-catenin)、糖原合成酶激酶3β(GSK-3β)、磷酸化GSK-3β(p-GSK-3β)及轴抑制蛋白2(Axin2)蛋白相对表达量。另取20只6周龄雌性BALB/c小鼠,左后腹皮下脂肪垫注射M23细胞悬浮液建立小鼠M23体内移植肿瘤模型,将造模成功小鼠按照随机数字表法随机平均分为模型组、姜黄素低剂量组、姜黄素中剂量组和姜黄素高剂量组,每组5只,分别腹腔内注射0、10、20和40 mg/kg姜黄素生理盐水溶液,连续注射30 d后剥离皮下瘤体并称质量。结果0μmol/L姜黄素组、20μmol/L姜黄素组、40μmol/L姜黄素组和80μmol/L姜黄素组细胞存活率分别为(100.00±0.00)%、(83.78±4.59)%、(66.09±3.92)%和(47.16±3.63)%,细胞集落形成数分别为128.67±9.18、100.33±8.73、58.67±6.55和31.67±4.92,细胞凋亡率分别为(1.33±0.29)%、(14.53±2.04)%、(27.23±3.56)%和(44.73±4.36)%,细胞迁移率分别为(89.76±4.57)%、(65.43±3.70)%、(34.83±2.19)%和(18.82±1.99)%,细胞侵袭数分别为148.33±8.18、125.33±7.41、73.67±6.34、45.67±5.31,各组M23细胞存活率、集落形成数、细胞凋亡率、细胞迁移率、细胞侵袭数总体比较差异均有统计学意义(F=125.321、97.941、72.516、277.097、139.006,均P<0.001)。随姜黄素作用浓度的增大,细胞存活率、集落形成数、细胞迁移率、细胞侵袭数均明显降低,细胞凋亡率均明显增加,组间两两比较差异均有统计学意义(均P<0.05)。随姜黄素浓度的增大,细胞中c-Myc、Cyclin D1、Survivin和MMP-9 mRNA和蛋白及β-catenin和p-GSK-3β蛋白相对表达水平均明显降低,Axin2蛋白相对表达水平明显升高,组间比较差异均有统计学意义(均P<0.05)。小鼠荷瘤质量随姜黄素作用剂量的增加而降低,组间比较差异均有统计学意义(均P<0.05)。结论姜黄素可抑制UM细胞M23增生、迁移、侵袭等恶性生物学行为,抑制肿瘤生长,促进细胞凋亡,其作用机制可能与阻断Wnt/β-catenin通路激活有关。

基于Wnt/β-Catenin信号通路探讨吴门骨密葆方含药血清促进间充质干细胞成骨分化的效应机制

目的基于Wnt/β-连环蛋白(β-Catenin)信号通路研究吴门骨密葆方含药血清促进骨髓间充质干细胞成骨分化机制。方法将大鼠骨髓间充质干细胞为正常血清组、经典诱导剂[间充质干细胞成骨诱导分化培养基(OBM)]组、吴门骨密葆方含药血清低(10 g生药/kg)和高剂量(20 g生药/kg)组、抑制剂[分泌型蛋白Dickkopf-1(DKK-1),0.1 ng·mL-1]组以及吴门骨密葆方含药血清低、高剂量+抑制剂组,成骨诱导分化后干预7 d时采用CCK8法检测细胞活力,随后采用碱性磷酸酶(alkaline phosphatase,ALP)染色法和ALP试剂盒检测不同剂量吴门骨密葆方含药血清及加入Wnt/β-Catenin信号通路特异性阻滞剂DKK-1干预的间充质干细胞ALP染色强度和活性,Western Blot测定间充质干细胞Wnt信号蛋白家族3alpha(Wnt3a)、β-Catenin、糖原合成酶激酶3β(glycogen synthase kinase 3β,GSK-3β)、破骨细胞抑制因子(osteoprotegerin,OPG)和核因子κB受体活化因子配体(receptor activator of NF-κB ligand,RANKL)蛋白表达水平。结果与正常组比较,吴门骨密葆方含药血清干预均可有效促进间充质干细胞增殖(P均<0.05),吴门骨密葆方含药血清可有效促进间充质干细胞ALP染色的强度和活性(P均<0.05),以及调控成骨分化相关的Wnt3a、β-Catenin、GSK3β、OPG和RANKL蛋白表达(P均<0.05),但是这些调控作用均可被DKK-1在一定程度上逆转。结论吴门骨密葆方含药血清诱导骨髓间充质干细胞的成骨分化,可能通过激活Wnt/β-catenin信号通路以及影响OPG/RANKL通路而实现。

山仙颗粒对Hepa1-6肝癌细胞迁移与侵袭及Wnt/β-catenin信号通路的影响

目的观察山仙颗粒含药血清对Hepa1-6肝癌细胞迁移、侵袭能力的影响,并基于上皮-间充质转化(EMT)和Wnt/β-catenin信号通路探讨其可能的分子机制。方法采用SD大鼠制备山仙颗粒低、中、高剂量含药血清和空白血清。体外培养Hepa1-6肝癌细胞,设空白血清组、KYA1797K组及山仙颗粒低、中、高剂量含药血清组。取各组干预12 h、24 h、36 h后的Hepa1-6肝癌细胞,通过划痕实验检测细胞迁移能力,Transwell实验检测细胞侵袭能力,Western blot法检测细胞中E-钙黏蛋白(E-cadherin)、N-钙黏蛋白(N-cadherin)、波形蛋白(Vimentin)、β-catenin和磷酸化糖原合成酶激酶3β(p-GSK3β)蛋白表达情况。结果与空白血清组比较,山仙颗粒中、高含药血清组及KYA1797K组干预12 h后的细胞迁移距离和山仙颗粒各组及KYA1797K组干预24 h、36 h后的细胞迁移距离均明显缩短(P均<0.05);山仙颗粒各组及KYA1797K组干预12 h、24 h、36 h后的穿膜细胞数量均明显减少(P均<0.05),细胞中E-cadherin蛋白相对表达量均明显升高(P均<0.05),细胞中N-cadherin、Vimentin、β-catenin、p-GSK3β蛋白相对表达量均明显降低(P均<0.05)。山仙颗粒低、中、高剂量含药血清组各时间点的细胞迁移距离呈剂量依赖性缩短,穿膜细胞数量呈剂量依赖性减少,细胞中E-cadherin、N-cadherin和Vimentin蛋白相对表达量呈剂量依赖性升高或降低,组间两两比较差异均有统计学意义(P均<0.05)。结论山仙颗粒可以剂量依赖性地抑制Hepa1-6肝癌细胞的迁移和侵袭,其机制可能与调控Wnt/β-catenin通路,上调E-cadherin和下调N-cadherin、Vimentin的表达,从而抑制细胞EMT进程有关。

布托啡诺调节Wnt/β-catenin信号通路对肺癌细胞增殖迁移和血管生成的影响

目的:探讨布托啡诺调节Wnt/β-catenin信号通路对肺癌细胞增殖、迁移和血管生成的影响。方法:将肺癌H1299细胞分为对照组、布托啡诺低、高剂量组、布托啡诺高剂量+LiCl(Wnt/β-catenin信号通路激活剂)组、FH535组(Wnt/β-catenin信号通路抑制剂)。克隆形成实验检测细胞克隆能力;Transwell实验检测细胞迁移和侵袭;流式细胞术检测细胞凋亡率;血管拟态形成实验观察血管生成情况;western blot检测VEGF-A、VE-cadherin、Bcl-2、Bax、MMP-9、β-catenin、c-Myc和cyclin D1蛋白表达。结果:对照组H1299细胞管腔结构完整;与对照组相比,布托啡诺低、高剂量组和FH535组H1299细胞克隆形成率、细胞迁移和侵袭个数、管腔数量及VEGF-A、VE-cadherin、Bcl-2、MMP-9、β-catenin、c-Myc和cyclin D1蛋白表达降低,细胞凋亡率和Bax蛋白表达升高(P<0.05);LiCl可部分逆转布托啡诺对H1299细胞恶性生物学行为的抑制(P<0.05);FH535组H1299细胞各项检测指标与布托啡诺高剂量组处于同一水平(P<0.05)。结论:布托啡诺能够诱导肺癌细胞凋亡,阻滞迁移、增殖和血管生长,进而阻止肺癌的发生发展,其机制与阻断Wnt/β-catenin信号通路激活相关。

miR-16-5p调控Wnt/β-catenin通路活性在力学载荷促进骨形成中作用的小鼠在体研究

目的 探究LRP6是否为miR-16-5p靶基因及miR-16-5p调控Wnt/β-catenin通路活性在力学载荷促进小鼠骨形成中的作用。方法 利用microRNA信息库预测miR-16-5p的靶基因,行荧光素酶报告实验来验证LRP6是否为miR-16-5p的靶基因。构建跑台组和对照组小鼠验证不同力学环境下骨组织中miR-16-5p及LRP6是否差异表达。制造miR-16-5p差异表达及力学加载动物模型:正常+miRNA Agomir control组(A组)、正常+miR-16-5p Agomir组(B组)、跑台+miRNA Agomir Control组(C组)及跑台+miR-16-5p Agomir组(D组)。干预完成后处死小鼠获取骨组织,检测各组LRP6、β-catenin及Runx2 mRNA及蛋白表达变化,行股骨远端Micro-CT扫描及股骨干生物力学测试检测骨量及力学性能变化。结果 microRNA信息库显示LRP6为miR-16-5p的可能靶基因,荧光素酶报告实验验证LRP6是miR-16-5p的靶基因。与对照组相比,跑台组小鼠骨组织中miR-16-5p表达明显降低,LRP6 mRNA表达明显升高。与A组相比,B组骨组织中LRP6、β-catenin及Runx2表达减低,骨体积分数、骨小梁厚度及生物力学性能减低。与A组相比,C组显著提高了骨组织中LRP6、β-catenin及Runx2的表达,骨体积分数、骨小梁厚度及生物力学性能均提高。与C组相比,D组结果显示LRP6、β-catenin及Runx2表达水平、骨量及生物力学性能均降低。结论 miR-16-5p能够通过靶向下调Wnt/β-catenin通路共受体中LRP6蛋白的表达而降低Wnt/β-catenin通路活性,降低小鼠骨量及骨生物力学性能,而力学载荷能够降低小鼠骨组织中miR-16-5p水平而提高LRP6蛋白表达及成骨活性和骨量。

番泻苷B通过Wnt/β-catenin通路抑制视网膜母细胞瘤HXO-Rb44细胞增殖、凋亡和侵袭

目的探究番泻苷B对视网膜母细胞瘤HXO-Rb44细胞增殖、凋亡、侵袭及Wnt/β-catenin信号通路的影响。方法通过采用不同剂量(0、5、10、20μmol/L)番泻苷B处理HXO-Rb44细胞,将细胞随机分为4组:Control组,番泻苷B 5、10、20μmol/L组。MTT法检测细胞活力;克隆形成实验检测克隆形成率;流式细胞仪检测细胞凋亡率;Transwell检测侵袭细胞数;细胞成球实验检测细胞成球直径和细胞成球数目;蛋白质印迹检测cleaved caspase-3、caspase-3、MMP-2、MMP-9、SOX2、OCT4、CD44、Wnt1、β-catenin蛋白表达。结果与Control组比较,番泻苷B 10、20μmol/L组细胞活力、克隆形成率显著降低(P<0.05),细胞凋亡率和cleaved caspase-3/caspase-3表达显著升高(P<0.05),侵袭细胞数和MMP-2、MMP-9蛋白表达显著降低(P<0.05),细胞成球直径、细胞成球数目和SOX2、OCT4、CD44蛋白表达显著降低(P<0.05),Wnt1、β-catenin蛋白表达显著降低(P<0.05)。结论番泻苷B可抑制视网膜母细胞瘤HXO-Rb44细胞增殖、侵袭和干细胞样特性,诱导细胞凋亡,抑制Wnt/β-catenin信号通路的活化。

基于Wnt/β-catenin信号通路治疗阿尔茨海默病的中医药研究进展

阿尔茨海默病(AD)是导致痴呆最主要的原因,其病理机制较复杂,治疗难度大,是全球范围内重大公共健康问题。发病机制复杂,迄今尚未完全阐明其发病机制,目前认为其主要病理特征包括细胞凋亡、氧化应激、神经炎症、自噬功能障碍、线粒体功能障碍、tau蛋白过度磷酸化和淀粉样蛋白斑块沉积等,临床表现为记忆力减退、认知障碍以及人格改变等,给患者本身、家庭、社会造成严重影响。目前临床上西药常用乙酰胆碱酯酶抑制剂治疗AD,但存在临床疗效欠佳、价高高昂等诸多缺点。研究显示,中医药治疗AD具有临床疗效显著、不良反应少、价格低廉等诸多优势,越来越多的研究者使用中医药治疗AD,取得一定进展。Wnt/β-连环蛋白(β-catenin)信号通路属于保守信号通路,对生命发生发展起重要作用。研究证明,Wnt/β-catenin信号通路对治疗AD有重要作用。通过大量查阅文献,对Wnt/β-catenin信号通路概况及其在AD中的作用,中药单体及单味中药提取物和中药复方通过减少Aβ沉积、神经元损伤及神经毒性等方式来治疗AD的研究现状进行综述,以期为中医药治疗AD提供新的方法和思路。

基于Wnt/β-catenin信号通路探讨雷公藤甲素联合脉冲射频对大鼠神经性疼痛模型抗炎镇痛的作用机制

目的 探讨雷公藤甲素联合脉冲射频对大鼠神经性疼痛模型的抗炎镇痛作用及相关机制。方法 将SD大鼠随机分为假手术组、脊神经结扎组、雷公藤甲素组、脉冲射频组、雷公藤甲素联合脉冲射频组。构建脊神经结扎模型大鼠,检测大鼠疼痛行为学变化;蛋白质印迹法检测坐骨神经组织中Wnt-3α、β-catenin、frizzled7蛋白表达;聚合酶链式反应检测坐骨神经组织中Il-1β、Cox-2、Tnf-α、p65 Nf-κB mRNA表达;免疫组织化学检测坐骨神经组织中SP和C-fos蛋白表达。结果 除假手术组外,其余各组机械性缩足反射阈值在术后第1天急剧下降,术后第5天脊神经结扎组的机械性缩足反射阈值趋于稳定,各治疗组的机械性缩足反射阈值逐渐上升。除假手术组外,其余各组热缩足反射潜伏期在术后前3天急剧下降,术后第3天各组热缩足反射潜伏期开始升高,各治疗组的升高速度均高于脊神经结扎组。蛋白质印迹法结果显示术后第3、7、14天,脊神经结扎组Wnt-3α、β-catenin、frizzled7蛋白表达升高。与脊神经结扎组比,术后第3天各治疗组Wnt-3α、β-catenin、frizzled7蛋白表达差异较小,术后第7天和第14天各治疗组蛋白表达均降低,且雷公藤甲素联合脉冲射频组的相对表达量最低。聚合酶链式反应结果显示术后第3、7、14天,与假手术组比,脊神经结扎组的Il-1β、Cox-2、Tnf-α、p65 Nf-κB mRNA表达升高。与脊神经结扎组比,术后第7天和第14天各治疗组的mRNA表达均降低,且雷公藤甲素联合脉冲射频组表达最低。免疫组织化学结果显示脊神经结扎组中SP和C-fos蛋白表达高于假手术组,且随着时间的延长两种蛋白表达逐渐升高。与脊神经结扎组比,各治疗组SP、C-fos蛋白表达水平随治疗时间的延长均降低,且雷公藤甲素联合脉冲射频组降低最明显。结论 雷公藤甲素联合脉冲射频治疗通过调控Wnt/β-catenin信号通路减轻大鼠神经性疼痛模型炎症和疼痛反应。

Wnt/β-catenin信号通路在肺纤维化中的作用及中医药调控研究进展

肺纤维化(Pulmonary fibrosis,PF)是一种致命且不可逆的呼吸系统疾病,在间质性肺疾病终末期过度表现,以肺泡上皮细胞损伤及异常修复、成纤维细胞增殖、细胞外基质过度沉积等为病理特征,对人类健康造成严重危害,已成为威胁世界范围的公共卫生问题。Wnt/β-连环蛋白(Wnt/β-catenin)信号通路是PF经典通路之一,能够直接或间接参与细胞增殖、炎症细胞浸润、肺组织血管新生及上皮间质转化(EMT)等。中医药在防治PF方面已取得不错的效果,其中有不少中药复方及单体或有效成分通过靶向调节Wnt/β-catenin信号通路作用于PF,文章对近年来中医药调控Wnt/β-catenin信号通路治疗PF相关研究成果进行综述,以期为中医药临床应用提供合理选择。

跑台运动对老年大鼠骨质疏松及wnt/β-catenin信号通路的影响

背景:运动训练有改善骨质疏松的作用,但其对于老年骨质疏松的作用及机制尚未完全明确。目的:观察跑台运动对老年大鼠骨质疏松及wnt/β-catenin信号通路的影响。方法:取16只24月龄雄性SD大鼠,采用随机抽样法分为骨质疏松症组和跑台组,每组8只,以自然衰老复制老年骨质疏松模型,同时跑台组大鼠进行跑台运动干预8周,1次/d,5 d/周;将8只6月龄雄性SD大鼠作为青年组。8周后,采用ELISA法检测各组大鼠血清中骨代谢标志物Ⅰ型胶原交联C末端肽、抗酒石酸酸性磷酸酶、骨钙素、骨特异性碱性磷酸酶水平,双能X射线检测左股骨与L5骨密度,使用骨显微CT行胫骨和L_(4)椎体扫描及骨微结构定量分析,RT-PCR和Western blot检测骨髓中wnt3a、β-catenin、LRP5、DKK1、GSK3β的mRNA和蛋白表达。结果与结论:①与青年组相比,骨质疏松症组大鼠血清骨特异性碱性磷酸酶及骨钙素水平降低(P<0.05),左股骨和L5椎体骨密度降低(P<0.05),胫骨和L_(4)椎体骨小梁数量、骨体积、骨体积分数减少(P<0.05),骨髓中wnt3a、β-catenin、LRP5 mRNA水平及蛋白表达降低(P<0.05);血清抗酒石酸酸性磷酸酶、Ⅰ型胶原交联C末端肽水平升高(P<0.05),胫骨和L_(4)椎体骨小梁间隙、结构模型指数升高(P<0.05),骨髓中DKK1、GSK3β的mRNA及蛋白表达升高(P<0.05);胫骨、L_(4)椎体骨小梁数量减少,结构紊乱、排列稀疏断裂;②与骨质疏松症组相比,跑台组大鼠血清骨特异性碱性磷酸酶、骨钙素水平升高(P<0.05),左股骨和L5椎体骨密度升高(P<0.05),胫骨骨小梁数量、骨体积、骨体积分数升高(P<0.05),骨髓中wnt3a、β-catenin、LRP5 mRNA及蛋白表达升高(P<0.05);血清抗酒石酸酸性磷酸酶、Ⅰ型胶原交联C末端肽水平降低,L_(4)椎体骨小梁间隙,胫骨骨小梁间隙、结构模型指数降低,骨髓中DKK1、GSK3β的mRNA水平及蛋白表达降低(P<0.05);胫骨、L_(4)椎体骨小梁数量明显增加,排列较规整致密,连成网状;③结果显示,跑台运动可能通过激活wnt/β-catenin信号通路改善老年大鼠骨质疏松。

黄葵胶囊通过Wnt/β-catenin通路保护IgA肾病大鼠的机制研究

目的探讨黄葵胶囊对IgA肾病大鼠保护作用的分子机制。方法采用血清白蛋白灌胃+四氯化碳皮下注射+脂多糖尾静脉注射建立IgA肾病模型。将健康雌性大鼠随机分为对照组(A组)、IgA肾病模型组(B组)、黄葵胶囊治疗组(C组)以及IgA肾病黄葵胶囊治疗组(D组)。C组和D组予黄葵胶囊灌胃。4周后收集大鼠血清、尿液和肾脏组织样本。观察肾脏病理变化;检测Wnt/β-catenin信号通路β-连环蛋白(β-catenin)、α平滑肌肌动蛋白(α-SMA)的相对mRNA表达;检测β-catenin和α-SMA的蛋白表达;检测24 h尿蛋白、血肌酐、血尿素氮的含量。结果24 h尿蛋白、血肌酐、血尿素氮肾脏损害指标、肾脏组织损害、β-catenin及α-SMA mRNA表达水平、β-catenin及α-SMA蛋白表达水平,与A组相比,C组均无明显差异,B组和D组均明显升高,差异具有统计学意义(P<0.05);与B组相比,D组明显降低,差异均有统计学意义(P<0.05)。结论黄葵胶囊对健康大鼠无明显肾脏保护作用,可以减轻IgA肾病大鼠的肾损害,降低Wnt/β-catenin通路表达,可能与其抑制Wnt/β-catenin信号通路活化有关。