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.

SMAD specific E3 ubiquitin protein ligase 1 accelerates diabetic macular edema progression by WNT inhibitory factor 1

BACKGROUND Diabetic macular edema(DME)is the most common cause of vision loss in people with diabetes.Tight junction disruption of the retinal pigment epithelium(RPE)cells has been reported to induce DME development.SMAD-specific E3 ubiquitin protein ligase(SMURF)1 was associated with the tight junctions of cells.However,the mechanism of SMURF1 in the DME process remains unclear.AIM To investigate the role of SMURF1 in RPE cell tight junction during DME.METHODS ARPE-19 cells treated with high glucose(HG)and desferrioxamine mesylate(DFX)for establishment of the DME cell model.DME mice models were constructed by streptozotocin induction.The trans-epithelial electrical resistance and permeability of RPE cells were analyzed.The expressions of tight junction-related and autophagy-related proteins were determined.The interaction between insulin like growth factor 2 mRNA binding protein 2(IGF2BP2)and SMURF1 mRNA was verified by RNA immunoprecipitation(RIP).SMURF1 N6-methyladenosine(m6A)level was detected by methylated RIP.RESULTS SMURF1 and vascular endothelial growth factor(VEGF)were upregulated in DME.SMURF1 knockdown reduced HG/DFX-induced autophagy,which protected RPE cell tight junctions and ameliorated retinal damage in DME mice.SMURF1 activated the Wnt/β-catenin-VEGF signaling pathway by promoting WNT inhibitory factor(WIF)1 ubiquitination and degradation.IGF2BP2 upregulated SMURF1 expression in an m6A modification-dependent manner.CONCLUSION M6A-modified SMURF1 promoted WIF1 ubiquitination and degradation,which activated autophagy to inhibit RPE cell tight junctions,ultimately promoting DME progression.

Characterization of Wnt1-inducible Signaling Pathway Protein-1 in Obese Children and Adolescents

Wnt1-inducible signaling pathway protein-1(WISP1),a member of the CCN family,is increasingly being recognized as a potential target for obesity and type 2 diabetes mellitus.Recent studies have shown that WISP1 can regulate low-grade inflammation in obese mice,and circulating WISP1 levels are associated with obesity and type 2 diabetes mellitus in adults.Herein,we measured serum WISP1 levels in obese youth and explored its relationships with pro-inflammatory cytokine interleukin 18(IL-18)and other metabolic indexes.Totally,44 normal-weight and 44 obese children and adolescents were enrolled.Physical and laboratory data were recorded,and then serum levels of WISP1 and IL-18 were determined by enzyme-linked immunosorbent assays.Results showed that serum levels of WISP1 were significantly higher in obese children and adolescents than in normal-weight healthy controls (1735.444-15.29 vs. 1364.084-18.69 pg/mL).WISP1 levels were significantly positively correlated with body mass index (BMI)and BMI z-score (r=0.392,P=0.008;r=0.474,P=0.001,respectively) in obese group;circulating IL-18 was increased in obese individuals (1229.064-29.42 vs. 295.874-13.30 pg/mL).Circulating WISP1 levels were significantly correlated with IL-18 (r=0.542,P<0.001),adiponectin (r=0.585,P<0.001)and leptin (r=0.592,P<0.001).The multivariate stepwise regression analysis showed that higher IL-18 levels represented the main determinant of increased WISP1 levels after adjusting for BMI,waist circumference, fasting insulin,homeostatic model assessment of insulin resistance (HOMA-IR)and HbAlc in obese individuals (β=0.542,P=0.000).WISP1 can be involved in glucose/lipid metabolism in obese youth,which may be modulated by IL-18.Increased WISP1 levels may be a risk factor of obesity and insulin resistance,and WISP1 has a potential therapeutic effect on insulin resistance in obese children and adolescents.

Mutations in components of the Wnt signaling pathway in gastric cancer

AIM: To explore the contribution of AXIN1, AXIN2 and beta-catenin, components of Wnt signaling pathway, to the carcinogenesis of gastric cancer (GC), we examined AXIN1, AXIN2 exon7 and CTNNB1 (encoding beta- catenin) exon3 mutations in 70 GCs. METHODS: The presence of mutations was identified by polymerase chain reaction (PCR)-based denaturing high-performance liquid chromatography and direct DNA sequencing. Beta-catenin expression was detected by immunohistochemical analysis. RESULTS: Among the 70 GCs, 5 (7.1%) had mutations in one or two of these three components. A frameshift mutation (1 bp deletion) in exon7 of AXIN2 was found in one case. Four cases, including the case with a mutation in AXIN2, had frameshift mutations and missense mutations in AXIN1. Five single nucleotide polymorphisms (SNPs), 334 C>T, 874 C>T, 1396 G>A, 1690 C>T and 1942 T>G, were identified in AXIN1. A frameshift mutation (27 bp deletion) spanning exon3 of CTNNB1 was observed in one case. All four cases with mutations in AXIN1 and AXIN2 showed nuclear beta- catenin expression. CONCLUSION: These data indicate that the mutationsin AXIN1 and AXIN2 may contribute to gastric carcino- genesis.

Involvement of the Wnt signaling pathway and cell apoptosis in the rat hippocampus following cerebral ischemia/reperfusion injury

We investigated the role of the Wnt signaling pathway in cerebral ischemia/reperfusion injury by examining β-catenin and glycogen synthase kinase-3β protein expression in the rat hippocampal CA1 region following acute cerebral ischemia/reperfusion. Our results demonstrate that cell apoptosis increases in the CA1 region following ischemia/reperfusion. In addition, β-catenin and glycogen synthase kinase-3β protein expression gradually increases, peaking at 48 hours following reperfusion. Dickkopf-1 administration, after cerebral ischemia/reperfusion injury, results in decreased cell apoptosis, and β-catenin and glycogen synthase kinase-3β expression, in the CA1 region. This suggests that β-catenin and glycogen synthase kinase-3β, both components of the Wnt signaling pathway, participate in cell apoptosis following cerebral ischemia/reperfusion injury.

外源性p53诱导肝癌细胞Wnt通路抑制因子Dickkopf-1的表达

研究p53对Wnt通路抑制抑制因子Dickkopf-1(DKK-1)表达的调节作用。将携带p53基因的复制缺陷型腺病毒栽体(Adp53)导入到p53缺失的人肝癌细胞株Hep3B中,以RT-PCR技术检测p53对DKK-1表达的调节作用。检测结果表明DKK-1mRNA水平在转染p53 20 h后即有明显升高,其中以32 h达最高水平,随后逐渐降低。量效关系研究表明在转染剂量为0.5、5、50 pfu/cell的Adp53时DKK-1mRNA表达均有显著增高,尤以50 pfu/cell时表达水平最高。提示p53能明显诱导Wnt通路抑制因子DKK-1的mRNA表达。

Wnt阻滞剂Dickkopf-1对肾小管上皮细胞转分化的抑制作用

目的研究Wnt阻滞剂Dickkopf-1(Dkk-1)对转化生长因子β1(TGF-β1)诱导的肾小管上皮细胞-间充质转分化的影响。方法体外培养人近端肾小管上皮细胞(HKC),收集后分3组:对照组细胞以含10%胎牛血清的培养基常规培养,TGF-β1组在常规培养基中加入TGF-β1(终浓度20ng/ml),TGF-β1+Dkk-1组同时加入TGF-β1(终浓度20ng/ml)和Dkk-1(终浓度100ng/ml)。培养48h后在倒置相差显微镜下进行形态观察,分别采用RT-PCR和Western blotting检测Wnt4、β-catenin、E-cadherin、α-SMA mRNA及蛋白表达情况,细胞免疫荧光染色观察E-cadherin和α-SMA的表达。结果与对照组比较,TGF-β1组和TGF-β1+Dkk-1组Wnt4 mRNA和蛋白表达水平均显著增高(P<0.05),后两组间差异无统计学意义(P>0.05)。β-catenin mRNA表达在各组之间差异无统计学意义(P>0.05)。β-catenin蛋白在对照组呈低表达,TGF-β1组表达明显上调,TGF-β1+Dkk-1组较TGF-β1组表达下调(P<0.05),与对照组比较差异无统计学意义(P>0.05)。E-cadherin mRNA和蛋白在对照组呈高表达,TGF-β1组表达明显降低,TGF-β1+Dkk-1组较TGF-β1组表达显著增高(P<0.05),与对照组比较差异无统计学意义(P>0.05)。α-SMA mRNA和蛋白表达在对照组和TGF-β1+Dkk-1组的表达均较TGF-β1组明显降低(P<0.05)。细胞免疫荧光染色显示E-cadherin和α-SMA表达与RT-PCR和Western blotting检测结果一致。结论 Wnt阻滞剂Dickkopf-1能抑制TGF-β1诱导的肾小管上皮细胞转分化。

Wnt信号通路抑制因子Dickkopf-1在宫颈癌中的研究进展

Wnt信号通路的异常激活在肿瘤的发病和进展过程中发挥着重要作用。Dickkopf-1(DKK-1)作为Dickkopf家族中的一员,是经典Wnt信号通路的胞外拮抗剂。目前研究发现,经典Wnt信号通路和DKK-1参与宫颈癌的发生、发展,抗DKK-1中和抗体BHQ880治疗多发性骨髓瘤已经进入临床Ⅰ/Ⅱ期试验。现就DKK-1在宫颈癌中的研究进展予以综述,为宫颈癌的诊断、治疗及预后判断提供一个新的、重要的生物学标志物。

血清胸苷激酶1、细胞角质蛋白19片段抗原21-1及dickkopfWNT信号通路抑制剂1对食管癌的诊断价值

目的探讨血清胸苷激酶1(TK1)、细胞角质蛋白19片段抗原21-1(CYFRA21-1)及dickkopf WNT信号通路抑制剂1(DKK1)对食管癌的诊断价值。方法选取62例食管癌患者作为食管癌组,59例健康体检者作为对照组。对比两组受试者TK1、CYFRA21-1、DKK1水平,对比不同分期食管癌患者TK1、CYFRA21-1、DKK1水平,分析TK1、CYFRA21-1、DKK1单独及联合检测对食管癌的诊断价值。结果食管癌组患者TK1、CYFRA21-1、DKK1水平均明显高于对照组,差异均有统计学意义(P﹤0.01)。Ⅲ~Ⅳ期食管癌患者TK1、CYFRA21-1、DKK1水平均明显高于Ⅰ~Ⅱ期患者,差异均有统计学意义(P﹤0.01)。TK1+CYFRA21-1+DKK1联合检测诊断食管癌的灵敏度和特异度分别为88.50%、79.10%,曲线下面积为0.779(95%CI:0.695~0.864),均高于三者单独检测。结论TK1、CYFRA21-1、DKK1联合检测有利于提高食管癌的诊断效能,防止误诊漏诊,三者对其病情评估具有一定参考价值。

Wnt通路抑制因子Dickkopf-1的表达作用

目的:研究Wnt通路抑制因子Dickkopf-1(DKK-1)的表达作用。方法:将携带p53基因的复制缺陷型腺病毒载体(Adp53)导入到p53完全缺失的人肝癌细胞株Hep3B中,并以Wnt通路的关键因子β-链接蛋白(-βcatenin)的改变为功能指标评价Wnt通路的变化。以逆转录聚合酶链反应(RT-PCR)技术检测Wnt通路抑制因子DKK-1表达的调节作用,以流式细胞术检测Adp53的转基因情况和-βcatenin的表达。结果:DKK-1mRNA水平在转染Adp53 20h后即有明显升高32h达最高水平,随后逐渐降低。量效关系研究表明在转染Adp53剂量为0.5,5,50pfu/cell时DKK1mRNA表达均有显著增高,尤以50pfu/cell时表达水平最高。-βcatenin表达水平随着转染时间和转染剂量的增加,阳性细胞百分比强度和平均荧光量强度表达水平逐渐下降。结论:外源性p53能够诱导Wnt通路抑制剂DKK-1的表达,进而产生抑制Wnt通路的作用。

外源性p53对Wnt通路抑制因子Dickkopf-1的表达作用

目的研究外源性p53对W nt通路抑制因子D ickkopf-1(DKK-1)的表达作用。方法将携带p53基因的复制缺陷型腺病毒载体(Adp53)导入到p53完全缺失的人肝癌细胞株Hep3B中,并以p53反以寡核苷酸阻断p53阳性细胞p53的表达,以W nt通路的关键因子-βcaten in的改变为功能指标评价W nt通路的变化。以RT-PCR技术检测W nt通路抑制因子DKK-1表达的调节作用,以流式细胞术检测Adp53的转基因情况,肝癌细胞中p53和β-caten in的表达。结果DKK-1mRNA水平在转染Adp53 20 h后即有明显升高,32 h达最高水平,随后逐渐降低。β-caten in表达水平随着转染时间和转染剂量的增加,阳性细胞百分比强度和平均荧光量强度表达水平逐渐下降。以p53反以寡核苷酸阻断p53阳性细胞p53表达后,抑制剂DKK-1的表达逐渐降低,-βcaten in表达水平逐渐增加。结论外源性p53能明显诱导W nt通路抑制剂DKK-1的表达,进而产生抑制W nt通路的作用。

Dickkopf-1调控Wnt通路在缺氧诱导的晶状体上皮细胞转分化中的作用

目的:探讨缺氧条件下Wnt/β-catenin通路在晶状体上皮细胞上皮-间充质转化(EMT)中的作用,分析Dickkopf-1(DKK-1)的表达对晶状体上皮细胞EMT的影响。方法:将体外培养人晶状体上皮细胞(HLEB3细胞)分为正常氧培养组(加入含10%FBS的DMEM培养液)和缺氧培养组(加入含100μmol/L CoCl 2溶液的培养液进行缺氧处理6、12、24、48h)。利用免疫荧光染色法检测Wnt3a和DKK-1蛋白的表达及β-catenin蛋白的表达和定位;利用qRT-PCR法检测DKK-1 mRNA的表达。结果:免疫荧光染色结果显示,随着缺氧时间的延长,HLEB3细胞中Wnt3a和DKK-1蛋白表达水平明显上调,β-catenin蛋白在细胞核内积聚逐渐增多。qRT-PCR检测结果显示,与正常氧培养组相比较,缺氧培养6h组细胞中DKK-1 mRNA无显著差异(P>0.05),而缺氧培养12、24、48h组细胞中DKK-1 mRNA表达明显增加(P<0.001)。结论:缺氧可以激活晶状体上皮细胞Wnt/β-catenin通路,并诱导Dickkopf-1的表达,参与调控Wnt/β-catenin通路,影响EMT进程。

CYP24A1 Involvement in Inflammatory Factor Regulation Occurs via the Wnt Signaling Pathway

Objective While the upregulation of cytochrome P450 family 24 subfamily A member 1(CYP24A1)gene expression has been reported in colon cancer,its role in tumorigenesis remains largely unknown.In this study,we aimed to investigate the involvement of CYP24A1 in Wnt pathway regulation via the nuclear factor kappa B(NF-κB)pathway.Methods The human colon cancer cell lines HCT-116 and Caco-2 were subjected to stimulation with interleukin-6(IL-6)as well as tumor necrosis factor alpha(TNF-α),with subsequent treatment using the NF-κB pathway-specific inhibitor ammonium pyrrolidinedithiocarbamate(PDTC).Furthermore,CYP24A1 expression was subjected to knockdown via the use of small interfering RNA(siRNA).Subsequently,NF-κB pathway activation was determined by an electrophoretic mobility shift assay,and the transcriptional activity ofβ-catenin was determined by a dual-luciferase reporter assay.A mouse ulcerative colitis(UC)-associated carcinogenesis model was established,wherein TNF-αand the NF-κB pathway were blocked by anti-TNF-αmonoclonal antibody and NF-κB antisense oligonucleotides,respectively.Then the tumor size and protein level of CYP24A1 were determined.Results IL-6 and TNF-αupregulated CYP24A1 expression and activated the NF-κB pathway in colon cancer cells.PDTC significantly inhibited this increase in CYP24A1 expression.Additionally,knockdown of CYP24A1 expression by siRNA could partially antagonize Wnt pathway activation.Upregulated CYP24A1 expression was observed in the colonic epithelial cells of UC-associated carcinoma mouse models.Anti-TNF-αmonoclonal antibody and NF-κB antisense oligonucleotides decreased the tumor size and suppressed CYP24A1 expression.Conclusion Taken together,this study suggests that inflammatory factors may increase CYP24A1 expression via NF-κB pathway activation,which in turn stimulates Wnt signaling.

红细胞沉降率、血清白蛋白及dickkopf WNT信号通路抑制剂1在多发性骨髓瘤中的表达及对预后的预测价值分析

目的探讨红细胞沉降率(ESR)、血清白蛋白(ALB)、dickkopf WNT信号通路抑制剂1(DKK1)在多发性骨髓瘤(MM)中的表达及对预后的预测价值。方法选取106例MM患者作为MM组,另选取同期100例健康体检者作为健康对照组,比较两组受试者ESR、ALB、DKK1水平。根据预后情况,将MM患者分为死亡组(n=14)和生存组(n=92),比较两组患者ESR、ALB、DKK1水平。采用受试者工作特征(ROC)曲线分析ESR、ALB、DKK1单独及联合检测对MM的诊断价值及对MM患者预后的预测价值。结果MM组患者ESR、DKK1均明显高于健康对照组,ALB明显低于健康对照组,差异均有统计学意义(P<0.01)。死亡组患者ESR、DKK1均明显高于生存组,ALB明显低于生存组,差异均有统计学意义(P<0.01)。ROC曲线显示,ESR、ALB、DKK1联合检测对MM的诊断价值及对MM患者预后的预测价值均高于任一指标单独检测。结论ESR、DKK1在MM中高表达,ALB在MM中低表达,ESR、ALB、DKK1联合检测对MM具有较好的诊断效能,可作为MM发生发展及预后判断的辅助参考指标,值得临床推广应用。

Angelica sinensis polysaccharides ameliorate 5-flourouracil-induced bone marrow stromal cell proliferation inhibition via regulating Wnt/β-catenin signaling

Chemotherapy may cause cellular oxidative stress to bone marrow.Oxidative damage of bone marrow hematopoietic microenvironment is closely related to chronic myelosuppression after chemotherapeutic treatment.Angelica sinensis polysaccharides(ASP)are major effective ingredients of traditional Chinese medicine Angelica with multi-target anti-oxidative stress features.In the current study,we investigated the protective roles and mechanisms of ASP on chemotherapy-induced bone marrow stromal cell(BMSC)damage.The human bone marrow stromal cell line HS-5 cells were divided into control group,5-FU group,5-FU+ASP group,and 5-FU+LiCl group to investigate the mechanism of ASP to alleviate 5-FU-induced BMSC proliferation inhibition.The results showed that 5-FU inhibits the growth of HS-5 cells in a time and dose-dependent manner;however,ASP partially counteracted the 5-FU-induced decrease in cell viability,whereas Wnt signaling inhibitor Dkk1 antagonized the effect of ASP on HS-5 cells.ASP reversed the decrease in total cytoplasmicβ-catenin,p-GSK-3β,and CyclinD1 following 5-FU treatment and modulated nuclear expression ofβ-catenin,Lef-1,and C-myc proteins.Furthermore,ASP also enhanced the antioxidant capacity of cells and reduced 5-FU-induced oxidative stress,attenuated FoxO1 expression,thus weakened its downstream apoptosis-related proteins and G0/G1 checkpoint-associated p27^(Kip1) expression to alleviate 5-FU-induced apoptosis and to promote cell cycle progression.All the results above suggest that the protective role of ASP in 5-FU-treated BMSCs proliferation for the chemotherapy may be related to its activating Wnt/β-catenin signaling and keeping homeostasis betweenβ-catenin and FoxO1 under oxidative stress.The study provides a potential therapeutic strategy for alleviating chemotherapeutic damage on BMSCs.

Tip60-siRNA Regulates ABCE1 Acetylation and Inhibits the Proliferation, Migration and Invasion of Esophageal Cancer via the Wnt Pathway

Objective: To investigate the effect of Tip60 gene silencing on the ABCE1 acetylation level and cell proliferation, migration and invasion in TE-1 cells of oesophageal cancer. Methods: The siRNA sequence of Tip60 was transfected with esophageal cancer TE-1 cells. Transfected siRNA vector cells were used as experimental group (si-T), siRNA no-loaded somatic cells were transfected as control group (si-NC), and untransfected TE-1 cells were used as blank group (Group N). ABCE1 mRNA was detected by qRT-PCR, the expression of ABCE1 protein, proliferation-related protein β catenin (β-catenin), GSK3β, and c-myc by Western blot, the protein acetylation level by immunoprecipitation, MTT assay for cell viability, scratch healing and Transwell compartment assay for migration and invasion ability. Results: After 48 h downregulation of the Tip60 gene, TE-1 cells showed no significant changes in the ABCE1 mRNA and protein expression. The acetylation level of ABCE1 decreased significantly, compared with the control group and the blank group. After Tip60 gene silencing, the expression of β-catenin and c-myc protein decreased, while the expression of GSK-3β protein increased. Cytofunctology experiments showed that the proliferative activity, migration and invasion ability of TE-1 cells in the experimental group were significantly inhibited. Conclusion: Down regulation of Tip60 gene can deacetylate ABCE1 protein and inhibit the proliferation activity, migration and invasion ability of esophageal cancer by blocking the conduction of Wnt signaling pathway.

Wnt信号通路抑制因子DKK-1在骨质疏松发生中的研究进展

Wnt信号通路对成骨细胞的发育及分化起着重要作用。近年来的研究发现,作为Wnt信号通路的抑制因子DKK-1能抑制骨形成,导致骨质疏松,而通过拮抗DKK-1的作用可使骨量增加。DKK-1可能成为治疗骨质疏松的新靶点。笔者对DKK-1在成骨细胞中的信号传导途径及其在骨质疏松中的作用做了综述。

股骨颈骨折患者围术期血清骨硬化蛋白及Dickkopf-1蛋白水平变化规律及意义

目的探讨股骨颈骨折患者围术期血清骨硬化蛋白（SOST）和Dickkopf-1（Dkk-1）蛋白的变化规律及临床意义。方法选择2014年8月~2015年8月于南京大学医学院附属鼓楼医院行股骨颈骨折关节置换术患者45例为实验组,采集患者术前1 d及术后1、3、5 d空腹静脉血样;选择同期45例年龄、性别、体重指数配对的健康体检者作为对照组。检测两组患者血清中SOST和Dkk-1水平并进行分析。结果实验组患者术前血清SOST为1.3（1,2.39）ng/m L,Dkk-1为（2.87±1.08）ng/m L,明显低于照组[SOST为1.95（1.64,2.64）ng/m L,Dkk-1为（3.66±1.21）ng/m L]（P〈0.01）。实验组患者围术期血清SOST与Dkk-1均呈先升高后下降的趋势,且两者呈正相关（P〈0.05）。血清SOST在术后1 d迅速升高至1.49（1.07,1.99）ng/m L,术后3 d降至1.3（0.97,2.1）ng/m L,术后5 d迅速降至1.01（0.91,1.55）ng/m L,与术前比较差异均有统计学意义（P〈0.05）。血清Dkk-1在术后1 d显著升高至（3.04±1.04）ng/m L,术后3 d升至（3.07±1.19）ng/m L,术后5 d降至（2.93±1.08）ng/m L,但术后3、5 d值与术前比较,差异无统计学意义（P〉0.05）。结论围术期股骨颈骨折关节置换术患者血清SOST与Dkk-1均呈先升高后下降的趋势。血清SOST术后变化较DKK-1更敏感,趋势更显著,可作为骨折后机体成骨能力的标志物及潜在的药物治疗靶点。

增殖性糖尿病视网膜病变患者血清Dickkopf-1水平分析

目的通过酶联免疫吸附试验（enzyme-linked immunosorbent assay,ELISA）检测增殖性糖尿病视网膜病变（proliferative diabetic retinopathy,PDR）患者血清中的Dickkopf-1（DKK1）蛋白浓度,探讨Wnt信号通路在PDR发病中的作用。方法纳入2014年6月至12月于北京安贞医院及北京同仁医院眼科接受玻璃体视网膜手术的28例PDR患者及25例年龄、性别相匹配的非糖尿病对照组。通过ELISA法检测PDR组和对照组、活跃期和静止期PDR组血清中的DKK1蛋白浓度,分别比较组间的DKK1水平差异。结果 PDR组血清DKK1蛋白浓度为96.14~1303.65 pg·mL-1,平均为491.79 pg·mL-1;对照组血清DKK1蛋白浓度为250.36~1520.92 pg·mL-1,平均为882.38 pg·mL-1;两组相比,差异有统计学意义（P=0.002）。静止期PDR组血清DKK1蛋白平均浓度为683.35 pg·mL-1,高于活跃期PDR组（275.48 pg·mL-1）,差异有统计学意义（P=0.022）。结论 PDR患者血清中DKK1蛋白水平明显降低,提示Wnt信号通路可能在PDR病理过程中发挥作用。

Wnt信号通路拮抗剂Dkk1调节骨代谢的最新进展

背景:Dickkopf-1(Dkk1)是一种Wnt信号通路的可溶性胞外抑制剂,可以通过竞争性地结合Wnt蛋白的共同受体低密度脂蛋白受体相关蛋白5/6来阻断经典Wnt/β-catenin途径,进而调控Wnt/β-catenin途径下游靶基因的转录。目的:将Dkk1调节骨代谢的最新进展作一综述,为骨疾病的抗Dkk1治疗提供理论基础。方法:电子检索CBM和Medline数据库中1995至2012年关于Dkk1对骨代谢调节作用的文章,检索词为"Dkk1;骨重塑;骨疾病"和"Dkk1;bone remodeling;bone diseases"。纳入关于Dkk1调节骨代谢的高质量文献,排除重复发表文献。结果与结论:初始检索118篇文献,按纳入排除标准筛选后,选出36篇文献进行综述。骨组织时刻处于动态的重塑过程中,成骨细胞和破骨细胞的相互作用决定着骨形成和骨吸收之间的平衡。Dkk1可阻断Wnt/β-catenin信号通路、抑制骨形成,同时又通过与骨保护素/核因子ΚB受体活化因子配体/前体细胞表面受体轴的串话作用促进破骨细胞的分化与成熟。促进骨形成、抑制骨吸收是抗Dkk1治疗骨代谢相关疾病引起骨质缺失的主要机制与思路,且临床试验结果良好,Dkk1是一个非常有潜力的骨代谢疾病治疗靶点。