舒林酸对HBV X基因转染的肝癌细胞Wnt信号通路的影响

目的探讨非甾体类抗炎药舒林酸(Sulindac)对HBV X基因转染的人肝癌SMMC7721细胞系Wnt信号通路的影响。方法用脂质体转染方法将HBx真核表达载体pcDNA3-X瞬时转染SMMC7721细胞(SMMC7721/HBx),以转染空载体pcDNA3的SMMC7721细胞组(SMMC7721/pcDNA3)及未转染质粒的SMMC7721细胞组(SMMC7721)为对照,于转染后72 h用RT-PCR和Western blot检测HBx的表达;并以各种浓度的舒林酸于瞬时转染后24 h干预SMMC7721/HBx组和SMMC7721/pcDNA3组至72 h,Western blot和免疫细胞化学检测β-catenin的表达,Western blot检测cyclinD1的表达。结果RT-PCR和Western blot显示,SMMC7721/HBx组在RNA及蛋白水平均有HBx的表达,而SMMC7721/pcDNA3组及SMMC7721组均无表达。与SMMC7721/pcD-NA3组及SMMC7721组相比,Western blot示SMMC7721/HBx组β-catenin、cyclinD1的表达水平较高,免疫细胞化学显示SMMC7721/HBx组β-catenin的表达水平较高,核染色较深,而SMMC7721/pcDNA3组及SMMC7721组之间则无明显差异。Westernblot和免疫细胞化学示一定浓度的舒林酸干预SMMC7721/HBx组和SMMC7721/pcDNA3组细胞48 h后可下调β-catenin和cy-clinD1的表达,而对SMMC7721/HBx组的下调较SMMC7721/pcDNA3组明显。结论HBx基因成功瞬时转染入SMMC7721细胞,激活Wnt信号通路,并同时上调cyclinD1的表达。舒林酸可通过下调β-catenin抑制肝癌细胞的Wnt信号通路,下调cyclinD1的表达,且HBx阳性的肝癌细胞对舒林酸较敏感。     

Wnt/β-catenin信号通路与肝癌发生发展的研究进展

已有研究表明肝癌的发生发展与多种信号通路有关.其中,Wnt配体/β-连环蛋白(Wnt/β-catenin)信号通路参与肝脏疾病进展的所有阶段,从最初的肝损伤到炎症、纤维化、肝硬化以及肿瘤的发生及进展均有所参与.异常的Wnt/β-catenin信号会促进包括癌症在内的不同肝脏疾病的发生和进展.在这篇综述中,我们将在介绍W...     

Wnt/β-catenin信号通路在肝癌中的研究进展

肝癌的发病机制复杂,细胞信号途径转导对其发生、发展起着至关重要的作用,目前倍受关注的是Wnt/β-catenin转导途径。已经发现Wnt/β-catenin信号通路主要通过激活其下游靶基因而导致肝癌的发生与发展。研究Wnt信号通路的调节因子及各信号通路之间的相互作用,深入探讨肝癌发生、发展及转移的机制,为寻找新的肝癌标志物和治疗靶点提供理论依据。现对肝癌中的Wnt信号异常作一综述。     

Wnt/β-catenin信号通路在肝癌发病机制中作用的研究

Wnt/β-catenin信号通路也称Wnt经典信号通路,参与调控细胞分化、癌变、凋亡及机体免疫、应激等多种病理生理过程。有研究表明Wnt信号通路与肝癌(hepatocellular carcinoma,HCC)的发生相关。深入研究Wnt/β-catenin信号通路在肝癌发病中的作用,将有助于进一步揭示肝癌的发病机制,为肝癌的防治提供新的可能途径及干预靶点。     

Wnt和Notch信号通路在肝癌发生发展中的作用研究进展

研究信号通路在肝脏中各自的调节机制及相互作用,深入探讨肝癌发生、发展的机制,可以为寻找新的治疗靶点提供理论依据。本文介绍了Wnt与Notch信号通路在肝脏功能发挥及其在肝癌发生发展中的作用。     

Caveolin-1和Wnt信号通路与消化道肿瘤

Caveolae是直径为50～100 nm的细胞表面特异性内陷结构,caveolin-1是caveolae的主要成分.Caveolin-1具有脚手架结构,在体外和原位能结合和抑制几种信使蛋白,与多种消化道肿瘤相关.Wnt/βcatenin途径涉及到多个部位的肿瘤发生.Caveolin-1能通过Wnt信号途径抑制肿瘤发生.     

Wnt信号通路在结肠癌中的表达及其作用机制

目的探讨Wnt信号通路在结肠癌中的表达及其相关的分子机制。方法用酶联免疫吸附法(ELISA)检测所有参与者(65例结肠癌和30例健康人)血清中半乳糖凝集素(galectin)-3的含量,观察galectin-3和人结肠癌发病的关系,荧光实时定量PCR检测人结肠癌组织和癌旁组织中相关基因的表达。Western印迹检测人结肠癌组织和癌旁组织中相关蛋白的表达水平,包括轴蛋白基因(AXIN)、β-catenin,c-myc和cyclin D1蛋白。结果血清中的galectin-3水平在结肠癌Ⅲ期患者血清中的含量较健康对照组明显升高(P0.01)。结肠癌组织中AXIN mRNA表达水平下降,β-catenin mRNA表达水平不变但其下游分子c-myc和cyclin D1基因的表达水平升高。β-catenin、c-myc和cyclin D1蛋白水平均升高,Wnt信号通路明显激活。结论在结肠癌患者血清中galectin-3水平明显升高,AXIN表达水平降低,其可以活化Wnt信号通路,激活后的Wnt信号通路通过β-catenin上调细胞增殖相关因子c-myc和cyclin D1水平的升高,促进结肠癌细胞的增殖。     

Wnt信号通路与纤维化

Wnt信号通路分为正规通路和非正规通路,是重要的细胞信号转导途径,该通路参与了从胚胎到成体的一系列控制胚胎早期发育,决定细胞分化、增殖及生长的调控,异常表达或激活该信号途径会导致多种疾病甚至肿瘤发生。最近研究表明Wnt信号通路与全身多种器官的组织细胞活化及组织纤维化发生相关。深入研究Wnt信号通路在组织纤维化尤其是蛛网膜纤维化发生中的作用,将有助于进一步揭示蛛网膜纤维化的发生机制,为蛛网膜纤维化及出血后慢性脑积水的防治提供新的可能途径及干预靶点。     

Wnt/β-catenin信号通路相关分子在肝癌靶向治疗中的研究进展

肝癌发病率及病死率均较高Wnt/β环连蛋白(β-catenin)信号通路中多个环节发生异常改变都可能与肝癌发生、发展密切相关,着力于该信号通路的靶向治疗成为研究的热点。目前,在肝癌中开展了以Wnt/β-catenin信号通路激活起始分子Wnt蛋白、胞膜Wnt受体和辅助受体、胞膜胞内信号传递衔接子、胞内复合体、核内转录复合体及信号通路抑制子为靶点的实验研究,应用前景广阔,但真正运用于临床尚需时日。     

Meta‐analysis: Association between hepatitis B virus preS mutation and hepatocellular carcinoma risk

Previous observational studies suggested that hepatitis B virus (HBV) preS mutation plays an important role in the existence of HBV‐related hepatocellular carcinoma (HCC). However, the results are still debatable. With an increasing number of studies about this topic, this study employed a meta‐analysis to identify the association between HBV preS mutation and HCC risk. We searched for eligible studies from PubMed, ProQuest, CINAHL, ScienceDirect and Springer databases to assess the association between HBV mutation and HCC risk. This meta‐analysis was conducted using RevMan 5.3 to provide pooled estimate for odds ratio (ORs) with 95% confidence intervals (95% CIs). Twenty‐one clinical studies were included in this meta‐analysis study which consisted of 1738 participants with HBV‐related HCC and 3740 HBsAg‐positive patients without HCC. All studies used samples of Asian population. PreS deletion was the most common mutation found in all studies. We found that ORs of HBV overall preS deletion was associated with HCC (OR = 3.28; 95% CI = 2.32‐4.65; P < .00001; random‐effects model). Each preS1 and preS2 deletion was associated with increased risk of HCC, with OR 2.42 (95% CI = 1.25‐4.68, P = .008) and 3.36 (95% CI = 2.04‐5.55, P < .00001), respectively. PreS2 start codon mutation was also significantly associated with HCC risk (OR = 2.47; 95% CI: 1.15‐5.27; P = .02; random‐effect model). The result of this meta‐analysis suggested that HBV preS deletion (all, preS1 and preS2) and preS2 start codon mutation might contribute to the increased risk of HBV‐related HCC.     

NF-κB信号传导通路相关基因不同表型肝癌患者尿8-OHdG水平观察

目的观察NF-κB信号传导通路相关基因不同表型的肝癌患者尿8-羟基脱氧鸟苷（8-OHdG）水平。方法 PCR-RFLP法检测155例肝癌患者（肝癌组）NF-κB信号传导通路中TNF-α、NF-κB、iNOS、COX-2的基因表型。采用ELISA法检测肝癌组及151例健康体检者（对照组）的尿8-OHdG。结果肝癌组尿8-OHdG水平为（9.29±8.04）ng/mg Cr,对照组为（7.27±5.06）ng/mg Cr,两组相比,P〈0.05。肝癌组NF-κB信号传导通路相关基因TNF-α、NF-κB、iNOS、COX-2基因不同表型组尿8-OHdG水平相比,P均〉0.05。结论肝癌患者尿8-OHdG水平高于正常,可能与肝癌发病有关。NF-κB信号传导通路相关基因多态性与肝癌患者尿8-OHdG水平无明显关系。     

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 betacatenin expression. CONCLUSION： These data indicate that the mutationsin AXIN1 and AXIN2 may contribute to gastric carcinogenesis.     

Wnt信号转导通路与肝纤维化关系的研究现况

阻断该通路可以 Wnt 信号转导通路是近年来分子生物学、细抑制癌细胞的增殖和诱导凋亡.胞生物学和肿瘤研究中的一大热点,其参与调 控细胞分化、癌变、凋亡及机体免疫、应激 等多种病理生理过程.目前许多关于癌症方面 的研究均已证实,阻断Wnt 信号通路可以诱导 癌症细胞的凋亡.肝纤维化的发生与多种信号 通路的激活相关,有研究...     

HBV基因突变与肝细胞癌发生关系研究进展

HBV感染是引起肝细胞癌(hepatocellular carcinoma,HCC)发生的主要因素,我国HCC患者中的HBs Ag阳性率为60%~70%,因此HBV防治成为全球医疗热点问题。HBV包含4个开放阅读框(pre S/S、pre C/C、P、X),它们中的各种点突变、缺失、插入及截短突变与HCC发生相关。一些突变和乙型肝炎重症化有关,可作为预测HCC发生的生物学指标;一些突变产生的特定HBV抗原直接或间接调节细胞周期及细胞凋亡等相关蛋白分子,促进细胞增殖及染色体不稳定,增加HCC发生风险。     

Expression of hepatic Wnt5a and its clinicopathological features in patients with hepatocellular carcinoma

Backgroud: Wingless-type MMTV integration site family member 5 a(Wnt5 a) is involved in carcinogenesis. However, little data are available in Wnt5 a signaling with hepatocellular carcinoma(HCC). In the present study, we investigated the expression of hepatic Wnt5 a in HCC and the role of Wnt5 a in HCC progression and outcome.Methods: Wnt5 a expression and cellular distribution in HCCs and their matched paracancerous tissues from 87 patients were analyzed with tissue microarray and immunohistochemistry and compared with hepatic Wnt3 a signaling. Wnt5 a expression was categorized into low or high based on immunohistochemistry. Overall survival rate of HCC patients was estimated in correlation with the hepatic Wnt5 a level using Kaplan–Meier method; the survival difference between patients with low and those with high Wnt5 a was compared with log-rank test; and prognostic analysis was carried out with Cox regression.Results: Total incidence of Wnt5 a expression in the HCC tissues was 70.1%, which was significantly lower(χ~2= 13.585, P 0.001) than that in their paracancerous tissues(88.5%). Significant difference of Wnt5 a intensity was found between HCC and their paracancerous tissues(Z = 8.463, P 0.001). Wnt5 a intensity was inversely correlated with Wnt3 a signaling(r =-0.402, P 0.001) in HCC tissues. A decrease of Wnt5 a expression in relation to the clinical staging from stage I to IV and low or no staining at advanced HCC were observed. Wnt5 a level was related to periportal embolus(χ~2= 11.069, P 0.001), TNM staging(χ~2= 8.852, P 0.05), 5-year survival(χ~2= 4.961, P 0.05), and confirmed as an independent prognosis factor of HCC patients(hazard ratio: 1.957; 95% confidence interval: 1.109–3.456; P 0.05).Conclusions: The decrease of hepatic Wnt5 a signaling is associated with HCC progression and poor prognosis.     

联合检测HBV前S1抗原和核心抗原的临床意义

探讨联合检测血清HBV前s1抗原（preSl）和核心抗原（HBcAg）（均为HBV核酸相关抗原，nucleic acids related antigen，HBV NRAg）的意义及临床价值。方法：采用ELISA法对393份HBsAg、HBV DNA双阳性的血清和612份HBsAg阴性血清进行HBV NRAg检测，所有标本均采用多区段巢式PCR确认阳性、阴性，采用荧光定量PCR法进行HBV DNA定量分析。结果：393份HBsAg、HBV DNA双阳性血清中，HBV NRAg阳性为382份，其阳性率为97．2％；612份HBsAg阴性的血清标本中，609份确认为HBV DNA阴性，其中检出2份HBV NRAg阳性，607份为阴性，其HBV NRAg的阴性率为99．7％（607／609），另3份HBsAg阴性血清HBV DNA阳性者，其HBV NRAg均为阳性。结论：联合检测preSl和HBcAg的HBV NRAg可作为临床HBV感染的筛选及判断HBV复制的有意义的补充项目。