目的:探讨血清生物标志物甲胎蛋白(AFP)、维生素K缺失或拮抗剂Ⅱ诱导的蛋白质(PIVKA-Ⅱ)和磷脂酰肌醇蛋白聚糖3(GPC-3)单独或联合用于肝细胞癌(以下简称肝癌)诊断的价值。方法:检索PubMed、Web of Science、Embase三个数据库,收集2002...目的:探讨血清生物标志物甲胎蛋白(AFP)、维生素K缺失或拮抗剂Ⅱ诱导的蛋白质(PIVKA-Ⅱ)和磷脂酰肌醇蛋白聚糖3(GPC-3)单独或联合用于肝细胞癌(以下简称肝癌)诊断的价值。方法:检索PubMed、Web of Science、Embase三个数据库,收集2002年以来发表的AFP、PIVKA-Ⅱ和GPC-3单独或联合用于诊断肝癌的文献。根据纳入和排除标准筛选文献并提取相关数据。利用诊断准确性研究的质量评价(QUADAS)检查表对纳入的文献进行质量评价,并采用Meta DiSc软件、Review Manager 5.4软件和Stata 15.1软件对AFP、PIVKA-Ⅱ和GPC-3单用和联合使用诊断肝癌的受试者工作特征曲线下面积(AUC)、敏感度、特异度等指标进行数据分析。结果:共纳入32篇文献。Meta分析结果显示,单个标志物用于诊断肝癌时,PIVKA-Ⅱ的AUC值最高,为0.88(95%CI:0.85~0.91),其次是GPC-3和AFP;多个标志物联合用于诊断肝癌的AUC均高于单个标志物,其中PIVKA-Ⅱ联合GPC-3诊断的AUC值最高,为0.90(95%CI:0.87~0.92)。单个标志物用于诊断肝癌时,PIVKA-Ⅱ和GPC-3的敏感度相对较高(分别为0.75和0.76),但GPC-3的特异度不如PIVKA-Ⅱ和AFP(AFP、PIVKA-Ⅱ和GPC-3分别为0.87、0.88和0.81);多个标志物联合用于诊断肝癌的敏感度较单个标志物诊断时有所提高,但特异度无明显提高。单个标志物用于诊断肝癌时,PIVKA-Ⅱ的诊断比值比(DOR)最高,为22(95%CI:13~36),其次是GPC-3和AFP;两个标志物联合用于诊断肝癌的DOR均高于单个标志物,其中AFP联合GPC-3诊断的DOR最高,为25(95%CI:9~67);三个标志物联合用于诊断肝癌时的DOR明显降低,为10(95%CI:7~45)。结论:单个标志物用于肝癌诊断时,PIVKA-Ⅱ的诊断价值更高。两种标志物联合能显著提高肝癌诊断的敏感度,三种标志物联合未能进一步提高诊断价值。结合临床实际,推荐AFP联合PIVKA-Ⅱ用于肝癌的诊断。展开更多
Objective To investigate the role of cytoplasmic domain of integrin alphaⅡb in platelet signal transduction. Methods Binding capacity of integrin alphaⅡb R995A to antibody platelet activation complex-1 (PAC-1) and p...Objective To investigate the role of cytoplasmic domain of integrin alphaⅡb in platelet signal transduction. Methods Binding capacity of integrin alphaⅡb R995A to antibody platelet activation complex-1 (PAC-1) and pp125 focal adhesion kinase (FAK) phosphorylation of cells were detected by flow cytometry, immune precipitation, and Western blotting. Results Without activation, wild-type alphaⅡbbeta3 Chinese hamster ovary (CHO) cells failed to bind to PAC-1, but mutant chimera alphaⅡb R995A beta3 CHO cells were able to bind with PAC-1. Furthermore, phosphorylation of pp125 (FAK) in wild-type alphaⅡbbeta3 CHO cells occured only when cells were adhered to fibrinogen, but could not be detected in bovine serum albumin suspension. However in the mutant chimera group, it could be detected in both conditions. Conclusion The mutation in integrin alphaⅡb R995A alters its affinity state as a receptor, thus also mediating cytoplasmic signal transduction leading to the phosphorylation of pp125 (FAK) without ligand binding.展开更多
Background:TopoisomeraseⅡalpha(TOP2A)has been reported to play a crucial role in the tumorigenesis of various cancer types.However,the biological role of TOP2A in gallbladder cancer(GBC)remains unknown.The current st...Background:TopoisomeraseⅡalpha(TOP2A)has been reported to play a crucial role in the tumorigenesis of various cancer types.However,the biological role of TOP2A in gallbladder cancer(GBC)remains unknown.The current study aimed to explore the function and potential mechanism of TOP2A in GBC.Methods:Based on Gene Expression Profiling Interactive Analysis data,we found TOP2A was significantly up-regulated in GBC tissues and resulting in shorter overall survival.Quantitative real-time polymerase chain reaction and immunohistochemistry were conducted to detect the expression of TOP2A in 45 pairs of GBC tissues and adjacent non-tumor tissues.In vitro,cell proliferation,migration,and invasion ability were examined by cell counting kit-8 and transwell assay,respectively.Epithelial-mesenchymal transition(EMT)related and phosphatidylinositol 3-kinase/protein kinase B/mammalian target of rapamycin(PI3K/Akt/mTOR)pathway-related markers were measured by Western blotting.Xenograft model assay was performed to evaluate the effect of TOP2A in vivo.Results:TOP2A was found up-regulated in GBC(tumor vs.normal,12.62 vs.0.34)and correlated with the late tumor node metastasis stage(P=0.0032),present of lymph node metastasis(P=0.0273),and poor prognosis in GBC patients(log-rank P=0.028).In vitro and in vivo assays showed that knockdown of TOP2A notably inhibited cell proliferation,migration,invasion,EMT process,and tumor growth in GBC.In addition,TOP2A down-regulation significantly decreased the protein levels of phosphor(p)-PI3K,p-Akt,and p-mTOR.Conclusion:Our study demonstrates that TOP2A was overexpressed in GBC and associated with poor prognosis in GBC patients.TOP2A promotes GBC cell proliferation,migration,invasion,EMT process,and tumor growth through activating PI3K/Akt/mTOR signaling pathway,and may serve as a novel prognostic biomarker and therapeutic target for GBC.展开更多
文摘Objective To investigate the role of cytoplasmic domain of integrin alphaⅡb in platelet signal transduction. Methods Binding capacity of integrin alphaⅡb R995A to antibody platelet activation complex-1 (PAC-1) and pp125 focal adhesion kinase (FAK) phosphorylation of cells were detected by flow cytometry, immune precipitation, and Western blotting. Results Without activation, wild-type alphaⅡbbeta3 Chinese hamster ovary (CHO) cells failed to bind to PAC-1, but mutant chimera alphaⅡb R995A beta3 CHO cells were able to bind with PAC-1. Furthermore, phosphorylation of pp125 (FAK) in wild-type alphaⅡbbeta3 CHO cells occured only when cells were adhered to fibrinogen, but could not be detected in bovine serum albumin suspension. However in the mutant chimera group, it could be detected in both conditions. Conclusion The mutation in integrin alphaⅡb R995A alters its affinity state as a receptor, thus also mediating cytoplasmic signal transduction leading to the phosphorylation of pp125 (FAK) without ligand binding.
文摘Background:TopoisomeraseⅡalpha(TOP2A)has been reported to play a crucial role in the tumorigenesis of various cancer types.However,the biological role of TOP2A in gallbladder cancer(GBC)remains unknown.The current study aimed to explore the function and potential mechanism of TOP2A in GBC.Methods:Based on Gene Expression Profiling Interactive Analysis data,we found TOP2A was significantly up-regulated in GBC tissues and resulting in shorter overall survival.Quantitative real-time polymerase chain reaction and immunohistochemistry were conducted to detect the expression of TOP2A in 45 pairs of GBC tissues and adjacent non-tumor tissues.In vitro,cell proliferation,migration,and invasion ability were examined by cell counting kit-8 and transwell assay,respectively.Epithelial-mesenchymal transition(EMT)related and phosphatidylinositol 3-kinase/protein kinase B/mammalian target of rapamycin(PI3K/Akt/mTOR)pathway-related markers were measured by Western blotting.Xenograft model assay was performed to evaluate the effect of TOP2A in vivo.Results:TOP2A was found up-regulated in GBC(tumor vs.normal,12.62 vs.0.34)and correlated with the late tumor node metastasis stage(P=0.0032),present of lymph node metastasis(P=0.0273),and poor prognosis in GBC patients(log-rank P=0.028).In vitro and in vivo assays showed that knockdown of TOP2A notably inhibited cell proliferation,migration,invasion,EMT process,and tumor growth in GBC.In addition,TOP2A down-regulation significantly decreased the protein levels of phosphor(p)-PI3K,p-Akt,and p-mTOR.Conclusion:Our study demonstrates that TOP2A was overexpressed in GBC and associated with poor prognosis in GBC patients.TOP2A promotes GBC cell proliferation,migration,invasion,EMT process,and tumor growth through activating PI3K/Akt/mTOR signaling pathway,and may serve as a novel prognostic biomarker and therapeutic target for GBC.
