目的研究Plectin的表达与肝癌细胞迁移能力的关系,揭示Plectin表达影响肝癌细胞迁移行为的分子机理。方法首先,Western blot检测正常肝细胞和肝癌细胞中Plectin的表达。其次,构建Plectin下调的肝癌细胞株,设立对照组(shNC组)和shPLEC组...目的研究Plectin的表达与肝癌细胞迁移能力的关系,揭示Plectin表达影响肝癌细胞迁移行为的分子机理。方法首先,Western blot检测正常肝细胞和肝癌细胞中Plectin的表达。其次,构建Plectin下调的肝癌细胞株,设立对照组(shNC组)和shPLEC组,各组分别设溶剂对照组(shNC+DMSO组或shPLEC+DMSO组)和F-actin骨架聚合诱导剂Jasplakinolide组(shNC+Jasp组或shPLEC+Jasp组)。采用Western blot检测各组肝癌细胞中Plectin的表达及上皮-间质转化(epithelial-mesenchymal transition,EMT)相关分子(N-cadherin、vimentin和E-cadherin)的表达;采用Transwell小室法分析肝癌细胞的迁移能力;采用KEGG(Kyoto Encyclopedia of Genes and Genomes)分析与Plectin基因有关的信号通路;采用免疫荧光技术检测Plectin表达变化对细胞骨架F-actin聚合的影响。结果与正常肝细胞相比,Plectin在肝癌细胞中高表达。与shNC组相比,shPLEC组Plectin的表达降低(P<0.05),肝癌细胞的迁移能力减弱(P<0.05),EMT进程被抑制(N-cadherin和vimentin表达降低,E-cadherin表达升高)(P<0.05);KEGG分析发现细胞骨架F-actin调控与Plectin的联系最为密切,shPLEC组肝癌细胞骨架F-actin发生解聚。采用F-actin骨架聚合诱导剂Jasplakinolide处理后,与shPLEC+DMSO组相比,shPLEC+Jasp组肝癌细胞迁移能力增强(P<0.05),EMT进程有所恢复(N-cadherin和vimentin表达升高,E-cadherin表达降低)(P<0.05),同时肝癌细胞骨架F-actin聚合亦有所恢复。结论Plectin在肝癌细胞中高表达,肝癌细胞中Plectin通过诱导F-actin聚合促进肝癌细胞的迁移和EMT。展开更多
In basal squamous cells, plectin-1 interacts with intermediate filaments, whereas trichohyalin, which is distributed primarily in the medulla and inner root sheath cells of human hair follicles, plays a role in streng...In basal squamous cells, plectin-1 interacts with intermediate filaments, whereas trichohyalin, which is distributed primarily in the medulla and inner root sheath cells of human hair follicles, plays a role in strengthening cells during keratinization. Although both cytoskeletal proteins occur in trace amounts in human tongue epithelial cells, there are minimal data on their expression in human tongue primary cancer cells. We therefore investigated the expression of plectin-1 and trichohyalin in human tongue epithelial cell line (DOK) and tongue cancer cell line (BICR31) using western blotting and FITC-labeled immunocytochemistry techniques. DOK and BICR31 cells were cultivated to subconfluence in Dulbecco’s Modified Eagle’s Medium containing 0.4 μg/ml of hydrocortisone and 10% fetal bovine serum, and the levels of trichohyalin and plectin-1 were determined by western blot analysis and immunocytochemical staining. Trichohyalin expression was clearly observed, with no differences between DOK and BICR31 cells. Although DOK cells expressed trace levels of plectin-1, obvious plectin-1 bands were detected in western blot analyses of BICR31 cells. Immunocytochemical staining revealed that trichohyalin and plectin-1 localize in the cytoplasm. Trichohyalin was diffusely distributed in both cell lines, and colocalization of trichohyalin and cytokeratin 1/10 was observed in almost all BICR31 cells. There were no correlations between western blot and immunocytochemical data for trichohyalin. Conversely, correlations in immunochemical reactions for plectin-1 were observed. Most DOK cells showed no localization of plectin-1, but strong reactions were detected in the cytoplasm of BICR31 cells. These results indicate that trichohyalin is expressed by cancerous tongue epithelial cells during various stages of malignancy and that plectin-1 provides an index of malignancy.展开更多
文摘目的研究Plectin的表达与肝癌细胞迁移能力的关系,揭示Plectin表达影响肝癌细胞迁移行为的分子机理。方法首先,Western blot检测正常肝细胞和肝癌细胞中Plectin的表达。其次,构建Plectin下调的肝癌细胞株,设立对照组(shNC组)和shPLEC组,各组分别设溶剂对照组(shNC+DMSO组或shPLEC+DMSO组)和F-actin骨架聚合诱导剂Jasplakinolide组(shNC+Jasp组或shPLEC+Jasp组)。采用Western blot检测各组肝癌细胞中Plectin的表达及上皮-间质转化(epithelial-mesenchymal transition,EMT)相关分子(N-cadherin、vimentin和E-cadherin)的表达;采用Transwell小室法分析肝癌细胞的迁移能力;采用KEGG(Kyoto Encyclopedia of Genes and Genomes)分析与Plectin基因有关的信号通路;采用免疫荧光技术检测Plectin表达变化对细胞骨架F-actin聚合的影响。结果与正常肝细胞相比,Plectin在肝癌细胞中高表达。与shNC组相比,shPLEC组Plectin的表达降低(P<0.05),肝癌细胞的迁移能力减弱(P<0.05),EMT进程被抑制(N-cadherin和vimentin表达降低,E-cadherin表达升高)(P<0.05);KEGG分析发现细胞骨架F-actin调控与Plectin的联系最为密切,shPLEC组肝癌细胞骨架F-actin发生解聚。采用F-actin骨架聚合诱导剂Jasplakinolide处理后,与shPLEC+DMSO组相比,shPLEC+Jasp组肝癌细胞迁移能力增强(P<0.05),EMT进程有所恢复(N-cadherin和vimentin表达升高,E-cadherin表达降低)(P<0.05),同时肝癌细胞骨架F-actin聚合亦有所恢复。结论Plectin在肝癌细胞中高表达,肝癌细胞中Plectin通过诱导F-actin聚合促进肝癌细胞的迁移和EMT。
文摘In basal squamous cells, plectin-1 interacts with intermediate filaments, whereas trichohyalin, which is distributed primarily in the medulla and inner root sheath cells of human hair follicles, plays a role in strengthening cells during keratinization. Although both cytoskeletal proteins occur in trace amounts in human tongue epithelial cells, there are minimal data on their expression in human tongue primary cancer cells. We therefore investigated the expression of plectin-1 and trichohyalin in human tongue epithelial cell line (DOK) and tongue cancer cell line (BICR31) using western blotting and FITC-labeled immunocytochemistry techniques. DOK and BICR31 cells were cultivated to subconfluence in Dulbecco’s Modified Eagle’s Medium containing 0.4 μg/ml of hydrocortisone and 10% fetal bovine serum, and the levels of trichohyalin and plectin-1 were determined by western blot analysis and immunocytochemical staining. Trichohyalin expression was clearly observed, with no differences between DOK and BICR31 cells. Although DOK cells expressed trace levels of plectin-1, obvious plectin-1 bands were detected in western blot analyses of BICR31 cells. Immunocytochemical staining revealed that trichohyalin and plectin-1 localize in the cytoplasm. Trichohyalin was diffusely distributed in both cell lines, and colocalization of trichohyalin and cytokeratin 1/10 was observed in almost all BICR31 cells. There were no correlations between western blot and immunocytochemical data for trichohyalin. Conversely, correlations in immunochemical reactions for plectin-1 were observed. Most DOK cells showed no localization of plectin-1, but strong reactions were detected in the cytoplasm of BICR31 cells. These results indicate that trichohyalin is expressed by cancerous tongue epithelial cells during various stages of malignancy and that plectin-1 provides an index of malignancy.
