Hydroxylated multi-walled carbon nanotubes(h-MWCNTs) and carboxylated MWCNTs(c-MWCNTs)have potential applications in biomedicine, but their toxicity to human endothelial cells under stressed conditions associated with...Hydroxylated multi-walled carbon nanotubes(h-MWCNTs) and carboxylated MWCNTs(c-MWCNTs)have potential applications in biomedicine, but their toxicity to human endothelial cells under stressed conditions associated with chronic diseases was less studied in vitro. This study stressed human umbilical vein endothelial cells(HUVECs) with ER stress inducer thapsigargin(TG), and investigated the toxicity of h-MWCNTs and c-MWCNTs to normal and stressed HUVECs. h-MWCNTs and c-MWCNTs modestly reduced cellular viability, significantly promoted soluble ICAM-1(sICAM-1),soluble VCAM-1(sVCAM-1) as well as intracellular ROS, and decreased the expression of transcription factor KLF2 and KLF4. Pre-treatment with TG significantly reduced cellular viability, promoted IL-6 and THP-1 monocyte adhesion, and increased the expression of a panel of ER stress genes. ANOVA indicated no interaction between MWCNTs and TG pre-treatment on most of the endpoints. It was concluded that the toxicity of h-MWCNTs and c-MWCNTs to HUVECs might not be exacerbated by ER stress展开更多
Kruppel-like factor 4（Klf4） is a zinc finger transcription factor and plays crucial roles in Xenopus embryogenesis.However, its regulation during embryogenesis is still unclear. Here, we report that Tcf711, a key do...Kruppel-like factor 4（Klf4） is a zinc finger transcription factor and plays crucial roles in Xenopus embryogenesis.However, its regulation during embryogenesis is still unclear. Here, we report that Tcf711, a key downstream transducer of the Wnt signaling pathway, could promote Klf4 transcription and stimulate Klf4 promoter activity in early Xenopus embryos. Furthermore, cycloheximide treatment showed a direct effect on Klf4 transcription facilitated by Tcf711. Moreover, the dominant negative form of Tcf711（dnTcf711）, which lacks N-terminus of the β-catenin binding motif, could still activate Klf4 transcription, suggesting that this regulation is Wnt/β-catenin independent.Taken together, our results demonstrate that Tcf711 lies upstream of Klf4 to maintain its expression level during Xenopus embryogenesis.展开更多
目的:探讨体外沉默Kruppel样因子4(Kruppel like factor 4,KLF4)基因的表达对食管癌KYSE140细胞增殖及迁移的影响。方法:Western blotting法检测人食管癌细胞株KYSE140、KYSE150、EC109及EC9706及食管永生化细胞NE3中KLF4蛋白的表达,化...目的:探讨体外沉默Kruppel样因子4(Kruppel like factor 4,KLF4)基因的表达对食管癌KYSE140细胞增殖及迁移的影响。方法:Western blotting法检测人食管癌细胞株KYSE140、KYSE150、EC109及EC9706及食管永生化细胞NE3中KLF4蛋白的表达,化学合成2对靶向KLF4的siRNA(KLF4-siRNA1,KLF4-siRNA2),并设对照siRNA(Ctrl-siRNA),分别体外转染至高表达KLF4的食管癌KYSE140细胞中,形成KLF4-siRNA1-KYSE140、KLF4-siRNA2-KYSE140及Ctrl-siRNA-KYSE140细胞,通过MTT实验、Transwell实验分别检测转染后食管癌KYSE140细胞的增殖及迁移。结果:食管癌细胞株KYSE140中KLF4蛋白的表达明显高于KYSE150、EC109及EC9706细胞株[(5.62±0.02)vs(1.71±0.23)、(3.24±0.35)、(3.16±0.41),均P<0.05]。KLF4-siRNA1-KYSE140、KLF4-siRNA2-KYSE140与Ctrl-siRNA-KYSE140细胞相比,KLF4蛋白表达明显降低[(0.49±0.18)、(0.32±0.09)vs(0.98±0.19),均P<0.05],细胞增殖能力明显增高[(1.2±0.8)、(1.4±0.1)vs(0.6±0.1),均P<0.05],迁移细胞数量也明显增加[(780±22)、(475±25)vs(83±17)个,P<0.05]。结论:KLF4在人食管癌细胞的增殖和迁移过程中起着负调控作用。展开更多
Summary: To investigate the expression of KLF6mRNA in primary hepatocellular carcinoma (HCC), nomal liver tissues and the tissues adjacent to the cancers, reverse-transcription polymerase chain reaction (RT-PCR) was e...Summary: To investigate the expression of KLF6mRNA in primary hepatocellular carcinoma (HCC), nomal liver tissues and the tissues adjacent to the cancers, reverse-transcription polymerase chain reaction (RT-PCR) was employed to investigate the expression of the KLF6 gene in HCC, the corresponding adjacent non-cancerous tissues and normal liver tissue. Our results showed that an amplified fragment of 427 bp DNA was detected in 18 of 19 (94.7 %) adjacent non-cancerous tissues and normal liver tissue, and in 12 (85.7 %) of 14 HCC. There were no significant differences in the levels of KLF6 mRNA between normal liver and liver tumors (P>0.05). It is concluded that KLF6 mRNA is generally expressed in HCC.展开更多
基金financially supported by College Outstanding Young and Middle-aged Innovative Research Team Project of HubeiProvince (No. T201717)the Health and Family Planning Commission Scientific Research Project of Hubei Province (No. WJ2017Z027)
文摘Hydroxylated multi-walled carbon nanotubes(h-MWCNTs) and carboxylated MWCNTs(c-MWCNTs)have potential applications in biomedicine, but their toxicity to human endothelial cells under stressed conditions associated with chronic diseases was less studied in vitro. This study stressed human umbilical vein endothelial cells(HUVECs) with ER stress inducer thapsigargin(TG), and investigated the toxicity of h-MWCNTs and c-MWCNTs to normal and stressed HUVECs. h-MWCNTs and c-MWCNTs modestly reduced cellular viability, significantly promoted soluble ICAM-1(sICAM-1),soluble VCAM-1(sVCAM-1) as well as intracellular ROS, and decreased the expression of transcription factor KLF2 and KLF4. Pre-treatment with TG significantly reduced cellular viability, promoted IL-6 and THP-1 monocyte adhesion, and increased the expression of a panel of ER stress genes. ANOVA indicated no interaction between MWCNTs and TG pre-treatment on most of the endpoints. It was concluded that the toxicity of h-MWCNTs and c-MWCNTs to HUVECs might not be exacerbated by ER stress
基金supported by the Start-up Funding of Henan University of Science and Technology(13480027) to Q. C.the Key Science Foundation of Nanjing Medical University(2015NJMUZD002)+2 种基金the Natural Science Foundation of Higher Education Institutions of Jiangsu Province(16KJB-180020)Natural Science Foundation of Jiangsu Province (BK20171053)National Natural Science Funds of China (81702747) to C.L
文摘Kruppel-like factor 4（Klf4） is a zinc finger transcription factor and plays crucial roles in Xenopus embryogenesis.However, its regulation during embryogenesis is still unclear. Here, we report that Tcf711, a key downstream transducer of the Wnt signaling pathway, could promote Klf4 transcription and stimulate Klf4 promoter activity in early Xenopus embryos. Furthermore, cycloheximide treatment showed a direct effect on Klf4 transcription facilitated by Tcf711. Moreover, the dominant negative form of Tcf711（dnTcf711）, which lacks N-terminus of the β-catenin binding motif, could still activate Klf4 transcription, suggesting that this regulation is Wnt/β-catenin independent.Taken together, our results demonstrate that Tcf711 lies upstream of Klf4 to maintain its expression level during Xenopus embryogenesis.
文摘目的:探讨体外沉默Kruppel样因子4(Kruppel like factor 4,KLF4)基因的表达对食管癌KYSE140细胞增殖及迁移的影响。方法:Western blotting法检测人食管癌细胞株KYSE140、KYSE150、EC109及EC9706及食管永生化细胞NE3中KLF4蛋白的表达,化学合成2对靶向KLF4的siRNA(KLF4-siRNA1,KLF4-siRNA2),并设对照siRNA(Ctrl-siRNA),分别体外转染至高表达KLF4的食管癌KYSE140细胞中,形成KLF4-siRNA1-KYSE140、KLF4-siRNA2-KYSE140及Ctrl-siRNA-KYSE140细胞,通过MTT实验、Transwell实验分别检测转染后食管癌KYSE140细胞的增殖及迁移。结果:食管癌细胞株KYSE140中KLF4蛋白的表达明显高于KYSE150、EC109及EC9706细胞株[(5.62±0.02)vs(1.71±0.23)、(3.24±0.35)、(3.16±0.41),均P<0.05]。KLF4-siRNA1-KYSE140、KLF4-siRNA2-KYSE140与Ctrl-siRNA-KYSE140细胞相比,KLF4蛋白表达明显降低[(0.49±0.18)、(0.32±0.09)vs(0.98±0.19),均P<0.05],细胞增殖能力明显增高[(1.2±0.8)、(1.4±0.1)vs(0.6±0.1),均P<0.05],迁移细胞数量也明显增加[(780±22)、(475±25)vs(83±17)个,P<0.05]。结论:KLF4在人食管癌细胞的增殖和迁移过程中起着负调控作用。
文摘Summary: To investigate the expression of KLF6mRNA in primary hepatocellular carcinoma (HCC), nomal liver tissues and the tissues adjacent to the cancers, reverse-transcription polymerase chain reaction (RT-PCR) was employed to investigate the expression of the KLF6 gene in HCC, the corresponding adjacent non-cancerous tissues and normal liver tissue. Our results showed that an amplified fragment of 427 bp DNA was detected in 18 of 19 (94.7 %) adjacent non-cancerous tissues and normal liver tissue, and in 12 (85.7 %) of 14 HCC. There were no significant differences in the levels of KLF6 mRNA between normal liver and liver tumors (P>0.05). It is concluded that KLF6 mRNA is generally expressed in HCC.
