Objective:To explore the role of polycystic kidney and hepatic disease 1-like 1(PKHD1L1)in lung adenocarcinoma(LUAD).Methods:Bioinformatics tools were utilized to examine the clinical profile of PKHD1L1 and chromobox ...Objective:To explore the role of polycystic kidney and hepatic disease 1-like 1(PKHD1L1)in lung adenocarcinoma(LUAD).Methods:Bioinformatics tools were utilized to examine the clinical profile of PKHD1L1 and chromobox protein homolog 7(CBX7)in LUAD.The Cell Counting Kit-8,colony formation,terminal deoxynucleotidyl transferase dUTP nick end labeling,Transwell,and wound-healing assays were carried out to assess the proliferative,apoptotic,invasive,and migrative capacities of the cells.Furthermore,the interrelation between PKHD1L1 and CBX7 was validated using a co-immunoprecipitation assay.A LUAD mice model was constructed by subcutaneous injection of A549 cells.Finally,immunohistochemical staining was performed to evaluate CBX7 and Ki67 expression.Results:PKHD1L1 was downregulated in LUAD and predicted dismal outcomes in patients with LUAD.PKHD1L1 upregulation repressed the proliferative,invasive,and migrative capabilities of A549 cells and exacerbated the apoptotic rate.Additionally,PKHD1L1 may bind to CBX7 and positively modulate CBX7 expression.CBX7 deletion partly abrogated the effects of PKHD1L1 upregulation on the cellular biological activities in A549 cells.Furthermore,the PKHD1L1/CBX7 axis regulates the Hippo signaling pathway in A549 cells.PKHD1L1 restricted tumor growth in LUAD xenograft mice;this was partly abolished by CBX7 knockdown.Conclusion:PKHD1L1 can hinder LUAD progression by regulating CBX7-mediated Hippo signaling.展开更多
本实验通过构建人源色素框同源蛋白7(chromobox protein homolog 7,CBX7)全长及部分片段的大肠杆菌pp SUMO表达载体,经过Ni柱亲和纯化、离子交换纯化以及分子筛纯化等方法,获得较纯的CBX7(Full-Length)蛋白及达到蛋白质结晶条件的CBX7(1...本实验通过构建人源色素框同源蛋白7(chromobox protein homolog 7,CBX7)全长及部分片段的大肠杆菌pp SUMO表达载体,经过Ni柱亲和纯化、离子交换纯化以及分子筛纯化等方法,获得较纯的CBX7(Full-Length)蛋白及达到蛋白质结晶条件的CBX7(13-65aa)蛋白。证实了人源CBX7中间区域存在大量疏水基团,该区域对CBX7蛋白的稳定性有一定影响。人源CBX7蛋白质的纯化及疏水区域的发现为后续相关结构及功能的研究提供了途径。展开更多
Gastrokine 1 (GKN1) is a highly secreted gastric mucosal protein in normal individuals but strongly down-regulated or totally absent in gastric cancer subjects. An epigenetic mechanism might be responsible for GKN1 ge...Gastrokine 1 (GKN1) is a highly secreted gastric mucosal protein in normal individuals but strongly down-regulated or totally absent in gastric cancer subjects. An epigenetic mechanism might be responsible for GKN1 gene silencing probably through the activity of a transcription factor in association with the enzymes SUV39H1 and HDACs on the GKN1 promoter. In fact, compared to non-tumor tissues, a high increase of H3K9me3 level was observed in the corresponding tumor ones. Because H3K4me3 seems to be a possible epigenetic mark for active euchromatin, we try to verify the H3K4me3 level on the GKN1 promoter in gastric cancer tumor specimens. In addition, we also attempt to highlight if CBX7 could be the possible regulatory transcription factor correlated to GKN1 gene promoter. Therefore, we evaluated if the CBX7 expression levels could be associated with GKN1 down-regulation in gastric cancer. To this purpose, 2 pairs of non-tumor and tumor surgical specimens from patients with gastric cancer were analyzed for H3K4me3 by chromatin immunoprecipitation (ChiP) assays, and 9 pairs were instead analyzed by Western blotting for GKN1, and CBX7 expression levels, respectively. The results suggested that the observed increase of H3K4me3 in tumor samples was not in agreement with its proposed function whereas the expression of CBX7 was not associated with the down-regulation of GKN1. In particular, the expression levels of CBX7 in tumor samples might suggest a survival role in gastric cancer.展开更多
基金supported by Major Clinical Research Projects of Shanghai Tenth Clinical Medical College of Nanjing Medical University(SHDC2020CR3068B).
文摘Objective:To explore the role of polycystic kidney and hepatic disease 1-like 1(PKHD1L1)in lung adenocarcinoma(LUAD).Methods:Bioinformatics tools were utilized to examine the clinical profile of PKHD1L1 and chromobox protein homolog 7(CBX7)in LUAD.The Cell Counting Kit-8,colony formation,terminal deoxynucleotidyl transferase dUTP nick end labeling,Transwell,and wound-healing assays were carried out to assess the proliferative,apoptotic,invasive,and migrative capacities of the cells.Furthermore,the interrelation between PKHD1L1 and CBX7 was validated using a co-immunoprecipitation assay.A LUAD mice model was constructed by subcutaneous injection of A549 cells.Finally,immunohistochemical staining was performed to evaluate CBX7 and Ki67 expression.Results:PKHD1L1 was downregulated in LUAD and predicted dismal outcomes in patients with LUAD.PKHD1L1 upregulation repressed the proliferative,invasive,and migrative capabilities of A549 cells and exacerbated the apoptotic rate.Additionally,PKHD1L1 may bind to CBX7 and positively modulate CBX7 expression.CBX7 deletion partly abrogated the effects of PKHD1L1 upregulation on the cellular biological activities in A549 cells.Furthermore,the PKHD1L1/CBX7 axis regulates the Hippo signaling pathway in A549 cells.PKHD1L1 restricted tumor growth in LUAD xenograft mice;this was partly abolished by CBX7 knockdown.Conclusion:PKHD1L1 can hinder LUAD progression by regulating CBX7-mediated Hippo signaling.
文摘本实验通过构建人源色素框同源蛋白7(chromobox protein homolog 7,CBX7)全长及部分片段的大肠杆菌pp SUMO表达载体,经过Ni柱亲和纯化、离子交换纯化以及分子筛纯化等方法,获得较纯的CBX7(Full-Length)蛋白及达到蛋白质结晶条件的CBX7(13-65aa)蛋白。证实了人源CBX7中间区域存在大量疏水基团,该区域对CBX7蛋白的稳定性有一定影响。人源CBX7蛋白质的纯化及疏水区域的发现为后续相关结构及功能的研究提供了途径。
文摘Gastrokine 1 (GKN1) is a highly secreted gastric mucosal protein in normal individuals but strongly down-regulated or totally absent in gastric cancer subjects. An epigenetic mechanism might be responsible for GKN1 gene silencing probably through the activity of a transcription factor in association with the enzymes SUV39H1 and HDACs on the GKN1 promoter. In fact, compared to non-tumor tissues, a high increase of H3K9me3 level was observed in the corresponding tumor ones. Because H3K4me3 seems to be a possible epigenetic mark for active euchromatin, we try to verify the H3K4me3 level on the GKN1 promoter in gastric cancer tumor specimens. In addition, we also attempt to highlight if CBX7 could be the possible regulatory transcription factor correlated to GKN1 gene promoter. Therefore, we evaluated if the CBX7 expression levels could be associated with GKN1 down-regulation in gastric cancer. To this purpose, 2 pairs of non-tumor and tumor surgical specimens from patients with gastric cancer were analyzed for H3K4me3 by chromatin immunoprecipitation (ChiP) assays, and 9 pairs were instead analyzed by Western blotting for GKN1, and CBX7 expression levels, respectively. The results suggested that the observed increase of H3K4me3 in tumor samples was not in agreement with its proposed function whereas the expression of CBX7 was not associated with the down-regulation of GKN1. In particular, the expression levels of CBX7 in tumor samples might suggest a survival role in gastric cancer.
