高表达HMGB1肺癌细胞系的筛选及意义

Screening of Highly-expressed-HMGB1-Gene Human Lung Cancer Cell Lines

背景与目的在人肺鳞癌细胞株YTMLC-9、人肺腺癌细胞株A549、人大细胞肺癌细胞株L9981及人小细胞癌细胞株NCI-H446中筛选高表达HMGB1的细胞株,作为人肺癌细胞HMGB1基因研究的理想材料。方法采用实时荧光定量PCR和Western blot方法对人肺癌细胞HMGB1基因在4株细胞中的mRNA和蛋白水平的表达进行检测,筛选出高表达HMGB1基因的人肺癌细胞株。结果人肺鳞癌细胞株YTMLC-9、人肺腺癌细胞株A549、人大细胞肺癌细胞株L9981及人小细胞癌细胞株NCI-H446中均有HMGB1基因表达,其中人大细胞肺癌细胞株L9981表达水平最高,mRNA是表达量最低的人肺腺癌细胞株A549mRNA表达量的10.3倍;人大细胞肺癌细胞株L9981HMGB1蛋白表达水平最高,与其它3种人肺癌细胞株相比有统计学差异(P<0.001)。结论人大细胞肺癌L9981细胞株为HMGB1高表达细胞株,可作为进行肺癌细胞中研究HMGB1的实验材料。

Background and objective Lung cancer is a type of malignant tumor which threats human health and life. Its morbidity might increase dramatically in a long period. Lung cancer is the leading cause of cancer-related death all over the world. HMGB1 （high mobility group box B 1） is a non-histone chromosome binding protein in the cells. It takes part in many biological processes including genes transcription and DNA repair. HMGB1 overexpression can result in cell apoptosis, differentiation, migration and proliferation, The main purpose of this study was to detect the HMGB 1 expression of 4 lung cancer cell lines in order to select the most suitable cell line to do the work next step. Methods Four lung cancer cell lines were cultured by normal method, Western blot and real-time quantitative PCR were used to verify the levels of expression of HMGB 1. The cell line which HMGB1 over-expressed was selected. Results HMGB1 expressed in all 4 lung cancer cell lines, the cell line L9981 was the most highly expressed cell line （P〈0.001）. Conclusion All 4 lung cancer cell lines expree HMGB1 gene. As the HMGB1 overexpression cell line, L9981 is an ideal material for follow-up research.