GSDMB调控肠上皮细胞命运的分子机制初探  

The molecular mechanism of GSDMB regulating the fate of intestinal epithelial cells

作　　者：杨军 邓争瑞 李懿 吴森 郭坤 龚文斌 YANG Jun;DENG Zhengrui;LI Yi;WU Sen;GUO Kun;GONG Wenbin(Department of General Surgery,408 Hospital,Xianyang 713100;Department of General Surgery,The First Affiliated Hospital of University of Science and Technology of China,Hefei 230001;Department of General Surgery,The First Affiliated Hospital of Xi'an Jiaotong University,Xi’an 710061,China)

机构地区：[1]四○八医院普通外科,陕西咸阳713100 [2]中国科学技术大学附属第一医院安徽省立医院普通外科,安徽合肥230001 [3]西安交通大学第一附属医院普通外科,陕西西安710061

出　　处：《西安交通大学学报（医学版）》2024年第3期411-418,共8页Journal of Xi’an Jiaotong University（Medical Sciences）

基　　金：国家自然科学基金资助项目(No.82300594);西安交通大学第一附属医院科研发展基金项目(No.2022QN-07)。

摘　　要：目的初步探讨Gasdermin B(GSDMB)调控肠上皮细胞命运的分子机制。方法过表达人GSDMB质粒到两种人肠上皮细胞系(NCM460和HT-29细胞)和人结肠类器官中,采用免疫印迹法(Western blotting)检测电转效率,并利用细胞计数试剂盒(CCK8),流式细胞术检测细胞凋亡和细胞周期以分析GSDMB过表达对细胞功能的影响。转录组测序分析GSDMB的下游效应分子。组间数据比较采用t检验。结果成功重构两种肠上皮细胞系GSDMB蛋白过表达,过表达GSDMB蛋白的人肠上皮细胞吸光度值(A)[NCM460细胞:(1.17±0.01);HT-29细胞:(0.96±0.06)]明显低于空白对照组[NCM460细胞:(1.67±0.12);HT-29细胞:(1.24±0.07)],差异有统计学意义(t=7.24、5.46,P<0.05);GSDMB过表达组细胞凋亡数目[NCM460细胞:(12.03±1.55);HT-29细胞:(29.30±4.48)]显著多于空白对照组[NCM460细胞:(4.96±1.74);HT-29细胞:(6.95±3.42)],差异有统计学意义(t=5.26、6.97,P<0.05);细胞周期分析显示,GSDMB过表达组细胞G0/G1期比例[NCM460细胞:(47.98±5.28)%;HT-29细胞:(38.04±3.45)%]明显低于空白对照组[NCM460细胞:(59.54±3.90)%;HT-29细胞:(63.81±1.76)%],差异有统计学意义(t=3.05、11.53,P<0.05)。转录组测序结果发现,双特异性磷酸酶4和6(DUSP4和DUSP6)基因在肠上皮细胞表达GSDMB蛋白后显著上调,荧光定量PCR结果证实肠上皮细胞转染GSDMB后DUSP4(2.45±0.15)和DUSP6(4.34±0.22)相对表达水平显著高于对照组(1.06±0.05和1.01±0.02),差异有统计学意义(t=15.08、26.52,P<0.05)。使用DUSP抑制剂BCI处理重构GSDMB表达的NCM460细胞,发现BCI处理组p-ERK表达水平相对于对照组显著升高[(1.14±0.17)vs.(0.58±0.12)],差异有统计学意义(t=5.42,P=0.002),且BCI处理组细胞A值(1.84±0.07)和G0/G1期比例(59.83±2.17)%高于未处理组[(1.52±0.10)和(52.10±2.23)%],BCI处理组细胞凋亡数目(7.60±0.56)明显少于未处理组(12.57±1.00),差异均有统计学意义(t=4.71、4.31、7.52,P<0.05)。过表达GSDMB后的人结肠Objective To explore the molecular mechanism of Gasdermin B(GSDMB)regulating the fate of intestinal epithelial cells.Methods The human GSDMB plasmid was overexpressed into two human intestinal epithelial cell lines(NCM460 and HT-29 cells)and human colon-derived organoids.Western blotting was used to confirm the efficiency of electroporation.Cell counting kit(CCK8),cell apoptosis,and cell cycle by flow cytometry were performed to analyze the effect of GSDMB overexpression on cell function.Transcriptome sequencing was used to analyze the downstream effector molecules of GSDMB.T test was used to compare the data between the two groups.Results The overexpression of GSDMB protein in the two intestinal epithelial cell lines was successfully reconstructed.The absorbance value(A)of human intestinal epithelial cells overexpressing GSDMB protein[NCM460 cells:(1.17±0.01),HT-29 cells:(0.96±0.06)]was significantly lower than that of blank control cells[NCM460 cells:(1.67±0.12),HT-29 cells:(1.24±0.07)](t=7.24 and 5.46,P<0.05).The number of apoptotic cells in the GSDMB overexpression group[NCM460 cells:(12.03±1.55),HT-29 cells:(29.30±4.48)]was significantly higher than that in the blank group[NCM460 cells:(4.96±1.74),HT-29 cells:(6.95±3.42)](t=5.26 and 6.97,P<0.05).Cell cycle analysis showed that the ratio of cells at G0/G1 phase in the GSDMB overexpression group[NCM460 cells:(47.98±5.28)%,HT-29 cells:(38.04±3.45)%]was significantly lower than that in the control group[NCM460 cells:(59.54±3.90)%,HT-29 cells:(63.81±1.76)%](t=3.05 and 11.53,P<0.05).Transcriptome sequencing results showed that the dual specificity phosphatase 4 and 6(DUSP4 and DUSP6)genes were significantly upregulated after GSDMB protein expression.Fluorescence quantitative PCR results confirmed that the relative expression levels of DUSP4(2.45±0.15)and DUSP6(4.34±0.22)in intestinal epithelial cells transfected with GSDMB were significantly higher than those in the control group(1.06±0.05 and 1.01±0.02)(t=15.08 and 26.52,P<0.05).After GSDMB-expres

关 键 词：肠上皮细胞 Gasdermin B(GSDMB) 细胞凋亡 细胞周期 

分 类 号：R333[医药卫生—人体生理学]