摘要
目的探讨非受体酪氨酸激酶Tec在内毒素/脂多糖(LPS)诱导人肺泡上皮细胞A549促炎性细胞因子白细胞介素8(IL-8)产生中的作用及机制。方法将人肺泡上皮细胞A549用含体积分数10%胎牛血清的RPMI-1640培养液常规培养传代,取第2或第3代细胞进行后续实验。(1)取细胞,按随机数字表法分为6组,每组4孔。空白对照组细胞常规培养2h;单纯LPS组细胞常规培养1h后加入1μg/mL的LPS刺激1h;单纯LFM-A13组细胞于常规培养液中加入75μmol/L的LFM-A13处理1h后更换培养液常规培养1h;25μmol/LLFM-A13+LPS组、75μmol/LLFM-A13+LPS组、100μmol/LLFM-A13+LPS组细胞分别于常规培养液中加入25、75、100μmol/L的LFM-A13处理1h后,均更换培养液并加入1μg/mL的LPS刺激1h。采用蛋白质印迹法检测各组细胞内Tec的蛋白表达情况,采用酶联免疫吸附测定法检测各组细胞培养上清液中IL-8的含量。(2)取细胞,按随机数字表法分为5组,每组4孔。空白对照组细胞常规培养2h;小干扰RNA(siRNA)对照+LPS组细胞用空的慢病毒转染10h后,于常规培养液中加入1μg/mL的LPS刺激2h;Tecmus-298RNAi+LPS组、Tecmus-299RNAi+LPS组、Tecmus-300RNAi+LPS组细胞分别用搭载Tecmus-298RNAi、Tecmus-299RNAi、Tecmus-300RNAi的慢病毒转染10h后,均于常规培养液中加入1μg/mL的LPS刺激2h。采用蛋白质印迹法检测各组细胞内Tec的蛋白表达情况,筛选沉默Tec基因效果最佳的Tec-siRNA。(3)取细胞,按随机数字表法分为4组,每组4孔。空白对照组细胞常规培养2h;病毒对照组细胞转染空的慢病毒10h后,常规培养2h;单纯LPS组细胞于常规培养液中加入1μg/mL的LPS刺激2h;Tec-siRNA+LPS组细胞转染搭载沉默Tec基因效果最佳的Tec-siRNA的慢病毒10h后,于常规培养液中加入1μg/mL的LPS刺激2h。采用蛋白质印迹法检测各组细胞内p38丝裂原活化蛋白激酶(MAPK)和细胞外信号调节激酶(ERK)MAPK的蛋白表达。对数据行单因素方差分析和LSD-t检验。结果(1)与空白对照组比较,单纯LPS组细胞中Tec蛋白表达明显升高(t=9.72,P<0.05),单纯LFM-A13组细胞中Tec蛋白表达无明显变化(t=4.31,P=0.05)。与单纯LPS组比较,25μmol/LLFM-A13+LPS组、75μmol/LLFM-A13+LPS组、100μmol/LLFM-A13+LPS组细胞中Tec蛋白表达明显降低(t=9.72、9.07、16.33,P<0.05或P<0.01)。与空白对照组的(189±22)pg/mL比较,单纯LPS组细胞培养上清液中IL-8含量明显升高[(214±10)pg/mL,t=2.18,P<0.05],单纯LFM-A13组细胞培养上清液中IL-8含量无明显变化[(173±43)pg/mL,t=0.64,P>0.05]。与单纯LPS组比较,25μmol/LLFM-A13+LPS组细胞培养上清液中IL-8含量无明显变化[(204±38)pg/mL,t=0.54,P>0.05],75μmol/LLFM-A13+LPS组、100μmol/LLFM-A13+LPS组细胞培养上清液中IL-8含量明显降低[(144±44)、(137±51)pg/mL,t=3.63、2.55,P<0.05或P<0.01]。(2)与空白对照组比较,siRNA对照+LPS组细胞中Tec蛋白表达明显升高(t=14.24,P<0.01)。与siRNA对照+LPS组比较,Tecmus-298RNAi+LPS组、Tecmus-299RNAi+LPS组细胞中Tec蛋白表达明显下降(t=36.03、18.23,P<0.01),Tecmus-300RNAi+LPS组细胞中Tec蛋白表达无明显变化(t=4.08,P>0.05)。Tecmus-298RNAi+LPS组细胞中Tec蛋白表达最低,遂将Tecmus-298RNAi用于后续实验。(3)与空白对照组的1.16±0.16、0.78±0.11比较,病毒对照组细胞内p38MAPK和ERKMAPK蛋白表达无明显变化(1.66±0.13、0.89±0.11,t=11.09、3.60,P>0.05),单纯LPS组细胞内p38MAPK和ERKMAPK蛋白表达明显升高(2.83±0.29、1.86±0.37,t=9.70、7.23,P<0.05)。与单纯LPS组比较,Tec-siRNA+LPS组细胞内p38MAPK和ERKMAPK蛋白表达明显下降(0.69±0.16、1.03±0.24,t=13.78、4.12,P<0.05或P<0.01)。结论Tec可能通过p38MAPK、ERKMAPK信号通路介导LPS诱导人肺泡上皮细胞A549促炎性细胞因子IL-8的产生和释放。
Objective To investigate the role and mechanism of nonreceptor tyrosine kinase Tec in the production of pro-inflammatory cytokine interleukin-8 (IL-8) induced by endotoxin/lipopolysaccharide (LPS) in human alveolar epithelial cells A549. Methods Human alveolar epithelial cells A549 were routinely cultured and passaged in Roswell Park Memorial Institute-1640 medium containing 10% fetal bovine serum. The second or third passage of cells were collected for subsequent experiments.(1) Cells were collected and divided into 6 groups with 4 wells in each group according to the random number table. Cells in blank control group were routinely cultured for 2 h. Cells in simple LPS group were routinely cultured for 1 h and then stimulated by 1 μg/mL LPS for 1 h. Cells in simple LFM-A13 group were cultured with conventional culture medium adding 75 μmol/L LFM-A13 for 1 h and then cultured with replaced conventional culture medium for 1 h. Cells in 25 μmol/L LFM-A13+ LPS group, 75 μmol/L LFM-A13+ LPS group, and 100 μmol/L LFM-A13+ LPS group were cultured with conventional culture medium adding 25, 75, and 100 μmol/L LFM-A13 respectively for 1 h and then all stimulated by 1 μg/mL LPS added into the replaced conventional culture medium for 1 h. The protein expression of Tec in cells of each group was detected by Western blotting, and the content of IL-8 in cell culture supernatant of each group was determined by enzyme-linked immunosorbent assay.(2) Cells were collected and divided into 5 groups with 4 wells in each group according to the random number table. Cells in blank control group were routinely cultured for 2 h. Cells in small interfering RNA (siRNA) control+ LPS group were transfected with empty lentivirus for 10 h and then stimulated by 1 μg/mL LPS added into the conventional culture medium for 2 h. Cells in Tec mus-298 RNA interference (RNAi)+ LPS group, Tec mus-299 RNAi+ LPS group, and Tec mus-300 RNAi+ LPS group were transfected with lentivirus loaded with Tec mus-298 RNAi, Tec mus-299 RNAi, and Tec mus-300 RNAi respectively for 10 h and then stimulated by 1 μg/mL LPS added into the conventional culture medium for 2 h. The protein expression of Tec in cells of each group was detected by Western blotting to screen Tec-siRNA with the best silencing effect on Tec gene.(3) Cells were collected and divided into 4 groups with 4 wells in each group according to the random number table. Cells in blank control group were routinely cultured for 2 h. Cells in virus control group were transfected with empty lentivirus for 10 h and then routinely cultured for 2 h. Cells in simple LPS group were stimulated by 1 μg/mL LPS added into the conventional culture medium for 2 h. Cells in Tec-siRNA+ LPS group were transfected with lentivirus loaded with Tec-siRNA with the best silencing effect on Tec gene for 10 h and then stimulated by 1 μg/mL LPS added into the conventional culture medium for 2 h. The protein expressions of p38 mitogen-activated protein kinase (MAPK) and extracellular signal-regulated kinase (ERK) MAPK of cells in each group were detected by Western blotting. Data were processed with one-way analysis of variance and the least significant difference-t test. Results (1) Compared with that of blank control group, the protein expression of Tec of cells in simple LPS group was obviously increased (t=9.72, P<0.05), but the protein expression of Tec of cells in simple LFM-A13 group was not obviously changed (t=4.31, P=0.05). Compared with that of simple LPS group, the protein expression of Tec of cells in 25 μmol/L LFM-A13+ LPS group, 75 μmol/L LFM-A13+ LPS group, or 100 μmol/L LFM-A13+ LPS group was obviously decreased (t=9.72, 9.07, 16.33, P<0.05 or P<0.01). Compared with (189±22) pg/mL of blank control group, the content of IL-8 in culture supernatant of cells in simple LPS group was obviously increased [(214±10) pg/mL, t=2.18, P<0.05], but the content of IL-8 in culture supernatant of cells in simple LFM-A13 group was not obviously changed [(173±43) pg/mL, t=0.64, P>0.05]. Compared with that of simple LPS group, the content of IL-8 in culture supernatant of cells in 25 μmol/L LFM-A13+ LPS group was not obviously changed [(204±38) pg/mL, t=0.54, P>0.05], but the content of IL-8 in culture supernatant of cells in 75 μmol/L LFM-A13+ LPS group and 100 μmol/L LFM-A13+ LPS group was obviously decreased [(144±44),(137±51) pg/mL, t=3.63, 2.55, P<0.05 or P<0.01].(2) Compared with that of blank control group, the protein expression of Tec of cells in siRNA control+ LPS group was obviously increased (t=14.24, P<0.01). Compared with that of siRNA control+ LPS group, the protein expression of Tec of cells in Tec mus-298 RNAi+ LPS group or Tec mus-299 RNAi+ LPS group was obviously decreased (t=36.03, 18.23, P<0.01), but the protein expression of Tec of cells in Tec mus-300 RNAi+ LPS group was not obviously changed (t=4.08, P>0.05). The protein expression of Tec was the lowest in cells of Tec mus-298 RNAi+ LPS group, so Tec mus-298 RNAi was used in subsequent experiment.(3) Compared with 1.16±0.16 and 0.78±0.11 of blank control group, the protein expressions of p38 MAPK and ERK MAPK of cells in virus control group were not obviously changed (1.66±0.13, 0.89±0.11, t=11.09, 3.60, P>0.05), but the protein expressions of p38 MAPK and ERK MAPK of cells in simple LPS group were obviously increased (2.83±0.29, 1.86±0.37, t=9.70, 7.23, P<0.05). Compared with those of simple LPS group, the protein expression of p38 MAPK and protein expression of ERK MAPK of cells in Tec-siRNA+ LPS group were obviously decreased (0.69±0.16, 1.03±0.24, t=13.78, 4.12, P<0.05 or P<0.01). Conclusions Tec may mediate the production and release of pro-inflammatory cytokine IL-8 from human alveolar epithelial cells A549 induced by LPS via the p38 MAPK and ERK MAPK signal pathways.
作者
王艺
胡迎
王飞
刘晟
王永杰
陈旭林
Wang Yi;Hu Ying;Wang Fei;Liu Sheng;Wang Yongjie;Chen Xulin(Department of Burns, the First Affiliated Hospital of Anhui Medical University, Hefei 230022, China, is working at the First Affiliated Hospital of Tsinghua University, Beijing 100020, China)
出处
《中华烧伤杂志》
CAS
CSCD
北大核心
2019年第8期580-586,共7页
Chinese Journal of Burns
基金
国家自然科学基金(81671877).