In this experiment Toll-like receptor expression pattern in monocytes and monocyte-derived macrophages by lipopolysaccharide （LPS） stimulation was examined. Jugular venous blood was collected from four Japanese calv...In this experiment Toll-like receptor expression pattern in monocytes and monocyte-derived macrophages by lipopolysaccharide （LPS） stimulation was examined. Jugular venous blood was collected from four Japanese calves, and the peripheral blood mononuclear cells （PBMCs） were isolated. The cells were directly used for collecting monocytes by magnetic cell sorting or cultured for 7 days to collect monocyte-derived macrophages in Repcell. Then we analyzed the mRNA expression pattern of TLRs and cytokines in monocytes and monocyte-derived macrophages after LPS stimulation for 24 h. LPS stimulation of both monocytes and monocyte-derived macrophages resulted in an increase in the levels of mRNA transcripts for TNF-α IL-6 and IL-8. Moreover, TNF-α and IL-6 mRNA expressions were significantly augmented by LPS stimulation in monocyte-derived macrophages. TLRs mRNA expressions were unchanged after LPS stimulation of monocytes, while TLRs mRNA expressions in monocyte-derived macrophages were complicated. TLR1, 3, 5, 8 and 10 were significantly decreased after LPS stimulation and there were no differences in the mRNA expressions of TLR2, 4, 6 and 7 between the groups of control and LPS stimulation. Besides, no expression of TLR9 was found. As antigen presenting cells, monocytes and monocyte-derived macrophages respond differently to LPS, so they may have different functions in the innate immune system.展开更多
文摘In this experiment Toll-like receptor expression pattern in monocytes and monocyte-derived macrophages by lipopolysaccharide （LPS） stimulation was examined. Jugular venous blood was collected from four Japanese calves, and the peripheral blood mononuclear cells （PBMCs） were isolated. The cells were directly used for collecting monocytes by magnetic cell sorting or cultured for 7 days to collect monocyte-derived macrophages in Repcell. Then we analyzed the mRNA expression pattern of TLRs and cytokines in monocytes and monocyte-derived macrophages after LPS stimulation for 24 h. LPS stimulation of both monocytes and monocyte-derived macrophages resulted in an increase in the levels of mRNA transcripts for TNF-α IL-6 and IL-8. Moreover, TNF-α and IL-6 mRNA expressions were significantly augmented by LPS stimulation in monocyte-derived macrophages. TLRs mRNA expressions were unchanged after LPS stimulation of monocytes, while TLRs mRNA expressions in monocyte-derived macrophages were complicated. TLR1, 3, 5, 8 and 10 were significantly decreased after LPS stimulation and there were no differences in the mRNA expressions of TLR2, 4, 6 and 7 between the groups of control and LPS stimulation. Besides, no expression of TLR9 was found. As antigen presenting cells, monocytes and monocyte-derived macrophages respond differently to LPS, so they may have different functions in the innate immune system.
文摘[目的]观察煤尘通过单核细胞源性巨噬细胞致人胚肺成纤维细胞MRC-5纤维化改变过程中,胸腺分化抗原-1(Thy-1)表达及其DNA甲基化变化。[方法]用含500 nmol/L佛波酯的1640培养液培养人单核细胞,24 h诱导分化后成巨噬细胞;收集100μg/m L煤尘刺激巨噬细胞24 h的培养上清,再刺激MRC-5 24、48、72 h,对照组分别为正常巨噬细胞和正常人胚肺成纤维细胞。酶联免疫分析法测定巨噬细胞上清液中IL-6、TGF-β1蛋白表达水平和MRC-5中TGF-β1蛋白表达水平,实时荧光定量PCR法检测胶原蛋白-I、胶原蛋白-III、α-SMA、Thy-1、DNA甲基化转移酶(DNMTs)1、3a、3b m RNA的表达,巢式降落式特异性PCR检测Thy-1DNA甲基化。[结果]煤尘组巨噬细胞上清中IL-6、TGF-β1蛋白表达水平与对照组比较明显增加[(5.542±0.953)ng/m Lvs(2.498±0.456)ng/m L,(462.435±56.620)ng/L vs(329.971±17.911)ng/L](P<0.05);巨噬细胞染尘后上清刺激MRC-5 24、48、72 h,TGF-β1蛋白表达[(223.813±5.723),(263.757±17.254),(326.720±11.263)ng/L]和胶原蛋白I m RNA表达(3.38±0.37,3.87±0.28,4.40±0.10)、胶原蛋白III m RNA表达(1.65±0.12,2.37±0.19,2.66±0.28)、α-SMA m RNA表达(2.41±0.47,4.76±0.10,4.23±0.63)均升高;且均存在时间效应关系,r值分别为0.965,0.876,0.899,0.667(P<0.05);煤尘组MRC-5中Thy-1m RNA表达均低于对照组,随着巨噬上清液作用时间的增加,其表达逐渐降低(0.634±0.014,0.448±0.055,0.352±0.044),呈负相关(r=-0.945,P<0.05);煤尘组MRC-5中DNMTs m RNA表达均较对照组升高(DNMT1:1.57±0.12,2.51±0.33,7.00±0.71;DNMT3a:0.74±0.09,2.89±0.52,3.31±0.53;DNMT3b:1.46±0.18,2.25±0.44,5.33±0.16),且均存在时间效应关系,r值分别为0.924,0.890,0.937(P<0.05);煤尘组Thy-1 DNA甲基化水平较对照组升高(0.506±0.014,0.536±0.017,0.570±0.032),存在时间效应关系(r=0.682,P<0.05)。[结论]煤尘通过单核细胞源性巨噬细胞致人胚肺成纤维细胞纤维化发生,在此过程中Thy-1 DNA发生甲基�
