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研究[1]表明,长期吸入大气细颗粒物(particulate matters,PM)与人类心血管疾病、肺部疾病的发生及非传染性疾病的死亡率呈正相关关系。2012年WHO研究表明,空气污染是世界范围内死亡率及致残率的主要原因之一,每年约有370万的过早死亡与空气污染有密切关系[2]。PM2.5是指大气中空气动力学当量直径小于或等于2.5 μm的细颗粒物。因其表面能够吸附各种有毒有害物质,在空气中停留时间长,对人体健康的影响更大。PM2.5经呼吸系统进入人体后,由肺泡巨噬细胞通过Toll样受体(TLRs)识别、吞噬,激活氧化反应、炎症反应及自噬凋亡等[3-5]。本研究对来自美国和中国不同地区的PM2.5对THP1巨噬细胞TLR4表达及氧化应激水平的可能影响进行初步探讨。现作报道。
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低浓度(50 μg/mL)PM2.5刺激24 h后,北京地区和巴尔的摩地区组细胞TLR4表达率均较阴性对照组(50 μL PBS)升高(P < 0.05);高浓度(200 μg/mL)PM2.5刺激24 h后,两地区组细胞TLR4表达率均较阴性对照组和低浓度组降低(P < 0.05)。北京地区与巴尔的摩地区同浓度PM2.5组TLR4表达率之间差异均无统计学意义(P>0.05)(见表 1)。
PM2.5浓度/(μg/mL) 北京地区/% 巴尔的摩地区/% t P 0 22.63±0.57 22.63±0.57 0.00 > 0.05 50 26.27±4.41* 24.37±0.57* 0.74 > 0.05 200 20.97±0.96*# 17.67±2.01*# 2.57 > 0.05 F 14.16 23.16 — — P < 0.01 < 0.01 — — MS组内 69.323 36.286 — — q检验:与PM2.5浓度0组比较* P < 0.05;与PM2.5浓度50 μg/mL组比较# P < 0.05 表 1 两地区不同浓度PM2.5刺激24 h后巨噬细胞TLR4的表达率比较(n=3;x±s)
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低浓度PM2.5刺激24 h后,北京地区和巴尔的摩地区组细胞内ROS水平均高于阴性对照组(P < 0.05),且巴尔的摩地区细胞内ROS水平明显高于北京地区组(P < 0.01)。高浓度PM2.5刺激24 h后,北京地区组细胞内ROS水平均低于阴性对照组和低浓度组(P < 0.05),而巴尔的摩地区组高于阴性对照组(P < 0.05),且巴尔的摩地区细胞内ROS水平明显高于北京地区组(P < 0.01)(见表 2)。
PM2.5浓度/(μg/mL) 北京地区 巴尔的摩地区 t P 0 274.33±3.07 274.33±3.07 0.00 > 0.05 50 321.00±4.34* 386.67±5.63* 16.01 < 0.01 200 224.00±7.86*# 337.33±9.50*# 15.92 < 0.01 F 13.43 23.16 — — P < 0.01 < 0.01 — MS组内 6 823 9 297 — — q检验:与PM2.5浓度0组比较* P < 0.05;与PM2.5浓度50 μg/mL组比较# P < 0.05 表 2 两地区不同浓度PM2.5刺激24 h后巨噬细胞ROS产生情况比较(n=3;x±s)
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北京地区和美国巴尔的摩地区50 μg/mL PM2.5刺激24 h后,细胞Nrf2 mRNA的2-△△CT值与内参β-actin的比值,均较对照组升高(1.9 vs 1.0,0.9 vs 1.0,n=3,P < 0.05);而两地区200 μg/mL PM2.5刺激24 h后,细胞Nrf2 mRNA的2-△△CT值与内参β-actin比值,均较对照组降低(1.9 vs 1.0及0.9 vs 1.0,n=3,P < 0.05)。
PM2.5对THP1巨噬细胞TLR4表达及氧化应激水平的影响
Effect of PM2.5 on the TLR4 expression and oxidative stress levels in THP1 macrophages
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摘要:
目的探讨大气细颗粒物(particulate matters,PM)2.5对THP1巨噬细胞TLR4表达及氧化应激水平的影响。 方法THP1巨噬细胞分别给予来自中国北京、美国巴尔的摩地区的PM2.5刺激24 h,检测巨噬细胞TLR4、Nrf2表达水平,以及细胞内活性氧(ROS)产生水平。 结果与对照组比较,低浓度(50 μg/mL)北京地区和巴尔的摩地区PM2.5刺激24 h后,细胞TLR4、Nrf2表达水平与细胞内ROS产生水平均升高(P < 0.05)。与对照组比较,高浓度(200 μg/mL)北京地区和巴尔的摩地区PM2.5刺激24 h后,细胞TLR4表达水平、Nrf2表达水平均降低(P < 0.05),北京地区组细胞内ROS产生水平降低(P < 0.05),巴尔的摩地区组细胞内ROS升高(P < 0.05)。 结论低浓度PM2.5可促进巨噬细胞TLR4表达,升高氧化应激水平,高浓度PM2.5可降低巨噬细胞TLR4表达,降低氧化应激水平。 Abstract:ObjectiveTo investigate the effects of atmospheric fine particulate matters(PM)2.5 on TLR4 expression and oxidative stress levels in THP1 macrophages. MethodsThe THP1 macrophages from Beijing China and Baltimore United States were stimulated by PM2.5 for 24 h.The expression levels of TLR4 and Nrf2 in macrophages and degree of intracellular reactive oxygen species(ROS) production were detected. ResultsThe expression levels of TLR4 and Nrf2 and degree of intracellular ROS production significantly increased after low concentration(50 μg/mL) PM2.5 from Beijing and Baltimore stimulating for 24h compared with the control group(P < 0.05).Compared with the control group, after the cells were stimulated using high concentration(200μg/mL) PM2.5 from Beijing and Baltimore for 24 h, the expression levels of TLR4 and Nrf2 decreased, the intracellular ROS production in Beijing area decreased(P < 0.05), and the intracellular ROS production in Baltimore increased(P < 0.05). ConclusionsThe low concentration of PM2.5 can promote the expression of TLR4 in macrophages, and increase the level of oxidative stress.The high concentration of PM2.5 can reduce the expression of TLR4 and level of oxidative stress in macrophages. -
Key words:
- macrophage /
- particulate matters 2.5 /
- reactive oxygen species
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表 1 两地区不同浓度PM2.5刺激24 h后巨噬细胞TLR4的表达率比较(n=3;x±s)
PM2.5浓度/(μg/mL) 北京地区/% 巴尔的摩地区/% t P 0 22.63±0.57 22.63±0.57 0.00 > 0.05 50 26.27±4.41* 24.37±0.57* 0.74 > 0.05 200 20.97±0.96*# 17.67±2.01*# 2.57 > 0.05 F 14.16 23.16 — — P < 0.01 < 0.01 — — MS组内 69.323 36.286 — — q检验:与PM2.5浓度0组比较* P < 0.05;与PM2.5浓度50 μg/mL组比较# P < 0.05 表 2 两地区不同浓度PM2.5刺激24 h后巨噬细胞ROS产生情况比较(n=3;x±s)
PM2.5浓度/(μg/mL) 北京地区 巴尔的摩地区 t P 0 274.33±3.07 274.33±3.07 0.00 > 0.05 50 321.00±4.34* 386.67±5.63* 16.01 < 0.01 200 224.00±7.86*# 337.33±9.50*# 15.92 < 0.01 F 13.43 23.16 — — P < 0.01 < 0.01 — MS组内 6 823 9 297 — — q检验:与PM2.5浓度0组比较* P < 0.05;与PM2.5浓度50 μg/mL组比较# P < 0.05 -
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