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- 2018
粪肠球菌LTA通过促进ROS的高表达活化NLRP3炎性体
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Abstract:
摘要 目的:检测粪肠球菌脂磷壁酸LTA能否通过激活活性氧而活化NLRP3炎性体。方法:粪肠球菌LTA作用于小鼠巨噬细胞RAW264.7,运用Western blot、ELISA及 Real-time qPCR法检测NLRP3炎性体蛋白及mRNA的表达。还原型烟酰胺腺嘌呤二核苷酸磷酸酶氧化酶抑制剂DPI抑制活性氧(reactive oxygen species,ROS)的产生,荧光染色及流式细胞仪检测ROS的表达。结果:LTA作用于RAW264.7细胞24小时后,NLRP3、Caspase-1、IL-1β蛋白及mRNA的表达量均明显高于阴性对照组(P<0.05)。DPI可有效抑制ROS的产生,ROS表达被抑制后,NLRP3炎性体蛋白及mRNA的表达亦明显降低。结论:LTA是粪肠球菌活化NLRP3炎性体的毒力因子,主要借助于ROS的产生
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