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密度感应系统基因lasR/rhlR对大鼠铜绿假单胞菌生物膜感染气管插管模型肺组织Foxp3、TGF-β_1和IL-10表达的影响
by
向青青 芦起 余加林 王政力 冯蕾 艾青 张云辉
in
叉头转录因子类
/ 密度感应
/ 生物膜
/ 白细胞介素10
/ 转化生长因子β1
/ 铜绿假单胞菌
2016
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密度感应系统基因lasR/rhlR对大鼠铜绿假单胞菌生物膜感染气管插管模型肺组织Foxp3、TGF-β_1和IL-10表达的影响
by
向青青 芦起 余加林 王政力 冯蕾 艾青 张云辉
in
叉头转录因子类
/ 密度感应
/ 生物膜
/ 白细胞介素10
/ 转化生长因子β1
/ 铜绿假单胞菌
2016
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密度感应系统基因lasR/rhlR对大鼠铜绿假单胞菌生物膜感染气管插管模型肺组织Foxp3、TGF-β_1和IL-10表达的影响
Journal Article
密度感应系统基因lasR/rhlR对大鼠铜绿假单胞菌生物膜感染气管插管模型肺组织Foxp3、TGF-β_1和IL-10表达的影响
2016
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目的研究铜绿假单胞菌野生株(PAO1)及其密度感应(QS)系统基因las R/rhl R缺失株(Δlas RΔrhl R)生物膜感染对气管插管模型鼠肺组织Foxp3、转化生长因子β_1(TGF-β_1)、白细胞介素10(IL-10)表达的影响。方法 21只SD大鼠随机均分为3组(n=7):PAO1组、Δlas RΔrhl R组及无菌对照组。体外培养生物膜(BF)并经导管置入气管,7d后行肺组织HE染色及肺部组织匀浆菌落计数(cfu),并检测支气管肺泡灌洗液(BALF)中IL-10、肺组织TGF-β_1、肺组织细胞Foxp3 m RNA表达情况。结果 PAO1组、Δlas RΔrhl R组肺组织均培养出细菌(cfu分别为10 400.00±6313.70、975.00±559.97/g肺组织),显著高于无菌对照组(未培养出细菌,P〈0.05),且PAO1组肺部细菌量明显高于Δlas RΔrhl R组(P〈0.05);肺组织HE染色结果显示:无菌对照组局部轻微充血,无明显炎症改变;PAO1组血管及支气管周围大量炎症细胞浸润,肺泡间隔增宽,局部脓肿、坏死;Δlas RΔrhl R组肺组织病理改变较PAO1组减轻。PAO1组、Δlas RΔrhl R组IL-10含量(分别为188.07±57.01ng/ml、93.31±17.26ng/ml)明显高于无菌对照组(57.43±22.13ng/ml),且PAO1组明显高于Δlas RΔrhl R组(P〈0.05)。PAO1组、Δlas RΔrhl R组TGF-β_1累积光密度值明显高于无菌对照组,且PAO1组明显高于Δlas RΔrhl R组(P〈0.05)。PAO1组、Δlas RΔrhl R组Foxp3 m RNA表达量(分别为4.62±1.07、2.15±1.43)明显高于无菌对照组(0.65±0.32),且PAO1组明显高于Δlas RΔrhl R组(P〈0.05)。结论铜绿假单胞菌QS系统las R/rhl R基因可促进铜绿假单胞菌生物膜引起的气管插管模型大鼠的炎症反应,促进肺组织Foxp3表达上调,伴随TGF-β_1、IL-10分泌增多,促使感染迁延化和慢性化。
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