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脓毒败血症会导致病人发生急性肺损伤,继而引发重症监护室病人死亡风险增加[1-2]。丙泊酚对脓毒败血症诱发的急性肺损伤的保护作用已被证实[3],但其机制还未阐明。研究[4]显示,核苷酸结合结构域样受体蛋白3(nucleotide-binding domain-like receptor protein 3, NLRP3)炎症体参与急性肺损伤的形成和进展。氧化应激反应参与了急性肺损伤的形成和进展[5],硫氧还蛋白相互作用蛋白(thioredoxin-interacting protein, TXNIP)是关键的氧化应激衔接蛋白,TXNIP从硫氧还蛋白解离,结合NLRP3,激活NLRP3炎症体[6]。由于NLRP3具有促炎作用,抑制NLRP3能抑制炎症的形成和进展,而丙泊酚被认为主要通过抑制炎症反应发挥肺保护作用[3]。本研究观察抑制NLRP3信号通路对丙泊酚肺保护作用的影响,以探讨丙泊酚肺保护作用机制。现作报道。
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注射48 h后,对照组与丙泊酚组10只小鼠全部存活,LPS组4只、LPS+丙泊酚组6只存活。对照组与丙泊酚组小鼠肺组织结构较为正常,LPS组小鼠肺泡壁严重破坏,肺部组织毛细血管发生充血、扩张等现象,肺间质发生水肿,肺泡间隔变宽;丙泊酚+LPS组小鼠肺泡间隔轻度变宽,肺部组织损伤较LPS组减轻(见图 1)。
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腹腔注射48 h后,LPS组小鼠MDA明显高于对照组,SOD活性明显低于对照组(P < 0.01)。丙泊酚组MDA、SOD与对照组差异均无统计学意义(P>0.05)。丙泊酚+LPS组MDA明显低于LPS组(P < 0.01),与对照组差异无统计学意义(P>0.05);SOD活性明显高于LPS组(P < 0.01),但均明显低于对照组和丙泊酚组(P < 0.01)(见表 1)。
分组 MDA/(μmol/g) SOD/(kU/g) 对照组 1.37±0.28 372.84±7.42 LPS组 2.39±0.38** 304.23±6.21** 丙泊酚组 1.42±0.25## 377.2±7.83## 丙泊酚+LPS组 1.68±0.34## 355.4±6.93**##ΔΔ F 11.02 100.44 P < 0.01 < 0.01 MS组内 0.100 50.739 q检验:与对照组比较**P < 0.01;与LPS组比较##P < 0.01;与丙泊酚组比较ΔΔP < 0.01 表 1 各组小鼠右侧肺部组织SOD、MDA比较(ni=5;x±s)
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丙泊酚组TXNIP mRNA和NLRP3 mRNA与对照组差异均无统计学意义(P>0.05);LPS组TXNIP mRNA和NLRP3 mRNA表达均较对照组和丙泊酚组明显上调(P < 0.01);丙泊酚+LPS组TXNIP mRNA和NLRP3 mRNA表达均明显低于LPS组(P < 0.01),但仍均明显高于对照组和丙泊酚组(P < 0.01)(见表 2)。
分组 TXNIP mRNA NLRP3 mRNA 对照组 1.01±0.03 1.02±0.02 LPS组 4.73±0.24** 7.64±0.22** 丙泊酚组 1.18±0.02## 1.15±0.06## 丙泊酚+LPS组 2.01±0.06**##ΔΔ 2.72±0.05**##ΔΔ F 948.19 3 507.06 P < 0.01 < 0.01 MS组内 0.016 0.014 q检验:与对照组比较**P < 0.01;与LPS组比较##P < 0.01;与丙泊酚组比较ΔΔP < 0.01 表 2 各组小鼠肺组织TXNIP mRNA、NLRP3 mRNA表达比较(ni=5;x±s)
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丙泊酚组TXNIP和NLRP3蛋白表达与对照组差异均无统计学意义(P>0.05);LPS组TXNIP和NLRP3蛋白表达均明显高于对照组和丙泊酚组(P < 0.01);丙泊酚+LPS组TXNIP和NLRP3蛋白表达均明显低于LPS组(P < 0.01)(见表 3)。
分组 TXNIP NLRP3 对照组 0.020±0.003 0.017±0.003 LPS组 0.132±0.021** 0.126±0.030** 丙泊酚组 0.020±0.002## 0.19±0.005**## 丙泊酚+LPS组 0.025±0.003## 0.024±0.003**##ΔΔ F 70.99 148.31 P < 0.01 < 0.01 MS组内 0.000 0.000 q检验:与对照组比较**P < 0.01;与LPS组比较##P < 0.01;与丙泊酚组比较ΔΔP < 0.01 表 3 各组小鼠肺组织TXNIP、NLRP3表达水平比较(ni=5;x±s)
丙泊酚对小鼠急性肺损伤NLRP3信号通路的影响
Effect of the propofol on the NLRP3 signaling pathway in mice with acute lung injury
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摘要:
目的分析丙泊酚对脂多糖(LPS)诱导的急性肺损伤的保护作用及对硫氧还蛋白相互作用蛋白(thioredoxin-interacting protein,TXNIP)、核苷酸结合结构域样受体蛋白3(nucleotide-binding domain-like receptor protein 3,NLRP3)表达的影响,探讨丙泊酚肺保护的可能机制。 方法ICR小鼠40只,随机分为对照组(腹腔注射pH 7.4磷酸缓冲液)、LPS组(腹腔注射30 mg/kgLPS)、丙泊酚组(静脉注射40 mg/kg丙泊酚)和丙泊酚+LPS组(静脉注射40 mg/kg丙泊酚后20 min腹腔注射30 mg/kg脂多糖),各10只。分别在光镜下对肺组织进行病理分析,检测MDA含量、SOD活性和肺上皮细胞核内TXNIP和NLRP3表达水平。 结果肺组织病理学显示,丙泊酚明显减弱LPS诱发的小鼠急性肺损伤。与对照组比较,LPS组小鼠肺组织MDA含量明显升高,SOD活性明显下降(P < 0.01),TXNIP、NLRP3 mRNA和蛋白表达均明显上调(P < 0.01);与LPS组比较,丙泊酚+LPS组MDA含量明显降低,SOD活性明显升高(P < 0.01),肺组织TXNIP、NLRP3 mRNA和蛋白表达均明显下调(P < 0.01)。 结论静脉预注丙泊酚可通过抑制TXNIP、NLRP3 mRNA和蛋白表达水平,有效缓解LPS诱导的急性肺损伤,对肺部组织起到保护作用。 -
关键词:
- 急性肺损伤 /
- 丙泊酚 /
- 核苷酸结合结构域样受体蛋白3 /
- 硫氧还蛋白相互作用蛋白 /
- 小鼠
Abstract:ObjectiveTo analyze the protective effects of propofol on the acute lung injury induced by lipopolysaccharide(LPS)and expression levels of thioredoxin-interacting protein(TXNIP)and nucleotide-binding domain-like receptor protein 3(NLRP3), and explore the possible mechanisms of lung protection with propofol. MethodsForty ICR mice were divided into the control group(treatment with intraperitoneal injection of pH 7.4 phosphate buffer), LPS group(treatment with intraperitoneal injection of 30 mg/kg LPS), propofol group(treatment with intravenous injection of 40 mg/kg propofol)and propofol +LPS group(treatment with intraperitoneal injection of 30 mg/kg LPS after 20 min of intravenous injection of 40 mg/kg propofol)(10 mice in each group).The pathological analysis of lung tissue was conducted under light microscope, and the MDA content, SOD activity and expression levels of TXNIP and NLRP3 in pulmonary epithelial cells were detected. ResultsThe lung histopathological results showed that propofol could significantly reduced the acute lung injury induced by LPS in mice.Compared with the control group, the MDA content and SOD activity in the lung tissues of LPS group were significantly increased and decreased, respectively(P < 0.01), and the expression levels of TXNIP, NLRP3 mRNA and protein were significantly up-regulated in LPS group(P < 0.01).Compared with the LPS group, the MDA content and SOD activity were significantly decreased and increased in the propofol+LPS group, respectviely(P < 0.01), and the expression levels of TXNIP and NLRP3 mRNA and protein in lung tissues of propofol+LPS group were significantly down-regulated(P < 0.01). ConclusionsThe intravenous preinjection of propofol can down-regulate the mRNA and protein expressions of TXNIP and NLRP3 in lung tissues, effectively alleviate the acute lung injury induced by LPS, and play a protective role in lung tissue. -
表 1 各组小鼠右侧肺部组织SOD、MDA比较(ni=5;x±s)
分组 MDA/(μmol/g) SOD/(kU/g) 对照组 1.37±0.28 372.84±7.42 LPS组 2.39±0.38** 304.23±6.21** 丙泊酚组 1.42±0.25## 377.2±7.83## 丙泊酚+LPS组 1.68±0.34## 355.4±6.93**##ΔΔ F 11.02 100.44 P < 0.01 < 0.01 MS组内 0.100 50.739 q检验:与对照组比较**P < 0.01;与LPS组比较##P < 0.01;与丙泊酚组比较ΔΔP < 0.01 表 2 各组小鼠肺组织TXNIP mRNA、NLRP3 mRNA表达比较(ni=5;x±s)
分组 TXNIP mRNA NLRP3 mRNA 对照组 1.01±0.03 1.02±0.02 LPS组 4.73±0.24** 7.64±0.22** 丙泊酚组 1.18±0.02## 1.15±0.06## 丙泊酚+LPS组 2.01±0.06**##ΔΔ 2.72±0.05**##ΔΔ F 948.19 3 507.06 P < 0.01 < 0.01 MS组内 0.016 0.014 q检验:与对照组比较**P < 0.01;与LPS组比较##P < 0.01;与丙泊酚组比较ΔΔP < 0.01 表 3 各组小鼠肺组织TXNIP、NLRP3表达水平比较(ni=5;x±s)
分组 TXNIP NLRP3 对照组 0.020±0.003 0.017±0.003 LPS组 0.132±0.021** 0.126±0.030** 丙泊酚组 0.020±0.002## 0.19±0.005**## 丙泊酚+LPS组 0.025±0.003## 0.024±0.003**##ΔΔ F 70.99 148.31 P < 0.01 < 0.01 MS组内 0.000 0.000 q检验:与对照组比较**P < 0.01;与LPS组比较##P < 0.01;与丙泊酚组比较ΔΔP < 0.01 -
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