硫化氢对臭氧致小鼠气道炎症的影响

目的:研究硫化氢(H_2S)对臭氧(O_3)暴露所致小鼠气道炎症的影响,并探究其机制。方法:32只C57BL/6小鼠随机分为正常对照(control)组、O_3组、硫氢化钠(NaHS)+O_3组以及NaHS组。第1、3、5天将O_3组和NaHS+O_3组小鼠置于2.14 mg/m~3O_3环境中暴露3 h,同时control组和NaHS组置于新鲜空气中暴露3 h。每次暴露前30 min,NaHS+O_3组和Na HS组小鼠腹腔注射Na HS(14μmol/kg)。末次暴露24 h后测定小鼠气道反应性,收集支气管肺泡灌洗液用于炎性细胞计数和总蛋白测定,收集肺组织标本行HE染色观察形态改变。测定肺组织中IL-6、IL-8、丙二醛(MDA)和NF-κB p65蛋白水平。结果:与control组相比,O_3组的气道反应性、炎性细胞数、总蛋白浓度和炎症评分,以及IL-6、IL-8、MDA和NF-κB p65蛋白水平明显增高,NaHS+O_3组则明显低于O_3组。结论:H_2S显著减轻了O_3暴露所致气道炎症反应,可能与抑制脂质过氧化和降低NF-κB表达相关。

Effect of hydrogen sulfide on airway inflammation induced by ozone in mice

AIM: To investigate the effect of hydrogen sulfide (H₂S) on airway inflammation induced by ozone (O₃) exposure and its mechanisms.METHODS: C57BL/6 mice (n=32) were randomly divided into control group, O₃ group, NaHS+O₃ group and NaHS group. The mice in O₃ group and O₃+NaHS group were exposed to 2.14 mg/m³ O₃ for 3 h on days 1, 3 and 5, while the mice in control group and NaHS group were exposed to filtered air. NaHS (14 μmol/kg) was administered intraperitoneally to the mice in NaHS group and O₃+NaHS group 30 min before each exposure. After the last exposure for 24 h, the airway responsiveness was determined, and bronchoalveolar lavage fluid (BALF) was collected for counting inflammatory cells and measuring total protein concentration. The lung tissues were collected for observing the morphological changes with HE staining. The levels of interleukin-6 (IL-6), interleukin-8 (IL-8), malondialdehyde (MDA) and NF-κB p65 protein in the lungs were determined.RESULTS: Compared with control group, the airway responsiveness, inflammatory cells, protein concentration, inflammation score, levels of IL-6, IL-8, MDA and NF-κB p65 in O₃ group increased significantly, but these in NaHS+O₃ group decreased compared with O₃  group.CONCLUSION: The present findings suggest that H₂S attenuates O₃ induced airway inflammation by inhibiting NF-κB expression and preventing lipid peroxidation.