中国组织工程研究 ›› 2020, Vol. 24 ›› Issue (2): 254-259.doi: 10.3969/j.issn.2095-4344.1877

• 组织构建实验造模 experimental modeling in tissue construction • 上一篇    下一篇

N-乙酰半胱氨酸对烟熏模型大鼠肺组织氧化应激的影响

李  响1,王  玮2,夏书月1,何  巍1   

  1. 1沈阳医学院附属中心医院呼吸与危重症学科,辽宁省沈阳市  110024;2中国医科大学附属第一医院呼吸与危重症学科,辽宁省沈阳市  110001
  • 收稿日期:2019-05-17 修回日期:2019-06-11 接受日期:2019-07-20 出版日期:2020-01-18 发布日期:2019-12-25
  • 通讯作者: 李响,沈阳医学院附属中心医院呼吸与危重症学科,辽宁省沈阳市 110024
  • 作者简介:李响,女,1984年生,吉林省人,汉族, 2016年中国医科大学毕业,硕士,主治医师,主要从事呼吸系统疾病的基础与临床研究。
  • 基金资助:
    沈阳医学院科技基金项目(20182032);沈阳市卫生和计划生育委员会委科研课题计划项目(2017年);国家重点研发计划重大慢性非传染性疾病防控研究重点专项 (2016YFC1304502)

Effects of N-acetylcysteine on oxidative stress in lung tissue of smoked rats

Li Xiang1, Wang Wei2, Xia Shuyue1, He Wei1   

  1. 1Intensive Care Unit of Respiratory, Affiliated Central Hospital of Shenyang Medical College, Shenyang 110024, Liaoning Province, China; 2Intensive Care Unit of Respiratory, the First Hospital of China Medical University, Shenyang 110001, Liaoning Province, China
  • Received:2019-05-17 Revised:2019-06-11 Accepted:2019-07-20 Online:2020-01-18 Published:2019-12-25
  • Contact: Li Xiang, Intensive Care Unit of Respiratory, Affiliated Central Hospital of Shenyang Medical College, Shenyang 110024, Liaoning Province, China
  • About author:通讯作者:李响,沈阳医学院附属中心医院呼吸与危重症学科,辽宁省沈阳市 110024
  • Supported by:
    the Science and Technology Foundation of Shenyang Medical College, No. 20182032; the Research Project of Health and Family Planning Commission of Shenyang in 2017; the National Key Research and Development Program on Prevention and Control of Major Chronic Non-Communicable Diseases, No. 2016YFC1304502

摘要:

文题释义:

吸烟与慢性阻塞性肺疾病:慢性阻塞性肺疾病最重要的危险因素是吸烟。被动吸烟和生物质燃料使用等其他暴露也发挥作用。吸烟量和持续时间是疾病严重程度的促成因素。大多数(约80%)慢性阻塞性肺疾病患者都有吸烟史。吸烟到一定程度时,几乎所有吸烟者都可检测出肺功能下降。

N-乙酰半胱氨酸:是细胞维持正常生理功能的重要化合物谷胱甘肽的前体,而谷胱甘肽是细胞内重要的非酶类抗氧化物,能灭活活性氧,稳定细胞内膜结构,稳定细胞内的酶和蛋白质的功能,因此N-乙酰半胱氨酸能通过补充细胞内谷胱甘肽水平来增强抗氧化作用。

背景:N-乙酰半胱氨酸是谷胱甘肽的前体,可以直接清除氧自由基。然而,N-乙酰半胱氨酸是否通过降低氧化应激反应,减轻吸烟导致的肺损伤尚不完全清楚。

目的:探讨N-乙酰半胱氨酸对烟熏大鼠肺组织氧化应激的影响,并阐明其可能的作用机制。

方法:将30只雄性大鼠随机分为对照组、烟熏组、烟熏+N-乙酰半胱氨酸组。将烟熏组和烟熏+N-乙酰半胱氨酸组大鼠置于被动吸烟动物染毒系统,每次暴露20支香烟的烟雾中,2次/d,1 h/次,持续8周。N-乙酰半胱氨酸组大鼠每天被动烟熏前给予N-乙酰半胱氨酸200 mg/kg灌胃,持续8周。正常对照组大鼠仅单纯放置在染毒系统内,正常饲养8周。实验方案由沈阳医学院实验动物伦理委员会于2018年10月批准,批准号:研伦审第(2018)85号。

结果与结论:①病理观察发现烟熏组大鼠肺组织排列紊乱、肺泡间隔增厚、炎症细胞浸润和间质纤维化,而烟熏+N-乙酰半胱氨酸组肺组织出血、间质内炎症细胞数量显著减少、纤维化程度减轻;②与对照组相比,烟熏组大鼠肺组织丙二醛5和肌醇酶α基因表达升高,超氧化物歧化酶1基因表达显著降低,而N-乙酰半胱氨酸可抑制上述变化;③免疫荧光和Western blot结果均发现烟熏+N-乙酰半胱氨酸组大鼠肺组织丙二醛5和肌醇酶α蛋白表达较烟熏组显著降低,超氧化物歧化酶1蛋白表达较烟熏组升高。此外,烟熏+N-乙酰半胱氨酸组核因子E2相关因子和Keap1蛋白表达明显升高,Bach1蛋白表达显著降低;④结果表明,N-乙酰半胱氨酸通过降低氧化应激对烟熏导致的肺损伤发挥保护作用,其作用机制可能通过激活核因子E2相关因子/Keap1信号通路实现。

ORCID: 0000-0002-6428-8715(李响)

中国组织工程研究杂志出版内容重点:组织构建;骨细胞;软骨细胞;细胞培养;成纤维细胞;血管内皮细胞;骨质疏松组织工程


关键词: 烟熏, N-乙酰半胱氨酸, 同型半胱氨酸, 氧化应激, 核因子E2相关因子/Keap1信号通路, 肺损伤, 丙二醛5, 肌醇酶α

Abstract:

BACKGROUND: N-Acetyl-L-cysteine is a precursor of glutathione, which can directly scavenge oxygen free radicals. However, it is not entirely clear whether N-acetyl-L-cysteine can alleviate smoking-induced lung injury by reducing oxidative stress.

OBJECTIVE: To investigate the effects of N-acetylcysteine on oxidative stress in lung tissue of smoked rats, and to clarify its possible mechanism of action.

METHODS: Thirty male rats were randomly divided into control, smoked and smoked+N-acetylcysteine groups. The rats in the smoked and smoked+N-acetylcysteine groups were placed in the passive smoking animal exposure system, with smoking of 20 cigarettes, twice/d, 1 hour/times, for 8 consecutive weeks. The rats in the smoked+N-acetylcysteine group were given 200 mg/kg N-acetylcysteine via gavage before passive smoking daily, for 8 consecutive weeks. The control rats were fed normally for 8 consecutive weeks. The study was approved by the Laboratory Animal Ethical Committee of Shenyang Medical College in October 2018, approval No. (2018)85.

RESULTS AND CONCLUSION: (1) Pathological observation showed that the pulmonary tissue was disordered, alveolar septal thickening, inflammatory cell infiltration and interstitial fibrosis in the smoking group, while the pulmonary hemorrhage, the number of inflammatory cells and the degree of fibrosis in the smoking+N-acetylcysteine group were significantly reduced. (2) Compared with the control group, the expression levels of malondialdehyde-5 and inositol-alpha genes were significantly increased, and superoxide dismutase-1 gene expression was significantly decreased in the smoked group, while N-acetylcysteine could inhibit the above changes. (3) Immunofluorescence staining and western blot assay results revealed that the expression levels of malondialdehyde-5 and inositol-alpha in lung tissue of rats in the smoked+N-acetylcysteine group was significantly lower than those in the smoked group, and the expression level of superoxide dismutase-1 was significantly higher than that in the smoked group. In addition, the expression levels of Nrf2 and Keap1 mRNA and protein were significantly increased, and the expression levels of Bach1 mRNA and protein were significantly decreased in the smoking+N-acetylcysteine group. (4) These results suggest that N-acetylcysteine can protect smoking-induced lung injury by reducing oxidative stress, and which might be through activating Nrf2/Keap1 signaling pathway.

Key words: smoked, N-acetylcysteine, homocysteine, oxidative stress, Nrf2/Keap1 signaling pathway, lung injury, malondialdehyde-5, inositol-alpha

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