中国组织工程研究 ›› 2020, Vol. 24 ›› Issue (2): 204-208.doi: 10.3969/j.issn.2095-4344.1438

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

miR-155干预烧伤急性肺损伤模型大鼠:核转录因子κB通路的变化

黎鸿章,杨  坤,刘玉文,刘  攀,邱  波,邹  杰   

  1. 内江市第一人民医院烧伤科,四川省内江市  641000
  • 收稿日期:2019-03-26 修回日期:2019-04-02 接受日期:2019-05-05 出版日期:2020-01-18 发布日期:2019-12-25
  • 通讯作者: 邹杰,硕士,副主任医师。内江市第一人民医院烧伤科,四川省内江市 641000
  • 作者简介:黎鸿章,男,1973年生,四川省人,1996年同济医科大学毕业,副主任医师。

Effect of miR-155 on acute lung injury in burned rats: changes of nuclear factor-kappa B pathway

Li Hongzhang, Yang Kun, Liu Yuwen, Liu Pan, Qiu Bo, Zou Jie   

  1. Department of Burn Plastic Surgery, the First People’s Hospital of Neijiang, Neijiang 641000, Sichuan Province, China
  • Received:2019-03-26 Revised:2019-04-02 Accepted:2019-05-05 Online:2020-01-18 Published:2019-12-25
  • Contact: Zou Jie, Master, Associate chief physician, Department of Burn Plastic Surgery, the First People’s Hospital of Neijiang, Neijiang 641000, Sichuan Province, China
  • About author:Li Hongzhang, Associate chief physician, Department of Burn Plastic Surgery, The First People’s Hospital of Neijiang, Neijiang 641000, Sichuan Province, China

摘要:

文题释义:

miR-155:作用于靶基因抑制性κB激酶家族相关死亡域蛋白,减弱核转录因子κB活性,按照次级效应方式对炎性因子的释放产生抑制效果,降低机体损伤。

慢病毒载体:是以人类免疫缺陷Ⅰ型病毒为基础发展起来的基因治疗载体。区别一般的逆转录病毒载体,它对分裂细胞和非分裂细胞均具有感染能力。

背景:目前有研究关注核转录因子κB通路在烧伤大鼠急性肺损伤病理过程中的作用及机制,如miR-155靶向抑制KB激酶,进而减弱核转录因子κB活性,在烧伤大鼠急性肺损伤发挥作用,然而仍存在病理机制有待研究和确认。

目的:观察miR-155通过核转录因子κB通路对烧伤大鼠急性肺损伤的影响。

方法:采用温水水浴模拟烫伤法建立烧伤急性肺损伤大鼠模型,将烧伤大鼠随机分为烧伤急性肺损伤组、miR-155增强试剂组和miR-155抑制试剂组,液体复苏后,miR-155增强试剂组、miR-155抑制试剂组大鼠分别尾静脉注入5 μL的miR-155-mimics和miR-155-inhibitions。酶联免疫吸附剂测定肺泡灌洗液中肿瘤坏死因子α、白细胞介素1β的变化情况;苏木精-伊红染色法观察3组肺组织形态变化;Western blot法检测核转录因子κB及环氧化酶2蛋白表达;免疫组织化学染色检测肺组织核转录因子κB蛋白表达。

结果与结论:①苏木精-伊红染色结果表明,miR-155抑制试剂组、烧伤急性肺损伤组及miR-155增强试剂组肺组织损伤程度,逐渐加重(P < 0.05);②酶联免疫吸附实验结果表明,与烧伤急性肺损伤组相比,miR-155增强试剂组肿瘤坏死因子α、白细胞介素1β表达增加(P < 0.05),而miR-155抑制试剂组肿瘤坏死因子α、白细胞介素1β表达降低(P < 0.05);③Western结果表明,与烧伤急性肺损伤组相比,miR-155增强试剂组核转录因子κB、环氧化酶2蛋白表达增加(P < 0.05),而miR-155抑制试剂组核转录因子κB、环氧化酶2蛋白表达降低(P < 0.05);④免疫组织化学染色结果显示,miR-155抑制试剂组核转录因子κB蛋白表达增强,呈深棕色,中性粒细胞、单核巨噬细胞、肺泡上皮细胞的胞质及胞核内核转录因子κB表达最明显;⑤上述数据证实,肺组织细胞中核转录因子κB活性降低,可以通过下调miR-155来实现,从而降低肺损伤组织间的炎症反应。实验于2018年6月经内江市第一人民医院动物伦理委员会批准(批准号:1801270)。

ORCID: 0000-0002-3169-5146(黎鸿章)

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: miR-155, 大鼠, 急性肺损伤, 模型, 核转录因子κB, 环氧化酶2, 炎症, 白细胞介素1β, 肿瘤坏死因子α, 苏木精-伊红染色

Abstract:

BACKGROUND: Currently, studies have focused on the role and mechanism of nuclear factor-kappa B pathway in the pathological process of acute lung injury in burned rats, such as the targeting inhibition of κB kinase by miR-155, which further weakens the activity of nuclear factor-κB and plays a role in acute lung injury in burned rats. However, there are still some pathological mechanisms to be studied and confirmed.

OBJECTIVE: To investigate the effect of miR-155 on acute lung injury in burned rats through nuclear factor-κB pathway.

METHODS: The rat models of acute lung injury were established by warm water bath simulating burn injury. The burned rats were divided into acute lung injury, miR-155-mimics and miR-155-inhibitor groups. After fluid resuscitation, the rats in the miR-155-mimics and miR-155-inhibitor groups were injected into the tail vein of 5 μL of miR-155-mimics and miR-155-inhibitions, respectively. The expression levels of tumor necrosis factor-α and interleukin-1β in bronchoalveolar lavage fluid were detected by ELISA. The lung morphology in the three groups was observed by hematoxylin-eosin staining. The protein expression levels of nuclear factor-κB and cyclooxygenase 2 were evaluated by western blot assay. The nuclear factor-κB protein in lung tissues was detected by immunohistochemistry.

RESULTS AND CONCLUSION: (1) The results of hematoxylin-eosin staining showed that the severity of lung injury in the miR-155-inhibitor group, acute lung injury group and the miR-155-mimics group was increased gradually (P < 0.05). (2) ELISA results showed that compared with the acute lung injury group, the expression levels of tumor necrosis factor-α and interleukin-1β were increased in the miR-155-mimics group (P < 0.05), and decreased in the miR-155-inhibitor group (P < 0.05). (3) Western blot assay results showed that compared with the acute lung injury group, the expression levels of nuclear factor-κB and cyclooxygenase 2 proteins were increased in the miR-155-mimics group (P < 0.05), and decreased in the miR-155-inhibitor group (P < 0.05). (4) Immunohistochemical results showed that the expression level of nuclear factor-κB was increased in the miR-155-inhibitor group, which was dark brown. The expression of nuclear factor-κB in cytoplasm and nucleus of neutrophils, mononuclear macrophages, alveolar epithelial cells was the most obvious. (5) These results indicate that in lung tissue cells, decreased miR-155 can down-regulate nuclear factor-κB activity, which reduces the inflammatory response of the lung between the damaged tissue. The study was approved by the Laboratory Animal Ethics Committee of the First People’s Hospital of Neijiang, approval No. 1801270.

Key words: miR-155, rats, acute lung injury, model, nuclear factor-κB, cyclooxygenase 2, inflammation, interleukin-1β, tumor necrosis factor-α, hematoxylin-eosin staining

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