中国组织工程研究 ›› 2018, Vol. 22 ›› Issue (32): 5209-5214.doi: 10.3969/j.issn.2095-4344.0386

• 组织构建细胞学实验 cytology experiments in tissue construction • 上一篇    下一篇

Notch1/Hes1信号调控CCAAT/增强子结合蛋白α表达对高氧损伤肺泡Ⅱ型上皮细胞增殖与分化的影响

万峰云,卢红艳,万雪晴,郝晓波,朱  玥   

  1. 江苏大学附属医院儿科,江苏省镇江市  212001
  • 收稿日期:2018-05-26 出版日期:2018-11-18 发布日期:2018-11-18
  • 通讯作者: 卢红艳,博士,博士生导师,主任医师,江苏大学附属医院儿科,江苏省镇江市 212001
  • 作者简介:万峰云,女,湖北省随州市人,江苏大学在读硕士,主要从事新生儿肺发育方面的研究。
  • 基金资助:

    国家自然科学基金资助项目(81741052);江苏省自然科学基金资助项目(BK20161356)

Effect of Notch1/Hes1 signal regulating the expression of CCAAT/enhancer-binding protein alpha on the proliferation and differentiation of type II alveolar epithelial cells induced by hyperoxia

Wan Feng-yun, Lu Hong-yan, Wan Xue-qing, Hao Xiao-bo, Zhu Yue   

  1. Department of Pediatrics, Affiliated Hospital of Jiangsu University, Zhenjiang 212001, Jiangsu Province, China
  • Received:2018-05-26 Online:2018-11-18 Published:2018-11-18
  • Contact: Lu Hong-yan, MD, Doctoral supervisor, Chief physician, Department of Pediatrics, Affiliated Hospital of Jiangsu University, Zhenjiang 212001, Jiangsu Province, China
  • About author:Wan Feng-yun, Master candidate, Department of Pediatrics, Affiliated Hospital of Jiangsu University, Zhenjiang 212001, Jiangsu Province, China
  • Supported by:

    the National Natural Science Foundation of China, No. 81741052; the Natural Science Foundation of Jiangsu Province, No. BK20161356

摘要:

文章快速阅读:

文题释义:
C/EBPα:CCAAT/增强子结合蛋白α(CCAAT/enhancer-binding protein alpha,C/EBPα)是亮氨酸拉链转录因子家族成员之一,在细胞增殖、分化、信号传导、肿瘤发生以及机体的免疫、应激反应、能量代谢、血液生成等方面发挥重要作用。在肺泡上皮细胞中,C/EBPα可调节其增殖与分化,并促进肺表面活性物质生成,从而促进肺发育。
Notch1/Hes1信号:Notch信号通路是一条进化上十分保守的信号转导系统,由受体、配体和DNA结合蛋白3部分组成。Notch配体与受体相互作用,Notch蛋白经过3次剪切,由胞内段释放入胞质,并进入细胞核与转录因子CSL结合, 形成NICD/CSL转录激活复合体,从而激活Hes1等碱性-螺旋-环-螺旋(basichelix-loop-helix,bHLH)转录因子家族的靶基因,发挥生物学作用。Notch受体通过与配体的相互作用传导细胞信号,在多种组织和器官的早期发育过程中以及细胞增殖、分化、凋亡中发挥重要调控作用。
摘要
背景
:Notch1/Hes1信号和CCAAT/增强子结合蛋白α(CCAAT/enhancer-binding protein alpha,C/EBPα)在肺发育及肺损伤中均发挥重要作用。前期研究发现,高氧可引起肺泡Ⅱ型上皮细胞(type Ⅱ alveolar epithelial cell,AECII)增殖分化异常,并与C/EBPα异常表达有关,而这种异常是否与Notch1/Hes1信号调控有关,目前尚不清楚。
目的:探讨Notch1/Hes1信号调控C/EBPα表达对高氧损伤AECII增殖与分化的影响。
方法:体外培养人AECII,将细胞随机分为空气组、空气激活剂组(Notch通路激活剂Jagged1蛋白500 μg/L)、高氧组(按3 L/min 通入体积分数95%O2和5%CO2高纯混合气体且持续10 min)、高氧激活剂组(在通氧前30 min加入Notch通路激活剂Jagged1蛋白500 μg/L)。于干预后24 h收获各组细胞,采用RT-PCR和Western blot 法分别检测Notch1、Hes1及C/EBPα mRNA与蛋白表达水平;CCK-8法检测AECII细胞增殖;流式细胞术标记肺泡Ⅰ型上皮细胞特异性表面标志蛋白AQP5检测AECII分化。
结果与结论:与空气组比,空气激活剂组Notch1、Hes1、C/EBPα mRNA和蛋白表达显著增加(P < 0.05),AECII增殖增加而分化减少(P < 0.05);高氧组和高氧激活剂组Notch1、Hes1、C/EBPα mRNA和蛋白表达显著降低(P < 0.05),AECII增殖减少而分化增加(P < 0.05);与高氧组比,高氧激活剂组Notch1、Hes1、C/EBPα mRNA和蛋白表达增加(P < 0.05),AECII增殖增加而分化减少(P < 0.05);结果提示,Notch1/Hes1信号可调控C/EBPα表达并能影响高氧损伤AECII增殖与分化功能。

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
ORCID: 0000-0002-7898-2548(万峰云)

关键词: 肺泡Ⅱ型上皮细胞, Notch1/Hes1信号, CCAAT增强子结合蛋白α, 高氧, 增殖, 分化

Abstract:

BACKGROUND: Notch1/Hes1 signal and CCAAT/enhancer-binding protein alpha (C/EBPα) play important roles in lung development and injury. Preliminary studies have shown that hyperoxia can induce abnormal proliferation and differentiation of type II alveolar epithelial cells (AECII), which is related to C/EBPα expression. But, whether Notch1/Hes1 signal is involved remains unclear.
OBJECTIVE: To investigate the effect of Notch1/Hes1 signal regulating C/EBPα on the proliferation and differentiation of AECII induced by hyperoxia.
METHODS: Human AECIIs were cultured in vitro, and randomly divided into air group, air activator group (Notch pathway activator Jagged1 protein, 500 μg/L), hyperoxia group (95% O2 and 5% CO2 mixture gas administered at the speed of 3 L/minute for 10 minutes), hyperoxia activator group (500 μg/L Notch pathway activator Jagged1 protein added at 30 minutes before oxygen administration). AECIIs of each group were collected after 24 hours of intervention. The expression of Notch1, Hes1 and C/EBPα at mRNA and protein levels was determined by RT-PCR and western blot assay. The proliferation of AECII was measured by cell counting kit-8 assay. Flow cytometry labeled AQP5 was applied to detect the differentiation of AECII.
RESULTS AND CONCLUSION: Compared with the air group, the mRNA and protein expression levels of Notch1, Hes1 and C/EBPα were increased significantly in the air activator group (P < 0.05), the proliferation of AECII was increased and the differentiation was reduced significantly (P < 0.05). In the hyperoxia and hyperoxia activator groups, the mRNA and protein expression levels of Notch1, Hes1 and C/EBPα were significantly decreased, the proliferation of AECII was decreased and the differentiation was increased significantly (P < 0.05). Compared with the hyperoxia group, the mRNA and protein expression levels of Notch1, Hes1 and C/EBPα were significantly increased in the hyperoxia activator group (P < 0.05), and the proliferation of AECII was increased and the differentiation was decreased significantly (P < 0.05). These results suggest that Notch1/Hes1 signal regulates the expression of C/EBPα and affects the proliferation and differentiation of AECII after exposure to hyperoxia.

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

Key words: Pulmonary Alveoli, Epithelial Cells, Hyperoxia, CCAAT-Enhancer-Binding Protein-alpha, Cell Proliferation, Cell Differentiation, Tissue Engineering

中图分类号: