畜牧兽医学报 ›› 2016, Vol. 47 ›› Issue (2): 374-380.doi: 10.11843/j.issn.0366-6964.2016.02.022

• 基础兽医 • 上一篇    下一篇

LPS通过AKT/FOXO1信号通路诱导C2C12肌管细胞MuRF1基因转录

刘妍1,2,梁辉煌1,刘玉兰1,唐中林3,汪文俊2,张晶1*   

  1. (1.武汉轻工大学动物营养与饲料科学湖北省重点实验室,武汉 430023;2.中南民族大学生命科学学院,武汉 430074;3.中国农业科学院北京畜牧兽医研究所,北京 100193)
  • 收稿日期:2015-07-13 出版日期:2016-02-23 发布日期:2016-02-23
  • 通讯作者: 张晶,讲师,E-mail:judyzhang1103@163.com
  • 作者简介:刘妍(1990-),女,河南安阳人,硕士生,主要从事动物营养与饲料科学研究,E-mail:sharonliuyan@126.com
  • 基金资助:

    湖北省自然科学基金(2013CFA029;2015CFB514)

LPS Induces MuRF1 Transcription through AKT/FOXO1 Mediating Pathway in C2C12 Myotubes

LIU Yan1,2,LIANG Hui-huang1,LIU Yu-lan1,TANG Zhong-lin3,WANG Wen-jun2,ZHANG Jing1*   

  1. (1.Hubei Key Laboratory of Animal Nutrition and Feed Science,Wuhan Polytechnic University,Wuhan 430023,China;2.College of Life Sciences,South-Central University for Nationalities,Wuhan 430074,China;3.Institute of Animal Science,Chinese Academy of Agricultural Sciences,Beijing 100193,China)
  • Received:2015-07-13 Online:2016-02-23 Published:2016-02-23

摘要:

以C2C12肌管细胞为试验材料,探讨脂多糖(LPS)诱导的炎症反应对肌管蛋白降解相关基因及信号通路的影响。选取不同质量浓度(10、100、1 000 ng•mL-1)的LPS分别刺激C2C12肌管细胞30 min和3 h,通过RT-qPCR 检测炎症因子TNF-α和IL-6的基因转录,确定LPS最佳刺激浓度以建立细胞炎症模型。用最佳浓度LPS分别刺激C2C12肌管细胞0 min、30 min、1 h、3 h、6 h、12 h、24 h,RT-qPCR检测MAFbx基因和MuRF基因在不同时间点的转录量变化。此外,1 000 ng•mL-1 LPS刺激C2C12肌管细胞12 h后,Western blot检测AKT/FOXO1、mTOR和P38信号通路相关蛋白质的表达情况。结果表明:LPS刺激C2C12肌管细胞的最佳浓度为1 000 ng•mL-1,在作用30 min和3 h时均能显著上调TNF-α、IL-6的基因转录,而在刺激12和24 h时MuRF1、IL-1β、IL-6和TLR4的基因转录显著上调。此外,1 000 ng•mL-1 LPS刺激C2C12肌管细胞12 h时,仅AKT和FOXO1蛋白磷酸化水平明显降低。基于以上结果,推测LPS通过调控AKT/FOXO1信号通路诱导C2C12肌管细胞MuRF1转录。

Abstract:

This study was designed to investigate the effects of the inflammatory induced by lipopolysaccharide (LPS) on the genes and pathways controlling the protein degradation in C2C12 myotubes.In order to establish an inflammatory cell mode,the C2C12 myotubes were treated with graded concentrations of LPS (10,100 and 1 000 ng•mL-1) for 30 min and 3 h,and then the mRNA transcription of TNF-α and IL-6 were determined by qPCR method.The results showed that 1 000 ng•mL-1 LPS was the optimal concentration.After the C2C12 myotubes were treated with 1 000 ng•mL-1 LPS for 0 min,30 min,1 h,3 h,6 h,12 h and 24 h,the mRNA transcription of MAFbx and MuRF1 were determined by qPCR.And the activation of AKT/FOXO1,mTOR and p38MAPK signaling pathway was detected by western blot at 12 h after LPS treatment.The results showed that 1 000 ng•mL-1 LPS significantly induced the mRNA transcription of TNF-α and IL-6 at 30 min and 3 h.The transcription of MuRF1,IL-1β,IL-6 and TLR4 were significantly up-regulated at 12 h and 24 h after LPS treatment.In addition,the phosphorylation of AKT and FOXO1 in C2C12 myotubes was significantly suppressed at 12 h after LPS treatment.Therefore,our results suggest that LPS can induce MuRF1 expression in C2C12 myotubes through the regulation of AKT/FOXO1 signaling pathway.

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