畜牧兽医学报 ›› 2016, Vol. 47 ›› Issue (9): 1853-1860.doi: 10.11843/j.issn.0366-6964.2016.09.014

• 遗传繁育 • 上一篇    下一篇

基于iTRAQ 技术的脂多糖刺激下奶牛乳腺上皮细胞的蛋白组学分析

李莲,唐娟,吴洁,王根林*   

  1. (南京农业大学动物科技学院,南京 210095)
  • 收稿日期:2016-04-18 出版日期:2016-09-23 发布日期:2016-09-23
  • 通讯作者: 王根林,教授,主要从事动物生殖生理及调控研究,E-mail:glwang@njau.edu.cn
  • 作者简介:李莲(1979-),女,内蒙古人,讲师,硕士,主要从事奶牛以及动物生殖生理方面的研究,E-mail:lilian@njau.edu.cn
  • 基金资助:

    国家自然科学基金(31372290);中央高校基本科研业务费专项资金(KJQN201607)

Analysis of Expression Protein Profiles of Bovine Mammary Epithelial Cell Based on Isobaric Tag for Relative and Absolute Quantification Proteomics and Bioinformatics Technique

LI Lian,TANG Juan,WU Jie,WANG Gen-lin*   

  1. (College of Animal Science and Technology,Nanjing Agricultural University,Nanjing 210095,China)
  • Received:2016-04-18 Online:2016-09-23 Published:2016-09-23

摘要:

基于iTRAQ多重标记串联质谱技术系统研究脂多糖刺激下乳腺上皮细胞蛋白的差异表达,并对与乳蛋白、乳脂肪相关差异表达基因进行验证。培养纯化后的乳腺上皮细胞,经脂多糖(LPS)处理后提取细胞蛋白,采用 iTRAQ 标记和联合二维液相色谱-串联质谱(2D-LC-MS/MS)检测分析得到各组间细胞差异表达蛋白,并采用蛋白印迹和酶联免疫法(ELISA)对差异蛋白进行验证,然后对与乳蛋白、乳脂肪相关基因的相互作用蛋白进行PPI(Protein protein interaction)预测。乳腺上皮细胞共鉴定出 2 487个蛋白,其中差异蛋白共341个,与对照组相比,163个蛋白表达上调,178个蛋白表达下调。iTRAQ测定结果显示,LPS处理组与对照组相比,αs1-酪蛋白(CSN1S1)、κ-酪蛋白(CSN3)和脂肪酸合酶(FASN)基因蛋白表达水平有统计学意义;经蛋白印迹试验结果表明,LPS诱导组αs1-酪蛋白表达水平同对照组比较,明显降低(P<0.05);应用ELISA方法测定细胞培养液中αs1-酪蛋白、κ-酪蛋白和脂肪酸合酶的浓度结果显示,LPS诱导组细胞培养液中上述蛋白的浓度明显低于对照组(P<0.05)。综上表明,LPS诱导的炎症反应可影响乳腺上皮细胞的乳蛋白和乳脂肪的合成。

Abstract:

The aim of the present study was to screen differential expression proteins associated with inflammatory model of bovine mammary epithelial cells (BMECs) induced by lipopolysaccharide (LPS) using isobaric tags for relative and absolute quantification (iTRAQ) combined with 2-dimensional liquid chromatography-tandem mass spectrometry (2D-LC-MS/MS).Normal and LPS-treated bovine mammary epithelial cells were analyzed using iTRAQ combined with 2D-LC-MS/MS.Bioinformatics analyses of differentially expressed proteins were performed by means of Gene Ontology and PPI (Protein protein interaction)analysis.According to iTRAQ results,a total of 2 487 proteins were identified.Compared with normal BMECs,163 proteins were significantly up-regulated while 178 proteins were significantly down-regulated in response to LPS treatment.The bioinformatics analyses highlighted the effects of LPS treatment on milk proteins and fat synthesis such as αs1-casein,κ-casein and fatty acid synthase.Down-regulation of αs1-casein (CSN1S1) in BMECs was confirmed by Western blotting;αs1-casein,κ-casein (CSN3) and fatty acid synthase (FASN) in culture medium were confirmed by ELISA.The results showed that LPS treatment significantly decreased the expression of αs1-casein in BMECs (P<0.05),and also decreased the concentration of αs1-caseins,κ-casein and fatty acid synthase in culture medium (P<0.05).In conclusion,LPS treatment could affect the synthesis of protein and fat in BMECs.

中图分类号: