生物技术通报 ›› 2018, Vol. 34 ›› Issue (1): 215-222.doi: 10.13560/j.cnki.biotech.bull.1985.2017-0731

• 研究报告 • 上一篇    下一篇

Lsa蛋白对金黄色葡萄球菌介导的炎性细胞因子表达的影响

卫瑞阳1,2,3, 白杰1,3, 徐彬1,3, 席燕燕1,3, 王琳燚1,3, 王改利1,3, 付趁1,3, 魏凤仙1,3, 李绍钰1,3   

  1. 1. 河南省农业科学院畜牧兽医研究所,郑州 450002;
    2. 河南农业大学牧医工程学院,郑州 450002;
    3. 河南省饲料与养殖环境控制工程 技术研究中心 河南省畜禽繁育与营养调控重点实验室,郑州 450002
  • 收稿日期:2017-09-05 出版日期:2018-01-26 发布日期:2018-01-22
  • 作者简介:卫瑞阳,男,硕士,研究方向:微生物与分子生物;E-mail:ruiyangwei@126.com;白杰为本文共同第一作者
  • 基金资助:
    国家现代农业产业技术体系项目(CARS-41),国家重点研发计划项目(2016YFD0500509-09),河南省农业科学院优秀青年基金项目(2016YQ20)

Effects of Lectin Subunit Alpha on the Expression of Staphylococcus aureus-stimulated Inflammatory Cytokines Mediated

WEI Rui-yang1,2,3, BAI Jie1,3, XU Bin1,3, XI Yan-yan1,3, WANG Lin-yi1,3, WANG Gai-li1,3, FU Chen1,3, WEI Feng-xian1,3, LI Shao-yu1,3   

  1. 1. Institute of Animal Husbandry and Veterinary Science,Henan Academy of Agricultural Sciences,Zhengzhou 450002;
    2. College of Animal Science and Veterinary Medicine,Henan Agricultural University,Zhengzhou 450002;
    3. Henan Center for Feed and Aquaculture Environment Control Engineering Techniques Research,Henan Key Laboratory of Farm Animal Breeding and Nutritional Regulation,Zhengzhou 450002
  • Received:2017-09-05 Published:2018-01-26 Online:2018-01-22

摘要: 试验旨在研究家蝇Lsa(Lectin subunit alpha)蛋白在金黄色葡萄球菌(Staphylococcus aureus)刺激下的炎性反应。通过慢病毒转染的方法,将构建好的载体pLEX-Lsa及pLEX分别转染到RAW264.7细胞中,通过筛选,获得稳定表达的RAW-pLEX-Lsa及RAW-pLEX细胞系,其中RAW-pLEX细胞作为阴性对照。然后通过S. aureus刺激细胞,收集未刺激和刺激后3 h,6 h,12 h和24 h的细胞,且收集未刺激和刺激6 h细胞上清。提取RNA,通过实时定量PCR(RT-PCR)检测炎性细胞因子TNF-a,IL-1β,NFκB-1 和NFκB-2基因的相对转录水平。通过酶联免疫吸附测定(ELISA)检测细胞上清中TNF-a和IL-1β的蛋白水平。RT-PCR结果显示,在S. aureus刺激后,与RAW-pLEX细胞相比,RAW-pLEX-Lsa细胞中TNF-a的两个转录剪接体的相对转录水平,TNF-α-tv-1在6 h显著下调(P<0.05),TNF-α-tv-2在6 h和12 h显著下调(P<0.05);RAW-pLEX-Lsa细胞中IL-1β的两个转录剪接体的相对转录水平,IL-1β-T在3 h,6 h和12 h显著下调(P<0.05),IL-1β在3 h和6 h显著下调(P<0.05);RAW-pLEX-Lsa细胞中NFκB-1 和NFκB-2基因的相对转录水平无明显下降趋势。ELISA检测结果显示,在S. aureus刺激6 h后,与RAW-pLEX细胞相比,RAW-pLEX-Lsa细胞上清中,TNF-a的蛋白水平显著下调(P<0.05)。结果表明,家蝇Lsa蛋白可以有效地发挥抗炎活性,显著地抑制TNF-α和IL-1β的转录和生产,而TNF-α和IL-1β的转录和生产的下调并不是通过抑制NFκB信号通路的活性引起的。

关键词: 凝集素, RAW264.7, 炎性细胞因子, NFκB, 转录剪接体

Abstract: The attempt of this work is to investigate the anti-inflammatory activity of Musca domestica lectin subunit alpha(Lsa)toward Staphylococcus aureus. The well-constructed pLEX-Lsa and pLEX were transfected into RAW264.7 cells with recombinant lentiviruses,then the stably-expressed RAW-pLEX-Lsa and RAW-pLEX were obtained after screening,and RAW-pLEX was as a negative control. S. aureus was used to stimulate RAW-pLEX-Lsa cells and RAW-pLEX cells,then both un-stimulated cells and stimulated cells for 3 h,6 h,12 h,and 24 h were collected,and the cell culture supernatants of 6 h un-stimulated and stimulated cells were also collected. Real-time quantitative reverse transcription PCR(RT-PCR)was performed to analyze the mRNA expression of TNF-a,IL-1β,NFκB-1 and NFκB-2,and the protein level of TNF-a and IL-1β in the supernatant were detected by ELISA. The results of RT-PCR showed that the stimulation of RAW-pLEX-Lsa by S. aureussignificantly down-regulated the mRNA expression of TNF-a transcript variant 1(TNF-a-tv-1)at 6 h(P<0.05)and TNF-a transcript variant 2(TNF-a-tv-2)at 6 h and 12 h(P < 0.05),compared with the RAW-pLEX cells. The stable transfection of Lsa in RAW264.7 cells stimulated by S. aureus significantly down-regulated the mRNA expression of IL-1β-T at 3 h,6 h and 12 h(P < 0.05)and the mRNA expression of IL-1β at 3 h and 6 h(P < 0.05),compared with the RAW-pLEX cells,while the mRNA expression of NFκB-1 and NFκB-2 in RAW-pLEX-Lsa had insignificant decreasing. The results of ELISA demonstrated that the protein level of TNF-a in the supernatants of RAW-pLEX-Lsa cells at 6 h after stimulation by S. aureus significantly down-regulated(P < 0.05). In conclusion,Lsa possesses potent anti-inflammatory activity,and stable transfection of Lsa in RAW264.7 cells inhibits the expression and production of TNF-α and IL-1β. However,the inhibition of TNF-α and IL-1β is not resulted from blocking the activation of NF-κB signal pathway.

Key words: lectin, RAW264.7, inflammatory cytokines, NFκB, transcript variant