Effects of Selenium on the Key Factors in Nod2/MAPK/mTORs Signaling Pathways in the bMECs Infected S. aureus
BI ChongLiang1, LIU JunJun2, WANG Heng2,3, WANG Juan1, HAN ZhaoQing1, GUAN LiZeng,11 College of Agriculture and Forestry Science, Linyi University, Linyi 276005, Shandong 2 College of Medicine and Veterinary, Yangzhou University, Yangzhou 225009, Jiangsu 3 Jiangsu Co-innovation Center for Prevention and Control of Important Animal Infectious Diseases and Zoonoses, Yangzhou 225009 Jiangsu
Abstract 【Objective】Whether selenium (Se) could regulate the inflammatory damage of bovine mammary epithelial cells (bMECs) induced by S. aureus through Nod2/MAPK/mTOR pathway remains to be further studied. So in the study, the effects of Se on the key proteins in the Nod2/MAPK/mTORs signaling pathway in the bovine mammary epithelial cells (bMECs) infected by S. aureus was studied in order to provide a theoretical basis for elucidating the immune regulation mechanism of Se.【Method】 Firstly, the bMECs were inoculated into the 6 well plates with 10 6cells/well. When more than 80% of the cells were confluent, the medium was replaced with the one containing different concentrations of Se (2, 4 and 8 μmol·L -1) and continued to culture for 12 h. Then after washing each well for 3 times with PBS, S.aureus was added into 6-well plates at a ratio of MOI=1:1 and continued to culture for 0.5 h. The bMECs were collected for further detection of related proteins expression. The experiment was divided into three groups: control (Con) group (bMECs), model (Mod) group (bMECs+S. aureus) and experimental group. The experimental group was divided into three sub-dose groups, namely Low group (bMECs+2 μmol·L -1 Se+S. aureus), Mid group (bMECs+4 μmol·L -1 Se+S.aureus) and Hig group (bMECs+8 μmol·L -1 Se+S. aureus), with three replicates each group. Total protein was extracted from the above bMECs using a bicinchoninic acid (BCA) protein assay kit. The expressions level of Nod2 and RIP2 and the phosphorylation level of JNK, AKT and mTOR proteins in bMECs were detected by Western blotting. The protein samples were loaded into 10% SDS polyacrylamide gel for electrophoresis, and the uniform volume of protein was 20 μg/hole. Then the protein was transferred to polyvinylidene fluoride (PVDF) membranes. The PVDF membranes were blocked with 5 mL 5% nonfat milk for 2 h, then skimmed the nonfat milk and washed the membranes with TBST, subsequently the membranes were incubated overnight with 5 mL primary antibodies including Nod2, RIP2, JNK, AKT, mTOR and β-actin. The primary antibodies were recovered, and 5 mL second antibodies were added to the membranes and incubated for 2 h at room temperature. Subsequently the second antibodies were recovered the membranes were washed with TBST for 5 times. Finally the membranes were developed with chemiluminescent substrate under darkroom conditions.【Result】S. aureus could significantly increase the expression of Nod2 and RIP2 proteins and the phosphorylation of JNK, AKT and mTOR proteins in bMECs (P<0.01). At 0.5 h after S. aureus infection, the level of Nod2 protein increased significantly (P<0.01). The expression of Nod2 protein was significantly inhibited by adding 2 μmol·L -1 Se to the medium (P<0.01), and the expression of Nod2 was significantly inhibited by adding 8 μmol·L -1 Se to the medium (P<0.05); at 0.5 h after S. aureus infection, RIP2 protein level was significantly increased (P<0.05), while the expression of RIP2 protein was significantly inhibited by adding 8 μmol·L -1 Se to the medium (P<0.05); at 0.5 h after S. aureus infection, the phosphorylation level of JNK protein in model group was significantly higher than that in control group (P<0.01). The phosphorylation of JNK protein was significantly inhibited by adding 4 μmol·L -1 Se to the medium (P<0.05), and the phosphorylation of JNK protein was significantly inhibited by adding 8 μmol·L -1 Se to the medium (P<0.01); at 0.5 h after S. aureus infection, the phosphorylation level of AKT protein in the model group was significantly higher than that in the control group (P<0.01). The phosphorylation level of JNK protein was significantly inhibited by adding 4 μmol·L -1 Se to the medium (P<0.01). The phosphorylation level of AKT protein was significantly inhibited by adding 8 μmol·L -1 Se to the medium (P<0.05). After 0.5 h of S. aureus infection, the phosphorylation level of mTOR protein was significantly increased in the model group (P<0.01). The phosphorylation of mTOR protein was significantly inhibited by adding 4 and 8 μmol·L -1 Se to the medium (P<0.05). 【Conclusion】Se could alleviate the inflammatory response of bMECs induced by S. aureus by inhibiting the protein expression of key factors in the bMECs Nod2/MAPK/mTORs signaling pathway. Keywords:selenium; S. aureus;Nod2/MAPK/mTORs;bMECs
PDF (930KB)元数据多维度评价相关文章导出EndNote|Ris|Bibtex收藏本文 本文引用格式 毕崇亮, 刘俊俊, 王亨, 王娟, 韩照清, 关立增. 硒对S. aureus诱导的奶牛乳腺上皮细胞Nod2/MAPK/mTORs信号通路关键蛋白表达的影响[J]. 中国农业科学, 2019, 52(16): 2891-2898 doi:10.3864/j.issn.0578-1752.2019.16.014 BI ChongLiang, LIU JunJun, WANG Heng, WANG Juan, HAN ZhaoQing, GUAN LiZeng. Effects of Selenium on the Key Factors in Nod2/MAPK/mTORs Signaling Pathways in the bMECs Infected S. aureus[J]. Scientia Acricultura Sinica, 2019, 52(16): 2891-2898 doi:10.3864/j.issn.0578-1752.2019.16.014
A:Nod2蛋白相对表达量;B:RIP2蛋白相对表达量。“#”表示模型组与对照组相比P<0.05、“##”表示模型组与对照组相比P<0.01;“★”表示实验组与模型组相比P<0.05、“★★”表示实验组与模型组相比P<0.01。下同 Fig. 1Effects of Se on the expression of Nod2 and RIP2 key proteins in the Nod2 signaling pathway of bMECs induced by S. aureus
A: relative expression of Nod2 mRNA; B: relative expression of RIP2 mRNA. “#”indicates the model group(Mod) compares with the control group (Con) at P<0.05 level, “##”indicate model group (Mod) compares with control group (Con) at P<0.01 level; “★”indicates the test group compares with the model group (Mod) at P<0.05 level, “★★”indicate the test group compares with the model group (Mod) at P<0.01 level. The same as below
李广栋, 吕东颖, 田秀芝, 姬鹏云, 郭江鹏, 路永强, 刘国世 . 组学技术在奶牛乳房炎上应用的相关研究进展 , 2019,52(2):350-358. DOI:10.3864/j.issn.0578-1752.2019.02.013Magsci [本文引用: 1] <p id="C2">奶牛乳房炎发病率较高、病因复杂,是影响世界奶牛业发展的主要常见疾病之一。由金黄色葡萄球菌、大肠杆菌、链球菌等病原体引起的临床和隐形乳房炎对动物性食品安全及畜牧业的正常发展构成巨大安全隐患,全球每年因奶牛乳房炎导致的经济损失多达数十亿美元。近年来随着测序技术的不断突破和测序成本的不断降低,生命科学的研究进入了多组学时代,其在畜牧业中的应用也越来越广泛。对奶牛乳房炎来说,传统的组织病理学筛查、体细胞计数、牛乳pH检测、牛乳电导率检测、酶活检验、红外热显影等诊断技术由于其自身的局限性难以充分全面地阐明其发病机理,已不能满足科研人员的需求。组学技术即Omics,主要包括基因组学技术、蛋白质组学技术和代谢组学技术等。通过基因组学研究不仅能从转录层面上揭示奶牛乳房炎复杂性状的表型变异及遗传基础,还能从转录后调控(miRNAs、LncRNAs等)和表观遗传学修饰(DNA甲基化、组蛋白修饰等)层面挖掘出相关的DNA和RNA变化及多分子间的相互作用规律,能够帮助我们更好地了解奶牛乳腺组织对病原体的免疫应答机制,筛选鉴定出乳房炎抗性的信号通路及关键候选基因,从而提高基因组预测或选择的准确性。利用蛋白质组学技术能够对不同环境不同状态的牛乳及乳腺组织的蛋白质种类、表达丰度、蛋白互作、翻译后修饰等进行比较分析,对差异表达的蛋白质经过COG功能注释、数据库比对、GO和Pathway富集分析,可以从蛋白水平揭示乳房炎发生及防御过程中的复杂调控机制,同时还能发现乳房炎诊断的标记分子,进而为乳房炎治疗药物的研发提供潜在的精准靶点。代谢组学是系统生物学的重要组成部分。通过代谢组学研究,能够同时对机体在内、外环境等复杂因素作用下及特定生理时期内所有低分子量代谢产物(如氨基酸、脂类、碳水化合物等)进行精准、高效的定性和定量分析,从而阐明相关的代谢途径;其作为基因表达的最下游,能使基因和蛋白质表达的微小变化在代谢物水平上得到放大,进而可以更充分地反映细胞功能。将代谢组学技术应用到奶牛乳房炎研究中,能够分析出差异代谢物、鉴定出相关的生物标志物,进而揭示奶牛乳腺的生理及病理变化过程。总之,将各组学技术及多组学整合关联分析应用到奶牛乳房炎研究中可以更深入地揭示其病原防御机制,进而为乳房炎的预测、诊断和治疗提供有价值的参考和借鉴。本文就最近几年组学技术在奶牛乳房炎领域的研究进展进行综述,以期为我国奶牛健康及奶业安全发展提供指导。</p> LIG D, LüD Y, TIANX Z, JIP Y, GUOJ P, LUY Q, LIUG S . Research progress of omics technologies in cow mastitis Scientia Agricultura Sinica, 2019,52(2):350-358.(in Chinese) DOI:10.3864/j.issn.0578-1752.2019.02.013Magsci [本文引用: 1] <p id="C2">奶牛乳房炎发病率较高、病因复杂,是影响世界奶牛业发展的主要常见疾病之一。由金黄色葡萄球菌、大肠杆菌、链球菌等病原体引起的临床和隐形乳房炎对动物性食品安全及畜牧业的正常发展构成巨大安全隐患,全球每年因奶牛乳房炎导致的经济损失多达数十亿美元。近年来随着测序技术的不断突破和测序成本的不断降低,生命科学的研究进入了多组学时代,其在畜牧业中的应用也越来越广泛。对奶牛乳房炎来说,传统的组织病理学筛查、体细胞计数、牛乳pH检测、牛乳电导率检测、酶活检验、红外热显影等诊断技术由于其自身的局限性难以充分全面地阐明其发病机理,已不能满足科研人员的需求。组学技术即Omics,主要包括基因组学技术、蛋白质组学技术和代谢组学技术等。通过基因组学研究不仅能从转录层面上揭示奶牛乳房炎复杂性状的表型变异及遗传基础,还能从转录后调控(miRNAs、LncRNAs等)和表观遗传学修饰(DNA甲基化、组蛋白修饰等)层面挖掘出相关的DNA和RNA变化及多分子间的相互作用规律,能够帮助我们更好地了解奶牛乳腺组织对病原体的免疫应答机制,筛选鉴定出乳房炎抗性的信号通路及关键候选基因,从而提高基因组预测或选择的准确性。利用蛋白质组学技术能够对不同环境不同状态的牛乳及乳腺组织的蛋白质种类、表达丰度、蛋白互作、翻译后修饰等进行比较分析,对差异表达的蛋白质经过COG功能注释、数据库比对、GO和Pathway富集分析,可以从蛋白水平揭示乳房炎发生及防御过程中的复杂调控机制,同时还能发现乳房炎诊断的标记分子,进而为乳房炎治疗药物的研发提供潜在的精准靶点。代谢组学是系统生物学的重要组成部分。通过代谢组学研究,能够同时对机体在内、外环境等复杂因素作用下及特定生理时期内所有低分子量代谢产物(如氨基酸、脂类、碳水化合物等)进行精准、高效的定性和定量分析,从而阐明相关的代谢途径;其作为基因表达的最下游,能使基因和蛋白质表达的微小变化在代谢物水平上得到放大,进而可以更充分地反映细胞功能。将代谢组学技术应用到奶牛乳房炎研究中,能够分析出差异代谢物、鉴定出相关的生物标志物,进而揭示奶牛乳腺的生理及病理变化过程。总之,将各组学技术及多组学整合关联分析应用到奶牛乳房炎研究中可以更深入地揭示其病原防御机制,进而为乳房炎的预测、诊断和治疗提供有价值的参考和借鉴。本文就最近几年组学技术在奶牛乳房炎领域的研究进展进行综述,以期为我国奶牛健康及奶业安全发展提供指导。</p>
赫娜, 王长法, 杨宏军, 何洪彬, 杨少华, 王立群, 高运东, 仲跻峰 . 牛源金黄色葡萄球菌突变株的筛选、鉴定及其免疫原性的研究 , 2010,43(10):2174-2181. Magsci [本文引用: 2] <P><FONT face=Verdana>【目的】诱变牛源金黄色葡萄球菌山东分离株(zfb),筛选、鉴定弱毒性突变株,并研究其在鼠上的免疫交叉保护性。【方法】牛源金黄色葡萄球菌山东分离株zfb,经N-甲基-N'-硝基-N-亚硝基胍(MNNG)化学诱变,经生长特性、回复突变、毒力检测、LD50、多种特征性酶检测、小鼠中免疫保护性等实验比较研究了突变株与亲本株的生物学特性,筛选得到遗传性状稳定β-溶血素缺失的弱毒性突变株。【结果】弱毒性突变株Hx与亲本株相比:其β-溶血性状完全缺失,生长缓慢,耐热核酸酶、血浆凝固酶等胞外蛋白的产量减少,在活体条件下可产生荚膜,半数致死量(LD50)10-1.83<I>&#</I>8226;mL-1远低下于亲本株的10-4.33<I>&#</I>8226;mL-1。亲本株保护检测,免疫接种过的鼠的半数致死量是未接种过的6—50倍。非亲本株保护检测,免疫接种过的鼠的半数致死率是未接种过的5—60倍。【结论】突变株Hx的β-溶血素缺失,毒性减弱,对金黄色葡萄球菌攻击具有较高免疫保护性。<BR></FONT></P> HEN, WANGC F, YANGH J, HEH B, YANGS H, WANGL Q, GAOY D, ZHONGJ F . Screening an attenuated strain and immunogenicity in mice of a bovine mastitis staphylococcus aureus mutant Scientia Agricultura Sinica, 2010,43(10):2174-2181. (in Chinese) Magsci [本文引用: 2] <P><FONT face=Verdana>【目的】诱变牛源金黄色葡萄球菌山东分离株(zfb),筛选、鉴定弱毒性突变株,并研究其在鼠上的免疫交叉保护性。【方法】牛源金黄色葡萄球菌山东分离株zfb,经N-甲基-N'-硝基-N-亚硝基胍(MNNG)化学诱变,经生长特性、回复突变、毒力检测、LD50、多种特征性酶检测、小鼠中免疫保护性等实验比较研究了突变株与亲本株的生物学特性,筛选得到遗传性状稳定β-溶血素缺失的弱毒性突变株。【结果】弱毒性突变株Hx与亲本株相比:其β-溶血性状完全缺失,生长缓慢,耐热核酸酶、血浆凝固酶等胞外蛋白的产量减少,在活体条件下可产生荚膜,半数致死量(LD50)10-1.83<I>&#</I>8226;mL-1远低下于亲本株的10-4.33<I>&#</I>8226;mL-1。亲本株保护检测,免疫接种过的鼠的半数致死量是未接种过的6—50倍。非亲本株保护检测,免疫接种过的鼠的半数致死率是未接种过的5—60倍。【结论】突变株Hx的β-溶血素缺失,毒性减弱,对金黄色葡萄球菌攻击具有较高免疫保护性。<BR></FONT></P>
倪春霞, 蒲万霞, 胡永浩, 邓海平 . 奶牛乳房炎金黄色葡萄球菌凝固酶基因型研究 , 2011,44(2):417-422. Magsci [本文引用: 1] <P><FONT face=Verdana>【目的】了解上海和贵州地区引起奶牛乳房炎的金黄色葡萄球菌凝固酶基因型情况,为奶牛乳房炎的防治提供理论依据。【方法】利用16S rRNA保守序列设计引物,PCR扩增鉴定金黄色葡萄球菌,并利用凝固酶基因及其酶切产物多态性对分离鉴定出的金黄色葡萄球菌进行了凝固酶基因分型。【结果】共鉴定出78株金黄色葡萄球菌,有74株金黄色葡萄球菌扩增凝固酶基因片段,分为5个基因型和两个亚型。PCR 1型为贵州地区优势基因型,PCR 3型为上海地区优势基因型。【结论】两地区各基因型菌株分布比例有显著的地域性差异,这与两地区地理环境和养殖水平差异对病原流行传播的影响有关。<BR></FONT></P> NIC X, PUW X, HUY H, DENGH P . Research on coagulase genotyping of staphylococcus aureus isolated from bovine mastitis Scientia Agricultura Sinica, 2011,44(2):417-422. (in Chinese) Magsci [本文引用: 1] <P><FONT face=Verdana>【目的】了解上海和贵州地区引起奶牛乳房炎的金黄色葡萄球菌凝固酶基因型情况,为奶牛乳房炎的防治提供理论依据。【方法】利用16S rRNA保守序列设计引物,PCR扩增鉴定金黄色葡萄球菌,并利用凝固酶基因及其酶切产物多态性对分离鉴定出的金黄色葡萄球菌进行了凝固酶基因分型。【结果】共鉴定出78株金黄色葡萄球菌,有74株金黄色葡萄球菌扩增凝固酶基因片段,分为5个基因型和两个亚型。PCR 1型为贵州地区优势基因型,PCR 3型为上海地区优势基因型。【结论】两地区各基因型菌株分布比例有显著的地域性差异,这与两地区地理环境和养殖水平差异对病原流行传播的影响有关。<BR></FONT></P>
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