A Novel TLR4-SYK Interaction Axis Plays an Essential Role in the Innate Immunity Response in Bovine Mammary Epithelial Cells
文献类型: 外文期刊
作者: Yang, Fan 1 ; Yuan, Lu 1 ; Xiang, Minghui 1 ; Jiang, Qiang 1 ; Zhang, Manling 1 ; Chen, Fanghui 1 ; Tong, Jie 2 ; Huang, Jinming 4 ; Cai, Yafei 1 ;
作者机构: 1.Nanjing Agr Univ, Coll Anim Sci & Technol, Nanjing 210095, Peoples R China
2.Bengbu Med Coll, Dept Human Anat, Bengbu 233030, Peoples R China
3.Bengbu Med Coll, Key Lab Cardiovasc & Cerebrovasc Dis, Bengbu 233030, Peoples R China
4.Shandong Acad Agr Sci, Inst Anim Sci & Vet Med, Jinan 250100, Peoples R China
关键词: TLR4-SYK interaction axis; mastitis; bMECs; dairy cattle
期刊名称:BIOMEDICINES ( 影响因子:4.7; 五年影响因子:4.9 )
ISSN:
年卷期: 2023 年 11 卷 1 期
页码:
收录情况: SCI
摘要: Mammary gland epithelium, as the first line of defense for bovine mammary gland immunity, is crucial in the process of mammary glands' innate immunity, especially that of bovine mammary epithelial cells (bMECs). Our previous studies successfully marked SYK as an important candidate gene for mastitis traits via GWAS and preliminarily confirmed that SYK expression is down-regulated in bMECs with LPS (E. coli) stimulation, but its work mechanism is still unclear. In this study, for the first time, in vivo, TLR4 and SYK were colocalized and had a high correlation in mastitis mammary epithelium; protein-protein interaction results also confirmed that there was a direct interaction between them in mastitis tissue, suggesting that SYK participates in the immune regulation of the TLR4 cascade for bovine mastitis. In vitro, TLR4 also interacts with SYK in LPS (E. coli)-stimulated or GBS (S. agalactiae)-infected bMECs, respectively. Moreover, TLR4 mRNA expression and protein levels were little affected in bMECs(SYK-) with LPS stimulation or GBS infection, indicating that SYK is an important downstream element of the TLR4 cascade in bMECs. Interestingly, IL-1 beta, IL-8, NF-kappa B and NLRP3 expression in LPS-stimulated or GBS-infected bMECs(SYK-) were significantly higher than in the control group, while AKT1 expression was down-regulated, implying that SYK could inhibit the IL-1 beta, IL-8, NF-kappa B and NLRP3 expression and alleviate inflammation in bMECs with LPS and GBS. Taken together, our solid evidence supports that TLR4/SYK/NF-kappa B signal axis in bMECs regulates the innate immunity response to LPS or GBS.
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