Escherichia coli and Staphylococcus aureus Differentially Regulate Nrf2 Pathway in Bovine Mammary Epithelial Cells: Relation to Distinct Innate Immune Response

被引:18
作者
Ying, Yi-Tian [1 ,2 ,3 ]
Yang, Jing [1 ,2 ,3 ]
Tan, Xun [1 ,2 ,3 ]
Liu, Rui [1 ]
Zhuang, Ying [1 ,4 ]
Xu, Jia-Xue [1 ,4 ]
Ren, Wei-Jia [1 ,2 ]
机构
[1] Zhejiang Univ, Dept Vet Med, Yuhangtang Rd 866, Hangzhou 310058, Peoples R China
[2] Zhejiang Univ, Ctr Vet Med, Yuhangtang Rd 866, Hangzhou 310058, Peoples R China
[3] Inst Prevent Vet Sci, Yuhangtang Rd 866, Hangzhou 310058, Peoples R China
[4] Hainan Inst Zhejiang Univ, Yazhou Bay Sci & Technol City, Sanya 572025, Peoples R China
关键词
bovine; mastitis; mammary epithelia cells; Nrf2; Escherichia coli; Staphylococcus aureus; NF-KAPPA-B; INFLAMMASOME ACTIVATION; KEAP1-NRF2; SYSTEM; OXIDATIVE STRESS; EXPRESSION; P62; LIPOPOLYSACCHARIDE; TOLERANCE; INVASION; PROTECTS;
D O I
10.3390/cells10123426
中图分类号
Q2 [细胞生物学];
学科分类号
071009 ; 090102 ;
摘要
Escherichia coli and Staphylococcus aureus are major mastitis causing pathogens in dairy cattle but elicit distinct immune and an inflammatory response in the udder. However, the host determinants responsible for this difference remains largely unknown. Our initial studies focused on the global transcriptomic response of primary bovine mammary epithelial cells (pbMECs) to heat-killed E. coli and S. aureus. RNA-sequencing transcriptome analysis demonstrates a significant difference in expression profiles induced by E. coli compared with S. aureus. A major differential response was the activation of innate immune response by E. coli, but not by S. aureus. Interestingly, E. coli stimulation increased transcript abundance of several genes downstream of Nrf2 (nuclear factor erythroid 2-related factor 2) that were enriched in gene sets with a focus on metabolism and immune system. However, none of these genes was dysregulated by S. aureus. Western blot analysis confirms that S. aureus impairs Nrf2 activation as compared to E. coli. Using Nrf2-knockdown cells we demonstrate that Nrf2 is necessary for bpMECs to mount an effective innate defensive response. In support of this notion, nuclear Nrf2 overexpression augmented S. aureus-stimulated inflammatory response. We also show that, unlike E. coli, S. aureus disrupts the non-canonical p62/SQSTM1-Keap1 pathway responsible for Nrf2 activation through inhibiting p62/SQSTM1 phosphorylation at S349. Collectively, our findings provide important insights into the contribution of the Nrf2 pathway to the pathogen-species specific immune response in bovine mammary epithelial cells and raise a possibility that impairment of Nrf2 activation contributes to, at least in part, the weak inflammatory response in S. aureus mastitis.
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页数:26
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