金黄色葡萄球菌(S。金黄色葡萄球菌)是惹起奶牛乳房炎的主要病原菌之一。目前的工作主要集中在金黄色葡萄球菌感染或其他因素引起的MAC-T细胞凋亡诱导途径。然而,金黄色葡萄球菌感染的MAC-T细胞的生理特征和产生的mRNA表达谱仍然未知,特别是在不同的耐药菌株的情况下。使用耐甲氧西林金黄色葡萄球菌(MRSA)和耐甲氧西林金黄色葡萄球菌(MSSA)菌株感染MAC-T细胞以研究该问题。附着力,评估MRSA感染组和MSSA感染组的侵袭和凋亡能力。8小时后,对MRSA感染和MSSA感染的未感染MAC-T细胞作为对照进行RNA测序.结果表明,MRSA感染和MSSA感染对MAC-T细胞的粘附和侵袭能力随感染时间先升高后降低,在8小时达到峰值。MSSA感染的粘附和侵袭率大大低于MRSA感染的粘附和侵袭率,MSSA感染组的侵袭率几乎不存在。然后MAC-T细胞的凋亡率随着感染时间的增加而增加。转录组分析显示,在MRSA感染和MSSA感染的MAC-T细胞中,有549个差异表达的mRNA和390个差异表达的mRNA,分别,与未感染的MAC-T细胞相比。根据GO分析,这些差异表达的基因参与了免疫反应,炎症,凋亡,和其他过程。京都基因和基因组百科全书(KEGG)分析表明以下途径与粘附有关,侵袭性炎症和凋亡,包括AMPK,FOXO,HIF-1,IL-17,JAK-STAT,MAPK,mTOR,NF-κB,p53,PI3K-Akt,TNF,Toll样受体,Rap1,RAS,朊病毒病,细菌侵入上皮细胞的途径。我们发现来自41个KEGG富集途径的86个DEGs与粘附相关,入侵,凋亡,和炎症,所有这些都与MAC-T细胞对MRSA和MSSA感染的抗性有关。这项研究为了解不同耐药金黄色葡萄球菌对奶牛乳腺上皮细胞的影响提供了有用的数据,并有助于预防乳品行业的乳腺炎。
Staphylococcus aureus (S. aureus) is one of the main pathogens causing mastitis in dairy cows. The current work mainly focuses on the pathway of apoptosis induction in MAC-T cells caused by S. aureus infection or other factors. However, the physiological characteristics of S. aureus infected MAC-T cells and the resulting mRNA expression profile remain unknown particularly in the case of diverse drug resistant strains. Methicillin-resistant S. aureus (MRSA) and methicillin-susceptible S. aureus (
MSSA) strains were used to infect MAC-T cells to investigate this issue. The adhesion, invasion and apoptosis ability of MRSA-infected group and
MSSA-infected group was assessed over time (2, 4, 6, 8, and 12 h). After 8 h, the RNA sequencing was conducted on the MRSA-infected and the
MSSA-infected with uninfected MAC-T cells as controls. The results showed that the adhesion and invasion ability of MRSA-infected and
MSSA-infected to MAC-T cells increased and then decreased with infection time, peaking at 8 h. The adhesion and invasion rates of the MSSA-infected were substantially lower than those of the MRSA-infected, and the invasion rate of the
MSSA-infected group was nearly non-existent. Then the apoptosis rate of MAC-T cells increased as the infection time increased. The transcriptome analysis revealed 549 differentially expressed mRNAs and 390 differentially expressed mRNAs in MRSA-infected and MSSA-infected MAC-T cells, respectively, compared to the uninfected MAC-T cells. According to GO analysis, these differentially expressed genes were involved in immune response, inflammation, apoptosis, and other processes. The Kyoto Encyclopedia of Genes and Genomes (KEGG) analysis indicated the following pathways were linked to adhesion, invasion inflammation and apoptosis, including AMPK, FOXO, HIF-1, IL-17, JAK-STAT, MAPK, mTOR, NF-κB, p53, PI3K-Akt, TNF, Toll-like receptor, Rap1, RAS, prion disease, the bacterial invasion of epithelial cells pathway. We found 86 DEGs from 41 KEGG-enriched pathways associated with adhesion, invasion, apoptosis, and inflammation, all of which were implicated in MAC-T cells resistance to MRSA and MSSA infection. This study offers helpful data toward understanding the effect of different drug-resistant S. aureus on dairy cow mammary epithelial cells and aid in the prevention of mastitis in the dairy industry.