Gastroenterology:变形杆菌属诱导克罗恩病患者炎症的机制研究

2020-10-20 网络 网络

变形杆菌属(Proteus spp)通过诱发炎症在克罗恩病患者的病理过程中发挥了重要作用

变形杆菌属(Proteus spp),属于革兰氏阴性兼性厌氧杆菌,与克罗恩病(CD)患者肠切除术后复发有关。近日研究人员考察了变形杆菌作为一种肠道致病菌在CD中的基因组和功能影响。
 
研究人员采用 ure 基因特异性PCR法,对来自CD患者及健康志愿者的54份粪便标本和101例肠道活检标本进行了Proteus spp.丰度检测。采用免疫荧光和电镜观察了两种不同 P. mirabilis分离株在上皮细胞中的粘附、侵袭和细胞内存在情况。通过RNAseq和KEGG通路分析细胞内基因表达谱和调控通路。 采用体外细胞培养法、常规小鼠和无菌小鼠体内培养法测定了两株 P. mirabilis 的生物学功能。
 
比对照组相比,CD 患者的粪便和结肠组织中Proteus spp.更为普遍和丰富。在 Proteus spp丰度较高的CD患者中,Fusobacterium 的丰度较高,Faecalibacterium 的丰度较低。从CD患者中分离出的24株变形杆菌均属于P. mirabilis 谱系成员。任何一种 P. mirabilis灌胃均可导致小鼠结肠炎症加重。与上皮细胞共培养表明,感染变形杆菌属后,上皮细胞的细菌粘附、侵袭、促炎细胞因子IL-18和IL-1α的产生增加,最终导致细胞坏死。分离物通过诱导关键的促炎途径发挥作用,包括NOD样受体信号、Jak-STAT信号和MAPK信号传导,并在gnotobitic小鼠中诱导了促炎基因的表达,激活了炎症相关通路。
变形杆菌属(Proteus spp)通过诱发炎症在克罗恩病患者的病理过程中发挥了重要作用。
 
原始出处:
 
Jingwan Zhang et al. Elucidation of Proteus mirabilis as a Key Bacterium in Crohn's Disease Inflammation.Gastroenterology. October 1,2020.

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    2020-10-20 肿肿

    机制研究离临床仍然有距离,不过与临床结合思考,仍然有帮助的,不能仅仅是纯临床思维,转化思维同样重要

    0

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    2020-10-20 wxl882001

    了解

    0

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    2020-10-20 ms3000000833147554

    刚碰到克罗恩,学习了

    0

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