Listeria Adhesion Protein Induces Intestinal Epithelial Barrier Dysfunction for Bacterial Translocation.

Listeria Adhesion Protein Induces Intestinal Epithelial Barrier Dysfunction for Bacterial Translocation.
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DOI:
10.1016/j.chom.2018.03.004
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发表时间:
2018-04-11
影响因子:
30.3
通讯作者:
Bhunia AK
Bhunia AK
中科院分区:
医学1区
文献类型:
--
作者:
Drolia R;Tenguria S;Durkes AC;Turner JR;Bhunia AK

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肠上皮细胞是抵御肠道病原体的第一道防线,但单核细胞增生李斯特菌等细菌病原体可以突破这一屏障。我们发现李斯特菌粘附蛋白(LAP)会诱导肠上皮屏障功能障碍,从而促进细菌易位。这些破坏归因于促炎细胞因子 TNF-α 和 IL-6 的产生,在接受 WT 和缺乏表面侵袭蛋白 Internalin A (ΔinlA) 的同基因菌株(但不是 lap− 突变体)攻击的小鼠中观察到这种情况。此外,在与其表面受体 Hsp60 结合后,LAP 激活典型的 NF-κB 信号传导,通过上皮连接蛋白 claudin-1、occludin 和 E-cadherin 的细胞重新分布,促进肌球蛋白轻链激酶 (MLCK) 介导的上皮屏障打开。细胞中 MLCK 或 NF-κB 的药理学抑制或小鼠中 MLCK 的基因消除可防止连接蛋白的错误定位和单核细胞增生利斯特氏菌易位。因此,单增李斯特氏菌利用 LAP 来利用上皮防御并穿过肠上皮屏障。病原体单核细胞增生李斯特氏菌在感染过程中穿过肠道屏障。德罗利亚等人。表明单增李斯特氏菌利用李斯特菌粘附蛋白(LAP)来利用上皮先天防御并诱导肠道屏障功能障碍。 LAP 诱导 NF-κB 和 MLCK 的激活,导致上皮连接蛋白的细胞重新分布和细菌易位。
Intestinal epithelial cells are the first line of defense against enteric pathogens, yet bacterial pathogens, such as Listeria monocytogenes, can breach this barrier. We show that Listeria adhesion protein (LAP) induces intestinal epithelial barrier dysfunction to promote bacterial translocation. These disruptions are attributed to the production of pro-inflammatory cytokines TNF-α and IL-6, which is observed in mice challenged with WT and isogenic strains lacking the surface invasion protein Internalin A (ΔinlA), but not a lap− mutant. Additionally, upon engagement of its surface receptor Hsp60, LAP activates canonical NF-κB signaling, facilitating myosin light-chain kinase (MLCK)-mediated opening of the epithelial barrier via cellular redistribution of the epithelial junctional proteins claudin-1, occludin, and E-cadherin. Pharmacological inhibition of MLCK or NF-κB in cells or genetic ablation of MLCK in mice prevents mislocalization of junctional proteins and L. monocytogenes translocation. Thus, L. monocytogenes uses LAP to exploit epithelial defenses and cross the intestinal epithelial barrier. The pathogen Listeria monocytogenes crosses the intestinal barrier during infection. Drolia et al. show that L. monocytogenes employs Listeria adhesion protein (LAP) to exploit epithelial innate defenses and induce intestinal barrier dysfunction. LAP induces activation of NF-κB and MLCK, resulting in cellular redistribution of epithelial junction proteins and bacterial translocation.
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