B cell-intrinsic MyD88 signaling prevents the lethal dissemination of commensal bacteria during colonic damage.

B cell-intrinsic MyD88 signaling prevents the lethal dissemination of commensal bacteria during colonic damage.
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DOI:
10.1016/j.immuni.2011.11.019
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发表时间:
2012-02-24
期刊:
影响因子:
32.4
通讯作者:
Yarovinsky F
Yarovinsky F
中科院分区:
医学1区
文献类型:
--
作者:
Kirkland D;Benson A;Mirpuri J;Pifer R;Hou B;DeFranco AL;Yarovinsky F

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Toll 样受体衔接蛋白 MyD88 对于哺乳动物肠道稳态的调节至关重要。在这项研究中,我们确定 Myd88 缺陷小鼠容易受到右旋糖酐硫酸钠 (DSS) 诱导的结肠损伤,这是由于肠道共生细菌不受控制的传播所致。通过抗生素治疗消除共生细菌,可以完全防止 DSS 诱导的 Myd88 缺陷小鼠死亡。通过使用细胞类型特异性 Myd88 缺陷小鼠,我们确定 B 细胞固有的 MyD88 信号通过产生 IgM 和补体介导的肠道细菌控制,在抵抗 DSS 诱导的结肠损伤中发挥核心作用。我们的研究结果表明,B 细胞中缺乏完整的 MyD88 信号传导,加上上皮完整性受损,使得共生细菌能够充当高致病性微生物,导致宿主快速死亡。
The Toll-like receptor adaptor protein MyD88 is essential for the regulation of intestinal homeostasis in mammals. In this study, we determined that Myd88-deficient mice are susceptible to colonic damage that is induced by dextran sulfate sodium (DSS) administration due to uncontrolled dissemination of intestinal commensal bacteria. The DSS-induced mortality of Myd88-deficient mice was completely prevented by antibiotic treatment to deplete commensal bacteria. By using cell type-specific Myd88-deficient mice, we established that B cell-intrinsic MyD88 signaling plays a central role in the resistance to DSS-induced colonic damage via the production of IgM and complement-mediated control of intestinal bacteria. Our results indicate that the lack of intact MyD88 signaling in B cells, coupled with impaired epithelial integrity, enables commensal bacteria to function as highly pathogenic organisms, causing rapid host death.
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