Enteric defensins are essential regulators of intestinal microbial ecology.

Enteric defensins are essential regulators of intestinal microbial ecology.
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DOI:
10.1038/ni.1825
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发表时间:
2010-01
期刊:
影响因子:
30.5
通讯作者:
--
中科院分区:
医学1区
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--
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抗菌肽是植物和动物界天然免疫的重要效应物。在哺乳动物小肠中,潘氏细胞α-防御素是有助于宿主防御肠道病原体的抗微生物肽。为了确定α-防御素是否也控制肠道微生物生态,我们分析了表达人α-防御素(DEFA 5)的小鼠和缺乏加工鼠α-防御素所需酶的小鼠的肠道微生物群。在这些互补模型中,我们检测到微生物群组成的显著α-防御素依赖性变化,但细菌总数没有变化。此外,表达DEFA 5的小鼠的节段丝状细菌明显减少,产生白细胞介素17的固有层T细胞也减少。这些数据归因于α-防御素在调节肠道微生物群组成中的新的稳态作用。
Antimicrobial peptides are important effectors of innate immunity throughout the plant and animal kingdoms. In the mammalian small intestine, Paneth cell α-defensins are antimicrobial peptides that contribute to host defense against enteric pathogens. To determine if α-defensins also govern intestinal microbial ecology, we analyzed the intestinal microbiota in mice expressing a human α-defensin (DEFA5) and in mice lacking an enzyme required for processing of murine α-defensins. We detected significant α-defensin-dependent changes in microbiota composition, but not in total bacterial numbers, in these complementary models. Furthermore, DEFA5-expressing mice had striking losses of Segmented Filamentous Bacteria and fewer interleukin 17-producing lamina propria T cells. These data ascribe a new homeostatic role for α-defensins in regulating the makeup of the commensal microbiota.
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