The Crohn's disease: associated ATG16L1 variant and Salmonella invasion.

The Crohn's disease: associated ATG16L1 variant and Salmonella invasion.
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DOI:
10.1136/bmjopen-2013-002790
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发表时间:
2013-06-20
期刊:
影响因子:
2.9
通讯作者:
Boone DL
Boone DL
中科院分区:
医学3区
文献类型:
--
作者:
Messer JS;Murphy SF;Logsdon MF;Lodolce JP;Grimm WA;Bartulis SJ;Vogel TP;Burn M;Boone DL

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核心自噬基因ATG 16 L1中的一种常见遗传编码变异与克罗恩病(CD)易感性增加相关。该变体编码ATG 16 L1中的氨基酸变化,使得位置300处的苏氨酸被丙氨酸取代(ATG 16 L1 T300 A)。这种变异如何导致CD风险增加尚不清楚,但对转染细胞系和基因靶向小鼠的研究表明,ATG 16 L1是自噬、白细胞介素-1-β控制和细胞内微生物自噬清除所必需的。此外,对表达ATG 16 L1 T300 A的人细胞的研究表明,该变体减少了细胞内微生物的自噬清除。我们证明,使用体细胞基因靶向的人类细胞,ATG 16 L1 T300 A变体赋予保护免受沙门氏菌的细胞入侵。此外,我们发现ATG 16 L1缺陷型细胞对细菌入侵具有抗性。这些结果表明,细胞表达的ATG 16 L1促进细菌的入侵和CD相关的ATG 16 L1 T300 A变异体可能会提供保护免受细菌感染。
A common genetic coding variant in the core autophagy gene ATG16L1 is associated with increased susceptibility to Crohn's disease (CD). The variant encodes an amino acid change in ATG16L1 such that the threonine at position 300 is substituted with an alanine (ATG16L1 T300A). How this variant contributes to increased risk of CD is not known, but studies with transfected cell lines and gene-targeted mice have demonstrated that ATG16L1 is required for autophagy, control of interleukin-1-β and autophagic clearance of intracellular microbes. In addition, studies with human cells expressing ATG16L1 T300A indicate that this variant reduces the autophagic clearance of intracellular microbes. We demonstrate, using somatically gene-targeted human cells that the ATG16L1 T300A variant confers protection from cellular invasion by Salmonella. In addition, we show that ATG16L1-deficient cells are resistant to bacterial invasion. These results suggest that cellular expression of ATG16L1 facilitates bacterial invasion and that the CD-associated ATG16L1 T300A variant may confer protection from bacterial infection.
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