在Atg16l1中的克罗恩病变体增强了其通过caspase3降解
Aditya Murthy1, Yun Li1, Ivan Peng1
1Department of Immunology, Genentech, Inc., 1 DNA Way, South San Francisco, California 94080, USA.
Nature
|February 21, 2014
概括
一种常见的克罗恩病风险基因变异 (ATG16L1 T300A) 对-3裂变更敏感. 这导致自减少和病原体清除受损,有助于克罗恩病的发展.
科学领域:
- 遗传学和分子生物学
- 免疫学 免疫学 免疫学
- 胃肠病学 胃肠病学
背景情况:
- 克罗恩氏病是一种与ATG16L1基因变异 (rs2241880,Thr300Ala) 相关的炎症性肠病.
- 这种与克罗恩病相关的ATG16L1变体的精确分子影响仍然不清楚.
研究的目的:
- 为了研究ATG16L1基因中Thr300Ala (T300A) 变异的分子后果.
- 阐明caspase-3在ATG16L1的处理中的作用及其与克罗恩病病原体的关联.
主要方法:
- 在ATG16L1.1.中分析caspase裂变图案.
- 在压力条件下对人类和小鼠巨细胞进行实验 (死亡受体激活,饥饿).
- 使用携带T316A变体 (T300A的小鼠等价物) 和基因删除/突变 (Casp3) 的实验小鼠.
主要成果:
- 这种T300A变种增加了ATG16L1对caspase-3裂变的敏感性.
- 细胞应激加速了T300A/T316A ATG16L1变体的降解,从而减少了自.
- 在T316A小鼠中,Yersinia enterocolitica的清除受损,炎症反应加剧.
结论:
- 卡斯帕酶-3激活在常见的克罗恩氏风险等位基因存在时加速ATG16L1降解.
- 这种加速的降解将细胞压力,细胞亡和自功能受损与克罗恩病倾向的途径联系在一起.
- 准caspase-3或分离部位可能为克罗恩病提供治疗策略.
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