MUC17是一种必不可少的小肠葡萄糖成分,在克罗恩氏病中被破坏
Elena Layunta1, Sofia Jäverfelt1, Fleur C van de Koolwijk1
1Department of Medical Biochemistry and Cell Biology, Institute of Biomedicine, University of Gothenburg, Box 440, 405 30 Gothenburg, Sweden.
bioRxiv : the preprint server for biology
|February 26, 2024
概括
膜粘素MUC17保护小肠免受细菌的侵害. 在克朗氏病中降低MUC17水平.
科学领域:
- 胃肠道学和免疫学
- 微生物组研究 微生物组研究
- 皮质生物学 皮质生物学
背景情况:
- 克罗恩氏病 (CD) 涉及慢性肠道炎症,但细菌-上皮相互作用尚未完全理解.
- 宿主-微生物界面上的特定分子在CD病变发生过程中的作用尚不清楚.
- 膜粘膜对肠道屏障功能至关重要,但它们在CD中的特定作用尚未得到充分研究.
研究的目的:
- 研究膜粘素MUC17在保护小肠肠道肠球细胞免受细菌相互作用中的作用.
- 在克罗恩病的背景下,探索MUC17水平,葡萄糖完整性和细菌转位之间的联系.
- 确定MUC17缺乏对肠道平衡和感染易感性的影响.
主要方法:
- 从非炎症克罗恩病患者的人体内皮质组织中分析MUC17表达.
- 产生和表征Muc17缺乏的小鼠模型.
- 在野生型和Muc17缺乏的小鼠中评估小肠细菌组成和上皮屏障功能.
- 在小鼠模型中评估细菌转位和感染易感性.
主要成果:
- 在非炎症的克罗恩氏病阴茎中观察到MUC17水平的降低,与危害的葡萄糖和增加的细菌接触相关.
- 在小鼠中,Muc17的删除导致了小肠对感染的防御功能受损,以及上皮质平衡的自发恶化.
- 缺少Muc17的小鼠表现出增加的肠外细菌转移,并且在克罗恩病患者中发现的特定细菌种群.
- 相反,Muc17删除并没有赋予对结肠炎的易感性,这表明它在小肠防御中起着特定的作用.
结论:
- MUC17是小肠上皮质防御系统对抗细菌入侵的关键组成部分.
- 缺乏MUC17可能会通过破坏屏障功能和改变微生物组,导致克罗恩病中观察到的早期上皮缺陷.
- 准MUC17或恢复其功能可能是管理克罗恩病早期阶段的新疗法策略.
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