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GUT:结肠黏液屏障的结构性减弱是溃疡性结肠炎发病机理中的早期事件

2019-11-30 不详 MedSci原创

结肠内粘液层可保护我们免受病原体和因共痛引起的炎症的影响,并已被证明在活动性UC中存在缺陷。这项研究的目的是确定潜在的组成变化,其分子背景以及对UC发病机理的潜在影响。

目的
结肠内粘液层可保护我们免受病原体和因共痛引起的炎症的影响,并已被证明在活动性UC中存在缺陷。这项研究的目的是确定潜在的组成变化,其分子背景以及对UC发病机理的潜在影响。

设计
乙状结肠活检取自患有持续炎症(n=36)或缓解(n=28)的UC患者和47例无结肠疾病的患者。从活组织检查活体内收集粘液样品,并通过纳米液相色谱-串联质谱分析它们的蛋白质组成。在部分患者中评估了粘液的渗透性和杯状细胞对微生物刺激的反应。

结果
研究人员发现核心粘液蛋白质组由少量的29种分泌/跨膜蛋白组成。在活动性UC中,包括粘蛋白MUC2(p<0.0001)在内的主要结构性粘液成分也在非发炎节段中减少。活动性UC与前哨杯状细胞数量减少和杯状细胞对微生物攻击的分泌反应减弱有关。在一部分UC患者中观察到内粘液层的渗透性异常(12/40; 30%)。穿透性粘液样品中的蛋白质组学改变包括SLC26A3根尖膜阴离子交换剂的减少,该交换剂可提供结肠粘蛋白屏障形成所需的碳酸氢根。

结论
活动性UC中核心粘液结构成分减少。这些改变与杯状细胞对微生物攻击的分泌反应的减弱有关,但独立于局部炎症而发生。因此,粘液异常可能导致UC发病。

原始出处:
Sjoerd van der Post. Et al. Structural weakening of the colonic mucus barrier is an early event in ulcerative colitis pathogenesis. Alimentary Pharmacology and Therapeutics. 2019.

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