为什么微塑料会加剧胆固醇性肝病? 通过NLRP3介导的肠道屏障完整性损伤物质
Siwen Li1, Yu Yuan1, Yuan Zeng1
1Department of Health Toxicology, Xiangya School of Public Health, Central South University, Changsha, 410013, PR China.
聚烯微塑料 (PS-MPs) 通过破坏肠道屏障并激活NLRP3炎症,使胆固醇性肝病 (CLD) 恶化. 抑制NLRP3可以减少PS-MP诱导的肝损伤和肠损伤,这表明它是治疗点.
科学领域:
- 环境健康 环境健康
- 肝病学 肝病学是一种肝病学.
- 胃肠病学 胃肠病学
背景情况:
- 微塑料 (MP) 是越来越严重的环境和公共卫生问题,在水生生态系统中发现并被生物摄入.
- 胆固醇性肝病 (CLD) 与肠道平衡有关,但MPs对CLD的影响仍未被探索.
研究的目的:
- 为了研究聚烯微塑料 (PS-MPs) 对CLD小鼠模型 (Mdr2-/-小鼠) 的影响.
- 阐明PS-MPs影响CLD进展和肠道完整性的潜在机制.
主要方法:
- 在Mdr2-/-小鼠中,PS-MPs (0.5μm,200μg/天) 受到挑战.
- 分析了肝脏和结肠组织的组织病理学,炎症标志物和蛋白质表达.
- 肝酶 (ALP,γ-GGT) 和肠道屏障蛋白质的血清水平被量化.
- 在肝酶,肠道屏障基因和炎症性细胞因子 (IL-1β) 之间进行了相关性分析.
- 使用一种特定的抑制剂 (MCC950) 评估了NOD类受体蛋白3 (NLRP3) 炎症体的作用.
主要成果:
- 在Mdr2-/-小鼠中,PS-MP暴露加剧了肝损伤,由增加的原沉积,炎症细胞透和血清ALP/γ-GGT升高表明.
- PS-MPs降低了结肠粘液细胞和下调肠道屏障蛋白 (ZO-1,奥克卢丁,克劳丁-1).
- 暴露于PS-MP与增加IL-1β和加速NLRP3炎症酶激活在结肠中相关,但不是肝脏.
- 抑制NLRP3消除了PS-MPs对肝胆损伤和肠壁完整性的有害影响.
结论:
- 通过损害肠道屏障完整性和促进NLRP3介导的结肠炎症,PS-MPs会使CLD恶化.
- NLRP3炎症酶激活是将PS-MP暴露,肠道损伤和肝病进展联系起来的关键机制.
- NLRP3代表了一个潜在的治疗点,用于减轻在CLD中暴露于微塑料的不良健康影响.
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