增强的酸盐消费增加了C57BL/6J小鼠的结肠透性,通过影响肠道微生物群和激活HIF-1α
Emylle Costa-Bartuli1, Larissa Pereira Paixão1, Leticia Diniz Crepaldi1
1The metaboliZSm' grouP (ZSP group), Laboratório de Enzimologia e Controle do Metabolismo (LabECoM), Faculdade de Farmácia, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Rio de Janeiro, Brazil.
The Journal of nutritional biochemistry
|May 4, 2025
概括
在加工食品中常见的高酸盐摄入量会损害葡萄糖耐受性和肠道健康. 这项研究表明,增加酸盐消费会改变肠道微生物群,并促进炎症,即使短期暴露.
科学领域:
- 生物化学 生物化学
- 微生物学 微生物学
- 生理学 生理学 生理学
背景情况:
- 酸盐是一种广泛使用的食品添加剂,被归类为安全,没有消费限制.
- 增加酸盐摄入量与生理影响有关,包括降低葡萄糖耐受性和全身炎症.
- 最近的研究表明,增加酸盐消费对代谢健康的潜在不良影响.
研究的目的:
- 调查增强的酸盐对小鼠结肠健康和肠道微生物群的影响.
- 为了确定高酸盐摄入量引起的持续时间相关的生理和微生物变化.
- 阐明酸盐对新陈代谢和炎症的影响的分子机制.
主要方法:
- 小鼠被食标准饮食,并补充了通常的酸盐 (40 mg/g食物) 的两倍,持续24小时或12周.
- 评估结肠组织的粘膜屏障完整性,透性和炎症标志物.
- 分析了肠道微生物群的组成,并评估了葡萄糖耐受性和关键代谢标志物.
主要成果:
- 在小鼠中,增强的酸盐消费降低了葡萄糖耐受性,稀释了粘膜屏障,增加了结肠透性和炎症.
- 观察到肠道微生物群的显著变化,其特点是细菌负载增加和多样性减少,表明肥胖性特征.
- 酸盐载体SLC13a5,HIF-1α和ATP的升调:酸盐酶表明促进了细胞质酸盐代谢.
结论:
- 高度酸盐消费对宿主生理学,肠道屏障功能和微生物社区结构产生负面影响.
- 该研究表明,细胞酸-CoA的形成增加,促进脂质合成和表观遗传修饰,作为一个关键机制.
- 这些发现突出了与饮食中酸盐摄入量高相关的潜在健康风险,挑战了其"普遍认为安全"的地位.
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