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奥尔法托美丁-4+中性粒细胞在困难 Clostridioides 感染中加剧肠道上皮损伤

S Jose¹, A Huber^1,2, A Kassam^3,4,5

¹Division of Infectious Diseases, Department of Internal Medicine, Cincinnati Children's Hospital Medical Center, Cincinnati, Ohio, USA.

Infection and immunity

|January 7, 2026

概括

中性粒细胞通过破坏肠道细胞来加剧Clostridioides difficile感染 (CDI). 一种表达 Olfactomedin-4 (OLFM4) 的特定中性粒细胞子集加剧了这种损伤,突出了 CDI 的新治疗标.

科学领域:

免疫学免疫学免疫学
胃肠病学胃肠病学
细胞生物学细胞生物学

背景情况:

中性粒细胞是急性炎症中的关键免疫细胞.
结肠中性粒细胞的增加与严重的Clostridioides difficile感染 (CDI) 和组织损伤相关.
中性粒细胞加剧CDI病理的确切机制尚未完全理解.

研究的目的:

调查Olfactomedin-4表达中性粒细胞 (OLFM4+中性粒细胞) 在CDI期间恶化肠道损伤中的作用.
在CDI中识别中性粒细胞介导病理的潜在机制.

主要方法:

单细胞转录组学用于分析感染小鼠中性粒细胞基因表达.
在肠上皮细胞 (IEC) 损伤部位评估OLFM4+中性粒细胞聚合.
在感染小鼠和患者中测量血OLFM4水平.
在体外实验中使用中性粒细胞和重组OLFM4蛋白来评估毒素诱导的IEC损伤.

主要成果:

单细胞转录组显示,受感染小鼠的血中微粒细胞中Olfm4表达增加,具有脱粒化特征.
在CDI模型中,OLFM4+中性粒细胞被发现聚集在严重IEC损伤的部位.
在感染小鼠和CDI患者中,血OLFM4水平显著升高.
实验室研究表明,OLFM4+中性粒细胞和OLFM4蛋白会恶化C. difficile毒素诱导的IEC损伤.

结论:

中性粒细胞,特别是OLFM4+亚群,在CDI期间在加剧肠道上皮损伤方面发挥着重要作用.
中性粒细胞和血中的OLFM4水平升高表明它参与了CDI病理.
OLFM4+ 中性粒细胞是缓解CDI诱导的组织损伤的潜在治疗点.

关键词:

这是一种C. difficile感染.具有天生的免疫力.中性粒细胞中性粒细胞.嗅觉胺-4的使用方法单细胞转录组学单细胞转录组学

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