在实验性败血症中,CRAMP对肠-大脑轴的影响
Ewerton Vinícius Macarini Bruzaferro1, Thais Martins de Lima1, Suely Kubo Ariga1
1Laboratório de Emergências Clínicas, Faculdade de Medicina, Universidade de São Paulo, São Paulo, Brazil.
Immunology letters
|August 9, 2024
概括
缺少cathelicidin抗微生物 (CRAMP) 可能会防止因败血症引起的脑损伤和失生症. 与野生类型小鼠相比,CRAMP淘汰小鼠在败血症挑战后显示出减少炎症和改变肠道微生物群.
科学领域:
- 微生物学 微生物学
- 免疫学 免疫学 免疫学
- 神经科学是一个神经科学.
背景情况:
- 肠道微生物群,肠道上皮和粘膜形成了对病原体的关键防御.
- 肠道细菌的不平衡,可导致病原体转移,免疫调节失调和败血症.
- 抗微生物,如cathelicidin抗微生物 (CRAMP),是先天免疫的关键组成部分,在感染期间在炎症中发挥复杂的作用.
研究的目的:
- 调查CRAMP在炎症反应,脑组织损伤和败血症期间肠道微生物群变化的作用.
- 评估CRAMP缺乏症在败血症小鼠模型中的保护作用.
主要方法:
- 在野生类型和CRAMP淘汰赛小鼠中诱导多微生物败血症的结和穿孔 (CLP) 程序.
- 在脑组织中对炎症标记物 (S100A8,S100A9) 的定量基因表达分析.
- 评估大脑组织中的蛋白质度.
- 16S rRNA测序或类似的方法来分析肠道微生物组成的变化.
主要成果:
- 与CLP后的野生型小鼠相比,CRAMP淘汰小鼠在前额叶皮质,海马体和小脑中表现出S100A8和S100A9的较低基因表达.
- 虽然这些标记物的蛋白质水平保持不变,但基因表达的差异表明CRAMP缺乏小鼠的神经炎症减少.
- 野生类型的小鼠在CLP后24小时内显示出大肠杆菌,乳杆菌和肠杆菌的增加,这表明显著的肠道失生症,这种失生症在CRAMP淘汰小鼠中不那么明显.
结论:
- 在这种败血症模型中,CRAMP的缺失似乎具有保护作用,可能通过减轻神经炎症和肠道失生症.
- 这些发现强调了CRAMP在败血症中的复杂作用,并表明CRAMP缺乏可能是治疗点.
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