微质中的细菌酸糖信号传递:通过NF-κB/MAPK通路由MDP激活
Julia Spielbauer1, Elliot J Glotfelty2, Heela Sarlus3
1Department of Neuroscience, Karolinska Institutet, 171 77 Stockholm, Sweden.
Brain, behavior, and immunity
|July 6, 2024
概括
肠道细菌碎片称为muramyl dipeptide (MDP) 向大脑发出信号,影响微质细胞. 这项研究揭示了MDP如何影响微质基因表达和细胞因子释放,影响大脑炎症.
科学领域:
- 神经免疫学 神经免疫学
- 微生物学 微生物学
- 分子生物学分子生物学
背景情况:
- 细菌酸盐 (PGN) 碎片,特别是muramyl dipeptide (MDP),被认为是肠道微生物群的信号分子.
- 来自肠道微生物群的MDP可以转移到大脑,影响神经发育和行为.
- 通过MDP影响中枢神经系统 (CNS) 的确切机制尚未完全理解.
研究的目的:
- 调查MDP在生理学上相关剂量的对微质细胞的影响.
- 阐明参与MDP诱导的微质反应的分子通路.
- 探索微质信号在肠道微生物群-大脑轴中的作用.
主要方法:
- 用不同剂量的MDP治疗不朽化微质细胞 (IMG) 和初级微质培养物.
- 对微质基因表达的分析,包括C-C 基因化学因连接物5 (CCL5/RANTES),TNF-α和IL-1β.
- 研究NF-κB和MAPK信号通路,包括NF-κB p65转位和SB202190.0的影响.
主要成果:
- 从生理上相关的MDP剂量迅速改变微质基因表达,并诱导细胞因子/化学因子分泌.
- 低剂量的MDP特别增加了CCL5/RANTES的表达,而较高剂量则诱导了促炎性细胞因子TNF-α和IL-1β.
- MDP触发NF-κB p65核转位,这取决于MAPK p38的信号传输.
结论:
- 中枢神经系统中MDP水平显著影响微质功能.
- 微质CCL5可能会调解MDP诱导的突触基因表达的变化.
- MDP通过肠道微生物群-大脑轴作为早期大脑炎症过程的潜在调解者.
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