在肥胖症中,Sirtuin 1通过Ido1通路调节树突细胞的表型和功能
Jean de Lima1, Jefferson Antônio Leite1, Paulo José Basso1
1Department of Immunology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil.
Cell death & disease
|October 18, 2024
概括
肥胖症中的Sirtuin 1 (SIRT1) 缺乏会损害树突细胞 (DC) 功能,并促进炎症. 减少的SIRT1影响DC代谢和kynurenine通路,驱动促炎性T细胞反应.
科学领域:
- 免疫学 免疫学 免疫学
- 代谢性疾病 代谢性疾病
- 细胞生物学 细胞生物学
背景情况:
- 肥胖是一种慢性炎症状态,涉及免疫细胞的激活.
- Sirtuin 1 (SIRT1) 是一种组织素脱乙酶,调节免疫细胞的功能.
- 树突细胞 (DCs) 是弥合先天性和适应性免疫的关键.
研究的目的:
- 调查SIRT1在树突细胞 (DC) 现型和肥胖期间的功能中的作用.
- 探索SIRT1对DC中二二氧化酶1 (Ido1) 途径的影响.
- 了解SIRT1如何调节肥胖症中DC介导的T细胞两极化.
主要方法:
- 对来自肥胖和瘦小鼠的骨髓衍生DCs (BMDCs) 的分析.
- 细胞代谢 (OXPHOS,ECAR) 和表面标记物表达的评估 (MHCII类,CD86,CD40).
- 测量细胞因子分泌 (IL-12p40,TGF-β) 和 kynurenine 通路活动.
- 染色体可访问性分析 (ATAC-seq) 和基因表达特征分析.
- 使用了在树突细胞 (SIRT1∆) 中有条件淘汰Sirt1的小鼠.
主要成果:
- 肥胖小鼠在BMDC中表现出SIRT1活性降低.
- 来自肥胖小鼠的BMDC显示了新陈代谢变化 (增加OXPHOS/ECAR) 和促炎性标志物.
- 基努瑞宁通路活性下降,与SIRT1和PPARγ调节的Ido1表达减少有关.
- 在肥胖的BMDC中,Sirt1位点和较低Sirt1/Pparg表达的染色质可访问性降低.
- 在DC中SIRT1缺陷加剧了与肥胖相关的炎症表型.
结论:
- SIRT1对于维持正常的DC新陈代谢和功能至关重要,特别是通过 kynurenine 途径.
- 肥胖症中SIRT1活性降低有助于DC功能障碍和促炎性T细胞两极分化.
- 在DC中准SIRT1可能为肥胖相关的炎症提供治疗策略.
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