传出细胞增多
小胶质细胞
巨噬细胞
炎症
STAT6
冲程(发动机)
分辨率(逻辑)
医学
生物
免疫学
吞噬作用
神经科学
计算机科学
白细胞介素4
免疫系统
物理
体外
人工智能
热力学
生物化学
作者
Wei Cai,Xuejiao Dai,Jie Chen,Jingyan Zhao,Mingyue Xu,Lili Zhang,Boyu Yang,Wenting Zhang,Marcelo Rocha,Toshimasa Nakao,Julia Kofler,Yejie Shi,R. Anne Stetler,Xiaoming Hu,Jun Chen
出处
期刊:JCI insight
[American Society for Clinical Investigation]
日期:2019-10-17
卷期号:4 (20)
被引量:150
标识
DOI:10.1172/jci.insight.131355
摘要
Efferocytosis, or phagocytic clearance of dead/dying cells by brain-resident microglia and/or infiltrating macrophages, is instrumental for inflammation resolution and restoration of brain homeostasis after stroke. Here, we identify the signal transducer and activator of transcription 6/arginase1 (STAT6/Arg1) signaling axis as a potentially novel mechanism that orchestrates microglia/macrophage responses in the ischemic brain. Activation of STAT6 was observed in microglia/macrophages in the ischemic territory in a mouse model of stroke and in stroke patients. STAT6 deficiency resulted in reduced clearance of dead/dying neurons, increased inflammatory gene signature in microglia/macrophages, and enlarged infarct volume early after experimental stroke. All of these pathological changes culminated in an increased brain tissue loss and exacerbated long-term functional deficits. Combined in vivo analyses using BM chimeras and in vitro experiments using microglia/macrophage-neuron cocultures confirmed that STAT6 activation in both microglia and macrophages was essential for neuroprotection. Adoptive transfer of WT macrophages into STAT6-KO mice reduced accumulation of dead neurons in the ischemic territory and ameliorated brain infarction. Furthermore, decreased expression of Arg1 in STAT6-/- microglia/macrophages was responsible for impairments in efferocytosis and loss of antiinflammatory modality. Our study suggests that efferocytosis via STAT6/Arg1 modulates microglia/macrophage phenotype, accelerates inflammation resolution, and improves stroke outcomes.
科研通智能强力驱动
Strongly Powered by AbleSci AI