炎症
细胞生物学
安普克
生物
化学
激酶
蛋白激酶A
免疫学
作者
Weiwei Yu,Zhen Wang,Xiafei Yu,Yonghui Zhao,Zili Xie,Kailian Zhang,Zhexu Chi,Sheng Chen,Ting Xu,Danlu Jiang,Xingchen Guo,Mobai Li,Jian Zhang,Hui Fang,Dehang Yang,Yuxian Guo,Xuyan Yang,Xue Zhang,Yingliang Wu,Wei Yang,Di Wang
标识
DOI:10.1038/s41467-022-31149-y
摘要
Immunometabolism contributes to inflammation, but how activated macrophages acquire extracellular nutrients to fuel inflammation is largely unknown. Here, we show that the plasma membrane potential (Vm) of macrophages mediated by Kir2.1, an inwardly-rectifying K+ channel, is an important determinant of nutrient acquisition and subsequent metabolic reprogramming promoting inflammation. In the absence of Kir2.1 activity, depolarized macrophage Vm lead to a caloric restriction state by limiting nutrient uptake and concomitant adaptations in nutrient conservation inducing autophagy, AMPK (Adenosine 5'-monophosphate-activated protein kinase), and GCN2 (General control nonderepressible 2), which subsequently depletes epigenetic substrates feeding histone methylation at loci of a cluster of metabolism-responsive inflammatory genes, thereby suppressing their transcription. Kir2.1-mediated Vm supports nutrient uptake by facilitating cell-surface retention of nutrient transporters such as 4F2hc and GLUT1 by its modulation of plasma membrane phospholipid dynamics. Pharmacological targeting of Kir2.1 alleviated inflammation triggered by LPS or bacterial infection in a sepsis model and sterile inflammation in human samples. These findings identify an ionic control of macrophage activation and advance our understanding of the immunomodulatory properties of Vm that links nutrient inputs to inflammatory diseases.
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