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- W3201453693 abstract "Macrophages exhibit a spectrum of activation states ranging from classical to alternative activation1. Alternatively, activated macrophages are involved in diverse pathophysiological processes such as confining tissue parasites2, improving insulin sensitivity3 or promoting an immune-tolerant microenvironment that facilitates tumour growth and metastasis4. Recently, the metabolic regulation of macrophage function has come into focus as both the classical and alternative activation programmes require specific regulated metabolic reprogramming5. While most of the studies regarding immunometabolism have focussed on the catabolic pathways activated to provide energy, little is known about the anabolic pathways mediating macrophage alternative activation. In this study, we show that the anabolic transcription factor sterol regulatory element binding protein 1 (SREBP1) is activated in response to the canonical T helper 2 cell cytokine interleukin-4 to trigger the de novo lipogenesis (DNL) programme, as a necessary step for macrophage alternative activation. Mechanistically, DNL consumes NADPH, partitioning it away from cellular antioxidant defences and raising reactive oxygen species levels. Reactive oxygen species serves as a second messenger, signalling sufficient DNL, and promoting macrophage alternative activation. The pathophysiological relevance of this mechanism is validated by showing that SREBP1/DNL is essential for macrophage alternative activation in vivo in a helminth infection model. Bidault et al. find that interleukin-4 activates SREBP1 to promote de novo lipogenesis that consumes NADPH to drive alternative activation of macrophages through the accumulation of reactive oxygen species." @default.
- W3201453693 created "2021-09-27" @default.
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- W3201453693 date "2021-09-16" @default.
- W3201453693 modified "2023-10-18" @default.
- W3201453693 title "SREBP1-induced fatty acid synthesis depletes macrophages antioxidant defences to promote their alternative activation" @default.
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- W3201453693 doi "https://doi.org/10.1038/s42255-021-00440-5" @default.
- W3201453693 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/7611716" @default.
- W3201453693 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/34531575" @default.
- W3201453693 hasPublicationYear "2021" @default.
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