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oai:repisalud.isciii.es:20.500.12105/146832025-04-01T10:21:38Zcom_20.500.12105_19604com_20.500.12105_2051com_20.500.12105_15322col_20.500.12105_19605col_20.500.12105_16960

00925njm 22002777a 4500 dc Acin-Perez, Rebeca author Iborra, Salvador author Martí-Mateos, Yolanda author Cook, Emma CL author Conde-Garrosa, Ruth author Petcherski, Anton author Muñoz, Mª Del Mar author Martínez de Mena, Raquel author Krishnan, Karthickeyan Chella author Jiménez, Concepción author Bolaños, Juan Pedro author Laakso, Markku author Lusis, Aldon J author Shirihai, Orian S author Sancho, David author Enriquez, Jose Antonio author 2020-09 Proinflammatory macrophages are key in the development of obesity. In addition, reactive oxygen species (ROS), which activate the Fgr tyrosine kinase, also contribute to obesity. Here we show that ablation of Fgr impairs proinflammatory macrophage polarization while preventing high-fat diet (HFD)-induced obesity in mice. Systemic ablation of Fgr increases lipolysis and liver fatty acid oxidation, thereby avoiding steatosis. Knockout of Fgr in bone marrow (BM)-derived cells is sufficient to protect against insulin resistance and liver steatosis following HFD feeding, while the transfer of Fgr-expressing BM-derived cells reverts protection from HFD feeding in Fgr-deficient hosts. Scavenging of mitochondrial peroxides is sufficient to prevent Fgr activation in BM-derived cells and HFD-induced obesity. Moreover, Fgr expression is higher in proinflammatory macrophages and correlates with obesity traits in both mice and humans. Thus, our findings reveal the mitochondrial ROS-Fgr kinase as a key regulatory axis in proinflammatory adipose tissue macrophage activation, diet-induced obesity, insulin resistance and liver steatosis. Nat Metab. 2020; 2(9):974-988. 10.1038/s42255-020-00273-8 2522-5812 Nature metabolism 32943786  http://hdl.handle.net/20.500.12105/14683 Fgr kinase is required for proinflammatory macrophage activation during diet-induced obesity.