期刊
REDOX BIOLOGY
卷 37, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.redox.2020.101688
关键词
Macrophage; Oxidative stress; Insulin resistance; Inflammasome; Ubiquitination
资金
- National Natural Science Foundation of China [81900268, 81970257, 81830014]
- Major Program of National Natural Science Foundation of China [91949201]
- Ministry of Science and Technology of China [2016 YFA0101100]
The E3 ubiquitin ligase FBW7 plays critical roles in multiple pathological and physiological processes. Here, we report that after high-fat diet (HFD) feeding for 16 weeks, myeloid-specific FBW7-deficient mice demonstrate increased redox stress, inflammatory responses and insulin resistance. Macrophages activation under FBW7 deficiency decreases substrate flux through the pentose phosphate pathway (PPP) to produce less equivalents (NADPH and GSH) and aggravate the generation of intracellular reactive oxygen species (ROS) in macrophages, thereby over-activating proinflammatory reaction. Mechanistically, we identify that pyruvate kinase muscle isozyme M2 (PKM2) is a new bona fide ubiquitin substrate of SCFFBW7. While challenged with HFD stress, pharmacological inhibition of PKM2 protects FBW7-deficient macrophages against production of ROS, proinflammatory reaction and insulin resistance. Intriguingly, we further find an inverse correlation between FBW7 level and relative higher H2O2 level and the severity of obesity-related diabetes. Overall, the results suggest that FBW7 can play a crucial role in modulating inflammatory response through maintaining the intracellular redox homeostasis during HFD insults.
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