Abstract
Emerging evidence suggests that amino acids dictate the effector functions of immune cells; however, whether and how phenylalanine (Phe) orchestrates the polarization of macrophages is not understood. Here, we determined that Phe attenuated lipopolysaccharide (LPS) and P. multocida serotype A strain CQ2 (PmCQ2) infection-induced inflammation in vivo. Furthermore, we demonstrated that Phe inhibited the production of interleukin (IL)-1β and tumor necrosis factor (TNF)-α in proinflammatory (M1) macrophages. Phe reprogrammed the transcriptomic and metabolic profiles and enhanced oxidative phosphorylation in M1 macrophages, which reduced the activation of caspase-1. Notably, the valine-succinyl-CoA axis played a critical role in Phe-mediated inhibition of IL-1β production in M1 macrophages. Taken together, our findings suggest that manipulating the valine-succinyl-CoA axis provides a potential target for preventing and/or treating macrophage-related diseases.
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This work was supported by the National Natural Science Foundation of China (32225047, 31922079) and the Laboratory of Lingnan Modern Agriculture Project (NT2021005).
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Compliance and ethics The author(s) declare that they have no conflict of interest. The animal study was reviewed and approved by the Laboratory Animal Ethical Commission of the South China Agricultural University.
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Zhang, Q., Chen, S., Guo, Y. et al. Phenylalanine diminishes M1 macrophage inflammation. Sci. China Life Sci. 66, 2862–2876 (2023). https://doi.org/10.1007/s11427-022-2296-0
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DOI: https://doi.org/10.1007/s11427-022-2296-0