Abstract
Mannose is a naturally occurring sugar widely consumed in the daily diet; however, mechanistic insights into how mannose metabolism affects intestinal inflammation remain lacking. Herein, we reported that mannose supplementation ameliorated colitis development and promoted colitis recovery. Macrophage-secreted inflammatory cytokines, particularly TNF-α, induced pathological endoplasmic reticulum stress (ERS) in intestinal epithelial cells (IECs), which was prevented by mannose via normalization of protein N-glycosylation. By preserving epithelial integrity, mannose reduced the inflammatory activation of colonic macrophages. On the other hand, mannose directly suppressed macrophage TNF-α production translationally by reducing the glyceraldehyde 3-phosphate level, thus promoting GAPDH binding to TNF-α mRNA. Additionally, we found dysregulated mannose metabolism in the colonic mucosa of patients with inflammatory bowel disease. Finally, we revealed that activating PMM2 activity with epalrestat, a clinically approved drug for the treatment of diabetic neuropathy, elicited further sensitization to the therapeutic effect of mannose. Therefore, mannose metabolism prevents TNF-α-mediated pathogenic crosstalk between IECs and intestinal macrophages, thereby normalizing aberrant immunometabolism in the gut.
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Data availability
All data associated with this study are presented in the paper or Supplementary Materials and are available from the corresponding author upon reasonable request.
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Funding
This work was supported by the National Natural Science Foundation of China (82271862 and 81873418 to YK, 82171730 to PX, 81970484 to QC), the Zhejiang Provincial Ten Thousand Program for Leading Talents of Science and Technology Innovation (2021R52015 to YK), and the Natural Science Foundation of Zhejiang Province (LY20H160032 to PX, LQ21H090064 to TP).
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Conceptualization: PX, YK. Methodology: QC, ZH, HZ, PX, YK, HC, XZ. Investigation: ZH, HZ, JL, TP, RTM, KG, MS, PX. Visualization: ZH, HZ, JL, PX. Funding acquisition: TP, PX, QC, YK. Project administration: PX, YK, XZ, HC, QC. Supervision: PX, YK, XZ, QC. Writing—original draft: ZH, JL, PX, RTM, YK. Writing—review and editing: ZH, JL, PX, RTM, YK.
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Xiao, P., Hu, Z., Lang, J. et al. Mannose metabolism normalizes gut homeostasis by blocking the TNF-α-mediated proinflammatory circuit. Cell Mol Immunol 20, 119–130 (2023). https://doi.org/10.1038/s41423-022-00955-1
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DOI: https://doi.org/10.1038/s41423-022-00955-1
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