α-Ketoglutarate accelerates cutaneous wound healing through modulating the epithelial-fibroblast niche.

Wound healing is a highly dynamic and metabolically demanding process. However, the primary drivers of metabolic alterations involved in this process remain incompletely understood. Here, we employed multiomics profiling of clinical samples to investigate metabolic alterations during wound healing. Our analyses revealed significant activation of the TCA cycle and identified α-ketoglutarate (αKG) as a central regulator orchestrating the reparative phase. Systemic administration of αKG promoted wound closure and re-epithelialization, characterized by enhanced neo-tissue formation with an extended epithelial tongue. Mechanistically, αKG promoted cell proliferation via the cell cycle pathway and enhanced fibroblast-derived TGF-β signaling to induce epithelial-mesenchymal transition-like programs in epithelial cells. To address the spatial metabolic heterogeneity, we developed a transdermal MN platform based on gelatin methacryloyl for localized αKG delivery, further accelerating tissue repair. Collectively, these findings identify αKG as a metabolic driver of wound repair, reveal its dual role in modulating the epithelial-fibroblast microenvironment, and introduce a targeted bioengineering strategy with translational potential for both acute and chronic wound management.