Mesenchymal stem cell-derived small extracellular vesicles-loaded GelMA microspheres enhance diabetic wound healing by promoting M2 macrophage polarization through p38 MAPK inhibition

间充质干细胞来源的载有小细胞外囊泡的GelMA微球通过抑制p38 MAPK促进M2巨噬细胞极化，从而增强糖尿病伤口愈合。