Hypoxia-Induced Extracellular Vesicles Derived from Human Umbilical Cord Mesenchymal Stem Cells Regulate Macrophage Polarization and Enhance Angiogenesis to Promote Diabetic Wound Healing
Summary: Researchers engineered extracellular vesicles (EVs) from human umbilical cord MSCs under hypoxia and showed that these EVs boost fibroblast and endothelial function, activate HIF-1α–VEGFA signaling, promote M2 macrophage polarization, reduce ROS, and accelerate healing in a diabetic wound model.
Key Highlights:
- Hypoxia-induced EVs (hy-EVs) improved human skin fibroblast activity and endothelial proliferation/migration versus normoxic EVs.
- Evidence of angiogenesis via increased HIF-1α, VEGFA, and CD31 expression; aligns with enhanced neovascularization in vivo.
- Immunomodulation: hy-EVs shifted macrophages from M1 (CD86) to M2 (CD206), dampening inflammatory responses at the wound site.
- Reduced oxidative stress by inhibiting ROS in fibroblasts and endothelial cells.
- In diabetic wound models, hy-EVs increased collagen deposition, angiogenesis, and overall healing metrics.
- Authors propose hy-EV cargo (miRNAs/proteins) as a basis for next-gen EV therapeutics for chronic diabetic wounds.
Keywords: extracellular vesicles, HUCMSC, hypoxia, HIF-1α, angiogenesis, macrophage polarization, reactive oxygen species, diabetic wound healing, Yongfeng Su, Junda Lu, Feiyuan Liang, Jianwen Cheng