Mechanism of Wound Healing by Hematopoietic Stem Cells

Context: Chronic wounds are a significant clinical issue, prompting interest in stem cell-based therapies. Hematopoietic stem cells (HSCs) have demonstrated potential in enhancing wound healing through direct and paracrine mechanisms. These involve immune modulation, promoting local cell proliferation, angiogenesis, and remodeling of the extracellular matrix (ECM). Objective: This review explores the roles and mechanisms of HSCs in wound healing and addresses current limitations in knowledge and evidence. Methods: We discuss recent experimental and clinical studies examining the interactions of HSCs with the wound microenvironment, highlighting key mediators such as cytokines, growth factors, and signaling pathways that control macrophage polarization and ECM remodeling. Results: Although promising, existing data are sometimes contradictory, particularly among wound types (e.g., acute vs. diabetic ulcers). Multiple variables, such as delivery, cell source, and host environment, influence the efficacy of HSC-based therapies. Furthermore, small-scale clinical studies with limited statistical power require cautious interpretation. Conclusions: The HSCs contribute to wound healing by immunomodulatory and regenerative mechanisms. Further research is needed to define precise mechanisms, optimize therapeutic delivery, and establish clinical benefit in large trials.