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The Role of Mesenchymal Stem Cells in the Regenerative Wound Healing Phenotype.

BACKGROUND: Mesenchymal stem cells (MSCs) are key to regenerative wound healing. MSCs have spatial memory and respond to local environment. MSCs orchestrate wound repair by: (1) structural repair via cellular differentiation; (2) immune-modulation; (3) secretion of growth factors that drive neovascularization and re-epithelialization; and (4) mobilization of resident stem cells.

THE PROBLEM: Autologous bone-marrow-derived cells and MSCs demonstrate improved healing and tissue-integrity in animal models and clinical trials. However, the effects are variable and the mechanisms of MSC-mediated wound healing are not fully understood. The mammalian MSC niche and signaling sequences and factors affecting their homing, differentiation, viability, and safety need to be characterized to get full benefits of MSC cellular therapy.

BASIC/CLINICAL SCIENCE ADVANCES: MSCs can be isolated from bone-marrow, and less-invasive tissues such as adipose, gingiva, muscle, and umbilical cord, with similar functional effects. However, isolation, culture conditions, and markers used to identify and trace the lineage of these MSCs have not been standardized, which is crucial to determine the extent to which MSCs act as multipotent stem cells or sources of secreted factors in wounds.

CLINICAL CARE RELEVANCE: In chronic nonhealing wounds, where efficacy of conventional therapies is unsatisfactory, autotransplantation of MSCs could accelerate wound healing, promote regeneration and restoration of tissue integrity, and reduce recurrence of wounds at characteristically predisposed sites.

CONCLUSION: Regenerative medicine and novel wound therapies using autologous stem cells holds great promise for clinical management of difficult wounds. The ideal candidate stem cells can be used to repopulate the wound bed to mediate appropriate epidermal and dermal regeneration and promote efficient wound repair, while modulating the immune system to prevent infection.

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