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Pro-Regenerative Hydrogel Restores Scarless Skin during Cutaneous Wound Healing.
Advanced Healthcare Materials 2017 December
The transformation of fibrotic healing process to regenerative one has great potential to fully restore wounded skin. The M2 macrophage phenotype promotes constructive tissue remodeling and instructs tissue repair in a regenerative manner. It is hypothesized that hydrogels that can establish robustness of endogenous cells to regulate M2 phenotype will promote constructive dermal remodeling. Toward this end, a series of dextran-based bioabsorbable hydrogels are developed and self-crosslinkable dextran-isocyanatoethyl methacrylate-ethylamine (DexIEME) is identified as the potential scaffold. The initial screening study revealed that DexIEME has superior biocompatibility in varying concentrations. Although DexIEME brings about low proinflammatory responses, it promotes M2 macrophage phenotype. Then the optimized hydrogel formulation is tested for acute skin injuries using both murine and porcine models. Preliminary data demonstrated that the innovative DexIEME hydrogel promotes complete skin regeneration with hair regrowth on pre-existing scars, while untreated scars remain intact. Preclinical studies further demonstrated that the DexIEME hydrogel regenerated perfect skin during deep porcine wound healing. Overall, the approach to investigate immune-modulated hydrogels yields pro-regenerative DexIEME hydrogel, which may lead to greater clinical success in treating deep dermal injury and attenuating scar formation.
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