RESUMO
PURPOSE: The aim of this study was to examine the effects of silk fibroin film on wound healing of cutaneous burn in hairless mice by using microscopic findings and stem cell markers (nestin, cytokeratin 15) and ki-67 proliferation marker. METHODS: Each mouse received two burns at the dorsal area by applying a metal rod heated with boiling water. Burn wound sites were dressed with Silk Fibroin Film and duoderm (SF group), Aquacel hydrofiber and duoderm (AC group) and duoderm only (Control group). All groups were covered externally with duodermas adhesive bands. Those mice were sacrificed at zero, two, seven, fourteen and twenty one days after burn. Histological findings and immunohistochemical staining for stem cell markers were observed. RESULTS: In SF group, inflammatory cell infiltration, formation of granulation tissue and inflammatory foci are greater than in AC and control group. Those factors appear to enhance mesenchymal stem cell markers such as nestin. Finally mesenchymal tissue regeneration was enhanced. In addition, the length of ki-67 expressed re-generating epithelium, which appeared to be associated with epithelial regeneration, was the longest in SF group. CONCLUSION: The results show that the wound healing effect of SF is the best among other treatment materials including AC in the experimental group and duoderm in the control group through mesenchymal regeneration and epithelial regeneration which are essential factors for wound healing.
