离体冻伤模型创面愈合过程中基质细胞衍生因子1促表皮干细胞迁移的研究

Objective To study the promotion effect of stromal cell-derived factor 1 (SDF-1) on the migration of epidermal stem cells (ESC) in the healing process of frostbite-wound model ex vivo. Methods A three-dimensional model of full-thickness frostbite of skin was constructed (with slot-like wound) out of skin equivalent. The expression of SDF-1 in wound stroma was observed with immunohisto-chemistry staining on post injury days (PID) 3 and 7. The model frostbite wounds were divided into control group (treated with PBS 50 μL per wound) , SDF-1 group (treated with 100 ng/mL SDF-1, 50 μL per wound) , and AMD3100 group [treated with 100 ng/mL AMD3100 (50 μL per wound) for 30 minutes, and then SDF-1 50 μL was added per wound]. The redistribution of ESC around wound was observed. Results The expression of SDF-1 in wound stroma increased gradually on PID 3 and 7. Compared with those in control and AMD3100 groups, there were more ESC and epithelial cell layers, and more integrin β1-positive cells appeared at the basal layer of wound in SDF-1 group, and some of the positive cells migrated upward to epidermis. Conclusions SDF-1 contributes to wound repair through promoting ESC to migrate toward and gather around wound edge. This may be one of the mechanisms of ESC participating in wound repair.

Promotion effect of stromal cell-derived factor 1 on the migration of epidermal stem cells in the healing process of frostbite-wound model ex vivo