摘要目的 观察基质金属蛋白酶9(matrixmetalloproteinase 9,MMP 9)高表达对大鼠皮肤成纤维细胞生物学行为的影响,以阐述其在糖尿病足伤口愈合中的可能机制.方法 本研究在中山大学孙逸仙纪念医院内分泌专科实验室完成.大鼠皮肤成纤维细胞与高糖(22 mmol/L)+高同型半胱氨酸(100 μmol/L)联合孵育建立体外MMP 9高表达细胞模型,另设正糖(5.5 mmol/L)孵育对照组.Realtime PCR、ELISA和明胶酶谱法检测MMP 9 mRNA、蛋白表达量及活性,流式细胞仪检测细胞增殖功能,CCK-8检测细胞活力,ELISA法检测细胞胶原(羟脯氨酸)分泌能力、划痕实验评价细胞横向迁移能力、Transwell法评价细胞纵向迁移能力.计量数据以均数±标准差(x-±s)表示,两组间均数的比较采用成组t检验,以P ＜0.05为差异具有统计学意义.结果 与对照组比较,MMP 9高表达组大鼠皮肤成纤维细胞的MMP 9 mRNA、蛋白表达量及活性,分别升高6.05倍、4.12倍和1.58倍(P＜0.01)；与此同时MMP 9高表达组大鼠皮肤成纤维细胞S期的比例、增殖指数、细胞活力、胶原(羟脯氨酸)分泌量、6h横向迁移率和纵向迁移细胞数,分别下降29.8％、18.1％、23.3％、68.7％、45.0％和21.4％ (P ＜0.01).结论 MMP 9高表达的皮肤成纤维细胞增殖减慢、活力下降、迁移和胶原分泌能力降低,提示MMP 9可能抑制成纤维细胞的生物学行为.

abstractsObjective To study the effects of high matrix metalloproteinase 9 (MMP 9 ) on the biological behaviors of fibroblasts,in order to clarify the possible mechanisms in the wound healing of diabetic foot.Methods Establish the cell model of skin fibroblast with high expression of MMP 9 by high glucose (22.0 mmol/L) and high homocysteine (100 μmol/L) co-culture.Control group was incubated with normal glucose (5.5 mmol/L).Realtime PCR,ELISA and gelatin zymography were used to detect the MMP 9 mRNA,protein expression and activity of MMP 9.Flow cytometry,CCK-8,ELISA assay,scratch test and transwell were used to detect cell proliferation,viability,collagen (hydroxyproline) secretion,horizontal migration and vertical migration of cells.Results Data were expressed as (x- ± s).Differences were considered significant if their P value was ＜ 0.05.Results The expression of MMP 9 mRNA,protein levels and the activity of MMP 9 in high MMP 9 group were 6.05 folds,4.12 folds and 1.58 folds higher than those in control group (P ＜ 0.01,respectively).The proportion of S phase cells,proliferation index,cell viability,collagen (hydroxyproline) secretion,6 h horizontal migration rate and the number of vertical migration cells in high MMP9 group decreased by 29.8 ％,18.1％,23.3 ％,68.7 ％,45.0 ％ and 21.4 ％ than those in control group (P ＜ 0.01,respectively ). Conclusions Fibroblast with high expression of MMP 9 have decreased proliferation,activity,collagen secretion and reduced migration,which suggests that MMP 9 may inhibit the biological behaviors of fibroblasts.