铜绿假单胞菌感染大鼠皮肤创面愈合过程中TGF-β1及胶原蛋白含量的变化

目的 探讨大鼠慢性皮肤溃疡创面感染铜绿假单胞菌后,TGF-β1和胶原Ⅰ、Ⅲ蛋白表达的变化.方法 24只8周龄雌性Wister大鼠随机分为单纯创面组(A组)和创面+铜绿假单胞菌接种组(B组).分别在术后第1、3、7、10天观察创面上皮化率、收缩率及中性粒细胞情况;并采用ELISA方法测定创面第1、3、7、10天TGF-β1和胶原Ⅰ、Ⅲ蛋白的表达情况.结果 A组上皮化率在第7天高于B组,收缩率低于B组.随着时间的延长,A组中性粒细胞在第3天增加到最多,随后逐渐减少,而B组中性粒细胞第1天达到最多.2组TGF-β1表达在术后呈上升趋势,B组TGF-β1在第3天降低,随着时间延长回升,第7天2组比较差异有统计学意义(P＜0.05).胶原Ⅰ、Ⅲ蛋白表达随着时间的延长呈下降趋势,B组胶原Ⅲ蛋白表达在第7、10天差异有统计学意义(P＜0.05).A组第1、3天胶原Ⅰ、Ⅲ蛋白表达高于B组,在第7、10天则低于B组,且胶原Ⅲ蛋白在第3天显示A组高于B组,差异有统计学意义(P＜0.05).结论 皮肤溃疡创面感染铜绿假单胞菌后延迟了TGF-β1和胶原Ⅰ、Ⅲ蛋白的表达,可能影响创面的正常愈合.

Abstract：

Objective To explore the different expression of TGF-β1 and collagen during the healing process of wound infected by pseudomonas aeruginosa(PAO1).Methods 24 female Wister rats were randomly divided into pure wound group(group A)and wound+PAO1 group(group B).The reepithelial rate,shrinkage rate and neutrophils number on the wounds were observed on the 1st,3rd,7th and 10th day after operation.The expression of TGF-β1 and collage Ⅰ,Ⅲ was also detected.Results On the 7th day,the re-epithelial rate in group A was higher than that in group B,while the shrinkage rate in group A was lower than that in group B.The neutrophils number increased to peak on the 1 st day in group B,but on the 3rd day in group A.The TGF-β1 expression increased after operation in both groups,but it decreased in group B on the 3rd day and re-increased after that.The TGF-β1 expression was significantly different between the two groups on the 7th day(P＜0.05).The expression of collagen Ⅰ and Ⅲ decreased during healing.The expression of collagen Ⅲ in group A was higher on the 3rd day and was lower on the 7th and 10th day than that in group B,showing a significant difference(P＜0.05).Conclusions PAO1 infection could delay the expression of TGF-β1 and collagen Ⅰ,Ⅲon wound,which may interfere the healing process of wound.