Expression characteristics of c-fos, c-myc and bFGF in early burn tissue

c-fos和c-myc原癌基因与bFGF在烧伤后早期创面组织中的表达规律(英文)

Objective To investigate the sequence and characteristics of expression of proto-oncogenes, c-fos, c-myc and endogenous basic fibroblast growth factor (bFGF), in burn tissue from rats. Methods A partial thickness burn of 30% TBSA was created on the backs of Wistar rats. Immunohistochemistry was used to detect the expression of these proteins in normal and burned skin at 3 hours, 6 hours, 1 day, 3 days, 7 days and 14 days postburn.Results Expression of c-fos, c-myc and bFGF was induced by the burn, but these three proteins showed different expression levels in sequence and distribution. Expression of c-fos increased and peaked at 3 hours postburn. Stain positive granules were distributed mainly in the cytoplasm of basal cells and the nuclei of fibroblasts. The expression of bFGF protein increased at 6 hours and peaked at 1 day postburn; it was distributed in the cytoplasm of fibroblasts. C-myc protein peaked at 3 days postburn and was also distributed in the cytoplasm of fibroblasts.Conclusions Thermal injury can induce c-fos, c-myc and bFGF expression and show phasic control and regional distribution. The phasic expression of these three proteins indicates that there maybe a regulatory relationship between proto-oncogenes and growth factors in early burn. This may play an important role in late tissue repair.

目的 探讨烧伤后创面组织原癌基因c fos、c myc和碱性成纤维细胞生长因子 (bFGF)的表达顺序及分布规律。方法 采用深Ⅱ 0烫伤模型 ,将 4 2只大鼠分为 7组 ,即正常对照组、烫伤后 3h、6h、1d、3d、7d和 14d组。用SP免疫组化方法研究烫伤后不同时间点内源性c fos、c myc和bFGF蛋白的表达规律及分布特征。结果 烧伤可以诱导c fos、c myc和bFGF表达 ,但三者的表达模式不尽相同。正常皮肤即有c fos表达 ,伤后 3h达峰值 ,以后逐渐下降 ,1d以后降至最低水平。其阳性颗粒主要分布于表皮基底细胞胞浆及真皮成纤维细胞的胞核内。c myc的表达在伤后 3d达最高值 ,阳性信号分布于真皮层的成纤维细胞的胞浆中 ;而bFGF则在伤后 6h开始出现 ,伤后第一天达最高值 ,主要分布于真皮层的成纤维细胞的胞浆中。结论 烧伤可以诱导皮肤创面组织原癌基因c fos、c myc及bFGF的表达 ,其表达具有时相与部位分布特征。三者表达的时相性提示在烧伤后早期原癌基因与生长因子基因之间具有相互调控作用 ,而这种调控作用对后期组织修复将产生一定的影响。