摘要
目的 :观察α -平滑肌肌动蛋白在瘢痕组织中的表达 ,了解病理性瘢痕形成过程中凋亡所扮演的角色及其与肌成纤维细胞在真皮中变化的关系。方法 :瘢痕标本来自烧伤后来我院进行整形手术的病人 ,同时取病人手术供皮区的正常皮肤作为对照。 8例瘢痕组织标本 (含 2例愈合较为平坦的瘢痕和 6例增生性瘢痕组织 )被分成增殖期和成熟期两组。运用caspase- 3mRNA及其蛋白的表达及TUNEL方法检测瘢痕及正常组织中的凋亡细胞 ,并以免疫组化法检测瘢痕及正常皮肤真皮内α-平滑肌肌动蛋白单克隆抗体的表达。结果 :瘢痕组织中细胞凋亡的数目与正常组织明显不同。瘢痕内的TUNEL标记阳性细胞数多于正常组织 ;增殖期瘢痕内的细胞凋亡的数目多于成熟期。增殖期TUNEL标记阳性的细胞多于平坦瘢痕 ,而成熟期两者无显著差别 ,Caspase - 3mRNA及其蛋白的表达与TUNEL标记结果具有一致性。随着瘢痕组织的成熟 ,α -平滑肌肌动蛋白单克隆抗体的表达逐渐降低 ,平坦的瘢痕组织中的表现尤为明显 ;增生性瘢痕中 ,增殖期与成熟期之间无显著差别。结论 :正常伤口愈合过程中 ,肌成纤维细胞暂时性的表达 ,可引起伤口的收缩 ,随着真皮再塑形 ,含有α -平滑肌肌动蛋白的肌成纤维细胞因凋亡而消失 ,而病理性的愈合结局可能是它持续表达的结果。
AIM: To examine the expression of alpha-smooth muscle actin in scar tissue, and observe the phenomenon of apoptosis and its involvement in the process of pathological scarring and the presence of myofibroblasts or absence of cell in the dermis. To investigate the potential role of reparative cell apoptosis in hyperplastic scar formation. METHODS: The samples of scar were obtained from post-burn patients undergoing plastic operation in our burn unit recently, and the samples of control came from skin donor site of the same patient correspondingly. TUNEL assays were performed to evaluate the number of apoptotic cells in scar versus normal skin. In situ hybridization and immunohistochemistry staining technique were employed to determine the expression of different dermis cells markers in scar tissue and normal skin. RESULTS: There existed evident difference in apoptotic cells in the dermis between scars tissue and normal human skin. The expression positive cells were much more in hyperplastic scars than that in normal human skin; the apoptotic cells of proliferative stage were slight more than that of mature stage. However, in proliferative stage, the number of apoptotic cells was higher for the combination of hyperplastic scar than normally healed flat scars. But in mature stage, no obviously difference was detected between hyperplastic scar and normally healed flat scar. The monoclonal anti-α smooth muscle actin (ASMA) expression was significantly stronger in proliferative stage than that of mature stage. CONCLUSIONS: With reconstitution of dermal tissue, myofibroblasts containing alpha-SM actin disappear under normal wound healing, probably as a result of apoptosis. The myofibroblast play a critical role in wound closure and in the pathologic sequelae of healing.
出处
《中国病理生理杂志》
CAS
CSCD
北大核心
2002年第11期1333-1336,I003,共5页
Chinese Journal of Pathophysiology
基金
国家重大基础研究规划基金资助项目 (G1 9990 542 0 4 )
国家自然科学基金资助项目 (No .39870 731 )
国家杰出青年科学基金资助项目 (No .3952 50 2 4 )
