增生性瘢痕和瘢痕疙瘩组织中TGF—β1及Ⅰ,Ⅲ型胶原基因 …

目的 检测增生性瘢痕（Ｈ）和瘢痕疙瘩（Ｋ）组织中ＴＧＦ－β１及Ⅰ、Ⅲ型前胶原ｍＲＮＡ的表达，了解其相互关系及意义。方法 斑点杂交分析检测Ｈ和Ｋ组织中Ⅰ、Ⅲ前胶原及ＴＧＦ－β１ｍＲＢＡ稳态水平的改变；原位杂交检测ＴＧＦ－β１ｍＲＮＡ在组织中的空间分布。结果 ①Ｋ和Ｈ组织中ＴＧＦ－β１ｍＲＮＡ稳态水平明显高于Ｎ组和Ｓ组；②Ｋ选择性Ｉ型前胶原ｍＲＮＡ表达增强，而Ｈ组织中Ⅰ、Ⅲ前胶原ｍＲＮＡ表达均增强。

Changes in TGF-beta 1 and type I, III procollagen gene expression in keloid and hypertrophic scar]

OBJECTIVE: The expression of mRNA for TGF-beta 1, type I, III procollagen in keloid and hypertrophic scar was investigated in order to elucidate the pathogenesis of and the difference between keloid and hypertrophic scar. METHOD: Dot-blot hybridization analysis was used to examine the type I, III procollagen and the expression levels of steady-state mRNA. In situ hybridization allowed direct assessment of the distribution of TGF-beta 1 mRNA in the tissue. RESULTS: 1. Our study indicated that the expression level of mRNA for TGF-beta 1 significantly increased in keloid and hypertrophic scar compared with normal scar and normal skin. 2. In keloid tissues, type I precollagen mRNA expression was selectively increased. However, in hypertrophic scar, type I and III collagen mRNAs expressions were simultaneously increased. CONCLUSION: TGF-beta 1 plays an important role in the pathogenesis of keloid and hypertrophic scarring. It implicates that distinct molecular mechanisms are operative in the development of keloid and hypertrophic scarring.