转化生长因子-β1,2在不同发育阶段皮肤组织中的定位及表达量的变化

目的:探讨转化生长因子-β_{1, 2}(TGF-β₁和TGF-β₂)与α-平滑肌肌动蛋白(α-ASMA)在胎儿和成人皮肤中的分布和表达变化规律。方法:20例被测标本中包括不同胎龄的胎儿皮肤15例和成人皮肤5例。用免疫组化方法和病理技术确定这3种蛋白在不同发育阶段皮肤中的定位和表达量。结果:在妊娠早期的胎儿皮肤中, TGF-β_{1, 2}和α-ASMA呈弱阳性表达, 随着胎儿生长发育, 这3种蛋白的阳性细胞率逐渐增大;在妊娠晚期胎儿和成人皮肤中这3种蛋白的表达量明显多于妊娠早期胎儿皮肤(P＜0.01)。TGF-β_{1, 2}的阳性信号主要存在于表皮细胞, 内皮细胞和部分成纤维细胞中, α-ASMA蛋白定位于肌成纤维细胞和汗腺上皮细胞内。结论:TGF-β₁和TGF-β₂可能在皮肤的发生、结构和功能的维持以及皮肤损伤后的修复中起重要作用。

Localization and expression of TGF-

AIM:To explore the localization and expression of transforming growth factor-β_1,2 (TGF-β_1,2) and alpha-smooth muscle actin (α-ASMA) in fetal and adult skins. METHODS:Skins of 15 cases of fetuses with different gestational ages and 5 cases of adults were taken, embedded with paraffin wax, and sectioned. Immunohistochemistry method and pathological method were used to detect the expression intensity and distribution of TGF-β_1,2 and α-ASMA. RESULTS: Positive immunohistochemical signals of TGF-β_{1, 2} and α-ASMA were found in fetal and adult skins. In skins derived from young fetus, the positive signals of these three proteins were very weak. Along with the increment in gestational age, the positive cellular rates of TGF-β_1,2M and α-ASMA were elevated progressively. In elder fetal and adult skins, TGF-β_1,2 were mostly distributed in epidermal cells, endothelial cells and some fibroblasts, while α-ASMA was mainly located in myofibroblasts and sweat gland epithelial cells. CONCLUSION:The endogenous TGF-β_1,2might be involved in the cutaneous development at embryonic stage, in the cutaneous structure maintenance at adult stage, and in the wound healing after injury.