中文摘要：

背景：已有文献报道,间充质干细胞可通过分泌大量生物活性因子有效减轻损伤的心脏、肺脏、肾脏等器官纤维化的发生。目的：观察骨髓间充质干细胞条件培养液对正常成纤维细胞和瘢痕成纤维细胞的影响及作用机制。方法：制备骨髓间充质干细胞条件培养液,将其作用于正常成纤维细胞和增生性瘢痕成纤维细胞,采用ELISA检测转化生长因子β的分泌水平,RT-PCR检测TGF-β/Smad信号通路相关基因Smad7的表达,比色法检测各组细胞上清液中羟脯氨酸的含量。结果与结论：①骨髓间充质干细胞条件培养液对增生性瘢痕成纤维细胞转化生长因子β的分泌、胶原的合成有显著抑制作用（P〈0.01）,并且明显增强Smad7基因的表达（P〈0.01）;②骨髓间充质干细胞条件培养液对正常成纤维细胞的影响较小;③结果表明,骨髓间充质干细胞条件培养液对增生性瘢痕成纤维细胞具有显著抑制作用,为干细胞防治皮肤瘢痕提供基础理论支持。

英文摘要：

BACKGROUND：Numerous studies have shown that mesenchymal stem cel s （MSCs） can effectively attenuate the fibrosis of damaged heart, lung and kidney by secreting various bioactive factors. OBJECTIVE：To evaluate the anti-fibrotic therapeutic potential of bone marrow MSCs conditioned media in vitro. METHODS：Normal fibroblasts and hypertrophic scar fibroblasts were treated with bone marrow MSCs conditioned media, then transforming growth factor-βand col agen production were analyzed by ELISA, and mRNA expression level of Smad7 and hydroxyproline content were detected by RT-PCR and colorimetry, respectively. RESULTS AND CONCLUSION：Bone marrow MSCs conditioned media significantly inhibited the production of both transforming growth factor-βand col agen in hypertrophic scar fibroblasts （P〈0. 01）, and up-regulated the mRNA expression level of Smad7 （P〈0. 01）, a major inhibitory regulator in the SMAD family. However, the normal fibroblasts were scarcely influenced by bone marrow MSCs conditioned media. These findings indicate that bone marrow MSCs conditioned media is considered a promising candidate for the treatment of hypertrophic scars, which may provide new theoretical supports to reduce cutaneous scarring.