积雪草苷对瘢痕成纤维细胞增殖与磷酸化Smad2和Smad7表达的影响

背景转化生长因子-β(TGF-β)是病理性瘢痕形成的重要因素.Smad蛋白家族是近年来发现的TGF-β受体下游信号蛋白.积雪草苷可抑制成纤维细胞增殖及胶原的合成,使瘢痕内的TGF-β表达减少.目的研究积雪草苷对瘢痕成纤维细胞增殖与磷酸化Smad2和Smad7的作用及机制.设计以细胞为研究对象,对照、观察性研究.单位一所大学医院烧伤整形科. 对象实验于2002-04/2003-03在中山大学外科实验室完成.标本取自因增生瘢痕住院进行整形手术的患者6例,男3例,女3例,年龄1～35岁.增生性瘢痕成纤维细胞由本科实验室经原代培养后传代获得.干预研究分为实验组和对照组,将积雪草苷作用于成纤维细胞为实验组,对照组不加积雪草苷,观察用药前后各指标的改变.主要观察指标①积雪草苷对磷酸化Smad2和Smad7的影响.②积雪草苷对细胞周期和凋亡的影响.结果积雪草苷可抑制瘢痕的成纤维细胞从S期进入M期,减少成纤维细胞中磷酸化Smad2的含量,两组差异无显著性意义(t=1.53,P=0.08),细胞中Smad7的含量实验组为(50.80±22.40)%,对照组(32 18±17.84)%,两组的差异有显著性意义(t=2.17,P=0.024).结论积雪草苷抑制瘢痕可通过Smad通路发挥作用.

Effect of asiaticoside on proliferation of scar fibroblasts and expression of phosphorylated Smad2 and Smad7

BACKGROUND: Transforming growth factor-β(TGF-β) is an essential factor for pathological scar formation. Smad protein group is the signal protein of lower reaches of TGF-β receptor. Asiaticoside can inhibit proliferation of fibroblasts and synthesis of collagen to reduce TGF-β expression in the scar.OBJECTIVE: To study the mechanism of asiaticoside on proliferation of scar fibroblasts and phosphorylated Smad2 and Smad7.DESIGN: Controlled study with observation, in which cell was taken as the object.SETTING: Department of burn and plastic surgery of a hospital affiliated to a university.PARTICIPANTS: The experiment was performed in Surgical Laboratory in Sun Yat-sen University from April 2002 to March 2003. The specimens were selected from 6 inpatients receiving plastic operation due to hyperplasic scar including 3 male and 3 female cases aged varied from 1 to 35 years. The hyperplasic scar fibroblasts were obtained generated from original culture in laboratory of surgical department.INTERVENTIONS: In the research, the experiment group and the control group were divided. In the experiment group, asiaticoside was applied on fibroblasts; in the control group, asiaticoside was not prescribed. The changes of every index were observed before and after medication.MAIN OUTCOME MEASURES: ① Effect of asiaticoside on expression of phosphorylated Smad2 and Smad7; ② Effect of asiaticoside on cell cycle and apoptosis.RESULTS: Asiaticoside inhibited scar fibroblasts entering M phrase from S phrase and reduced the content of phosphorylated Smad2 in fibroblasts, which did not present significant difference in two groups ( t = 1.53, P =0.08).The content of Smad7 in the cells was (50. 80 ± 22.40)% in the experiment group and (32.18 ± 17.84)% in the control group, which indicated significant difference ( t = 2. 17, P = 0. 024).CONCLUSION: Asiaticoside inhibits scar formation by Smad passage.