RNA干扰技术阻抑热休克蛋白对瘢痕疙瘩生成的影响

目的 利用RNA干扰(RNAi)技术,通过热休克蛋白47重组质粒(HSP47 siRNA)和脂质体的混合液,对瘢痕疙瘩裸鼠动物模型的体内干预后,分析HSP47基因在瘢痕疙瘩生成中的作用.方法 构建裸鼠瘢痕疙瘩动物模型,于第16天腹腔麻醉后在实验组瘢痕疙瘩内注射质粒、脂质体混合液0.25 ml,对照组裸鼠腹腔注射磷酸缓冲液(PBS)0.25 ml,原笼饲养,7 d回收标本,分别做mRNA水平检测,胶原蛋白水平检测以及免疫组织化学检测.结果 实验组 HSP47 mRNA表达明显降低,且实验组总胶原含量,Ⅰ型胶原蛋白 mRNA表达与对照组比较也明显降低,差异均有统计学意义(P＜0.05).结论 利用RNAi技术,通过过HSP47 siRNA表达载体特异性沉默瘢痕疙瘩中HSP47基因表达后,瘢痕疙瘩中胶原蛋白的合成和分泌均能得到明显抑制,表明HSP47基因具有促进瘢痕疙瘩生成作用,为抑制瘢痕疙瘩提供新的靶点.

Effects of RNAi on keloid formation by inhibiting heat shock protein

Objective To study the significance of HSP47 gene in keloid formation after in vivo study with RNAi technology and the recombinant HSP4 7 siRNA against heat shock protein 47 to keloid in a nude mice model.Methods We injected RNAi mixture into the keloid of a nude mice model in experimental group and PBS water(0.25 ml)into control group at the 16th days after establishing the models.After interference we observed the specimens and harvested specimens at 7th days for biochemical and pathological analysis.Results The expression of HSP47 mRNA reduced obviously and the collagen content also reduced in the experimental group.The rusults had statistical significance.Conclusion We can suppress the expression of HSP47 gene and then reduce the production of collagen after in vivo interfering experiment with HSP4 7 siRNA in keloid nude mice models using RNAi technique.This study cornfirms the mechanism that HSP47 promotes the keloid formation,which provides a new target to treat keloid.