基于PINK1/parkin通路介导线粒体自噬探讨冲和膏促进糖尿病溃疡创面愈合的机制  

Mechanism of Chonghe paste promoting wound healing of diabetic ulcer through PINK1/parkin pathway-mediated mitophagy

作　　者：党赢 焦雨琦 海日[1] 师建平[1] DANG Ying;JIAO Yuqi;HAI Ri;SHI Jianping(Inner Mongolia Medical University,Hohhot 010110,China)

机构地区：[1]内蒙古医科大学,内蒙古呼和浩特010110

出　　处：《中国病理生理杂志》2025年第2期338-347,共10页Chinese Journal of Pathophysiology

基　　金：国家自然科学基金资助项目(No.82460899);内蒙古自治区高等教育科学研究项目(No.NJZY23131);内蒙古自治区草原英才团队滚动支持项目(No.CYYCTD2024017)。

摘　　要：目的:探讨冲和膏调控PTEN诱导激酶1(PINK1)/parkin通路介导线粒体自噬对糖尿病溃疡创面愈合的作用机制。方法:采用高糖高脂饲料、腹腔注射链脲佐菌素和皮肤缺损法构建糖尿病溃疡模型大鼠36只,随机分为模型组、冲和膏组和生长因子组,每组12只。另取12只大鼠构建普通创面模型作为正常组。正常组和模型组采用生理盐水清创,冲和膏组和生长因子组分别用冲和膏和生长因子涂敷创面。观察记录大鼠空腹血糖变化和创面愈合情况,分别于治疗后第7和14天取材。采用免疫组化法检测创面肉芽组织中白细胞介素6(IL-6)、肿瘤坏死因子α(TNF-α)、P62和III型胶原(COL3)的表达水平。电镜观察线粒体微结构并记录自噬体数量变化。免疫荧光、Western blot和RT-qPCR检测各组大鼠创面组织PINK1、parkin和微管相关蛋白1轻链3-II(LC3-II)表达。结果:与正常组比较,模型组、冲和膏组和生长因子组大鼠血糖在第7、14和28天均高于16.67 mmol/L,提示糖尿病大鼠造模成功。与正常组比较,模型组创面愈合率较低,IL-6、TNF-α和P62平均吸光度升高,COL3平均吸光度降低,单位面积自噬体数量增加,PINK1、parkin和LC3-II平均吸光度降低,PINK1、parkin和LC3-II的mRNA和蛋白表达水平降低。与模型组比较,冲和膏组和生长因子组创面愈合率升高,IL-6、TNF-α和P62平均吸光度降低,COL3平均吸光度升高,单位面积自噬体数量减少,PINK1、parkin和LC3-II平均吸光度升高,PINK1、parkin和LC3-II的mRNA和蛋白表达水平升高。结论:冲和膏可减轻糖尿病溃疡创面局部炎症反应,降低炎症因子IL-6和TNF-α水平,促进COL3表达,激活PINK1/parkin信号通路,促进创面组织线粒体自噬,从而加快创面愈合。AIM:To explore the mechanism of Chonghe paste in regulating PTEN-induced kinase 1(PINK1)/parkin pathway-mediated mitophagy on diabetic ulcer wound healing.METHODS:Thirty-six rats were used to construct a diabetic ulcer model by high-sugar and high-fat feed,intraperitoneal injection of streptozotocin and skin defect method,and were randomly divided into model group,Chonghe paste group and growth factor group,with 12 rats in each group.Another 12 rats were taken to construct normal wound model as normal group.The rats in normal group and model group were treated with normal saline for debridement,while those in Chonghe paste group and growth factor group were treated with Chonghe paste and growth factors for wound coating,respectively.The changes in fasting blood glucose and wound healing were observed and recorded,and samples were collected on the 7th and 14th days after treatment.The expression levels of interleukin-6(IL-6),tumor necrosis factor-α(TNF-α),P62 and collagen type III(COL3)in granulation tissues were detected by immunohistochemistry.The mitochondrial ultrastructure was observed under an electron microscope,and the number of autophagosomes was recorded.The expression of PINK1,parkin and microtubule-associated protein 1 light chain 3-II(LC3-II)in wound tissues was detected by immunofluorescence,Western blot and RT-qPCR.RE-SULTS:Compared with normal group,the blood glucose levels of the rats in model group,Chonghe paste group and growth factor group were higher than 16.67 mmol/L on the 7th,14th and 28th days,indicating successful modeling of dia-betes.Compared with normal group,the rats in model group had a lower wound healing rate,the mean absorbance of IL-6,TNF-αand P62 was increased,the mean absorbance of COL3 was decreased,the number of autophagosomes per unit area was increased,the mean absorbance of PINK1,parkin and LC3-II was decreased,and the mRNA and protein expres-sion levels of PINK1,parkin and LC3-II were decreased.Compared with model group,the wound healing rate of the rats in Chonghe pas

关 键 词：冲和膏 糖尿病溃疡 创面愈合 线粒体自噬 PINK1/parkin信号通路 

分 类 号：R587.1[医药卫生—内分泌] R285.5[医药卫生—内科学] R363[医药卫生—临床医学]