Objective To observe the repair effect and mechanism of Danhuang Powder-containing serum on high glucose-induced vascular endothelial cell injury.Methods Danhuang Powder-containing serum was prepared.Human umbilical vein endothelial cells(HUVECs)were cultured to be divided into control group,recombinant human epidermal growth factor(called"growth factor"for short)group,Danhuang Powder group,high glucose group,high glucose+growth factor group,and high glucose+Danhuang Powder group.After corresponding intervention in each group for 48 hours,the cell ultrastructure and autophagy were observed under transmission electron microscope,apoptosis was detected by flow cytometry,and the protein expression levels of vascular endothelial growth factor(VEGF),epidermal growth factor(EGF)and basic fibroblast growth factor(bFGF)in the cells were detected by Western Blot.Results(1)The intra-mitochondrial ridges in the control group were clearly visible,autophagosomes and autolysosomes were fewer;mitochondria in the high glucose group were swollen and irregular,and appeared vacuolated;and the more typical autophagy-like structures were seen in the high glucose+Danhuang Powder group.(2)Compared with the high glucose group and high glucose+growth factor group,the apoptosis rate of cells in the high glucose+Danhuang Powder group was significantly decreased(P<0.05).(3)Compared with the high glucose group and the high glucose+growth factor group,the protein expression levels of VEGF,EGF and bFGF in the cells of the high glucose+Danhuang Powder group were significantly increased(P<0.05).Conclusion Danhuang Powder-containing serum can reduce the high glucose-induced damage in HUVEC cells,and its mechanism may be related to the activation of mitochondrial autophagy,and the inhibition of apoptosis,as well as the up-regulation of the expression of VEGF,EGF and bFGF.

Objective To investigate the effect of Danhuangsan on high glucose-induced vascular endothelial cell injury based on PINK 1/Parkin signaling pathway,and to explore its specific mechanism.Methods Human um-bilical vein endothelial cells were cultured in vitro and randomly divided into control group,growth factor group,Danhuangsan group,high glucose group,high glucose+growth factor group,high glucose+Danhuangsan group,with 3 cases in each group,treated for 48 hours.Cell scratch test was used to detect cell migration rate,and Transwell test was used to detect cell invasion rate.Immunofluorescence was used to detect the expression of anti-apoptotic protein Bcl-2,Beclin-1 and pro-apoptotic protein Bax.Western blot was used to detect the protein expression levels of PINK 1,Parkin and LC 3-Ⅱ.Results Cell scratch test and Transwell test showed that under normal environment and high glucose treatment,Danhuangsan could reduce the cell migration and invasion rate(P＜0.05).Immunofluorescence assay showed that under normal environment and high glucose treatment,Danhuang-san up-regulated the expression levels of Bcl-2 and Beclin-1 protein in cells(P＜0.05).Western blot results showed that under normal environment and high glucose treatment,Danhuangsan increased the protein expression levels of PINK 1,Parkin and LC 3-Ⅱ in cells and down-regulated the expression levels of Bax protein(P＜0.05),and the effects of Danhuang powder were significantly better than those of blank serum and growth factor(P＜0.05).Conclusion Danhuangsan can alleviate high glucose-induced endothelial cell injury by activating PINK 1/Parkin pathway,and the mechanism may be related to promoting mitophagy and enhancing the repair of damage.