Conserved dopamine neurotrophic factor protects and rescues dopaminergic neurodegeneration induced by 6-hydroxydopamine in vivo,but its potential value in treating Parkinson＇s disease remains controversial.Here,we us...Conserved dopamine neurotrophic factor protects and rescues dopaminergic neurodegeneration induced by 6-hydroxydopamine in vivo,but its potential value in treating Parkinson＇s disease remains controversial.Here,we used the proteasome inhibitors lactacystin and MG132 to induce neurodegeneration of PC12 cells.Afterwards,conserved dopamine neurotrophic factor was administrated as a therapeutic factor,both pretreatment and posttreatment.Our results showed that（1）conserved dopamine neurotrophic factor enhanced lactacystin/MG132-induced cell viability and morphology,and attenuated alpha-synuclein accumulation in differentiated PC12 cells.（2）Enzyme linked immunosorbent assay showed up-regulated 26S proteasomal activity in MG132-induced PC12 cells after pre-and posttreatment with conserved dopamine neurotrophic factor.Similarly,26S proteasome activity was upregulated in lactacystin-induced PC12 cells pretreated with conserved dopamine neurotrophic factor.（3）With regard proteolytic enzymes（specifically,glutamyl peptide hydrolase,chymotrypsin,and trypsin）,glutamyl peptide hydrolase activity was up-regulated in lactacystin/MG132-administered PC12 cells after pre-and posttreatment with conserved dopamine neurotrophic factor.However,upregulation of chymotrypsin activity was only observed in MG132-administered PC12 cells pretreated with conserved dopamine neurotrophic factor.There was no change in trypsin expression.We conclude that conserved dopamine neurotrophic factor develops its neurotrophic effects by modulating proteasomal activities,and thereby protects and rescues PC12 cells against neurodegeneration.展开更多
基金supported by the Natural Science Foundation of Anhui Province of China,No.11040606Q11the National Natural Science Foundation of China,No.81100960
文摘Conserved dopamine neurotrophic factor protects and rescues dopaminergic neurodegeneration induced by 6-hydroxydopamine in vivo,but its potential value in treating Parkinson＇s disease remains controversial.Here,we used the proteasome inhibitors lactacystin and MG132 to induce neurodegeneration of PC12 cells.Afterwards,conserved dopamine neurotrophic factor was administrated as a therapeutic factor,both pretreatment and posttreatment.Our results showed that（1）conserved dopamine neurotrophic factor enhanced lactacystin/MG132-induced cell viability and morphology,and attenuated alpha-synuclein accumulation in differentiated PC12 cells.（2）Enzyme linked immunosorbent assay showed up-regulated 26S proteasomal activity in MG132-induced PC12 cells after pre-and posttreatment with conserved dopamine neurotrophic factor.Similarly,26S proteasome activity was upregulated in lactacystin-induced PC12 cells pretreated with conserved dopamine neurotrophic factor.（3）With regard proteolytic enzymes（specifically,glutamyl peptide hydrolase,chymotrypsin,and trypsin）,glutamyl peptide hydrolase activity was up-regulated in lactacystin/MG132-administered PC12 cells after pre-and posttreatment with conserved dopamine neurotrophic factor.However,upregulation of chymotrypsin activity was only observed in MG132-administered PC12 cells pretreated with conserved dopamine neurotrophic factor.There was no change in trypsin expression.We conclude that conserved dopamine neurotrophic factor develops its neurotrophic effects by modulating proteasomal activities,and thereby protects and rescues PC12 cells against neurodegeneration.
文摘目的:探讨人参皂苷Rg1(ginsenoside Rg1,Rg1)对lactacystin所致SH-SY5Y细胞损伤的保护作用及可能机制。方法:实验分正常对照组、lactacystin组、lactacystin和Rg1联合处理组(0.1,1,10μmol/L),分别用CCK-8检测细胞活力,免疫荧光法、流式细胞术测定法检测二价金属离子转运蛋白1(divalent metal transporter 1,DMT1)表达情况,calcein-AM荧光检测细胞的摄铁能力,JC-1染色检测细胞线粒体膜电位,荧光探针carboxy-H2DCFDA检测胞内氧化应激水平。结果:与lactacystin组相比,lactacystin和Rg1联合处理组的细胞活力显著增加,细胞DMT1表达减少,细胞摄铁能力下降,线粒体膜电位增加,胞内氧化应激水平降低,差异均有统计学意义(P<0.05)。结论:Rgl对lactacystin诱导损伤的SHSY5Y细胞具有一定的神经保护作用,其作用机制可能与下调DMT1介导的细胞摄铁能力,稳定线粒体膜电位,降低氧化应激反应有关。
