毛蕊花糖苷抑制Erastin诱导的多巴胺能神经细胞系MN9D细胞铁死亡

Verbascoside inhibits Erastin-induced ferroptosis of dopaminergic nerve cell line MN9D cells

背景:近年越来越多的研究证实多巴胺能神经元细胞铁死亡参与了帕金森病的发病,毛蕊花糖苷目前被证实具有抗氧化、抗炎和神经保护作用。目的:探讨毛蕊花糖苷对Erastin诱导的MN9D细胞铁死亡的保护效果及作用机制。方法:以MN9D细胞为研究对象,分为对照组、模型组(20μmol/L Erastin组)、Erastin+1μg/mL毛蕊花糖苷组、Erastin+5μg/mL毛蕊花糖苷组、Erastin+10μg/mL毛蕊花糖苷组。MN9D细胞在CO_(2)恒温培养箱中培养24 h,然后用不同质量浓度毛蕊花糖苷预处理8 h,再加入20μmol/L Erastin诱导24 h后,采用ELISA法检测还原型谷胱甘肽、超氧化物歧化酶、总铁离子、丙二醛水平,免疫组织化学法检测酪氨酸羟化酶的表达,Western blot法检测酪氨酸羟化酶、核因子红细胞-2相关因子2、血红素加氧酶1、谷胱甘肽过氧化物酶4蛋白表达。结果与结论:(1)与对照组相比,模型组还原型谷胱甘肽、超氧化物歧化酶水平明显减少(P<0.05),丙二醛和总铁离子水平明显增加(P<0.05);与模型组相比,毛蕊花糖苷1,5,10μg/mL组还原型谷胱甘肽、超氧化物歧化酶水平明显增加(P<0.05),丙二醛和总铁离子水平明减少(P<0.05);(2)与对照组相比,模型组酪氨酸羟化酶阳性细胞面积明显减少(P<0.05);与模型组相比,毛蕊花糖苷1,5,10μg/mL组酪氨酸羟化酶阳性细胞面积明显增加(P<0.05);(3)与对照组相比,模型组酪氨酸羟化酶、核因子红细胞-2相关因子2、血红素加氧酶1、谷胱甘肽过氧化物酶4的蛋白表达明显减少(P<0.05);与模型组相比,毛蕊花糖苷1,5,10μg/mL组酪氨酸羟化酶、核因子红细胞-2相关因子2、血红素加氧酶1、谷胱甘肽过氧化物酶4的蛋白表达明显增加(P<0.05)。结果提示:毛蕊花糖苷对Erastin诱导的MN9D细胞铁死亡具有明显的抑制作用,其机制可能通过作用于核因子红细胞-2相关因子2/血红素加氧酶1/谷胱甘肽过氧化物酶4通路实现的。

BACKGROUND:In recent years,more and more studies have confirmed that ferroptosis of dopaminergic neurons is involved in the pathogenesis of Parkinson's disease,and verbascoside has been confirmed to have antioxidant,anti-inflammatory and neuroprotective effects.OBJECTIVE:To investigate the protective effect of verbascoside on Erastin-induced ferroptosis of MN9D cells and its action mechanism.METHODS:MN9D cells were divided into control group,model group(20μmol/L Erastin group),Erastin+1μg/mL verbascoside group,Erastin+5μg/mL verbascoside group,and Erastin+10μg/mL verbascoside group.MN9D cells were cultured in a CO2 incubator for 24 hours,then pretreated with different mass concentrations of verbascoside for 8 hours,and induced with 20μmol/L Erastin for 24 hours.The levels of reduced glutathione,superoxide dismutase,total iron ion,and malondialdehyde were detected by ELISA.The expression of tyrosine hydroxylase was detected by immunohistochemistry.The expressions of tyrosine hydroxylase,nuclear factor erythrocyte-2-associated factor 2,heme oxygenase-1,and glutathione peroxidase 4 were detected by western blot assay.RESULTS AND CONCLUSION:(1)Compared with the control group,the levels of reduced glutathione and superoxide dismutase were significantly decreased(P<0.05),and the levels of malondialdehyde and total iron ion were significantly increased in the model group(P<0.05).Compared with the model group,the levels of reduced glutathione and superoxide dismutase were significantly increased(P<0.05),and the levels of malondialdehyde and total iron ionized water were decreased in 1,5,10μg/mL verbascoside groups(P<0.05).(2)Compared with the control group,the area of tyrosine hydroxylase positive cells in the model group was significantly reduced(P<0.05).Compared with the model group,the area of tyrosine hydroxylase positive cells was significantly increased in 1,5,10μg/mL verbascoside groups(P<0.05).(3)Compared with the control group,the protein expressions of tyrosine hydroxylase,nuclear factor erythrocyte-2-associated factor 2,heme oxygenase-1 and glutathione peroxidase 4 were significantly decreased in the model group(P<0.05).Compared with the model group,the protein expression levels of tyrosine hydroxylase,nuclear factor erythrocyte-2-associated factor 2,heme oxygenase-1,and glutathione peroxidase 4were significantly increased in 1,5,10μg/mL verbascoside groups(P<0.05).The results suggested that verbascoside could inhibit Erastin-induced ferroptosis in MN9D cells,possibly by activating nuclear factor erythrocyte-2-associated factor 2/heme oxygenase-1/glutathione peroxidase 4 pathway.