五味子甲素对MPP^+诱导的SH-SY5Y细胞凋亡的影响北大核心CSCD

目的初步研究不同浓度的五味子甲素(Schisandra A,Sch A)对1-甲基-4-苯基吡啶离子(1-methyl-4-phenylpyridinium ion,MPP^+)引起的SH-SY5Y细胞凋亡的影响。方法体外培养人神经母细胞瘤SH-SY5Y细胞,1 mmol/L MPP^+染毒同时分别给予1、3和5μmol/L Sch A处理48 h,Muse^(TM)细胞分析仪检测凋亡细胞数的变化;hoechst33342染色后激光共聚焦显微镜进一步观察各组细胞形态的改变;Western-blot检测各组细胞中cleaved caspase-3蛋白表达水平的变化。结果与对照组相比,1 mmol/L MPP^+染毒48 h可引起SH-SY5Y细胞凋亡细胞数明显增多;1、3和5μmol/L Sch A干预可明显抑制1mmol/L MPP^+诱导的SH-SY5Y细胞凋亡,且随着Sch A浓度的升高,凋亡细胞数明显减少。Western-blot实验结果显示,MPP^+组细胞中cleaved caspase-3蛋白表达水平明显升高,而Sch A干预组cleaved caspase-3蛋白表达明显降低(P<0.05)。结论 1 mmol/L MPP^+可诱导SH-SY5Y细胞凋亡,而一定浓度的Sch A能有效抑制MPP^+引起的SH-SY5Y细胞凋亡,且该作用可能是通过抑制caspase-3蛋白活化实现的。     

五味子乙素对两种神经瘤细胞的抑制作用

目的初步探讨不同浓度的五味子乙素(Sch B)对人神经母细胞瘤SH-SY5Y细胞及C6胶质瘤细胞生长及增殖的影响。方法体外培养人神经母细胞瘤SH-SY5Y细胞及C6胶质瘤细胞,分别以1~13μmol/L Sch B作用于SH-SY5Y细胞及C6细胞48 h。倒置显微镜下观察两种肿瘤细胞的形态学及数量变化,四唑盐比色法(MTT法)观察不同浓度的Sch B对细胞生长增殖的影响,酶标仪检测各组吸光度。结果与对照组相比,9~13μmol/L Sch B作用48 h均可引起SH-SY5Y细胞生长增殖抑制,1~7μmol/L Sch B对SH-SY5Y细胞没有毒性作用;而5μmol/L Sch B即可对C6胶质瘤细胞的生长增殖产生抑制作用。结论 Sch B对SH-SY5Y细胞及C6胶质瘤细胞的生长增殖均有明显的抑制作用,且C6胶质瘤细胞对Sch B的增殖抑制作用更为敏感。     

五味子甲素对MPP~+诱导的SH-SY5Y细胞凋亡的影响

目的初步研究不同浓度的五味子甲素(Schisandra A,Sch A)对1-甲基-4-苯基吡啶离子(1-methyl-4-phenylpyridinium ion,MPP~+)引起的SH-SY5Y细胞凋亡的影响。方法体外培养人神经母细胞瘤SH-SY5Y细胞,1 mmol/L MPP~+染毒同时分别给予1、3和5μmol/L Sch A处理48 h,Muse~(TM)细胞分析仪检测凋亡细胞数的变化;hoechst33342染色后激光共聚焦显微镜进一步观察各组细胞形态的改变;Western-blot检测各组细胞中cleaved caspase-3蛋白表达水平的变化。结果与对照组相比,1 mmol/L MPP~+染毒48 h可引起SH-SY5Y细胞凋亡细胞数明显增多;1、3和5μmol/L Sch A干预可明显抑制1mmol/L MPP~+诱导的SH-SY5Y细胞凋亡,且随着Sch A浓度的升高,凋亡细胞数明显减少。Western-blot实验结果显示,MPP~+组细胞中cleaved caspase-3蛋白表达水平明显升高,而Sch A干预组cleaved caspase-3蛋白表达明显降低(P0.05)。结论 1 mmol/L MPP~+可诱导SH-SY5Y细胞凋亡,而一定浓度的Sch A能有效抑制MPP~+引起的SH-SY5Y细胞凋亡,且该作用可能是通过抑制caspase-3蛋白活化实现的。     

IL-6调节MPP~+处理的SH-SY5Y细胞的ERK分泌

目的观察IL-6对1-甲基-4-苯基吡啶(MPP+)处理的SH-SY5Y细胞的生长和pERK的影响。方法对MPP+处理的SH-SY5Y细胞进行IL-6干预,观察细胞结构形态的改变以及pERK的含量变化和定位。结果 MPP+处理的SH-SY5Y细胞系细胞活力下降;细胞系pERK上升,高峰在24h,主要定位于胞浆;IL-6干预的SH-SY5Y细胞系pERK上升,高峰在6h,多定位于胞核。IL-6可以降低MPP+处理的SH-SY5Y细胞系的凋亡,使pERK分泌高峰提前;加用ERK抑制剂U0126可以下调IL-6对MPP+处理的SH-SY5Y细胞系的影响。结论IL-6可以通过调节pERK,减少MPP+诱导的细胞损伤,促进SH-SY5Y细胞的存活。     

6-羟基-1H-吲唑抑制Tau磷酸化对MPP~+诱导凋亡的SH-SY5Y细胞保护作用的研究

目的研究6-羟基-1H-吲唑通过抑制Tau磷酸化对MPP+诱导凋亡的SH-SY5Y细胞的保护作用。方法体外培养人神经母细胞瘤细胞SH-SY5Y,以MPP+诱导SH-SY5Y细胞凋亡作为帕金森病的细胞模型。MTT分析法检测提前2 h加入6-羟基-1H-吲唑对细胞的保护作用;Hoechst 33258荧光染色法检测神经元凋亡情况;免疫细胞化学方法检测多巴胺能神经元内Tau的磷酸化水平。结果 200μmol·L-1MPP+可以使SH-SY5Y细胞存活率下降至(47.80±0.84)%(P<0.01),并且升高Tau磷酸化水平,出现典型的凋亡。而6-羟基-1H-吲唑抑制MPP+对SH-SY5Y细胞的毒性,并通过抑制Tau蛋白过度磷酸化而减少神经元凋亡,使TH-阳性细胞数目增加。结论 6-羟基-1H-吲唑可以通过抑制Tau磷酸化而对MPP+诱导凋亡的SH-SY5Y细胞发挥保护作用,提示Tau蛋白可能可以作为药物治疗帕金森等神经退行性疾病的新靶点。     

鱼藤素对SH-SY5Y神经母细胞瘤细胞凋亡的诱导作用

目的研究鱼藤素对SH-SY5Y细胞凋亡的诱导作用。方法鱼藤素(0、0.625、1.25、2.5、5、10、20μmol·L~(-1))处理SH-SY5Y细胞24、48、72 h后,CCK-8法测定细胞存活率。鱼藤素(0、8、20、50μmol·L~(-1))处理SH-SY5Y细胞24 h,光镜下及AO/EB双染分别观察细胞形态和凋亡形态,流式细胞术检测细胞凋亡率,DCFH-DA荧光探针法检测细胞活性氧水平,分光光度法检测caspase-3活化程度。结果鱼藤素对SH-SY5Y细胞存活率呈时间和浓度依赖性抑制作用,作用24、48、72 h的IC50值分别为(26.07±2.18)、(18.33±0.94)、(12.5±1.49)μmol·L~(-1)。鱼藤素处理24 h后,细胞凋亡率、细胞活性氧水平明显上升(P<0.05),caspase-3活化程度升高,且三者均有浓度-效应特征。结论鱼藤素可抑制SH-SY5Y细胞存活,诱导细胞凋亡,其机制可能与升高活性氧水平和活化caspase-3相关。     

蜗牛多肽混合物抗过氧化氢诱导的SH-SY5Y细胞损伤的作用

目的观察蜗牛多肽混合物对过氧化氢(H2O2)诱导SH-SY5Y细胞氧化损伤的抑制作用及其可能机制。方法用H2O2诱导SH-SY5Y细胞损伤,MTT法测定细胞存活率;39～1250 mg·L-1蜗牛多肽混合物处理后,Hoechst染色检测细胞凋亡;罗丹明123染色检测线粒体通透性;细胞免疫化学技术和Western blot技术分别检测增殖细胞核抗原(PCNA)和脑源性神经营养因子(BDNF)的表达。结果 1.54 mmol·L-1H2O2可诱导SH-SY5Y细胞凋亡。用39～156 mg·L-1浓度的蜗牛多肽混合物处理后,H2O2诱导的SH-SY5Y细胞凋亡数量明显减少,同时可减少H2O2引起的线粒体通透性增加,升高PCNA与BDNF的表达(P﹤0.01)。结论蜗牛多肽混合物可抑制过氧化氢诱导的SH-SY5Y细胞凋亡,其作用机制可能与其增加细胞PCNA与BDNF的表达有关。     

左金方与反左金方抗MPP~+诱导SH-SY5Y细胞凋亡作用的对比研究

目的研究左金方和反左金方水提物对四氢吡啶离子(MPP+)诱导SH-SY5Y细胞凋亡的影响。方法体外培养SH-SY5Y细胞,建立MPP+致SH-SY5Y细胞凋亡的模型,同时给予左金方和反左金方水提物干预。应用MTT比色法检测细胞活力,流式细胞仪检测细胞凋亡率,Hochest染色观察凋亡细胞形态学的改变。结果0.5 mmol·L-1 MPP+作用于SH-SY5Y细胞60 h可诱导细胞凋亡,细胞存活率降低至(50.87±2.31)%,凋亡率增加至(43.38±1.49)%,Hochest 33258染色可见明显的颗粒状和固缩状荧光。左金方和反左金方水提物与0.5 mmol·L-1 MPP+同时处理SH-SY5Y细胞后,能够明显改变细胞的凋亡学特性,当药物浓度增加到2.0 mg·m L-1时,细胞存活率分别升高至(63.16±1.89)%和(75.19±1.97)%,与模型组比较,差异均有统计学意义(P<0.01);其凋亡率由模型组的(43.38±1.49)%分别降低到(20.17±1.43)%和(9.41±1.27)%(P<0.01),反左金方(热性)抗凋亡的作用更强。结论左金方(寒性)和反左金方(热性)均能对抗由MPP+诱导的SH-SY5Y细胞的凋亡,而反左金方(热性)抗凋亡作用更强,中药药性不同,其抗凋亡作用亦不同。     

氧化应激在鱼藤素致SH-SY5Y细胞神经毒性中的作用

目的研究氧化应激与鱼藤素致神经毒性的相关性,为后续鱼藤素的结构改造和联合用药提供机制基础。方法将鱼藤素(1.56~100μmol·L-1)与SH-SY5Y细胞共孵育培养24~72 h,采用CCK-8法测定细胞存活率;比色法测定乳酸脱氢酶(lactate dehydrogenase,LDH)漏出量、丙二醛(malondialdehyde,MDA)含量、谷胱甘肽过氧化物酶(glutathione peroxidase,GPx)和超氧化物歧化酶(superoxide dismutase,SOD)的活力;流式细胞术检测活性氧(reactive oxygen species,ROS)含量;免疫印迹法检测细胞中MEK、EGF、RAS、CREB蛋白的表达情况。结果鱼藤素对SH-SY5Y细胞增殖有抑制作用,且呈浓度和时间依赖性(P<0.05)。鱼藤素损伤细胞后,LDH漏出量、MDA和ROS含量明显增加,GPx和SOD的活力下降(P<0.05)。同时MAPK/ERK信号通路中MEK、EGF、RAS、CREB蛋白水平出现不同程度的下调。结论鱼藤素致SH-SY5Y神经细胞的损伤与氧化应激密切相关,MAPK/ERK信号通路可能在其中起介导作用。     

Apoptosis induced by acrylamide in SH-SY5Y cells

Acrylamide (1–5 mM) dose-dependently decreased cell viability in human neuroblastoma cells (SH-SY5Y). The caspase-3 activity and cell population in sub-G₁ phase were elevated and peaked on exposure to 3 mM acrylamide, while both were less so at higher dose (4 and 5 mM). Z-VAD-fmk, a pan-caspase inhibitor, lowered the apparent cytotoxicity of acrylamide. U0126, a specific inhibitor of extracellular signal-regulated protein kinase (ERK) kinase, suppressed the elevation of caspase-3 activities as well as that of sub-G₁ population. Thus, although mechanisms other than caspase-dependent apoptosis may be involved, apoptotic process seems to take place in the genesis of toxicity of acrylamide in SH-SY5Y cells through ERK pathway and activation of caspase-3.     

葛根素对MPP~+诱导的SH-SY5Y细胞凋亡过程中p53和mir-34a表达的影响

<正>近年来,部分以p53为靶点的化合物研究推动着蛋白相互作用和蛋白突变体构象领域药物的新发现[1],但有关中药单体分子对神经细胞退行性变过程中p53及其相关基因变化的研究尚不多见。本研究在前期相关实验基础上[2-4],采用MPP+诱导的SH-SY5Y细胞凋亡模型,进一步探讨葛根素是否通过调节p53及mir-34a表达来影响多巴胺神经细胞凋亡。1材料与方法     

Liriodendrin对多巴胺所致SH—SY5Y细胞损伤的保护作用

目的用多巴胺诱导的SH—SY5Y细胞凋亡模型，研究从小蜡树皮提取的单体化合物liriodendrin的神经保护作用。方法应用MTT法检测liriodendrin对细胞存活率的影响。应用Annexin V-FITC与PI双染流式法检测firiodendrin对多巴胺诱导的细胞凋亡的影响。应用荧光染料DCFH—DA及Rhodamine123对细胞内活性氧簇（ROS）及线粒体膜电位（Δψm）进行了检测。此外，应用RT—PCR方法，对细胞内P53基因的转录水平进行了检测。结果在经过10^-8，10^-7，10^-6，10^-5及10^-4mol·L^-1浓度liriodendrin处理后，细胞存活率与多巴胺处理组相比有显著性提高。流式细胞术结果显示liriodendrin具有显著的抗细胞凋亡作用。同时liriodendrin可明显改善多巴胺引起的 Δψm下降，并可以逆转多巴胺诱导的ROS水平升高。此外，liriodendrin还可以降低多巴胺引起的P53基因转录水平的升高。结论Liriodendrin对多巴胺诱导的细胞损伤有明显保护作用。推测主要机制可能与其调节细胞氧化应激反应及细胞凋亡的信号转导通路有关，提示该化合物可以作为治疗退行性神经疾病如帕金森氏病等的候选化合物。     

Tetrahydroxystilbene glucoside protects human neuroblastoma SH-SY5Y cells against MPP+-induced cytotoxicity

1-methyl-4-phenylpyridinium (MPP+), an inhibitor of mitochondrial complex I, has been widely used as a neurotoxin for inducing a cell model of Parkinson's disease. This study aimed to evaluate the effects of 2,3,5,4'-tetrahydroxystilbene-2-O-β-D-glucoside (TSG), an active component extracted from Polygonum multiflorum, on MPP+-induced cytotoxicity in human dopaminergic neuroblastoma SH-SY5Y cells. The results from the MTT and lactate dehydrogenase (LDH) assays showed that incubating cells with 500 μM MPP+ for 24 h decreased cell viability and increased LDH leakage, whereas preincubating cells with 3.125 to 50 μM TSG for 24 h protected the cells against MPP+-induced cell damage. Using 2',7'-dichlorofluorescin diacetate (DCFH-DA) and rhodamine 123, respectively, we found that TSG inhibited both the elevation of intracellular reactive oxygen species and the disruption of mitochondrial membrane potential induced by MPP+. In addition, TSG suppressed both the upregulation of the ratio of Bax to Bcl-2 and the activation of caspase-3 induced by MPP+, and TSG inhibited apoptosis as detected by flow cytometric analysis using Annexin-V and propidium (PI) label. These results suggest that TSG may protect neurons against MPP+-induced cell death through improving mitochondrial function, decreasing oxidative stress and inhibiting apoptosis, and this may provide a potentially new strategy for preventing and treating neurodegenerative disorders such as Parkinson's disease.     

6,7-di-O-glucopyranosyl-esculetin protects SH-SY5Y cells from dopamine-induced cytotoxicity

Dopamine, as a neurotoxin, can elicit severe Parkinson's disease-like syndrome by elevating intracellular reactive oxygen species levels and apoptotic activity. In this study, we examined the effect of 6,7-di-O-glucopyranosyl-esculetin, which was extracted from Fraxinus sieboldiana bloom, on dopamine-induced cytotoxicity and the underlying mechanism in human neuroblastoma SH-SY5Y cells. Our results suggest that the protective effects of 6,7-di-O-glucopyranosyl-esculetin (0.1, 1 and 10 μM) on dopamine-induced cytotoxicity may be ascribed to its anti-oxidative properties by reducing reactive oxygen species levels, and its anti-apoptotic effect via protecting mitochondrion membrane potential (ΔΨm), enhancing superoxide dismutaese (SOD) activity and reduced glutathione (GSH) levels, and regulating p53, Bax and Bcl-2 expression. In addition, 6,7-di-O-glucopyranosyl-esculetin inhibited the release of cytochrome c and apoptosis-inducing factor (AIF), and the protein expression of activated caspase 3. These data indicate that 6,7-di-O-glucopyranosyl-esculetin may provide a useful therapeutic strategy for the treatment of progressive neurodegenerative diseases such as Parkinson's disease.     

Adiponectin protects human neuroblastoma SH-SY5Y cells against acetaldehyde-induced cytotoxicity

Acetaldehyde, an inhibitor of mitochondrial function, has been widely used as a neurotoxin because it elicits a severe Parkinson's disease-like syndrome with elevation of the intracellular reactive oxygen species (ROS) level and apoptosis. Adiponectin, secreted from adipose tissue, mediates systemic insulin sensitivity with liver and muscle as target organs. In this study, we investigated the protective effects of adiponectin on acetaldehyde-induced apoptosis in human neuroblastoma SH-SY5Y cells and attempted to examine its mechanism. Acetaldehyde-induced apoptosis was moderately reversed by adiponectin treatment. Our results suggest that the protective effects of adiponectin on acetaldehyde-induced apoptosis may be ascribed to ability to induce the expression of anti-oxidant enzymes and to regulate Bcl-2 and Bax expression. These data indicate that adiponectin may provide a useful therapeutic strategy for the prevention of progressive neurodegenerative disease such as Parkinson's disease.     

毛蕊花苷对MPP~+诱导的SHSY5Y细胞凋亡的保护作用

目的观察肉苁蓉提取物毛蕊花苷对MPP+诱导的SHSY5Y细胞损伤的影响。方法用MTT法检测细胞存活率,以流式细胞仪检测细胞内活性氧的产生和线粒体膜电位的变化,以及细胞凋亡的发生,并用荧光酶标仪测定caspase-3的活性,蛋白印迹测定Bcl-2的表达水平。结果200μmol·L-1MPP+处理细胞24h降低细胞的存活率;诱导细胞发生凋亡,凋亡率达38.9%;细胞内活性氧水平及caspase-3的活性升高;而线粒体膜电位却明显降低。而预先给予0.1、1或者10mg·L-1浓度的毛蕊花苷处理细胞12h,可提高细胞存活率;流式细胞仪检测凋亡率分别降低到29.5%,15.3%和8.6%,而且细胞内活性氧的水平明显降低,并可逐渐恢复线粒体的高能量状态;caspase-3的活性不断降低,Bcl-2的表达水平增高,并呈现一定的剂量依赖性。结论毛蕊花苷能抑制MPP+诱导的SHSY5Y细胞凋亡,其神经细胞保护作用可能与其降低细胞内活性氧水平,维持线粒体膜电位的高能状态和抑制caspase-3的活性有关。     

Dimethyl sulfide,a metabolite of the marine microorganism,protects SH-SY5Y cells against 6-hydroxydopamine and MPP~+-induced apoptosis

Dimethyl sulfide(DMS)has been historically recognized as a metabolite of the marine microorganism or a disgusting component for the smell of halitosis patients.In our recent study,DMS has been identified as a cytoprotectant that protects against oxidative-stress induced cell death and aging.We found that at near-physiological concentrations,DMS reduced reactive oxygen species(ROS)in cultured PC12 cells and alleviated oxidative stress.The radical-scavenging capacity of DMS at near-physiological concentration was equivalent to endogenous methionine(Met)-centered antioxidant defense.Methionine sulfoxidereductase A(MsrA),the key antioxidant enzyme in Met-centered defense,bound to DMS and promoted its antioxidant capacity via facilitating the reaction of DMS with ROS through a sulfonium intermediate at residues Cys72,Tyr103,Glu115,followed by the release of dimethyl sulfoxide(DMSO).MTT assay and trypan blue test indicated that supplement of DMS exhibited cytoprotection against 6-hydroxydopamine and MPP+induced cell apoptosis.Furthermore,Msr A knockdown abolished the cytoprotective effect of DMS at near-physiological concentrations.The present study reveals new insight into the potential therapeutic value of DMS in Parkinson disease.