Dental pulp stem cells(DPSCs) secrete neurotrophic factors which may play an important therapeutic role in neural development, maintenance and repair. To test this hypothesis, DPSCs-conditioned medium(DPSCs-CM) was co...Dental pulp stem cells(DPSCs) secrete neurotrophic factors which may play an important therapeutic role in neural development, maintenance and repair. To test this hypothesis, DPSCs-conditioned medium(DPSCs-CM) was collected from 72 hours serum-free DPSCs cultures. The impact of DPSCs-derived factors on PC12 survival, growth, migration and differentiation was investigated. PC12 cells were treated with nerve growth factor(NGF), DPSCs-CM or co-cultured with DPSCs using Transwell inserts for 8 days. The number of surviving cells with neurite outgrowths and the length of neurites were measured by image analysis. Immunocytochemical staining was used to evaluate the expression of neuronal markers NeuN, microtubule associated protein 2(MAP-2) and cytoskeletal marker βIII-tubulin. Gene expression levels of axonal growth-associated protein 43 and synaptic protein Synapsin-I, NeuN, MAP-2 and βIII-tubulin were analysed by quantitative polymerase chain reaction(qRT-PCR). DPSCs-CM was analysed for the neurotrophic factors(NGF, brain-derived neurotrophic factor [BDNF], neurotrophin-3, and glial cell-derived neurotrophic factor [GDNF]) by specific ELISAs. Specific neutralizing antibodies against the detected neurotrophic factors were used to study their exact role on PC12 neuronal survival and neurite outgrowth extension. DPSCs-CM significantly promoted cell survival and induced the neurite outgrowth confirmed by NeuN, MAP-2 and βIII-tubulin immunostaining. Furthermore, DPSCsCM was significantly more effective in stimulating PC12 neurite outgrowths than live DPSCs/PC12 co-cultures over the time studied. The morphology of induced PC12 cells in DPSCs-CM was similar to NGF positive controls;however, DPSCs-CM stimulation of cell survival was significantly higher than what was seen in NGF-treated cultures. The number of surviving PC12 cells treated with DPSCs-CM was markedly reduced by the addition of anti-GDNF, whilst PC12 neurite outgrowth was significantly attenuated by anti-NGF, anti-GDNF and anti-BDNF antibodies. These findi展开更多
Objective: To explore the underlying molecular mechanisms of cellular response to the challenge by 1-methyl-4-phenylpyridinium (MPP+)-induced apoptosis of PC12 cells, an in vitro cell model for Parkinson’s disease, a...Objective: To explore the underlying molecular mechanisms of cellular response to the challenge by 1-methyl-4-phenylpyridinium (MPP+)-induced apoptosis of PC12 cells, an in vitro cell model for Parkinson’s disease, and the effect of NF-κB activation on the protection of Parkinson’s disease by Isoflavone (I). Methods: PC12 cells were used to establish the cell model of Parkinson’s disease, and are divided into five groups: control group;MPP+ group;I (Isoflavone) + MPP+ group;I group;SN-50 + MPP+ group. The content of NF-κB in PC12 cells was determined by immunocytochemistry;The viability of PC12 cells after treated with cell-permeable NF-κB inhibitor SN-50 and cell viability were measured by MTT assay;the expression levels of NF-κB p65 in cytoplasm and nuclear fractions were evaluated by western blot analysis;the mRNA expression of NF-κB p65 was analyzed by in situ hybridization (ISH). Results: Compared with the control group, the protein of NF-κB p65 both in cytoplasm and in nuclei was significantly higher than in I + MPP+ and MPP+ groups;similarly, the mRNA expression level of NF-κB p65 gene was also significantly higher;moreover, the protein expression of NF-κB p65 was much lower in I group (P + group, the protein of NF-κB p65 was significantly lower in I + MPP+ group, the mRNA expression level of NF-κB p65 gene was also significantly lower, and the protein expression level of NF-κB p65 was much lower in I + MPP+ group (P + group (P > 0.05). Conclusion: NF-κB activation is essential to MPP+-induced apoptosis in PC12 cells;but Isoflavone can inhibit the cell damage to some extent to execute its protective function, which may be involved in nigral neurodegeneration in patients with Parkinson’s disease.展开更多
目的:研究Kinesin-3家族成员蛋白(Kinesin-3 family member1A,KIF1A)对氧糖剥夺-再灌注诱导的PC12细胞活力、自噬和凋亡的影响,为进一步研究KIF1A在脊髓缺血再灌注损伤治疗方面提供理论依据。方法:PC12细胞(美国ATCC公司)分为四组:A组,...目的:研究Kinesin-3家族成员蛋白(Kinesin-3 family member1A,KIF1A)对氧糖剥夺-再灌注诱导的PC12细胞活力、自噬和凋亡的影响,为进一步研究KIF1A在脊髓缺血再灌注损伤治疗方面提供理论依据。方法:PC12细胞(美国ATCC公司)分为四组:A组,对照组,无处理;B组,氧糖剥夺再灌注(oxygen glucose deprivation/reperfusion,OGD/R)组,PC12细胞用无糖DMEM培养基,于含混合气体(95%N2和5%CO2)的37℃恒温箱内密闭缺氧培养4h;C组,pcDNA3.1空质粒组,PC12细胞转染pcDNA3.1空质粒48h,进行OGD/R处理;D组,pcDNA3.1-KIF1A质粒组,PC12细胞转染pcDNA3.1-KIF1A质粒48h,进行OGD/R处理。B、C、D组经OGD/R处理后,更换常规培养基,正常孵育24h,收集细胞总RNA及蛋白质,进行实时定量PCR(quantitative real-time PCR,qRT PCR)和Western blot检测KIF1A mRNA和蛋白的表达情况;CCK8检测细胞存活率变化;凋亡ELISA及Caspase-3活性检测试剂盒检测细胞凋亡及Caspase-3活性;Western blot检测各组自噬相关基因LC3-Ⅰ、LC3-Ⅱ、P62以及哺乳动物雷帕霉素靶蛋白(mammalian target of rapamycin,mTOR)信号通路的蛋白表达变化。结果:与A组(1.00±0.00)相比,B组细胞KIF1A mRNA(0.41±0.05)和蛋白表达水平(0.52±0.07,P<0.05)显著下调;细胞活力[(51.60±7.35)%,P<0.05]显著降低。与B组(1.00±0.00)相比,C组空质粒对KIF1A mRNA(0.91±0.13)及蛋白质(1.08±0.08)表达,细胞活力[(51.60±7.35)%vs(47.30±4.16)%],细胞凋亡(1.95±0.18 vs 2.08±0.16,P>0.05)等无显著影响。而D组KIF1A过表达后能显著上调KIF1A mRNA(2.63±0.16)以及蛋白表达(2.51±0.18,P<0.05),显著缓解OGD/R引起的细胞存活率下降[(51.60±7.35)%vs(86.40±9.03)%]及凋亡[1.95±0.18 vs 1.36±0.12,P<0.05];与B组相比,D组自噬相关蛋白LC3-Ⅱ/LC3-Ⅰ的比值(1.68±0.14 vs 1.19±0.09,P<0.05)及pmTOR的表达(1.00±0.00 vs 1.26±0.02,P<0.05)显著受抑制,P62表达显著升高(0.53±0.05 vs 0.89±0.09,P<0.05)。结论:KIF1A过表达可促进缺血再灌注损伤诱导的PC12细胞存展开更多
The present study preliminarily evaluated neurotoxicity injuries induced by chlorpyrifos in PC12 cell,which were used as a model for nervous cell system.In cultured PC12 cell,application of soy isoflavones(genistein,d...The present study preliminarily evaluated neurotoxicity injuries induced by chlorpyrifos in PC12 cell,which were used as a model for nervous cell system.In cultured PC12 cell,application of soy isoflavones(genistein,daidzein,monomer and mixture)significantly reduced chlorpyrifos induced toxicity,a widely used pesticide,and resulted in a better cell survival rate.Treatments with isoflavones reduced malondialdehyde content,reactive oxygengeneration and acetylcholine level in medium,and maintained mitochondrial membrane potential integrity.Daidzein enhanced endogenous antioxidant system in PC12 cell with an increasing in superoxide dismutase perunit activity.Genistein reduced acetylcholine content in the medium.Daidzein and genistein showed different effects,and their combined effect were greater than individual.In conclusion,soy isoflavones as an antioxidant and neuroprotectant,enhanced choline metabolism,which effectively mitigated disadvantageous influence of PC12 cell caused by chlorpyrifos.展开更多
基金funded by Egyptian Cultural and Educational Bureau in London,Egyptian mission sector and ministry of higher education in Egypt(grant No.GAM2649)。
文摘Dental pulp stem cells(DPSCs) secrete neurotrophic factors which may play an important therapeutic role in neural development, maintenance and repair. To test this hypothesis, DPSCs-conditioned medium(DPSCs-CM) was collected from 72 hours serum-free DPSCs cultures. The impact of DPSCs-derived factors on PC12 survival, growth, migration and differentiation was investigated. PC12 cells were treated with nerve growth factor(NGF), DPSCs-CM or co-cultured with DPSCs using Transwell inserts for 8 days. The number of surviving cells with neurite outgrowths and the length of neurites were measured by image analysis. Immunocytochemical staining was used to evaluate the expression of neuronal markers NeuN, microtubule associated protein 2(MAP-2) and cytoskeletal marker βIII-tubulin. Gene expression levels of axonal growth-associated protein 43 and synaptic protein Synapsin-I, NeuN, MAP-2 and βIII-tubulin were analysed by quantitative polymerase chain reaction(qRT-PCR). DPSCs-CM was analysed for the neurotrophic factors(NGF, brain-derived neurotrophic factor [BDNF], neurotrophin-3, and glial cell-derived neurotrophic factor [GDNF]) by specific ELISAs. Specific neutralizing antibodies against the detected neurotrophic factors were used to study their exact role on PC12 neuronal survival and neurite outgrowth extension. DPSCs-CM significantly promoted cell survival and induced the neurite outgrowth confirmed by NeuN, MAP-2 and βIII-tubulin immunostaining. Furthermore, DPSCsCM was significantly more effective in stimulating PC12 neurite outgrowths than live DPSCs/PC12 co-cultures over the time studied. The morphology of induced PC12 cells in DPSCs-CM was similar to NGF positive controls;however, DPSCs-CM stimulation of cell survival was significantly higher than what was seen in NGF-treated cultures. The number of surviving PC12 cells treated with DPSCs-CM was markedly reduced by the addition of anti-GDNF, whilst PC12 neurite outgrowth was significantly attenuated by anti-NGF, anti-GDNF and anti-BDNF antibodies. These findi
文摘Objective: To explore the underlying molecular mechanisms of cellular response to the challenge by 1-methyl-4-phenylpyridinium (MPP+)-induced apoptosis of PC12 cells, an in vitro cell model for Parkinson’s disease, and the effect of NF-κB activation on the protection of Parkinson’s disease by Isoflavone (I). Methods: PC12 cells were used to establish the cell model of Parkinson’s disease, and are divided into five groups: control group;MPP+ group;I (Isoflavone) + MPP+ group;I group;SN-50 + MPP+ group. The content of NF-κB in PC12 cells was determined by immunocytochemistry;The viability of PC12 cells after treated with cell-permeable NF-κB inhibitor SN-50 and cell viability were measured by MTT assay;the expression levels of NF-κB p65 in cytoplasm and nuclear fractions were evaluated by western blot analysis;the mRNA expression of NF-κB p65 was analyzed by in situ hybridization (ISH). Results: Compared with the control group, the protein of NF-κB p65 both in cytoplasm and in nuclei was significantly higher than in I + MPP+ and MPP+ groups;similarly, the mRNA expression level of NF-κB p65 gene was also significantly higher;moreover, the protein expression of NF-κB p65 was much lower in I group (P + group, the protein of NF-κB p65 was significantly lower in I + MPP+ group, the mRNA expression level of NF-κB p65 gene was also significantly lower, and the protein expression level of NF-κB p65 was much lower in I + MPP+ group (P + group (P > 0.05). Conclusion: NF-κB activation is essential to MPP+-induced apoptosis in PC12 cells;but Isoflavone can inhibit the cell damage to some extent to execute its protective function, which may be involved in nigral neurodegeneration in patients with Parkinson’s disease.
文摘目的:研究紫铆花素对PC12细胞氧化应激损伤的保护作用及对线粒体功能的影响。方法:将大鼠PC12细胞分为正常对照组、模型组、溶剂对照组(1‰二甲基亚砜)和紫铆花素高、中、低浓度组(2、1、0.5μmol/L)。后4组给予相应试剂/药物干预24 h后,除正常对照组外的其余组均以100 m U/mL葡萄糖氧化酶诱导氧化应激模型。培养4 h后,检测细胞存活率、凋亡率和细胞内活性氧(ROS)、丙二醛(MDA)、超氧化物歧化酶(SOD)、过氧化氢酶(CAT)、谷胱甘肽过氧化物酶(GSH-Px)、三磷酸腺苷(ATP)、白细胞介素1β(IL-1β)、肿瘤坏死因子α(TNF-α)水平或活性以及线粒体膜电位(MMP)变化。结果:与正常对照组比较,模型组细胞存活率和SOD、CAT、GSH-Px、ATP活性或水平均显著降低,凋亡率、ROS含量和MDA、IL-1β、TNF-α水平均显著增加(P<0.05或P<0.01),MMP明显降低。与模型组比较,溶剂对照组上述指标均无明显变化(P>0.05),紫铆花素高、中、低浓度组细胞存活率和SOD(除中、低浓度组外)、CAT、GSH-Px(除中、低浓度组外)、ATP(除低浓度组外)活性或水平均显著升高,凋亡率、ROS含量和MDA、IL-1β、TNF-α水平均显著降低(P<0.05或P<0.01),MMP明显增加。结论:紫铆花素可通过增强抗氧化酶活性,稳定线粒体功能,抑制氧化应激和炎症反应,增加能量生成,进而抑制神经细胞凋亡,最终发挥神经保护的作用。
文摘目的:研究Kinesin-3家族成员蛋白(Kinesin-3 family member1A,KIF1A)对氧糖剥夺-再灌注诱导的PC12细胞活力、自噬和凋亡的影响,为进一步研究KIF1A在脊髓缺血再灌注损伤治疗方面提供理论依据。方法:PC12细胞(美国ATCC公司)分为四组:A组,对照组,无处理;B组,氧糖剥夺再灌注(oxygen glucose deprivation/reperfusion,OGD/R)组,PC12细胞用无糖DMEM培养基,于含混合气体(95%N2和5%CO2)的37℃恒温箱内密闭缺氧培养4h;C组,pcDNA3.1空质粒组,PC12细胞转染pcDNA3.1空质粒48h,进行OGD/R处理;D组,pcDNA3.1-KIF1A质粒组,PC12细胞转染pcDNA3.1-KIF1A质粒48h,进行OGD/R处理。B、C、D组经OGD/R处理后,更换常规培养基,正常孵育24h,收集细胞总RNA及蛋白质,进行实时定量PCR(quantitative real-time PCR,qRT PCR)和Western blot检测KIF1A mRNA和蛋白的表达情况;CCK8检测细胞存活率变化;凋亡ELISA及Caspase-3活性检测试剂盒检测细胞凋亡及Caspase-3活性;Western blot检测各组自噬相关基因LC3-Ⅰ、LC3-Ⅱ、P62以及哺乳动物雷帕霉素靶蛋白(mammalian target of rapamycin,mTOR)信号通路的蛋白表达变化。结果:与A组(1.00±0.00)相比,B组细胞KIF1A mRNA(0.41±0.05)和蛋白表达水平(0.52±0.07,P<0.05)显著下调;细胞活力[(51.60±7.35)%,P<0.05]显著降低。与B组(1.00±0.00)相比,C组空质粒对KIF1A mRNA(0.91±0.13)及蛋白质(1.08±0.08)表达,细胞活力[(51.60±7.35)%vs(47.30±4.16)%],细胞凋亡(1.95±0.18 vs 2.08±0.16,P>0.05)等无显著影响。而D组KIF1A过表达后能显著上调KIF1A mRNA(2.63±0.16)以及蛋白表达(2.51±0.18,P<0.05),显著缓解OGD/R引起的细胞存活率下降[(51.60±7.35)%vs(86.40±9.03)%]及凋亡[1.95±0.18 vs 1.36±0.12,P<0.05];与B组相比,D组自噬相关蛋白LC3-Ⅱ/LC3-Ⅰ的比值(1.68±0.14 vs 1.19±0.09,P<0.05)及pmTOR的表达(1.00±0.00 vs 1.26±0.02,P<0.05)显著受抑制,P62表达显著升高(0.53±0.05 vs 0.89±0.09,P<0.05)。结论:KIF1A过表达可促进缺血再灌注损伤诱导的PC12细胞存
基金supported by the National Key Technology R&D Program of the Ministry of Science and Technology(2012BAD33B03)China Agriculture Research System(CARS-04)+1 种基金the China Postdoctoral Science Foundation(2018M631876)Open Research Fund of National Research Center of Engineering and Technology of Tea Quality and Safety(2017NTQS0201)。
文摘The present study preliminarily evaluated neurotoxicity injuries induced by chlorpyrifos in PC12 cell,which were used as a model for nervous cell system.In cultured PC12 cell,application of soy isoflavones(genistein,daidzein,monomer and mixture)significantly reduced chlorpyrifos induced toxicity,a widely used pesticide,and resulted in a better cell survival rate.Treatments with isoflavones reduced malondialdehyde content,reactive oxygengeneration and acetylcholine level in medium,and maintained mitochondrial membrane potential integrity.Daidzein enhanced endogenous antioxidant system in PC12 cell with an increasing in superoxide dismutase perunit activity.Genistein reduced acetylcholine content in the medium.Daidzein and genistein showed different effects,and their combined effect were greater than individual.In conclusion,soy isoflavones as an antioxidant and neuroprotectant,enhanced choline metabolism,which effectively mitigated disadvantageous influence of PC12 cell caused by chlorpyrifos.