The Protective Role of E-64d in Hippocampal Excitotoxic Neuronal Injury Induced by Glutamate in HT22 Hippocampal Neuronal Cells

Epilepsy is the most common childhood neurologic disorder. Status epilepticus (SE), which refers to continuous epileptic seizures, occurs more frequently in children than in adults, and approximately 40–50% of all cases occur in children under 2 years of age. Conventional antiepileptic drugs currently used in clinical practice have a number of adverse side effects. Drug-resistant epilepsy (DRE) can progressively develop in children with persistent SE, necessitating the development of novel therapeutic drugs. During SE, the persistent activation of neurons leads to decreased glutamate clearance with corresponding glutamate accumulation in the synaptic extracellular space, increasing the chance of neuronal excitotoxicity. Our previous study demonstrated that after developmental seizures in rats, E-64d exerts a neuroprotective effect on the seizure-induced brain damage by modulating lipid metabolism enzymes, especially ApoE and ApoJ/clusterin. In this study, we investigated the impact and mechanisms of E-64d administration on neuronal excitotoxicity. To test our hypothesis that E-64d confers neuroprotective effects by regulating autophagy and mitochondrial pathway activity, we simulated neuronal excitotoxicity in vitro using an immortalized hippocampal neuron cell line (HT22). We found that E-64d improved cell viability while reducing oxidative stress and neuronal apoptosis. In addition, E-64d treatment regulated mitochondrial pathway activity and inhibited chaperone-mediated autophagy in HT22 cells. Our findings indicate that E-64d may alleviate glutamate-induced damage via regulation of mitochondrial fission and apoptosis, as well as inhibition of chaperone-mediated autophagy. Thus, E-64d may be a promising therapeutic treatment for hippocampal injury associated with SE.

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Neuroprotective Effects of Extracts from Tiger Milk Mushroom Lignosus rhinocerus Against Glutamate-Induced Toxicity in HT22 Hippocampal Neuronal Cells and Neurodegenerative Diseases in Caenorhabditis elegans

Biology ◽

10.3390/biology10010030 ◽

2021 ◽

Vol 10 (1) ◽

pp. 30

Author(s):

Parinee Kittimongkolsuk ◽

Nattaporn Pattarachotanant ◽

Siriporn Chuchawankul ◽

Michael Wink ◽

Tewin Tencomnao

Keyword(s):

Oxidative Stress ◽

Neuroprotective Effect ◽

Water Extract ◽

Neuroprotective Effects ◽

Ht22 Cells ◽

Antioxidant Genes ◽

C Elegans ◽

Intracellular Ros

Despite the Tiger Milk Mushroom Lignosus rhinocerus (LR) having been used as a traditional medicine, little is known about the neuroprotective effects of LR extracts. This study aims to investigate the neuroprotective effect of three extracts of LR against glutamate-induced oxidative stress in mouse hippocampal (HT22) cells as well as to determine their effect in Caenorhabditis elegans. In vitro, we assessed the toxicity of three LR extracts (ethanol extract (LRE), cold-water extract (LRC) and hot-water extract (LRH)) and their protective activity by MTT assay, Annexin V-FITC/propidium iodide staining, Mitochondrial Membrane Potential (MMP) and intracellular ROS accumulation. Furthermore, we determined the expression of antioxidant genes (catalase (CAT), superoxide dismutase (SOD1 and SOD2) and glutathione peroxidase (GPx)) by qRT-PCR. In vivo, we investigated the neuroprotective effect of LRE, not only against an Aβ-induced deficit in chemotaxis behavior (Alzheimer model) but also against PolyQ40 formation (model for Morbus Huntington) in transgenic C. elegans. Only LRE significantly reduced both apoptosis and intracellular ROS levels and significantly increased the expression of antioxidant genes after glutamate-induced oxidative stress in HT22 cells. In addition, LRE significantly improved the Chemotaxis Index (CI) in C. elegans and significantly decreased PolyQ40 aggregation. Altogether, the LRE exhibited neuroprotective properties both in vitro and in vivo.

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Cognitive Enhancing and Neuroprotective Effect of the Embryo of theNelumbo nuciferaSeed

Evidence-based Complementary and Alternative Medicine ◽

10.1155/2014/869831 ◽

2014 ◽

Vol 2014 ◽

pp. 1-9 ◽

Cited By ~ 7

Author(s):

Eun Sil Kim ◽

Jin Bae Weon ◽

Bo-Ra Yun ◽

Jiwoo Lee ◽

Min Rye Eom ◽

...

Keyword(s):

Memory Impairment ◽

Neuroprotective Effect ◽

Acetylcholinesterase Inhibition ◽

Neuroprotective Effects ◽

Ht22 Cells ◽

Treatment And Prevention ◽

Maze Test ◽

Ht22 Cell ◽

Underlying Mechanisms

The aim of the present study was to evaluate the effect of ENS on cognitive impairment induced by scopolamine and its potential neuroprotective effect against glutamate-induced cytotoxicity in HT22 cell and to investigate the underlying mechanisms. ENS (3, 10, 30, and 100 mg/kg), scopolamine (1 mg/kg), and donepezil (1 mg/kg) were administered to mice during a test period. Scopolamine impaired memory and learning in a water maze test and a passive avoidance test. The neuroprotective effect of ENS (10 and 100 μg/mL) was investigated on glutamate-induced cell death in HT22 cells by MTT assay. We investigated acetylcholinesterase inhibition in hippocampus and antioxidant activity, ROS levels, and Ca2+influx in HT22 cells to elucidate the potential mechanisms of ENS. We found that ENS significantly ameliorated scopolamine-induced memory impairment and inhibited AChE activity in hippocampus.In vitro, ENS showed potent neuroprotective effects against glutamate-induced neurotoxicity in the HT22 cell. In addition, ENS induced a decrease in ROS production and intercellular Ca2+accumulation and showed DPPH radical and H2O2scavenging activity. In conclusion, ENS showed both a memory improving effect and a neuroprotective effect. Our results indicate that ENS may be of use in the treatment and prevention of neurodegenerative disorders.

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Neuroprotective and anti-amnestic effects of a combination therapy in a model of photochemical ischemic damage in the prefrontal cortex

ZHurnal «Patologicheskaia fiziologiia i eksperimental`naia terapiia» ◽

10.25557/0031-2991.2018.02.39-45 ◽

2018 ◽

pp. 39-45

Author(s):

Ф.М. Шакова ◽

Т.И. Калинина ◽

М.В. Гуляев ◽

Г.А. Романова

Keyword(s):

Prefrontal Cortex ◽

Nerve Growth Factor ◽

Growth Factor ◽

Combination Therapy ◽

Neuroprotective Effect ◽

Regulatory Protein ◽

Human Growth ◽

Neuroprotective Effects ◽

Nerve Growth

Цель исследования - изучение влияния комбинированной терапии (мутантные молекулы эритропоэтина (EPO) и дипептидный миметик фактора роста нервов ГК-2H) на воспроизведение условного рефлекса пассивного избегания (УРПИ) и объем поражения коры мозга у крыс с двусторонним ишемическим повреждением префронтальной коры. Методика. Мутантные молекулы EPO (MЕРО-TR и MЕPО-Fc) с значительно редуцированной эритропоэтической и выраженной цитопротекторной активностью созданы методом генной инженерии. Используемый миметик фактора роста нервов человека, эндогенного регуляторного белка, в экспериментах in vitro проявлял отчетливые нейропротективные свойства. Двустороннюю фокальную ишемию префронтальной коры головного мозга крыс создавали методом фотохимического тромбоза. Выработку и оценку УРПИ проводили по стандартной методике. Объем повреждения мозга оценивался при помощи МРТ. MEPO-TR и MEPO-Fc (50 мкг/кг) вводили интраназально однократно через 1 ч после фототромбоза, ГК-2Н (1 мг/кг) - внутрибрюшинно через 4 ч после фототромбоза и далее в течение 4 послеоперационных суток. Результаты. Выявлено статистически значимое сохранение выработанного до ишемии УРПИ, а также значимое снижение объема повреждения коры при комплексной терапии. Полученные данные свидетельствуют об антиамнестическом и нейропротекторном эффектах примененной комбинированной терапии, которые наиболее отчетливо выражены в дозах: МEPO-Fc (50 мкг/кг) и ГК-2Н (1 мг/кг). Заключение. Подтвержден нейропротекторный эффект и усиление антиамнестического эффекта при сочетанном применении мутантных производных эритропоэтина - MEPO-TR и MEPO-Fc и дипептидного миметика фактора роста нервов человека ГК-2H. The aim of this study was to investigate the effect of combination therapy, including mutant erythropoietin molecules (EPO) and a dipeptide mimetic of the nerve growth factor, GK-2H, on the conditioned passive avoidance (PA) reflex and the volume of injury induced by bilateral ischemia of the prefrontal cortex in rats. Using the method of genetic engineering the mutant molecules of EPO, MERO-TR and MEPO-Fc, with strongly reduced erythropoietic and pronounced cytoprotective activity were created. The used human nerve growth factor mimetic, an endogenous regulatory protein based on the b-bend of loop 4, which is a dimeric substituted dipeptide of bis- (N-monosuccinyl-glycyl-lysine) hexamethylenediamine, GK-2 human (GK-2H), has proven neuroprotective in in vitro experiments. Methods. Bilateral focal ischemic infarction was modeled in the rat prefrontal cortex by photochemically induced thrombosis. The PA test was performed according to a standard method. Volume of brain injury was estimated using MRI. MEPO-TR, and MEPO-Fc (50 mg/kg, intranasally) were administered once, one hour after the injury. GK-2Н (1 mg/kg, i.p.) was injected four hours after the injury and then for next four days. Results. The study showed that the complex therapy provided statistically significant retention of the PA reflex developed prior to ischemia and a significant decrease in the volume of injury. The anti-amnestic and neuroprotective effects of combination therapy were most pronounced at doses of MEPO-Fc 50 mg/kg and GK-2H 1 mg/kg. Conclusion. This study has confirmed the neuroprotective effect and enhancement of the anti-amnestic effect exerted by the combination of mutant erythropoietin derivatives, MEPO-TR and MEPO-Fc, and the dipeptide mimetic of human growth factor GK-2H.

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Calycosin-7-O-β-D-glucoside Attenuates OGD/R-Induced Damage by Preventing Oxidative Stress and Neuronal Apoptosis via the SIRT1/FOXO1/PGC-1α Pathway in HT22 Cells

Neural Plasticity ◽

10.1155/2019/8798069 ◽

2019 ◽

Vol 2019 ◽

pp. 1-11

Author(s):

Xiangli Yan ◽

Aiming Yu ◽

Haozhen Zheng ◽

Shengxin Wang ◽

Yingying He ◽

...

Keyword(s):

Oxidative Stress ◽

Neuronal Apoptosis ◽

Ischemia Reperfusion ◽

Glucose Deprivation ◽

Pathological Process ◽

Neuroprotective Effects ◽

Ht22 Cells ◽

Positive Effects ◽

Antioxidant Stress

Neuronal apoptosis induced by oxidative stress is a major pathological process that occurs after cerebral ischemia-reperfusion. Calycosin-7-O-β-D-glucoside (CG) is a representative component of isoflavones in Radix Astragali (RA). Previous studies have shown that CG has potential neuroprotective effects. However, whether CG alleviates neuronal apoptosis through antioxidant stress after ischemia-reperfusion remains unknown. To investigate the positive effects of CG on oxidative stress and apoptosis of neurons, we simulated the ischemia-reperfusion process in vitro using an immortalized hippocampal neuron cell line (HT22) and oxygen-glucose deprivation/reperfusion (OGD/R) model. CG significantly improved cell viability and reduced oxidative stress and neuronal apoptosis. In addition, CG treatment upregulated the expression of SIRT1, FOXO1, PGC-1α, and Bcl-2 and downregulated the expression of Bax. In summary, our findings indicate that CG alleviates OGD/R-induced damage via the SIRT1/FOXO1/PGC-1α signaling pathway. Thus, CG maybe a promising therapeutic candidate for brain injury associated with ischemic stroke.

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Neurotherapeutic Effect of Inula britannica var. Chinensis against H2O2-Induced Oxidative Stress and Mitochondrial Dysfunction in Cortical Neurons

Antioxidants ◽

10.3390/antiox10030375 ◽

2021 ◽

Vol 10 (3) ◽

pp. 375

Author(s):

Jin Young Hong ◽

Hyunseong Kim ◽

Junseon Lee ◽

Wan-Jin Jeon ◽

Seung Ho Baek ◽

...

Keyword(s):

Oxidative Stress ◽

Mitochondrial Dysfunction ◽

Cortical Neurons ◽

Inflammatory Diseases ◽

Neuroprotective Effect ◽

Neuroprotective Effects ◽

Neuronal Viability ◽

Inula Britannica ◽

Oxidative Effects

Inula britannica var. chinensis (IBC) has been used as a traditional medicinal herb to treat inflammatory diseases. Although its anti-inflammatory and anti-oxidative effects have been reported, whether IBC exerts neuroprotective effects and the related mechanisms in cortical neurons remain unknown. In this study, we investigated the effects of different concentrations of IBC extract (5, 10, and 20 µg/mL) on cortical neurons using a hydrogen peroxide (H2O2)-induced injury model. Our results demonstrate that IBC can effectively enhance neuronal viability under in vitro-modeled reaction oxygen species (ROS)-generating conditions by inhibiting mitochondrial ROS production and increasing adenosine triphosphate level in H2O2-treated neurons. Additionally, we confirmed that neuronal death was attenuated by improving the mitochondrial membrane potential status and regulating the expression of cytochrome c, a protein related to cell death. Furthermore, IBC increased the expression of brain-derived neurotrophic factor and nerve growth factor. Furthermore, IBC inhibited the loss and induced the production of synaptophysin, a major synaptic vesicle protein. This study is the first to demonstrate that IBC exerts its neuroprotective effect by reducing mitochondria-associated oxidative stress and improving mitochondrial dysfunction.

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Neuroprotective Effects of the FGF21 Analogue LY2405319

Journal of Alzheimer s Disease ◽

10.3233/jad-200837 ◽

2021 ◽

pp. 1-13

Author(s):

Claire Rühlmann ◽

David Dannehl ◽

Marcus Brodtrück ◽

Andrew C. Adams ◽

Jan Stenzel ◽

...

Keyword(s):

Glial Cells ◽

Neuroprotective Effect ◽

Amyloid Β ◽

Fibroblast Growth Factor 21 ◽

Neuroprotective Effects ◽

Organotypic Brain Slice ◽

Brain Slice Cultures ◽

Abca1 Mrna

Background: To date, there are no effective treatments for Alzheimer’s disease (AD). Thus, a significant need for research of therapies remains. Objective: One promising pharmacological target is the hormone fibroblast growth factor 21 (FGF21), which is thought to be neuroprotective. A clinical candidate for medical use could be the FGF21 analogue LY2405319 (LY), which has a specificity and potency comparable to FGF21. Methods: The present study investigated the potential neuroprotective effect of LY via PPARγ/apoE/abca1 pathway which is known to degrade amyloid-β (Aβ) plaques by using primary glial cells and hippocampal organotypic brain slice cultures (OBSCs) from 30- and 50-week-old transgenic APPswe/PS1dE9 (tg) mice. By LY treatment of 52-week-old tg mice with advanced Aβ deposition, we further aimed to elaborate the effect of LY on AD pathology in vivo. Results: LY application to primary glial cells caused an upregulation of pparγ, apoE, and abca1 mRNA expression and significantly decreased number and area of Aβ plaques in OBSCs. LY treatment in tg mice increased cerebral [18F] FDG uptake and N-acetylaspartate/creatine ratio indicating enhanced neuronal activity and integrity. Although LY did not reduce the number of Aβ plaques in tg mice, the number of iba1-positive cells was significantly decreased indicating reduced microgliosis. Conclusion: These data identified LY in vitro as an activator of Aβ degrading genes leading to cerebral Aβ load amelioration in early and late AD pathology. Although Aβ plaque reduction by LY failed in vivo, LY may be used as therapeutic agent to treat AD-related neuroinflammation and impaired neuronal integrity.

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Humanin is an endogenous activator of chaperone-mediated autophagy

The Journal of Cell Biology ◽

10.1083/jcb.201606095 ◽

2017 ◽

Vol 217 (2) ◽

pp. 635-647 ◽

Cited By ~ 33

Author(s):

Zhenwei Gong ◽

Inmaculada Tasset ◽

Antonio Diaz ◽

Jaime Anguiano ◽

Emir Tas ◽

...

Keyword(s):

Quality Control ◽

Cell Death ◽

Heat Shock Protein 90 ◽

Protective Effects ◽

Neuroprotective Effects ◽

Selective Degradation ◽

Cytosolic Side ◽

Chaperone Mediated Autophagy

Chaperone-mediated autophagy (CMA) serves as quality control during stress conditions through selective degradation of cytosolic proteins in lysosomes. Humanin (HN) is a mitochondria-associated peptide that offers cytoprotective, cardioprotective, and neuroprotective effects in vivo and in vitro. In this study, we demonstrate that HN directly activates CMA by increasing substrate binding and translocation into lysosomes. The potent HN analogue HNG protects from stressor-induced cell death in fibroblasts, cardiomyoblasts, neuronal cells, and primary cardiomyocytes. The protective effects are lost in CMA-deficient cells, suggesting that they are mediated through the activation of CMA. We identified that a fraction of endogenous HN is present at the cytosolic side of the lysosomal membrane, where it interacts with heat shock protein 90 (HSP90) and stabilizes binding of this chaperone to CMA substrates as they bind to the membrane. Inhibition of HSP90 blocks the effect of HNG on substrate translocation and abolishes the cytoprotective effects. Our study provides a novel mechanism by which HN exerts its cardioprotective and neuroprotective effects.

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Network Pharmacology-Based Study of the Underlying Mechanisms of Huangqi Sijunzi Decoction for Alzheimer’s Disease

Evidence-based Complementary and Alternative Medicine ◽

10.1155/2021/6480381 ◽

2021 ◽

Vol 2021 ◽

pp. 1-13

Author(s):

Wei Zhang ◽

Mingti Lv ◽

Yating Shi ◽

Yonghui Mu ◽

Zhaoyang Yao ◽

...

Keyword(s):

Alzheimer’S Disease ◽

Alzheimer's Disease ◽

Neuroprotective Effect ◽

Signalling Pathway ◽

Signalling Pathways ◽

Network Pharmacology ◽

Neuroprotective Effects ◽

Target Network ◽

Compound Target

Background. Huangqi Sijunzi decoction (HQSJZD) is a commonly used conventional Chinese herbal medicine prescription for invigorating Qi, tonifying Yang, and removing dampness. Modern pharmacology and clinical applications of HQSJZD have shown that it has a certain curative effect on Alzheimer’s disease (AD). Methods. The active components and targets of HQSJZD were searched in the Traditional Chinese Medicine Systems Pharmacology Database and Analysis Platform (TCMSP). The genes corresponding to the targets were retrieved using UniProt and GeneCard database. The herb-compound-target network and protein-protein interaction (PPI) network were constructed by Cytoscape. The core targets of HQSJZD were analysed by Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG). The main active compounds of HQSJZD were docked with acetylcholinesterase (AChE). In vitro experiments were conducted to detect the inhibitory and neuroprotective effects of AChE. Results. Compound-target network mainly contained 132 compounds and 255 corresponding targets. The main compounds contained quercetin, kaempferol, formononetin, isorhamnetin, hederagenin, and calycosin. Key targets contained AChE, PTGS2, PPARG, IL-1B, GSK3B, etc. There were 1708 GO items in GO enrichment analysis and 310 signalling pathways in KEGG, mainly including the cAMP signalling pathway, the vascular endothelial growth factor (VEGF) signalling pathway, serotonergic synapses, the calcium signalling pathway, type II diabetes mellitus, arginine and proline metabolism, and the longevity regulating pathway. Molecular docking showed that hederagenin and formononetin were the top 2 compounds of HQSJZD, which had a high affinity with AChE. And formononetin has a good neuroprotective effect, which can improve the oxidative damage of nerve cells. Conclusion. HQSJZD was found to have the potential to treat AD by targeting multiple AD-related targets. Formononetin and hederagenin in HQSJZD may regulate multiple signalling pathways through AChE, which might play a therapeutic role in AD.

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Peptide TFP5/TP5 derived from Cdk5 activator P35 provides neuroprotection in the MPTP model of Parkinson’s disease

Molecular Biology of the Cell ◽

10.1091/mbc.e15-06-0415 ◽

2015 ◽

Vol 26 (24) ◽

pp. 4478-4491 ◽

Cited By ~ 19

Author(s):

BK. Binukumar ◽

Varsha Shukla ◽

Niranjana D. Amin ◽

Philip Grant ◽

M. Bhaskar ◽

...

Keyword(s):

Parkinson’S Disease ◽

Parkinson's Disease ◽

Neurodegenerative Disorder ◽

Neuroprotective Effect ◽

Selective Inhibition ◽

Motor Dysfunction ◽

Dopamine Neurons ◽

Dopamine Depletion ◽

Neuroprotective Effects

Parkinson’s disease (PD) is a chronic neurodegenerative disorder characterized by the loss of dopamine neurons in the substantia nigra, decreased striatal dopamine levels, and consequent extrapyramidal motor dysfunction. Recent evidence indicates that cyclin-dependent kinase 5 (Cdk5) is inappropriately activated in several neurodegenerative conditions, including PD. To date, strategies to specifically inhibit Cdk5 hyperactivity have not been successful without affecting normal Cdk5 activity. Previously we reported that TFP5 peptide has neuroprotective effects in animal models of Alzheimer’s disease. Here we show that TFP5/TP5 selective inhibition of Cdk5/p25 hyperactivation in vivo and in vitro rescues nigrostriatal dopaminergic neurodegeneration induced by 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP/MPP+) in a mouse model of PD. TP5 peptide treatment also blocked dopamine depletion in the striatum and improved gait dysfunction after MPTP administration. The neuroprotective effect of TFP5/TP5 peptide is also associated with marked reduction in neuroinflammation and apoptosis. Here we show selective inhibition of Cdk5/p25 hyperactivation by TFP5/TP5 peptide, which identifies the kinase as a potential therapeutic target to reduce neurodegeneration in Parkinson’s disease.

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In Vitro Evaluation of the Neuroprotective Effect of Panax notoginseng Saponins by Activating the EGFR/PI3K/AKT Pathway

Evidence-based Complementary and Alternative Medicine ◽

10.1155/2020/1403572 ◽

2020 ◽

Vol 2020 ◽

pp. 1-11

Author(s):

Shuang Wu ◽

Tiantian Yang ◽

Kai Cen ◽

Yihuai Zou ◽

Xiaowei Shi ◽

...

Keyword(s):

Cell Viability ◽

Expression Profiles ◽

Neuroprotective Effect ◽

Specific Inhibitor ◽

Annexin V ◽

Panax Notoginseng ◽

Akt Pathway ◽

Neuroprotective Effects ◽

Traditional Chinese Herbal Medicine

Context. About 15 million people worldwide suffer strokes each year and 5 million people are left with permanent disabilities which is due to the loss of local blood supply to the brain, resulting in a neurologic deficit. Panax notoginseng (Bruk.) F. H. Chen (Araliaceae) is a traditional Chinese herbal medicine widely used in the treatment of cardio-cerebrovascular diseases. Objective. This study investigated whether Panax notoginseng saponins (PNS) extracted from Panax notoginseng (Bruk.) F. H. Chen played a neuroprotective role by affecting the EGFR/PI3K/AKT pathway in oxygen-glucose deprived (OGD) SH-SY5Y cells. Materials and Methods. Different groups of OGD SH-SY5Y cells were treated with varying doses of PNS, PNS + AG1478 (a specific inhibitor of EGFR), or AG1478 for 16 hours. CCK8, Annexin V-FITC/PI apoptosis analysis, and LDH release analysis were used to determine cell viability, apoptosis rate, and amounts of LDH. Quantitative real-time PCR (q-RT-PCR) and western blotting were used to measure mRNA and proteins levels of p-EGFR/EGFR, p-PI3K/PI3K, and p-AKT/AKT in SH-SY5Y cells subjected to OGD. Results. PNS significantly enhanced cell viability, reduced apoptosis, and weakened cytotoxicity by inhibiting the release of LDH. The mRNA expression profiles of EGFR, PI3K, and AKT showed no difference between model and other groups. Additionally, ratios of p-EGFR, p-PI3K, and p-AKT to EGFR, PI3K, and AKT proteins expression, respectively, all increased significantly. Conclusions. These findings indicate that PNS enhanced neuroprotective effects by activating the EGFR/PI3K/AKT pathway and elevating phosphorylation levels in OGD SH-SY5Y cells.

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