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Haslem L, Hays JM, Hays FA. p66Shc in Cardiovascular Pathology. Cells 2022; 11:cells11111855. [PMID: 35681549 PMCID: PMC9180016 DOI: 10.3390/cells11111855] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2022] [Revised: 05/30/2022] [Accepted: 06/01/2022] [Indexed: 02/06/2023] Open
Abstract
p66Shc is a widely expressed protein that governs a variety of cardiovascular pathologies by generating, and exacerbating, pro-apoptotic ROS signals. Here, we review p66Shc’s connections to reactive oxygen species, expression, localization, and discuss p66Shc signaling and mitochondrial functions. Emphasis is placed on recent p66Shc mitochondrial function discoveries including structure/function relationships, ROS identity and regulation, mechanistic insights, and how p66Shc-cyt c interactions can influence p66Shc mitochondrial function. Based on recent findings, a new p66Shc mitochondrial function model is also put forth wherein p66Shc acts as a rheostat that can promote or antagonize apoptosis. A discussion of how the revised p66Shc model fits previous findings in p66Shc-mediated cardiovascular pathology follows.
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Affiliation(s)
- Landon Haslem
- Biochemistry and Molecular Biology Department, College of Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA; (L.H.); (J.M.H.)
| | - Jennifer M. Hays
- Biochemistry and Molecular Biology Department, College of Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA; (L.H.); (J.M.H.)
| | - Franklin A. Hays
- Biochemistry and Molecular Biology Department, College of Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA; (L.H.); (J.M.H.)
- Stephenson Center, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA
- Harold Hamm Diabetes Center, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104, USA
- Correspondence:
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Basurto-Islas G, Gu JH, Tung YC, Liu F, Iqbal K. Mechanism of Tau Hyperphosphorylation Involving Lysosomal Enzyme Asparagine Endopeptidase in a Mouse Model of Brain Ischemia. J Alzheimers Dis 2019; 63:821-833. [PMID: 29689717 DOI: 10.3233/jad-170715] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Dementias including Alzheimer's disease (AD) are multifactorial disorders that involve several different etiopathogenic mechanisms. Cerebral ischemia has been suspected in the altered regulation of protein kinases and phosphatases that leads to hyperphosphorylation of tau and further neurofibrillary pathology, a key hallmark of AD and related neurodegenerative diseases. However, the deregulation of these enzymes and their relationship with ischemia and AD remain unclear. Previously, we reported a mechanism by which the lysosomal enzyme asparagine endopeptidase (AEP) is associated with brain acidosis and AD. In this study, we subjected mice to middle cerebral artery occlusion and found that compared with wild type mice, the ischemia-induced brain injury and motor deficit in AEP-knockout mice are reduced, probably because ischemia activates AEP. AEP cleaves inhibitor 2 of protein phosphatase 2A (I2PP2A), which translocates from the neuronal nucleus to the cytoplasm and produces hyperphosphorylation of tau through inhibition of PP2A. These findings suggest a possible mechanism of tau pathology associated with ischemia.
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Affiliation(s)
- Gustavo Basurto-Islas
- Department of Neurochemistry, New York State Institute for Basic Research in Developmental Disabilities, Staten Island, NY, USA.,Division of Science and Engineering of University of Guanajuato, Campus Leon, Leon, Guanajuato, Mexico
| | - Jin-Hua Gu
- Department of Neurochemistry, New York State Institute for Basic Research in Developmental Disabilities, Staten Island, NY, USA.,Key Laboratory of Neuroregeneration of Jiangsu and Ministry of Education of China, Co-Innovation Center of Neuroregeneration, Nantong University, Jiangsu, China
| | - Yunn Chyn Tung
- Department of Neurochemistry, New York State Institute for Basic Research in Developmental Disabilities, Staten Island, NY, USA
| | - Fei Liu
- Department of Neurochemistry, New York State Institute for Basic Research in Developmental Disabilities, Staten Island, NY, USA
| | - Khalid Iqbal
- Department of Neurochemistry, New York State Institute for Basic Research in Developmental Disabilities, Staten Island, NY, USA
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3
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Elgenaidi IS, Spiers JP. Regulation of the phosphoprotein phosphatase 2A system and its modulation during oxidative stress: A potential therapeutic target? Pharmacol Ther 2019; 198:68-89. [PMID: 30797822 DOI: 10.1016/j.pharmthera.2019.02.011] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2018] [Accepted: 02/15/2019] [Indexed: 02/06/2023]
Abstract
Phosphoprotein phosphatases are of growing interest in the pathophysiology of many diseases and are often the neglected partner of protein kinases. One family member, PP2A, accounts for dephosphorylation of ~55-70% of all serine/threonine phosphosites. Interestingly, dysregulation of kinase signalling is a hallmark of many diseases in which an increase in oxidative stress is also noted. With this in mind, we assess the evidence to support oxidative stress-mediated regulation of the PP2A system In this article, we first present an overview of the PP2A system before providing an analysis of the regulation of PP2A by endogenous inhibitors, post translational modification, and miRNA. Next, a detailed critique of data implicating reactive oxygen species, ischaemia, ischaemia-reperfusion, and hypoxia in regulating the PP2A holoenzyme and associated regulators is presented. Finally, the pharmacological targeting of PP2A, its endogenous inhibitors, and enzymes responsible for its post-translational modification are covered. There is extensive evidence that oxidative stress modulates multiple components of the PP2A system, however, most of the data pertains to the catalytic subunit of PP2A. Irrespective of the underlying aetiology, free radical-mediated attenuation of PP2A activity is an emerging theme. However, in many instances, a dichotomy exists, which requires clarification and mechanistic insight. Nevertheless, this raises the possibility that pharmacological activation of PP2A, either through small molecule activators of PP2A or CIP2A/SET antagonists may be beneficial in modulating the cellular response to oxidative stress. A better understanding of which, will have wide ranging implications for cancer, heart disease and inflammatory conditions.
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Affiliation(s)
- I S Elgenaidi
- Department of Pharmacology and Therapeutics, Trinity College Dublin, Ireland
| | - J P Spiers
- Department of Pharmacology and Therapeutics, Trinity College Dublin, Ireland.
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Lajarín-Cuesta R, Nanclares C, Arranz-Tagarro JA, González-Lafuente L, Arribas RL, Araujo de Brito M, Gandía L, de Los Ríos C. Gramine Derivatives Targeting Ca(2+) Channels and Ser/Thr Phosphatases: A New Dual Strategy for the Treatment of Neurodegenerative Diseases. J Med Chem 2016; 59:6265-80. [PMID: 27280380 DOI: 10.1021/acs.jmedchem.6b00478] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
We describe the synthesis of gramine derivatives and their pharmacological evaluation as multipotent drugs for the treatment of Alzheimer's disease. An innovative multitarget approach is presented, targeting both voltage-gated Ca(2+) channels, classically studied for neurodegenerative diseases, and Ser/Thr phosphatases, which have been marginally aimed, even despite their key role in protein τ dephosphorylation. Twenty-five compounds were synthesized, and mostly their neuroprotective profile exceeded that offered by the head compound gramine. In general, these compounds reduced the entry of Ca(2+) through VGCC, as measured by Fluo-4/AM and patch clamp techniques, and protected in Ca(2+) overload-induced models of neurotoxicity, like glutamate or veratridine exposures. Furthermore, we hypothesize that these compounds decrease τ hyperphosphorylation based on the maintenance of the Ser/Thr phosphatase activity and their neuroprotection against the damage caused by okadaic acid. Hence, we propose this multitarget approach as a new and promising strategy for the treatment of neurodegenerative diseases.
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Affiliation(s)
- Rocío Lajarín-Cuesta
- Instituto Teófilo Hernando and Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid , C/Arzobispo Morcillo, 4, 28029 Madrid, Spain
| | - Carmen Nanclares
- Instituto Teófilo Hernando and Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid , C/Arzobispo Morcillo, 4, 28029 Madrid, Spain
| | - Juan-Alberto Arranz-Tagarro
- Instituto Teófilo Hernando and Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid , C/Arzobispo Morcillo, 4, 28029 Madrid, Spain
| | - Laura González-Lafuente
- Servicio de Farmacología Clínica, Instituto de Investigación Sanitaria, Hospital Universitario de la Princesa , C/Diego de León, 62, 28006 Madrid, Spain
| | - Raquel L Arribas
- Instituto Teófilo Hernando and Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid , C/Arzobispo Morcillo, 4, 28029 Madrid, Spain
| | - Monique Araujo de Brito
- Programa de Pós Graduação em Ciências Aplicadas a Produtos Para a Saúde, Faculdade de Farmácia, Universidade Federal Fluminense , Niterói, Rio de Janeiro, Brasil
| | - Luis Gandía
- Instituto Teófilo Hernando and Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid , C/Arzobispo Morcillo, 4, 28029 Madrid, Spain
| | - Cristóbal de Los Ríos
- Instituto Teófilo Hernando and Departamento de Farmacología y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid , C/Arzobispo Morcillo, 4, 28029 Madrid, Spain.,Servicio de Farmacología Clínica, Instituto de Investigación Sanitaria, Hospital Universitario de la Princesa , C/Diego de León, 62, 28006 Madrid, Spain
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Ziegler V, Albers A, Fritz G. Lovastatin protects keratinocytes from DNA damage-related pro-apoptotic stress responses stimulated by anticancer therapeutics. BIOCHIMICA ET BIOPHYSICA ACTA-MOLECULAR CELL RESEARCH 2016; 1863:1082-92. [PMID: 26876155 DOI: 10.1016/j.bbamcr.2016.02.009] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2015] [Revised: 01/29/2016] [Accepted: 02/10/2016] [Indexed: 01/14/2023]
Abstract
BACKGROUND Oral mucositis (OM) is a relevant adverse effect of anticancer therapy involving ionizing radiation (IR) and doxorubicin (Doxo). Because DNA damage of keratinocytes is causative for the pathogenesis of OM, we aim to identify pharmacological measures for geno- and cytoprotection of keratinocytes. METHODS We investigated the influence of the lipid-lowering drug lovastatin on cell death, proliferation and DNA damage response (DDR) mechanisms of human keratinocytes following treatment with IR and Doxo. RESULTS Lovastatin protected keratinocytes from the cytotoxic and genotoxic effects of IR and Doxo as shown by a diminished induction of apoptosis as well as a reduced formation and slightly improved repair of DNA damage following Doxo and IR treatment, respectively. Lovastatin selectively blocked the activation of Chk1 and ATR kinases following treatment with IR, Doxo and the ribonucleotide reductase inhibitor hydroxyurea, indicating that the statin antagonizes ATR/Chk1-regulated replicative stress responses. Part of the cytoprotective activity of lovastatin seems to rest on a delayed entry of lovastatin treated cells into S-phase. Yet, because the statin also protected non-proliferating keratinocytes from IR- and Doxo-induced cytotoxicity, cell cycle independent protective mechanisms are involved, too. CONCLUSIONS Lovastatin attenuates pro-toxic DNA damage-related responses of keratinocytes stimulated by OM-inducing anticancer therapeutics. The data encourage forthcoming in vivo and clinical studies addressing the usefulness of statins in the prevention of OM.
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Affiliation(s)
- Verena Ziegler
- Institute of Toxicology, Medical Faculty of the Heinrich Heine University Düsseldorf, Moorenstrasse 5, D-40225 Düsseldorf, Germany
| | - Anne Albers
- Institute of Toxicology, Medical Faculty of the Heinrich Heine University Düsseldorf, Moorenstrasse 5, D-40225 Düsseldorf, Germany
| | - Gerhard Fritz
- Institute of Toxicology, Medical Faculty of the Heinrich Heine University Düsseldorf, Moorenstrasse 5, D-40225 Düsseldorf, Germany.
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Garip S, Bayari SH, Severcan M, Abbas S, Lednev IK, Severcan F. Structural effects of simvastatin on liver rat [corrected] tissue: Fourier transform infrared and Raman microspectroscopic studies. JOURNAL OF BIOMEDICAL OPTICS 2016; 21:25008. [PMID: 26891599 DOI: 10.1117/1.jbo.21.2.025008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/11/2015] [Accepted: 01/21/2016] [Indexed: 06/05/2023]
Abstract
Simvastatin is one of the most frequently prescribed statins because of its efficacy in the treatment of hypercholesterolemia, reducing cardiovascular risk and related mortality. Determination of its side effects on different tissues is mandatory to improve safe use of this drug. In the present study, the effects of simvastatin on molecular composition and structure of healthy rat livers were investigated by Fourier transform infrared and Raman imaging. Simvastatin-treated groups received 50 mg/kg/day simvastatin for 30 days. The ratio of the area and/or intensity of the bands assigned to lipids, proteins, and nucleic acids were calculated to get information about the drug-induced changes in tissues. Loss of unsaturation, accumulation of end products of lipid peroxidation, and alterations in lipid-to-protein ratio were observed in the treated group. Protein secondary structure studies revealed significant decrease in α-helix and increase in random coil, while native β-sheet decreases and aggregated β-sheet increases in treated group implying simvastatin-induced protein denaturation. Moreover, groups were successfully discriminated using principal component analysis. Consequently, high-dose simvastatin treatment induces hepatic lipid peroxidation and changes in molecular content and protein secondary structure, implying the risk of liver disorders in drug therapy.
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Affiliation(s)
- Sebnem Garip
- Istanbul Kemerburgaz University, Department of Medical Biochemistry, Faculty of Medicine, Mahmutbey Dilmenler Caddesi, No: 26, Istanbul 34217, Turkey
| | - Sevgi Haman Bayari
- Hacettepe University, Department of Physics Engineering, Faculty of Engineering, Beytepe Campus, Ankara 06800, Turkey
| | - Mete Severcan
- Middle East Technical University, Department of Electrical and Electronics Engineering, Faculty of Engineering, Dumlupinar Bulvari, No: 1, Ankara 06800, Turkey
| | - Sherif Abbas
- Middle East Technical University, Department of Biological Sciences, Faculty of Arts and Sciences, Dumlupinar Bulvari, No: 1, Ankara 06800, Turkey
| | - Igor K Lednev
- University at Albany, Department of Chemistry, State University of New York, Albany, New York 12222, United States
| | - Feride Severcan
- University at Albany, Department of Chemistry, State University of New York, Albany, New York 12222, United States
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Stockwell J, Chen Z, Niazi M, Nosib S, Cayabyab FS. Protein phosphatase role in adenosine A1 receptor-induced AMPA receptor trafficking and rat hippocampal neuronal damage in hypoxia/reperfusion injury. Neuropharmacology 2015; 102:254-65. [PMID: 26626486 DOI: 10.1016/j.neuropharm.2015.11.018] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2015] [Revised: 11/19/2015] [Accepted: 11/21/2015] [Indexed: 12/19/2022]
Abstract
Adenosine signaling via A1 receptor (A1R) and A2A receptor (A2AR) has shown promise in revealing potential targets for neuroprotection in cerebral ischemia. We recently showed a novel mechanism by which A1R activation with N(6)-cyclopentyl adenosine (CPA) induced GluA1 and GluA2 AMPA receptor (AMPAR) endocytosis and adenosine-induced persistent synaptic depression (APSD) in rat hippocampus. This study further investigates the mechanism of A1R-mediated AMPAR internalization and hippocampal slice neuronal damage through activation of protein phosphatase 1 (PP1), 2A (PP2A), and 2B (PP2B) using electrophysiological, biochemical and imaging techniques. Following prolonged A1R activation, GluA2 internalization was selectively blocked by PP2A inhibitors (okadaic acid and fostriecin), whereas inhibitors of PP2A, PP1 (tautomycetin), and PP2B (FK506) all prevented GluA1 internalization. Additionally, GluA1 phosphorylation at Ser831 and Ser845 was reduced after prolonged A1R activation in hippocampal slices. PP2A inhibitors nullified A1R-mediated downregulation of pSer845-GluA1, while PP1 and PP2B inhibitors prevented pSer831-GluA1 downregulation. Each protein phosphatase inhibitor also blunted CPA-induced synaptic depression and APSD. We then tested whether A1R-mediated changes in AMPAR trafficking and APSD contribute to hypoxia-induced neuronal injury. Hypoxia (20 min) induced A1R-mediated internalization of both AMPAR subunits, and subsequent normoxic reperfusion (45 min) increased GluA1 but persistently reduced GluA2 surface expression. Neuronal damage after hypoxia-reperfusion injury was significantly blunted by pre-incubation with the above protein phosphatase inhibitors. Together, these data suggest that A1R-mediated protein phosphatase activation causes persistent synaptic depression by downregulating GluA2-containing AMPARs; this previously undefined role of A1R stimulation in hippocampal neuronal damage represents a novel therapeutic target in cerebral ischemic damage.
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Affiliation(s)
- Jocelyn Stockwell
- Department of Surgery, Neuroscience Research Group, University of Saskatchewan, Saskatoon, Saskatchewan, Canada.
| | - Zhicheng Chen
- Department of Surgery, Neuroscience Research Group, University of Saskatchewan, Saskatoon, Saskatchewan, Canada.
| | - Mina Niazi
- Department of Surgery, Neuroscience Research Group, University of Saskatchewan, Saskatoon, Saskatchewan, Canada.
| | - Siddarth Nosib
- Department of Surgery, Neuroscience Research Group, University of Saskatchewan, Saskatoon, Saskatchewan, Canada.
| | - Francisco S Cayabyab
- Department of Surgery, Neuroscience Research Group, University of Saskatchewan, Saskatoon, Saskatchewan, Canada.
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8
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Wang H, Li Y, Jiang N, Chen X, Zhang Y, Zhang K, Wang T, Hao Y, Ma L, Zhao C, Wang Y, Sun T, Yu J. Protective effect of oxysophoridine on cerebral ischemia/reperfusion injury in mice. Neural Regen Res 2014; 8:1349-59. [PMID: 25206429 PMCID: PMC4107767 DOI: 10.3969/j.issn.1673-5374.2013.15.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2013] [Accepted: 04/20/2013] [Indexed: 11/18/2022] Open
Abstract
Oxysophoridine, a new alkaloid extracted from Sophora alopecuroides L., has been shown to have a protective effect against ischemic brain damage. In this study, a focal cerebral ischemia/reperfusion injury model was established using middle cerebral artery occlusion in mice. Both 62.5, 125, and 250 mg/kg oxysophoridine, via intraperitoneal injection, and 6 mg/kg nimodipine, via intragastric administration, were administered daily for 7 days before modeling. After 24 hours of reperfusion, mice were tested for neurological deficit, cerebral infarct size was assessed and brain tissue was collected. Results showed that oxysophoridine at 125, 250 mg/kg and 6 mg/kg nimodipine could reduce neurological deficit scores, cerebral infarct size and brain water content in mice. These results provided evidence that oxysophoridine plays a protective role in cerebral ischemia/reperfusion injury. In addition, oxysophoridine at 62.5, 125, and 250 mg/kg and 6 mg/kg nimodipine increased adenosine-triphosphate content, and decreased malondialdehyde and nitric oxide content. These compounds enhanced the activities of glutathione-peroxidase, superoxide dismutase, catalase, and lactate dehydrogenase, and decreased the activity of nitric oxide synthase. Protein and mRNA expression levels of N-methyl-D-aspartate receptor subunit NR1 were markedly inhibited in the presence of 250 mg/kg oxysophoridine and 6 mg/kg nimodipine. Our experimental findings indicated that oxysophoridine has a neuroprotective effect against cerebral ischemia/reperfusion injury in mice, and that the effect may be due to its ability to inhibit oxidative stress and expression of the N-methyl-D-aspartate receptor subunit NR1.
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Affiliation(s)
- Hongbo Wang
- Department of Pharmacology, Ningxia Medical University, Yinchuan 750004, Ningxia Hui Autonomous Region, China
| | - Yuxiang Li
- College of Nursing, Ningxia Medical University, Yinchuan 750004, Ningxia Hui Autonomous Region, China ; Shanghai Pudong New Area Gongli Hospital, Shanghai 200135, China
| | - Ning Jiang
- Shanghai Pudong New Area Gongli Hospital, Shanghai 200135, China
| | - Xiaoping Chen
- Shanghai Pudong New Area Gongli Hospital, Shanghai 200135, China
| | - Yi Zhang
- Shanghai Pudong New Area Gongli Hospital, Shanghai 200135, China
| | - Kuai Zhang
- Department of Pharmacology, Ningxia Medical University, Yinchuan 750004, Ningxia Hui Autonomous Region, China
| | - Tengfei Wang
- Department of Pharmacology, Ningxia Medical University, Yinchuan 750004, Ningxia Hui Autonomous Region, China
| | - Yinju Hao
- Department of Pharmacology, Ningxia Medical University, Yinchuan 750004, Ningxia Hui Autonomous Region, China
| | - Lin Ma
- Ningxia Key Laboratory of Craniocerebral Diseases of Ningxia Hui Autonomous Region, Yinchuan 750004, Ningxia Hui Autonomous Region, China
| | - Chengjun Zhao
- School of Basic Medical Sciences, Ningxia Medical University, Yinchuan 750004, Ningxia Hui Autonomous Region, China
| | - Yanrong Wang
- Key Laboratory of Reproduction and Genetics of Ningxia Medical University, Yinchuan 750004, Ningxia Hui Autonomous Region, China
| | - Tao Sun
- Ningxia Key Laboratory of Craniocerebral Diseases of Ningxia Hui Autonomous Region, Yinchuan 750004, Ningxia Hui Autonomous Region, China
| | - Jianqiang Yu
- Department of Pharmacology, Ningxia Medical University, Yinchuan 750004, Ningxia Hui Autonomous Region, China ; Collaborative Innovation Center of Ningxia Hui Autonomous Region for Medicines, Yinchuan 750004, Ningxia Hui Autonomous Region, China
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Fernandes J, Vieira M, Carreto L, Santos MAS, Duarte CB, Carvalho AL, Santos AE. In vitro ischemia triggers a transcriptional response to down-regulate synaptic proteins in hippocampal neurons. PLoS One 2014; 9:e99958. [PMID: 24960035 PMCID: PMC4069008 DOI: 10.1371/journal.pone.0099958] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2014] [Accepted: 05/20/2014] [Indexed: 11/26/2022] Open
Abstract
Transient global cerebral ischemia induces profound changes in the transcriptome of brain cells, which is partially associated with the induction or repression of genes that influence the ischemic response. However, the mechanisms responsible for the selective vulnerability of hippocampal neurons to global ischemia remain to be clarified. To identify molecular changes elicited by ischemic insults, we subjected hippocampal primary cultures to oxygen-glucose deprivation (OGD), an in vitro model for global ischemia that resulted in delayed neuronal death with an excitotoxic component. To investigate changes in the transcriptome of hippocampal neurons submitted to OGD, total RNA was extracted at early (7 h) and delayed (24 h) time points after OGD and used in a whole-genome RNA microarray. We observed that at 7 h after OGD there was a general repression of genes, whereas at 24 h there was a general induction of gene expression. Genes related with functions such as transcription and RNA biosynthesis were highly regulated at both periods of incubation after OGD, confirming that the response to ischemia is a dynamic and coordinated process. Our analysis showed that genes for synaptic proteins, such as those encoding for PICK1, GRIP1, TARPγ3, calsyntenin-2/3, SAPAP2 and SNAP-25, were down-regulated after OGD. Additionally, OGD decreased the mRNA and protein expression levels of the GluA1 AMPA receptor subunit as well as the GluN2A and GluN2B subunits of NMDA receptors, but increased the mRNA expression of the GluN3A subunit, thus altering the composition of ionotropic glutamate receptors in hippocampal neurons. Together, our results present the expression profile elicited by in vitro ischemia in hippocampal neurons, and indicate that OGD activates a transcriptional program leading to down-regulation in the expression of genes coding for synaptic proteins, suggesting that the synaptic proteome may change after ischemia.
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Affiliation(s)
- Joana Fernandes
- CNC-Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal
- Faculty of Pharmacy, University of Coimbra, Coimbra, Portugal
| | - Marta Vieira
- CNC-Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal
- Faculty of Pharmacy, University of Coimbra, Coimbra, Portugal
| | - Laura Carreto
- RNA Biology Laboratory, Department of Biology and CESAM, University of Aveiro, Aveiro, Portugal
| | - Manuel A. S. Santos
- RNA Biology Laboratory, Department of Biology and CESAM, University of Aveiro, Aveiro, Portugal
| | - Carlos B. Duarte
- CNC-Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal
- Department of Life Sciences, Faculty of Sciences and Technology, University of Coimbra, Coimbra, Portugal
| | - Ana Luísa Carvalho
- CNC-Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal
- Department of Life Sciences, Faculty of Sciences and Technology, University of Coimbra, Coimbra, Portugal
- * E-mail:
| | - Armanda E. Santos
- CNC-Center for Neuroscience and Cell Biology, University of Coimbra, Coimbra, Portugal
- Faculty of Pharmacy, University of Coimbra, Coimbra, Portugal
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Simvastatin pretreatment protects cerebrum from neuronal injury by decreasing the expressions of phosphor-CaMK II and AQP4 in ischemic stroke rats. J Mol Neurosci 2014; 54:591-601. [PMID: 24752488 DOI: 10.1007/s12031-014-0307-6] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2014] [Accepted: 04/08/2014] [Indexed: 01/08/2023]
Abstract
Excitotoxicity and cytotoxic edema are the two major factors resulting in neuronal injury during brain ischemia and reperfusion. Ca2+/calmodulin-dependent protein kinase II (CaMK II), the downstream signal molecular of N-methyl-D-aspartate receptors (NMDARs), is a mediator in the excitotoxicity. Aquaporin 4 (AQP4), expressed mainly in the brain, is an important aquaporin to control the flux of water. In a previous study, we had reported that pretreatment of simvastatin protected the cerebrum from ischemia and reperfusion injury by decreasing neurological deficit score and infarct area (Zhu et al. PLoS One 7:e51552, 2012). The present study used a middle cerebral artery occlusion (MCAO) model to further explore the pleiotropic effect of simvastatin via CaMK II and AQP4. The results showed that simvastatin reduced degenerated cells and brain edema while decreasing the protein expressions of phosphor-CaMK II and AQP4, and increasing the ratios of Bcl-2/Bax, which was independent of cholesterol-lowering effect. Immunocomplexes formed between the subunit of NMDARs-NR3A and AQP4 were detected for the first time. It was concluded that simvastatin could protect the cerebrum from neuronal excitotoxicity and cytotoxic edema by downregulating the expressions of phosphor-CaMK II and AQP4, and that the interaction between NR3A and AQP4 might provide the base for AQP4 involving in the signaling pathways mediated by NMDARs.
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11
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Lorrio S, Romero A, González-Lafuente L, Lajarín-Cuesta R, Martínez-Sanz FJ, Estrada M, Samadi A, Marco-Contelles J, Rodríguez-Franco MI, Villarroya M, López MG, de los Ríos C. PP2A ligand ITH12246 protects against memory impairment and focal cerebral ischemia in mice. ACS Chem Neurosci 2013; 4:1267-77. [PMID: 23763493 DOI: 10.1021/cn400050p] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
ITH12246 (ethyl 5-amino-2-methyl-6,7,8,9-tetrahydrobenzo[b][1,8]naphthyridine-3-carboxylate) is a 1,8-naphthyridine described to feature an interesting neuroprotective profile in in vitro models of Alzheimer's disease. These effects were proposed to be due in part to a regulatory action on protein phosphatase 2A inhibition, as it prevented binding of its inhibitor okadaic acid. We decided to investigate the pharmacological properties of ITH12246, evaluating its ability to counteract the memory impairment evoked by scopolamine, a muscarinic antagonist described to promote memory loss, as well as to reduce the infarct volume in mice suffering phototrombosis. Prior to conducting these experiments, we confirmed its in vitro neuroprotective activity against both oxidative stress and Ca(2+) overload-derived excitotoxicity, using SH-SY5Y neuroblastoma cells and rat hippocampal slices. Using a predictive model of blood-brain barrier crossing, it seems that the passage of ITH12246 is not hindered. Its potential hepatotoxicity was observed only at very high concentrations, from 0.1 mM. ITH12246, at the concentration of 10 mg/kg i.p., was able to improve the memory index of mice treated with scopolamine, from 0.22 to 0.35, in a similar fashion to the well-known Alzheimer's disease drug galantamine 2.5 mg/kg. On the other hand, ITH12246, at the concentration of 2.5 mg/kg, reduced the phototrombosis-triggered infarct volume by 67%. In the same experimental conditions, 15 mg/kg melatonin, used as control standard, reduced the infarct volume by 30%. All of these findings allow us to consider ITH12246 as a new potential drug for the treatment of neurodegenerative diseases, which would act as a multifactorial neuroprotectant.
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Affiliation(s)
- Silvia Lorrio
- Instituto Teófilo Hernando and Departamento de Farmacología
y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, C/Arzobispo Morcillo, 4,
28029 Madrid, Spain
| | - Alejandro Romero
- Departamento de Toxicología y Farmacología,
Facultad de Veterinaria, Universidad Complutense de Madrid, Avda. Puerta del Hierro, s/n, 28040 Madrid, Spain
| | - Laura González-Lafuente
- Instituto de Investigación Sanitaria,
Servicio de Farmacología Clínica, Hospital Universitario de la Princesa, C/Diego de León,
62, 28006 Madrid, Spain
- Instituto Teófilo Hernando and Departamento de Farmacología
y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, C/Arzobispo Morcillo, 4,
28029 Madrid, Spain
| | - Rocío Lajarín-Cuesta
- Instituto Teófilo Hernando and Departamento de Farmacología
y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, C/Arzobispo Morcillo, 4,
28029 Madrid, Spain
| | - Francisco J. Martínez-Sanz
- Instituto Teófilo Hernando and Departamento de Farmacología
y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, C/Arzobispo Morcillo, 4,
28029 Madrid, Spain
| | - Martín Estrada
- Instituto de Química Médica (IQM, CSIC),
C/Juan de la Cierva, 3, 28006 Madrid, Spain
| | - Abdelouahid Samadi
- Laboratorio de Química Médica (IQOG, CSIC), C/Juan de la Cierva, 3,
28006 Madrid, Spain
| | - Jose Marco-Contelles
- Laboratorio de Química Médica (IQOG, CSIC), C/Juan de la Cierva, 3,
28006 Madrid, Spain
| | | | - Mercedes Villarroya
- Instituto de Investigación Sanitaria,
Servicio de Farmacología Clínica, Hospital Universitario de la Princesa, C/Diego de León,
62, 28006 Madrid, Spain
- Instituto Teófilo Hernando and Departamento de Farmacología
y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, C/Arzobispo Morcillo, 4,
28029 Madrid, Spain
| | - Manuela G. López
- Instituto de Investigación Sanitaria,
Servicio de Farmacología Clínica, Hospital Universitario de la Princesa, C/Diego de León,
62, 28006 Madrid, Spain
- Instituto Teófilo Hernando and Departamento de Farmacología
y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, C/Arzobispo Morcillo, 4,
28029 Madrid, Spain
| | - Cristóbal de los Ríos
- Instituto de Investigación Sanitaria,
Servicio de Farmacología Clínica, Hospital Universitario de la Princesa, C/Diego de León,
62, 28006 Madrid, Spain
- Instituto Teófilo Hernando and Departamento de Farmacología
y Terapéutica, Facultad de Medicina, Universidad Autónoma de Madrid, C/Arzobispo Morcillo, 4,
28029 Madrid, Spain
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