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Salikhova DI, Timofeeva AV, Golovicheva VV, Fatkhudinov TK, Shevtsova YA, Soboleva AG, Fedorov IS, Goryunov KV, Dyakonov AS, Mokrousova VO, Shedenkova MO, Elchaninov AV, Makhnach OV, Kutsev SI, Chekhonin VP, Silachev DN, Goldshtein DV. Extracellular vesicles of human glial cells exert neuroprotective effects via brain miRNA modulation in a rat model of traumatic brain injury. Sci Rep 2023; 13:20388. [PMID: 37989873 PMCID: PMC10663567 DOI: 10.1038/s41598-023-47627-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2023] [Accepted: 11/16/2023] [Indexed: 11/23/2023] Open
Abstract
Stem cell-based therapeutic approaches for neurological disorders are widely studied. Paracrine factors secreted by stem cells in vitro and delivered intranasally might allow bypassing the disadvantages associated with a surgical cell delivery procedure with likely immune rejection of a transplant. In this study, we investigated the therapeutic effect of the extracellular vesicles secreted by glial progenitor cells (GPC-EV) derived from human induced pluripotent stem cell in a traumatic brain injury model. Intranasal administration of GPC-EV to Wistar rats for 6 days improved sensorimotor functions assessed over a 14-day observation period. Beside, deep sequencing of microRNA transcriptome of GPC-EV was estimate, and was revealed 203 microRNA species that might be implicated in prevention of various brain pathologies. Modulation of microRNA pools might contribute to the observed decrease in the number of astrocytes that inhibit neurorecovery processes while enhancing neuroplasticity by decreasing phosphorylated Tau forms, preventing inflammation and apoptosis associated with secondary damage to brain tissue. The course of GPC-EV administration was promoted the increasing protein levels of NF-κB in studied areas of the rat brain, indicating NF-κB dependent mechanisms as a plausible route of neuroprotection within the damaged area. This investigation showed that GPC-EV may be representing a therapeutic approach in traumatic brain injury, though its translation into the clinic would require an additional research and development.
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Affiliation(s)
- Diana I Salikhova
- Institute of Molecular and Cellular Medicine, Medical Institute, RUDN University, Moscow, Russian Federation, 117198.
- Research Centre for Medical Genetics, Moscow, Russian Federation, 115522.
| | - Angelika V Timofeeva
- V.I. Kulakov National Medical Research Center of Obstetrics, Gynecology and Perinatology, Moscow, Russian Federation, 117997
| | - Victoria V Golovicheva
- A.N. Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, Russian Federation, 119992
| | - Timur Kh Fatkhudinov
- Institute of Molecular and Cellular Medicine, Medical Institute, RUDN University, Moscow, Russian Federation, 117198
- Avtsyn Research Institute of Human Morphology of Federal State Budgetary Scientific Institution "Petrovsky National Research Centre of Surgery", Moscow, Russian Federation, 117418
| | - Yulia A Shevtsova
- V.I. Kulakov National Medical Research Center of Obstetrics, Gynecology and Perinatology, Moscow, Russian Federation, 117997
- Faculty of Bioengineering and Bioinformatics, Lomonosov Moscow State University, Moscow, Russian Federation, 119234
| | - Anna G Soboleva
- Institute of Molecular and Cellular Medicine, Medical Institute, RUDN University, Moscow, Russian Federation, 117198
- Avtsyn Research Institute of Human Morphology of Federal State Budgetary Scientific Institution "Petrovsky National Research Centre of Surgery", Moscow, Russian Federation, 117418
| | - Ivan S Fedorov
- V.I. Kulakov National Medical Research Center of Obstetrics, Gynecology and Perinatology, Moscow, Russian Federation, 117997
| | - Kirill V Goryunov
- V.I. Kulakov National Medical Research Center of Obstetrics, Gynecology and Perinatology, Moscow, Russian Federation, 117997
| | | | | | - Margarita O Shedenkova
- Institute of Molecular and Cellular Medicine, Medical Institute, RUDN University, Moscow, Russian Federation, 117198
- Research Centre for Medical Genetics, Moscow, Russian Federation, 115522
| | - Andrey V Elchaninov
- Avtsyn Research Institute of Human Morphology of Federal State Budgetary Scientific Institution "Petrovsky National Research Centre of Surgery", Moscow, Russian Federation, 117418
| | - Oleg V Makhnach
- Research Centre for Medical Genetics, Moscow, Russian Federation, 115522
| | - Sergey I Kutsev
- Research Centre for Medical Genetics, Moscow, Russian Federation, 115522
| | - Vladimir P Chekhonin
- The Serbsky State Scientific Center for Social and Forensic Psychiatry, Moscow, Russian Federation, 119034
| | - Denis N Silachev
- A.N. Belozersky Institute of Physico-Chemical Biology, Lomonosov Moscow State University, Moscow, Russian Federation, 119992.
| | - Dmitry V Goldshtein
- Institute of Molecular and Cellular Medicine, Medical Institute, RUDN University, Moscow, Russian Federation, 117198
- Research Centre for Medical Genetics, Moscow, Russian Federation, 115522
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Lietzau G, Sienkiewicz W, Karwacki Z, Dziewiątkowski J, Kaleczyc J, Kowiański P. The Effect of Simvastatin on the Dynamics of NF-κB-Regulated Neurodegenerative and Neuroprotective Processes in the Acute Phase of Ischemic Stroke. Mol Neurobiol 2023; 60:4935-4951. [PMID: 37204689 PMCID: PMC10415422 DOI: 10.1007/s12035-023-03371-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2023] [Accepted: 04/27/2023] [Indexed: 05/20/2023]
Abstract
Statins are lipid-lowering drugs that act by inhibiting 3-hydroxy-3-methylglutaryl coenzyme A reductase, a rate-limiting enzyme in cholesterol biosynthesis. Animal studies have shown neuroprotective effects of statins in cerebral stroke. However, the underlying mechanisms are not fully understood. The nuclear factor-kappa B (NF-κB) transcription factor is involved in the regulation of apoptosis in stroke. Different dimers of NF-κB regulate the gene expression of proteins involved in both neurodegeneration and neuroprotection. We aimed to determine whether simvastatin improves stroke outcome via inhibition of the RelA/p65-containing subunit and downregulation of stroke-induced pro-apoptotic genes or via activation of NF-κB dimers containing the c-Rel subunit and upregulation of anti-apoptotic genes during the acute stroke phase. Eighteen-month-old Wistar rats, subjected to permanent MCAO or sham surgery, were administered simvastatin (20 mg/kg b.w.) or saline for 5 days before the procedure. Stroke outcome was determined by measuring cerebral infarct and assessing motor functions. The expression of NF-κB subunits in various cell populations was investigated using immunofluorescence/confocal microscopy. RelA and c-Rel were detected by WB. The NF-κB-DNA binding activity was investigated using EMSA, and expression of Noxa, Puma, Bcl-2, and Bcl-x genes was analyzed by qRT-PCR. Results showed a 50% infarct size reduction and significant motor function improvement in the simvastatin-treated animals which correlated with a decrease in RelA and a transient increase in the c-Rel level in the nucleus, normalization of the NF-κB-DNA binding activity, and downregulation of the NF-κB-regulated genes. Our results provide new insights into the statin-mediated neuroprotective action against stroke based on NF-κB pathway inhibition.
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Affiliation(s)
- Grazyna Lietzau
- Division of Anatomy and Neurobiology, Faculty of Medicine, Medical University of Gdańsk, Dębinki 1, 80-211 Gdańsk, Poland
| | - Waldemar Sienkiewicz
- Department of Animal Anatomy, Faculty of Veterinary Medicine, University of Warmia and Mazury, Oczapowskiego 13, 10-719 Olsztyn, Poland
| | - Zbigniew Karwacki
- Department of Neuroanaesthesiology, Faculty of Medicine, Medical University of Gdańsk, Dębinki 7, 80-211 Gdańsk, Poland
| | - Jerzy Dziewiątkowski
- Division of Anatomy and Neurobiology, Faculty of Medicine, Medical University of Gdańsk, Dębinki 1, 80-211 Gdańsk, Poland
| | - Jerzy Kaleczyc
- Department of Animal Anatomy, Faculty of Veterinary Medicine, University of Warmia and Mazury, Oczapowskiego 13, 10-719 Olsztyn, Poland
| | - Przemysław Kowiański
- Division of Anatomy and Neurobiology, Faculty of Medicine, Medical University of Gdańsk, Dębinki 1, 80-211 Gdańsk, Poland
- Institute of Health Sciences, Pomeranian University in Słupsk, Bohaterów Westerplatte 64, 76-200 Słupsk, Poland
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Sun L, Gao W, Liu J, Wang J, Li L, Yu H, Xu ZP. O 2-Supplying Nanozymes Alleviate Hypoxia and Deplete Lactate to Eliminate Tumors and Activate Antitumor Immunity. ACS Appl Mater Interfaces 2022; 14:56644-56657. [PMID: 36515637 DOI: 10.1021/acsami.2c18960] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
Abstract
Direct hypoxia alleviation and lactate depletion in the tumor microenvironment (TME) are promising for effective cancer therapy but still very challenging. To address this challenge, the current research directly reshapes the TME for inhibiting tumor growth and activating the antitumor immunity using a drug-free nanozyme. Herein, the acid-sensitive nanozymes were constructed based on peroxidized layered double hydroxide nanoparticles for O2 self-supply and self-boosted lactate depletion. The coloading of partially cross-linked catalase and lactate oxidase enabled the acid-sensitive nanozymes to promote three reactions, that is, (1) H2O2 generation from MgO2 hydrolysis (30% at pH 7.4 vs 63% at pH 6.0 in 8 h); (2) O2 generation from H2O2 (12% at pH 7.4 vs 21% at pH 6.0 in 2 h); and (3) lactate depletion by in situ generated O2 (50% under hypoxia vs 75% under normoxia in 24 h in vitro) in parallel or tandem. These promoted reactions together efficiently induced colon cancer cell apoptosis under the hypoxic conditions, significantly inhibited tumor growth (>95%), and suppressed distant tumor growth upon seven administrations in every 3 days and moreover transformed the immunosuppressive tumor into "hot" one in the colon tumor-bearing mouse model. This is the first example for a nanozyme that supplies sufficient O2 for hypoxia relief and lactate depletion, thus providing a new insight into drug-free nanomaterial-mediated TME-targeted cancer therapy.
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Affiliation(s)
- Luyao Sun
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD4072Australia
| | - Wendong Gao
- Centre for Biomedical Technologies, Queensland University of Technology, Brisbane, QLD4059, Australia
| | - Jie Liu
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD4072Australia
| | - Jingjing Wang
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD4072Australia
| | - Li Li
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD4072Australia
| | - Haijun Yu
- State Key Laboratory of Drug Research & Center of Pharmaceutics, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 501 Haike Road, Shanghai201203, China
| | - Zhi Ping Xu
- Australian Institute for Bioengineering and Nanotechnology, The University of Queensland, Brisbane, QLD4072Australia
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Balion Z, Ramanauskienė K, Jekabsone A, Majienė D. The Role of Mitochondria in Brain Cell Protection from Ischaemia by Differently Prepared Propolis Extracts. Antioxidants (Basel) 2020; 9:antiox9121262. [PMID: 33322707 PMCID: PMC7763930 DOI: 10.3390/antiox9121262] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2020] [Revised: 12/06/2020] [Accepted: 12/11/2020] [Indexed: 12/12/2022] Open
Abstract
Mitochondria are both the primary targets and mediators of ischaemic damage in brain cells. Insufficient oxygen causes reactive oxygen species that damage the mitochondria, leading to the loss of functionality and viability of highly energy-demanding neurons. We have recently found that aqueous (AqEP), polyethylene glycol-aqueous (Pg-AqEP) and ethanolic propolis extracts (EEP) can modulate mitochondria and ROS production in C6 cells of astrocytic origin. The aim of this study was to investigate the effect of the extracts on viability, mitochondrial efficiency and superoxide generation, and inflammatory cytokine release in primary rat cerebellar neuronal-glial cell cultures affected by ischaemia (mimicked by hypoxia +/- deoxyglucose). AqEP and Pg-AqEP (15-60 µg/mL of phenolic compounds, or PC) significantly increased neuronal viability in ischaemia-treated cultures, and this was accompanied by a reduction in mitochondrial superoxide levels. Less extended protection against ischaemia-induced superoxide production and death was exhibited by 2 to 4 µg/mL of PC EEP. Both Pg-AqEP and Ag-EP (but not EEP) significantly protected the cultures from hypoxia-induced elevation of TNF-α, IL-1β and IL-6. Only Pg-AqEP (but not AqEP or EEP) prevented hypoxia-induced loss of the mitochondrial basal and ATP-coupled respiration rate, and significantly increased the mitochondrial respiratory capacity. Summarising, the study revealed that hydrophilic propolis extracts might protect brain cells against ischaemic injury by decreasing the level of mitochondrial superoxide and preventing inflammatory cytokines, and, in the case of Pg-AqEP, by protecting mitochondrial function.
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Affiliation(s)
- Zbigniev Balion
- Laboratory of Pharmaceutical Sciences, Institute of Pharmaceutical Technologies, Lithuanian University of Health Sciences, Sukilėlių ave. 13, LT 50162 Kaunas, Lithuania; (Z.B.); (A.J.)
- Laboratory of Biochemistry, Neuroscience Institute, Lithuanian University of Health Sciences, Eivenių str. 4, LT-50161 Kaunas, Lithuania
| | - Kristina Ramanauskienė
- Department of Clinical Pharmacy, Lithuanian University of Health Sciences, Sukilėlių ave. 13, LT 50162 Kaunas, Lithuania;
| | - Aistė Jekabsone
- Laboratory of Pharmaceutical Sciences, Institute of Pharmaceutical Technologies, Lithuanian University of Health Sciences, Sukilėlių ave. 13, LT 50162 Kaunas, Lithuania; (Z.B.); (A.J.)
- Laboratory of Preclinical Drug Investigation, Institute of Cardiology, Lithuanian University of Health Sciences, Sukilėlių ave. 13, LT-50162 Kaunas, Lithuania
| | - Daiva Majienė
- Laboratory of Biochemistry, Neuroscience Institute, Lithuanian University of Health Sciences, Eivenių str. 4, LT-50161 Kaunas, Lithuania
- Department of Drug Technology and Social Pharmacy, Lithuanian University of Health Sciences, Sukilėlių ave. 13, LT 50162 Kaunas, Lithuania
- Correspondence: ; Tel.: +370-615-23993
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6
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N Kolodkin A, Sharma RP, Colangelo AM, Ignatenko A, Martorana F, Jennen D, Briedé JJ, Brady N, Barberis M, Mondeel TDGA, Papa M, Kumar V, Peters B, Skupin A, Alberghina L, Balling R, Westerhoff HV. ROS networks: designs, aging, Parkinson's disease and precision therapies. NPJ Syst Biol Appl 2020; 6:34. [PMID: 33106503 PMCID: PMC7589522 DOI: 10.1038/s41540-020-00150-w] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Accepted: 08/28/2020] [Indexed: 12/11/2022] Open
Abstract
How the network around ROS protects against oxidative stress and Parkinson's disease (PD), and how processes at the minutes timescale cause disease and aging after decades, remains enigmatic. Challenging whether the ROS network is as complex as it seems, we built a fairly comprehensive version thereof which we disentangled into a hierarchy of only five simpler subnetworks each delivering one type of robustness. The comprehensive dynamic model described in vitro data sets from two independent laboratories. Notwithstanding its five-fold robustness, it exhibited a relatively sudden breakdown, after some 80 years of virtually steady performance: it predicted aging. PD-related conditions such as lack of DJ-1 protein or increased α-synuclein accelerated the collapse, while antioxidants or caffeine retarded it. Introducing a new concept (aging-time-control coefficient), we found that as many as 25 out of 57 molecular processes controlled aging. We identified new targets for "life-extending interventions": mitochondrial synthesis, KEAP1 degradation, and p62 metabolism.
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Affiliation(s)
- Alexey N Kolodkin
- Infrastructure for Systems Biology Europe (ISBE.NL), Amsterdam, The Netherlands.
- Luxembourg Centre for Systems Biomedicine, University of Luxembourg, Esch-sur-Alzette, Luxembourg.
- Molecular Cell Physiology, VU University Amsterdam, Amsterdam, The Netherlands.
- Synthetic Systems Biology and Nuclear Organization, Swammerdam Institute for Life Sciences, University of Amsterdam, Amsterdam, The Netherlands.
| | - Raju Prasad Sharma
- Molecular Cell Physiology, VU University Amsterdam, Amsterdam, The Netherlands
- Environmental Engineering Laboratory, Departament d'Enginyeria Quimica, Universitat Rovira i Virgili, Tarragona, Spain
| | - Anna Maria Colangelo
- Infrastructure for Systems Biology Europe (ISBE.IT), Milan, Italy
- SysBio Centre of Systems Biology (ISBE.IT), University of Milano-Bicocca, Milan, Italy
- Laboratory of Neuroscience "R Levi-Montalcini" Dept of Biotechnology and Biosciences, University of Milano-Bicocca, Milan, Italy
| | - Andrew Ignatenko
- Luxembourg Institute of Science and Technology (LIST), Esch-sur-Alzette, Luxembourg
| | - Francesca Martorana
- Infrastructure for Systems Biology Europe (ISBE.IT), Milan, Italy
- SysBio Centre of Systems Biology (ISBE.IT), University of Milano-Bicocca, Milan, Italy
- Laboratory of Neuroscience "R Levi-Montalcini" Dept of Biotechnology and Biosciences, University of Milano-Bicocca, Milan, Italy
| | - Danyel Jennen
- Department of Toxicogenomics, GROW School for Oncology and Developmental Biology, Maastricht University, Maastricht, The Netherlands
| | - Jacco J Briedé
- Department of Toxicogenomics, GROW School for Oncology and Developmental Biology, Maastricht University, Maastricht, The Netherlands
| | - Nathan Brady
- Department of Molecular Microbiology & Immunology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
| | - Matteo Barberis
- Synthetic Systems Biology and Nuclear Organization, Swammerdam Institute for Life Sciences, University of Amsterdam, Amsterdam, The Netherlands
- Systems Biology, School of Biosciences and Medicine, Faculty of Health and Medical Sciences, University of Surrey, Surrey, UK
- Centre for Mathematical and Computational Biology, CMCB, University of Surrey, Surrey, UK
| | - Thierry D G A Mondeel
- Synthetic Systems Biology and Nuclear Organization, Swammerdam Institute for Life Sciences, University of Amsterdam, Amsterdam, The Netherlands
- Systems Biology, School of Biosciences and Medicine, Faculty of Health and Medical Sciences, University of Surrey, Surrey, UK
- Centre for Mathematical and Computational Biology, CMCB, University of Surrey, Surrey, UK
| | - Michele Papa
- SysBio Centre of Systems Biology (ISBE.IT), University of Milano-Bicocca, Milan, Italy
- Infrastructure for Systems Biology Europe (ISBE.IT), Naples, Italy
- Department of Mental and Physical Health, University of Campania-L. Vanvitelli, Napoli, Italia
| | - Vikas Kumar
- Environmental Engineering Laboratory, Departament d'Enginyeria Quimica, Universitat Rovira i Virgili, Tarragona, Spain
- IISPV, Hospital Universitari Sant Joan de Reus, Universitat Rovira I Virgili, Reus, Spain
| | - Bernhard Peters
- Faculty of Science, Technology and Communication, University of Luxembourg, Esch-sur-Alzette, Luxembourg
| | - Alexander Skupin
- Luxembourg Centre for Systems Biomedicine, University of Luxembourg, Esch-sur-Alzette, Luxembourg
| | - Lilia Alberghina
- Infrastructure for Systems Biology Europe (ISBE.IT), Milan, Italy
- SysBio Centre of Systems Biology (ISBE.IT), University of Milano-Bicocca, Milan, Italy
| | - Rudi Balling
- Luxembourg Centre for Systems Biomedicine, University of Luxembourg, Esch-sur-Alzette, Luxembourg
| | - Hans V Westerhoff
- Infrastructure for Systems Biology Europe (ISBE.NL), Amsterdam, The Netherlands.
- Molecular Cell Physiology, VU University Amsterdam, Amsterdam, The Netherlands.
- Synthetic Systems Biology and Nuclear Organization, Swammerdam Institute for Life Sciences, University of Amsterdam, Amsterdam, The Netherlands.
- Manchester Centre for Integrative Systems Biology, School for Chemical Engineering and Analytical Science, The University of Manchester, Manchester, UK.
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Ma D, Lian F, Wang X. PLCG2 promotes hepatocyte proliferation in vitro via NF-κB and ERK pathway by targeting bcl2, myc and ccnd1. Artif Cells Nanomed Biotechnol 2020; 47:3786-3792. [PMID: 31549850 DOI: 10.1080/21691401.2019.1669616] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Phospholipase Cγ2 (PLCG2) has been implicated in the regulation of cell proliferation, transformation, and tumor growth. In this study, we investigate the mechanism of PLCG2 action using a short interference RNA (siRNA) method. The effects of PLCG2 on rat liver BRL-3A cells treated siRNA were studied by 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2-H-tetrazolium bromide (MTT assay), bromodeoxyuridine (BrdU) labelling assay, flow cytometry method (FCM), quantitative real-time polymerase chain reaction (qRT-PCR) and western blot. The results showed when PLCG2 was reduced, cell vitality and proliferation rate were significantly decreased (p < .05 vs. control). FCM analysis showed that the number of cell division phase (G2 + M) was declined (p < .05 vs. control). RT-PCR and western blot revealed that the expression of signalling related genes NF-κB, FOS, JUN and ELK, target genes BCL2, CCNB1 and CCND1 were remarkably down-regulated in cells treated with PLCG2 siRNAs. Based on these results, we conclude PLCG2 plays an important role in rat liver cell proliferation via ERK and NF-κB pathway by regulating the expression of BCl2, MYC and CCND1.
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Affiliation(s)
- Donghui Ma
- Department of Interventional Radiology and Vascular Surgery, The First Affiliated Hospital of Jinan University , Guangzhou , Guangdong , China
| | - Fang Lian
- Department of Clinical Laboratory, The Second Affiliated Hospital of Hainan Medical University , Haikou , Hainan , China
| | - Xiaobai Wang
- Department of Interventional Radiology and Vascular Surgery, The First Affiliated Hospital of Jinan University , Guangzhou , Guangdong , China
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Shu Z, Yang Y, Ding Z, Wang W, Zhong R, Xia T, Li W, Kuang H, Wang Y, Sun X. Structural characterization and cardioprotective activity of a novel polysaccharide from Fructus aurantii. Int J Biol Macromol 2020; 144:847-856. [DOI: 10.1016/j.ijbiomac.2019.09.162] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Revised: 08/22/2019] [Accepted: 09/22/2019] [Indexed: 12/18/2022]
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Madan E, Parker TM, Pelham CJ, Palma AM, Peixoto ML, Nagane M, Chandaria A, Tomás AR, Canas-Marques R, Henriques V, Galzerano A, Cabral-Teixeira J, Selvendiran K, Kuppusamy P, Carvalho C, Beltran A, Moreno E, Pati UK, Gogna R. HIF-transcribed p53 chaperones HIF-1α. Nucleic Acids Res 2019; 47:10212-10234. [PMID: 31538203 PMCID: PMC6821315 DOI: 10.1093/nar/gkz766] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2019] [Revised: 08/14/2019] [Accepted: 09/02/2019] [Indexed: 02/06/2023] Open
Abstract
Chronic hypoxia is associated with a variety of physiological conditions such as rheumatoid arthritis, ischemia/reperfusion injury, stroke, diabetic vasculopathy, epilepsy and cancer. At the molecular level, hypoxia manifests its effects via activation of HIF-dependent transcription. On the other hand, an important transcription factor p53, which controls a myriad of biological functions, is rendered transcriptionally inactive under hypoxic conditions. p53 and HIF-1α are known to share a mysterious relationship and play an ambiguous role in the regulation of hypoxia-induced cellular changes. Here we demonstrate a novel pathway where HIF-1α transcriptionally upregulates both WT and MT p53 by binding to five response elements in p53 promoter. In hypoxic cells, this HIF-1α-induced p53 is transcriptionally inefficient but is abundantly available for protein-protein interactions. Further, both WT and MT p53 proteins bind and chaperone HIF-1α to stabilize its binding at its downstream DNA response elements. This p53-induced chaperoning of HIF-1α increases synthesis of HIF-regulated genes and thus the efficiency of hypoxia-induced molecular changes. This basic biology finding has important implications not only in the design of anti-cancer strategies but also for other physiological conditions where hypoxia results in disease manifestation.
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Affiliation(s)
- Esha Madan
- Champalimaud Centre for the Unknown, 1400-038 Lisbon, Portugal
| | - Taylor M Parker
- Department of Surgery, Simon Cancer Research Center, Indiana University School of Medicine, Indianapolis, IN 46202, USA
| | - Christopher J Pelham
- Center for Clinical Pharmacology, Washington University School of Medicine and St. Louis College of Pharmacy, St. Louis, MO 63110, USA
| | - Antonio M Palma
- Champalimaud Centre for the Unknown, 1400-038 Lisbon, Portugal
| | - Maria L Peixoto
- Champalimaud Centre for the Unknown, 1400-038 Lisbon, Portugal
| | - Masaki Nagane
- Department of Biochemistry, School of Veterinary Medicine, Azabu University, 1-17-71 Fuchinobe, Chuo-ku, Sagamihara, Kanagawa, 252-5201, Japan
| | - Aliya Chandaria
- Biosciences unit, College of Life and Environmental Sciences, University of Exeter, Stocker Road Exeter EX4 4QD, UK
| | - Ana R Tomás
- Champalimaud Centre for the Unknown, 1400-038 Lisbon, Portugal
| | | | | | | | | | - Karuppaiyah Selvendiran
- Division of Gynecologic Oncology, Comprehensive Cancer Center, The Ohio State University Wexner Medical Center, Columbus, OH, USA
| | - Periannan Kuppusamy
- Department of Radiology and Medicine, 601 Rubin Building, Norris Cotton Cancer Center, Geisel School of Medicine, Dartmouth College, 1 Medical Center Drive, Lebanon, NH 03756, USA
| | - Carlos Carvalho
- Champalimaud Centre for the Unknown, 1400-038 Lisbon, Portugal
| | - Antonio Beltran
- Champalimaud Centre for the Unknown, 1400-038 Lisbon, Portugal
| | - Eduardo Moreno
- Champalimaud Centre for the Unknown, 1400-038 Lisbon, Portugal
| | - Uttam K Pati
- Transcription and Human Biology Laboratory, School of Biotechnology, Jawaharlal Nehru University, New Delhi 110067, India
| | - Rajan Gogna
- Champalimaud Centre for the Unknown, 1400-038 Lisbon, Portugal
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Chen H, Lin W, Lin P, Zheng M, Lai Y, Chen M, Zhang Y, Chen J, Lin X, Lin L, Lan Q, Yuan Q, Chen R, Jiang X, Xiao Y, Liu N. IL-10 produces a dual effect on OGD-induced neuronal apoptosis of cultured cortical neurons via the NF-κB pathway. Aging (Albany NY) 2019; 11:10796-10813. [PMID: 31801113 PMCID: PMC6932931 DOI: 10.18632/aging.102411] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2019] [Accepted: 11/19/2019] [Indexed: 12/15/2022]
Abstract
As a classic immunoregulatory cytokine, interleukin-10 (IL-10) can provide in vivo and in vitro neuroprotection respectively during cerebral ischemia and after the oxygen-glucose deprivation (OGD)-induced injury. However, its role in cortical neuronal survival at different post-ischemic phases remains unclear. The current study found that IL-10 had distinct effects on the neuronal apoptosis at different OGD stages: at an early stage after OGD, IL-10 promoted the OGD-induced neuronal apoptosis in the cultured primary cortical neurons by activating p65 subunit, which up-regulated Bax expression and down-regulated Bcl-xL expression; at a late OGD stage, however, it attenuated the OGD-induced neuronal apoptosis by activating c-Rel, which up-regulated Bcl-xL expression and down-regulated Bax expression. The early-stage pro-apoptosis and late-stage anti-apoptosis were both partly abolished by PDTC, an NF-κB inhibitor, and promoted by PMA, an NF-κB activator. The optimal anti-apoptotic effect appeared when the cultured neurons were treated with IL-10 at 9-24 h after OGD. Taken together, our findings suggest that IL-10 exerts a dual effect on the survival of the cultured neurons by activating the NF-κB pathway at different stages after OGD injury and that PMA treatment at a late stage can facilitate the IL-10-conferred neuroprotection against OGD-induced neuronal injury.
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Affiliation(s)
- Hongbin Chen
- Department of Neurology, Fujian Medical University Union Hospital, Fuzhou, China.,Institute of Cerebral Vascular Diseases of Fujian Province, Fuzhou, China.,Key Laboratory of Brain Aging and Neurodegenerative Diseases, Fujian Key Laboratory of Molecular Neurology, Fujian Medical University, Fuzhou, China
| | - Wei Lin
- Department of Neurology, Fujian Medical University Union Hospital, Fuzhou, China.,Institute of Cerebral Vascular Diseases of Fujian Province, Fuzhou, China.,Key Laboratory of Brain Aging and Neurodegenerative Diseases, Fujian Key Laboratory of Molecular Neurology, Fujian Medical University, Fuzhou, China
| | - Peiqiang Lin
- Department of Neurology, Fujian Medical University Union Hospital, Fuzhou, China.,Institute of Cerebral Vascular Diseases of Fujian Province, Fuzhou, China.,Key Laboratory of Brain Aging and Neurodegenerative Diseases, Fujian Key Laboratory of Molecular Neurology, Fujian Medical University, Fuzhou, China
| | - Mouwei Zheng
- Department of Neurology, Fujian Medical University Union Hospital, Fuzhou, China.,Institute of Cerebral Vascular Diseases of Fujian Province, Fuzhou, China.,Key Laboratory of Brain Aging and Neurodegenerative Diseases, Fujian Key Laboratory of Molecular Neurology, Fujian Medical University, Fuzhou, China
| | - Yongxing Lai
- Department of Neurology, Fujian Medical University Union Hospital, Fuzhou, China.,Institute of Cerebral Vascular Diseases of Fujian Province, Fuzhou, China.,Key Laboratory of Brain Aging and Neurodegenerative Diseases, Fujian Key Laboratory of Molecular Neurology, Fujian Medical University, Fuzhou, China
| | - Manli Chen
- Department of Neurology, Fujian Medical University Union Hospital, Fuzhou, China.,Institute of Cerebral Vascular Diseases of Fujian Province, Fuzhou, China.,Key Laboratory of Brain Aging and Neurodegenerative Diseases, Fujian Key Laboratory of Molecular Neurology, Fujian Medical University, Fuzhou, China
| | - Yixian Zhang
- Department of Rehabilitation, Fujian Medical University Union Hospital, Fuzhou, China.,Institute of Cerebral Vascular Diseases of Fujian Province, Fuzhou, China.,Key Laboratory of Brain Aging and Neurodegenerative Diseases, Fujian Key Laboratory of Molecular Neurology, Fujian Medical University, Fuzhou, China
| | - Jianhao Chen
- Department of Neurology, Fujian Medical University Union Hospital, Fuzhou, China.,Institute of Cerebral Vascular Diseases of Fujian Province, Fuzhou, China.,Key Laboratory of Brain Aging and Neurodegenerative Diseases, Fujian Key Laboratory of Molecular Neurology, Fujian Medical University, Fuzhou, China
| | - Xiaohui Lin
- Department of Neurology, Fujian Medical University Union Hospital, Fuzhou, China.,Institute of Cerebral Vascular Diseases of Fujian Province, Fuzhou, China.,Key Laboratory of Brain Aging and Neurodegenerative Diseases, Fujian Key Laboratory of Molecular Neurology, Fujian Medical University, Fuzhou, China
| | - Longzai Lin
- Department of Neurology, Fujian Medical University Union Hospital, Fuzhou, China.,Institute of Cerebral Vascular Diseases of Fujian Province, Fuzhou, China.,Key Laboratory of Brain Aging and Neurodegenerative Diseases, Fujian Key Laboratory of Molecular Neurology, Fujian Medical University, Fuzhou, China
| | - Quan Lan
- Department of Neurology, Fujian Medical University Union Hospital, Fuzhou, China.,Institute of Cerebral Vascular Diseases of Fujian Province, Fuzhou, China.,Key Laboratory of Brain Aging and Neurodegenerative Diseases, Fujian Key Laboratory of Molecular Neurology, Fujian Medical University, Fuzhou, China.,Department of Neurology, The First Affiliated Hospital of Xiamen University, Xiamen, China
| | - Qilin Yuan
- Department of Neurology, Fujian Medical University Union Hospital, Fuzhou, China.,Institute of Cerebral Vascular Diseases of Fujian Province, Fuzhou, China.,Key Laboratory of Brain Aging and Neurodegenerative Diseases, Fujian Key Laboratory of Molecular Neurology, Fujian Medical University, Fuzhou, China
| | - Ronghua Chen
- Department of Neurology, Fujian Medical University Union Hospital, Fuzhou, China.,Institute of Cerebral Vascular Diseases of Fujian Province, Fuzhou, China.,Key Laboratory of Brain Aging and Neurodegenerative Diseases, Fujian Key Laboratory of Molecular Neurology, Fujian Medical University, Fuzhou, China
| | - Xinhong Jiang
- Department of Rehabilitation, Fujian Medical University Union Hospital, Fuzhou, China.,Institute of Cerebral Vascular Diseases of Fujian Province, Fuzhou, China.,Key Laboratory of Brain Aging and Neurodegenerative Diseases, Fujian Key Laboratory of Molecular Neurology, Fujian Medical University, Fuzhou, China
| | - Yingchun Xiao
- Department of Neurology, Fujian Medical University Union Hospital, Fuzhou, China.,Institute of Cerebral Vascular Diseases of Fujian Province, Fuzhou, China.,Key Laboratory of Brain Aging and Neurodegenerative Diseases, Fujian Key Laboratory of Molecular Neurology, Fujian Medical University, Fuzhou, China
| | - Nan Liu
- Department of Neurology, Fujian Medical University Union Hospital, Fuzhou, China.,Department of Rehabilitation, Fujian Medical University Union Hospital, Fuzhou, China.,Institute of Cerebral Vascular Diseases of Fujian Province, Fuzhou, China.,Key Laboratory of Brain Aging and Neurodegenerative Diseases, Fujian Key Laboratory of Molecular Neurology, Fujian Medical University, Fuzhou, China
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11
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Ye J, Das S, Roy A, Wei W, Huang H, Lorenz-Guertin JM, Xu Q, Jacob TC, Wang B, Sun D, Wang QJ. Ischemic Injury-Induced CaMKIIδ and CaMKIIγ Confer Neuroprotection Through the NF-κB Signaling Pathway. Mol Neurobiol 2018; 56:2123-2136. [PMID: 29992531 PMCID: PMC6394630 DOI: 10.1007/s12035-018-1198-2] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/05/2018] [Accepted: 06/26/2018] [Indexed: 12/13/2022]
Abstract
Ca2+/calmodulin-dependent protein kinase II (CaMKII) has long been implicated in neuronal injury caused by acute ischemia/reperfusion (I/R). However, its precise role and regulatory mechanisms remain obscure. Here, we investigated the role of the CaMKII family in neuronal survival during I/R. Our data indicated that CAMK2D/CaMKIIδ and CAMK2G/CaMKIIγ were selectively upregulated in a time-dependent manner at both transcriptional and protein levels after acute ischemia. Overexpression of CaMKIIδ promoted neuronal survival, while their depletion exacerbated ischemic neuronal death. Similar to CaMKIIδ, knockdown of CAMKIIγ resulted in significant neuronal death after I/R. We further identified CaMKIIδ2 as the subtype that is selectively induced by I/R in primary neurons. The induction of CaMKIIδ was controlled in part by a pair of long non-coding RNAs (lncRNAs), C2dat1 and C2dat2. C2dat2, similar to C2dat1, was upregulated by I/R and cooperated with C2dat1 to modulate CaMKIIδ expression. Knockdown of C2dat1/2 blocked OGD/R-induced CaMKIIδ expression and decreased neuronal survival but did not affect the levels of CaMKIIγ, indicating specific targeting of CAMK2D by C2dat1/2. Mechanistically, I/R-induced CaMKIIδ and CaMKIIγ caused the upregulation of IKKα/β and further activation of the NF-κB signaling pathway to protect neurons from ischemic damage. Genetically, downregulating p65 subunit of NF-κB in mice increased I/R-induced neuronal death by blocking the activity of CaMKII/IKK/IκBα/NF-κB signaling axis. In summary, CaMKIIδ and CaMKIIγ are novel I/R-induced genes that promote neuronal survival during ischemic injury. The upregulation of these CaMKII kinases led to activation of the NF-κB signaling pathway, which protects neurons from ischemic damage.
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Affiliation(s)
- Jing Ye
- Department of Pharmacology and Chemical Biology, University of Pittsburgh School of Medicine, E1354 BST, Pittsburgh, PA, 15261, USA.,Department of Anesthesiology, Nanfang Hospital, Southern Medical University, Guangzhou, People's Republic of China
| | - Sabyasachi Das
- Department of Pharmacology and Chemical Biology, University of Pittsburgh School of Medicine, E1354 BST, Pittsburgh, PA, 15261, USA
| | - Adhiraj Roy
- Department of Pharmacology and Chemical Biology, University of Pittsburgh School of Medicine, E1354 BST, Pittsburgh, PA, 15261, USA
| | - Wenzhong Wei
- Department of Orthopaedic Surgery, University of Pittsburgh, Pittsburgh, PA, USA
| | - Huachen Huang
- Department of Neurology, University of Pittsburgh, Pittsburgh, PA, USA.,Department of Neurology, The First affiliate Hospital, Harbin Medical University, Harbin, Heilongjiang, China
| | - Joshua Michael Lorenz-Guertin
- Department of Pharmacology and Chemical Biology, University of Pittsburgh School of Medicine, E1354 BST, Pittsburgh, PA, 15261, USA
| | - Qian Xu
- China-UK-NYNU-RRes Joint Laboratory, Nanyang Normal University, Nanyang, People's Republic of China
| | - Tija C Jacob
- Department of Pharmacology and Chemical Biology, University of Pittsburgh School of Medicine, E1354 BST, Pittsburgh, PA, 15261, USA
| | - Bing Wang
- Department of Orthopaedic Surgery, University of Pittsburgh, Pittsburgh, PA, USA
| | - Dandan Sun
- Department of Neurology, University of Pittsburgh, Pittsburgh, PA, USA
| | - Qiming Jane Wang
- Department of Pharmacology and Chemical Biology, University of Pittsburgh School of Medicine, E1354 BST, Pittsburgh, PA, 15261, USA.
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12
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Jia Z, Dong A, Che H, Zhang Y. 17-DMAG Protects Against Hypoxia-/Reoxygenation-Induced Cell Injury in HT22 Cells Through Akt/Nrf2/HO-1 Pathway. DNA Cell Biol 2017; 36:95-102. [PMID: 27982695 DOI: 10.1089/dna.2016.3445] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Affiliation(s)
- Zhuopeng Jia
- Department of Neurosurgery, The First Affiliated hospital of Xi'an Medical University, Xi'an, China
| | - Arui Dong
- Department of Neurosurgery, Shaanxi Second Provincial People's Hospital, Xi'an, China
| | - Hongmin Che
- Department of Neurosurgery, The First Affiliated hospital of Xi'an Medical University, Xi'an, China
| | - Yu Zhang
- Department of Neurosurgery, No. 215 Hospital of Shaanxi Nuclear Industry, Xianyang, China
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13
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Choi H, Kim SH, Chun YS, Cho YS, Park JW, Kim MS. In Vivo Hyperoxic Preconditioning Prevents Myocardial Infarction by Expressing Bcl-2. Exp Biol Med (Maywood) 2016; 231:463-72. [PMID: 16565442 DOI: 10.1177/153537020623100412] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Preconditioning with oxidative stress has been demonstrated in vitro to stimulate the cellular adaptation to subsequent severe oxidative stress. However, it is uncertain whether this preconditioning works in vivo. In the present study, we examined in vivo the beneficial effect of oxidative preconditioning. After rats were pretreated with whole-body hyperoxygenation (100% 02 at 3 atmosphere for 20 mins, four cycles with 20-min intermission), isolated hearts were subjected to 45-min ischemia followed by 90-min reperfusion. This hyperoxic preconditioning significantly reduced infarct size, cytochrome-c release, DNA fragmentation, and terminal deoxynucleotidyl transferase-mediated dUTD nick-end labeling-positive cell frequency in the left ventricle, biphasically with an early (30-min) and a delayed (48-hr) effect after the hyperoxygenation. Mechanistically, the NF-κB activity and Bcl-2 expression were enhanced in the hearts, and a NF-κB inhibitor, pyrrolidine dithiocarbamate, abolished the Bcl-2 induction as well as the infarct-limiting effect. An antioxidant, N-acetylcysteine, and protein kinase C (PKC) inhibitors chelerythrine and Gö 6983 also blocked the preconditioning effects. These results indicate that hyperoxia induces myocardial tolerance against ischemia-reperfusion injury in association with Bcl-2 induction by NF-κB activation through reactive oxygen species and PKC-dependent signaling pathway.
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Affiliation(s)
- Hong Choi
- Department of Pharmacology, Seoul National University College of Medicine and Heart Research Institute SNUMRC, 28 Yongon-dong, Chongno-gu, Seoul 110-799, Korea
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14
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You W, Zuo G, Shen H, Tian X, Li H, Zhu H, Yin J, Zhang T, Wang Z. Potential dual role of nuclear factor-kappa B in experimental subarachnoid hemorrhage-induced early brain injury in rabbits. Inflamm Res 2016; 65:975-984. [PMID: 27554683 DOI: 10.1007/s00011-016-0980-8] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2016] [Revised: 07/18/2016] [Accepted: 08/11/2016] [Indexed: 12/17/2022] Open
Abstract
OBJECTIVE AND DESIGN Nuclear factor-kappa B (NF-κB) has multiple physiological and pathological functions. The role of NF-κB can be protective or destructive. We aim to investigate the biphasic activation of NF-κB in brain after subarachnoid hemorrhage (SAH). MATERIAL OR SUBJECTS Eighty male New Zealand rabbits are assigned to control, SAH, vehicle, and pyrrolidine dithiocarbamate (PDTC) groups. TREATMENT PDTC (3 mg/kg, dissolved in saline) was injected into cisterna magna. METHODS Immunofluorescence and electrophoretic mobility shift assay experiments were performed to assess the activation of NF-κB. The levels of inflammatory and apoptosis mediators were detected by ELISA and real-time polymerase chain reaction. Nissl and immunofluorescent stain was performed to evaluate neuron injury. RESULTS NF-κB activity in the brain cortex showed two peaks after SAH. Inflammatory mediators exhibited similar time course. PDTC could significantly inhibit the NF-κB activity and inflammatory mediators. Suppressing the early NF-κB activity significantly decreased neuron injury, while inhibiting the late one could statistically increase neuron injury. CONCLUSIONS The biphasic NF-κB activation in the brain cortex after SAH played a decisive role on neuronal fate through the inflammatory signaling pathway. The early NF-κB activity contributed to neuron damage after SAH. Nevertheless, the late activated NF-κB may serve as a protector.
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Affiliation(s)
- Wanchun You
- Department of Neurosurgery and Brain and Nerve Research Laboratory, The First Affiliated Hospital of Soochow University, 188 Shizi Street, Suzhou, 215006, China
| | - Gang Zuo
- Department of Neurosurgery and Brain and Nerve Research Laboratory, The First Affiliated Hospital of Soochow University, 188 Shizi Street, Suzhou, 215006, China.,Department of Neurosurgery, The First People's Hospital of Taicang City, Taicang, 215400, China
| | - Haitao Shen
- Department of Neurosurgery and Brain and Nerve Research Laboratory, The First Affiliated Hospital of Soochow University, 188 Shizi Street, Suzhou, 215006, China
| | - Xiaodi Tian
- Department of Neurosurgery and Brain and Nerve Research Laboratory, The First Affiliated Hospital of Soochow University, 188 Shizi Street, Suzhou, 215006, China
| | - Haiying Li
- Department of Neurosurgery and Brain and Nerve Research Laboratory, The First Affiliated Hospital of Soochow University, 188 Shizi Street, Suzhou, 215006, China
| | - Haiping Zhu
- Department of Neurosurgery, Changshu No. 1 People's Hospital, Changshu, 215500, China.
| | - Jun Yin
- Department of Neurosurgery, Taixing Chinese Medicine Hospital, Taixing, 225400, China.
| | - Tiejun Zhang
- Department of Neurosurgery and Brain and Nerve Research Laboratory, The First Affiliated Hospital of Soochow University, 188 Shizi Street, Suzhou, 215006, China
| | - Zhong Wang
- Department of Neurosurgery and Brain and Nerve Research Laboratory, The First Affiliated Hospital of Soochow University, 188 Shizi Street, Suzhou, 215006, China
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15
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Abstract
Alzheimer's disease (AD) is a fatal neurodegenerative disorder that has no known cure, nor is there a clear mechanistic understanding of the disease process itself. Although amyloid plaques, neurofibrillary tangles, and cognitive decline are late-stage markers of the disease, it is unclear how they are initially generated, and if they represent a cause, effect, or end phase in the pathology process. Recent studies in AD models have identified marked dysregulations in calcium signaling and related downstream pathways, which occur long before the diagnostic histopathological or cognitive changes. Under normal conditions, intracellular calcium signals are coupled to effectors that maintain a healthy physiological state. Consequently, sustained up-regulation of calcium may have pathophysiological consequences. Indeed, upon reviewing the current body of literature, increased calcium levels are functionally linked to the major features and risk factors of AD: ApoE4 expression, presenilin and APP mutations, beta amyloid plaques, hyperphosphorylation of tau, apoptosis, and synaptic dysfunction. In turn, the histopathological features of AD, once formed, are capable of further increasing calcium levels, leading to a rapid feed-forward acceleration once the disease process has taken hold. The views proposed here consider that AD pathogenesis reflects long-term calcium dysregulations that ultimately serve an enabling role in the disease process. Therefore, “Calcinists” do not necessarily reject βAptist or Tauist doctrine, but rather believe that their genesis is associated with earlier calcium signaling dysregulations. NEUROSCIENTIST 13(5):546—559, 2007.
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Affiliation(s)
- Grace E Stutzmann
- Rosalind Franklin University of Medicine and Science, The Chicago Medical School, North Chicago, IL 60064, USA.
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16
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Kim J, Fann DY, Seet RC, Jo DG, Mattson MP, Arumugam TV. Phytochemicals in Ischemic Stroke. Neuromolecular Med. 2016;18:283-305. [PMID: 27193940 DOI: 10.1007/s12017-016-8403-0] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2016] [Accepted: 05/09/2016] [Indexed: 12/24/2022]
Abstract
Stroke is the second foremost cause of mortality worldwide and a major cause of long-term disability. Due to changes in lifestyle and an aging population, the incidence of stroke continues to increase and stroke mortality predicted to exceed 12 % by the year 2030. However, the development of pharmacological treatments for stroke has failed to progress much in over 20 years since the introduction of the thrombolytic drug, recombinant tissue plasminogen activator. These alarming circumstances caused many research groups to search for alternative treatments in the form of neuroprotectants. Here, we consider the potential use of phytochemicals in the treatment of stroke. Their historical use in traditional medicine and their excellent safety profile make phytochemicals attractive for the development of therapeutics in human diseases. Emerging findings suggest that some phytochemicals have the ability to target multiple pathophysiological processes involved in stroke including oxidative stress, inflammation and apoptotic cell death. Furthermore, epidemiological studies suggest that the consumption of plant sources rich in phytochemicals may reduce stroke risk, and so reinforce the possibility of developing preventative or neuroprotectant therapies for stroke. In this review, we describe results of preclinical studies that demonstrate beneficial effects of phytochemicals in experimental models relevant to stroke pathogenesis, and we consider their possible mechanisms of action.
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17
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Zhao T, Tang X, Umeshappa CS, Ma H, Gao H, Deng Y, Freywald A, Xiang J. Simulated Microgravity Promotes Cell Apoptosis Through Suppressing Uev1A/TICAM/TRAF/NF-κB-Regulated Anti-Apoptosis and p53/PCNA- and ATM/ATR-Chk1/2-Controlled DNA-Damage Response Pathways. J Cell Biochem 2016; 117:2138-48. [PMID: 26887372 DOI: 10.1002/jcb.25520] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2015] [Accepted: 02/12/2016] [Indexed: 11/11/2022]
Abstract
Microgravity has been known to induce cell death. However, its underlying mechanism is less studied. In this study, BL6-10 melanoma cells were cultured in flasks under simulated microgravity (SMG). We examined cell apoptosis, and assessed expression of genes associated with apoptosis and genes regulating apoptosis in cells under SMG. We demonstrate that SMG induces cell morphological changes and microtubule alterations by confocal microscopy, and enhances apoptosis by flow cytometry, which was associated with up- and down-regulation of pro-apoptotic and anti-apoptotic genes, respectively. Moreover, up- and down-regulation of pro-apoptotic (Caspases 3, 7, 8) and anti-apoptotic (Bcl2 and Bnip3) molecules was confirmed by Western blotting analysis. Western blot analysis also indicates that SMG causes inhibition of an apoptosis suppressor, pNF-κB-p65, which is complemented by the predominant localization of NF-κB-p65 in the cytoplasm. SMG also reduces expression of molecules regulating the NF-κB pathway including Uev1A, TICAM, TRAF2, and TRAF6. Interestingly, 10 DNA repair genes are down-regulated in cells exposed to SMG, among which down-regulation of Parp, Ercc8, Rad23, Rad51, and Ku70 was confirmed by Western blotting analysis. In addition, we demonstrate a significant inhibition of molecules involved in the DNA-damage response, such as p53, PCNA, ATM/ATR, and Chk1/2. Taken together, our work reveals that SMG promotes the apoptotic response through a combined modulation of the Uev1A/TICAM/TRAF/NF-κB-regulated apoptosis and the p53/PCNA- and ATM/ATR-Chk1/2-controlled DNA-damage response pathways. Thus, our investigation provides novel information, which may help us to determine the cause of negative alterations in human physiology occurring at spaceflight environment. J. Cell. Biochem. 117: 2138-2148, 2016. © 2016 Wiley Periodicals, Inc.
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Affiliation(s)
- Tuo Zhao
- Aerospace Institute of Medical Engineering and Biotechnology, School of Life Sciences, Beijing Institute of Technology, Beijing, China
| | - Xin Tang
- Aerospace Institute of Medical Engineering and Biotechnology, School of Life Sciences, Beijing Institute of Technology, Beijing, China
| | | | - Hong Ma
- Aerospace Institute of Medical Engineering and Biotechnology, School of Life Sciences, Beijing Institute of Technology, Beijing, China
| | - Haijun Gao
- Aerospace Institute of Medical Engineering and Biotechnology, School of Life Sciences, Beijing Institute of Technology, Beijing, China
| | - Yulin Deng
- Aerospace Institute of Medical Engineering and Biotechnology, School of Life Sciences, Beijing Institute of Technology, Beijing, China
| | - Andrew Freywald
- Department of Pathology, College of Medicine, University of Saskatchewan, Saskatoon, Saskatchewan, Canada
| | - Jim Xiang
- Aerospace Institute of Medical Engineering and Biotechnology, School of Life Sciences, Beijing Institute of Technology, Beijing, China.,Cancer Research Cluster, Saskatchewan Cancer Agency, Saskatoon, Saskatchewan, Canada
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18
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Zhuang Z, Sun XJ, Zhang X, Liu HD, You WC, Ma CY, Zhu L, Zhou ML, Shi JX. Nuclear factor-κB/Bcl-XL pathway is involved in the protective effect of hydrogen-rich saline on the brain following experimental subarachnoid hemorrhage in rabbits. J Neurosci Res 2013; 91:1599-608. [PMID: 24105634 DOI: 10.1002/jnr.23281] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2013] [Revised: 05/22/2013] [Accepted: 06/26/2013] [Indexed: 01/01/2023]
Abstract
Early brain injury (EBI), a significant contributor to poor outcome after subarachnoid hemorrhage (SAH), is intimately associated with neuronal apoptosis. Recently, the protective role of hydrogen (H2 ) in the brain has been widely studied, but the underlying mechanism remains elusive. Numerous studies have shown nuclear factor-κB (NF-κB) as a crucial survival pathway in neurons. Here we investigated the role of H2 in EBI following SAH, focusing on the NF-κB pathway. A double blood injection model was used to produce experimental SAH, and H2 -rich saline was injected intraperitoneally. NF-κB activity within the occipital cortex was measured. Immunofluorescence was performed to demonstrate the activation of NF-κB; Bcl-xL and cleaved caspase-3 were determined via Western blot. Gene expression of Bcl-xL was detected by real-time PCR, and TUNEL and Nissl staining were performed to illustrate brain injury in the occipital cortex. SAH induced a significant increase of cleaved caspase-3. Correspondingly, TUNEL staining demonstrated obvious neuronal apoptosis following SAH. In contrast, H2 treatment markedly increased NF-κB activity and the expression of Bcl-xL and decreased the level of cleaved caspase-3. Additionally, H2 treatment significantly reduced post-SAH neuronal apoptosis. The current study shows that H2 treatment alleviates EBI in the rabbits following SAH and that NF-κB/Bcl-xL pathway is involved in the protective role of H2 .
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Affiliation(s)
- Zong Zhuang
- Department of Neurosurgery, Jinling Hospital, School of Medicine, Nanjing University, Nanjing, Jiangsu, People's Republic of China
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19
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Fann DYW, Lee SY, Manzanero S, Chunduri P, Sobey CG, Arumugam TV. Pathogenesis of acute stroke and the role of inflammasomes. Ageing Res Rev 2013; 12:941-66. [PMID: 24103368 DOI: 10.1016/j.arr.2013.09.004] [Citation(s) in RCA: 239] [Impact Index Per Article: 21.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2013] [Revised: 09/12/2013] [Accepted: 09/19/2013] [Indexed: 12/20/2022]
Abstract
Inflammation is an innate immune response to infection or tissue damage that is designed to limit harm to the host, but contributes significantly to ischemic brain injury following stroke. The inflammatory response is initiated by the detection of acute damage via extracellular and intracellular pattern recognition receptors, which respond to conserved microbial structures, termed pathogen-associated molecular patterns or host-derived danger signals termed damage-associated molecular patterns. Multi-protein complexes known as inflammasomes (e.g. containing NLRP1, NLRP2, NLRP3, NLRP6, NLRP7, NLRP12, NLRC4, AIM2 and/or Pyrin), then process these signals to trigger an effector response. Briefly, signaling through NLRP1 and NLRP3 inflammasomes produces cleaved caspase-1, which cleaves both pro-IL-1β and pro-IL-18 into their biologically active mature pro-inflammatory cytokines that are released into the extracellular environment. This review will describe the molecular structure, cellular signaling pathways and current evidence for inflammasome activation following cerebral ischemia, and the potential for future treatments for stroke that may involve targeting inflammasome formation or its products in the ischemic brain.
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20
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Abstract
Intracerebral hemorrhage (ICH) remains a major medical problem, for which there is no effective treatment. However, extensive experimental and clinical research carried out in recent years has brought to light new exciting ideas for novel potential treatments. First, it was well documented that the management of hypertension helps to prevent new and recurrent ICH. Also, development of new guidelines for management of hypertension after the onset of the ICH may help in more effective ICH treatment. Existing contemporary data collected from preclinical studies indicates that ICH-induced inflammation represents a key factor leading to secondary brain damage, suggesting that some anti-inflammatory approaches can be used to treat hemorrhagic stroke. In this article, beyond discussing implications related to hypertension, we will summarize important (but not all) new discoveries connecting the role of inflammation to ICH pathology. Selected aspects of inflammatory response including the role of cytokines, transcription factor nuclear factor-kB, microglia activation, astrogliosis, and complement activation will be introduced. We will also discuss the role for reactive oxygen species and metalloproteinases in ICH pathogenesis and introduce basic knowledge on the nature of ICH-induced cell death including apoptosis. Potential targets for intervention and translation will be discussed.
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Affiliation(s)
- Jaroslaw Aronowski
- Stroke Program, Department of Neurology, University of Texas-Houston Medical School, Houston, TX 77030, USA.
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21
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Gorbacheva L, Strukova S, Pinelis V, Ishiwata S, Stricker R, Reiser G. NF-κB-dependent and -independent pathways in the protective effects of activated protein C in hippocampal and cortical neurons at excitotoxicity. Neurochem Int 2013; 63:101-11. [PMID: 23727063 DOI: 10.1016/j.neuint.2013.05.008] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2012] [Revised: 05/17/2013] [Accepted: 05/19/2013] [Indexed: 12/21/2022]
Abstract
The transcription factor NF-κB regulates the expression of multiple genes involved in inflammation, apoptotic cell death and cell survival. We previously demonstrated that activated protein C (APC), a serine protease of hemostasis with anticoagulant activity, protected cultured rat cortical and hippocampal neurons against glutamate-induced excitotoxicity, a model of ischemic stroke. We reported that APC suppressed the translocation of NF-κBp65/RelA into the nucleus of neurons. However, it is not known whether APC-induced protection of neurons against cell death occurs via regulation of NF-κB activation or NF-κB-independent p53 expression. It is also unclear whether cleaved caspase-3 and caspase-independent AIF and Bax/Bcl-2 expression are involved at excitotoxicity. To elucidate the NF-κB dependent and -independent mechanisms in the APC-mediated cell survival, we analyzed in cortical and hippocampal neurons the effects of helenalin, a specific inhibitor of NF-κB activity, and APC on neuronal cell death and on the level of nuclear AIF, p53, caspase-3 and the apoptotic index (Bax/Bcl-2 ratio). We could demonstrate that helenalin (5 μM), like APC (1 nM), protects cultured neurons from glutamate-induced excitotoxicity. Both APC and helenalin inhibit AIF release from mitochondria and its translocation into the nucleus. They decrease the apoptotic index in neurons at excitotoxicity. However, APC, but not helenalin, reduced the glutamate-induced activation of caspase-3. Incubation of neurons with APC blocked the glutamate-induced increase in the nuclear level of p53 via NF-κB-independent pathway. Our findings demonstrate that, in the protective effect of APC in neurons at excitotoxicity, the NF-κB pathway is an important, but not the only pathway, and is significantly connected with neuronal survival at excitotoxicity.
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Affiliation(s)
- Lubov Gorbacheva
- Lomonosov Moscow State University, Department of Human & Animal Physiology, 119991 Moscow, Russia
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22
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Chen M, Sun HY, Hu P, Wang CF, Li BX, Li SJ, Li JJ, Tan HY, Gao TM. Activation of BKCa Channels Mediates Hippocampal Neuronal Death After Reoxygenation and Reperfusion. Mol Neurobiol 2013; 48:794-807. [DOI: 10.1007/s12035-013-8467-x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2013] [Accepted: 04/26/2013] [Indexed: 11/29/2022]
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23
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Ibuki T, Yamasaki Y, Mizuguchi H, Sokabe M. Protective effects of XBP1 against oxygen and glucose deprivation/reoxygenation injury in rat primary hippocampal neurons. Neurosci Lett 2012; 518:45-8. [PMID: 22580202 DOI: 10.1016/j.neulet.2012.04.053] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2012] [Revised: 04/17/2012] [Accepted: 04/25/2012] [Indexed: 11/19/2022]
Abstract
The accumulation of misfolded and unfolded proteins in the endoplasmic reticulum (ER) induces ER stress, activating the unfolded protein response (UPR). One of the effectors of the UPR is XBP1, a critical transcriptional factor for genes responsible for cell survival. ER stress is also known to play a vital role in mediating ischemic reperfusion damage in the brain. In this study, we investigated the role of XBP1 in rat primary hippocampal neurons subjected to oxygen and glucose deprivation followed by reoxygenation (OGD/R) stress, an in vitro model of ischemia/reperfusion (I/R) injury. Primary neurons subjected to OGD had increased levels of spliced XBP1 (XBP1s) mRNA. Interestingly, the level of XBP1s decreased during the initial reoxygenation stress period. The combination of OGD and the subsequent 20-h reoxygenation stress period significantly increased the apoptotic death of primary cells. Overexpression of XBP1s suppressed cell death induced by OGD/R stress. These results suggest that suppression of XBP1 activation accelerates neuronal cell death after I/R and that activation of the XBP1 pathway may provide a therapeutic approach for the treatment of cerebral I/R injury.
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Affiliation(s)
- Tatsuki Ibuki
- Qs' Research Institute, Otsuka Pharmaceutical Co. Ltd., 463-10 Kagasuno, Kawauchi, Tokushima 771-0192, Japan
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24
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Widiapradja A, Vegh V, Lok KZ, Manzanero S, Thundyil J, Gelderblom M, Cheng YL, Pavlovski D, Tang SC, Jo DG, Magnus T, Chan SL, Sobey CG, Reutens D, Basta M, Mattson MP, Arumugam TV. Intravenous immunoglobulin protects neurons against amyloid beta-peptide toxicity and ischemic stroke by attenuating multiple cell death pathways. J Neurochem 2012; 122:321-32. [PMID: 22494053 DOI: 10.1111/j.1471-4159.2012.07754.x] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Intravenous immunoglobulin (IVIg) preparations obtained by fractionating blood plasma, are increasingly being used increasingly as an effective therapeutic agent in treatment of several inflammatory diseases. Its use as a potential therapeutic agent for treatment of stroke and Alzheimer's disease has been proposed, but little is known about the neuroprotective mechanisms of IVIg. In this study, we investigated the effect of IVIg on downstream signaling pathways that are involved in neuronal cell death in experimental models of stroke and Alzheimer's disease. Treatment of cultured neurons with IVIg reduced simulated ischemia- and amyloid βpeptide (Aβ)-induced caspase 3 cleavage, and phosphorylation of the cell death-associated kinases p38MAPK, c-Jun NH2 -terminal kinase and p65, in vitro. Additionally, Aβ-induced accumulation of the lipid peroxidation product 4-hydroxynonenal was attenuated in neurons treated with IVIg. IVIg treatment also up-regulated the anti-apoptotic protein, Bcl2 in cortical neurons under ischemia-like conditions and exposure to Aβ. Treatment of mice with IVIg reduced neuronal cell loss, apoptosis and infarct size, and improved functional outcome in a model of focal ischemic stroke. Together, these results indicate that IVIg acts directly on neurons to protect them against ischemic stroke and Aβ-induced neuronal apoptosis by inhibiting cell death pathways and by elevating levels of the anti-apoptotic protein Bcl2.
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Affiliation(s)
- Alexander Widiapradja
- School of Biomedical Sciences, The University of Queensland, St Lucia, Queensland, Australia
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25
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Xu Y. Potential Therapeutic Targets for Cerebral Resuscitation After Global Ischemia. Transl Stroke Res 2012. [DOI: 10.1007/978-1-4419-9530-8_22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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26
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Kwon SH, Hong SI, Jung YH, Kim MJ, Kim SY, Kim HC, Lee SY, Jang CG. Lonicera japonica THUNB. protects 6-hydroxydopamine-induced neurotoxicity by inhibiting activation of MAPKs, PI3K/Akt, and NF-κB in SH-SY5Y cells. Food Chem Toxicol 2011; 50:797-807. [PMID: 22227216 DOI: 10.1016/j.fct.2011.12.026] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2011] [Revised: 11/30/2011] [Accepted: 12/15/2011] [Indexed: 11/30/2022]
Abstract
In this study, we investigated the neuroprotective effects of Lonicera japonica THUNB. extract (LJ) on 6-hydroxydopamine (6-OHDA)-induced neurotoxicity in SH-SY5Y cells. We found that LJ significantly increased cell viability decrease, lactate dehydrogenase release (LDH), morphological changes, nuclear condensation, fragmentation, and reactive oxygen species (ROS) production induced by 6-OHDA in SH-SY5Y cells. The cytoprotection afforded by pretreatment with LJ was associated with increases of the glutathione (GSH) level, superoxide dismutase (SOD) activity, and catalase (CAT) activity in 6-OHDA-induced SH-SY5Y cells. In addition, LJ strikingly inhibited 6-OHDA-induced mitochondrial dysfunctions including reduction of mitochondria membrane potential (MMP) and activation of cleaved poly-ADP-ribose polymerase (PARP), cleaved caspase-3, cleaved caspase-9, increased Bax, as well as decreased Bcl-2 and Bcl-xL. Additionally, LJ dramatically attenuated 6-OHDA-induced phosphorylation of c-Jun N-terminal kinase (JNK), p38 mitogen-activated protein kinase (MAPK), extracellular signal-regulated kinase 1/2 (ERK 1/2), and phosphoinositide 3-kinase (PI3K)/Akt. Meanwhile, LJ counteracted nuclear factor-κB (NF-κB) activation by blocking its translocation to the nucleus. These findings suggest that LJ has a potent anti-parkinsonism; this effect was mediated, at least in part, by inhibition of neurotoxicity, apoptotic cascade events, and oxidative stress via activation of MAPKs, PI3K/Akt, and NF-κB.
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Affiliation(s)
- Seung-Hwan Kwon
- Department of Pharmacology, School of Pharmacy, Sungkyunkwan University, Suwon 440-746, Republic of Korea
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Abstract
Rhinacanthus nasutus (L.) Kurz (Acanthaceae) is an herb native to Thailand and Southeast Asia, known for its antioxidant properties. Hypoxia leads to an increase in reactive oxygen species in cells and is a leading cause of neuronal damage. Cell death caused by hypoxia has been linked with a number of neurodegenerative diseases including some forms of dementia and stroke, as well as the build up of reactive oxygen species which can lead to diseases such as Huntington's disease, Parkinson's disease and Alzeheimer's disease. In this study we used an airtight culture container and the Mitsubishi Gas Company anaeropack along with the MTT assay, LDH assay and the trypan blue exlusion assay to show that 1 and 10 µg mL⁻¹ root extract of R. nasutus is able to significantly prevent the death of HT-22 cells subjected to hypoxic conditions, and 0.1 to 10 µg mL⁻¹ had no toxic effect on HT-22 under normal conditions, whereas 100 µg mL⁻¹ reduced HT-22 cell proliferation. We also used H₂DCFDA staining to show R. nasutus can reduce reactive oxygen species production in HT-22 cells.
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Affiliation(s)
| | - Tewin Tencomnao
- Author to whom correspondence should be addressed; ; Tel.: +66-2218-1081 ext. 313; Fax: +66-2-218-1082
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Wang SM, Zheng SJ, Xing XY, Deng ZH, Liu M, Yu H, Li CY, Duan ZP. YImpact of exogenous TGF-β1 on cell cycle progression and apoptosis in rat liver cell line BRL-3A. Shijie Huaren Xiaohua Zazhi 2011; 19:1659-1665. [DOI: 10.11569/wcjd.v19.i16.1659] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM: To explore whether exogenous transforming growth factor-beta 1 (TGF-β1) affects rat liver cell line BRL-3A in terms of cell cycle progression and apoptosis.
METHODS: (1) BRL-3A cells were divided into six groups and exposed to different concentrations of TGF-β1 (0, 2, 4, 6, 8, 10 μg/L), and cell proliferation was detected by MTT assay at 24, 36 and 48 h after treatment. (2) After BRL-3A cells were treated with TGF-β1 (8 μg/L) for 24, 36 or 48 h, flow cytometry was performed to measure cell cycle progression and apoptosis and real-time quantitative RT-PCR was used to quantify the mRNA expression of Cyclin E, Cdk-2, EGF, HGF, Bcl-2, c-Myc, MMP9, and NF-κB genes.
RESULTS: (1) There was no statistical difference in cell proliferation among cells treated with six different concentrations of TGF-β1 for 24, 36 or 48 h (all P > 0.05). (2) Cell cycle progression and apoptosis rate also showed no statistical difference between cells treated with 8 μg/L TGF-β1 and control cells at 24, 36 and 48 h (all P > 0.05). Compared to control cells, the mRNA expression of Cyclin E, Cdk-2, and EGF in cells treated with 8 μg/L TGF-β1 significantly decreased at 24 and 36 h but significantly increased at 48 h (all P < 0.05); that of HGF significantly declined at all three time points (all P < 0.05); that of Bcl-2 showed no significant changes at 24 and 36 h but increased at 48 h; and that of c-Myc, MMP9 and NF-κB was up-regulated at all three time points (all P < 0.05).
CONCLUSION: The insensitivity of BRL-3A cells to TGF-β1-induced apoptosis and cell cycle arrest may be related to activation of non-SMAD pathway and up-regulation of NF-κB, Bcl-2, c-Myc, and MMP9 expression.
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29
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Mammen A, Kubin J, Greeley WJ, Schears GJ, Pastuszko P, F Wilson D, Pastuszko A. Effect of hypoxia on expression of selected proteins involved in regulation of apoptotic activity in striatum of newborn piglets. Neurochem Res 2011; 36:746-53. [PMID: 21229310 PMCID: PMC3071469 DOI: 10.1007/s11064-010-0394-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/29/2010] [Indexed: 12/25/2022]
Abstract
The levels of selected neuroregulatory proteins that inhibit or promote apoptotic cell death were measured in the striatum of piglets subjected to precisely controlled 1 h hypoxic insult followed by 0, 2 and 4 h recovery and compared to sham operated animals. The anti-apoptotic proteins: there were increases in Survivin at 0 (157%, P = 0.031) and 4 h (171%, P = 0.033), in Bcl-XL at 0 (138%, P = 0.028) and 4 h (143%, P = 0.007), in VEGF at 4 h (185%, P = 0.019) and Hsp27 at 2 h (144%, P = 0.05) and 4 h (143%, P = 0.05). The pro-apoptotic proteins: caspases-1 and 7 increased at 4 h (135%, P = 0.05) and (129%, P = 0.038), respectively. Bim increased after 4 h (115%, P = 0.028), Apoptosis Inducing Factor after 2 h (127%, P = 0.048) and Calpain after 4 h (143% of control, P = 0.04). Hypoxia causes increase in levels of both anti- and pro-apoptotic proteins. Their relative activity determines the outcome in terms of cell damage and neuronal deficit.
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Affiliation(s)
- A Mammen
- Department of Anesthesiology and Critical Care Medicine, Children's Hospital of Philadelphia, University of Pennsylvania, Philadelphia, USA
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30
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Xie CY, Yang W, Ying J, Ni QC, Pan XD, Dong JH, Li K, Wang XS. B-Cell Lymphoma-2 Over-Expression Protects .DELTA.-Elemene-Induced Apoptosis in Human Lung Carcinoma Mucoepidermoid Cells via a Nuclear Factor Kappa B-Related Pathway. Biol Pharm Bull 2011; 34:1279-86. [DOI: 10.1248/bpb.34.1279] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Chun Ying Xie
- The Sixth Affiliated Hospital, Sun Yat-Sen University
| | - Wei Yang
- Center for Drug Non-clinical Research and Evaluation of Pharmaceutical Industrial Research Institute in Guangzhou
| | - Jun Ying
- Center for Drug Non-clinical Research and Evaluation of Pharmaceutical Industrial Research Institute in Guangzhou
| | - Qing Chun Ni
- Center for Drug Non-clinical Research and Evaluation of Pharmaceutical Industrial Research Institute in Guangzhou
| | - Xue Diao Pan
- College of Pharmacy, GuangDong Pharmaceutical University
| | - Jin Hua Dong
- Department of Chemical Pharmaceutics, Shenyang Pharmaceutical University
| | - Karen Li
- Prince of Wales Hospital, Chinese University of Hong Kong
| | - Xi Sha Wang
- College of Pharmacy, GuangDong Pharmaceutical University
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Abstract
Growing evidence has demonstrated that, as an endogenous signaling gasotransmitter, hydrogen sulfide (H(2)S) plays an important role in regulating numerous biological functions. The role of H(2)S in hypoxia-induced radioresistance on hepatoma cells was investigated in the present work. Results showed that, when HepG2 cells were maintained in hypoxia circumstances for 4 h, the cellular radioresistance was extensively increased so that the oxygen enhancement ratio of the survival fraction approached 2.68. Under this hypoxic condition, when the cells were treated with DL-propargylglycine (PPG) and aminooxyacetic acid (AOAA), a specific inhibitor of H(2)S synthase of cystathionine-γ-lyase (CSE) and cystathionine-β-synthase (CBS) respectively, radiation responses including cell killing, micronuclei (MN) formation, and caspase-3 activity were significantly enhanced. However, treatment of cells with low concentrations of NaHS (≤ 100 µM) protected cells from these radiation damages. Western bolting assay showed that CSE and CBS were over-expressed in the irradiated hypoxic cells in a dose dependent manner. Moreover, when the hypoxic HepG2 cells were treated with NaHS together with glibenclamide, a specific inhibitor of K(+)(ATP) channels, the role of exogenous H(2)S in radioprotection was partly eliminated. This study demonstrated that H(2)S contributed to hypoxia-induced radioresistance probably via the opening of K(+)(ATP) channels, which suggests that the endogenous H(2)S synthase could be a potential radiotherapeutic target for a hypoxic tumor.
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Affiliation(s)
- Jianghong Zhang
- Institute of Radiation Medicine, Fudan University, Shanghai, China
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32
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Shimada S, Hirabayashi M, Ishige K, Kosuge Y, Kihara T, Ito Y. Activation of dopamine D4 receptors is protective against hypoxia/reoxygenation-induced cell death in HT22 cells. J Pharmacol Sci 2010; 114:217-24. [PMID: 20921819 DOI: 10.1254/jphs.10134fp] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
Abstract
Several reports have shown that some dopamine receptor ligands modulate the ischemia-reperfusion injury in animal models; however, its underling mechanisms are still unclear. In this study, we sought to establish an in vitro experimental model of hypoxia/reoxygenation (H/R) using HT22 cells that originated from mouse hippocampal neurons and to examine protective the effect of dopamine-receptor ligands against H/R-induced cell injury. The treatment with hypoxia for 18 h followed by reoxygenation for 6 h induced the elevation of intracellular reactive oxygen species (ROS) and reduction of mitochondrial membrane potential; however, lactate dehydrogenase (LDH) release was not changed at this time point. LDH release was increased after reoxygenation for 18 h and longer, and this increase in LDH release was suppressed by dopamine receptor agonists such as apomorphine and apocodeine. The suppressive effects of these agonists were reversibly inhibited by L750667, a D(4)-receptor antagonist but not by D(2)- or D(3)-receptor antagonists. In addition, PD168077, a selective dopamine D(4)-receptor agonist, also protected against H/R-induced cell death. These results suggest that H/R causes oxidative stress-induced cell death and that the activation of dopamine D(4) receptors protects against H/R-induced cell death in HT22 cells.
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Affiliation(s)
- Saori Shimada
- Research Unit of Pharmacology, Department of Clinical Pharmacy, School of Pharmacy, Nihon University, Japan
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33
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Duclot F, Meffre J, Jacquet C, Gongora C, Maurice T. Mice knock out for the histone acetyltransferase p300/CREB binding protein-associated factor develop a resistance to amyloid toxicity. Neuroscience 2010; 167:850-63. [PMID: 20219649 DOI: 10.1016/j.neuroscience.2010.02.055] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2009] [Revised: 02/11/2010] [Accepted: 02/20/2010] [Indexed: 10/19/2022]
Abstract
p300/CREB binding protein-associated factor (PCAF) regulates gene expression by acting through histone acetylation and as a transcription coactivator. Although histone acetyltransferases were involved in the toxicity induced by amyloid-beta (Abeta) peptides, nothing is known about PCAF. We here analyzed the sensitivity of PCAF knockout (KO) mice to the toxic effects induced by i.c.v. injection of Abeta(25-35) peptide, a nontransgenic model of Alzheimer's disease. PCAF wild-type (WT) and KO mice received Abeta(25-35) (1, 3 or 9 nmol) or scrambled Abeta(25-35) (9 nmol) as control. After 7 days, Abeta(25-35) toxicity was measured in the hippocampus of WT mice by a decrease in CA1 pyramidal cells and increases in oxidative stress, endoplasmic reticulum stress and induction of apoptosis. Memory deficits were observed using spontaneous alternation, water-maze learning and passive avoidance. Non-treated PCAF KO mice showed a decrease in CA1 cells and learning alterations. However, Abeta(25-35) injection failed to induce toxicity or worsen the deficits. This resistance to Abeta(25-35) toxicity did not involve changes in glutamate or acetylcholine systems. Examination of enzymes involved in Abeta generation or degradation revealed changes in transcription of presenilins, activity of neprilysin (NEP) and an absence of Abeta(25-35)-induced regulation of NEP activity in PCAF KO mice, partly due to an altered expression of somatostatin (SRIH). We conclude that PCAF regulates the expression of proteins involved in Abeta generation and degradation, thus rendering PCAF KO insensitive to amyloid toxicity. Modulating acetyltransferase activity may offer a new way to develop anti-amyloid therapies.
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Affiliation(s)
- F Duclot
- INSERM U 710, Montpellier, France
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34
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Morales P, Fiedler JL, Andrés S, Berrios C, Huaiquín P, Bustamante D, Cardenas S, Parra E, Herrera-Marschitz M. Plasticity of hippocampus following perinatal asphyxia: effects on postnatal apoptosis and neurogenesis. J Neurosci Res 2009; 86:2650-62. [PMID: 18512760 DOI: 10.1002/jnr.21715] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Asphyxia during delivery produces long-term deficits in brain development, including hippocampus. We investigated hippocampal plasticity after perinatal asphyxia, measuring postnatal apoptosis and neurogenesis. Asphyxia was performed by immersing rat fetuses with uterine horns removed from ready-to-deliver rats into a water bath for 20 min. Caesarean-delivered pups were used as controls. The animals were euthanized 1 week or 1 month after birth. Apoptotic nuclear morphology and DNA breaks were assessed by Hoechst and TUNEL assays. Neurogenesis was estimated by bromodeoxyuridine/MAP-2 immunocytochemistry, and the levels and expression of proteins related to apoptosis and cell proliferation were measured by Western blots and in situ hybridization, respectively. There was an increase of apoptosis in CA1, CA3, and dentate gyrus (DG) and cell proliferation and neurogenesis in CA1, DG, and hilus regions of hippocampus 1 week after asphyxia. The increase of apoptosis in CA3 and cell proliferation in the suprapyramidal band of DG was still observed 1 month following asphyxia. There was an increase of BAD, BCL-2, ERK2, and bFGF levels in whole hippocampus and bFGF expression in CA1 and CA2 and hilus at P7 and P30. There was a concomitant decrease of phosphorylated-BAD (Ser112) levels. The increase of BAD levels supports the idea of delayed cell death after perinatal asphyxia, whereas the increases of BCL-2, ERK2, and bFGF levels suggest the activation of neuroprotective and repair pathways. In conclusion, perinatal asphyxia induces short- and long-term regionally specific plastic changes, including delayed cell death and neurogenesis, involving pro- and antiapoptotic as well as mitogenic proteins, favoring hippocampal functional recovery.
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Affiliation(s)
- P Morales
- Programme of Molecular and Clinical Pharmacology, ICBM, Medical Faculty, University of Chile, Santiago, Chile
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35
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Flamant L, Toffoli S, Raes M, Michiels C. Hypoxia regulates inflammatory gene expression in endothelial cells. Exp Cell Res 2009; 315:733-47. [DOI: 10.1016/j.yexcr.2008.11.020] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2008] [Revised: 10/29/2008] [Accepted: 11/23/2008] [Indexed: 02/02/2023]
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Guo SY, Yang GP, Jiang DJ, Wang F, Song T, Tan XH, Sun ZQ. Protection of capsaicin against hypoxia–reoxygenation-induced apoptosis of rat hippocampal neurons. Can J Physiol Pharmacol 2008; 86:785-92. [PMID: 19011674 DOI: 10.1139/y08-083] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The aim of this study was to investigate the effect of capsaicin on hypoxia–reoxygenation (H/R)-induced apoptosis in primary rat hippocampal neurons. Three hours of hypoxia (1% O2) and subsequent reoxygenation for 24 h significantly increased the apoptotic death of hippocampal neurons, as evidenced by increases in both TUNEL-positive cell number and caspase-3 activity. Pretreatment with capsaicin (3–30 µmol/L) or the caspase-3-specific inhibitor acetyl-DEVD-CHO (100 µmol/L) markedly attenuated H/R-induced apoptosis in hippocampal neurons. Capsaicin also markedly induced the phosphorylation of Akt. The phosphoinositide 3-kinase (PI3K) inhibitor LY294002 (10 µmol/L) prevented any capsaicin-induced survival effect in hippocampal neurons. Intracellular levels of reactive oxygen species (ROS), which were greatly increased after H/R, were significantly inhibited by capsaicin, pyrrolidine dithiocarbamate (PDTC) (50 µmol/L), and LY294002. Taken together, these data suggest that capsaicin protects against H/R-induced apoptosis of hippocampal neurons via the PI3K/Akt-mediated signaling pathway, which is related to the inhibition of oxidative stress and caspase-3 activation.
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Affiliation(s)
- Shi-Yin Guo
- School of Public Health, Central South University, Xiang-Ya Road 110, Changsha 410078, China
- Faculty of Food Science and Technology, Hunan Agricultural University, Changsha, China
- Center of Clinical Pharmacology, the Third Xiangya Hospital, Central South University, Changsha, China
- Department of Pharmacology, School of Pharmaceutical Sciences, Central South University, Changsha, China
| | - Guo-Ping Yang
- School of Public Health, Central South University, Xiang-Ya Road 110, Changsha 410078, China
- Faculty of Food Science and Technology, Hunan Agricultural University, Changsha, China
- Center of Clinical Pharmacology, the Third Xiangya Hospital, Central South University, Changsha, China
- Department of Pharmacology, School of Pharmaceutical Sciences, Central South University, Changsha, China
| | - De-Jian Jiang
- School of Public Health, Central South University, Xiang-Ya Road 110, Changsha 410078, China
- Faculty of Food Science and Technology, Hunan Agricultural University, Changsha, China
- Center of Clinical Pharmacology, the Third Xiangya Hospital, Central South University, Changsha, China
- Department of Pharmacology, School of Pharmaceutical Sciences, Central South University, Changsha, China
| | - Feng Wang
- School of Public Health, Central South University, Xiang-Ya Road 110, Changsha 410078, China
- Faculty of Food Science and Technology, Hunan Agricultural University, Changsha, China
- Center of Clinical Pharmacology, the Third Xiangya Hospital, Central South University, Changsha, China
- Department of Pharmacology, School of Pharmaceutical Sciences, Central South University, Changsha, China
| | - Tao Song
- School of Public Health, Central South University, Xiang-Ya Road 110, Changsha 410078, China
- Faculty of Food Science and Technology, Hunan Agricultural University, Changsha, China
- Center of Clinical Pharmacology, the Third Xiangya Hospital, Central South University, Changsha, China
- Department of Pharmacology, School of Pharmaceutical Sciences, Central South University, Changsha, China
| | - Xing-He Tan
- School of Public Health, Central South University, Xiang-Ya Road 110, Changsha 410078, China
- Faculty of Food Science and Technology, Hunan Agricultural University, Changsha, China
- Center of Clinical Pharmacology, the Third Xiangya Hospital, Central South University, Changsha, China
- Department of Pharmacology, School of Pharmaceutical Sciences, Central South University, Changsha, China
| | - Zhen-Qiu Sun
- School of Public Health, Central South University, Xiang-Ya Road 110, Changsha 410078, China
- Faculty of Food Science and Technology, Hunan Agricultural University, Changsha, China
- Center of Clinical Pharmacology, the Third Xiangya Hospital, Central South University, Changsha, China
- Department of Pharmacology, School of Pharmaceutical Sciences, Central South University, Changsha, China
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37
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Sermeus A, Cosse JP, Crespin M, Mainfroid V, de Longueville F, Ninane N, Raes M, Remacle J, Michiels C. Hypoxia induces protection against etoposide-induced apoptosis: molecular profiling of changes in gene expression and transcription factor activity. Mol Cancer 2008; 7:27. [PMID: 18366759 PMCID: PMC2330149 DOI: 10.1186/1476-4598-7-27] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2007] [Accepted: 03/26/2008] [Indexed: 12/13/2022] Open
Abstract
Background it is now well established that hypoxia renders tumor cells resistant to radio- but also chemotherapy. However, few elements are currently available as for the mechanisms underlying this protection. Results in this study, physiological hypoxia was shown to inhibit apoptosis induced in HepG2 cells by etoposide. Indeed, hypoxia reduced DNA fragmentation, caspase activation and PARP cleavage. The DNA binding activity of 10 transcription factors was followed while the actual transcriptional activity was measured using specific reporter plasmids. Of note is the inhibition of the etoposide-induced activation of p53 under hypoxia. In parallel, data from low density DNA microarrays indicate that the expression of several pro- and anti-apoptotic genes was modified, among which are Bax and Bak whose expression profile paralleled p53 activity. Cluster analysis of data unravels several possible pathways involved in the hypoxia-induced protection against etoposide-induced apoptosis: one of them could be the inhibition of p53 activity under hypoxia since caspase 3 activity parallels Bax and Bak expression profile. Moreover, specific downregulation of HIF-1α by RNA interference significantly enhanced apoptosis under hypoxia possibly by preventing the hypoxia mediated decrease in Bak expression without altering Bax expression. Conclusion these results are a clear demonstration that hypoxia has a direct protective effect on apoptotic cell death. Moreover, molecular profiling points to putative pathways responsible for tumor growth in challenging environmental conditions and cancer cell resistance to chemotherapeutic agents.
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Affiliation(s)
- Audrey Sermeus
- URBC, FUNDP-University of Namur, 61 rue de Bruxelles, 5000 Namur, Belgium.
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Strauss KI. Antiinflammatory and neuroprotective actions of COX2 inhibitors in the injured brain. Brain Behav Immun 2008; 22:285-98. [PMID: 17996418 PMCID: PMC2855502 DOI: 10.1016/j.bbi.2007.09.011] [Citation(s) in RCA: 74] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/03/2007] [Revised: 09/14/2007] [Accepted: 09/20/2007] [Indexed: 12/22/2022] Open
Abstract
Overexpression of COX2 appears to be both a marker and an effector of neural damage after a variety of acquired brain injuries, and in natural or pathological aging of the brain. COX2 inhibitors may be neuroprotective in the brain by reducing prostanoid and free radical synthesis, or by directing arachidonic acid down alternate metabolic pathways. The arachidonic acid shunting hypothesis proposes that COX2 inhibitors' neuroprotective effects may be mediated by increased formation of potentially beneficial eicosanoids. Under conditions where COX2 activity is inhibited, arachidonic acid accumulates or is converted to eicosanoids via lipoxygenases and cytochrome P450 (CYP) epoxygenases. Several P450 eicosanoids have been demonstrated to have beneficial effects in the brain and/or periphery. We suspect that arachidonic acid shunting may be as important to functional recovery after brain injuries as altered prostanoid formation per se. Thus, COX2 inhibition and arachidonic acid shunting have therapeutic implications beyond the suppression of prostaglandin synthesis and free radical formation.
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Affiliation(s)
- Kenneth I. Strauss
- Mayfield Neurotrauma Research Lab, Department of Neurosurgery, University of Cincinnati College of Medicine, 231 Albert Sabin Way, ML515, Cincinnati, OH 45267 ()
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Abstract
NF-kappaB is a well-characterized transcription factor with multiple physiological and pathological functions. NF-kappaB plays important roles in the development and maturation of lymphoids, regulation of immune and inflammatory response, and cell death and survival. The influence of NF-kappaB on cell survival could be protective or destructive, depending on types, developmental stages of cells, and pathological conditions. The complexity of NF-kappaB in cell death and survival derives from its multiple roles in regulating the expression of a broad array of genes involved in promoting cell death and survival. The activation of NF-kappaB has been found in many neurological disorders, but its actual roles in pathogenesis are still being debated. Many compounds with neuroprotective actions are strongly associated with the inhibition of NF-kappaB, leading to speculation that blocking the pathological activation of NF-kappaB could offer neuroprotective effects in certain neurodegenerative conditions. This paper reviews the recent developments in understanding the dual roles of NF-kappaB in cell death and survival and explores its possible usefulness in treating neurological diseases. This paper will summarize the genes regulated by NF-kappaB that are involved in cell death and survival to elucidate why NF-kappaB promotes cell survival in some conditions while facilitating cell death in other conditions. This paper will also focus on the effects of various NF-kappaB inhibitors on neuroprotection in certain pathological conditions to speculate if NF-kappaB is a potential target for neuroprotective therapy.
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Affiliation(s)
- Zheng-hong Qin
- Department of Pharmacology, Soochow University School of Medicine, Suzhou 215123, China.
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Schapansky J, Olson K, Van Der Ploeg R, Glazner G. NF-κB activated by ER calcium release inhibits Aβ-mediated expression of CHOP protein: Enhancement by AD-linked mutant presenilin 1. Exp Neurol 2007; 208:169-76. [DOI: 10.1016/j.expneurol.2007.04.009] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2006] [Revised: 04/19/2007] [Accepted: 04/24/2007] [Indexed: 02/03/2023]
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Maystadt I, Rezsöhazy R, Barkats M, Duque S, Vannuffel P, Remacle S, Lambert B, Najimi M, Sokal E, Munnich A, Viollet L, Verellen-Dumoulin C. The nuclear factor kappaB-activator gene PLEKHG5 is mutated in a form of autosomal recessive lower motor neuron disease with childhood onset. Am J Hum Genet 2007; 81:67-76. [PMID: 17564964 PMCID: PMC1950913 DOI: 10.1086/518900] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2007] [Accepted: 04/05/2007] [Indexed: 12/11/2022] Open
Abstract
Lower motor neuron diseases (LMNDs) include a large spectrum of clinically and genetically heterogeneous disorders. Studying a large inbred African family, we recently described a novel autosomal recessive LMND variant characterized by childhood onset, generalized muscle involvement, and severe outcome, and we mapped the disease gene to a 3.9-cM interval on chromosome 1p36. We identified a homozygous missense mutation (c.1940 T-->C [p.647 Phe-->Ser]) of the Pleckstrin homology domain-containing, family G member 5 gene, PLEKHG5. In transiently transfected HEK293 and MCF10A cell lines, we found that wild-type PLEKHG5 activated the nuclear factor kappa B (NF kappa B) signaling pathway and that both the stability and the intracellular location of mutant PLEKHG5 protein were altered, severely impairing the NF kappa B transduction pathway. Moreover, aggregates were observed in transiently transfected NSC34 murine motor neurons overexpressing the mutant PLEKHG5 protein. Both loss of PLEKHG5 function and aggregate formation may contribute to neurotoxicity in this novel form of LMND.
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Affiliation(s)
- Isabelle Maystadt
- Centre de Génétique Humaine et Unité de Génétique Médicale, Université Catholique de Louvain, Brussels, Belgium.
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Frazier DP, Wilson A, Dougherty CJ, Li H, Bishopric NH, Webster KA. PKC-α and TAK-1 are intermediates in the activation ofc-Jun NH2-terminal kinase by hypoxia-reoxygenation. Am J Physiol Heart Circ Physiol 2007; 292:H1675-84. [PMID: 17209006 DOI: 10.1152/ajpheart.01132.2006] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
c-Jun NH2-terminal kinase (JNK), a member of the MAPK family of protein kinases, is a stress-response kinase that is activated by proinflammatory cytokines and growth factors coupled to membrane receptors or through nonreceptor pathways by stimuli such as heat shock, UV irradiation, protein synthesis inhibitors, and conditions that elevate the levels of reactive oxygen intermediates (ROI). Ischemia followed by reperfusion or hypoxia with reoxygenation represents a condition of high oxidative stress where JNK activation is associated with elevated ROI. We recently demonstrated that the activation of JNK by this condition is initiated by ROI generated by mitochondrial electron transport and involves sequential activation of the proline-rich kinase 2 and the small GTP-binding factors Rac-1 and Cdc42. Here we present evidence that protein kinase C (PKC) and transforming growth factor-β-activated kinase-1 (TAK-1) are also components of this pathway. Inhibition of PKC with the broad-range inhibitor calphostin C, the PKC-α/β-selective inhibitor Go9367, or adenovirus-expressing dominant-negative PKC-α blocked the phosphorylation of proline-rich kinase 2 and JNK. Reoxygenation activated the mitogen-activated protein kinase kinase kinase, TAK-1, and promoted the formation of a complex containing Rac-1, TAK-1, and JNK but not apoptosis-stimulating kinase-1 or p21-activated kinase-1, which was detected within the first 10 min of reoxygenation. These results identify two new components, PKC and TAK-1, that have not been previously described in this signaling pathway.
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Affiliation(s)
- Donna P Frazier
- Department of Molecular and Cellular Pharmacology, Vascular Biology Institute, University of Miami School of Medicine, Miami, Florida 33136, USA
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Syed NA, Andersen PL, Warrington RC, Xiao W. Uev1A, a ubiquitin conjugating enzyme variant, inhibits stress-induced apoptosis through NF-kappaB activation. Apoptosis 2007; 11:2147-57. [PMID: 17041755 DOI: 10.1007/s10495-006-0197-3] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
We have previously shown that UEV1 is up-regulated in all tumor cell lines examined and when SV40-transformed human embryonic kidney cells undergo immortalization; however, it is unclear whether and how UEV1 plays a critical role in this process. UEV1A encodes a ubiquitin conjugating enzyme variant, which is required for Ubc13 (ubiquitin conjugating enzyme) catalyzed poly-ubiquitination of target proteins through Lys63-linked chains. One of the target proteins is NEMO/IKKgamma (nuclear factor-kappaB essential modulator/inhibitor of kappaB protein kinase), a regulatory subunit of IkappaB kinase in the NF-kappaB signaling pathway. In this report, we show that constitutive high-level expression of UEV1A alone in cultured human cells was sufficient to cause a significant increase in NF-kappaB activity as well as the expression of its target anti-apoptotic protein, Bcl-2 (B-cell leukemia/lymphoma 2). Overexpression of UEV1A also conferred prolonged cell survival under serum-deprived conditions, and protected cells against apoptosis induced by diverse stressing agents. All of the effects of Uev1A were reversible upon suppression of UEV1 expression by RNA interference. Our observations presented in this report provide evidence that Uev1A is a critical regulatory component in the NF-kappaB signaling pathway in response to environmental stresses and identify UEV1A as a potential proto-oncogene.
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Affiliation(s)
- Noor A Syed
- Department of Microbiology and Immunology, University of Saskatchewan, Saskatoon, Saskatchewan, S7N-5E5, Canada
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Abstract
UNLABELLED Cytotoxic anti-cancer agents induce apoptosis in tumor and normal tissues. Therefore, it is important to investigate which factors determine these apoptotic processes and hence their likely impact on therapeutic gain. Radiation-induced apoptosis in tumors may be inhibited due to mutations of apoptotic elements or to tumor microenvironmental conditions arising from vascular insufficiency. Tumors typically contain regions of hypoxia, low glucose and acidosis. Hypoxic cells compromise treatment partly because of reduced fixation of damage during radiotherapy and partly because they promote a more malignant phenotype. There is also evidence that hypoxia may inhibit apoptosis. For some cell types, concurrent hypoxia may modulate radiation-induced apoptosis while, for others, post-irradiation hypoxia may be required. This may reflect the activity of different apoptotic pathways. Pathways involving mitochondrial components as well as regulation of SAPK and Fas have been implicated. In addition, several key stages in apoptosis are sensitive to depletion of cellular energy reserves, which results from hypoxia and low glucose conditions. There is also evidence that low pH in tumors can interfere with radiation-induced apoptosis, partly through cell cycle arrest and other undefined mechanisms. CONCLUSIONS Hypoxia, low glucose and acidosis influence radiation-induced apoptosis and thus may be detrimental to radiotherapy.
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Affiliation(s)
- Alistair Hunter
- Radiation Oncology, Department of Radiation Medicine, University of Cape Town and Groote Schuur Hospital, Observatory, Cape Town, South Africa.
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Marini AM, Jiang X, Wu X, Pan H, Guo Z, Mattson MP, Blondeau N, Novelli A, Lipsky RH. Preconditioning and neurotrophins: a model for brain adaptation to seizures, ischemia and other stressful stimuli. Amino Acids 2006; 32:299-304. [PMID: 16998712 DOI: 10.1007/s00726-006-0414-y] [Citation(s) in RCA: 65] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2005] [Accepted: 08/09/2006] [Indexed: 01/16/2023]
Abstract
The amino acid glutamate, the major excitatory neurotransmitter in the central nervous system, activates receptors coupled to calcium influx. Excessive activation of glutamate receptors in conditions such as severe epileptic seizures or stroke can kill neurons in a process called excitotoxicity. However, subtoxic levels of activation of the N-methyl-D-aspartate (NMDA) type of glutamate receptor elicit adaptive responses in neurons that enhance their ability to withstand more severe stress. A variety of stimuli induce adaptive responses to protect neurons. For example, sublethal ischemic episodes or a mild epileptic insult can protect neurons in a process referred to as tolerance. The molecular mechanisms that protect neurons by these different stressful stimuli are largely unknown but they share common features such as the transcription factor, nuclear factor kappa B (NF-kappaB), which is activated by ischemic and epileptic preconditioning as well as exposure to subtoxic NMDA concentrations. In this article, we describe stress-induced neuroprotective mechanisms highlighting the role of brain-derived neurotrophic factor (BDNF), a protein that plays a crucial role in neuronal survival and maintenance, neurogenesis and learning and memory.
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Affiliation(s)
- A M Marini
- Department of Neurology and Neuroscience Program, Uniformed Services University of the Health Sciences, Bethesda, MD 20814, USA.
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Abstract
Hypoxia is an important nongenotoxic stress that modulates the tumor suppressor activity of p53 during malignant progression. In this study, we investigated how genotoxic and nongenotoxic stresses regulate p53 association with chromatin, p53 transcriptional activity, and p53-dependent apoptosis. We found that genotoxic and nongenotoxic stresses result in the accumulation and binding of the p53 tumor suppressor protein to the same cognate binding sites in chromatin. However, it is the stress that determines whether downstream signaling is mediated by association with transcriptional coactivators. In contrast to p53 induced by DNA-damaging agents, hypoxia-induced p53 has primarily transrepression activity. Using extensive microarray analysis, we identified families of repressed targets of p53 that are involved in cell signaling, DNA repair, cell cycle control, and differentiation. Following our previous study on the contribution of residues 25 and 26 to p53-dependent hypoxia-induced apoptosis, we found that residues 25-26 and 53-54 and the polyproline- and DNA-binding regions are also required for both gene repression and the induction of apoptosis by p53 during hypoxia. This study defines a new role for residues 53 and 54 of p53 in regulating transrepression and demonstrates that 25-26 and 53-54 work in the same pathway to induce apoptosis through gene repression.
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Affiliation(s)
- Ester M Hammond
- Division of Radiation and Cancer Biology, Department of Radiation Oncology, Stanford University, Stanford, CA 94303-5152, USA
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Rybnikova E, Sitnik N, Gluschenko T, Tjulkova E, Samoilov MO. The preconditioning modified neuronal expression of apoptosis-related proteins of Bcl-2 superfamily following severe hypobaric hypoxia in rats. Brain Res 2006; 1089:195-202. [PMID: 16638610 DOI: 10.1016/j.brainres.2006.03.053] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2005] [Revised: 03/14/2006] [Accepted: 03/16/2006] [Indexed: 10/24/2022]
Abstract
The patterns of expression of the Bcl-2, Bax, and Bcl-xL proteins were examined immunocytochemically in rat hippocampus and neocortex after severe hypobaric hypoxia (180 Torr for 3 h) and severe hypoxia preconditioned by intermittent mild hypoxia (360 Torr for 2 h daily, for 3 consecutive days, 24 h prior to severe hypoxia). As revealed by TUNEL assay, severe hypobaric hypoxia produced extensive apoptotic damage to the neurons of hippocampal CA1-CA4 and the neocortex but not the dentate gyrus granule cells. Remarkable posthypoxic up-regulation of Bax expression maximal at 24 h was detected in the CA1-CA4 areas of hippocampus and neocortex 3-72 h after severe hypoxia. The preconditioning to severe hypoxia protected neurons from the posthypoxic apoptotic transformations, the up-regulation of Bax expression, and resulted in persistent overexpression of Bcl-2 and Bcl-xL. We conclude that the protective action of hypoxic preconditioning is at least in part mediated by shifting of neuronal Bax/Bcl-2-Bcl-xL ratio to a favor of antiapoptotic proteins Bcl-2 and Bcl-xL.
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Affiliation(s)
- Elena Rybnikova
- The Laboratory of Neuroendocrinology, Pavlov Institute of Physiology, Russian Academy of Sciences, Makarova emb. 6, St. Petersburg 199034, Russia
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van den Tweel ERW, Kavelaars A, Lombardi MS, Groenendaal F, May M, Heijnen CJ, van Bel F. Selective inhibition of nuclear factor-kappaB activation after hypoxia/ischemia in neonatal rats is not neuroprotective. Pediatr Res 2006; 59:232-6. [PMID: 16439584 DOI: 10.1203/01.pdr.0000196807.10122.5f] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Activated nuclear factor-kappaB (NFkappaB) has been shown to increase transcription of several genes that could potentially contribute to neuronal damage, such as proinflammatory cytokines, chemokines, and inducible nitric oxide synthase. The aim of our study was to investigate whether inhibition of NFkappaB activation could prevent hypoxia/ischemia (HI)-induced cerebral damage in neonatal rats. We used a cell permeable peptide (NEMO binding domain [NBD] peptide) that is known to prevent the association of the regulatory protein NEMO with IKK, the kinase that activates NFkappaB. Via this mechanism, the NBD peptide can specifically block the activation of NFkappaB, without inhibiting basal NFkappaB activity. Cerebral HI was induced in neonatal rats by occlusion of the right carotid artery followed by 90 min of hypoxia (Fio(2) = 0.08). Immediately upon reoxygenation, as well as 6 and 12 h later, rats were treated with vehicle or NBD peptide (20 mg/kg i.p.). Histologic analysis of brain damage was performed at 6 wk after HI. To assess NFkappaB activation, electromobility shift assays (EMSAs) were performed on brain nuclear extracts obtained 6 h after reoxygenation. Increased NFkappaB activity could be shown at 6 h after HI in both hemispheres. Peripheral administration of NBD peptide prevented this HI-induced increase in NFkappaB activity in both hemispheres. Histologic analysis of long-term cerebral damage revealed that inhibition of NFkappaB activation by administration of NBD peptide at 0, 6, and 12 h after HI resulted in an increment of neuronal damage. In conclusion, our data suggest that inhibition of NFkappaB activation using NBD peptide early after HI increases brain damage in neonatal rats.
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Abstract
Hypoxia represents one of the most physiologically relevant stresses, having significant roles in both normal development and malignant progression. Exposure to severe hypoxia leads to the accumulation of p53 which can in turn lead to rapid apoptosis. In contrast to the response to DNA-damaging agents, hypoxia-induced p53 has little or no transcriptional transactivation capabilities and instead seems to function primarily as a transrepressor in order to induce apoptosis.
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Affiliation(s)
- Ester M Hammond
- Department of Radiation Oncology, Centre for Clinical Sciences Research, Stanford University, Stanford, CA 94303-5152, USA.
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50
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Abstract
In locally advanced solid tumors, oxygen (O2) delivery is frequently reduced or even abolished. This is due to abnormalities of the tumor microvasculature, adverse diffusion geometries, and tumor-associated and/or therapy-induced anemia. Up to 50-60% of locally advanced solid tumors may exhibit hypoxic and/or anoxic tissue areas that are heterogeneously distributed within the tumor mass. In approximately 30% of pretreatment patients, a decreased O2 transport capacity of the blood as a result of tumor-associated anemia can greatly contribute to the development of tumor hypoxia. While normal tissues can compensate for this O2 deficiency status by a rise in blood flow rate, locally advanced tumors (or at least larger tumor areas) cannot adequately counteract the restriction in O2 supply and thus the development of hypoxia. Hypoxia-induced alteration in gene expression and thus in the proteome (< 1% O2, or < 7 mmHg), and/or genome changes (< 0.1% O2, or < 0.7 mmHg) may promote tumor progression via mechanisms enabling cells to overcome nutritive deprivation, to escape from the hostile metabolic microenvironment and to favor unrestricted growth. Sustained hypoxia may thus lead to cellular changes resulting in a more clinically aggressive phenotype. In addition, hypoxia is known to directly or indirectly confer resistance to X- and gamma-radiation, and some chemotherapies leading to treatment failures. Whereas strong evidence has accumulated that hypoxia plays a pivotal role in tumor progression and acquired treatment resistance, the mechanism(s) by which treatment efficacy and survival may be compromised by anemia (independent of hypoxia) are not fully understood.
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Affiliation(s)
- Peter Vaupel
- Institute of Physiology and Pathophysiology, University of Mainz, Duesbergweg 6, 55099 Mainz, Germany.
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