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Dong D, Reece EA, Yang P. The Nrf2 Activator Vinylsulfone Reduces High Glucose-Induced Neural Tube Defects by Suppressing Cellular Stress and Apoptosis. Reprod Sci 2016; 23:993-1000. [PMID: 26802109 DOI: 10.1177/1933719115625846] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The nuclear factor erythroid 2-related factor 2 (Nrf2) signaling pathway is one of the primary pathways responsible for the cellular defense system against oxidative stress. Oxidative stress-induced apoptosis is a causal event in diabetic embryopathy. Thus, the Nrf2 pathway may play an important role in the induction of diabetic embryopathy. In the present study, we investigated the potentially protective effect of the Nrf2 activator, vinylsulfone, on high glucose-induced cellular stress, apoptosis, and neural tube defects (NTDs). Embryonic day 8.5 (E8.5) whole mouse embryos were cultured in normal (5 mmol/L) or high (16.7 mmol/L) glucose conditions, with or without vinylsulfone. At a concentration of 10 μmol/L, vinylsulfone had an inhibitory effect on high glucose-induced NTD formation, but it was not significant. At a concentration of 20 μmol/L, vinylsulfone significantly reduced high glucose-induced NTDs. In addition, 20 μmol/L vinylsulfone abrogated the high glucose-induced oxidative stress markers lipid hydroperoxide (LPO), 4-hydroxynonenal (4-HNE), and nitrotyrosine-modified proteins. The high glucose-induced endoplasmic reticulum (ER) stress biomarkers were also suppressed by 20 μmol/L vinylsulfone through the inhibition of phosphorylated protein kinase RNA-like ER kinase (PERK), inositol requiring protein 1α (IRE1a), eukaryotic initiation factor 2α (eIF2a), upregulated C/EBP-homologous protein (CHOP), binding immunoglobulin protein (BiP), and x-box binding protein 1 (XBP1) messenger RNA splicing. Furthermore, 20 μmol/L vinylsulfone abolished caspase 3 and caspase 8 cleavage, markers of apoptosis, in embryos cultured under high glucose conditions. The Nrf2 activator, vinylsulfone, is protective against high glucose-induced cellular stress, caspase activation, and subsequent NTD formation. Our data suggest that vinylsulfone supplementation is a potential therapy for diabetes-associated neurodevelopmental defects.
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Affiliation(s)
- Daoyin Dong
- Department of Obstetrics, Gynecology & Reproductive Sciences, Nashville, TN, USA
| | - E Albert Reece
- Department of Obstetrics, Gynecology & Reproductive Sciences, Nashville, TN, USA Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, Baltimore, MD, USA
| | - Peixin Yang
- Department of Obstetrics, Gynecology & Reproductive Sciences, Nashville, TN, USA Department of Biochemistry and Molecular Biology, University of Maryland School of Medicine, Baltimore, MD, USA
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202
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de Oliveira MR. Phloretin-induced cytoprotective effects on mammalian cells: A mechanistic view and future directions. Biofactors 2016; 42:13-40. [PMID: 26826024 DOI: 10.1002/biof.1256] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/28/2015] [Accepted: 11/19/2015] [Indexed: 11/11/2022]
Abstract
Phloretin (C15 H14 O5 ), a dihydrochalcone flavonoid, is mainly found in fruit, leaves, and roots of apple tree. Phloretin exerts antioxidant, anti-inflammatory, and anti-tumor activities in mammalian cells through mechanisms that have been partially elucidated throughout the years. Phloretin bioavailability is well known in humans, but still remains to be better studied in experimental animals, such as mouse and rat. The focus of the present review is to gather information regarding the mechanisms involved in the phloretin-elicited effects in different in vitro and in vivo experimental models. Several manuscripts were analyzed and data raised by authors were described and discussed here in a mechanistic manner. Comparisons between the effects elicited by phloretin and phloridzin were made whenever possible, as well as with other polyphenols, clarifying questions about the use of phloretin as a potential therapeutic agent. Toxicological aspects associated to phloretin exposure were also discussed here. Furthermore, a special section containing future directions was created as a suggestive guide towards the elucidation of phloretin-related actions in mammalian cells and tissues.
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Affiliation(s)
- Marcos Roberto de Oliveira
- Department of Chemistry/ICET, Postgraduate Program in Chemistry (PPGQ), Federal University of Mato Grosso (UFMT), CEP, Cuiaba, MT, Brazil
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203
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Oliveira MRD, Nabavi SF, Daglia M, Rastrelli L, Nabavi SM. Epigallocatechin gallate and mitochondria-A story of life and death. Pharmacol Res 2015; 104:70-85. [PMID: 26731017 DOI: 10.1016/j.phrs.2015.12.027] [Citation(s) in RCA: 106] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/09/2015] [Revised: 12/20/2015] [Accepted: 12/23/2015] [Indexed: 01/05/2023]
Abstract
Epigallocatechin gallate (EGCG) is a flavonoid belonging to the chemical class of falvan-3-ols (catechins) esterified with gallic acid. It is the main catechin found in green tea (Camellia sinensis L.) accounting for about 50% of its total polyphenols. Extensive research performed in recent years has revealed that green tea demonstrates a wide range of positive biological activities against serious chronic diseases such as cardiovascular and neurodegenerative pathologies, cancer, metabolic syndrome and type 2 diabetes. These protective properties can be traced back to the potent antioxidant and anti-inflammatory activities of EGCG. Recent studies have suggested that it may exert its beneficial effects by modulating mitochondrial functions impacting mitochondrial biogenesis, bioenergetic control (ATP production and anabolism), alteration of the cell cycle, and mitochondria-related apoptosis. This review evaluates recent evidence on the ability of EGCG to exert critical influence on the above mentioned pathways.
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Affiliation(s)
- Marcos Roberto de Oliveira
- Department of Chemistry, ICET, Federal University of Mato Grosso (UFMT), Av. Fernando Corrêa da Costa, 2367, CEP 78060-900 Cuiabá, MT, Brazil.
| | - Seyed Fazel Nabavi
- Applied Biotechnology Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran
| | - Maria Daglia
- Department of Drug Sciences, Medicinal Chemistry and Pharmaceutical Technology Section, University of Pavia, Italy
| | - Luca Rastrelli
- Dipartimento di Farmacia, University of Salerno, via Giovanni Paolo II, 84084 Fisciano, Italy
| | - Seyed Mohammad Nabavi
- Applied Biotechnology Research Center, Baqiyatallah University of Medical Sciences, Tehran, Iran
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204
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Chang HC, Yang HL, Pan JH, Korivi M, Pan JY, Hsieh MC, Chao PM, Huang PJ, Tsai CT, Hseu YC. Hericium erinaceus Inhibits TNF-α-Induced Angiogenesis and ROS Generation through Suppression of MMP-9/NF-κB Signaling and Activation of Nrf2-Mediated Antioxidant Genes in Human EA.hy926 Endothelial Cells. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2015; 2016:8257238. [PMID: 26823953 PMCID: PMC4707368 DOI: 10.1155/2016/8257238] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/05/2015] [Revised: 10/14/2015] [Accepted: 10/28/2015] [Indexed: 11/21/2022]
Abstract
Hericium erinaceus (HE) is an edible mushroom that has been shown to exhibit anticancer and anti-inflammatory activities. We investigated the antiangiogenic and antioxidant potentials of ethanol extracts of HE in human endothelial (EA.hy926) cells upon tumor necrosis factor-α- (TNF-α-) stimulation (10 ng/mL). The underlying molecular mechanisms behind the pharmacological efficacies were elucidated. We found that noncytotoxic concentrations of HE (50-200 μg/mL) significantly inhibited TNF-α-induced migration/invasion and capillary-like tube formation of endothelial cells. HE treatment suppressed TNF-α-induced activity and/or overexpression of matrix metalloproteinase-9 (MMP-9) and intercellular adhesion molecule-1 (ICAM-1). Furthermore, HE downregulated TNF-α-induced nuclear translocation and transcriptional activation of nuclear factor-κB (NF-κB) followed by suppression of I-κB (inhibitor-κB) degradation. Data from fluorescence microscopy illustrated that increased intracellular ROS production upon TNF-α-stimulation was remarkably inhibited by HE pretreatment in a dose-dependent manner. Notably, HE triggered antioxidant gene expressions of heme oxygenase-1 (HO-1), γ-glutamylcysteine synthetase (γ-GCLC), and glutathione levels, which may contribute to inhibition of ROS. Increased antioxidant status was associated with upregulated nuclear translocation and transcriptional activation of NF-E2 related factor-2 (Nrf2) in HE treated cells. Our findings conclude that antiangiogenic and anti-inflammatory activities of H. erinaceus may contribute to its anticancer property through modulation of MMP-9/NF-κB and Nrf2-antioxidant signaling pathways.
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Affiliation(s)
- Hebron C. Chang
- Department of Biotechnology and Bioinformatics, Asia University, Taichung 41354, Taiwan
| | - Hsin-Ling Yang
- Institute of Nutrition, College of Biopharmaceutical and Food Sciences, China Medical University, Taichung 40402, Taiwan
| | - Jih-Hao Pan
- Department of Biotechnology and Bioinformatics, Asia University, Taichung 41354, Taiwan
| | - Mallikarjuna Korivi
- Institute of Nutrition, College of Biopharmaceutical and Food Sciences, China Medical University, Taichung 40402, Taiwan
| | - Jian-You Pan
- Department of Biotechnology and Bioinformatics, Asia University, Taichung 41354, Taiwan
| | - Meng-Chang Hsieh
- Department of Biotechnology and Bioinformatics, Asia University, Taichung 41354, Taiwan
| | - Pei-Min Chao
- Institute of Nutrition, College of Biopharmaceutical and Food Sciences, China Medical University, Taichung 40402, Taiwan
| | - Pei-Jane Huang
- Department of Health and Nutrition Biotechnology, Asia University, Taichung 41354, Taiwan
| | - Ching-Tsan Tsai
- Institute of Public Health, China Medical University, Taichung 40402, Taiwan
| | - You-Cheng Hseu
- Department of Health and Nutrition Biotechnology, Asia University, Taichung 41354, Taiwan
- Department of Cosmeceutics, College of Biopharmaceutical and Food Sciences, China Medical University, Taichung 40402, Taiwan
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205
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Ye F, Zhao T, Liu X, Jin X, Liu X, Wang T, Li Q. Long-term Autophagy and Nrf2 Signaling in the Hippocampi of Developing Mice after Carbon Ion Exposure. Sci Rep 2015; 5:18636. [PMID: 26689155 PMCID: PMC4686898 DOI: 10.1038/srep18636] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2015] [Accepted: 11/20/2015] [Indexed: 12/29/2022] Open
Abstract
To explore charged particle radiation-induced long-term hippocampus damage, we investigated the expression of autophagy and antioxidant Nrf2 signaling-related proteins in the mouse hippocampus after carbon ion radiation. Heads of immature female Balb/c mice were irradiated with carbon ions of different LETs at various doses. Behavioral tests were performed on the mice after maturation. Acute and chronic expression of LC3-II, p62/SQSTM1, nuclear Nrf2, activated caspase-3 and the Bax/Bcl-2 ratio were measured in the hippocampi. Secondary X-ray insult was adopted to amplify potential damages. Long-term behavioral changes were observed in high-LET carbon ion-irradiated mice. There were no differences in the rates of LC3-II induction and p62/SQSTM1 degradation compared to the control group regardless of whether the mice received the secondary X-ray insult. A high nuclear Nrf2 content and low apoptosis level in hippocampal cells subjected to secondary X-rays were observed for the mice exposed to relatively low-LET carbon ions. Therefore, carbon ion exposure in the immature mouse led to an LET-dependent behavioral change after maturation. Although autophagy was intact, the persistently high nuclear Nrf2 content in the hippocampus might account for the unchanged behavioral pattern in mice exposed to the relatively low-LET carbon ions and the subsequent increased radioresistance of the hippocampus.
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Affiliation(s)
- Fei Ye
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China.,Department of Modern Physics, Lanzhou University, Lanzhou 730000, China.,University of Chinese Academy of Sciences, Beijing 100049, China.,Key Laboratory of Heavy Ion Radiation Biology and Medicine of Chinese Academy of Sciences, Lanzhou 730000, China
| | - Ting Zhao
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China.,Key Laboratory of Heavy Ion Radiation Biology and Medicine of Chinese Academy of Sciences, Lanzhou 730000, China
| | - Xiongxiong Liu
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China.,Key Laboratory of Heavy Ion Radiation Biology and Medicine of Chinese Academy of Sciences, Lanzhou 730000, China
| | - Xiaodong Jin
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China.,Key Laboratory of Heavy Ion Radiation Biology and Medicine of Chinese Academy of Sciences, Lanzhou 730000, China
| | - Xinguo Liu
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China.,Key Laboratory of Heavy Ion Radiation Biology and Medicine of Chinese Academy of Sciences, Lanzhou 730000, China
| | - Tieshan Wang
- Department of Modern Physics, Lanzhou University, Lanzhou 730000, China
| | - Qiang Li
- Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China.,Key Laboratory of Heavy Ion Radiation Biology and Medicine of Chinese Academy of Sciences, Lanzhou 730000, China
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206
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Joung EJ, Lee B, Gwon WG, Shin T, Jung BM, Yoon NY, Choi JS, Oh CW, Kim HR. Sargaquinoic acid attenuates inflammatory responses by regulating NF-κB and Nrf2 pathways in lipopolysaccharide-stimulated RAW 264.7 cells. Int Immunopharmacol 2015; 29:693-700. [PMID: 26442467 DOI: 10.1016/j.intimp.2015.09.007] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2015] [Revised: 08/17/2015] [Accepted: 09/10/2015] [Indexed: 10/22/2022]
Abstract
Myagropsis myagroides, a brown alga, showed strong anti-inflammatory activities in the previous studies. In this study, we isolated a strong anti-inflammatory compound, sargaquinoic acid (SQA), from M. myagroides and investigated the anti-inflammatory action using lipopolysaccharide (LPS)-stimulated RAW 264.7 cells. SQA suppressed the production of inducible nitric oxide synthase and cyclooxygenase-2 in LPS-stimulated cells as well as that of reactive oxygen species. As a result, SQA inhibited the production of NO, prostaglandin E2, and pro-inflammatory cytokines. LPS-induced transcriptional activation of nuclear factor-κB (NF-κB) was remarkably inhibited by SQA treatment through the prevention of inhibitor κB-α degradation. The regulation of NF-κB activation was also mediated by the phosphorylation of ERK and Akt in LPS-stimulated RAW 264.7 cells. Moreover, SQA induced the production of heme oxygenase 1 via activation of transcription factor Nrf2. These results indicate that SQA inhibits the LPS-induced expression of inflammatory mediators via suppression of ERK and Akt-mediated NF-κB pathway as well as up-regulation of Nrf2/HO-1 pathway, indicating that SQA has a potential therapeutic and preventive application in various inflammatory diseases.
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Affiliation(s)
- Eun-Ji Joung
- Department of Food Science and Nutrition, Pukyong National University, Busan 608-737, South Korea
| | - Bonggi Lee
- Department of Food Science and Nutrition, Pukyong National University, Busan 608-737, South Korea
| | - Wi-Gyeong Gwon
- Department of Food Science and Nutrition, Pukyong National University, Busan 608-737, South Korea
| | - Taisun Shin
- Division of Food and Nutrition, Chonnam National University, Gwangju 500-757, South Korea
| | - Bok-Mi Jung
- Division of Food and Nutrition, Chonnam National University, Gwangju 500-757, South Korea
| | - Na-Young Yoon
- Food and Safety Research Division, National Fisheries Research and Development Institute, Gijang-gun, Busan 619-705, South Korea
| | - Jae-Sue Choi
- Department of Food Science and Nutrition, Pukyong National University, Busan 608-737, South Korea
| | - Chul Woong Oh
- Department of Marine Biology, Pukyong National University, Busan 608-737, South Korea
| | - Hyeung-Rak Kim
- Department of Food Science and Nutrition, Pukyong National University, Busan 608-737, South Korea.
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207
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Cavaleri F. Review of Amyotrophic Lateral Sclerosis, Parkinson’s and Alzheimer’s diseases helps further define pathology of the novel paradigm for Alzheimer’s with heavy metals as primary disease cause. Med Hypotheses 2015; 85:779-90. [DOI: 10.1016/j.mehy.2015.10.009] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2015] [Revised: 09/25/2015] [Accepted: 10/11/2015] [Indexed: 01/07/2023]
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208
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de Oliveira MR, Ferreira GC, Schuck PF, Dal Bosco SM. Role for the PI3K/Akt/Nrf2 signaling pathway in the protective effects of carnosic acid against methylglyoxal-induced neurotoxicity in SH-SY5Y neuroblastoma cells. Chem Biol Interact 2015; 242:396-406. [DOI: 10.1016/j.cbi.2015.11.003] [Citation(s) in RCA: 86] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2015] [Revised: 08/07/2015] [Accepted: 11/04/2015] [Indexed: 02/07/2023]
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209
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Athar M, Lone MY, Khedkar VM, Jha PC. Pharmacophore model prediction, 3D-QSAR and molecular docking studies on vinyl sulfones targeting Nrf2-mediated gene transcription intended for anti-Parkinson drug design. J Biomol Struct Dyn 2015. [PMID: 26222438 DOI: 10.1080/07391102.2015.1077343] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Despite intense research efforts towards clinical and molecular causes of Parkinson disease (PD), the etiology of disease still remains unclear. However, recent studies have provided ample evidences that the oxidative stress is the key player that contributes a lot to dopaminergic (DAergic) neurodegeneration in brain. It is due to the discrepancy of antioxidant defence system of which nuclear factor erythroid 2-related factor 2 (Nrf2) signalling is of central contour. In the current study, potent heme oxygenase-1 agonists (Nrf2 signalling regulator), vinyl sulfones, were selected and an optimal pharmacophore model was brought forth which was examined using a decoy set by atom-based 3D-QSAR. The best four-feature model consists of two hydrogen bond acceptors and two aromatic rings, which has the highest correlation coefficient, R(2) = .71 and [Formula: see text] = .73 in QSAR. These ligands were further studied for molecular docking with Nrf2-keap protein to gain insight into the major binding motifs followed by analysing pharmacokinetic properties to evaluate their bioavailability dominance. From this study, it is concluded that vinyl sulfones could be ideal compounds for targeting Nrf2 pathway which in turn halt the PD progression. Hence, these can be considered as potential leads for drug development against the same.
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Affiliation(s)
- Mohd Athar
- a CCG@cug Lab, School of Chemical Sciences , Central University of Gujarat , Gandhinagar 382030 , Gujarat , India
| | - Mohsin Yousuf Lone
- a CCG@cug Lab, School of Chemical Sciences , Central University of Gujarat , Gandhinagar 382030 , Gujarat , India
| | - Vijay M Khedkar
- b School of Health Sciences, Discipline of Pharmaceutical Sciences , University of KwaZulu-Natal , Westville, Durban 4000 , South Africa
| | - Prakash Chandra Jha
- a CCG@cug Lab, School of Chemical Sciences , Central University of Gujarat , Gandhinagar 382030 , Gujarat , India
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210
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Townsend BE, Johnson RW. Sulforaphane induces Nrf2 target genes and attenuates inflammatory gene expression in microglia from brain of young adult and aged mice. Exp Gerontol 2015; 73:42-8. [PMID: 26571201 DOI: 10.1016/j.exger.2015.11.004] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2015] [Revised: 10/14/2015] [Accepted: 11/09/2015] [Indexed: 01/24/2023]
Abstract
Increased neuroinflammation and oxidative stress resulting from heightened microglial activation are associated with age-related cognitive impairment. The objectives of this study were to examine the effects of the bioactive sulforaphane (SFN) on the nuclear factor E2-related factor 2 (Nrf2) pathway in BV2 microglia and primary microglia, and to evaluate proinflammatory cytokine expression in lipopolysaccharide (LPS)-stimulated primary microglia from adult and aged mice. BV2 microglia and primary microglia isolated from young adult and aged mice were treated with SFN and LPS. Changes in Nrf2 activity, expression of Nrf2 target genes, and levels of proinflammatory markers were assessed by quantitative PCR and immunoassay. SFN increased Nrf2 DNA-binding activity and upregulated Nrf2 target genes in BV2 microglia, while reducing LPS-induced interleukin (IL-)1β, IL-6, and inducible nitric oxide synthase (iNOS). In primary microglia from adult and aged mice, SFN increased expression of Nrf2 target genes and attenuated IL-1β, IL-6, and iNOS induced by LPS. These data indicate that SFN is a potential beneficial supplement that may be useful for reducing microglial mediated neuroinflammation and oxidative stress associated with aging.
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Affiliation(s)
- Brigitte E Townsend
- Division of Nutritional Sciences, University of Illinois, 1201 West Gregory Drive, Urbana, IL 61801, USA
| | - Rodney W Johnson
- Division of Nutritional Sciences, University of Illinois, 1201 West Gregory Drive, Urbana, IL 61801, USA; Department of Animal Sciences, University of Illinois, 1201 West Gregory Drive, Urbana, IL 61801, USA.
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211
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Manifestations of oxidative stress and molecular damages in ovarian cancer tissue. UKRAINIAN BIOCHEMICAL JOURNAL 2015. [DOI: 10.15407/ubj87.05.093] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
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212
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Mechanisms of Neuronal Protection against Excitotoxicity, Endoplasmic Reticulum Stress, and Mitochondrial Dysfunction in Stroke and Neurodegenerative Diseases. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2015; 2015:964518. [PMID: 26576229 PMCID: PMC4630664 DOI: 10.1155/2015/964518] [Citation(s) in RCA: 177] [Impact Index Per Article: 19.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 01/07/2015] [Revised: 03/09/2015] [Accepted: 03/11/2015] [Indexed: 12/28/2022]
Abstract
In stroke and neurodegenerative disease, neuronal excitotoxicity, caused by increased extracellular glutamate levels, is known to result in calcium overload and mitochondrial dysfunction. Mitochondrial deficits may involve a deficiency in energy supply as well as generation of high levels of oxidants which are key contributors to neuronal cell death through necrotic and apoptotic mechanisms. Excessive glutamate receptor stimulation also results in increased nitric oxide generation which can be detrimental to cells as nitric oxide interacts with superoxide to form the toxic molecule peroxynitrite. High level oxidant production elicits neuronal apoptosis through the actions of proapoptotic Bcl-2 family members resulting in mitochondrial permeability transition pore opening. In addition to apoptotic responses to severe stress, accumulation of misfolded proteins and high levels of oxidants can elicit endoplasmic reticulum (ER) stress pathways which may also contribute to induction of apoptosis. Two categories of therapeutics are discussed that impact major pro-death events that include induction of oxidants, calcium overload, and ER stress. The first category of therapeutic agent includes the amino acid taurine which prevents calcium overload and is also capable of preventing ER stress by inhibiting specific ER stress pathways. The second category involves N-methyl-D-aspartate receptor (NMDA receptor) partial antagonists illustrated by S-Methyl-N, N-diethyldithiocarbamate sulfoxide (DETC-MeSO), and memantine. DETC-MeSO is protective through preventing excitotoxicity and calcium overload and by blocking specific ER stress pathways. Another NMDA receptor partial antagonist is memantine which prevents excessive glutamate excitation but also remarkably allows maintenance of physiological neurotransmission. Targeting of these major sites of neuronal damage using pharmacological agents is discussed in terms of potential therapeutic approaches for neurological disorders.
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213
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Kim GH, Kim JE, Rhie SJ, Yoon S. The Role of Oxidative Stress in Neurodegenerative Diseases. Exp Neurobiol 2015; 24:325-40. [PMID: 26713080 PMCID: PMC4688332 DOI: 10.5607/en.2015.24.4.325] [Citation(s) in RCA: 886] [Impact Index Per Article: 98.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2015] [Revised: 09/14/2015] [Accepted: 09/14/2015] [Indexed: 12/14/2022] Open
Abstract
Oxidative stress is induced by an imbalanced redox states, involving either excessive generation of reactive oxygen species (ROS) or dysfunction of the antioxidant system. The brain is one of organs especially vulnerable to the effects of ROS because of its high oxygen demand and its abundance of peroxidation-susceptible lipid cells. Previous studies have demonstrated that oxidative stress plays a central role in a common pathophysiology of neurodegenerative diseases such as Alzheimer's disease and Parkinson's disease. Antioxidant therapy has been suggested for the prevention and treatment of neurodegenerative diseases, although the results with regard to their efficacy of treating neurodegenerative disease have been inconsistent. In this review, we will discuss the role of oxidative stress in the pathophysiology of neurodegenerative diseases and in vivo measurement of an index of damage by oxidative stress. Moreover, the present knowledge on antioxidant in the treatment of neurodegenerative diseases and future directions will be outlined.
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Affiliation(s)
- Geon Ha Kim
- Ewha Brain Institute, Ewha Womans University, Seoul 03760, Korea. ; Department of Neurology, Ewha Womans University Mokdong Hospital, Ewha Womans University School of Medicine, Seoul 03760, Korea
| | - Jieun E Kim
- Ewha Brain Institute, Ewha Womans University, Seoul 03760, Korea. ; Department of Brain and Cognitive Sciences, Ewha Womans University, Seoul 03760, Korea
| | - Sandy Jeong Rhie
- Ewha Brain Institute, Ewha Womans University, Seoul 03760, Korea. ; College of Pharmacy, Graduate School of Pharmaceutical Sciences, Ewha Womans University, Seoul 03760, Korea
| | - Sujung Yoon
- Ewha Brain Institute, Ewha Womans University, Seoul 03760, Korea
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214
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Bell-Temin H, Culver-Cochran AE, Chaput D, Carlson CM, Kuehl M, Burkhardt BR, Bickford PC, Liu B, Stevens SM. Novel Molecular Insights into Classical and Alternative Activation States of Microglia as Revealed by Stable Isotope Labeling by Amino Acids in Cell Culture (SILAC)-based Proteomics. Mol Cell Proteomics 2015; 14:3173-84. [PMID: 26424600 PMCID: PMC4762627 DOI: 10.1074/mcp.m115.053926] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2015] [Indexed: 11/21/2022] Open
Abstract
Microglia, the resident immune cells of the brain, have been shown to display a complex spectrum of roles that span from neurotrophic to neurotoxic depending on their activation status. Microglia can be classified into four stages of activation, M1, which most closely matches the classical (pro-inflammatory) activation stage, and the alternative activation stages M2a, M2b, and M2c. The alternative activation stages have not yet been comprehensively analyzed through unbiased, global-scale protein expression profiling. In this study, BV2 mouse immortalized microglial cells were stimulated with agonists specific for each of the four stages and total protein expression for 4644 protein groups was quantified using SILAC-based proteomic analysis. After validating induction of the various stages through a targeted cytokine assay and Western blotting of activation states, the data revealed novel insights into the similarities and differences between the various states. The data identify several protein groups whose expression in the anti-inflammatory, pro-healing activation states are altered presumably to curtail inflammatory activation through differential protein expression, in the M2a state including CD74, LYN, SQST1, TLR2, and CD14. The differential expression of these proteins promotes healing, limits phagocytosis, and limits activation of reactive nitrogen species through toll-like receptor cascades. The M2c state appears to center around the down-regulation of a key member in the formation of actin-rich phagosomes, SLP-76. In addition, the proteomic data identified a novel activation marker, DAB2, which is involved in clathrin-mediated endocytosis and is significantly different between M2a and either M1 or M2b states. Western blot analysis of mouse primary microglia stimulated with the various agonists of the classical and alternative activation states revealed a similar trend of DAB2 expression compared with BV2 cells.
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Affiliation(s)
- Harris Bell-Temin
- From the ‡Department of Cell Biology, Microbiology, and Molecular Biology, University of South Florida, 4202 E. Fowler Ave, Tampa, Florida 33620
| | - Ashley E Culver-Cochran
- From the ‡Department of Cell Biology, Microbiology, and Molecular Biology, University of South Florida, 4202 E. Fowler Ave, Tampa, Florida 33620
| | - Dale Chaput
- From the ‡Department of Cell Biology, Microbiology, and Molecular Biology, University of South Florida, 4202 E. Fowler Ave, Tampa, Florida 33620
| | - Christina M Carlson
- From the ‡Department of Cell Biology, Microbiology, and Molecular Biology, University of South Florida, 4202 E. Fowler Ave, Tampa, Florida 33620
| | - Melanie Kuehl
- From the ‡Department of Cell Biology, Microbiology, and Molecular Biology, University of South Florida, 4202 E. Fowler Ave, Tampa, Florida 33620
| | - Brant R Burkhardt
- From the ‡Department of Cell Biology, Microbiology, and Molecular Biology, University of South Florida, 4202 E. Fowler Ave, Tampa, Florida 33620
| | - Paula C Bickford
- §James A. Haley VA Hospital, Research Service and Department of Neurosurgery and Brain Repair, University of South Florida, 12901 Bruce B. Downs Blvd, Tampa, Florida 33612
| | - Bin Liu
- ¶Department of Pharmacodynamics, University of Florida, 1345 Center Drive, Gainesville, Florida 32610
| | - Stanley M Stevens
- From the ‡Department of Cell Biology, Microbiology, and Molecular Biology, University of South Florida, 4202 E. Fowler Ave, Tampa, Florida 33620;
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Polotow TG, Poppe SC, Vardaris CV, Ganini D, Guariroba M, Mattei R, Hatanaka E, Martins MF, Bondan EF, Barros MP. Redox Status and Neuro Inflammation Indexes in Cerebellum and Motor Cortex of Wistar Rats Supplemented with Natural Sources of Omega-3 Fatty Acids and Astaxanthin: Fish Oil, Krill Oil, and Algal Biomass. Mar Drugs 2015; 13:6117-37. [PMID: 26426026 PMCID: PMC4626682 DOI: 10.3390/md13106117] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2015] [Revised: 09/14/2015] [Accepted: 09/16/2015] [Indexed: 12/15/2022] Open
Abstract
Health authorities worldwide have consistently recommended the regular consumption of marine fishes and seafood to preserve memory, sustain cognitive functions, and prevent neurodegenerative processes in humans. Shrimp, crabs, lobster, and salmon are of particular interest in the human diet due to their substantial provision of omega-3 fatty acids (n-3/PUFAs) and the antioxidant carotenoid astaxanthin (ASTA). However, the optimal ratio between these nutraceuticals in natural sources is apparently the key factor for maximum protection against most neuro-motor disorders. Therefore, we aimed here to investigate the effects of a long-term supplementation with (n-3)/PUFAs-rich fish oil, ASTA-rich algal biomass, the combination of them, or krill oil (a natural combination of both nutrients) on baseline redox balance and neuro-inflammation indexes in cerebellum and motor cortex of Wistar rats. Significant changes in redox metabolism were only observed upon ASTA supplementation, which reinforce its antioxidant properties with a putative mitochondrial-centered action in rat brain. Krill oil imposed mild astrocyte activation in motor cortex of Wistar rats, although no redox or inflammatory index was concomitantly altered. In summary, there is no experimental evidence that krill oil, fish oil, oralgal biomass (minor variation), drastically change the baseline oxidative conditions or the neuro-inflammatory scenario in neuromotor-associated rat brain regions.
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Affiliation(s)
- Tatiana G Polotow
- Postgraduate program in Health Sciences, Institute of Physical Activity and Sports Sciences (ICAFE), Cruzeiro do Sul University, R. Galvao Bueno, 868, Building B, 13th floor, Sao Paulo SP 01506000, Brazil.
| | - Sandra C Poppe
- Postgraduate program in Health Sciences, Institute of Physical Activity and Sports Sciences (ICAFE), Cruzeiro do Sul University, R. Galvao Bueno, 868, Building B, 13th floor, Sao Paulo SP 01506000, Brazil.
| | - Cristina V Vardaris
- Postgraduate program in Health Sciences, Institute of Physical Activity and Sports Sciences (ICAFE), Cruzeiro do Sul University, R. Galvao Bueno, 868, Building B, 13th floor, Sao Paulo SP 01506000, Brazil.
| | - Douglas Ganini
- Postgraduate program in Health Sciences, Institute of Physical Activity and Sports Sciences (ICAFE), Cruzeiro do Sul University, R. Galvao Bueno, 868, Building B, 13th floor, Sao Paulo SP 01506000, Brazil.
- Free Radical Metabolism Group, Laboratory of Toxicology and Pharmacology, National Institute of Environmental Health Sciences, NIEHS, Research Triangle Park, NC 27709, USA.
| | - Maísa Guariroba
- Postgraduate program in Health Sciences, Institute of Physical Activity and Sports Sciences (ICAFE), Cruzeiro do Sul University, R. Galvao Bueno, 868, Building B, 13th floor, Sao Paulo SP 01506000, Brazil.
| | - Rita Mattei
- Department of Psychobiology, Federal University of Sao Paulo (UNIFESP), Sao Paulo SP 04023062, Brazil.
| | - Elaine Hatanaka
- Postgraduate program in Health Sciences, Institute of Physical Activity and Sports Sciences (ICAFE), Cruzeiro do Sul University, R. Galvao Bueno, 868, Building B, 13th floor, Sao Paulo SP 01506000, Brazil.
| | - Maria F Martins
- Department of Environmental and Experimental Pathology, Paulista University (UNIP), Sao Paulo SP 04026002, Brazil.
- Program in Veterinary Medicine, Biological Sciences and Health (CBS), Cruzeiro do Sul University, Sao Paulo SP 01506-000, Brazil.
| | - Eduardo F Bondan
- Department of Environmental and Experimental Pathology, Paulista University (UNIP), Sao Paulo SP 04026002, Brazil.
- Program in Veterinary Medicine, Biological Sciences and Health (CBS), Cruzeiro do Sul University, Sao Paulo SP 01506-000, Brazil.
| | - Marcelo P Barros
- Postgraduate program in Health Sciences, Institute of Physical Activity and Sports Sciences (ICAFE), Cruzeiro do Sul University, R. Galvao Bueno, 868, Building B, 13th floor, Sao Paulo SP 01506000, Brazil.
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216
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Cai D, Yin S, Yang J, Jiang Q, Cao W. Histone deacetylase inhibition activates Nrf2 and protects against osteoarthritis. Arthritis Res Ther 2015; 17:269. [PMID: 26408027 PMCID: PMC4583998 DOI: 10.1186/s13075-015-0774-3] [Citation(s) in RCA: 117] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2015] [Accepted: 09/04/2015] [Indexed: 12/22/2022] Open
Abstract
Introduction Osteoarthritis (OA) is a common joint disease that can cause gradual disability among the aging population. Nuclear factor (erythroid-derived 2)-like 2 (Nrf2) is a key transcription factor that regulates the expression of phase II antioxidant enzymes that provide protection against oxidative stress and tissue damage. The use of histone deacetylase inhibitors (HDACi) has emerged as a potential therapeutic strategy for various diseases. They have displayed chondroprotective effects in various animal models of arthritis. Previous studies have established that Nrf2 acetylation enhances Nrf2 functions. Here we explore the role of Nrf2 in the development of OA and the involvement of Nrf2 acetylation in HDACi protection of OA. Methods Two OA models—monosodium iodoacetate (MIA) articular injection and destabilization of the medial meniscus (DMM)—were used with wild-type (WT) and Nrf2-knockout (Nrf2-KO) mice to demonstrate the role of Nrf2 in OA progression. A pan-HDACi, trichostatin A (TSA), was administered to examine the effectiveness of HDACi on protection from cartilage damage. The histological sections were scored. The expression of OA-associated matrix metalloproteinases (MMPs) 1, 3, and 13 and proinflammatory cytokines tumor necrosis factor (TNF)-α, interleukin (IL)-1β, and IL-6 were assayed. The effectiveness of HDACi on OA protection was compared between WT and Nrf2-KO mice. Results Nrf2-KO mice displayed more severe cartilage damage in both the MIA and DMM models. TSA promoted the induction of Nrf2 downstream proteins in SW1353 chondrosarcoma cells and in mouse joint tissues. TSA also reduced the expression of OA-associated proteins MMP1, MMP3, and MMP13 and proinflammatory cytokines TNF-α, IL-1β, and IL-6. TSA markedly reduced the cartilage damage in both OA models but offered no significant protection in Nrf2-KO mice. Conclusions Nrf2 has a major chondroprotective role in progression of OA and is a critical molecule in HDACi-mediated OA protection.
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Affiliation(s)
- Dawei Cai
- Jiangsu Key Laboratory of Molecular Medicine, Nanjing University School of Medicine, Nanjing, 210093, People's Republic of China. .,Center of Diagnosis and Treatment for Joint Disease, Nanjing Drum Tower Hospital Affiliated with Nanjing University School of Medicine, Nanjing, 210008, People's Republic of China.
| | - Shasha Yin
- Jiangsu Key Laboratory of Molecular Medicine, Nanjing University School of Medicine, Nanjing, 210093, People's Republic of China.
| | - Jun Yang
- Jiangsu Key Laboratory of Molecular Medicine, Nanjing University School of Medicine, Nanjing, 210093, People's Republic of China.
| | - Qing Jiang
- Jiangsu Key Laboratory of Molecular Medicine, Nanjing University School of Medicine, Nanjing, 210093, People's Republic of China. .,Center of Diagnosis and Treatment for Joint Disease, Nanjing Drum Tower Hospital Affiliated with Nanjing University School of Medicine, Nanjing, 210008, People's Republic of China. .,Model Animal Research Center of Nanjing University, Nanjing, 210032, People's Republic of China.
| | - Wangsen Cao
- Jiangsu Key Laboratory of Molecular Medicine, Nanjing University School of Medicine, Nanjing, 210093, People's Republic of China. .,National Clinical Research Center of Kidney Diseases, Jinling Hospital, Nanjing University School of Medicine, Nanjing, 210016, People's Republic of China.
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217
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Xiao Q, Yang YA, Zhao XY, He LS, Qin Y, He YH, Zhang GP, Luo JD. Oxidative stress contributes to the impaired sonic hedgehog pathway in type 1 diabetic mice with myocardial infarction. Exp Ther Med 2015; 10:1750-1758. [PMID: 26640546 PMCID: PMC4665878 DOI: 10.3892/etm.2015.2766] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2014] [Accepted: 08/08/2015] [Indexed: 12/19/2022] Open
Abstract
Our previous study demonstrated that an impaired sonic hedgehog (Shh) pathway contributed to cardiac dysfunction in type 1 diabetic mice with myocardial infarction (MI). The present study aimed to test the hypothesis that oxidative stress may contribute to the impaired Shh pathway and cardiac dysfunction in type 1 diabetic mice with MI. Streptozotocin-induced type 1 diabetic mice (C57/Bl6, male) and rat neonatal cardiomyocytes were used in the present study. Mice were randomly assigned to undergo ligation of the coronary artery or pseudosurgery. A potent antioxidant Tempol was administered in vivo and in vitro. Cardiac function was assessed by echocardiography, capillary density by immunohistochemisty, percentage of myocardial infarct using Massons trichrome staining, reactive oxygen species detection using dihydroethidium dye or 2,7-dichlorofluorescein diacetate probe and protein expression levels of the Shh pathway by western blot analysis. The antioxidant Tempol was shown to significantly increase myocardial protein expression levels of Shh and patched-1 (Ptc1) at 7–18 weeks and improved cardiac function at 18 weeks in type 1 diabetic mice, as compared with mice receiving no drug treatment. Furthermore, myocardial protein expression levels of Shh and Ptc1 were significantly upregulated on day 7 after MI, and capillary density was enhanced. In addition, the percentage area of myocardial infarct was reduced, and the cardiac dysfunction and survival rate were improved on day 21 in diabetic mice treated with Tempol. In vitro, treatment of rat neonatal cardiomyocytes with a mixture of xanthine oxidase and xanthine decreased protein expression levels of Shh and Ptc1 in a concentration-dependent manner, and Tempol attenuated this effect. These results indicate that oxidative stress may contribute to an impaired Shh pathway in type 1 diabetic mice, leading to diminished myocardial healing and cardiac dysfunction. Antioxidative strategies aimed at restoring the endogenous Shh pathway may offer a useful means for improving diabetic cardiac function.
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Affiliation(s)
- Qing Xiao
- Department of Pharmacology, Guangzhou Medical University, Guangzhou, Guangdong 510182, P.R. China ; Guangzhou Institute of Cardiovascular Disease, Guangzhou Key Laboratory of Cardiovascular Disease, Second Affiliated Hospital, Guangzhou Medical University, Guangzhou, Guangdong 510260, P.R. China
| | - Y A Yang
- Department of Pharmacology, Guangzhou Medical University, Guangzhou, Guangdong 510182, P.R. China
| | - Xiao-Ya Zhao
- Department of Pharmacology, Guangzhou Medical University, Guangzhou, Guangdong 510182, P.R. China
| | - Li-Shan He
- Department of Pharmacology, Guangzhou Medical University, Guangzhou, Guangdong 510182, P.R. China
| | - Yuan Qin
- Guangzhou Research Institute of Snake Venom, Guangzhou Medical University, Guangzhou, Guangdong 510182, P.R. China
| | - Yan-Hua He
- Guangzhou Research Institute of Snake Venom, Guangzhou Medical University, Guangzhou, Guangdong 510182, P.R. China
| | - Gui-Ping Zhang
- Department of Pharmacology, Guangzhou Medical University, Guangzhou, Guangdong 510182, P.R. China
| | - Jian-Dong Luo
- Department of Pharmacology, Guangzhou Medical University, Guangzhou, Guangdong 510182, P.R. China ; Guangzhou Institute of Cardiovascular Disease, Guangzhou Key Laboratory of Cardiovascular Disease, Second Affiliated Hospital, Guangzhou Medical University, Guangzhou, Guangdong 510260, P.R. China
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218
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Park JH, Choi JW, Ju EJ, Pae AN, Park KD. Antioxidant and Anti-Inflammatory Activities of a Natural Compound, Shizukahenriol, through Nrf2 Activation. Molecules 2015; 20:15989-6003. [PMID: 26364630 PMCID: PMC6332350 DOI: 10.3390/molecules200915989] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2015] [Revised: 08/18/2015] [Accepted: 08/28/2015] [Indexed: 11/21/2022] Open
Abstract
Imbalance in the antioxidant defense system leads to detrimental consequences, such as neurological disorders. The Nrf2 signaling is known as a main pathway involved in cellular defense system. Nrf2 is a transcription factor that regulates oxidative stress response by inducing expression of various antioxidant enzyme genes. In this study, we screened several pure natural compounds for Nrf2 activator. Among them, shizukahenriol (SZH), isolated from Chloranthus henryi, activated Nrf2, and induced expression of the Nrf2-dependent antioxidant enzymes HO-1, GCLC, and GCLM in BV-2 microglial cells. This natural compound was also effective in suppressing production of inflammatory molecules NO, TNF-α, and inhibition of NF-κB p65 translocation to the nucleus in a dose-dependent manner. We also examined whether SZH rescued the microglial cells from oxidative stress-induced cell death. Pretreatment with SZH dose-dependently attenuated H2O2-induced cytotoxicity in BV-2 microglial cells. These results suggested SZH as a potential neuroprotective agent for neurological disorders.
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Affiliation(s)
- Jong-Hyun Park
- Center for Neuro-Medicine, Korea Institute of Science and Technology, Seoul 136-791, Korea.
| | - Ji Won Choi
- Center for Neuro-Medicine, Korea Institute of Science and Technology, Seoul 136-791, Korea.
- Department of Biotechnology, Yonsei University, Seoul 120-749, Korea.
| | - Eun Ji Ju
- Center for Neuro-Medicine, Korea Institute of Science and Technology, Seoul 136-791, Korea.
- Department of Biotechnology, Yonsei University, Seoul 120-749, Korea.
| | - Ae Nim Pae
- Center for Neuro-Medicine, Korea Institute of Science and Technology, Seoul 136-791, Korea.
- Department of Biological Chemistry, University of Science and Technology, Daejeon 305-350, Korea.
| | - Ki Duk Park
- Center for Neuro-Medicine, Korea Institute of Science and Technology, Seoul 136-791, Korea.
- Department of Biological Chemistry, University of Science and Technology, Daejeon 305-350, Korea.
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Neuroprotective efficacy of naringin on 3-nitropropionic acid-induced mitochondrial dysfunction through the modulation of Nrf2 signaling pathway in PC12 cells. Mol Cell Biochem 2015; 409:199-211. [PMID: 26280522 DOI: 10.1007/s11010-015-2525-9] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2015] [Accepted: 08/06/2015] [Indexed: 12/12/2022]
Abstract
Oxidative stress and mitochondrial dysfunction are implicated in neuronal apoptosis associated with Huntington's disease. Naringin is the flavanone present in grapefruit and related citrus species possess diverse pharmacological and therapeutic properties including antioxidant, anti-apoptotic, and neuroprotective properties. The aim of this study was to investigate the protective effect of naringin on 3-nitropropionic acid (3-NP)-induced neurotoxicity in pheochromocytoma cells (PC12) cells and to explore its mechanism of action. Naringin protects PC12 cells from 3-NP neurotoxicity, as evaluated the by cell viability assays. The lactate dehydrogenase release was decreased upon naringin treatment in 3-NP-induced PC12 cells. Naringin treatment enhances the antioxidant defense by increasing the activities of enzymatic antioxidants and the level of reduced glutathione. The increase in levels of reactive oxygen species and lipid peroxidation induced by 3-NP were significantly decreased by naringin. PC12 cells induced with 3-NP showed decrease in the mitochondrial membrane potential and mitochondrial respiratory complex enzymes, succinate dehydrogenase and cytochrome c oxidase activities, and it was significantly altered to near normal upon naringin treatment. Naringin reduced the 3-NP-induced apoptosis through the modulation in expressions of B-cell lymphoma 2 and Bcl-2-associated X protein. Further, naringin enhances the nuclear translocation of Nrf2 and induces the NAD(P)H quinone oxidoreductase-1 and Heme oxygenase-1 expressions through the phosphatidylinositol-3-kinase (PI3K)/Akt signaling pathway. Taken together, the above findings suggest that naringin augments cellular antioxidant defense capacity and reduces the 3-NP-induced neurotoxicity in PC12 cells through the PI-3K/Akt-dependent Nrf2 activation in PC12 cells.
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220
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Peng S, Yao J, Liu Y, Duan D, Zhang X, Fang J. Activation of Nrf2 target enzymes conferring protection against oxidative stress in PC12 cells by ginger principal constituent 6-shogaol. Food Funct 2015; 6:2813-23. [PMID: 26169810 DOI: 10.1039/c5fo00214a] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2023]
Abstract
Natural compounds containing phenoxyl groups and/or Michael acceptor units appear to possess antioxidant and cytoprotective properties. The ginger principal constituent 6-shogaol (6-S) represents one of such compounds. In this study, we reported that 6-S efficiently scavenges various free radicals in vitro, and displays remarkable cytoprotection against oxidative stress-induced cell damage in the neuron-like rat pheochromocytoma cell line, PC12 cells. Pretreatment of PC12 cells with 6-S significantly upregulates a series of phase II antioxidant molecules, such as glutathione, heme oxygenase 1, NAD(P)H: quinone oxidoreductase 1, thioredoxin reductase 1, and thioredoxin 1. A mechanistic study revealed that 6-S enhanced the translocation of Nrf2 from the cytosol to the nucleus and knockdown of Nrf2 abolished such protection, indicating that this cytoprotection is mediated by the activation of the transcription factor Nrf2. Another ginger constituent 6-gingerol (6-G), having a similar structure of 6-S but lacking the alpha,beta-unsaturated ketone structure (Michael acceptor moiety), failed to shelter PC12 cells from oxidative stress. Our results demonstrate that 6-S is a novel small molecule activator of Nrf2 in PC12 cells, and suggest that 6-S might be a potential candidate for the prevention of oxidative stress-mediated neurodegenerative disorders.
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Affiliation(s)
- Shoujiao Peng
- State Key Laboratory of Applied Organic Chemistry and College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, Gansu 730000, China.
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221
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Cell type-specific Nrf2 expression in multiple sclerosis lesions. Acta Neuropathol 2015; 130:263-77. [PMID: 26087903 PMCID: PMC4503875 DOI: 10.1007/s00401-015-1452-x] [Citation(s) in RCA: 64] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2015] [Revised: 06/10/2015] [Accepted: 06/10/2015] [Indexed: 12/17/2022]
Abstract
Oxidative injury appears to play a major role in the propagation of demyelination and neurodegeneration in multiple sclerosis (MS). It has been suggested that endogenous anti-oxidant defense mechanisms within MS lesions are insufficient to prevent spreading of damage. Thus, current therapeutic approaches (e.g., fumarate treatment) target to up-regulate the expression of a key regulator of anti-oxidative defense, the transcription factor nuclear factor (erythroid-derived 2)-like 2 (Nrf2). In this study, we show that Nrf2 is already strongly up-regulated in active MS lesions. Nuclear Nrf2 expression was particularly observed in oligodendrocytes and its functional activity is indicated by the expression of one of its downstream targets (heme oxygenase 1) in the same cells. In contrast, only a minor number of Nrf2-positive neurons were detected, even in highly inflammatory cortical lesions presenting with extensive oxidative injury. Overall, the most pronounced Nrf2 expression was found in degenerating cells, which showed signs of apoptotic or necrotic cell death. Via whole-genome microarray analyses of MS lesions, we observed a differential expression of numerous Nrf2-responsive genes, also involved in the defense against oxidative stress, predominantly in areas of initial myelin destruction within actively demyelinating white matter lesions. Furthermore, the expression patterns of Nrf2-induced genes differed between the white matter and cortical gray matter. Our study shows that in the MS brain, Nrf2 expression varies in different cell types and is associated with active demyelination in the lesions.
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Colín-González AL, Becerríl H, Flores-Reyes BR, Torres I, Pinzón E, Angel DSD, Túnez I, Serratos I, Pedraza-Chaverrí J, Santamaría A, Maldonado PD. Acute restraint stress reduces hippocampal oxidative damage and behavior in rats: Effect of S-allyl cysteine. Life Sci 2015; 135:165-72. [DOI: 10.1016/j.lfs.2015.06.009] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2015] [Revised: 05/14/2015] [Accepted: 06/12/2015] [Indexed: 01/22/2023]
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Abstract
Huntington disease (HD) represents a family of neurodegenerative diseases that are caused by misfolded proteins. The misfolded proteins accumulate in the affected brain regions in an age-dependent manner to cause late-onset neurodegeneration. Transgenic mouse models expressing the HD protein, huntingtin, have been widely used to identify therapeutics that may retard disease progression. Here we report that Berberine (BBR), an organic small molecule isolated from plants, has protective effects on transgenic HD (N171-82Q) mice. We found that BBR can reduce the accumulation of mutant huntingtin in cultured cells. More importantly, when given orally, BBR could effectively alleviate motor dysfunction and prolong the survival of transgenic N171-82Q HD mice. We found that BBR could promote the degradation of mutant huntingtin by enhancing autophagic function. Since BBR is an orally-taken drug that has been safely used to treat a number of diseases, our findings suggest that BBR can be tested on different HD animal models and HD patients to further evaluate its therapeutic effects.
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Affiliation(s)
- Wenxiao Jiang
- Department of Human Genetics, Emory University School of Medicine, 615 Michael Street, Atlanta, GA 30322, United States of America
- Graduate Program of Microbiology and Molecular Genetics, Emory University, Atlanta, GA 30322, United States of America
| | - Wenjie Wei
- Department of Human Genetics, Emory University School of Medicine, 615 Michael Street, Atlanta, GA 30322, United States of America
- Department of Neurology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430032, China
| | - Marta A. Gaertig
- Department of Human Genetics, Emory University School of Medicine, 615 Michael Street, Atlanta, GA 30322, United States of America
| | - Shihua Li
- Department of Human Genetics, Emory University School of Medicine, 615 Michael Street, Atlanta, GA 30322, United States of America
| | - Xiao-Jiang Li
- Department of Human Genetics, Emory University School of Medicine, 615 Michael Street, Atlanta, GA 30322, United States of America
- * E-mail:
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Wen X, Huang A, Hu J, Zhong Z, Liu Y, Li Z, Pan X, Liu Z. Neuroprotective effect of astaxanthin against glutamate-induced cytotoxicity in HT22 cells: Involvement of the Akt/GSK-3β pathway. Neuroscience 2015. [PMID: 26197224 DOI: 10.1016/j.neuroscience.2015.07.034] [Citation(s) in RCA: 66] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Oxidative stress (OS) mediated the pathogenesis of Alzheimer's disease (AD). Astaxanthin (ATX) has been reported to exert antioxidant activities as well as neuroprotective effects in vivo and in vitro. But it is still unknown whether the Akt/glycogen synthase kinase-3β (GSK-3β) signaling mediated the neuroprotective effect of ATX in HT22 cells. Flow cytometric analysis was used to evaluate reactive oxygen species (ROS) generation. Caspase and PARP activity was measured. The expressions of heme oxygenase-1 (HO-1), nuclear factor-E2-related factor 2 (Nrf2), Bcl-2, Bax, apoptosis-inducing factor (AIF), cytochrome-c (Cyto-c), p-Akt and p-GSK-3β were evaluated to elucidate the underlying mechanism. Our results showed that ATX significantly attenuated glutamate-induced cell viability loss and lactate dehydrogenase (LDH) release, decreased the expression of caspase-3/8/9 activity and cleaved PARP, and suppressed the intracellular accumulation of ROS in HT22 cells after exposure to glutamate. ATX also increased the mitochondrial expression of AIF, Cyto-c as well as Bax while decreased Bcl-2. Moreover, ATX also induced the HO-1 expression in a dose and time-dependent manner, increased the antioxidant-responsive element (ARE) activity and nuclear Nrf2 expression. Furthermore, treatment with ATX restored the p-Akt and p-GSK-3β (Ser9) as well as HO-1 expression reduced by glutamate. This protective effect was partially blocked by the inhibitors lithium chloride treatment in HT22, indicating the involvement of Akt/GSK-3β inactivation during the neuroprotective effect of ATX. Our results provide the first evidence that ATX can protect glutamate-induced cytotoxicity in HT22 via attenuating caspase activation and mitochondrial dysfunction and modulating the Akt/GSK-3β signaling, indicating ATX may be useful for the treatment of neurodegenerative disorders such as AD.
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Affiliation(s)
- X Wen
- Department of Neurology, Guangzhou First Municipal People's Hospital, Guangzhou Medical University, Guangzhou-Birmingham University Brain and Cognition Center, No. 1 Panfu Road, Guangzhou 510180, China
| | - A Huang
- State Key Laboratory of Oncology in Southern China, Sun Yat-Sen University Cancer Center, Guangzhou 510060, China
| | - J Hu
- Department of Neurology, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou 510120, China
| | - Z Zhong
- Department of Neurology, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou 510120, China
| | - Y Liu
- Department of Neurology, the Sixth Affiliated Hospital Sun Yat-sen University, Guangzhou 510440, China
| | - Z Li
- Department of Neurology, Guangzhou First Municipal People's Hospital, Guangzhou Medical University, Guangzhou-Birmingham University Brain and Cognition Center, No. 1 Panfu Road, Guangzhou 510180, China
| | - X Pan
- Department of Neurology, Guangzhou First Municipal People's Hospital, Guangzhou Medical University, Guangzhou-Birmingham University Brain and Cognition Center, No. 1 Panfu Road, Guangzhou 510180, China.
| | - Z Liu
- Department of Neurology, Sun Yat-Sen Memorial Hospital, Sun Yat-Sen University, Guangzhou 510120, China; Guangdong Provincial Key Laboratory of Malignant Tumor Epigenetics and Gene Regulation, China.
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225
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Herbal formula, Scutellariae radix and Rhei rhizoma attenuate dimethylnitrosamine-induced liver fibrosis in a rat model. Sci Rep 2015; 5:11734. [PMID: 26133262 PMCID: PMC4488958 DOI: 10.1038/srep11734] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2014] [Accepted: 05/29/2015] [Indexed: 01/09/2023] Open
Abstract
The bioactive components extracted from Scutellariae radix and Rhei rhizoma (SR) have been commonly used to treat liver diseases. The aim of this study was to verify the underlying mechanisms and antifibrotic effects of ethanol extract from the herbal combinatorial formula (SRE) in a dimethylnitrosamine (DMN)-administered rat model, with functional proteome tools. Our results indicated that the hepatic collagen content and alpha-smooth muscle actin expression were obviously alleviated by treatment with SRE. Comprehensive proteomics revealed global protein changes, and the network analysis implied that SRE application would attenuate oxidative stress and cytoskeleton dysregulation caused by DMN exposure. Next, marked downregulation of antioxidant enzymes mediated by DMN treatment was restored in the presence of SRE, while SRE treatment contributed to decreased MDA content. Moreover, protein carbonylation and DNA adduction induced by oxidative stress finally leading to liver injury were also reduced under SRE administration. These findings demonstrate that SRE could effectively prevent hepatic fibrosis mainly through regulating the redox status, and subsequently modulating the modification of intracellular molecules. Our experiments might help in developing novel therapeutic strategies against oxidation-caused liver diseases.
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226
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Abed DA, Goldstein M, Albanyan H, Jin H, Hu L. Discovery of direct inhibitors of Keap1-Nrf2 protein-protein interaction as potential therapeutic and preventive agents. Acta Pharm Sin B 2015; 5:285-99. [PMID: 26579458 PMCID: PMC4629420 DOI: 10.1016/j.apsb.2015.05.008] [Citation(s) in RCA: 217] [Impact Index Per Article: 24.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2015] [Accepted: 05/11/2015] [Indexed: 02/07/2023] Open
Abstract
The Keap1–Nrf2–ARE pathway is an important antioxidant defense mechanism that protects cells from oxidative stress and the Keap1–Nrf2 protein–protein interaction (PPI) has become an important drug target to upregulate the expression of ARE-controlled cytoprotective oxidative stress response enzymes in the development of therapeutic and preventive agents for a number of diseases and conditions. However, most known Nrf2 activators/ARE inducers are indirect inhibitors of Keap1–Nrf2 PPI and they are electrophilic species that act by modifying the sulfhydryl groups of Keap1׳s cysteine residues. The electrophilicity of these indirect inhibitors may cause "off-target" side effects by reacting with cysteine residues of other important cellular proteins. Efforts have recently been focused on the development of direct inhibitors of Keap1–Nrf2 PPI. This article reviews these recent research efforts including the development of high throughput screening assays, the discovery of peptide and small molecule direct inhibitors, and the biophysical characterization of the binding of these inhibitors to the target Keap1 Kelch domain protein. These non-covalent direct inhibitors of Keap1–Nrf2 PPI could potentially be developed into effective therapeutic or preventive agents for a variety of diseases and conditions.
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Key Words
- 1O2, singlet oxygen
- AD, Alzheimer׳s disease
- ARE, antioxidant response element
- BTB, broad complex, tramtrack and bric-a-brac
- Bach1, BTB and CNC homology 1
- CBP, cAMP response element binding (CREB) protein
- CDDO-Me, bardoxolone methyl
- COPD, chronic obstructive pulmonary disease
- CTR, C-terminal region
- CVD, cardiovascular disease
- DGR, double glycine repeats
- Direct inhibitors of protein–protein interaction
- FITC, flurescein isothiocyanate
- FP, fluorescence polarization
- GCL, glutamate-cysteine ligase
- GPx, glutathione peroxidase
- GST, glutathione S-transferase
- H2O2, hydrogen peroxide
- HO-1, heme-oxygenase-1
- HTS, high-throughput screening
- High throughput screening assays
- IBS, inflammatory bowel disease
- IVR, intervening region
- Keap1
- Keap1, Kelch-like ECH-associated protein 1
- MD, molecular dynamics
- NMR, .
- NO, nitric oxide
- NQO1, NAD(P)H quinone oxidoreductase I
- NTR, N-terminal region
- Nrf2
- Nrf2, nuclear factor erythroid 2–related factor 2
- Oxidative stress
- PD, Parkinson׳s disease
- PPI, protein–protein interaction
- RNS, reactive nitrogen species
- ROS, reactive oxygen species
- SOD, superoxide dismutase
- SPR, surface plasmon resonance
- STZ, streptozotocin
- Structure–activity relationships
- THIQ, tetrahydroisoquinoline
- TRX, thioredoxin
- X-ray crystallography
- [Formula: see text], peroxynitrate
- [Formula: see text], superoxide, OH·, hydroxyl radical
- vitamin C, ascorbate
- vitamin E, tocopherols
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Wu W, Li Y, Wu Y, Zhang Y, Wang Z, Liu X. Lutein suppresses inflammatory responses through Nrf2 activation and NF-κB inactivation in lipopolysaccharide-stimulated BV-2 microglia. Mol Nutr Food Res 2015; 59:1663-73. [PMID: 26016441 DOI: 10.1002/mnfr.201500109] [Citation(s) in RCA: 76] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2015] [Revised: 05/09/2015] [Accepted: 05/13/2015] [Indexed: 12/19/2022]
Abstract
SCOPE In this study, the effects of lutein on neuroinflammation in lipopolysaccharide (LPS)-activated BV-2 microglia were investigated. METHODS AND RESULTS The production of proinflammatory cytokines tumor necrosis factor-α, interleukin-1β, and nitric oxide was measured in culture medium using enzyme immunoassay and Griess reagent, respectively. The expression of proteins was determined using Western blot. Pretreatment with lutein (50 μM) prior to LPS (1 μg/mL, 12 h) stimulation resulted in a significant inhibition of inducible nitric oxide synthase and cyclooxygenase-2 expression, as well as tumor necrosis factor-α, interleukin-1β, and nitric oxide production (p < 0.05). Further experiments demonstrated that lutein suppressed LPS-induced NF-κB activation by inhibiting the phosphorylation of p38 kinase, c-Jun N-terminal kinase (JNK), and Akt kinase (p < 0.05). Moreover, lutein markedly quenched reactive oxygen species and promoted antioxidant protein expression including heme oxygenase-1 and NAD(P)H quinone oxidoreductase by enhancing the phosphorylation of extracellular signal-regulated kinase 1/2 (ERK1/2) mediated NF-E2-related factor 2 (Nrf2) activation (p < 0.05). CONCLUSION These results suggest that lutein attenuates neuroinflammation in LPS-activated BV-2 microglia partly through inhibiting p38-, JNK-, and Akt-stimulated NF-κB activation and promoting ERK-induced Nrf2 activation, suggesting that lutein has great potential as a nutritional preventive strategy in inflammation-related neurodegenerative disorders.
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Affiliation(s)
- Wanqiang Wu
- College of Food Science and Engineering, Northwest A&F University, Yangling, China
| | - Yuelian Li
- College of Food Science and Engineering, Northwest A&F University, Yangling, China
| | - Yue Wu
- College of Food Science and Engineering, Northwest A&F University, Yangling, China
| | - Yawen Zhang
- College of Food Science and Engineering, Northwest A&F University, Yangling, China
| | - Zhen Wang
- College of Food Science and Engineering, Northwest A&F University, Yangling, China
| | - Xuebo Liu
- College of Food Science and Engineering, Northwest A&F University, Yangling, China
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228
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Su C, Xia X, Shi Q, Song X, Fu J, Xiao C, Chen H, Lu B, Sun Z, Wu S, Yang S, Li X, Ye X, Song E, Song Y. Neohesperidin Dihydrochalcone versus CCl₄-Induced Hepatic Injury through Different Mechanisms: The Implication of Free Radical Scavenging and Nrf2 Activation. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2015; 63:5468-5475. [PMID: 25978654 DOI: 10.1021/acs.jafc.5b01750] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Neohesperidin dihydrochalcone (NHDC), a sweetener derived from citrus, belongs to the family of bycyclic flavonoids dihydrochalcones. NHDC has been reported to act against CCl4-induced hepatic injury, but its mechanism is still unclear. We first discovered that NHDC showed a strong ability to scavenge free radicals. In addition, NHDC induces the phase II antioxidant enzymes heme oxygenase 1 (HO-1) and NAD(P)H/quinone oxidoreductase 1 (NQO1) through the activation of the nuclear factor (erythroid-derived 2)-like 2 (Nrf2)/antioxidant response element (ARE) signaling. Further assays demonstrated that NHDC induces accumulation of Nrf2 in the nucleus and augmented Nrf2-ARE binding activity. Moreover, NHDC inhibits the ubiquitination of Nrf2 and suggests the modification of Kelch-like ECH-associated protein 1 (Keap1) and the disruption of the Keap1/Nrf2 complex. c-Jun N-terminal kinase (JNK) and p38 but not extracellular signal-regulated protein kinase (ERK) phosphorylations were up-regulated by NHDC treatment. Taken together, NHDC showed its protective antioxidant effect against CCl4-induced oxidative damage via the direct free radical scavenging and indirect Nrf2/ARE signaling pathway.
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Affiliation(s)
- Chuanyang Su
- †Key Laboratory of Luminescence and Real-Time Analytical Chemistry (Southwest University), Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing, People's Republic of China, 400715
| | - Xiaomin Xia
- †Key Laboratory of Luminescence and Real-Time Analytical Chemistry (Southwest University), Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing, People's Republic of China, 400715
| | - Qiong Shi
- †Key Laboratory of Luminescence and Real-Time Analytical Chemistry (Southwest University), Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing, People's Republic of China, 400715
| | - Xiufang Song
- †Key Laboratory of Luminescence and Real-Time Analytical Chemistry (Southwest University), Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing, People's Republic of China, 400715
| | - Juanli Fu
- †Key Laboratory of Luminescence and Real-Time Analytical Chemistry (Southwest University), Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing, People's Republic of China, 400715
| | - Congxue Xiao
- †Key Laboratory of Luminescence and Real-Time Analytical Chemistry (Southwest University), Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing, People's Republic of China, 400715
| | - Hongjun Chen
- †Key Laboratory of Luminescence and Real-Time Analytical Chemistry (Southwest University), Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing, People's Republic of China, 400715
| | - Bin Lu
- †Key Laboratory of Luminescence and Real-Time Analytical Chemistry (Southwest University), Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing, People's Republic of China, 400715
| | - Zhiyin Sun
- †Key Laboratory of Luminescence and Real-Time Analytical Chemistry (Southwest University), Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing, People's Republic of China, 400715
| | - Shanmei Wu
- †Key Laboratory of Luminescence and Real-Time Analytical Chemistry (Southwest University), Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing, People's Republic of China, 400715
| | - Siyu Yang
- †Key Laboratory of Luminescence and Real-Time Analytical Chemistry (Southwest University), Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing, People's Republic of China, 400715
| | - Xuegang Li
- †Key Laboratory of Luminescence and Real-Time Analytical Chemistry (Southwest University), Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing, People's Republic of China, 400715
| | - Xiaoli Ye
- ‡College of Life Sciences, Southwest University, Chongqing, People's Republic of China, 400715
| | - Erqun Song
- †Key Laboratory of Luminescence and Real-Time Analytical Chemistry (Southwest University), Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing, People's Republic of China, 400715
| | - Yang Song
- †Key Laboratory of Luminescence and Real-Time Analytical Chemistry (Southwest University), Ministry of Education, College of Pharmaceutical Sciences, Southwest University, Chongqing, People's Republic of China, 400715
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Therapeutic potential of berberine against neurodegenerative diseases. SCIENCE CHINA-LIFE SCIENCES 2015; 58:564-9. [PMID: 25749423 PMCID: PMC5823536 DOI: 10.1007/s11427-015-4829-0] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/21/2014] [Accepted: 12/16/2014] [Indexed: 12/25/2022]
Abstract
Berberine (BBR) is an organic small molecule isolated from various plants that have been used in traditional Chinese medicine. Isolation of this compound was its induction into modern medicine, and its usefulness became quickly apparent as seen in its ability to combat bacterial diarrhea, type 2 diabetes, hypercholesterolemia, inflammation, heart diseases, and more. However, BBR’s effects on neurodegenerative diseases remained relatively unexplored until its ability to stunt Alzheimer’s disease (AD) progression was characterized. In this review, we will delve into the multi-faceted defensive capabilities and bio-molecular pathways of BBR against AD, Parkinson’s disease (PD), and trauma-induced neurodegeneration. The multiple effects of BBR, some of which enhance neuro-protective factors/pathways and others counteract targets that induce neurodegeneration, suggest that there are many more branches to the diverse capabilities of BBR that have yet to be uncovered. The promising results seen provide a convincing and substantial basis to support further scientific exploration and development of the therapeutic potential of BBR against neurodegenerative diseases.
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230
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Djordjevic J, Djordjevic A, Adzic M, Mitic M, Lukic I, Radojcic MB. Alterations in the Nrf2–Keap1 signaling pathway and its downstream target genes in rat brain under stress. Brain Res 2015; 1602:20-31. [DOI: 10.1016/j.brainres.2015.01.010] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2014] [Revised: 01/06/2015] [Accepted: 01/07/2015] [Indexed: 12/21/2022]
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231
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Cavaleri F. Paradigm shift redefining molecular, metabolic and structural events in Alzheimer's disease involves a proposed contribution by transition metals. Defined lengthy preclinical stage provides new hope to circumvent advancement of disease- and age-related neurodegeneration. Med Hypotheses 2015; 84:460-9. [PMID: 25691377 DOI: 10.1016/j.mehy.2015.01.044] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2014] [Accepted: 01/30/2015] [Indexed: 12/28/2022]
Abstract
It is estimated that 5.5 Million North Americans suffer from varying degrees of Alzheimer's disease (AD) and by the year 2050 it may be one in 85 people globally (100 Million). It will be shown that heavy metal toxicity plays a significant role in sporadic AD. Although current literature speaks to involvement of metal ions (via Fenton reaction), studies and reviewers have yet to link cellular events including known structural changes such as amyloid plaque development to this metal toxicity the way it is proposed here. Contrary to the current AD model which positions BACE1 (β-secretase) as an aberrant or AD-advancing enzyme, it is proposed herein that the neuron's protective counteraction to this metal toxicity is, in fact, a justified increase in BACE1 activity and amyloid precursor protein (APP) processing to yield more secreted APP (sAPP) and β-amyloid peptide in response to metal toxicity. This new perspective which justifies a functional role for APP, BACE1 enzyme activity and the peptide products from this activity may at first appear to be counterintuitive. Compelling evidence, however, is presented and a mechanism is shown herein that validate BACE1 recruitment and the resulting β-amyloid protein as strategic countermeasures serving the cell effectively against neuro-impeding disease. It is proposed that β-amyloid peptide chelates and sequesters free heavy metals in the extracellular medium to aggregate as amyloid plaque while unchelated β-amyloid migrates across the cell membrane to chelate intracellular free divalent metals. The sequestered intracellular metal is subsequently chaperoned as a metallo-peptide to cross the plasma membrane and aggregate as amyloid plaques extracellularly. The BACE1 countermeasure is not genetic or metabolic aberration; and this novel conclusion demonstrates that it must not be inhibited as currently targeted. APP, BACE1, β-amyloid peptide, and sAPP play positive roles against the preclinical oxidative load that predates AD symptoms for as long as 20 years. A healthy neuron may tolerate free metal toxicity, such as iron in the case of injury-induced amyloid, for as long as twenty years due to this very BACE1 activity. In later stages, the uncontrolled metals and ROS are compounded by other factors which together overcome this BACE1/β-amyloid protein countermeasure. This results in a sudden increase in IL-1 leading to Tau's hyperphosphorylation as cited and eventually to Tau dissociation from the microtubule cytoskeleton interrupting cell trafficking. At this later stage of AD the β-amyloid protein which once served as a vehicle to escort toxic metals to the extracellular medium and a trap to form a relatively benign extraneuronal disposal site is no longer translocated due to interruption of trafficking and now accumulates intracellularly facilitating hyper-oxidative ROS levels and contributes to irreversible neuron apoptosis.
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Affiliation(s)
- Franco Cavaleri
- Brain Research Center, UBC Hospital, 2211 Wesbrook Mall, Vancouver, BC V6T 2B5, Canada.
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232
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Abstract
A better understanding of the pathological mechanisms that drive neurodegeneration in individuals with multiple sclerosis is needed to develop therapies that will effectively treat patients in the primary and secondary progressive stages of the disease. We propose that the inflammatory demyelinating disease process in early multiple sclerosis triggers a cascade of events that lead to neurodegeneration and are amplified by pathogenic mechanisms related to brain ageing and accumulated disease burden. Key elements driving neurodegeneration include microglia activation, chronic oxidative injury, accumulation of mitochondrial damage in axons, and age-related iron accumulation in the human brain. Altered mitochondrial function in axons might be of particular importance. This process leads to chronic cell stress and imbalance of ionic homoeostasis, resulting in axonal and neuronal death. The evidence suggests that treatment of progressive multiple sclerosis should be based on a combination of anti-inflammatory, regenerative, and neuroprotective strategies.
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Affiliation(s)
- Don H Mahad
- Centre for Neuroregeneration, University of Edinburgh, Edinburgh, UK
| | - Bruce D Trapp
- Department of Neurosciences, Lerner Research Institute, Cleveland Clinic, Cleveland, OH, USA
| | - Hans Lassmann
- Center for Brain Research, Medical University of Vienna, Austria.
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233
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Youn P, Chen Y, Furgeson DY. Cytoprotection against beta-amyloid (Aβ) peptide-mediated oxidative damage and autophagy by Keap1 RNAi in human glioma U87mg cells. Neurosci Res 2015; 94:70-8. [PMID: 25612817 DOI: 10.1016/j.neures.2014.12.015] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2014] [Revised: 12/17/2014] [Accepted: 12/22/2014] [Indexed: 12/31/2022]
Abstract
Extensive oxidative stress has been considered a primary pathological factor for many neurodegenerative disorders (NDDs). We speculated that the oxidative damage to brain cells can be managed by promoting the endogenous cellular antioxidants through the RNA interference (RNAi) against Keap1 (kelch-like ECH-associated protein). Keap1 acts as a negative regulator of Nrf2 (NF-E2-related factor 2) that represses the activation of the antioxidant responsive element (ARE). Here, we investigated whether Keap1 knockdown enhances the cellular antioxidant capacity and provides the neuroprotection against oxidative stress from hydrogen peroxide and beta-amyloid (Aβ) peptide in U87mg cells. We found that the Keap1 siRNA pre-treated group displayed higher expression of diverse antioxidant genes and an increased antioxidant capacity compared to the control group. Moreover, the Keap1 RNAi exerted a cytoprotective effect against H2O2 treatment. In Aβ peptide treatment experiments, the Keap1 siRNA pre-treated groups maintained acceptable cell viability, relatively intact cellular morphology, and controlled oxidative damage levels while the control groups suffered from Aβ peptide-mediated neurotoxicity. Keap1 RNAi also attenuated the oxidative stress-mediated autophagy as well. These findings suggest that Keap1 RNAi can serve as a therapeutic strategy for relieving oxidative stress-associated symptoms in many NDDs.
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Affiliation(s)
- Pilju Youn
- Department of Pharmaceutics and Pharmaceutical Chemistry, University of Utah, Salt Lake City, UT 84112, United States
| | - Yizhe Chen
- Department of Pharmaceutics and Pharmaceutical Chemistry, University of Utah, Salt Lake City, UT 84112, United States
| | - Darin Y Furgeson
- Department of Pharmaceutics and Pharmaceutical Chemistry, University of Utah, Salt Lake City, UT 84112, United States.
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234
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Bakunina N, Pariante CM, Zunszain PA. Immune mechanisms linked to depression via oxidative stress and neuroprogression. Immunology 2015; 144:365-373. [PMID: 25580634 DOI: 10.1111/imm.12443] [Citation(s) in RCA: 272] [Impact Index Per Article: 30.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2014] [Revised: 12/21/2014] [Accepted: 01/05/2015] [Indexed: 12/13/2022] Open
Abstract
Emerging evidence suggests the significant role of inflammation and oxidative stress as main contributors to the neuroprogression that is observed in major depressive disorder (MDD), where patients show increased inflammatory and oxidative stress biomarkers. The process of neuroprogression includes stage-related neurodegeneration, cell death, reduced neurogenesis, reduced neuronal plasticity and increased autoimmune responses. Oxidative stress is a consequence of the biological imbalance between Reactive Oxygen Species (ROS) and antioxidants, leading to the alteration of biomolecules and the loss of control of the intracellular redox-related signaling pathways. ROS serve as crucial secondary messengers in signal transduction and significantly affect inflammatory pathways by activating NF-κB and MAPK family stress kinases. When present in excess, ROS inflict damage, affecting cellular constituents with the formation of pro-inflammatory molecules, such as malondialdehyde, 4-Hydroxynonenal, neoepitopes and damage-associated molecular patterns promoting immune response, and ultimately leading to cell death. The failure of cells to adapt to the changes in redox homeostasis and the subsequent cell death, together with the damage caused by inflammatory mediators, have been considered as major causes of neuroprogression and hence MDD. Both an activated immune-inflammatory system and increased oxidative stress act synergistically, complicating our understanding of the pathogenesis of depression. The cascade of antioxidative and inflammatory events is orchestrated by several transcription factors, with Nrf2 and NF-κB having particular relevance to MDD. This review focuses on potential molecular mechanisms through which impaired redox homeostasis and neuroinflammation can affect the neuronal environment and contribute to depression This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Nataliia Bakunina
- Stress, Psychiatry and Immunology Laboratory, Institute of Psychiatry, Psychology & Neuroscience, King's College London, UK
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235
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Chavarria D, Silva T, Martins D, Bravo J, Summavielle T, Garrido J, Borges F. Exploring cinnamic acid scaffold: development of promising neuroprotective lipophilic antioxidants. MEDCHEMCOMM 2015. [DOI: 10.1039/c5md00018a] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
New lipophilic hydroxycinnamic acid based derivatives were designed and synthesized and their antioxidant and neuroprotective activities evaluated.
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Affiliation(s)
- Daniel Chavarria
- CIQ/Department of Chemistry Biochemistry
- Faculty of Sciences
- University of Porto
- 4169-007 Porto
- Portugal
| | - Tiago Silva
- CIQ/Department of Chemistry Biochemistry
- Faculty of Sciences
- University of Porto
- 4169-007 Porto
- Portugal
| | - Daniel Martins
- CIQ/Department of Chemistry Biochemistry
- Faculty of Sciences
- University of Porto
- 4169-007 Porto
- Portugal
| | - Joana Bravo
- Addiction Biology Group
- Institute for Molecular and Cell Biology
- University of Porto
- Porto
- Portugal
| | - Teresa Summavielle
- Addiction Biology Group
- Institute for Molecular and Cell Biology
- University of Porto
- Porto
- Portugal
| | - Jorge Garrido
- Department of Chemical Engineering
- School of Engineering (ISEP)
- Polytechnic of Porto
- 4200-072 Porto
- Portugal
| | - Fernanda Borges
- CIQ/Department of Chemistry Biochemistry
- Faculty of Sciences
- University of Porto
- 4169-007 Porto
- Portugal
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236
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McKelvey SM, Horgan KA, Murphy RA. Chemical form of selenium differentially influences DNA repair pathways following exposure to lead nitrate. J Trace Elem Med Biol 2015; 29:151-69. [PMID: 25023848 DOI: 10.1016/j.jtemb.2014.06.005] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/18/2014] [Revised: 06/09/2014] [Accepted: 06/12/2014] [Indexed: 10/25/2022]
Abstract
Lead, an environmental toxin is known to induce a broad range of physiological and biochemical dysfunctions in humans through a number of mechanisms including the deactivation of antioxidants thus leading to generation of reactive oxygen species (ROS) and subsequent DNA damage. Selenium on the other hand has been proven to play an important role in the protection of cells from free radical damage and oxidative stress, though its effects are thought to be form and dose dependent. As the liver is the primary organ required for metabolite detoxification, HepG2 cells were chosen to assess the protective effects of various selenium compounds following exposure to the genotoxic agent lead nitrate. Initially DNA damage was quantified using a comet assay, gene expression patterns associated with DNA damage and signalling were also examined using PCR arrays and the biological pathways which were most significantly affected by selenium were identified. Interestingly, the organic type selenium compounds (selenium yeast and selenomethionine) conferred protection against lead induced DNA damage in HepG2 cells; this is evident by reduction in the quantity of DNA present in the comet tail of cells cultured in their presence with lead. This trend also followed through the gene expression changes noted in DNA damage pathways analysed. These results were in contrast with those of inorganic sodium selenite which promoted lead induced DNA damage evident in both the comet assay results and the gene expression analysis. Over all this study provided valuable insights into the effects which various selenium compounds had on the DNA damage and signalling pathway indicating the potential for using organic forms of selenium such as selenium enriched yeast to protect against DNA damaging agents.
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Affiliation(s)
- Shauna M McKelvey
- Alltech Biotechnology Centre, Sarney, Summerhill Rd., Dunboyne, County Meath, Ireland.
| | - Karina A Horgan
- Alltech Biotechnology Centre, Sarney, Summerhill Rd., Dunboyne, County Meath, Ireland
| | - Richard A Murphy
- Alltech Biotechnology Centre, Sarney, Summerhill Rd., Dunboyne, County Meath, Ireland
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KCHO-1, a Novel Antineuroinflammatory Agent, Inhibits Lipopolysaccharide-Induced Neuroinflammatory Responses through Nrf2-Mediated Heme Oxygenase-1 Expression in Mouse BV2 Microglia Cells. EVIDENCE-BASED COMPLEMENTARY AND ALTERNATIVE MEDICINE 2014; 2014:357154. [PMID: 25580149 PMCID: PMC4279125 DOI: 10.1155/2014/357154] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/23/2014] [Accepted: 11/24/2014] [Indexed: 12/16/2022]
Abstract
The brain is vulnerable to oxidative stress and inflammation that can occur as a result of aging or neurodegenerative diseases. Our work has sought to identify natural products that regulate heme oxygenase (HO)-1 and to determine their mechanism of action in neurodegenerative diseases. KCHO-1 is a novel herbal therapeutic containing 30% ethanol (EtOH) extracts from nine plants. In this study, we investigated the antineuroinflammatory effects of KCHO-1 in lipopolysaccharide- (LPS-) treated mouse BV2 microglia. KCHO-1 inhibited the protein expression of inducible nitric oxide synthase (iNOS), iNOS-derived nitric oxide (NO), cyclooxygenase- (COX-) 2, and COX-2-derived prostaglandin E2 (PGE2) in LPS-stimulated BV2 microglia. It also reduced tumor necrosis factor-α (TNF-α), interleukin-1β (IL-1β), and IL-6 production. This effect was correlated with the suppression of inhibitor of nuclear factor kappa B-α (IκB-α) phosphorylation and degradation and nuclear factor kappa B (NF-κB) translocation and DNA binding. Additionally, KCHO-1 upregulated HO-1 expression by promoting nuclear translocation of nuclear factor E2-related factor 2 (Nrf2) in mouse BV2 microglia. Tin protoporphyrin (SnPP), an HO activity inhibitor, was used to verify the inhibitory effects of KCHO-1 on proinflammatory mediators and proteins associated with HO-1 expression. Our data suggest that KCHO-1 has therapeutic potential in neurodegenerative diseases caused by neuroinflammation.
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238
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Jeong YH, Park JS, Kim DH, Kim HS. Arctigenin Increases Hemeoxygenase-1 Gene Expression by Modulating PI3K/AKT Signaling Pathway in Rat Primary Astrocytes. Biomol Ther (Seoul) 2014; 22:497-502. [PMID: 25489416 PMCID: PMC4256028 DOI: 10.4062/biomolther.2014.121] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2014] [Revised: 11/04/2014] [Accepted: 11/05/2014] [Indexed: 12/30/2022] Open
Abstract
In the present study, we found that the natural compound arctigenin inhibited hydrogen peroxide-induced reactive oxygen species (ROS) production in rat primary astrocytes. Since hemeoxygenase-1 (HO-1) plays a critical role as an antioxidant defense factor in the brain, we examined the effect of arctigenin on HO-1 expression in rat primary astrocytes. We found that arctigenin increased HO-1 mRNA and protein levels. Arctigenin also increases the nuclear translocation and DNA binding of Nrf2/c-Jun to the antioxidant response element (ARE) on HO-1 promoter. In addition, arctigenin increased ARE-mediated transcriptional activities in rat primary astrocytes. Further mechanistic studies revealed that arctigenin increased the phosphorylation of AKT, a downstream substrate of phosphatidylinositol 3-kinase (PI3K). Treatment of cells with a PI3K-specific inhibitor, LY294002, suppressed the HO-1 expression, Nrf2 DNA binding and ARE-mediated transcriptional activities in arctigenin-treated astrocyte cells. The results collectively suggest that PI3K/AKT signaling pathway is at least partly involved in HO-1 expression by arctigenin via modulation of Nrf2/ARE axis in rat primary astrocytes.
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Affiliation(s)
- Yeon-Hui Jeong
- Department of Molecular Medicine, Tissue Injury Defense Research Center, Ewha Womans University Medical School, Seoul 158-710
| | - Jin-Sun Park
- Department of Molecular Medicine, Tissue Injury Defense Research Center, Ewha Womans University Medical School, Seoul 158-710
| | - Dong-Hyun Kim
- Life and Nanopharmaceutical Sciences, College of Pharmacy, Kyung Hee University, Seoul 130-701, Republic of Korea
| | - Hee-Sun Kim
- Department of Molecular Medicine, Tissue Injury Defense Research Center, Ewha Womans University Medical School, Seoul 158-710
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Re L, Martínez-Sánchez G, Bordicchia M, Malcangi G, Pocognoli A, Morales-Segura MA, Rothchild J, Rojas A. Is ozone pre-conditioning effect linked to Nrf2/EpRE activation pathway in vivo? A preliminary result. Eur J Pharmacol 2014; 742:158-62. [PMID: 25218903 DOI: 10.1016/j.ejphar.2014.08.029] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2014] [Revised: 08/17/2014] [Accepted: 08/18/2014] [Indexed: 02/07/2023]
Abstract
The present preliminary study has been focused on verifying whether ozone preconditioning may be linked to Nrf2/EpRE (nuclear factor erythroid 2/electrophile-responsive element) activation pathway in vivo. Healthy volunteers received a total of three Major Auto-Hemotherapy (MAH) treatments, with treatments administered every second day. The amount of blood used for each subject was standardized to the value obtained multiplying the subject׳s body weight by 1.3 in order to ensure the same ozone concentrations for each subject. A parallel group (n=50) age and gender matched was used as reference for the experimental variables related to the oxidative stress parameters. Levels of Nrf2 and oxidative stress index were measured throughout the study. Levels of Nrf2 (P<0.01) in peripheral blood mononuclear cells (PBMC) were found to increase immediately after ozone/oxygen exposure (35µg/ml, prior to reinfusion). This effect was still detected (P<0.05) in total circulating PBMC when measured 30min following reinfusion. After a series of 3 MAH, Nrf2 returned back to the basal level. At the end of the experiment the activities of superoxide dismutase and catalase were increased (P<0.05). These data demonstrate for the first time in vivo the activation of the Nrf2 pathway by a low dose of ozone and the promotion of the feedback mechanism that induces the synthesis of proteins which collectively favors cell survival.
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Affiliation(s)
- Lamberto Re
- Clinical Pharmacology & Toxicology Department, Medinat SAS, Via Fazioli 22, 60021 Camerano, Ancona, Italy.
| | - Gregorio Martínez-Sánchez
- Medical Center Beauty Benefit - San Biagio di Osimo, Via Mons. Oscar Romero, 31, 60027 Osimo, Ancona, Italy
| | - Marica Bordicchia
- Department of Internal Medicine, University of Ancona, Politecnica delle Marche, 60131 Ancona, Italy
| | - Giuseppe Malcangi
- Clinical Pharmacology & Toxicology Department, Medinat SAS, Via Fazioli 22, 60021 Camerano, Ancona, Italy
| | - Antonella Pocognoli
- Department of Internal Medicine, University of Ancona, Politecnica delle Marche, 60131 Ancona, Italy
| | | | - John Rothchild
- Holistic Dentist Clinic, 175 Mercado Street, Suite 115, Durango, CO 81301, USA
| | - Armando Rojas
- Biomedical Research Laboratories, Medicine Faculty, Catholic University of Maule, Talca, Chile
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240
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Marro M, Taubes A, Abernathy A, Balint S, Moreno B, Sanchez-Dalmau B, Martínez-Lapiscina EH, Amat-Roldan I, Petrov D, Villoslada P. Dynamic molecular monitoring of retina inflammation by in vivo Raman spectroscopy coupled with multivariate analysis. JOURNAL OF BIOPHOTONICS 2014; 7:724-34. [PMID: 24019106 DOI: 10.1002/jbio.201300101] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/23/2013] [Revised: 08/20/2013] [Accepted: 08/20/2013] [Indexed: 05/06/2023]
Abstract
Retinal tissue is damaged during inflammation in Multiple Sclerosis. We assessed molecular changes in inflamed murine retinal cultures by Raman spectroscopy. Partial Least Squares-Discriminant analysis (PLS-DA) was able to classify retina cultures as inflamed with high accuracy. Using Multivariate Curve Resolution (MCR) analysis, we deconvolved 6 molecular components suffering dynamic changes along inflammatory process. Those include the increase of immune mediators (Lipoxygenase, iNOS and TNFα), changes in molecules involved in energy production (Cytochrome C, phenylalanine and NADH/NAD+) and decrease of Phosphatidylcholine. Raman spectroscopy combined with multivariate analysis allows monitoring the evolution of retina inflammation.
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Affiliation(s)
- Monica Marro
- ICFO - The Institute of Photonic Sciences, Barcelona, Spain
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241
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Yang Y, Huang J, Li L, Lin L, Zhai Y, Chen X, Liu X, Wu Z, Yuan J. Up-regulation of nuclear factor E2-related factor 2 upon SVCV infection. FISH & SHELLFISH IMMUNOLOGY 2014; 40:245-252. [PMID: 25038284 DOI: 10.1016/j.fsi.2014.07.015] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/17/2014] [Revised: 07/03/2014] [Accepted: 07/08/2014] [Indexed: 06/03/2023]
Abstract
Nuclear factor E2 - related factor 2 (Nrf2) is a crucial transcription factor that regulates the basal and inducible expression of many antioxidant response element (ARE)-dependent genes, including heme oxygenase-1 (HO-1) and superoxide dismutase 1 (SOD1). The Nrf2/ARE pathway has been regarded as a critical switch in the initiation of cellular defence systems for surviving oxidative insults and viral infection. In this study, the Nrf2 gene of EPC cells, which is originally derived from Pimephales promelas, was cloned, and an investigation on the interactions between Nrf2 and spring viraemia of carp virus (SVCV) was performed. These results demonstrated that the virus facilitated the nuclear accumulation of Nrf2 and up-regulated its transcriptional and protein profiles in EPC cells. In addition, exogenous activation of Nrf2 conferred EPC cells with a higher cellular total antioxidant capacity via an increase in the expression of HO-1 and SOD1, but did not suppress the replication of SVCV.
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Affiliation(s)
- Yi Yang
- Department of Aquatic Animal Medicine, College of Fisheries, Huazhong Agricultural University, Wuhan, 430070, China; Key Lab of Freshwater Animal Breeding, Ministry of Agriculture, Wuhan, 430070, China
| | - Jian Huang
- Department of Aquatic Animal Medicine, College of Fisheries, Huazhong Agricultural University, Wuhan, 430070, China; Freshwater Aquaculture Collaborative Innovation Center of Hubei Province, Wuhan, 430070, China
| | - Lijuan Li
- Department of Aquatic Animal Medicine, College of Fisheries, Huazhong Agricultural University, Wuhan, 430070, China; Freshwater Aquaculture Collaborative Innovation Center of Hubei Province, Wuhan, 430070, China
| | - Li Lin
- Department of Aquatic Animal Medicine, College of Fisheries, Huazhong Agricultural University, Wuhan, 430070, China; Freshwater Aquaculture Collaborative Innovation Center of Hubei Province, Wuhan, 430070, China
| | - Yanhua Zhai
- Department of Aquatic Animal Medicine, College of Fisheries, Huazhong Agricultural University, Wuhan, 430070, China
| | - Xiaoxuan Chen
- Department of Aquatic Animal Medicine, College of Fisheries, Huazhong Agricultural University, Wuhan, 430070, China; Freshwater Aquaculture Collaborative Innovation Center of Hubei Province, Wuhan, 430070, China
| | - Xueqin Liu
- Department of Aquatic Animal Medicine, College of Fisheries, Huazhong Agricultural University, Wuhan, 430070, China; Key Lab of Freshwater Animal Breeding, Ministry of Agriculture, Wuhan, 430070, China
| | - Zhixin Wu
- Department of Aquatic Animal Medicine, College of Fisheries, Huazhong Agricultural University, Wuhan, 430070, China; Freshwater Aquaculture Collaborative Innovation Center of Hubei Province, Wuhan, 430070, China.
| | - Junfa Yuan
- Department of Aquatic Animal Medicine, College of Fisheries, Huazhong Agricultural University, Wuhan, 430070, China; Freshwater Aquaculture Collaborative Innovation Center of Hubei Province, Wuhan, 430070, China; Key Lab of Freshwater Animal Breeding, Ministry of Agriculture, Wuhan, 430070, China.
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242
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Gao Y, Chu SF, Li JP, Zuo W, Wen ZL, He WB, Yan JQ, Chen NH. Do glial cells play an anti-oxidative role in Huntington's disease? Free Radic Res 2014; 48:1135-44. [PMID: 24957138 DOI: 10.3109/10715762.2014.936432] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
Oxidative stress is a condition of imbalance between reactive oxygen species (ROS) formation and antioxidant capacity as a result of dysfunction of the antioxidant system. ROS can be served as a second messenger at low or moderate concentration, while excessive amount of ROS under oxidative stress condition would destroy macromolecules like proteins, DNA, and lipids, finally leading to cell apoptosis or necrosis. Changes in these macromolecules are involved in various pathological changes and progression of diseases, especially neurodegenerative diseases. Neurodegenerative diseases are morphologically featured by progressive neuronal cell loss, accompanied with inclusions formed by protein aggregates in neurons or glial cells. Neurons have always received much more attention than glial cells in neurodegenerative diseases. Actually, glial cells might play a key role in the functioning of neurons and cellular survival through an antioxidant way. Additionally, neurons can modulate the activities of glia either. Herein, the main purposes of this review are to mention the connection between Huntington's disease (HD) and oxidative stress, to summarize the characteristics and functions of glial cells in HD, to state the cross talk between neurons and glial cells, and to emphasize the conclusive role of activation of Keap1-Nrf2-ARE pathway in glial cells against oxidative stress in HD.
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Affiliation(s)
- Y Gao
- Department of Pharmacology, State Key of Laboratory Bioactive Substances and Functions of Natural Medicines, Institute of MateriaMedica, Neuroscience Center, Chinese Academy of Medical Sciences and Peking Union Medical College , Beijing , P. R. China
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243
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Lee DS, Ko W, Kim DC, Kim YC, Jeong GS. Cudarflavone B provides neuroprotection against glutamate-induced mouse hippocampal HT22 cell damage through the Nrf2 and PI3K/Akt signaling pathways. Molecules 2014; 19:10818-31. [PMID: 25061726 PMCID: PMC6271666 DOI: 10.3390/molecules190810818] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2014] [Revised: 07/10/2014] [Accepted: 07/15/2014] [Indexed: 11/16/2022] Open
Abstract
Oxidative cell damage contributes to neuronal degeneration in many central nervous system (CNS) diseases such as Alzheimer's disease, Parkinson's disease, and ischemia. Nrf2 signaling-mediated heme oxygenase (HO)-1 expression acts against oxidants that are thought to play a key role in the pathogenesis of neuronal diseases. Cudraflavone B is a prenylated flavone isolated from C. tricuspidata which has shown anti-proliferative activity, mouse brain monoamine oxidase (MAO) inhibitory effects, apoptotic actions in human gastric carcinoma cells and mouse melanoma cells, and hepatoprotective activity. In this study, cudraflavone B showed neuroprotective effects and reactive oxygen species (ROS) inhibition against glutamate-induced neurotoxicity by inducing the expression of HO-1 in mouse hippocampal HT22 cells. Furthermore, cudraflavone B caused the nuclear accumulation of nuclear factor-E2-related factor 2 (Nrf2) and increased the promoter activity of antioxidant response elements (ARE) in mouse hippocampal HT22 cells. In addition, we found that the Nrf2-midiated HO-1 expression by cudraflavone B is involved in the cell protective response and ROS reductions, and cudraflavone B-induced expression of HO-1 was mediated through the phosphatidylinositol 3-kinase (PI3K)/Akt pathway in HT22 cells. Our results demonstrated the potential application of naturally occurring cudraflavone B as a therapeutic agent from neurodegenerative disease.
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Affiliation(s)
- Dong-Sung Lee
- Inha Research Institute for Medical Sciences, Inha University School of Medicine, Incheon 400-712, Korea.
| | - Wonmin Ko
- College of Pharmacy, Wonkwang University, Iksan 570-749, Korea.
| | - Dong-Cheol Kim
- College of Pharmacy, Wonkwang University, Iksan 570-749, Korea.
| | - Youn-Chul Kim
- College of Pharmacy, Wonkwang University, Iksan 570-749, Korea.
| | - Gil-Saeng Jeong
- College of Pharmacy, Keimyung University, 1095 Dalgubeol-daero, Daegu 704-701, Korea.
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244
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Guedes RP, Csizmadia E, Moll HP, Ma A, Ferran C, da Silva CG. A20 deficiency causes spontaneous neuroinflammation in mice. J Neuroinflammation 2014; 11:122. [PMID: 25026958 PMCID: PMC4128606 DOI: 10.1186/1742-2094-11-122] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2014] [Accepted: 06/25/2014] [Indexed: 11/10/2022] Open
Abstract
Background A20 (TNFAIP3) is a pleiotropic NFκB-dependent gene that terminates NFκB activation in response to inflammatory stimuli. The potent anti-inflammatory properties of A20 are well characterized in several organs. However, little is known about its role in the brain. In this study, we investigated the brain phenotype of A20 heterozygous (HT) and knockout (KO) mice. Methods The inflammatory status of A20 wild type (WT), HT and KO brain was determined by immunostaining, quantitative PCR, and Western blot analysis. Cytokines secretion was evaluated by ELISA. Quantitative results were statistically analyzed by ANOVA followed by a post-hoc test. Results Total loss of A20 caused remarkable reactive microgliosis and astrogliosis, as determined by F4/80 and GFAP immunostaining. Glial activation correlated with significantly higher mRNA and protein levels of the pro-inflammatory molecules TNF, IL-6, and MCP-1 in cerebral cortex and hippocampus of A20 KO, as compared to WT. Basal and TNF/LPS-induced cytokine production was significantly higher in A20 deficient mouse primary astrocytes and in a mouse microglia cell line. Brain endothelium of A20 KO mice demonstrated baseline activation as shown by increased vascular immunostaining for ICAM-1 and VCAM-1, and mRNA levels of E-selectin. In addition, total loss of A20 increased basal brain oxidative/nitrosative stress, as indicated by higher iNOS and NADPH oxidase subunit gp91phox levels, correlating with increased protein nitration, gauged by nitrotyrosine immunostaining. Notably, we also observed lower neurofilaments immunostaining in A20 KO brains, suggesting higher susceptibility to axonal injury. Importantly, A20 HT brains showed an intermediate phenotype, exhibiting considerable, albeit not statistically significant, increase in markers of basal inflammation when compared to WT. Conclusions This is the first characterization of spontaneous neuroinflammation caused by total or partial loss of A20, suggesting its key role in maintenance of nervous tissue homeostasis, particularly control of inflammation. Remarkably, mere partial loss of A20 was sufficient to cause chronic, spontaneous low-grade cerebral inflammation, which could sensitize these animals to neurodegenerative diseases. These findings carry strong clinical relevance in that they question implication of identified A20 SNPs that lower A20 expression/function (phenocopying A20 HT mice) in the pathophysiology of neuroinflammatory diseases.
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Affiliation(s)
| | | | | | | | | | - Cleide Gonçalves da Silva
- Division of Vascular Surgery, Center for Vascular Biology Research and the Transplant Institute, Department of Surgery, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA.
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245
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Yao J, Ge C, Duan D, Zhang B, Cui X, Peng S, Liu Y, Fang J. Activation of the phase II enzymes for neuroprotection by ginger active constituent 6-dehydrogingerdione in PC12 cells. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2014; 62:5507-18. [PMID: 24869427 DOI: 10.1021/jf405553v] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
The cellular endogenous antioxidant system plays pivotal roles in counteracting or retarding the pathogenesis of many neurodegenerative diseases. Molecules with the ability to enhance the antioxidant defense thus are promising candidates for neuroprotective drugs. 6-Dehydrogingerdione (6-DG), one of the major components of dietary ginger, has received increasing attention due to its multiple pharmacological activities. However, how this pleiotropic molecule works on the neuronal system has not been studied. This paper reports that 6-DG efficiently scavenges various free radicals in vitro and displays remarkable cytoprotection against oxidative stress-induced neuronal cell damage in the neuron-like rat pheochromocytoma cell line, PC12 cells. Pretreatment of PC12 cells with 6-DG significantly up-regulates a panel of phase II genes as well as the corresponding gene products, such as glutathione, heme oxygenase, NAD(P)H quinone oxidoreductase, and thioredoxin reductase. Mechanistic study indicates that activation of the Keap1-Nrf2-ARE pathway is the molecular basis for the cytoprotection of 6-DG. This is the first revelation of this novel mechanism of 6-DG as an Nrf2 activator against oxidative injury, providing the potential therapeutic use of 6-DG as neuroprotective agent.
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Affiliation(s)
- Juan Yao
- State Key Laboratory of Applied Organic Chemistry and College of Chemistry and Chemical Engineering, Lanzhou University , Lanzhou, Gansu 730000, China
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246
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Chao XJ, Chen ZW, Liu AM, He XX, Wang SG, Wang YT, Liu PQ, Ramassamy C, Mak SH, Cui W, Kong AN, Yu ZL, Han YF, Pi RB. Effect of tacrine-3-caffeic acid, a novel multifunctional anti-Alzheimer's dimer, against oxidative-stress-induced cell death in HT22 hippocampal neurons: involvement of Nrf2/HO-1 pathway. CNS Neurosci Ther 2014; 20:840-50. [PMID: 24922524 DOI: 10.1111/cns.12286] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2014] [Revised: 04/23/2014] [Accepted: 04/24/2014] [Indexed: 12/27/2022] Open
Abstract
AIMS Oxidative stress (OS) plays an important role in the pathogenesis of neurodegenerative diseases, including Alzheimer's disease (AD). This study was designed to uncover the cellular and biochemical mechanisms underlying the neuroprotective effects of tacrine-3-caffeic acid (T3CA), a novel promising multifunctional anti-Alzheimer's dimer, against OS-induced neuronal death. METHODS AND RESULTS T3CA protected HT22 cells against high-concentration-glutamate-induced cell death in time- and concentration-dependent manners and potently attenuated glutamate-induced intracellular reactive oxygen species (ROS) production as well as mitochondrial membrane-potential (ΔΨ) disruption. Besides, T3CA significantly induced nuclear factor erythroid 2-related factor 2 (Nrf2) nuclear translocation and increased its transcriptional activity, which were demonstrated by Western blotting, immunofluorescence, and antioxidant response element (ARE)-luciferase reporter gene assay. Further studies showed that T3CA potently up-regulated heme oxygenase-1 (HO-1), an endogenous antioxidative enzyme and a downstream effector of Nrf2, at both mRNA and protein levels. The neuroprotective effects of T3CA were partially reversed by brusatol, which reduced protein level of Nrf2, or by inhibiting HO-1 with siRNA or ZnPP-IX, a specific inhibitor of HO-1. CONCLUSIONS Taken together, these results clearly demonstrate that T3CA protects neurons against OS-induced cell death partially through Nrf2/ARE/HO-1 signaling pathway, which further supports that T3CA might be a promising novel therapeutic agent for OS-associated diseases.
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Affiliation(s)
- Xiao-Juan Chao
- Department of Pharmacology & Toxicology, School of Pharmaceutical Sciences, Sun Yat-Sen University, Guangzhou, China
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247
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Wang Z, Ji C, Wu L, Qiu J, Li Q, Shao Z, Chen G. Tert-butylhydroquinone alleviates early brain injury and cognitive dysfunction after experimental subarachnoid hemorrhage: role of Keap1/Nrf2/ARE pathway. PLoS One 2014; 9:e97685. [PMID: 24848277 PMCID: PMC4029824 DOI: 10.1371/journal.pone.0097685] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2013] [Accepted: 04/23/2014] [Indexed: 11/18/2022] Open
Abstract
Tert-butylhydroquinone (tBHQ), an Nrf2 activator, has demonstrated neuroprotection against brain trauma and ischemic stroke in vivo. However, little work has been done with respect to its effect on early brain injury (EBI) after subarachnoid hemorrhage (SAH). At the same time, as an oral medication, it may have extensive clinical applications for the treatment of SAH-induced cognitive dysfunction. This study was undertaken to evaluate the influence of tBHQ on EBI, secondary deficits of learning and memory, and the Keap1/Nrf2/ARE pathway in a rat SAH model. SD rats were divided into four groups: (1) Control group (n=40); (2) SAH group (n=40); (3) SAH+vehicle group (n=40); and (4) SAH+tBHQ group (n=40). All SAH animals were subjected to injection of autologous blood into the prechiasmatic cistern once in 20 s. In SAH+tBHQ group, tBHQ was administered via oral gavage at a dose of 12.5 mg/kg at 2 h, 12 h, 24 h, and 36 h after SAH. In the first set of experiments, brain samples were extracted and evaluated 48 h after SAH. In the second set of experiments, changes in cognition and memory were investigated in a Morris water maze. Results shows that administration of tBHQ after SAH significantly ameliorated EBI-related problems, such as brain edema, blood-brain barrier (BBB) impairment, clinical behavior deficits, cortical apoptosis, and neurodegeneration. Learning deficits induced by SAH was markedly alleviated after tBHQ therapy. Treatment with tBHQ markedly up-regulated the expression of Keap1, Nrf2, HO-1, NQO1, and GSTα1 after SAH. In conclusion, the administration of tBHQ abated the development of EBI and cognitive dysfunction in this SAH model. Its action was probably mediated by activation of the Keap1/Nrf2/ARE pathway.
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Affiliation(s)
- Zhong Wang
- Department of Neurosurgery, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu Province, China
| | - Chengyuan Ji
- Department of Neurosurgery, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu Province, China
| | - Lingyun Wu
- Department of Neurosurgery, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu Province, China
| | - Jiaoxue Qiu
- Department of Neurosurgery, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu Province, China
| | - Qi Li
- Department of Neurosurgery, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu Province, China
| | - Zhong Shao
- Department of Neurosurgery, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu Province, China
| | - Gang Chen
- Department of Neurosurgery, The First Affiliated Hospital of Soochow University, Suzhou, Jiangsu Province, China
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248
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Carvalho AN, Lim JL, Nijland PG, Witte ME, Van Horssen J. Glutathione in multiple sclerosis: More than just an antioxidant? Mult Scler 2014; 20:1425-31. [DOI: 10.1177/1352458514533400] [Citation(s) in RCA: 63] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Oxidative stress has been strongly implicated in both the inflammatory and neurodegenerative pathological mechanisms in multiple sclerosis (MS). In response to oxidative stress, cells increase and activate their cellular antioxidant mechanisms. Glutathione (GSH) is the major antioxidant in the brain, and as such plays a pivotal role in the detoxification of reactive oxidants. Previous research has shown that GSH homeostasis is altered in MS. In this review, we provide a comprehensive overview on GSH metabolism in brain cells, with a focus on its involvement in MS. The potential of GSH as an in vivo biomarker in MS is discussed, along with a short overview of improvements in imaging methods that allow non-invasive quantification of GSH in the brain. These methods might be instrumental in providing real-time measures of GSH, allowing the assessment of the oxidative state in MS patients and the monitoring of disease progression. Finally, the therapeutic potential of GSH in MS is discussed.
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Affiliation(s)
- Andreia N Carvalho
- Vrije Universiteit (VU) University Medical Center Amsterdam, The Netherlands
| | - Jamie L Lim
- Vrije Universiteit (VU) University Medical Center, Amsterdam, The Netherlands
| | - Philip G Nijland
- Vrije Universiteit (VU) University Medical Center, Amsterdam, The Netherlands
| | - Maarten E Witte
- Vrije Universiteit (VU) University Medical Center, Amsterdam, The Netherlands
| | - Jack Van Horssen
- Vrije Universiteit (VU) University Medical Center, Amsterdam, The Netherlands
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249
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Park JS, Kim HS. Regulation of hemeoxygenase-1 gene expression by Nrf2 and c-Jun in tertiary butylhydroquinone-stimulated rat primary astrocytes. Biochem Biophys Res Commun 2014; 447:672-7. [PMID: 24755082 DOI: 10.1016/j.bbrc.2014.04.073] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2014] [Accepted: 04/14/2014] [Indexed: 12/31/2022]
Abstract
Hemeoxygenase-1 (HO-1) is a phase II antioxidant enzyme that is primarily involved in detoxification and cytoprotection in a variety of tissues. However, the mechanism underlying HO-1 gene expression remains unclear. In the present study, we investigated the regulation of HO-1 expression in primary cultured astrocytes by using the natural antioxidant compound tertiary butylhydroquinone (tBHQ). We found that tBHQ increased HO-1 mRNA and protein levels. Promoter analysis revealed that tBHQ enhanced HO-1 gene transcription in an antioxidant response element (ARE)-dependent manner. In addition, tBHQ increased the nuclear translocation and DNA binding of Nrf2 and c-Jun to ARE. Small interfering RNA (siRNA) experiments demonstrated that Nrf2 and c-Jun are involved in the differential modulation of HO-1 expression. Thus, Nrf2 knockdown reduced the basal level of HO-1 expression but did not affect the fold induction by tBHQ. On the other hand, knockdown of c-Jun diminished tBHQ-mediated induction of HO-1 without affecting basal expression. The data suggest that Nrf2 generally modulates the basal expression of HO-1, while c-Jun mediates HO-1 induction in response to tBHQ. The results of co-immunoprecipitation assays demonstrated a physical interaction between Nrf2 and c-Jun in tBHQ-treated astrocytes. The results suggest that Nrf2 and c-Jun regulate HO-1 expression via their coordinated interaction in tBHQ-treated rat primary astrocytes.
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Affiliation(s)
- Jin-Sun Park
- Department of Molecular Medicine and Global Top5 Research Program, Tissue Injury Defense Research Center, Ewha Womans University Medical School, Seoul 158-710, Republic of Korea
| | - Hee-Sun Kim
- Department of Molecular Medicine and Global Top5 Research Program, Tissue Injury Defense Research Center, Ewha Womans University Medical School, Seoul 158-710, Republic of Korea.
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250
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You H, Wei L, Sun WL, Wang L, Yang ZL, Liu Y, Zheng K, Wang Y, Zhang WJ. The green tea extract epigallocatechin-3-gallate inhibits irradiation-induced pulmonary fibrosis in adult rats. Int J Mol Med 2014; 34:92-102. [PMID: 24736877 PMCID: PMC4072398 DOI: 10.3892/ijmm.2014.1745] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2014] [Accepted: 04/16/2014] [Indexed: 11/30/2022] Open
Abstract
The present study evaluated the effect of epigallocatechin-3-gallate (EGCG), the most abundant catechin in green tea, on irradiation-induced pulmonary fibrosis and elucidated its mechanism of action. A rat model of irradiation-induced pulmonary fibrosis was generated using a 60Co irradiator and a dose of 22 Gy. Rats were intraperitoneally injected with EGCG (25 mg/kg) or dexamethasone (DEX; 5 mg/kg) daily for 30 days. Mortality rates and lung index values were calculated. The severity of fibrosis was evaluated by assaying the hydroxyproline (Hyp) contents of pulmonary and lung tissue sections post-irradiation. Alveolitis and fibrosis scores were obtained from semi-quantitative analyses of hematoxylin and eosin (H&E) and Masson’s trichrome lung section staining, respectively. The serum levels of transforming growth factor β1 (TGF-β1), interleukin (IL)-6, IL-10, and tumor necrosis factor-α (TNF-α) were also measured. Surfactant protein-B (SPB) and α-SMA expression patterns were evaluated using immunohistochemistry, and the protein levels of nuclear transcription factor NF-E2-related factor 2 (Nrf-2) and its associated antioxidant enzymes heme oxygenase-1 enzyme (HO-1) and NAD(P)H:quinone oxidoreductase-1 (NQO-1) were examined via western blot analysis. Treatment with EGCG, but not DEX, reduced mortality rates and lung index scores, improved histological changes in the lung, reduced collagen depositions, reduced MDA content, enhanced SOD activity, inhibited (myo)fibroblast proliferation, protected alveolar epithelial type II (AE2) cells, and regulated serum levels of TGF-β1, IL-6, IL-10, and TNF-α. Treatment with EGCG, but not DEX, activated Nrf-2 and its downstream antioxidant enzymes HO-1 and NQO-1. Taken together, these results showed that EGCG treatment significantly inhibits irradiation-induced pulmonary fibrosis. Furthermore, the results suggested promising clinical EGCG therapies to treat this disorder.
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Affiliation(s)
- Hua You
- Affiliated Hospital of the Academy of Military Medical Sciences, Beijing 100071, P.R. China
| | - Li Wei
- Key Laboratory of Birth Defects and Reproductive Health of the National Health and Family Commission, Chongqing Population and the Family Planning Science and Technology Research Institute, Chongqing 400020, P.R. China
| | - Wan-Liang Sun
- Affiliated Hospital of the Academy of Military Medical Sciences, Beijing 100071, P.R. China
| | - Lei Wang
- Department of Cardiology, Cardiovascular Research Institute, Renmin Hospital, Wuhan University, Wuhan 430060, P.R. China
| | - Zai-Liang Yang
- Research Institute of Surgery, Daping Hospital, Third Military Medical University, Chongqing 400042, P.R. China
| | - Yuan Liu
- Research Institute of Surgery, Daping Hospital, Third Military Medical University, Chongqing 400042, P.R. China
| | - Ke Zheng
- Department of Endocrine Surgery, the First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, P.R. China
| | - Ying Wang
- Clinical Laboratory, Beijing Chao-Yang Hospital, Capital Medical University, Beijing100020, P.R. China
| | - Wei-Jing Zhang
- Affiliated Hospital of the Academy of Military Medical Sciences, Beijing 100071, P.R. China
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