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Nrf2 AND NQO1

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https://www.readbyqxmd.com/read/28523535/self-protection-against-triptolide-induced-toxicity-in-human-hepatic-cells-via-nrf2-are-nqo1-pathway
#1
Ling-Ling Zhou, Cong Zhou, Xiao-Wen Liang, Zhe Feng, Zhang-Pu Liu, Hao-Lu Wang, Xue-Ping Zhou
OBJECTIVE: To find the signaling pathway of triptolide (TP)-induced liver injury and to reveal whether NF-E2-related factor 2 (Nrf2) plays an important role in cellular self-protection. METHODS: The L-02 and HepG2 cells were cultured and treated with various concentrations of TP. The cell viability was observed, and the cell medium was collected for detecting the aspartate aminotransferase (ALT), alanine aminotransferase (AST), lactate dehydrogenase (LDH), superoxide dismutase (SOD) and L-glutathione production (GSH) levels...
May 18, 2017: Chinese Journal of Integrative Medicine
https://www.readbyqxmd.com/read/28522909/in-vitro-and-in-vivo-antioxidative-and-hepatoprotective-activity-of-aqueous-extract-of-cortex-dictamni
#2
Lin Li, Yun-Feng Zhou, Yan-Lin Li, Li-Li Wang, Hiderori Arai, Yang Xu
AIM: To investigate the antioxidant and hepatoprotective effects of Cortex Dictamni aqueous extract (CDAE) in carbon tetrachloride (CCl4)-induced liver damage in rats. METHODS: The in vitro antioxidant effect of CDAE was investigated using α,α-diphenyl-β-picrylhydrazyl (DPPH), 2,2'-azino-bis (3-ethylbenzthiazoline-6-sulfonic acid) (ABTS), β-carotene bleaching, reducing power, and thiobarbituric acid reactive substance assays. A linoleic acid system, including ferric thiocyanate (FTC) and thiobarbituric acid (TBA) assays, was used to evaluate the inhibition of lipid peroxidation...
April 28, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/28518138/betulin-exhibits-anti-inflammatory-activity-in-lps-stimulated-macrophages-and-endotoxin-shocked-mice-through-an-ampk-akt-nrf2-dependent-mechanism
#3
Xinxin Ci, Junfeng Zhou, Hongming Lv, Qinlei Yu, Liping Peng, Shucheng Hua
Continued oxidative stress can lead to chronic inflammation, which in turn could mediate most chronic diseases including cancer. Nuclear factor erythroid 2-related factor (Nrf2), a critical transcriptional activator for antioxidative responses, has envolved to be an attractive drug target for the treatment or prevention of human diseases. In the present study, we investigated the effects and mechanisms of betulin on Nrf2 activation and its involvement in the lipopolysaccharide (LPS)-triggered inflammatory system...
May 18, 2017: Cell Death & Disease
https://www.readbyqxmd.com/read/28515695/chronic-endurance-exercise-impairs-cardiac-structure-and-function-in-middle-aged-mice-with-impaired-nrf2-signaling
#4
Gobinath Shanmugam, Madhusudhanan Narasimhan, Robbie L Conley, Thiagarajan Sairam, Ashutosh Kumar, Ronald P Mason, Ramalingam Sankaran, John R Hoidal, Namakkal S Rajasekaran
Nuclear factor erythroid 2 related factor 2 (Nrf2) signaling maintains the redox homeostasis and its activation is shown to suppress cardiac maladaptation. Earlier we reported that acute endurance exercise (2 days) evoked antioxidant cytoprotection in young WT animals but not in aged WT animals. However, the effect of repeated endurance exercise during biologic aging (WT) characterized by an inherent deterioration in Nrf2 signaling and pathological aging (pronounced oxidative susceptibility-Nrf2 absence) in the myocardium remains elusive...
2017: Frontiers in Physiology
https://www.readbyqxmd.com/read/28513573/nrf2-inhibits-periodontal-ligament-stem-cell-apoptosis-under-excessive-oxidative-stress
#5
Yanli Liu, Hongxu Yang, Yi Wen, Bingyi Li, Yinhua Zhao, Jing Xing, Min Zhang, Yongjin Chen
The present study aimed to analyze novel mechanisms underlying Nrf2-mediated anti-apoptosis in periodontal ligament stem cells (PDLSCs) in the periodontitis oxidative microenvironment. We created an oxidative stress model with H₂O₂-treated PDLSCs. We used real-time PCR, Western blotting, TUNEL staining, fluorogenic assay and transfer genetics to confirm the degree of oxidative stress and apoptosis as well as the function of nuclear factor-erythroid 2-related factor 2 (Nrf2). We demonstrated that with upregulated levels of reactive oxygen species (ROS) and malondialdehyde (MDA), the effect of oxidative stress was obvious under H₂O₂ treatment...
May 17, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28510254/effects-of-mutant-tdp-43-on-the-nrf2-are-pathway-and-protein-expression-of-mafk-and-jdp2-in-nsc-34-cells
#6
Y P Tian, F Y Che, Q P Su, Y C Lu, C P You, L M Huang, S G Wang, L Wang, J X Yu
Amyotrophic lateral sclerosis (ALS) is a neurodegenerative disease that affects motor neurons and lacks an effective treatment. The disease pathogenesis has not been clarified at present. Pathological transactive response DNA-binding protein 43 (TDP-43) plays an important role in the pathogenesis of ALS. Nuclear translocation of nuclear factor erythroid 2 (NF-E2)-related factor 2 (Nrf2) is found in a mutant TDP-43 transgenic cell model, but its downstream antioxidant enzyme expression is decreased. To elucidate the specific mechanism of Nrf2/ARE (antioxidant responsive element) signaling dysfunction, we constructed an ALS cell model with human mutant TDP-43 using the NSC-34 cell line to evaluate the impact of the TDP-43 mutation on the Nrf2/ARE pathway...
May 10, 2017: Genetics and Molecular Research: GMR
https://www.readbyqxmd.com/read/28501854/dual-negative-expression-of-nrf2-and-nqo1-predicts-superior-outcomes-in-patients-with-non-small-cell-lung-cancer
#7
Ying-Hui Tong, Bo Zhang, You-You Yan, Yun Fan, Jia-Wen Yu, Si-Si Kong, Dan Zhang, Luo Fang, Dan Su, Neng-Ming Lin
Functional studies in non-small cell lung cancer (NSCLC) patients revealed that hyperactivation of the NF-E2-related factor 2 (Nrf2) pathway facilitates tumor growth. We examined the usefulness of Nrf2 and NQO1 as indicators of prognosis in NSCLC. Tumor and adjacent non-tumor tissue samples were collected from 215 NSCLC patients who had tumor resections between 2006 and 2011. Immunohistochemistry was performed to detect Nrf2 or NQO1 expression. The correlation between Nrf2 or NQO1 expression and survival outcomes was evaluated using the Kaplan-Meier method and Cox proportional hazards regression model...
April 25, 2017: Oncotarget
https://www.readbyqxmd.com/read/28489907/anti-oxidative-effects-of-4-hydroxybenzyl-alcohol-in-astrocytes-confer-protective-effects-in-autocrine-and-paracrine-manners
#8
Lidan Luo, Seung-Woo Kim, Hye-Kyung Lee, Il-Doo Kim, Hahnbie Lee, Ja-Kyeong Lee
4-Hydroxybenzyl alcohol (4-HBA) is an important phenolic constituent of Gastrodia elata Blume (GEB), a traditional herbal medicine used in East Asia. Many activities have been reported to underlie the beneficial effects of 4-HBA in the brain, and in particular, its anti-inflammatory, anti-oxidative, and anti-zinc-toxic effects have been implicated in the postischemic brain. Here, the authors investigated the anti-oxidative effect of 4-HBA on astrocytes and sought to identify the underlying molecular mechanisms involved...
2017: PloS One
https://www.readbyqxmd.com/read/28487966/oligomeric-proanthocyanidins-protects-a549-cells-against-h2o2-induced-oxidative-stress-via-the-nrf2-are-pathway
#9
Chao Sun, Weiguo Jin, Hongcan Shi
Oxidative signaling and oxidative stress contribute to aging, cancer and diseases resulting from lung fibrosis. In this study, we explored the anti-oxidative potential of oligomeric proanthocyanidins (OPCs), natural flavonoid compounds. We examined the protective effects of OPCs against hydrogen peroxide (H2O2)-induced oxidative stress in non-small cell lung cancer cells (A549). We demonstrated that OPC markedly attenuated H2O2-induced A549 cell viability, as shown by by 3-[4,5-dimethylthiazol-2-yl)]-2,5-diphenyl-tetrazolium bromide (MTT) assay...
June 2017: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/28479510/evaluation-of-the-antioxidant-properties-of-carexanes-in-ags-cells-transfected-with-the-helicobacter-pylori-s-protein-hspb
#10
Elisabetta Buommino, Brigida D'Abrosca, Giovanna Donnarumma, Annamaria Parisi, Monica Scognamiglio, Antonio Fiorentino, Antonio De Luca
Naturally derived compounds represent a potential source of pharmacologically active drugs able to contrast different diseases, including gastric cancer, a multifactorial disease, in which the important role played by H. pylori infection has been demonstrated. Carexanes, stilbene derivatives, isolated from plants of the Carex distachya Desf., are unusual secondary metabolites with a tetracyclic skeleton arising from a cyclization of prenylstilbenoid precursors. In this study we firstly showed the ability of three purified carexanes CxB, CxG, and CxI to enhance the antioxidant response of AGS cells and to contrast the effect of the H...
May 4, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28472605/total-flavonoid-extract-from-abelmoschus-manihot-l-medic-flowers-attenuates-d-galactose-induced-oxidative-stress-in-mouse-liver-through-the-nrf2-pathway
#11
Yan Qiu, Peng-Fei Ai, Jian-Jun Song, Chang Liu, Zhi-Wei Li
Abelmoschus manihot (L.) Medic is an edible hibiscus that is rich in flavonoids, and its use as Chinese herbal medicine for the treatment of diseases and health maintenance dates back to ancient times. The chemical compositions of total flavonoid of A. manihot (L.) Medic flower extract (TFAE) were identified and determined by high performance liquid chromatography (HPLC). The effects of TFAE on antioxidative activities in a d-galactose (d-gal)-induced mouse model and Nrf2-mediated antioxidant responses were evaluated...
May 4, 2017: Journal of Medicinal Food
https://www.readbyqxmd.com/read/28459555/ameliorative-effect-of-ecklonia-cava-polyphenol-extract-on-renal-inflammation-associated-with-aberrant-energy-metabolism-and-oxidative-stress-in-high-fat-diet-induced-obese-mice
#12
Hyeyoon Eo, Ji Eun Park, You-Jin Jeon, Yunsook Lim
Immoderate fat accumulation causes both oxidative stress and inflammation, which can induce kidney damage in obesity. Previously, Ecklonia cava has shown anti-inflammatory and antioxidative effects. Our group aimed to investigate whether E. cava polyphenol extract (ECPE) improves renal damage in high fat diet (HFD)-induced obese mice through regulation of not only energy metabolism but also oxidative stress and inflammation. After obesity induction by HFD, the mice were treated with different dosages of ECPE (100 or 500 mg/kg/day) by gavage for 12 weeks...
May 5, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/28458100/inhibition-of-neuroinflammation-by-thymoquinone-requires-activation-of-nrf2-are-signalling
#13
Ravikanth Velagapudi, Asit Kumar, Harsharan S Bhatia, Abdelmeneim El-Bakoush, Izabela Lepiarz, Bernd L Fiebich, Olumayokun A Olajide
Thymoquinone is an antioxidant phytochemical that has been shown to inhibit neuroinflammation. However, little is known about the potential roles of intracellular antioxidant signalling pathways in its anti-inflammatory activity. The objective of this study was to elucidate the roles played by activation of the Nrf2/ARE antioxidant mechanisms in the anti-inflammatory activity of this compound. Thymoquinone inhibited lipopolysaccharide (LPS)-induced neuroinflammation through interference with NF-κB signalling in BV2 microglia...
April 27, 2017: International Immunopharmacology
https://www.readbyqxmd.com/read/28456064/effects-of-diclofenac-on-the-expression-of-nrf2-and-its-downstream-target-genes-in-mosquito-fish-gambusia-affinis
#14
Shuang Bao, Xiangping Nie, Ruikang Ou, Chao Wang, Peijia Ku, Kaibing Li
Diclofenac (DCF) is one of widely used non-steroidal anti-inflammatory drugs. Recently, this drug has been universally detected in aquatic environment. However, its potential adverse effects and oxidative stress toxic mechanisms on fish remain unclear. In the present study, we first cloned the crucial partial sequences of some key oxidative stress related genes, which include NF-E2-related factor 2 (Nrf2), NAD(P)H: quinoneoxidoreductase (NQO1), glutamate-cysteine ligase catalytic subunit (GCLC), Cu-Zn superoxide dismutase (SOD2), catalase (CAT), alpha-glutathione S-transferase (GSTA), and UDP-glucuronosyltransferases (UGT) in mosquito fish (Gambusia affinis)...
April 20, 2017: Aquatic Toxicology
https://www.readbyqxmd.com/read/28450126/flavonolignan-2-3-dehydrosilydianin-activates-nrf2-and-upregulates-nad-p-h-quinone-oxidoreductase-1-in-hepa1c1c7-cells
#15
Lenka Roubalová, Albena T Dinkova-Kostova, David Biedermann, Vladimír Křen, Jitka Ulrichová, Jiří Vrba
Silybum marianum (milk thistle) is a medicinal plant used for the treatment of various liver disorders. This study examined whether the main flavonolignans from S. marianum (i.e. silybin, silychristin, silydianin) and their 2,3-dehydro derivatives (i.e. 2,3-dehydrosilybin, 2,3-dehydrosilychristin, 2,3-dehydrosilydianin) activate the Nrf2 pathway, which regulates the expression of genes encoding many cytoprotective enzymes, including NAD(P)H:quinone oxidoreductase 1 (NQO1). After 48h of exposure, 2,3-dehydrosilydianin at concentrations of 25μM and higher significantly elevated the activity of NQO1 in murine hepatoma Hepa1c1c7 cells...
April 24, 2017: Fitoterapia
https://www.readbyqxmd.com/read/28448964/antioxidant-and-hepatoprotective-effect-of-swertiamarin-on-carbon-tetrachloride-induced-hepatotoxicity-via-the-nrf2-ho-1-pathway
#16
Tao Wu, Jingjing Li, Yong Li, Hongping Song
BACKGROUND/AIMS: Swertiamarin (STM), the main bioactive component in Swertia mussotii Franch (Gentianaceae), has been shown to exert hepatoprotective effects on experimental liver injury. However, the effects and exact mechanisms of STM on carbon tetrachloride (CCl4) causing hepatotoxicity are still unknown. This study investigated the potential protective effects and mechanisms of STM on CCl4-induced liver injury in rats. METHODS: Adult male Sprague-Dawley (SD) rats were exposed to CCl4 with or without STM co-administration for consecutive eight weeks...
April 25, 2017: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/28432984/cigarette-smoke-extract-counteracts-atheroprotective-effects-of-high-laminar-flow-on-endothelial-function
#17
Sindy Giebe, Natalia Cockcroft, Katherine Hewitt, Melanie Brux, Anja Hofmann, Henning Morawietz, Coy Brunssen
Tobacco smoking and hemodynamic forces are key stimuli in the development of endothelial dysfunction and atherosclerosis. High laminar flow has an atheroprotective effect on the endothelium and leads to a reduced response of endothelial cells to cardiovascular risk factors compared to regions with disturbed or low laminar flow. We hypothesize that the atheroprotective effect of high laminar flow could delay the development of endothelial dysfunction caused by cigarette smoking. Primary human endothelial cells were stimulated with increasing dosages of aqueous cigarette smoke extract (CSEaq)...
April 7, 2017: Redox Biology
https://www.readbyqxmd.com/read/28427200/idh1-r132h-mutation-regulates-glioma-chemosensitivity-through-nrf2-pathway
#18
Kaishu Li, Leping Ouyang, Mingliang He, Ming Luo, Wangqing Cai, Yalin Tu, Rongbiao Pi, Anmin Liu
PURPOSE: Numerous studies have reported that glioma patients with isocitrate dehydrogenase 1(IDH1) R132H mutation are sensitive to temozolomide treatment. However, the mechanism of IDH1 mutations on the chemosensitivity of glioma remains unclear. In this study, we investigated the role and the potential mechanism of Nrf2 in IDH1 R132H-mediated drug resistance. METHODS: Wild type IDH1 (R132H-WT) and mutant IDH1 (R132H) plasmids were constructed. Stable U87 cells and U251 cells overexpressing IDH1 were generated...
April 25, 2017: Oncotarget
https://www.readbyqxmd.com/read/28421738/targeting-the-nrf2-amyloid-beta-liaison-in-alzheimer-s-disease-a-rational-approach
#19
Elena Simoni, Melania M Serafini, Roberta Caporaso, Chiara Marchetti, Marco Racchi, Anna Minarini, Manuela Bartolini, Cristina Lanni, Michela Rosini
Amyloid is a prominent feature of Alzheimer's disease (AD). Yet, a linear linkage between amyloid-β peptide (Aβ) and the disease onset and progression has recently been questioned. In this context, the crucial partnership between Aβ and Nrf2 pathways is acquiring paramount importance, offering prospects for deciphering the Aβ-centered disease network. Here, we report on a new class of antiaggregating agents rationally designed to simultaneously activate transcription-based antioxidant responses, whose lead 1 showed interesting properties in a preliminary investigation...
April 25, 2017: ACS Chemical Neuroscience
https://www.readbyqxmd.com/read/28416455/protection-from-cr-vi-induced-malignant-cell-transformation-and-tumorigenesis-of-cr-vi-transformed-cells-by-luteolin-through-nrf2-signaling
#20
Young-Ok Son, Poyil Pratheeshkumar, Yuting Wang, Donghern Kim, Zhuo Zhang, Xianglin Shi
Cr(VI) is a well known environmental carcinogen, but its mechanism of action and the measures required to mitigate its effects remain to be investigated. Our previous studies showed that exposure of human bronchial epithelial (BEAS-2B) cells to Cr(VI) caused malignant transformation, that these transformed cells progressed through tumorigenesis, and that luteolin, a natural compound, inhibited both of these processes. The present study investigates the underlying mechanisms by which luteolin protects cells against Cr(VI)-induced transformation and tumorigenesis...
April 14, 2017: Toxicology and Applied Pharmacology
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