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NAD AND NQO1

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https://www.readbyqxmd.com/read/28028389/short-term-exposure-to-50-hz-electromagnetic-field-and-alterations-in-nqo1-and-nqo2-expression-in-mcf-7-cells
#1
Hamideh Mahmoudinasab, Mostafa Saadat
AIM: Extremely low-frequency electromagnetic fields (ELF-EMFs) have some genotoxic effects and it may alter the mRNA levels of antioxidant genes. The NAD(P)H: quinone oxidoreductase-1 (NQO1) and NQO2 are ubiquitously expressed. Considering that there is no published data on the effect(s) of ELF-EMF (50-Hz) exposure and expression levels of NQO1 and NQO2 in the human MCF-7 cells, the present study was carried out. METHODS: The ELF-EMF (0.25 and 0.50 mT) exposure patterns were: 5 min field-on/5 min filed-off, 15 min field-on/15 min field-off, and 30 min field-on continuously...
December 15, 2016: Open Access Macedonian Journal of Medical Sciences
https://www.readbyqxmd.com/read/28025122/protective-effect-of-rutaecarpine-against-t-bhp-induced-hepatotoxicity-by-upregulating-antioxidant-enzymes-via-the-camkii-akt-and-nrf2-are-pathways
#2
Sun Woo Jin, Yong Pil Hwang, Chul Yung Choi, Hyung Gyun Kim, Se Jong Kim, Yongan Kim, Young Chul Chung, Kyung Jin Lee, Tae Cheon Jeong, Hye Gwang Jeong
Rutaecarpine, an indolopyridoquinazolinone alkaloid isolated from the unripe fruit of Evodia rutaecarpa, has been shown to have cytoprotective potential, but the molecular mechanism underlying this activity remains unclear. Our study was designed to investigate the cytoprotective effect of rutaecarpine against tert-butyl hydroperoxide (t-BHP) and to elucidate its action mechanism of action of rutaecarpine in a cultured HepG2 cell line and in mouse liver. Rutaecarpine decreased t-BHP-induced reactive oxygen species (ROS) production, cytotoxicity, and apoptosis in HepG2 cells...
December 23, 2016: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28006669/alkynyloxy-derivatives-of-5-8-quinolinedione-synthesis-in%C3%A2-vitro-cytotoxicity-studies-and-computational-molecular-modeling-with-nad-p-h-quinone-oxidoreductase-1
#3
Monika Kadela-Tomanek, Maria Jastrzębska, Bartosz Pawełczak, Ewa Bębenek, Elwira Chrobak, Małgorzata Latocha, Maria Książek, Joachim Kusz, Stanisław Boryczka
The natural 7-amino-5,8-quinolinodione antibiotics were the substrate for the NQO1 protein. The structure-activity relationship showed that the 5,8-quinolinedione moiety was responsible for the interaction with the enzyme. In our research, we presented the synthesis, cytotoxic activity and theoretical study of a 5,8-quinolinedione compound as a potential inhibitor of the NQO1 enzyme. Mono and disubstituted alkynyloxy derivatives of the 5,8-quinolinedione were synthesized and characterized by (1)H, (13)C NMR, IR and HR-MS spectra...
December 15, 2016: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28000977/silac-based-quantitative-proteomic-analysis-reveals-widespread-molecular-alterations-in-human-skin-keratinocytes-upon-chronic-arsenic-exposure
#4
Sartaj Ahmad Mir, Sneha M Pinto, Somnath Paul, Remya Raja, Vishalakshi Nanjappa, Nazia Syed, Jayshree Advani, Santosh Renuse, Nandini A Sahasrabuddhe, T S Keshava Prasad, Ashok K Giri, Harsha Gowda, Aditi Chatterjee
Chronic exposure to arsenic is associated with dermatological and nondermatological disorders. Consumption of arsenic-contaminated drinking water results in accumulation of arsenic in liver, spleen, kidneys, lungs, and gastrointestinal tract. Although arsenic is cleared from these sites, a substantial amount of residual arsenic is left in keratin-rich tissues including skin. Epidemiological studies suggest the association of skin cancer upon arsenic exposure, however, the mechanism of arsenic-induced carcinogenesis is not completely understood...
October 19, 2016: Proteomics
https://www.readbyqxmd.com/read/28000844/cytoprotective-effects-of-esculetin-against-oxidative-stress-are-associated-with-the-upregulation-of-nrf2-mediated-nqo1-expression-via-the-activation-of-the-erk-pathway
#5
Min Ho Han, Cheol Park, Dae-Sung Lee, Su-Hyun Hong, Il-Whan Choi, Gi-Young Kim, Sung Hyun Choi, Jung-Hyun Shim, Jung-Il Chae, Young Hyun Yoo, Yung Hyun Choi
Esculetin, a coumarin derivative isolated from a variety of medicinal herbs, has been reported to possess multiple therapeutic and pharmacological actions. Although several studies have demonstrated the antioxidant activity of esculetin, its mechanisms of action have not been clearly established. The aim of this study was to evaluate the effects of esculetin against hydrogen peroxide (H2O2)‑induced oxidative stress in C2C12 myoblasts and to investigate the mechanisms involved in this process. Our data indicated that esculetin preconditioning significantly attenuated H2O2‑induced growth inhibition and DNA damage and the apoptosis of C2C12 cells by suppressing intracellular reactive oxygen species (ROS) accumulation...
February 2017: International Journal of Molecular Medicine
https://www.readbyqxmd.com/read/27986568/distinct-responses-of-compartmentalized-glutathione-redox-potentials-to-pharmacologic-quinones-targeting-nqo1
#6
Vladimir L Kolossov, Nagendraprabhu Ponnuraj, Jessica N Beaudoin, Matthew T Leslie, Paul J Kenis, H Rex Gaskins
Deoxynyboquinone (DNQ), a potent novel quinone-based antineoplastic agent, selectively kills solid cancers with overexpressed cytosolic NAD(P)H:quinone oxidoreductase-1 (NQO1) via excessive ROS production. A genetically encoded redox-sensitive probe was used to monitor intraorganellar glutathione redox potentials (EGSH) as a direct indicator of cellular oxidative stress following chemotherapeutic administration. Beta-lapachone (β-lap) and DNQ-induced spatiotemporal redox responses were monitored in human lung A549 and pancreatic MIA-PaCa-2 adenocarcinoma cells incubated with or without dicumarol and ES936, potent NQO1 inhibitors...
December 14, 2016: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/27975234/pharmacokinetics-and-derivation-of-an-anticancer-dosing-regimen-for-the-novel-anti-cancer-agent-isobutyl-deoxynyboquinone-ib-dnq-a-nqo1-bioactivatable-molecule-in-the-domestic-felid-species
#7
Alycen P Lundberg, Joshua M Francis, Malgorzata Pajak, Elizabeth I Parkinson, Kathryn L Wycislo, Thomas J Rosol, Megan E Brown, Cheryl A London, Levent Dirikolu, Paul J Hergenrother, Timothy M Fan
Isobutyl-deoxynyboquinone (IB-DNQ) is a selective substrate for NAD(P)H:quinone oxidoreductase (NQO1), an enzyme overexpressed in many solid tumors. Following activation by NQO1, IB-DNQ participates in a catalytic futile reduction/reoxidation cycle with consequent toxic reactive oxygen species generation within the tumor microenvironment. To elucidate the potential of IB-DNQ to serve as a novel anticancer agent, in vitro studies coupled with in vivo pharmacokinetic and toxicologic investigations in the domestic felid species were conducted to investigate the tractability of IB-DNQ as a translationally applicable anticancer agent...
December 14, 2016: Investigational New Drugs
https://www.readbyqxmd.com/read/27973423/regressive-effect-of-myricetin-on-hepatic-steatosis-in-mice-fed-a-high-fat-diet
#8
Shu-Fang Xia, Guo-Wei Le, Peng Wang, Yu-Yu Qiu, Yu-Yu Jiang, Xue Tang
Myricetin is an effective antioxidant in the treatment of obesity and obesity-related metabolic disorders. The objective of this study was to explore the regressive effect of myricetin on pre-existing hepatic steatosis induced by high-fat diet (HFD). C57BL/6 mice were fed either a standard diet or a HFD for 12 weeks and then half of the mice were treated with myricetin (0.12% in the diet, w/w) while on their respective diets for further 12 weeks. Myricetin treatment significantly alleviated HFD-induced steatosis, decreased hepatic lipid accumulation and thiobarbituric acid reactive substance (TBARS) levels, and increased antioxidative enzyme activities, including catalase (CAT), superoxide dismutase (SOD), and glutathione peroxidase (GPx) activities...
December 11, 2016: Nutrients
https://www.readbyqxmd.com/read/27960087/leveraging-an-nqo1-bioactivatable-drug-for-tumor-selective-use-of-poly-adp-ribose-polymerase-inhibitors
#9
Xiumei Huang, Edward A Motea, Zachary R Moore, Jun Yao, Ying Dong, Gaurab Chakrabarti, Jessica A Kilgore, Molly A Silvers, Praveen L Patidar, Agnieszka Cholka, Farjana Fattah, Yoonjeong Cha, Glenda G Anderson, Rebecca Kusko, Michael Peyton, Jingsheng Yan, Xian-Jin Xie, Venetia Sarode, Noelle S Williams, John D Minna, Muhammad Beg, David E Gerber, Erik A Bey, David A Boothman
Therapeutic drugs that block DNA repair, including poly(ADP-ribose) polymerase (PARP) inhibitors, fail due to lack of tumor-selectivity. When PARP inhibitors and β-lapachone are combined, synergistic antitumor activity results from sustained NAD(P)H levels that refuel NQO1-dependent futile redox drug recycling. Significant oxygen-consumption-rate/reactive oxygen species cause dramatic DNA lesion increases that are not repaired due to PARP inhibition. In NQO1(+) cancers, such as non-small-cell lung, pancreatic, and breast cancers, cell death mechanism switches from PARP1 hyperactivation-mediated programmed necrosis with β-lapachone monotherapy to synergistic tumor-selective, caspase-dependent apoptosis with PARP inhibitors and β-lapachone...
December 12, 2016: Cancer Cell
https://www.readbyqxmd.com/read/27913299/the-inhibitory-effect-of-beta-lapachone-on-rankl-induced-osteoclastogenesis
#10
Dong Ryun Gu, Joon No Lee, Gi-Su Oh, Hyung Jin Kim, Min Seuk Kim, Seoung Hoon Lee
β-lapachone (β-L) is a substrate of reduced nicotinamide adenine dinucleotide (NADH): quinone oxidoreductase 1 (NQO1). NQO1 reduces quinones to hydroquinones using NADH as an electron donor and consequently increases the intracellular NAD+/NADH ratio. The activation of NQO1 by β-L has beneficial effects on several metabolic syndromes, such as obesity, hypertension, and renal injury. However, the effect of β-L on bone metabolism remains unclear. Here, we show that β-L might be a potent inhibitor of receptor activator of nuclear factor-κB ligand (RANKL)-induced osteoclastogenesis...
January 22, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/27912883/miltirone-protects-human-ea-hy926-endothelial-cells-from-oxidized-low-density-lipoprotein-derived-oxidative-stress-via-a-heme-oxygenase-1-and-mapk-nrf2-dependent-pathway
#11
Liu Zhang, Hui Zhang, Xueyan Li, Bingjie Jia, Yuyu Yang, Ping Zhou, Ping Li, Jun Chen
BACKGROUND: Oxidized low-density lipoprotein (ox-LDL) is an underlying cause of endothelial dysfunction, which is an early event in the pathogenesis of atherosclerosis. In our previous study, we established an ARE-driven luciferase reporter system and screened out several potential Nrf2 activators from Salvia miltiorrhiza Bunge. PURPOSE: Since miltirone showed the most potent ARE-driven luciferase activity, the aim of this study was to test the protective role of miltirone against oxidative stress in endothelial cell and to investigate the underlying mechanistic signaling pathways...
December 15, 2016: Phytomedicine: International Journal of Phytotherapy and Phytopharmacology
https://www.readbyqxmd.com/read/27903425/activation-of-akt-and-jnk-nrf2-nqo1-pathway-contributes-to-the-protective-effect-of-coptisine-against-aaph-induced-oxidative-stress
#12
Yin-Ran Hu, Hang Ma, Zong-Yao Zou, Kai He, Yu-Bo Xiao, Yue Wang, Min Feng, Xiao-Li Ye, Xue-Gang Li
Coptisine (COP) is one of the main active constituents of Coptidis Rhizoma. Previous studies have clarified that COP possesses antioxidant activity, but its defensive effects against pathological characteristics accompanied by oxidative damage in animal models and antioxidant mechanism are still unclear. Therefore, our purpose was to confirm the antioxidant activity of COP and explore its mechanism of action. We first detected the effects of COP on intracellular reactive oxygen species (ROS), heart beating rate, lipid peroxidation and cell death in zebrafish model with AAPH-induced oxidative stress...
January 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/27888691/redox-imbalance-and-mitochondrial-abnormalities-in-the-diabetic-lung
#13
Jinzi Wu, Zhen Jin, Liang-Jun Yan
Although the lung is one of the least studied organs in diabetes, increasing evidence indicates that it is an inevitable target of diabetic complications. Nevertheless, the underlying biochemical mechanisms of lung injury in diabetes remain largely unexplored. Given that redox imbalance, oxidative stress, and mitochondrial dysfunction have been implicated in diabetic tissue injury, we set out to investigate mechanisms of lung injury in diabetes. The objective of this study was to evaluate NADH/NAD(+) redox status, oxidative stress, and mitochondrial abnormalities in the diabetic lung...
November 17, 2016: Redox Biology
https://www.readbyqxmd.com/read/27884351/in%C3%A2-vivo-imaging-of-antioxidant-response-element-activity-during-liver-regeneration-after-partial-hepatectomy
#14
Patrick Hamid Alizai, Lea Bertram, Athanassios Fragoulis, Christoph J Wruck, Daniela C Kroy, Uwe Klinge, Ulf P Neumann, Maximilian Schmeding
BACKGROUND: The nuclear factor-erythroid 2-related factor 2 (Nrf2) -antioxidant response element (ARE) pathway is important for the regulation of antioxidative stress response and detoxification. To activate the expression of its target genes, such as heme oxygenase-1 (HO-1) and NAD(P)H dehydrogenase (quinone) 1 (NQO1), Nrf2 binds to the ARE within the promoter region of these genes. Partial hepatectomy and consecutive liver regeneration lead to oxidative stress with activation of the Nrf2-ARE pathway...
December 2016: Journal of Surgical Research
https://www.readbyqxmd.com/read/27867096/ptgr1-expression-is-regulated-by-nrf2-in-rat-hepatocarcinogenesis-and-promotes-cell-proliferation-and-resistance-to-oxidative-stress
#15
Ricardo Sánchez-Rodríguez, Julia Esperanza Torres-Mena, Valeria Quintanar-Jurado, Victoria Chagoya-Hazas, Emilio Rojas Del Castillo, Luis Del Pozo Yauner, Saul Villa-Treviño, Julio Isael Pérez-Carreón
Prostaglandin reductase-1 (Ptgr1) is an alkenal/one oxidoreductase that is involved in the catabolism of eicosanoids and lipid peroxidation such as 4-hydroxynonenal (4-HNE). Recently, we reported that Ptgr1 is overexpressed in human clinical and experimentally induced samples of hepatocellular carcinoma (HCC). However, how the expression of this gene is regulated and its role in carcinogenesis are not yet known. Here, we studied parameters associated with antioxidant responses and the mechanisms underlying the induction of Ptgr1 expression by the activation of Nuclear Factor (erythroid-derived-2)-like-2 (NRF2)...
January 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/27860235/a-functional-pseudogene-nmral2p-is-regulated-by-nrf2-and-serves-as-a-coactivator-of-nqo1-in-sulforaphane-treated-colon-cancer-cells
#16
Gavin S Johnson, Jia Li, Laura M Beaver, W Mohaiza Dashwood, Deqiang Sun, Praveen Rajendran, David E Williams, Emily Ho, Roderick H Dashwood
SCOPE: The anticancer agent sulforaphane (SFN) acts via multiple mechanisms to modulate gene expression, including the induction of nuclear factor (erythroid-derived 2)-like 2 (Nrf2)-dependent signaling and the inhibition of histone deacetylase activity. Transcriptomics studies were performed in SFN-treated human colon cancer cells and in nontransformed colonic epithelial cells in order to pursue new mechanistic leads. METHODS AND RESULTS: RNA-sequencing corroborated the expected changes in cancer-related pathways after SFN treatment...
November 18, 2016: Molecular Nutrition & Food Research
https://www.readbyqxmd.com/read/27829520/affinity-based-small-fluorescent-probe-for-nad-p-h-quinone-oxidoreductase-1-nqo1-design-synthesis-and-pharmacological-evaluation
#17
Jinlei Bian, Xiang Li, Lili Xu, Nan Wang, Xue Qian, Qidong You, Xiaojin Zhang
NQO1 is a dimeric flavoprotein which intimately associated with cancer and overexpressed in the cytosol of numerous human tumor cells. Given that the cellular environment is quite dynamic and versatile, further investigation of the function of NQO1 depends on tools for specific detection of it. Currently, several activity-based assays have been developed to detect NQO1-expressing cancerous tissues. Herein, we report the development of a functional affinity-based small-molecule probe which is composed of a potent small-molecule NQO1 inhibitor 3d as the recognition group, a linker and the fluorophores group FITC...
November 1, 2016: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/27822011/ursolic-acid-sensitizes-cisplatin-resistant-hepg2-ddp-cells-to-cisplatin-via-inhibiting-nrf2-are-pathway
#18
Shouhai Wu, Tianpeng Zhang, Jingsheng Du
BACKGROUND: Combinations of adjuvant sensitizers with anticancer drugs is a promising new strategy to reverse chemoresistance. Ursolic acid (UA) is one of the natural pentacyclic triterpene compounds known to have many pharmacological characteristics such as anti-inflammatory and anticancer properties. This study investigates whether UA can sensitize hepatocellular carcinoma cells to cisplatin. MATERIALS AND METHODS: Cells were transfected with nuclear factor erythroid-2-related factor 2 (Nrf2) small interfering RNA and Nrf2 complementary DNA by using Lipofectin 2000...
2016: Drug Design, Development and Therapy
https://www.readbyqxmd.com/read/27790277/increased-cellular-nad-level-through-nqo1-enzymatic-action-has-protective-effects-on-bleomycin-induced-lung-fibrosis-in-mice
#19
Gi-Su Oh, Su-Bin Lee, Anjani Karna, Hyung-Jin Kim, AiHua Shen, Arpana Pandit, SeungHoon Lee, Sei-Hoon Yang, Hong-Seob So
BACKGROUND: Idiopathic pulmonary fibrosis is a common interstitial lung disease; it is a chronic, progressive, and fatal lung disease of unknown etiology. Over the last two decades, knowledge about the underlying mechanisms of pulmonary fibrosis has improved markedly and facilitated the identification of potential targets for novel therapies. However, despite the large number of antifibrotic drugs being described in experimental pre-clinical studies, the translation of these findings into clinical practices has not been accomplished yet...
October 2016: Tuberculosis and Respiratory Diseases
https://www.readbyqxmd.com/read/27777014/semisynthetic-flavonoid-7-o-galloylquercetin-activates-nrf2-and%C3%A2-induces-nrf2-dependent-gene-expression-in-raw264-7-and%C3%A2-hepa1c1c7-cells
#20
Lenka Roubalová, David Biedermann, Barbora Papoušková, Jan Vacek, Marek Kuzma, Vladimír Křen, Jitka Ulrichová, Albena T Dinkova-Kostova, Jiří Vrba
The natural flavonoid quercetin is known to activate the transcription factor Nrf2, which regulates the expression of cytoprotective enzymes such as heme oxygenase-1 (HO-1) and NAD(P)H:quinone oxidoreductase 1 (NQO1). In this study, a novel semisynthetic flavonoid 7-O-galloylquercetin (or quercetin-7-gallate, 3) was prepared by direct galloylation of quercetin, and its effect on the Nrf2 pathway was examined. A luciferase reporter assay showed that 7-O-galloylquercetin, like quercetin, significantly activated transcription via the antioxidant response element in a stably transfected human AREc32 reporter cell line...
December 25, 2016: Chemico-biological Interactions
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