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NADPH oxidase

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https://www.readbyqxmd.com/read/28211114/magnesium-lithospermate-b-from-salvia-miltiorrhiza-bunge-ameliorates-aging-induced-renal-inflammation-and-senescence-via-nadph-oxidase-mediated-reactive-oxygen-generation
#1
Chan Hum Park, Sung Ho Shin, Eun Kyeong Lee, Dae Hyun Kim, Min-Jo Kim, Seong-Soo Roh, Takako Yokozawa, Hae Young Chung
The present study was conducted to examine whether magnesium lithospermate B (MLB) extracted from Salviae miltiorrhizae radix was renoprotective in pathways related to age-related oxidative stress in aged rats. Magnesium lithospermate B was orally administered at a dose of 2- or 8-mg/kg body weight for 16 consecutive days, and the effects were compared with those of vehicle in old and young rats. Magnesium lithospermate B administration to old rats ameliorated renal oxidative stress through reduction of reactive oxygen species...
February 16, 2017: Phytotherapy Research: PTR
https://www.readbyqxmd.com/read/28210753/puerarin-7-o-glucuronide-a-water-soluble-puerarin-metabolite-prevents-angiotensin-ii-induced-cardiomyocyte-hypertrophy-by-reducing-oxidative-stress
#2
Ning Hou, Bin Cai, Cai-Wen Ou, Zhen-Hui Zhang, Xia-Wen Liu, Mu Yuan, Gan-Jian Zhao, Shi-Ming Liu, Long-Gen Xiong, Jian-Dong Luo, Cheng-Feng Luo, Min-Sheng Chen
This study aimed to investigate the anti-oxidant and anti-hypertrophic effects of puerarin-7-O-glucuronide, a water-soluble puerarin metabolite. The anti-oxidant effects of puerarin-7-O-glucuronide were assessed by measurement of intracellular superoxide levels, total superoxide dismutase (SOD) activity, total anti-oxidant capacity, and glutathione (GSH)/glutathione disulfide (GSSG) ratio in cultured neonatal rat cardiomyocytes (NRCMs) stimulated with the xanthine oxidase (XO)/xanthine (X) system or angiotensin II...
February 16, 2017: Naunyn-Schmiedeberg's Archives of Pharmacology
https://www.readbyqxmd.com/read/28209797/roles-of-vascular-oxidative-stress-and-nitric-oxide-in-the-pathogenesis-of-atherosclerosis
#3
REVIEW
Ulrich Förstermann, Ning Xia, Huige Li
Major reactive oxygen species (ROS)-producing systems in vascular wall include NADPH (reduced form of nicotinamide adenine dinucleotide phosphate) oxidase, xanthine oxidase, the mitochondrial electron transport chain, and uncoupled endothelial nitric oxide (NO) synthase. ROS at moderate concentrations have important signaling roles under physiological conditions. Excessive or sustained ROS production, however, when exceeding the available antioxidant defense systems, leads to oxidative stress. Animal studies have provided compelling evidence demonstrating the roles of vascular oxidative stress and NO in atherosclerosis...
February 17, 2017: Circulation Research
https://www.readbyqxmd.com/read/28208054/high-glucose-induced-hypomethylation-promotes-binding-of-sp-1-to-myo-inositol-oxygenase-implication-in-the-pathobiology-of-diabetic-tubulopathy
#4
Isha Sharma, Rajesh K Dutta, Neel K Singh, Yashpal S Kanwar
The catabolic enzyme myo-inositol oxygenase (MIOX) is expressed in proximal tubules and up-regulated in the diabetic state. Previously, we reported its transcriptional and translation regulation by high glucose (HG), osmolytes, and fatty acids. However, its epigenetic regulation is unknown. Bisulfite sequencing revealed that both human and mouse MIOX promoters, enriched with CpG sites, are hypomethylated and unmethylated under HG ambience and hyperglycemic states associated with increased MIOX expression. Eletrophoretic mobility shift assays revealed increased binding of unmethylated oligos with nucleoproteins of cells maintained under HG...
February 13, 2017: American Journal of Pathology
https://www.readbyqxmd.com/read/28202687/oxidized-phagosomal-nox2-is-replenished-from-lysosomes
#5
Ilse Dingjan, Peter T A Linders, Luuk van den Bekerom, Maksim V Baranov, Partho Halder, Martin Ter Beest, Geert van den Bogaart
In dendritic cells, the NADPH oxidase 2 (NOX2) is recruited to the phagosomal membrane during antigen uptake. NOX2 produces reactive oxygen species (ROS) in the lumen of the phagosome which kill ingested pathogens, delay antigen breakdown and alter the peptide repertoire for presentation to T cells. How the integral membrane component of NOX2, cytochrome b558, traffics to phagosomes is incompletely understood. In this study, we show in dendritic cells derived from human blood-isolated monocytes that cytochrome b558 is initially recruited to the phagosome from the plasma membrane during phagosome formation...
February 15, 2017: Journal of Cell Science
https://www.readbyqxmd.com/read/28202386/paraquat-and-maneb-co-exposure-induces-noradrenergic-locus-coeruleus-neurodegeneration-through-nadph-oxidase-mediated-microglial-activation
#6
Liyan Hou, Cong Zhang, Ke Wang, Xiaofang Liu, Hongwei Wang, Yuning Che, Fuqiang Sun, Xueying Zhou, Xiulan Zhao, Qingshan Wang
Co-exposure to paraquat (PQ) and maneb (Mb) has been shown to increase the risk of Parkinson's disease (PD) and dopaminergic (DA) neurodegeneration in the substantia nigra pars compacta (SNpc) is observed in PQ and Mb-treated experimental animals. The loss of noradrenergic locus coeruleus (LC/NE) neurons in brainstem is a common feature shared by multiple neurodegenerative diseases, including PD. However, whether PQ and Mb is able to damage LC/NE neurons remains undefined. In this study, mice treated with combined PQ and Mb displayed progressive LC/NE neurodegeneration...
February 12, 2017: Toxicology
https://www.readbyqxmd.com/read/28200110/associations-between-genetic-variants-of-nadph-oxidase-related-genes-and-blood-pressure-responses-to-dietary-sodium-intervention-the-gensalt-study
#7
Xikun Han, Zunsong Hu, Jing Chen, Jianfeng Huang, Chen Huang, Fangchao Liu, Charles Gu, Xueli Yang, James E Hixson, Xiangfeng Lu, Laiyuan Wang, De-Pei Liu, Jiang He, Shufeng Chen, Dongfeng Gu
No abstract text is available yet for this article.
February 14, 2017: American Journal of Hypertension
https://www.readbyqxmd.com/read/28196727/nrf2-mediates-redox-adaptation-in-nox4-overexpressed-non-small-cell-lung-cancer-cells
#8
Qipeng Wu, Bei Yao, Ning Li, Lei Ma, Yanchao Deng, Yang Yang, Cheng Zeng, Zhicheng Yang, Bing Liu
The redox adaptation mechanisms in cancer cells are very complex and remain largely unclear. Our previous studies have confirmed that NADPH oxidase 4 (NOX4) is abundantly expressed in non-small cell lung cancer (NSCLC) and confers apoptosis resistance on NSCLC cells. However, the comprehensive mechanisms for NOX4-mediated oxidative resistance of cancer cells remain still undentified. The present study found that NOX4-derived H2O2 enhanced the nuclear factor erythroid 2-related factor 2 (Nrf2) stability via disruption of redox-dependent proteasomal degradation and stimulated its activity through activation of PI3K signaling...
February 11, 2017: Experimental Cell Research
https://www.readbyqxmd.com/read/28193546/contribution-of-guanine-nucleotide-exchange-factor-vav2-to-nlrp3-inflammasome-activation-in-mouse-podocytes-during-hyperhomocysteinemia
#9
Sabena M Conley, Justine M Abais-Battad, Xinxu Yuan, Qinghua Zhang, Krishna M Boini, Pin-Lan Li
NADPH oxidase (NOX)-derived reactive oxygen species (ROS) have been demonstrated to mediate the activation of NOD-like receptor protein 3 (NLRP3) inflammasomes in podocytes in response to elevated levels of homocysteine (Hcys). However, it remains unknown how NLRP3 inflammasome activation is triggered by NOX. The present study tested whether the guanine nucleotide exchange factor Vav2 mediates Rac1-mediated NOX activation in response to elevated Hcys leading to NLRP3 inflammasome activation in podocytes and consequent glomerular injury...
February 10, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28193327/cloning-expression-and-biochemical-characterization-of-a-novel-nadp-dependent-7%C3%AE-hydroxysteroid-dehydrogenase-from-clostridium-difficile-and-its-application-for-the-oxidation-of-bile-acids
#10
Daniel Bakonyi, Werner Hummel
A gene encoding a novel 7α-specific NADP(+)-dependent hydroxysteroid dehydrogenase from Clostridium difficile was cloned and heterologously expressed in Escherichia coli. The enzyme was purified using an N-terminal hexa-his-tag and biochemically characterized. The optimum temperature is at 60°C, but the enzyme is inactivated at this temperature with a half-life time of 5min. Contrary to other known 7α-HSDHs, for example from Clostridium sardiniense or E. coli, the enzyme from C. difficile does not display a substrate inhibition...
April 2017: Enzyme and Microbial Technology
https://www.readbyqxmd.com/read/28192231/hypotensive-and-vasorelaxant-effect-of-diapocynin-in-normotensive-rats
#11
Simone R Potje, Jéssica A Troiano, Murilo E Graton, Valdecir F Ximenes, Ana Claúdia M S Nakamune, Cristina Antoniali
Nicotinamide adenine dinucleotide phosphate oxidase (NAD(P)H-oxidase) is a multicomponent enzyme system that generates superoxide anion by one-electron reduction of molecular oxygen and represents the major source of reactive oxygen species (ROS) in the vascular cells. Apocynin has been extensively used as an inhibitor of NADPH oxidase (NOX) in phagocytic cells and as an antioxidant in non-phagocytic cells. In phagocytes cells, due to the presence of myeloperoxidase, apocynin can be the converted to diapocynin, which is supposed to be the active form of this phytochemical...
February 9, 2017: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/28192127/long-term-treatment-with-nandrolone-decanoate-impairs-mesenteric-vascular-relaxation-in-both-sedentary-and-exercised-female-rats
#12
Izabela F Caliman, Cristian S Bernabe, Antônio F de Melo, Girlândia A Brasil, Andrews M do Nascimento, Ewelyne M de Lima, Suely G Figueiredo, Tadeu U de Andrade, Nazaré S Bissoli
Nandrolone Decanoate (ND) is an Anabolic Androgenic Steroid (AAS) that under abusive regimen can lead to multiple physiological adverse effects. Studies of AAS-mediated cardiovascular (CV) alterations were mostly taken from male subjects, even though women are also susceptible to the effects of AAS and gender-specific differences in susceptibility to vascular diseases exist. Here we investigate ND-induced vascular reactivity alterations in both sedentary and exercised female rats and whether these alterations depend on endothelium-derived factors...
February 9, 2017: Steroids
https://www.readbyqxmd.com/read/28191009/defective-il-23-il-17-axis-protects-p47phox-mice-from-colon-cancer
#13
Cornelia Richter, Martina Herrero San Juan, Benno Weigmann, Dominik Bergis, Katrin Dauber, Michael H Muders, Gustavo B Baretton, Josef Martin Pfeilschifter, Halvard Bonig, Sebastian Brenner, Heinfried H Radeke
In the colon, a sophisticated balance between immune reaction and tolerance is absolutely required. Dysfunction may lead to pathologic phenotypes ranging from chronic inflammatory processes to cancer development. Two prominent modulators of colon inflammation are represented by the closely related cytokines interleukin (IL)-12 and IL-23, which initiate adaptive Th1 and Th17 immune responses, respectively. In this study, we investigated the impact of the NADPH oxidase protein p47phox, which negatively regulates IL-12 in dendritic cells, on colon cancer development in a colitis-associated colon cancer model...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28188286/hydrogen-sulfide-inhibits-high-glucose-induced-nadph-oxidase-4-expression-and-matrix-increment-by-recruiting-inducible-nitric-oxide-synthase-in-the-kidney-proximal-tubular-epithelial-cells
#14
Hak Joo Lee, Doug Yoon Lee, Meenalakshmi M Mariappan, Denis Feliers, Goutam Ghosh Choudhury, Hanna E Abboud, Yves Gorin, Balakuntalam S Kasinath
High glucose increases NADPH oxidase 4 (NOX4) expression, reactive oxygen species (ROS) generation, and, matrix protein synthesis by inhibiting AMP-activated protein kinase (AMPK) in renal cells. Since hydrogen sulfide (H2S) inhibits high glucose-induced matrix protein increment by activating AMPK in renal cells, we examined if H2S inhibits high glucose induced expression of NOX4 and matrix protein and if H2S nitric oxide (NO) pathways are integrated. High glucose increased NOX4 expression and activity at 24 h in renal proximal tubular epithelial cells that was inhibited by sodium hydrosulfide (NaHS), a source of H2S...
February 10, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28187742/regulatory-role-of-cytosolic-phospholipase-a2-alpha-in-the-induction-of-cd40-in-microglia
#15
Yafa Fetfet Malada-Edelstein, Nurit Hadad, Rachel Levy
BACKGROUND: The aberrant expression of CD40, a co-stimulatory receptor found on the antigen-presenting cells, is involved in the pathogenesis of various degenerative diseases. Our previous study demonstrated that the reduction of cytosolic phospholipase A2 alpha (cPLA2α) protein overexpression and activation in the spinal cord of a mouse model of ALS, hmSOD1 G93A, inhibited CD40 upregulation in microglia. The present study was designed to determine whether cPLA2α has a direct, participatory role in the molecular events leading to CD40 induction...
February 10, 2017: Journal of Neuroinflammation
https://www.readbyqxmd.com/read/28187163/enhanced-survival-of-leishmania-major-in-neutrophil-granulocytes-in-the-presence-of-apoptotic-cells
#16
Natallia Salei, Lars Hellberg, Jörg Köhl, Tamás Laskay
Neutrophil granulocytes are the first leukocytes that encounter and phagocytose Leishmania major (L. major) parasites in the infected skin. The parasites can nonetheless survive within neutrophils. However, the mechanisms enabling the survival of Leishmania within neutrophils are still elusive. Previous findings indicated that human neutrophils can engulf apoptotic cells. Since apoptotic neutrophils are abundant in infected tissues, we hypothesized that the uptake of apoptotic cells results in diminished anti-leishmanial activity and, consequently, contributes to enhanced survival of the parasites at the site of infection...
2017: PloS One
https://www.readbyqxmd.com/read/28185955/endothelial-nox4-based-nadph-oxidase-regulates-atherosclerosis-via-soluble-epoxide-hydrolase
#17
Pingping Hu, Xiaojuan Wu, Alok R Khandelwal, Weimin Yu, Zaicheng Xu, Lili Chen, Jian Yang, Robert M Weisbrod, Kin Sing Stephen Lee, Francesca Seta, Bruce D Hammock, Richard A Cohen, Chunyu Zeng, Xiaoyong Tong
: Nox4-based NADPH oxidase is a major reactive oxygen species-generating enzyme in the vasculature, but its role in atherosclerosis remains controversial. OBJECTIVE: Our goal was to investigate the mechanisms of endothelial Nox4 in regulating atherosclerosis. APPROACH AND RESULTS: Atherosclerosis-prone conditions (disturbed blood flow, type I diabetes, and Western diet) downregulated endothelial Nox4 mRNA in arteries. To address whether the downregulated endothelial Nox4 was directly involved in the development of atherosclerosis, we generated mice carrying a human Nox4 P437H dominant negative mutation (Nox4DN), driven by the endothelial specific promoter Tie-2, on atherosclerosis-prone genetic background (ApoE deficient mice) to mimic the effect of decreased endothelial Nox4...
February 6, 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28182798/expression-of-genes-belonging-to-the-interacting-tlr-cascades-nadph-oxidase-and-mitochondrial-oxidative-phosphorylation-in-septic-patients
#18
Laura A Nucci, Sidnéia S Santos, Milena K C Brunialti, Narendra Kumar Sharma, Flavia R Machado, Murillo Assunção, Luciano C P de Azevedo, Reinaldo Salomao
BACKGROUND AND OBJECTIVES: Sepsis is a complex disease that is characterized by activation and inhibition of different cell signaling pathways according to the disease stage. Here, we evaluated genes involved in the TLR signaling pathway, oxidative phosphorylation and oxidative metabolism, aiming to assess their interactions and resulting cell functions and pathways that are disturbed in septic patients. MATERIALS AND METHODS: Blood samples were obtained from 16 patients with sepsis secondary to community acquired pneumonia at admission (D0), and after 7 days (D7, N = 10) of therapy...
2017: PloS One
https://www.readbyqxmd.com/read/28181912/the-role-of-oxidative-stress-and-nadph-oxidase-in-the-pathogenesis-of-atherosclerosis
#19
Dorota Bryk, Wioletta Olejarz, Danuta Zapolska-Downar
Reactive oxygen species (ROS) play a key role in the pathogenesis of atherosclerosis. The main mechanisms which are involved are low-density lipoprotein oxidative modification, inactivation of nitric oxide and modulation of redox-sensitive signaling pathways. ROS contribute to several aspects of atherosclerosis including endothelial cell dysfunction, monocyte/macrophage recruitment and activation, stimulation of inflammation, and inducing smooth muscle cell migration and proliferation. NADPH oxidase is the main source of ROS in the vasculature...
January 28, 2017: Postȩpy Higieny i Medycyny Doświadczalnej
https://www.readbyqxmd.com/read/28179303/sirna-based-analysis-of-the-abrogation-of-the-protective-function-of-membrane-associated-catalase-of-tumor-cells
#20
Georg Bauer
Tumor cells, in contrast to non-malignant cells, show sustained expression of membrane-associated NADPH oxidase-1 and therefore generate extracellular superoxide anions and their dismutation product H2O2 In order to prevent intercellular reactive oxygen species/reactive nitrogen species (ROS/RNS)-dependent apoptosis-inducing signaling, tumor cells need to express membrane-associated catalase that interferes with HOCl and nitric oxide/peroxynitrite signaling. Catalase is attached to tumor cells through the activity of transglutaminase-2 and is prevented from superoxide anion-dependent inhibition through coexpression of membrane-associated superoxide dismutase...
2017: Anticancer Research
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