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NADPH oxidase

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https://www.readbyqxmd.com/read/27932980/tnf-%C3%AE-induced-cpla2-expression-via-nadph-oxidase-reactive-oxygen-species-dependent-nf-%C3%AE%C2%BAb-cascade-on-human-pulmonary-alveolar-epithelial-cells
#1
Chih-Chung Lin, Wei-Ning Lin, Rou-Ling Cho, Chen-Yu Wang, Li-Der Hsiao, Chuen-Mao Yang
Tumor necrosis factor-α (TNF-α) triggers activation of cytosolic phospholipase A2 (cPLA2) and then enhancing the synthesis of prostaglandin (PG) in inflammatory diseases. However, the detailed mechanisms of TNF-α induced cPLA2 expression were not fully defined in human pulmonary alveolar epithelial cells (HPAEpiCs). We found that TNF-α-stimulated increases in cPLA2 mRNA (5.2 folds) and protein (3.9 folds) expression, promoter activity (4.3 folds), and PGE2 secretion (4.7 folds) in HPAEpiCs, determined by Western blot, real-time PCR, promoter activity assay and PGE2 ELISA kit...
2016: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/27932349/nadph-oxidase-2-and-atherothrombosis-insight-from-chronic-granulomatous-disease
#2
REVIEW
Francesco Violi, Roberto Carnevale, Lorenzo Loffredo, Pasquale Pignatelli, John I Gallin
The phagocytic cell enzyme NADPH oxidase-2 (Nox2) is critical for killing micro-organisms via production of reactive oxygen species and thus is a key element of the innate immune system. Nox2 is also detectable in endothelial cells and platelets where it has vasoconstrictive and aggregating properties, respectively. Patients with X-linked chronic granulomatous disease with hereditary Nox2 deficiency not only have impaired bacterial killing but, in association with loss of Nox2 function, also have enhanced carotid artery dilation, impaired platelet-related thrombosis, and reduced carotid atherosclerotic burden...
December 8, 2016: Arteriosclerosis, Thrombosis, and Vascular Biology
https://www.readbyqxmd.com/read/27932314/tis21-btg2-inhibits-doxorubicin-induced-stress-fiber-vimentin-networks-via-nox4-ros-abi2-drf-linked-signal-cascade
#3
In Kyoung Lim, Jung-A Choi, Eun Young Kim, Bit Na Kim, Soohyun Jang, Min Sook Ryu, Sang-Hee Shim
Activities of TIS21(/BTG2) gene regulating cancer cell senescence were investigated in hepatoma cells by using low dose doxorubicin (Doxo, 100ng/mL). Treatment of Huh7 cells with Doxo increased linear actin nucleation e.g., transverse arcs and ventral stress fibers, as opposed to loss of filopodia. The linear actin nucleation was accompanied with thick vimentin networks at periphery of the cells, when examined by super-resolution STED microscope. However, expression of TIS21 inhibited ABI2-DRF pathway by inhibiting DRF expression and reducing ABI2 protein stability...
December 5, 2016: Cellular Signalling
https://www.readbyqxmd.com/read/27932289/peroxiredoxin-6-in-the-repair-of-peroxidized-cell-membranes-and-cell-signaling
#4
REVIEW
Aron B Fisher
Peroxiredoxin 6 represents a widely distributed group of peroxiredoxins that contain a single conserved cysteine in the protein monomer (1-cys Prdx). The cys when oxidized to the sulfenic form is reduced with glutathione (GSH) catalyzed by the π isoform of GSH-S-transferase. Three enzymatic activities of the protein have been described:1) peroxidase with H2O2, short chain hydroperoxides and phospholipid hydroperoxides as substrates; 2) phospholipase A2 (PLA2); and 3) lysophosphatidylcholine acyl transferase (LPCAT)...
December 5, 2016: Archives of Biochemistry and Biophysics
https://www.readbyqxmd.com/read/27930931/deficiency-in-duox2-activity-alleviates-ileitis-in-gpx1-and-gpx2-knockout-mice-without-affecting-apoptosis-incidence-in-the-crypt-epithelium
#5
Fong-Fong Chu, R Steven Esworthy, James H Doroshow, Helmut Grasberger, Agnes Donko, Thomas L Leto, Qiang Gao, Binghui Shen
Mice deficient in glutathione peroxidase (GPx)-1 and -2 (GPx1(-/-)GPx2(-/-) double knockout or DKO mice) develop very-early-onset (VEO) ileocolitis, suggesting that lack of defense against reactive oxygen species (ROS) renders susceptibility to intestinal inflammation. Two members of ROS-generating NADPH oxidase family, NOX1 and DUOX2, are highly inducible in the intestinal epithelium. Previously, we reported that Nox1 deficiency ameliorated the pathology in DKO mice (Nox1-TKO). The role of Duox2 in ileocolitis of the DKO mice is evaluated here in Duoxa-TKO mice by breeding DKO mice with Duoxa(-/-) mice (Duoxa-TKO), which do not have Duox2 activity...
November 22, 2016: Redox Biology
https://www.readbyqxmd.com/read/27930351/hydrogen-peroxide-responsive-nanoparticle-reduces-myocardial-ischemia-reperfusion-injury
#6
Soochan Bae, Minhyung Park, Changsun Kang, Serkan Dilmen, Tae Hi Kang, Dong Goo Kang, Qingen Ke, Seung Uk Lee, Dongwon Lee, Peter M Kang
BACKGROUND: During myocardial ischemia/reperfusion (I/R), a large amount of reactive oxygen species (ROS) is produced. In particular, overproduction of hydrogen peroxide (H2O2) is considered to be a main cause of I/R-mediated tissue damage. We generated novel H2O2-responsive antioxidant polymer nanoparticles (PVAX and HPOX) that are able to target the site of ROS overproduction and attenuate the oxidative stress-associated diseases. In this study, nanoparticles were examined for their therapeutic effect on myocardial I/R injury...
November 14, 2016: Journal of the American Heart Association
https://www.readbyqxmd.com/read/27929749/critical-role-of-x-box-binding-protein-1-in-nadph-oxidase-4-triggered-cardiac-hypertrophy-is-mediated-by-receptor-interacting-protein-kinase-1
#7
Li Chen, Mingyue Zhao, Junli Li, Yu Wang, Qinxue Bao, Siyuan Wu, Xueqin Deng, Xiaoju Tang, Wenchao Wu, Xiaojing Liu
NADPH oxidase 4 (NOX4) and the NOX4-related redox signaling are implicated in cardiac hypertrophy. NOX4 is interrelated with endoplasmic reticulum stress (ERS). Spliced X-box binding protein 1 (Xbp1s) is a key mediator of ERS while its role in cardiac hypertrophy is still poorly understood. Recently, receptor interacting protein kinase 1(RIPK1) has been increasingly reported to be associated with ERS. Therefore, we aimed to test the hypothesis that Xbp1s mediates NOX4-triggered cardiac hypertrophy via RIPK1 signaling...
December 8, 2016: Cell Cycle
https://www.readbyqxmd.com/read/27926860/l-met-activates-arabidopsis-glr-ca-2-channels-upstream-of-ros-production-and-regulates-stomatal-movement
#8
Dongdong Kong, Heng-Cheng Hu, Eiji Okuma, Yuree Lee, Hui Sun Lee, Shintaro Munemasa, Daeshik Cho, Chuanli Ju, Leah Pedoeim, Barbara Rodriguez, Juan Wang, Wonpil Im, Yoshiyuki Murata, Zhen-Ming Pei, June M Kwak
Plant glutamate receptor homologs (GLRs) have long been proposed to function as ligand-gated Ca(2+) channels, but no in planta evidence has been provided. Here, we present genetic evidence that Arabidopsis GLR3.1 and GLR3.5 form Ca(2+) channels activated by L-methionine (L-Met) at physiological concentrations and regulate stomatal apertures and plant growth. The glr3.1/3.5 mutations resulted in a lower cytosolic Ca(2+) level, defective Ca(2+)-induced stomatal closure, and Ca(2+)-deficient growth disorder, all of which involved L-Met...
December 6, 2016: Cell Reports
https://www.readbyqxmd.com/read/27924932/nadph-oxidase-4-deficiency-increases-tubular-cell-death-during-acute-ischemic-reperfusion-injury
#9
Stellor Nlandu-Khodo, Romain Dissard, Udo Hasler, Matthias Schäfer, Haymo Pircher, Pidder Jansen-Durr, Karl Heinz Krause, Pierre-Yves Martin, Sophie de Seigneux
NADPH oxidase 4 (NOX4) is highly expressed in kidney proximal tubular cells. NOX4 constitutively produces hydrogen peroxide, which may regulate important pro-survival pathways. Renal ischemia reperfusion injury (IRI) is a classical model mimicking human ischemic acute tubular necrosis. We hypothesized that NOX4 plays a protective role in kidney IRI. In wild type (WT) animals subjected to IRI, NOX4 protein expression increased after 24 hours. NOX4 KO (knock-out) and WT littermates mice were subjected to IRI...
December 7, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27923636/the-impact-of-early-aerobic-exercise-on-brain-microvascular-alterations-induced-by-cerebral-hypoperfusion
#10
Marina Leardini-Tristão, Juliana Pereira Borges, Felipe Freitas, Raquel Rangel, Anissa Daliry, Eduardo Tibiriçá, Vanessa Estato
The therapeutic potential of early exercise training following cerebral hypoperfusion was investigated on brain perfusion and inflammation in rats with permanent bilateral occlusion of the common carotid arteries (2VO). Wistar rats were subjected to 2VO or sham surgery and each group was then subdivided randomly into sedentary orexercisegroups. Early exercise training was initiated after three days of 2VO or sham surgery and consisted of seven days of treadmill training (30 min/day at ∼60% of maximal exercise test), composing four groups: 1) Sham sedentary (Sham-Sed), 2) Sham exercised (Sham-Ex), 3) 2VO sedentary (2VO-Sed) and 4) 2VO exercised (2VO-Ex)...
December 3, 2016: Brain Research
https://www.readbyqxmd.com/read/27923233/efficacy-of-adipodren%C3%A2-in-reducing-interleukin-1-induced-lymphatic-endothelial-hyperpermeability
#11
Valerio Ciccone, Martina Monti, Giulia Antonini, Luisa Mattoli, Michela Burico, Francesca Marini, Anna Maidecchi, Lucia Morbidelli
Lymphatic leakage can be seen as a detrimental phenomenon associated with fluid retention and deposition as well as gain of weight. Moreover, lymphatic dysfunction is associated with an inflammatory environment and can be a substrate for other health conditions. A number of treatments can ameliorate lymphatic vasculature: natural substances have been used as treatment options particularly suitable for their consolidated effectiveness and safety profile. Here we report the protective effect of AdipoDren®, an association of a series of plant-derived natural complexes, on lymphatic endothelium permeability promoted by interleukin-1 beta (IL-1β) and the associated molecular mechanisms...
December 7, 2016: Journal of Vascular Research
https://www.readbyqxmd.com/read/27920123/selective-enhancement-of-insulin-sensitivity-in-the-endothelium-in-vivo-reveals-a-novel-proatherosclerotic-signalling-loop
#12
Hema Viswambharan, Nadira Y Yuldasheva, Anshuman Sengupta, Helen Imrie, Matthew C Gage, Natalie J Haywood, Andrew M Walker, Anna Skromna, Natalia Makova, Stacey L Galloway, Pooja Shah, Piruthivi Sukumar, Karen E Porter, Peter J Grant, Ajay M Shah, Celio X Santos, Jing Li, David J Beech, Stephen Wheatcroft, Richard M Cubbon, Mark T Kearney
RATIONALE: In the endothelium, insulin stimulates endothelial nitric oxide synthase (eNOS) to generate the anti-atherosclerotic signalling radical NO. Insulin resistant type 2 diabetes is associated with reduced NO availability and accelerated atherosclerosis. The effect of enhancing endothelial insulin sensitivity on NO availability is unclear. OBJECTIVE: To answer this question we generated a mouse with endothelial cell (EC)-specific over-expression of the human insulin receptor (hIRECO) using the Tie2 promoter-enhancer...
December 5, 2016: Circulation Research
https://www.readbyqxmd.com/read/27917630/a-novel-cybb-mutation-in-chronic-granulomatous-disease-in-iran
#13
Shaghayegh Tajik, Mohsen Badalzadeh, Mohammad Reza Fazlollahi, Massoud Houshmand, Fariborz Zandieh, Shamim Khandan, Zahra Pourpak
Chronic granulomatous disease (CGD) is a rare primary immunodeficiency disorder due to a genetic defect in one of the components of nicotinamide adenine dinucleotide phosphate (NADPH) oxidase complex. This complex is composed of membrane-bound gp91-phox and p22-phox subunits, and cytosolic subunits consisting of p47-phox, p67-phox, and p40-phox. A mutation in CYBB gene encoding gp91-phox located on chromosome Xp21.1, leads to X-linked CGD. Herein, we report a 4-year-old Iranian boy presented with episodes of recurrent fever, cervical lymphadenopathy, and abdominal abscesses...
October 2016: Iranian Journal of Allergy, Asthma, and Immunology
https://www.readbyqxmd.com/read/27916650/cardiac-oxidative-stress-in-diabetes-mechanisms-and-therapeutic-potential
#14
REVIEW
Alyssa Faria, Shanta J Persaud
Macrovascular complications of diabetes, including diabetic cardiovascular disease (CVD), occur through a number of hyperglycaemia-induced mechanisms that include generation of oxidative stress, accumulation of advanced glycation end-products (AGE) and activation of protein kinase C (PKC). Cardiac oxidative stress is associated with increased cardiac fibrosis and hypertrophy, and reduced cardiac performance and contractility, leading to severe cardiac dysfunction and potentially fatal cardiac events. It occurs under conditions of excessive synthesis of reactive oxygen species (ROS)...
December 1, 2016: Pharmacology & Therapeutics
https://www.readbyqxmd.com/read/27915400/the-pathophysiological-role-of-nox2-in-hypertension-and-organ-damage
#15
REVIEW
Maurizio Forte, Cristina Nocella, Elena De Falco, Silvia Palmerio, Leonardo Schirone, Valentina Valenti, Giacomo Frati, Roberto Carnevale, Sebastiano Sciarretta
NADPH oxidases (NOXs) represent one of the major sources of reactive oxygen species in the vascular district. Reactive oxygen species are responsible for vascular damage that leads to several cardiovascular pathological conditions. Among NOX isoforms, NOX2 is widely expressed in many cells types, such as cardiomyocytes, endothelial cells, and vascular smooth muscle cells, confirming its pivotal role in vascular pathophysiology. Studies in mice models with systemic deletion of NOX2, as well as in transgenic mice overexpressing NOX2, have demonstrated the undeniable involvement of NOX2 in the development of hypertension, atherosclerosis, diabetes mellitus, cardiac hypertrophy, platelet aggregation, and aging...
December 3, 2016: High Blood Pressure & Cardiovascular Prevention: the Official Journal of the Italian Society of Hypertension
https://www.readbyqxmd.com/read/27915246/neutrophil-dependent-pentraxin-3-and-reactive-oxygen-species-production-modulate-endothelial-dysfunction-in-haemodialysis-patients
#16
Maria Pia dell'Oglio, Simona Simone, Marco Ciccone, Roberto Corciulo, Michele Gesualdo, Annapaola Zito, Francesca Cortese, Giuseppe Castellano, Margherita Gigante, Loreto Gesualdo, Giuseppe Grandaliano, Giovanni Battista Pertosa
BACKGROUND: The aim of this study was to investigate neutrophil activation and its role in long pentraxin-3 (PTX3) release and oxidative stress generation during haemodialysis (HD) and to correlate neutrophil PTX3 and oxidant expression with endothelial dysfunction. METHODS: Forty-seven uraemic patients on stable HD, 12 healthy subjects and 15 patients with congestive heart failure (New York Heart Association classes III and IV) were enrolled. Neutrophil PTX3 protein expression was evaluated by confocal microscopy...
December 3, 2016: Nephrology, Dialysis, Transplantation
https://www.readbyqxmd.com/read/27914961/expanding-the-clinical-and-genetic-spectrum-of-g6pd-deficiency-the-occurrence-of-bcgitis-and-novel-missense-mutation
#17
Taj Ali Khan, Humaira Mazhar, Mehboob Nawaz, Kalsoom Kalsoom, Muhammad Ishfaq, Huma Asif, Hazir Rahman, Muhammad Qasim, Farkhanda Naz, Mubashir Hussain, Baharullah Khattak, Waheed Ullah, Otavio Cabral-Marques, Jawad Butt, Asif Iqbal
Glucose-6-phosphate dehydrogenase (G6PD) is a key enzyme in the pentose phosphate pathway that ensures sufficient production of coenzyme nicotinamide adenine dinucleotide phosphate (NADPH) by catalyzing the reduction of NADP+ to NADPH. Noteworthy, the latter mediates the production of reactive oxygen species (ROS) by phagocytic cells such as neutrophils and monocytes. Therefore, patients with severe forms of G6PD deficiency may present impaired NADPH oxidase activity and become susceptible to recurrent infections...
November 30, 2016: Microbial Pathogenesis
https://www.readbyqxmd.com/read/27913300/suppression-of-nadph-oxidase-attenuates-hypoxia-induced-dysfunctions-of-endothelial-progenitor-cells
#18
Bin Liu, Kai-Di Ren, Jing-Jie Peng, Tao Li, Xiu-Ju Luo, Chengming Fan, Jin-Fu Yang, Jun Peng
NADPH oxidases (NOX) - derived reactive oxygen species (ROS) contribute to oxidative injury in hypoxia-induced pulmonary arterial hypertension. This study aims to evaluate the status of NOX in endothelial progenitor cells (EPCs) under hypoxic condition and to determine whether NOX inhibitors could attenuate hypoxia-induced dysfunctions of EPCs. EPCs were isolated from peripheral blood of SD rats and subjected to hypoxia (O2/N2/CO2, 1/94/5) for 24 h. The cells were collected for β-galactosidase or Hoechst staining, or for functional analysis (migration, adhesion and tube formation)...
November 29, 2016: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/27913188/fructose-suppresses-uric-acid-excretion-to-the-intestinal-lumen-as-a-result-of-the-induction-of-oxidative-stress-by-nadph-oxidase-activation
#19
Chihiro Kaneko, Jiro Ogura, Shunichi Sasaki, Keisuke Okamoto, Masaki Kobayashi, Kaori Kuwayama, Katsuya Narumi, Ken Iseki
BACKGROUND: A high intake of fructose increases the risk for hyperuricemia. It has been reported that long-term fructose consumption suppressed renal uric acid excretion and increased serum uric acid level. However, the effect of single administration of fructose on excretion of uric acid has not been clarified. METHODS: We used male Wistar rats, which were orally administered fructose (5g/kg). Those rats were used in each experiment at 12h after administration...
November 29, 2016: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/27912212/knockdown-of-inhibitory-guanine-nucleotide-binding-protein-gi%C3%AE-2-by-antisense-oligodeoxynucleotides-attenuates-the-development-of-hypertension-and-tachycardia-in-spontaneously-hypertensive-rats
#20
Yousra Ali El-Basyuni, Yuan Li, Madhu B Anand-Srivastava
BACKGROUND: We previously showed that the levels of both Giα-2 and Giα-3 proteins were augmented in spontaneously hypertensive rats (SHRs) before the onset of hypertension. In addition, intraperitoneal injection of pertussis toxin, which inactivates both Giα proteins, prevented the development of hypertension in SHRs. The aim of the present study was to determine the specific contributions of Giα-2 and Giα-3 proteins to the development of hypertension. METHODS AND RESULTS: Antisense oligodeoxynucleotide of Giα-2 and Giα-3 encapsulated in PEG/DOTAP/DOPE cationic liposomes were administrated intravenously into 3-week-old prehypertensive SHRs and Wistar Kyoto rats, whereas the control Wistar Kyoto rats and SHRs received PBS, empty liposomes, or sense...
October 26, 2016: Journal of the American Heart Association
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