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Antioxidants & Redox Signaling

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https://www.readbyqxmd.com/read/28548540/nicotinamide-adenine-dinucleotide-nad-sup-sup-metabolism-and-neurodegeneration
#1
Mariana Pehar, Benjamin A Harlan, Kelby M Killoy, Marcelo R Vargas
SIGNIFICANCE: Nicotinamide adenine dinucleotide (NAD<sup>+</sup>) participates in redox reactions and NAD<sup>+</sup>-dependent signaling processes, which involve the cleavage of NAD<sup>+</sup> coupled to post-translational modifications of proteins or the production of second messengers. Either as a primary cause or as a secondary component of the pathogenic process, mitochondrial dysfunction and oxidative stress are prominent features of several neurodegenerative diseases...
May 26, 2017: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/28540740/the-incomplete-glutathione-puzzle-just-guessing-at-numbers-and-figures
#2
Marcel Deponte
SIGNIFICANCE: Glutathione metabolism is comparable to a jigsaw puzzle with too many pieces. It supposably comprises (i) the reduction of disulfides, hydroperoxides, sulfenic acids and nitrosothiols, (ii) the detoxification of aldehydes, xenobiotics and heavy metals, and (iii) the synthesis of eicosanoids, steroids and iron-sulfur clusters. Furthermore, glutathione affects oxidative protein folding and redox signaling. Here, I review the relevance of glutathione-dependent pathways with an emphasis on quantitative data...
May 25, 2017: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/28540736/effects-of-diesel-exhaust-on-cardiovascular-function-and-oxidative-stress
#3
Simon Wilson, Mark R Miller, David E Newby
SIGNIFICANCE: Air pollution is a major global health concern with the particulate matter (PM) being especially associated with marked increases in cardiovascular morbidity and mortality. Diesel exhaust emissions are a particularly rich source of the smallest sizes of PM ("fine" and "ultrafine") in urban environments, and it is these particles that are believed to be the most detrimental to cardiovascular health. Recent Advances: Controlled exposure studies to diesel exhaust in animals and man demonstrate alterations in blood pressure, heart rate, vascular tone, endothelial function, myocardial perfusion, thrombosis, atherogenesis and plaque stability...
May 25, 2017: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/28537489/hydrogen-sulfide-as-a-potential-target-in-preventing-spermatogenic-failure-and-testicular-dysfunction
#4
Jing Wang, Wan Wang, Shuangyue Li, Yi Han, Ping Zhang, Guoliang Meng, Yujiao Xiao, Liping Xie, Xin Wang, Jiahao Sha, Qi Chen, Philip K Moore, Rui Wang, Wenpei Xiang, Yong Ji
AIMS: Testis and sperm are particularly susceptible to inflammation and oxidative stress. Although Hydrogen sulfide (H2S) has been considered as an important biological signaling molecule in inflammatory and oxidative stress processes, its role in male reproductive system was poorly understood. The aim of this study was to investigate the role of H2S in the regulation of male reproductive system. RESULTS: We found that both sub-fertile and infertile patients, especially asthenospermic patients, exhibited a decreased concentration of H2S in their seminal plasma and diminished expression of H2S-generating enzyme (cystathionine β-synthase, CBS) in sperm...
May 24, 2017: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/28537433/aspirin-mediated-acetylation-protects-against-multiple-neurodegenerative-pathologies-by-impeding-protein-aggregation
#5
Srinivas Ayyadevara, Meenakshisundaram Balasubramaniam, Ramani Alla, J L Mehta, Robert J Shmookler Reis
AIMS: Many progressive neurological disorders, including Alzheimer's, Huntington's, and Parkinson's diseases, are characterized by accumulation of insoluble protein aggregates. In prospective trials, the cyclooxygenase inhibitor aspirin (acetylsalicylic acid) reduced the risk of Alzheimer's and Parkinson's diseases, as well as cardiovascular events and many late-onset cancers. In view of previous evidence that inflammation promotes protein hyperphosphorylation and aggregation in neurodegenerative diseases, we asked whether aspirin's known ability to block phosphorylation may be secondary to its acetylation of protein targets...
May 24, 2017: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/28537430/multifaceted-roles-of-glutathione-and-glutathione-based-systems-in-carcinogenesis-and-anticancer-drug-resistance
#6
Elie Hatem, Nadine El Banna, Meng-Er Huang
SIGNIFICANCE: Glutathione is the most abundant antioxidant molecule in living organisms and has multiple functions. Intracellular glutathione homeostasis, through its synthesis, consumption, and degradation is an intricately balanced process. Glutathione levels are often high in tumor cells prior to treatment and there is a strong correlation between elevated levels of intracellular glutathione/sustained glutathione-mediated redox activity and resistance to pro-oxidant anticancer therapy...
May 24, 2017: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/28537424/vascular-stem-progenitor-cell-migration-and-differentiation-in-atherosclerosis
#7
Baoqi Yu, Qishan Chen, Alexandra Le Bras, Li Zhang, Qingbo Xu
SIGNIFICANCE: Atherosclerosis is a major cause for the death of human beings, and takes place in large and middle-sized arteries. The pathogenesis of the disease has been widely investigated and new findings on vascular stem/progenitor cells could have impact on vascular regeneration. Recent Advances: Recent studies have shown that abundant stem/progenitor cells present in the vessel wall are mainly responsible for cell accumulation in the intima during vascular remodeling. It has been demonstrated that the mobilization and recruitment of tissue-resident stem/progenitor cells give rise to endothelial and smooth muscle cells, which participate in vascular repair and remodeling such as neointimal hyperplasia and arteriosclerosis...
May 24, 2017: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/28537421/glutathione-glutaredoxins-and-iron
#8
Carsten Berndt, Christopher Horst Lillig
SIGNIFICANCE: Glutathione is the most abundant cellular low molecular weight thiol in the majority of organisms in all kingdoms of life. Therefore, functions of glutathione and disturbed regulation of its concentration are associated with numerous physiological and pathological situations. Recent advances: The function of glutathione as redox buffer or antioxidant is increasingly being questioned. New functions, especially functions connected to the cellular iron homeostasis were elucidated...
May 24, 2017: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/28537420/nitration-and-glycation-turn-mature-ngf-into-a-toxic-factor-for-motor-neurons-a-role-for-p75-sup-ntr-sup-and-rage-signaling-in-als
#9
Mi Jin Kim, Marcelo R Vargas, Benjamin A Harlan, Kelby M Killoy, Lauren Ball, Susana Comte-Walters, Monika Gooz, Yasuhiko Yamamoto, Joseph S Beckman, Luis Barbeito, Mariana Pehar
Glycating stress can occur together with oxidative stress during neurodegeneration and contribute to the pathogenic mechanism. Nerve growth factor (NGF) accumulates in several neurodegenerative diseases. Besides promoting survival, NGF can paradoxically induce cell death by signaling through the p75 neurotrophin receptor (p75<sup>NTR</sup>). The ability of NGF to induce cell death is increased by nitration of its tyrosine residues under conditions associated with increased peroxynitrite formation...
May 24, 2017: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/28537416/glutathione-degradation
#10
Anand K Bachhawat, Amandeep Kaur
SIGNIFICANCE: Glutathione degradation has for long been thought to occur only on non-cytosolic pools. This is because there has been only one enzyme known to degrade glutathione (γ-glutamyltranspeptidase), and this localizes to either the plasma membrane (mammals, bacteria) or the vacuolar membrane (yeast, plants) and acts on extracellular or vacuolar pools. The last few years has seen the discovery of several new enzymes of glutathione degradation that function in the cytosol, throwing new light on glutathione degradation...
May 24, 2017: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/28117598/cr6-interacting-factor-1-deficiency-impairs-vascular-function-by-inhibiting-the-sirt1-endothelial-nitric-oxide-synthase-pathway
#11
Harsha Nagar, Saet-Byel Jung, Min Jeong Ryu, Su-Jung Choi, Shuyu Piao, Hee-Jung Song, Shin Kwang Kang, Nara Shin, Dong Woon Kim, Seon-Ah Jin, Jin-Ok Jeong, Kaikobad Irani, Byeong Hwa Jeon, Minho Shong, Gi Ryang Kweon, Cuk-Seong Kim
AIMS: Mitochondrial dysfunction has emerged as a major contributing factor to endothelial dysfunction and vascular disease, but the key mechanisms underlying mitochondrial dysfunction-induced endothelial dysfunction remain to be elucidated. In this study, we aim at determining whether mitochondrial dysfunction in endothelial cells plays a key role in vascular disease, by examining the phenotype of endothelial-specific CR6-interacting factor 1 (CRIF1) knockout mice. We also used siRNA-mediated downregulation of CRIF1 gene in the endothelial cells to study about the in vitro pathophysiological underlying mechanisms...
May 24, 2017: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/28398118/the-role-of-the-hydrogen-sulfide-pathway-in-male-and-female-urogenital-system-in-health-and-disease
#12
Roberta d'Emmanuele di Villa Bianca, Ferdinando Fusco, Vincenzo Mirone, Giuseppe Cirino, Raffaella Sorrentino
SIGNIFICANCE: The endogenous hydrogen sulfide (H2S) pathway produces an array of biological effects that vary depending on the bodily region. In addition, the H2S pathway's relevance often changes depending on a healthy or disease state. There is abundant evidence pointing to a key role for this pathway in male and female genito-urinary diseases, suggesting it as a possible target for new therapeutic approaches. Recent Advances: The tissue-specific localization of the H2S enzymes in the genito-urinary tract has allowed for a better understanding of its role in the body's pathophysiology...
May 19, 2017: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/28376661/succination-of-protein-disulfide-isomerase-links-mitochondrial-stress-and-endoplasmic-reticulum-stress-in-the-adipocyte-during-diabetes
#13
Allison M Manuel, Michael D Walla, Adam Faccenda, Stephanie L Martin, Ross M Tanis, Gerardo G Piroli, Julie Adam, Boris Kantor, Bulent Mutus, Danyelle M Townsend, Norma Frizzell
AIMS: Protein succination by fumarate increases in the adipose tissue of diabetic mice and in adipocytes matured in high glucose as a result of glucotoxicity-driven mitochondrial stress. The endoplasmic reticulum (ER) oxidoreductase protein disulfide isomerase (PDI) is succinated in adipocytes that are matured in high glucose, and in this study we investigated whether succination would alter PDI oxidoreductase activity, directly linking mitochondrial stress and ER stress. RESULTS: Protein succination and the ER stress marker C/EBP homologous protein (CHOP) were diminished after pharmaceutical targeting of mitochondrial stress with the chemical uncoupler niclosamide in adipocytes matured in high-glucose concentrations...
May 19, 2017: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/28257621/the-heme-oxygenase-system-in-hematological-malignancies
#14
Giovanni Li Volti, Daniele Tibullo, Luca Vanella, Cesarina Giallongo, Francesco Di Raimondo, Stefano Forte, Michelino Di Rosa, Salvatore Santo Signorelli, Ignazio Barbagallo
SIGNIFICANCE: Several lines of evidence suggest that hematological malignancies exhibit an altered redox balance homeostasis that can lead to the activation of various survival pathways that, in turn, lead to the progression of disease and chemoresistance. Among these pathways, the heme oxygenase-1 (HO-1) pathway is likely to play a major role. HO catalyzes the enzymatic degradation of heme with the simultaneous release of carbon monoxide (CO), ferrous iron (Fe(2+)), and biliverdin. This review focuses on the role of HO-1 in various hematological malignancies and the possibility of exploiting such targets to improve the outcome of well-established chemotherapeutic regimens...
May 19, 2017: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/28443683/redox-signaling-mediated-by-thioredoxin-and-glutathione-systems-in-the-central-nervous-system
#15
Xiaoyuan Ren, Lili Zou, Xu Zhang, Vasco Branco, Jun Wang, Cristina Carvalho, Arne Holmgren, Jun Lu
SIGNIFICANCE: The thioredoxin (Trx) and glutathione (GSH) systems play important roles in maintaining the redox balance in the brain, a tissue that is prone to oxidative stress due to its high-energy demand. These two disulfide reductase systems are active in various areas of the brain and are considered to be critical antioxidant systems in the central nervous system (CNS). Various neuronal disorders have been characterized to have imbalanced redox homeostasis. Recent Advances: In addition to their detrimental effects, recent studies have highlighted that reactive oxygen species/reactive nitrogen species (ROS/RNS) act as critical signaling molecules by modifying thiols in proteins...
May 18, 2017: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/28443679/emerging-roles-of-carbonyl-sulfide-in-chemical-biology-sulfide-transporter-or-gasotransmitter
#16
Andrea K Steiger, Yu Zhao, Michael D Pluth
SIGNIFICANCE: Carbonyl sulfide (COS) is the most prevalent sulfur-containing gas in the Earth's atmosphere, and it plays important roles in the global sulfur cycle. COS has been implicated in origin of life peptide ligation, is the primary energy source for certain bacteria, and has been detected in mammalian systems. Despite this long and intertwined history with terrestrial biology, limited attention has focused on potential roles of COS as a biological mediator. Recent Advances: Although bacterial COS production is well documented, definitive sources of mammalian COS production have not been confirmed...
May 18, 2017: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/28443673/fluorescent-probes-and-selective-inhibitors-for-biological-studies-of-hydrogen-sulfide-and-polysulfide-mediated-signaling
#17
Yoko Takano, Honami Echizen, Kenjiro Hanaoka
SIGNIFICANCE: Hydrogen sulfide (H2S) plays roles in many physiological processes, including relaxation of vascular smooth muscles, mediation of neurotransmission, inhibition of insulin signaling, and regulation of inflammation. Also, hydropersulfide (R-S-SH) and polysulfide (-S-Sn-S-) have recently been identified as reactive sulfur species (RSS) that regulate the bioactivities of multiple proteins via S-sulfhydration of cysteine residues (protein Cys-SSH) and show cytoprotection. Chemical tools such as fluorescent probes and selective inhibitors are needed to establish in detail the physiological roles of H2S and polysulfide...
May 18, 2017: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/28510506/signaling-at-the-crossroads-matrix-derived-proteoglycan-and-reactive-oxygen-species-signaling
#18
Madalina-Viviana Nastase, Andrea Janicova, Malgorzata Wygrecka, Liliana Schaefer
SIGNIFICANCE: Proteoglycans (PGs), besides their structural contribution, have emerged as dynamic components that mediate a multitude of cellular events. The various roles of PGs are attributed to their structure, spatial localization, and ability to act as ligands and receptors. Reactive oxygen species (ROS) are small mediators, which are generated in physiological and pathological conditions. Besides their reactivity and ability to induce oxidative stress, a growing body of data suggests that ROS signaling is more relevant than direct radical damage in development of human pathologies...
May 16, 2017: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/28510479/increased-expression-of-p22phox-mediates-airway-hyperresponsiveness-in-an-experimental-model-of-asthma
#19
Chandran Nagaraj, Hans Michael Haitchi, Akos Heinemann, Peter Howarth, Andrea Olschewski, Leigh M Marsh
AIM: Chronic airway diseases such as asthma are associated with increased production of reactive oxygen species (ROS) and oxidative stress. Endogenous NADPH oxidases are a major source of superoxide in lung, but their underlying role in asthma pathology is poorly understood. We sought to characterize the involvement of NADPH oxidase in allergic asthma by studying the role of CYBA (p22phox) in human asthma and murine house dust mite (HDM)-induced allergic airway inflammation. RESULTS: Increased expression and localisation of p22-PHOX was observed in biopsies of asthmatic patients...
May 16, 2017: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/28506121/mammalian-circadian-period-but-not-phase-and-amplitude-is-robust-against-redox-and-metabolic-perturbations
#20
Marrit Putker, Priya Crosby, Kevin A Feeney, Nathaniel P Hoyle, Ana S H da Costa, Edoardo Gaude, Christian Frezza, John Stuart O'Neill
AIMS: Circadian rhythms permeate all levels of biology to temporally regulate cell and whole-body physiology, although the cell-autonomous mechanism that confers ~24-hour periodicity is incompletely understood. Reports describing circadian oscillations of over-oxidised peroxiredoxin abundance have suggested redox signaling plays an important role in the timekeeping mechanism. Here, we tested the functional contribution that redox state and primary metabolism make to mammalian cellular timekeeping...
May 15, 2017: Antioxidants & Redox Signaling
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