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Free Radical Research

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https://www.readbyqxmd.com/read/28503972/molecular-mechanisms-of-anti-oxidant-and-anti-aging-effects-induced-by-convallatoxin-in-caenorhabditis-elegans
#1
Jia Xu, Youming Guo, Tianzhuo Sui, Qifei Wang, Yue Zhang, Ruining Zhang, Mingyang Wang, Shuwen Guan, Liping Wang
Convallatoxin is widely used as a cardiac glycoside in acute and chronic congestive heart-failure and paroxysmal tachycardia, with many effects and underlying protective mechanisms on inflammation and cellular proliferation. However, convallatoxin has not been investigated in its antioxidant effects and lifespan extension in Caenorhabditis elegans. In this study, we found that convallatoxin (20 μM) could significantly prolong the lifespan of wild-type C. elegans up to 16.3% through daf-16, but not sir-2.1 signaling and increased thermotolerance and resistance to paraquat-induced oxidative stress...
May 14, 2017: Free Radical Research
https://www.readbyqxmd.com/read/28503967/cytotoxic-and-cytoprotective-effects-of-tryptamine-4-5-dione-on-neuronal-cells-a-double-edged-sword
#2
Naoko Suga, Akira Murakami, Yoshimasa Nakamura, Akari Ishisaka, Noritoshi Kitamoto, Mikiko Ito, Yoji Kato
Serotonin (5-hydroxytryptamine) is a putative substrate for myeloperoxidase, which may convert it into the reactive quinone tryptamine-4,5-dione (TD). In this study, we found that the viability of human SH-SY5Y neuroblastoma cells treated with 25 µM TD was increased to approximately 117%. On the other hand, the cell viability was significantly decreased by exposure to TD (150-200 μM), with an increase in intracellular reactive oxygen species (ROS). Interestingly, pretreatment of SH-SY5Y cells with 100 μM TD prevented cell death and suppressed intracellular ROS generation evoked by the addition of hydrogen peroxide (H2O2)...
May 14, 2017: Free Radical Research
https://www.readbyqxmd.com/read/28488455/intracellular-methylglyoxal-induces-oxidative-damage-to-pancreatic-beta-cell-line-ins-1-cell-through-ire1%C3%AE-jnk-and-mitochondrial-apoptotic-pathway
#3
Chongxiao Liu, Yanhong Huang, Yifan Zhang, Xueru Chen, Xiang Kong, Yan Dong
An increased intracellular methylglyoxal (MGO) under hyperglycemia led to pancreatic beta cell death. However, its mechanism in which way with MGO induced beta cell death remains unknown. We investigated both high glucose and MGO treatment significantly inclined intracellular MGO concentration and inhibited cell viability in vitro. MGO treatment also triggered intracellular advanced glycation end products (AGEs) formation, declined mitochondrial membrane potential (MMP), increased oxidative stress and the expression of ER stress mediators Grp78/Bip and p-PERK; activated mitochondrial apoptotic pathway, which could mimic by Glo1 knockdown...
May 10, 2017: Free Radical Research
https://www.readbyqxmd.com/read/28427288/cigarette-smokers-develop-altered-erythrocyte-membrane-composition-an-investigation-unmasking-the-role-of-membrane-bound-integral-protein-glut-1
#4
Jyotirmoy Sikdar, Paromita Seal, Amartya Roy, Rajen Haldar
Erythrocytes in cigarette smokers are prone to oxidative damage. Here, we sought to elucidate the facts behind modifications and possible defense system developed in erythrocyte of cigarette smokers. We observed significant increase in stomatocytes and spherocytes, and osmotic fragility of erythrocyte, along with reduced level of protein thiol and increased fluorescence anisotropy in isolated membrane. Denaturing gel electrophoresis indicated alterations in band 3, band 4.2 and band 4.5. Among those, Glut 1 (i...
May 10, 2017: Free Radical Research
https://www.readbyqxmd.com/read/28427294/increased-phagocytic-nadph-oxidase-activity-associates-with-coronary-artery-calcification-in-asymptomatic-men
#5
Oscar Beloqui, María U Moreno, Gorka San José, Álvaro Pejenaute, Adriana Cortés, Manuel F Landecho, Javier Díez, Ana Fortuño, Guillermo Zalba
Vascular calcification is a common feature in atherosclerosis and associates with cardiovascular events. Oxidative stress may be involved in the pathogenesis of vascular calcification. Previous studies have shown that the phagocytic NADPH oxidase is associated with atherosclerosis. The objective of the present study was to investigate the association between phagocytic NADPH oxidase-mediated superoxide production and coronary artery calcium (CAC). NADPH oxidase-mediated superoxide production was determined by chemiluminescence and CAC by computed tomography in 159 asymptomatic men free of overt clinical atherosclerosis...
May 9, 2017: Free Radical Research
https://www.readbyqxmd.com/read/28427291/antioxidant-therapy-for-management-of-oxidative-stress-induced-hypertension
#6
Khalil Ali Ahmad, Dai Yuan Yuan, Waqas Nawaz, Hong Ze, Chen Xue Zhuo, Bashar Talal, Abdoh Taleb, Enos Mais, Ding Qilong
Hypertension is considered as the most common risk factor for cardiovascular diseases, also is regarded as a leading cause of the mortality and morbidity worldwide. The mechanisms underlying the pathological process of hypertension are not completely explained. However, there is growing evidence that increased oxidative stress plays an important role in the pathophysiology of hypertension. Several preclinical studies and clinical trials have indicated that antioxidant therapy is important for management of hypertension, using antioxidants compounds such as alpha tocopherol (Vit E) and ascorbic acid (Vit C), polyphenols with others and some antihypertensive drugs that are now in clinical use (e...
May 9, 2017: Free Radical Research
https://www.readbyqxmd.com/read/28412863/oxidized-lipoprotein-lipids-and-atherosclerosis
#7
Markku Ahotupa
Plasma lipoproteins contain variable amounts of lipid oxidation products (LOP), which are known to impair normal physiological functions and stimulate atherosclerotic processes. Recent evidence indicates that plasma lipoproteins are active carriers of LOP, low-density lipoprotein (LDL) directing transport toward peripheral tissues, and high-density lipoprotein (HDL) being active in the reverse transport. It has been proposed that the lipoprotein-specific transport of LOP could play a role in atherosclerosis-related effects of LDL and HDL...
May 9, 2017: Free Radical Research
https://www.readbyqxmd.com/read/28482716/dihydromyricetin-induces-apoptosis-and-cytoprotective-autophagy-through-ros-nf-%C3%AE%C2%BAb-signaling-in-human-melanoma-cells
#8
Ding-Zhou Zhou, Hai-Ying Sun, Jing-Qi Yue, Yong Peng, Yi-Ming Chen, Zhi-Jian Zhong
Dihydromyricetin (DHM), a Rattan tea extract, has recently been shown to have anti-cancer activity in mammalian cells. In the present study, we investigated the effect of DHM on human melanoma cells. Apart from induction of apoptosis, we demonstrated that DHM induced an autophagic response. Moreover, pharmacological inhibition or genetic blockade of autophagy enhanced DHM-induced cell death and apoptosis, indicating the cytoprotective role of autophagy in DHM-treated human melanoma cells. Further study suggested that the nuclear factor kappa B (NF-κB) signaling pathway was involved in DHM-induced autophagy...
May 8, 2017: Free Radical Research
https://www.readbyqxmd.com/read/28482710/sod2-gene-polymorphism-and-response-of-oxidative-stress-parameters-in-young-wrestlersto-a-three-month-training
#9
Ewa Jówko, Dariusz Gierczuk, Igor Cieśliński, Jadwiga Kotowska
The aim of the study was to analyse the effect of Val 16Ala polymorphism in SOD2 gene on oxidative stress parameters and lipid profile of the blood during a three-month wrestling training. The study included 53 Polish young wrestlers. Blood samples were collected at the beginning of the program and following three months of the training. The list of analysed parameters included erythrocyte and serum activities of superoxide dismutase (SOD), whole blood glutathione peroxidase (GPx) activity, total glutathione (tGSH) level, concentration of lipid hydroperoxides (LHs), total antioxidant capacity (TAC) and creatine kinase (CK) activity in the serum, as well as lipid profile parameters: triglycerides (TG), total cholesterol (TC), high-density (HDL-C) and low-density lipoprotein cholesterol (LDL-C)...
May 8, 2017: Free Radical Research
https://www.readbyqxmd.com/read/28480814/application-of-platelet-derived-growth-factor-bb-and-diabetic-wound-healing-the-relationship-with-oxidative-events
#10
Sibel Gökşen, Barbaros Balabanlı, Şule Coşkun Cevher
The reasons that cause delay in wound healing in diabetes are a decrease in the level of growth factors secretion, an increase in the destruction of growth factors and in oxidative stress. Platelet derived growth factor (PDGF) is one of the important growth factors that play a role in all phases of wound healing. This study investigates time-dependent effects of topically PDGF-BB administration on oxidative events on the healing of dorsolateral-excisional wounds in diabetic rats. Forty-two female Wistar-albino rats with streptozotocin (STZ)-induced diabetes were divided into four groups: control group, untreated group, chitosan-treated group, chitosan+PDGF-BB-treated group...
May 7, 2017: Free Radical Research
https://www.readbyqxmd.com/read/28480809/sodium-meta-arsenite-induced-reactive-oxygen-species-in-human-red-blood-cells-impaired-antioxidant-and-membrane-redox-systems-haemoglobin-oxidation-and-morphological-changes
#11
Nikhil Maheshwari, Fahim Halim Khan, Riaz Mahmood
Arsenic (As) is an air and water toxicant that causes cancer in multiple organs. Humans are exposed to arsenic through contaminated water. We have examined the cytotoxicity of sodium meta-arsenite (SA), an As(III) compound, in human red blood cells (RBC) under in vitro conditions. Hemolysates were prepared from human RBC treated with different concentrations of SA (0.1 to 5.0 mM) for 5 h at 37°C. SA treatment of RBC caused significant increase in methemoglobin formation, protein and lipid oxidation and nitric oxide levels...
May 7, 2017: Free Radical Research
https://www.readbyqxmd.com/read/28415887/amelioration-of-late-onset-hepatic-steatosis-in-idh2-deficient-mice
#12
Su Jeong Lee, Hanvit Cha, Hyunjin Kim, Jin Hyup Lee, Jeen-Woo Park
Nonalcoholic fatty liver disease (NAFLD) has a high prevalence in the general population and can evolve into nonalcoholic steatohepatosis (NASH), cirrhosis, and complications such as liver failure and hepatocellular carcinoma. Recently, we reported that mitochondrial NADP(+)-dependent isocitrate dehydrogenase, encoded by the IDH2, plays an important role in the regulation of redox balance and oxidative stress levels, which are tightly associated with intermediary metabolism and energy production. In the present study, we showed that in mice targeted disruption of IDH2 attenuates age-associated hepatic steatosis by the activation of p38/cJun NH2-terminal kinase (JNK) and p53, presumably induced by the elevation of mitochondrial reactive oxygen species (ROS), which in turn resulted in the suppression of hepatic lipogenesis and inflammation via the upregulation of fibroblast growth factor 21 (FGF21) and the inhibition of NFκB signaling pathways...
May 5, 2017: Free Radical Research
https://www.readbyqxmd.com/read/28463090/effects-of-transcranial-magnetic-stimulation-on-oxidative-stress-in-experimental-autoimmune-encephalomyelitis
#13
Francisco J Medina-Fernandez, Begoña M Escribano, Eduardo Agüera, Macarena Aguilar-Luque, Montserrat Feijoo, Evelio Luque, Fe I Garcia-Maceira, Alvaro Pascual-Leone, René Drucker-Colin, Isaac Tunez
Experimental autoimmune encephalomyelitis (EAE) reproduces a multiple sclerosis (MS)-like experimental model. The main objective was to evaluate the effect of extremely low-frequency electromagnetic fields (EL-EMF) application, like a paradigm of transcranial magnetic stimulation (TMS) in the development of EAE. Rats were injected with a single dose of 150 μg of myelin oligodendrocyte glycoprotein (MOG, fragment 35-55) to produce experimental MS. To assess the effect of TMS application in EAE, the rats were treated with TMS (60 Hz and 0...
May 2, 2017: Free Radical Research
https://www.readbyqxmd.com/read/28463089/purine-5-8-cyclo-2-deoxynucleoside-lesions-formation-by-radical-stress-and-repair-in-human-breast-epithelial-cancer-cells
#14
Marios G Krokidis, Michael A Terzidis, Eleni Efthimiadou, Sevasti-Kiriaki Zervou, George Kordas, Kyriakos Papadopoulos, Anastasia Hiskia, Dimitris Kletsas, Chryssostomos Chatgilialoglu
5',8-Cyclo-2'-deoxyadenosine (cdA) and 5',8-cyclo-2'-deoxyguanosine (cdG) in their two diastereomeric forms, 5'S and 5'R, are tandem lesions produced by the attack of hydroxyl radicals to the purine moieties of DNA. Their formation has been found to challenge the cells' repair machinery, initiating the nucleotide excision repair (NER) for restoring the genome integrity. The involvement of oxidatively induced DNA damage in carcinogenesis and the reduced capacity of some cancer cell lines to repair oxidized DNA base lesions, intrigued us to investigate the implication of these lesions in breast cancer, the most frequently occurring cancer in women...
May 2, 2017: Free Radical Research
https://www.readbyqxmd.com/read/28446034/free-radicals-impair-the-anti-oxidative-stress-activity-of-dj-1-through-the-formation-of-sds-resistant-dimer
#15
Tatsuki Yasuda, Takeshi Niki, Hiroyoshi Ariga, Sanae M M Iguchi-Ariga
DJ-1 is a causative gene for familial Parkinson's disease (PD). Loss-of-function of DJ-1 protein is suggested to contribute to the onset of PD, but the causes of DJ-1 dysfunction remain insufficiently elucidated. In this study, we found that the SDS-resistant irreversible dimer of DJ-1 protein was formed in human dopaminergic neuroblastoma SH-SY5Y cells, when the cells were exposed to massive superoxide inducers such as paraquat and diquat. The dimer was also formed in vitro by superoxide in PQ redox cycling system and hydroxyl radical produced in Fenton reaction...
April 26, 2017: Free Radical Research
https://www.readbyqxmd.com/read/28441900/placental-nfe2l2-is-discordantly-activated-in-monochorionic-twins-with-selective-intrauterine-growth-restriction-and-possibly-regulated-by-hypoxia
#16
Jing Wu, Zhiming He, Yu Gao, Guanglan Zhang, Xuan Huang, Qun Fang
INTRODUCTION: Nuclear factor, erythroid 2 like 2 (NFE2L2) is an important transcription factor that protects cells from oxidative stress (OS). NFE2L2 deficiency in placentas is associated with pregnancy complications. We have demonstrated that elevated OS existed in placental shares of the smaller fetus in selective intrauterine growth restriction (sIUGR); however, the role of NFE2L2 in the development of sIUGR remains unknown. In this study, we examined the levels of NFE2L2 and heme oxygenase 1 (HMOX1), a major antioxidant regulated by NFE2L2, in sIUGR placentas...
April 25, 2017: Free Radical Research
https://www.readbyqxmd.com/read/28372523/in-vivo-ros-production-and-use-of-oxidative-stress-derived-biomarkers-to-detect-the-onset-of-diseases-such-as-alzheimer-s-disease-parkinson-s-disease-and-diabetes
#17
Aya Umeno, Vasudevanpillai Biju, Yasukazu Yoshida
Breakthroughs in biochemistry have furthered our understanding of the onset and progression of various diseases, and have advanced the development of new therapeutics. Oxidative stress and reactive oxygen species (ROS) are ubiquitous in biological systems. ROS can be formed non-enzymatically by chemical, photochemical and electron transfer reactions, or as the byproducts of endogenous enzymatic reactions, phagocytosis, and inflammation. Imbalances in ROS homeostasis, caused by impairments in antioxidant enzymes or non-enzymatic antioxidant networks, increase oxidative stress, leading to the deleterious oxidation and chemical modification of biomacromolecules such as lipids, DNA, and proteins...
April 25, 2017: Free Radical Research
https://www.readbyqxmd.com/read/28376643/effect-of-tempol-on-peripheral-neuropathy-in-diet-induced-obese-and-high-fat-fed-low-dose-streptozotocin-treated-c57bl6-j-mice
#18
Alexander Obrosov, Hanna Shevalye, Lawrence J Coppey, Mark A Yorek
In this study, we sought to determine the efficacy of tempol on multiple neuropathic endpoints in a diet-induced obese mouse, a model of pre-diabetes, and a high-fat fed low-dose streptozotocin treated mouse, a model of type 2 diabetes. Tempol (4-hydroxy-2,2,6,6-tetramethylpiperdine -1-oxyl) is a low molecular weight, water soluble, membrane permeable, and metal-independent superoxide dismutase mimetic that has been widely used in cellular studies for the removal of intracellular and extracellular superoxide...
April 19, 2017: Free Radical Research
https://www.readbyqxmd.com/read/28330417/involvement-of-nox2-and-nox4-nadph-oxidases-in-early-brain-injury-after-subarachnoid-hemorrhage
#19
Li Zhang, Zhen Li, Dongxia Feng, Haitao Shen, Xiaodi Tian, Haiying Li, Zhong Wang, Gang Chen
Oxidative stress is responsible for a poor prognosis of subarachnoid hemorrhage (SAH) patients. Nox2 has been shown to participate in SAH-induced early brain injury (EBI). Nox4 is another major subtype of Nox family widely expressed in central nervous system (CNS). Here, we investigated the role of Nox4 and whether there was a synergistic effect of Nox2 and Nox4 in SAH-induced EBI. Clinical brain biopsies of four patients with traumatic brain injury (TBI) and perihematomal brain tissue from six subjects with SAH were examined...
April 9, 2017: Free Radical Research
https://www.readbyqxmd.com/read/28325093/differences-in-intracellular-mobile-zinc-levels-affect-susceptibility-to-plasma-activated-medium-induced-cytotoxicity
#20
Hirokazu Hara, Sayako Sueyoshi, Miko Taniguchi, Tetsuro Kamiya, Tetsuo Adachi
There is growing evidence that plasma-activated medium (PAM), which is prepared by non-thermal plasma (NTP) irradiation of cell-free medium, is a beneficial tool for cancer therapy. PAM has been reported to preferentially kill cancer cells; however, its mechanism is not fully understood. Since PAM contains reactive oxygen species (ROS) and reactive nitrogen species, the anti-cancer effects of PAM are thought to be attributed to oxidative stress induced by these reactive molecules. Oxidative stress has been shown to release zinc (Zn(2+)) from intracellular Zn(2+) stores and provoke Zn(2+)-dependent cell death...
April 9, 2017: Free Radical Research
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