Abstract:
:Ascorbic acid (vitamin C) induced hydrogen peroxide (H(2)O(2)) formation was measured in household drinking water and metal supplemented Milli-Q water by using the FOX assay. Here we show that ascorbic acid readily induces H(2)O(2) formation in Cu(II) supplemented Milli-Q water and poorly buffered household drinking water. In contrast to Cu(II), iron was not capable to support ascorbic acid induced H(2)O(2) formation during acidic conditions (pH: 3.5-5). In 12 out of the 48 drinking water samples incubated with 2 mM ascorbic acid, the H(2)O(2) concentration exceeded 400 microM. However, when trace amounts of Fe(III) (0.2 mg/l) was present during incubation, the ascorbic acid/Cu(II)-induced H(2)O(2) accumulation was totally blocked. Of the other common divalent or trivalent metal ions tested, that are normally present in drinking water (calcium, magnesium, zinc, cobalt, manganese or aluminum), only calcium and magnesium displayed a modest inhibitory activity on the ascorbic acid/Cu(II)-induced H(2)O(2) formation. Oxalic acid, one of the degradation products from ascorbic acid, was confirmed to actively participate in the iron induced degradation of H(2)O(2). Ascorbic acid/Cu(II)-induced H(2)O(2) formation during acidic conditions, as demonstrated here in poorly buffered drinking water, could be of importance in host defense against bacterial infections. In addition, our findings might explain the mechanism for the protective effect of iron against vitamin C induced cell toxicity.
journal_name
Free Radic Resjournal_title
Free radical researchauthors
Jansson PJ,Lindqvist C,Nordström Tdoi
10.1080/10715760500249861keywords:
subject
Has Abstractpub_date
2005-11-01 00:00:00pages
1233-9issue
11eissn
1071-5762issn
1029-2470pii
R337644312361151journal_volume
39pub_type
杂志文章abstract::To examine the involvement of p38 mitogen-activated protein kinase (p38 MAPK) and extracellular signal-regulated kinase (ERK) in the oxidative stress-induced increase of permeability in endothelial cells, the effects of a p38 MAPK inhibitor (SB203580) and ERK inhibitor (PD90859) on the H2O2-induced increase of permeab...
journal_title:Free radical research
pub_type: 杂志文章
doi:10.1080/10715760100301531
更新日期:2001-11-01 00:00:00
abstract::Because hepatic fibrosis usually involves more than one pathological process, combination therapy with modalities that target aberrant signaling cascade in activated hepatic stellate cells (HSCs) represents an alternative strategy. This study evaluates the hypothesis that astragaloside IV (AS-IV) and ferulic acid (FA)...
journal_title:Free radical research
pub_type: 杂志文章
doi:10.1080/10715762.2017.1290233
更新日期:2017-02-01 00:00:00
abstract::There is a correlation between oxidative stress generated by diethylnitrosamine (DEN) metabolism and liver cancer development. Quercetin is a flavonoid with anti-carcinogenic and antioxidant properties. This study demonstrates the mechanism of action for the chemopreventive effect of quercetin. A 10 mg/kg dose of quer...
journal_title:Free radical research
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更新日期:2009-02-01 00:00:00
abstract::Rheumatoid arthritis (RA) is characterized by synovial proliferation and migration which is induced by proinflammatory cytokines or oxidative stress, followed by joint destruction. Edaravone, clinically available free radical scavenger in Japan, is confirmed to be beneficial in the acute stage of cerebral infarction. ...
journal_title:Free radical research
pub_type: 杂志文章
doi:10.1080/10715760500401116
更新日期:2006-02-01 00:00:00
abstract::Oxidation of low density lipoprotein (LDL) has been implicated in the pathogenesis of atherosclerosis. The most common technique for measuring the oxidation of lipoproteins is the continuous measurement of the formation of conjugated diene at OD 234 nm. The concept of "lag time", derived from such measurements, has be...
journal_title:Free radical research
pub_type: 杂志文章,评审
doi:10.3109/10715769809065814
更新日期:1998-06-01 00:00:00
abstract::The turning point between apoptosis and necrosis induced by hydrogen peroxide (H2O2) have been investigated using human T-lymphoma Jurkat cells. Cells treated with 50 microM H2O2 exhibited caspase-9 and caspase-3 activation, finally leading to apoptotic cell death. Treatment with 500 microM H2O2 did not exhibit caspas...
journal_title:Free radical research
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doi:10.1080/10715760600632552
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abstract::Anxiety disorders are the most common mental illness in the USA affecting 18% of the population. The cause(s) of anxiety disorders is/are not completely clear, and research in the neurobiology of anxiety at the molecular level is still rather limited. Although mounting clinical and preclinical evidence now indicates t...
journal_title:Free radical research
pub_type: 杂志文章,评审
doi:10.1080/10715762.2018.1475733
更新日期:2018-07-01 00:00:00
abstract::Gamma-glutamylcysteine synthetase (GCS; also referred to as glutamate-cysteine ligase, GLCL) catalyzes the rate-limiting reaction in glutathione (GSH) biosynthesis. The GCS holoenzyme is composed of a catalytic and regulatory subunit, each encoded by a unique gene. In addition to some conditions which specifically upr...
journal_title:Free radical research
pub_type: 杂志文章,评审
doi:10.1080/10715760000300291
更新日期:2000-04-01 00:00:00
abstract::In the present study we tested the ability of different antioxidant agents, used alone or in combination, to reduce the reactive oxygen species (ROS) levels and to increase the glutathione peroxidase (GPx) activity. Moreover, we tested the ability of such antioxidant agents to reduce the serum levels of proinflammator...
journal_title:Free radical research
pub_type: 杂志文章
doi:10.1080/10715760303849
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abstract::Araucaria angustifolia (Bert.) O. Kuntze is a species critically endangered of extinction and its development and propagation is strongly affected by abiotic stress. We have previously shown the activation of uncoupling protein in A. angustifolia embryogenic stem cells subjected to cold stress. Now, we have furthered ...
journal_title:Free radical research
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doi:10.1080/10715762.2018.1548767
更新日期:2019-01-01 00:00:00
abstract::8-OH-deoxyguanosine can diminish the ability of the restriction endonucleases Hpa II and Msp I to cleave DNA. The exact position of the adduct within the recognition site appears to determine the extent of the effect. ...
journal_title:Free radical research
pub_type: 杂志文章
doi:10.3109/10715769509064038
更新日期:1995-09-01 00:00:00
abstract::Diet has been shown to modulate M(1)dG adduct, a biomarker of oxidative stress and lipid peroxidation. Thus, we analysed the association between diet and M(1)dG in 120 controls and 67 Map Ta Phut industrial estate workers in Rayong, Thailand, to evaluate the influence of fruit and vegetables, and fried and charcoal-gr...
journal_title:Free radical research
pub_type: 杂志文章
doi:10.3109/10715762.2011.640676
更新日期:2012-01-01 00:00:00
abstract::2,5,7,8-tetramethyl-2-(2'-carboxyethyl)-6-hydroxychroman (alpha-CEHC) has been identified as a major water-soluble metabolite of vitamin E, which circulates in the blood and is excreted with the urine. The aim of this study was to assess the antioxidant activity of alpha-CEHC using several methods with different proox...
journal_title:Free radical research
pub_type: 杂志文章
doi:10.1080/1071576021000005357
更新日期:2002-08-01 00:00:00
abstract::The mechanism of high-grade serous ovarian cancer (HGSC) development remains elusive. This review outlines recent advances in the understanding of sequential molecular changes associated with the development of HGSC, as well as describes oxidative stress-induced genomic instability and carcinogenesis. This article rev...
journal_title:Free radical research
pub_type: 杂志文章,评审
doi:10.1080/10715762.2017.1383605
更新日期:2017-10-01 00:00:00
abstract::Glycation of proteins or other biomolecules and their further long-term degradation result in the formation of advanced glycation end products, AGEs. AGEs and other ligands interact with their receptors, RAGEs, localized to a variety of tissues, but mainly in endothelium and vascular wall cells. This interaction trigg...
journal_title:Free radical research
pub_type: 杂志文章,评审
doi:10.3109/10715762.2013.815347
更新日期:2013-08-01 00:00:00
abstract::γ-Tocopherol (γ-T) scavenges reactive nitrogen species (RNS) to form 5-NO2-γ-T (NGT). However, α-T supplementation decreases circulating γ-T, which could limit its RNS scavenging activities. We hypothesized that α-T supplementation would mitigate NGT accumulation by impairing γ-T status. Healthy smokers (21 ± 1 y, n =...
journal_title:Free radical research
pub_type: 杂志文章
doi:10.3109/10715762.2015.1040788
更新日期:2015-01-01 00:00:00
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journal_title:Free radical research
pub_type: 杂志文章
doi:10.1080/10715760410001694008
更新日期:2004-06-01 00:00:00
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journal_title:Free radical research
pub_type: 杂志文章
doi:10.1080/10715762.2019.1668936
更新日期:2019-10-01 00:00:00
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journal_title:Free radical research
pub_type: 杂志文章
doi:10.3109/10715769609088034
更新日期:1996-05-01 00:00:00
abstract::The use of salicylate as a chemical trap for .OH represents a simple and convenient alternative to the use of spin trapping techniques to study oxidative injury in isolated perfused organs. In these systems, salicylate is included in the perfusion buffer at concentrations ranging from 0.1 to 2 mM depending on the dete...
journal_title:Free radical research
pub_type: 杂志文章,评审
doi:10.3109/10715769409056588
更新日期:1994-11-01 00:00:00
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journal_title:Free radical research
pub_type: 杂志文章
doi:10.3109/10715769609149049
更新日期:1996-09-01 00:00:00
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journal_title:Free radical research
pub_type: 杂志文章
doi:10.1080/10715760310001638010
更新日期:2004-05-01 00:00:00
abstract::Globular adiponectin (gAd) induces the generation of reactive oxygen species (ROS) and nitric oxide (NO) in the murine macrophage cell line RAW 264. This study investigated the role of the mammalian target of rapamycin (mTOR) in gAd-induced ROS and NO generation. gAd stimulation induced phosphorylation of mTOR, which ...
journal_title:Free radical research
pub_type: 杂志文章
doi:10.3109/10715760903348328
更新日期:2010-02-01 00:00:00
abstract::There is clear evidence implicating oxidative stress in the pathology of many neurodegenerative diseases. Reactive oxygen species (ROS) are the primary mediators of oxidative stress, and hydrogen peroxide, a key ROS, is generated during aggregation of the amyloid proteins associated with some of these diseases. Hydrog...
journal_title:Free radical research
pub_type: 杂志文章
doi:10.1080/10715760600632545
更新日期:2006-07-01 00:00:00
abstract::Reperfusion injury of the liver occurs in liver transplantation and in major hepatectomies. It triggers a severe oxidative stress that leads to increased lipid peroxidation. In our study we examined the effect of parenteral supranutritional administration of alpha-tocopherol, a vitamin that plays a key role in the end...
journal_title:Free radical research
pub_type: 杂志文章
doi:10.1080/10715760100300641
更新日期:2001-08-01 00:00:00
abstract::8-Oxoguanine (8-oxoG) is the most common DNA base modification in the mammalian genome, associated with oxidative stress. Here we analysed the alterations in the distribution of 8-oxoG across the entire murine genome, before and after an elevation of oxidative stress by the use of ferric nitrilotriacetate (Fe-NTA) as ...
journal_title:Free radical research
pub_type: 杂志文章
doi:10.1080/10715762.2020.1733548
更新日期:2020-04-16 00:00:00
abstract::Ceruloplasmin (CP) is a blue copper glycoprotein with multiple physiological functions including ferroxidase and oxidase activities. CP is also an important serum oxygen free radical (OFR) scavenger and antioxidant, exerting cardioprotective and antifibrillatory actions. Although it has been reported that CP activitie...
journal_title:Free radical research
pub_type: 杂志文章
doi:10.1080/10715760310001624079
更新日期:2004-01-01 00:00:00
abstract:PURPOSE:Aspiration pneumonia is infection of the respiratory tract resulting from accumulation of sputum in the larynx. N-acetyl-L-cysteine (NAC) might regulate mucin (MUC) expression and activate inherent anti-infective system in bronchiolar epithelial cells after cellular uptake, and therefore, serve as the preventat...
journal_title:Free radical research
pub_type: 杂志文章
doi:10.3109/10715762.2015.1087642
更新日期:2015-01-01 00:00:00
abstract::Melatonin is an endogenous indolamine, classically known as a light/dark regulator. Besides classical functions, melatonin has also showed to have a wide range of antitumoral effects in numerous cancer experimental models. However, no definite mechanism has been described to explain the whole range of antineoplasic ef...
journal_title:Free radical research
pub_type: 杂志文章
doi:10.3109/10715762.2011.623700
更新日期:2011-11-01 00:00:00
abstract::The host inflammatory response appears to be an important contributor to the pathogenesis of human viral respiratory illness. Virus-induced oxidative stress appears to mediate an early phase of elaboration of the proinflammatory cytokine interleukin-8 by respiratory epithelial cells. The purpose of these studies was t...
journal_title:Free radical research
pub_type: 杂志文章
doi:10.1080/1071576021000028316
更新日期:2002-10-01 00:00:00