keyword
MENU ▼
Read by QxMD icon Read
search

Selenium role as antioxidant

keyword
https://www.readbyqxmd.com/read/29168872/organoselenium-compounds-as-mimics-of-selenoproteins-and-thiol-modifier-agents
#1
REVIEW
Nilda V Barbosa, Cristina W Nogueira, Pablo A Nogara, Andreza F de Bem, Michael Aschner, João B T Rocha
Selenium is an essential trace element for animals and its role in the chemistry of life relies on a unique functional group: the selenol (-SeH) group. The selenol group participates in critical redox reactions. The antioxidant enzymes glutathione peroxidase (GPx) and thioredoxin reductase (TrxR) exemplify important selenoproteins. The selenol group shares several chemical properties with the thiol group (-SH), but it is much more reactive than the sulfur analogue. The substitution of S by Se has been exploited in organic synthesis for a long time, but in the last 4 decades the re-discovery of ebselen (2-phenyl-1,2-benzisoselenazol-3(2H)-one) and the demonstration that it has antioxidant and therapeutic properties has renovated interest in the field...
November 23, 2017: Metallomics: Integrated Biometal Science
https://www.readbyqxmd.com/read/29148959/effect-of-measuring-%C3%AE-glutamyl-transpeptidase-and-using-smoflipid-in-a-parenteral-nutrition-infusion-in-a-patient-with-severe-malabsorption-and-overlapping-primary-sclerosing-cholangitis-and-ulcerative-colitis
#2
Merin Kinikini
Studies discussing inflammation and oxidative stress state that these conditions are known contributors in the pathogenesis of cholestatic diseases and ulcerative colitis, and studies examining patients with liver disease have found decreased antioxidant status and significant elevation of lipid peroxides as compared with healthy subjects. One hypothesis in liver disease is that deficient antioxidant defense mechanisms may lead to excess oxygen free radical formation, which promotes deleterious processes in the liver...
November 1, 2017: JPEN. Journal of Parenteral and Enteral Nutrition
https://www.readbyqxmd.com/read/29123393/antioxidant-and-hepatoprotective-role-of-selenium-against-silver-nanoparticles
#3
Sabah Ansar, Saad M Alshehri, Manal Abudawood, Sherifa S Hamed, Tansir Ahamad
Silver nanoparticles (AgNPs) have attracted the most interest in terms of their potential biomedical and industrial applications. However, these nanoparticles have shown their toxic behavior toward environment, living tissues, and organisms. Selenium (Se), an essential trace element, is necessary for various metabolic processes, including protection against oxidative stress and immune function. The present study was undertaken to evaluate the effect of Se against AgNP-induced hepatic oxidative stress. AgNPs were synthesized and then prepared nanoparticles were characterized using various analytical techniques such as UV-visible spectroscopy, X-ray diffraction, and transmission electron microscopy...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/29119175/protective-effect-of-selenium-supplementation-following-oxidative-stress-mediated-by-glucose-on-retinal-pigment-epithelium
#4
Raquel González de Vega, Montserrat García, María Luisa Fernández-Sánchez, Héctor González-Iglesias, Alfredo Sanz-Medel
There are many conditions that affect the retina. However, diabetic retinopathy (RD) as a complication of Diabetes Mellitus continues to be the leading cause of blindness in working people globally. Diabetic retinopathy is an ocular complication of diabetes that is caused by the deterioration of the blood vessels that supply the retina, which has the consequence that the vision deteriorates irreversibly. The retina, and specifically the retinal pigment epithelium (RPE) is the only neural tissue that is exposed directly and frequently to light, which favors the oxidation of lipids that become extremely toxic to the cells of the retina...
November 9, 2017: Metallomics: Integrated Biometal Science
https://www.readbyqxmd.com/read/29101747/cloning-intracellular-localization-and-expression-of-the-mammalian-selenocysteine-containing-protein-selenoi-seli-in-tumor-cell-lines
#5
E G Varlamova, M V Goltyaev, V I Novoselov, E E Fesenko
The intracellular localization of human selenoprotein SelI and the degree of expression of its gene in different human tumor cell lines were determined. It was found that the SelI protein is present in the nucleus, cytoplasm, and endoplasmic reticulum and is absent in the nucleolus. Since the oxidative stress caused by a sharp increase in the content of free radicals in the body is one of the causes of malignant transformation, the study of the role of the trace element selenium and selenocysteine-containing proteins as antioxidants in carcinogenesis is of great scientific interest...
September 2017: Doklady. Biochemistry and Biophysics
https://www.readbyqxmd.com/read/29082812/impact-of-selenium-status-on-aroclor-1254-induced-dna-damage-in-sperm-and-different-tissues-of-rats
#6
Sevtap Aydin, Pinar Erkekoglu, Nurşen Başaran, Belma Kocer-Gumusel
Aroclor 1254 is a commercial mixture of polychlorinated biphenyls (PCBs), which are widespread environmental pollutants. It is used as non-flammable heat transfer agent and plasticizer. Animal studies have reported that Aroclor 1254 exerted toxic effects in different organs and systems. Although the evidences are limited, it seems reasonable that Aroclor 1254 may have a potential for similar adverse effects in humans. Selenium (Se) is a trace element and an important component of cellular antioxidant defense...
October 30, 2017: Toxicology Mechanisms and Methods
https://www.readbyqxmd.com/read/29061379/comparative-effects-of-transforming-growth-factor-beta-isoforms-on-redox-metabolism-in-thyroid-cells
#7
Romina Oglio, Lisa Thomasz, Leonardo Salvarredi, Guillermo Juvenal, Mario Pisarev
INTRODUCTION: Transforming growth factor beta (TGF-β) regulates thyroid function and growth. However, tumoral thyroid cells became resistant to this factor as they undifferentiated. Little is known about the effects of TGF-β isoforms. We compared the role of redox metabolism in the response to TGF-β isoforms between non tumoral and tumoral thyroid cells. METHODOLOGY AND RESULTS: Differentiated rat thyroid cells (FRTL-5) and human thyroid follicular carcinoma cells (WRO) were treated with the three isoforms of TGF-β...
October 20, 2017: Molecular and Cellular Endocrinology
https://www.readbyqxmd.com/read/29057438/selected-trace-elements-concentrations-in-pregnancy-and-their-possible-role-literature-review
#8
Iwona Lewicka, Rafał Kocyłowski, Mariusz Grzesiak, Zuzanna Gaj, Przemysław Oszukowski, Joanna Suliburska
The aim of this study was to review the role of selected trace elements in pregnancy and fetal development. Citations related to the role of iron (Fe), zinc (Zn), manganese (Mn), copper (Cu) and selenium (Se) during pregnancy were searched in PubMed, Medline, Web of Science, using keywords and MeSH terms. Inadequate supply of trace elements can cause abnormalities of fetal development and predispose a child to disorders later on in life. Trace elements are the key elements of complex enzymes responsible for the modulation of the antioxidant defense system of the organism...
2017: Ginekologia Polska
https://www.readbyqxmd.com/read/29054422/selenoproteins-in-tumorigenesis-and-cancer-progression
#9
Sarah P Short, Christopher S Williams
Selenium is a micronutrient essential to human health and has long been associated with cancer prevention. Functionally, these effects are thought to be mediated by a class of selenium-containing proteins known as selenoproteins. Indeed, many selenoproteins have antioxidant activity which can attenuate cancer development by minimizing oxidative insult and resultant DNA damage. However, oxidative stress is increasingly being recognized for its "double-edged sword" effect in tumorigenesis, whereby it can mediate both negative and positive effects on tumor growth depending on the cellular context...
2017: Advances in Cancer Research
https://www.readbyqxmd.com/read/29040815/the-role-of-folic-acid-and-selenium-against-oxidative-ethanol-damage-in-early-life-programming-a-review
#10
Mª Luisa Ojeda Murillo, Fatima Nogales Bueno, Mª Luisa Murillo Taravillo, Olimpia Carreras Sánchez
Several disorders in children, called Fetal Alcohol Spectrum Disorders (FASD), occur as result of alcohol consumption during pregnancy and lactation. They appear, at least in part, to be related to the oxidative stress that this drug generates. Ethanol metabolism generates reactive oxygen species and causes a depletion of the antioxidant molecule glutathione (GSH) leading to oxidative stress and lipid and protein damage which are related to growth retardation and neurotoxicity, increasing the incidence of FASD...
October 17, 2017: Biochemistry and Cell Biology, Biochimie et Biologie Cellulaire
https://www.readbyqxmd.com/read/28965599/selenium-protein-identification-and-profiling-by-mass-spectrometry-a-tool-to-assess-progression-of-cardiomyopathy-in-a-whale-model
#11
Colleen E Bryan, Gregory D Bossart, Steven J Christopher, W Clay Davis, Lisa E Kilpatrick, Wayne E McFee, Terrence X O'Brien
Non-ischemic cardiomyopathy is a leading cause of congestive heart failure and sudden cardiac death in humans and in some cases the etiology of cardiomyopathy can include the downstream effects of an essential element deficiency. Of all mammal species, pygmy sperm whales (Kogia breviceps) present the greatest known prevalence of cardiomyopathy with more than half of examined individuals indicating the presence of cardiomyopathy from gross and histo-pathology. Several factors such as genetics, infectious agents, contaminants, biotoxins, and inappropriate dietary intake (vitamins, selenium, mercury, and pro-oxidants), may contribute to the development of idiopathic cardiomyopathy in K...
December 2017: Journal of Trace Elements in Medicine and Biology
https://www.readbyqxmd.com/read/28965564/concentration-of-selenium-zinc-copper-cu-zn-ratio-total-antioxidant-status-and-c-reactive-protein-in-the-serum-of-patients-with-psoriasis-treated-by-narrow-band-ultraviolet-b-phototherapy-a-case-control-study
#12
Marta Wacewicz, Katarzyna Socha, Jolanta Soroczyńska, Marek Niczyporuk, Piotr Aleksiejczuk, Jolanta Ostrowska, Maria H Borawska
BACKGROUND: Psoriasis is a common, an inflammatory skin disease. Trace elements may play an active role in the pathogenesis of psoriasis. OBJECTIVE: The aim of this study was to estimate the concentration of selenium (Se), zinc (Zn), copper (Cu) and Cu/Zn ratio as well as total antioxidant status (TAS) and c-reactive protein (CRP) in the serum of patients with psoriasis. METHODS: In this case-control study sixty patients with psoriasis and fifty-eight healthy people were examined...
December 2017: Journal of Trace Elements in Medicine and Biology
https://www.readbyqxmd.com/read/28964863/identification-and-characterization-of-two-selenium-dependent-glutathione-peroxidase-1-isoforms-from-larimichthys-crocea
#13
Xiaoze Xie, Mengnan Chen, Aiyi Zhu
Glutathione peroxidases, a vital family of antioxidant enzymes in oxybiotic organisms, are involved in anti-pathogen immune response. In this study, two complete selenium-dependent glutathione peroxidase 1 cDNAs (designated as LcGPx1a and LcGPx1b) were obtained from the large yellow croaker Larimichthys crocea by rapid amplification of cDNA ends. The full-length sequence of LcGPx1a was 917 bp with a 5'-untranslated region (UTR) of 52 bp, a 3'-UTR of 289 bp, and an open reading frame of 576 bp encoding 191 amino acid (aa) polypeptides...
September 28, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28954483/lithium-as-a-prooxidant-a-possible-protective-role-of-selenium-in-vitro-study
#14
Irena Musik, Małgorzata Kiełczykowska, Barbara Rajtar, Łukasz Świątek, Małgorzata Polz-Dacewicz, Joanna Kocot
INTRODUCTION AND OBJECTIVE: Lithium is used in medicine but its application may cause diverse side effects. Selenium has been found to show protective properties against negative influence of different harmful factors. This study was aimed at evaluating the influence of non-toxic dose of lithium on antioxidant parameters in FaDu (ATCC HTB-43) and Vero (ECACC No. 84113001) cell lines as well as the possible protective effect of non-toxic concentration of sodium selenite. MATERIAL AND METHODS: The cells were subjected to 0...
September 21, 2017: Annals of Agricultural and Environmental Medicine: AAEM
https://www.readbyqxmd.com/read/28892882/circulating-protein-carbonyls-antioxidant-enzymes-and-related-trace-minerals-among-preterms-with-respiratory-distress-syndrome
#15
Ahmed El-Abd Ahmed, Eman Ahmed Abd-Elmawgood, Mohammed H Hassan
INTRODUCTION: Information about oxidative stress in preterms with Respiratory Distress Syndrome (RDS) is defective, so various researches in this area are required, which may open new roads in understanding the pathogenesis of the disease, hence provide additional helpful therapeutic approaches. AIM: To assess and compare the plasma level of protein carbonyls as a marker for oxidant status and the antioxidant enzymes; Superoxide Dismutase (SOD) and Glutathione Peroxidase (GPx) and the related trace minerals in the form of Copper (Cu), Zinc (Zn) and Selenium (Se) as markers for antioxidant status, in preterms with and without RDS...
July 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/28880681/synthesis-and-antioxidant-properties-of-lycium-barbarum-polysaccharides-capped-selenium-nanoparticles-using-tea-extract
#16
Wenjing Zhang, Juan Zhang, Dejun Ding, Liping Zhang, Luis Alexandre Muehlmann, Shu-E Deng, Xuedong Wang, Wentong Li, Weifen Zhang
Selenium nanoparticles (SeNPs) have attracted increasing interest over the last decades because of their activities on redox balance in human body. However, the SeNPs tend to aggregate into large clusters, resulting in lower bioactivity, bioavailability and biocompatibility. Surface-capping agents on SeNPs play crucial roles in its stabilization and biological activity. Here, a green synthesis method for the preparation of Lycium barbarum polysaccharides capped SeNPs using green tea extracts as reductants under mild conditions, at room temperature, is reported...
September 7, 2017: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/28821244/the-effect-of-dietary-bacterial-organic-selenium-on-growth-performance-antioxidant-capacity-and-selenoproteins-gene-expression-in-broiler-chickens
#17
A M Dalia, T C Loh, A Q Sazili, M F Jahromi, A A Samsudin
BACKGROUND: Selenium (Se) is an essential trace mineral in broilers, which has several important roles in biological processes. Organic forms of Se are more efficient than inorganic forms and can be produced biologically via Se microbial reduction. Hence, the possibility of using Se-enriched bacteria as feed supplement may provide an interesting source of organic Se, and benefit broiler antioxidant system and other biological processes. The objective of this study was to examine the impacts of inorganic Se and different bacterial organic Se sources on the performance, serum and tissues Se status, antioxidant capacity, and liver mRNA expression of selenoproteins in broilers...
August 18, 2017: BMC Veterinary Research
https://www.readbyqxmd.com/read/28783600/selenium-antagonizes-cadmium-induced-apoptosis-in-chicken-spleen-but-not-involving-nrf2-regulated-antioxidant-response
#18
Menghao Chen, Xiaojing Li, Ruifeng Fan, Changyu Cao, Haidong Yao, Shiwen Xu
The nuclear transcription factor NF-E2-related factor 2 (Nrf2) binds to antioxidant response elements (AREs) and is involved in the regulation of genes participated in defending cells against oxidative damage, which have been confirmed in animal models. Selenium (Se), known as an important element in the regulation of antioxidant activity, can antagonize Cadmium (Cd) toxicity in birds. However, the role of Nrf2 in selenium-cadmium interaction has not been reported in birds. To further explore the mechanism of selenium attenuating spleen toxicity induced by cadmium in chickens, cadmium chloride (CdCl2, 150mg/kg) and sodium selenite (Na2SeO3, 2mg/kg) were co-administrated or individually administered in the diet of chickens for 90 days...
August 4, 2017: Ecotoxicology and Environmental Safety
https://www.readbyqxmd.com/read/28782302/effect-of-in-vitro-selenium-supplementation-on-sperm-quality-in-asthenoteratozoospermic-men
#19
A A Ghafarizadeh, G Vaezi, M A Shariatzadeh, A A Malekirad
Sperm DNA damage, excessive oxidative stress and decrease in motility ‎may lead to low fertilisation or poor‎ assisted reproductive techniques outcomes in asthenoteratozoospermic ‎men. Selenium was considered as essential element for male reproductive functions. Selenium has important role in enzymatic process for elimination of excessive reactive oxygen species and helps to maintain membrane integrity. The aim of this study was to determine the effect of selenium supplementation on sperm quality, DNA fragmentation, mitochondrial membrane potential and membrane lipid peroxidation during sperm sampling in vitro at different times...
August 6, 2017: Andrologia
https://www.readbyqxmd.com/read/28718676/selenium-zinc-copper-cu-zn-ratio-and-total-antioxidant-status-in-the-serum-of-vitiligo-patients-treated-by-narrow-band-ultraviolet-b-phototherapy
#20
Marta Wacewicz, Katarzyna Socha, Jolanta Soroczyńska, Marek Niczyporuk, Piotr Aleksiejczuk, Jolanta Ostrowska, Maria H Borawska
BACKGROUND: Vitiligo is a chronic, depigmenting skin disorder, whose pathogenesis is still unknown. Narrow band ultraviolet-B (NB-UVB) is now one of the most widely used treatment of vitiligo. It was suggested that trace elements may play a role in pathogenesis of vitiligo. AIM: The aim of this study was to estimate the concentration of selenium (Se), zinc (Zn), copper (Cu) and Cu/Zn ratio as well as total antioxidant status (TAS) in the serum of patients with vitiligo...
August 1, 2017: Journal of Dermatological Treatment
keyword
keyword
119206
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"