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Selenoprotein

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https://www.readbyqxmd.com/read/28523359/arginine-cga-codons-as-a-source-of-nonsense-mutations-a-possible-role-in-multivariant-gene-expression-control-of-mrna-quality-and-aging
#1
Georgy A Romanov, Victor S Sukhoverov
Methylation of cytosine residues in DNA of higher eukaryotes, including humans, creates "hot spots" of C→T transitions in the genome. The predominantly methylated sequence in mammalian DNAs is CG (CpG). Among CG-containing codons, CGA codons for arginine are unique due to their ability to create stop codons TGA (UGA in mRNA) upon epigenetic-mediated mutation. As such nonsense mutations can have a strong adverse effect on the cell and organism, we have performed a study, on the example of human genes, aimed to characterise the anticipated effects of epigenetic-mediated nonsense mutations CGA→TGA in somatic cells...
May 18, 2017: Molecular Genetics and Genomics: MGG
https://www.readbyqxmd.com/read/28510033/the-antagonistic-effect-of-selenium-on-cadmium-induced-damage-and-mrna-levels-of-selenoprotein-genes-and-inflammatory-factors-in-chicken-kidney-tissue
#2
Xinyue Wang, Rongkun Bao, Jing Fu
Selenium (Se) is a necessary trace mineral in the diet of humans and animals. Cadmium (Cd) is a toxic heavy metal that can damage animal organs, especially the kidneys. Antagonistic interactions between Se and Cd have been reported in previous studies. However, little is known about the effects of Se against Cd toxicity and on the mRNA levels of 25 selenoprotein genes and inflammatory factors in chicken kidneys. In the current study, we fed chickens with a Se-treated, Cd-treated, or Se/Cd treated diet for 90 days...
May 16, 2017: Biological Trace Element Research
https://www.readbyqxmd.com/read/28506443/endoplasmic-reticulum-resident-selenoproteins-as-regulators-of-calcium-signaling-and-homeostasis
#3
REVIEW
Matthew W Pitts, Peter R Hoffmann
The human selenoprotein family contains 25 members that share the common feature of containing the amino acid, selenocysteine (Sec). Seven selenoproteins are localized to the endoplasmic reticulum (ER) and exhibit different structural features contributing to a range of cellular functions. Some of these functions are either directly or indirectly related to calcium (Ca(2+)) flux or homeostasis. The presence of the unique Sec residue within these proteins allows some to exert oxidoreductase activity, while the function of the Sec in other ER selenoproteins remains unclear...
May 4, 2017: Cell Calcium
https://www.readbyqxmd.com/read/28501922/sepp1-polymorphisms-modulate-serum-glucose-and-lipid-response-to-brazil-nut-supplementation
#4
Janaina L S Donadio, Marcelo M Rogero, Elvira M Guerra-Shinohara, Charles Desmarchelier, Patrick Borel, Silvia M F Cozzolino
PURPOSE: The consumption of Brazil nuts has been associated with benefits to lipid metabolism and reductions in total cholesterol and LDL concentrations. They are the richest natural source of selenium which has essential functions in human physiology. Genetic polymorphisms in Selenoprotein P could impair lipid and glucose metabolisms. The aim of this work was to verify the influence of polymorphisms in genes for selenoproteins on blood lipid levels after dietary supplementation with Brazil nuts in healthy adults...
May 13, 2017: European Journal of Nutrition
https://www.readbyqxmd.com/read/28499373/a-case-control-study-of-selenoprotein-genes-polymorphisms-and-autoimmune-thyroid-diseases-in-a-chinese-population
#5
Ling Xiao, Jianghong Yuan, Qiuming Yao, Ni Yan, Ronghua Song, Wenjuan Jiang, Danfeng Li, Liangfeng Shi, Jin-An Zhang
BACKGROUND: Selenium is an essential trace and there is a high selenium concentration in the thyroid gland. Selenium deficiency may impair the thyroid function. The aim of this study was to investigate the association between three selenoprotein genes polymorphisms and autoimmune thyroid diseases. METHODS: We genotyped six single-nucleotide polymorphisms (SNPs), rs6865453 in selenoprotein P gene (SELENOP), rs713041 rs2074451 rs3746165 in glutathione peroxidase 4 gene (GPX4) and rs28665122 and rs7178239 in selenoprotein S gene (SELENOS) by MassARRAY system using the chip-based matrix-assisted laser desorption ionization time-of-flight mass spectrometry technology in 1060 patients with autoimmune thyroid diseases and 938 healthy controls...
May 12, 2017: BMC Medical Genetics
https://www.readbyqxmd.com/read/28488249/uptake-and-utilization-of-selenium-from-selenoprotein-p
#6
Sumangala Shetty, John R Marsicano, Paul R Copeland
Selenoprotein P (SELENOP) is a serum glycoprotein that is required for proper selenium distribution in mammals, particularly in supplying selenium to the brain and testes. As the sole mechanism for providing essential selenium to developing spermatozoa, SELENOP metabolism is central to male fertility in all mammals. In addition, this process is important for proper brain function, especially under conditions of limited dietary selenium. Several specific and nonspecific mechanisms for SELENOP uptake in target tissues have been described, but the utilization of SELENOP as a source of selenium for intracellular selenoprotein production has not been systematically characterized...
May 9, 2017: Biological Trace Element Research
https://www.readbyqxmd.com/read/28474510/circulating-selenoprotein-p-levels-in-relation-to-mri-derived-body-fat-volumes-liver-fat-content-and-metabolic-disorders
#7
Romina di Giuseppe, Manja Koch, Sabrina Schlesinger, Jan Borggrefe, Marcus Both, Hans-Peter Müller, Jan Kassubek, Gunnar Jacobs, Ute Nöthlings, Wolfgang Lieb
OBJECTIVE: Association studies of selenoprotein P (SELENOP) with cardiometabolic traits in humans are relatively scarce and, in part, conflicting. A general population sample from Northern Germany was evaluated for cross-sectional associations of circulating SELENOP concentrations with metabolic syndrome (MetS), total volumes of MRI-determined visceral (VAT) and subcutaneous (SAT) abdominal adipose tissue, liver signal intensity, and fatty liver disease (FLD). METHODS: Nine hundred and five participants received comprehensive clinical and molecular phenotyping along with measurement of serum SELENOP; 584 individuals received MRI...
May 5, 2017: Obesity
https://www.readbyqxmd.com/read/28465347/eicosapentaenoic-acid-downregulates-expression-of-the-selenoprotein-p-gene-by-inhibiting-srebp-1c-independently-of-the-ampk-pathway-in-h4iiec3-hepatocytes
#8
Natsumi Tajima-Shirasaki, Kiyo-Aki Ishii, Hiroaki Takayama, Takayoshi Shirasaki, Hisakazu Iwama, Keita Chikamoto, Yoshiro Saito, Yasumasa Iwasaki, Atsushi Teraguchi, Fei Lan, Akihiro Kikuchi, Yumie Takeshita, Koji Murao, Seiichi Matsugo, Shuichi Kaneko, Hirofumi Misu, Toshinari Takamura
Selenoprotein P (encoded by SELENOP in humans, Selenop in rat), a liver-derived secretory protein, induces resistance to insulin and vascular endothelial growth factor (VEGF) in type 2 diabetes. Suppression of selenoprotein P may provide a novel therapeutic approach to treating type 2 diabetes; however, few drugs inhibiting SELENOP expression in hepatocytes have been identified. The present findings demonstrate that eicosapentaenoic acid (EPA) suppresses SELENOP expression by inactivating sterol regulatory element-binding protein-1c (SREBP-1c, encoded by Srebf1 in rat) in H4IIEC3 hepatocytes...
May 2, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28459371/role-of-microrna-7-and-selenoprotein-p-in-hepatocellular-carcinoma
#9
Marwa Tarek, Manal Louis Louka, Eman Khairy, Randa Ali-Labib, Doaa Zakaria Zaky, Iman F Montasser
There is an obvious need to diagnose hepatocellular carcinoma using novel non-invasive and sensitive biomarkers. In this regard, the aim of this study was to evaluate and correlate both relative quantification of microRNA-7 using quantitative real time polymerase chain reaction and quantitative analysis of selenoprotein P using enzyme-linked immunosorbent assay in sera of hepatocellular carcinoma patients, chronic liver disease patients, as well as normal healthy subjects in order to establish a new diagnostic biomarker with a valid non-invasive technique...
May 2017: Tumour Biology: the Journal of the International Society for Oncodevelopmental Biology and Medicine
https://www.readbyqxmd.com/read/28454412/comparison-of-the-seleno-transcriptome-expression-between-human-non-cancerous-mammary-epithelial-cells-and-two-human-breast-cancer-cell-lines
#10
Fabiola Rusolo, Francesca Capone, Raffaella Pasquale, Antonella Angiolillo, Giovanni Colonna, Giuseppe Castello, Maria Costantini, Susan Costantini
Breast cancer is the second most common cause of mortality in women; therefore, the identification of novel putative markers is required to improve its diagnosis and prognosis. Selenium is known to protect mammary epithelial cells from oxidative DNA damage, and to inhibit the initiation phase of carcinogenesis by stimulating DNA repair and apoptosis regulation. Consequently, the present study has focused attention on the selenoprotein family and their involvement in breast cancer. The present study performed a global analysis of the seleno-transcriptome expression in human breast cancer MCF-7 and MDA-MB231 cell lines compared with healthy breast MCF-10A cells using reverse transcription-quantitative polymerase chain reaction...
April 2017: Oncology Letters
https://www.readbyqxmd.com/read/28453930/the-apoe-%C3%AE%C2%B54-allele-is-associated-with-lower-selenium-levels-in-the-brain-implications-for-alzheimer-s-disease
#11
Bárbara R Cardoso, Dominic J Hare, Monica Lind, Catriona A McLean, Irene Volitakis, Simon M Laws, Colin L Masters, Ashley I Bush, Blaine R Roberts
The antioxidant activity of selenium, which is mainly conferred by its incorporation into dedicated selenoproteins, has been suggested as a possible neuroprotective approach for mitigating neuronal loss in Alzheimer's disease. However, there is inconsistent information with respect to selenium levels in the Alzheimer's disease brain. We examined the concentration and cellular compartmentalization of selenium in the temporal cortex of Alzheimer's disease and control brain tissue. We found that Alzheimer's disease was associated with decreased selenium concentration in both soluble (i...
May 3, 2017: ACS Chemical Neuroscience
https://www.readbyqxmd.com/read/28451306/accessing-human-selenoproteins-through-chemical-protein-synthesis
#12
L Dery, P Sai Reddy, S Dery, R Mousa, O Ktorza, A Talhami, N Metanis
The human body contains 25 selenoproteins, which contain in their sequence the twenty-first encoded amino acid, selenocysteine. About a dozen of these proteins remain functionally uncharacterized or poorly studied. Challenges in accessing these selenoproteins using traditional recombinant expressions have prevented biological characterization thus far. Chemical protein synthesis has the potential to overcome these hurdles. Here we report the first total chemical syntheses of two human selenoproteins, selenoprotein M (SELM) and selenoprotein W (SELW)...
March 1, 2017: Chemical Science
https://www.readbyqxmd.com/read/28437656/a-gene-environment-interaction-analysis-of-plasma-selenium-with-prevalent-and-incident-diabetes-the-hortega-study
#13
Inmaculada Galan-Chilet, Maria Grau-Perez, Griselda De Marco, Eliseo Guallar, Juan Carlos Martin-Escudero, Alejandro Dominguez-Lucas, Isabel Gonzalez-Manzano, Raul Lopez-Izquierdo, Laisa Socorro Briongos-Figuero, Josep Redon, Felipe Javier Chaves, Maria Tellez-Plaza
BACKGROUND: Selenium and single-nucleotide-polymorphisms in selenoprotein genes have been associated to diabetes. However, the interaction of selenium with genetic variation in diabetes and oxidative stress-related genes has not been evaluated as a potential determinant of diabetes risk. METHODS: We evaluated the cross-sectional and prospective associations of plasma selenium concentrations with type 2 diabetes, and the interaction of selenium concentrations with genetic variation in candidate polymorphisms, in a representative sample of 1452 men and women aged 18-85 years from Spain...
April 14, 2017: Redox Biology
https://www.readbyqxmd.com/read/28429287/protective-effect-of-selenoprotein-x-against-oxidative-stress-induced-cell-apoptosis-in-human-hepatocyte-lo2-cells-via-the-p38-pathway
#14
Jia-Yong Tang, Ai-Hua He, Gang Jia, Guang-Mang Liu, Xiao-Ling Chen, Jing-Yi Cai, Hai-Ying Shang, Jin-Qiu Liao, Hua Zhao
Oxidative stress, as mediated by ROS (reactive oxygen species), is a significant factor in initiating the cells damaged by affecting cellular macromolecules and impairing their biological functions; SelX, a selenoprotein also known as MsrB1 belonging to the methionine sulfoxide reductase (Msr) family, is the redox repairing enzyme and involved in redox-related functions. In order to more precisely analyze the relationship between oxidative stress, cell oxidative damage, and SelX, we stably overexpressed porcine Selx full-length cDNA in human normal hepatocyte (LO2) cells...
April 20, 2017: Biological Trace Element Research
https://www.readbyqxmd.com/read/28429286/effects-of-selenium-supplementation-on-the-diabetic-condition-depend-on-the-baseline-selenium-status-in-kkay-mice
#15
Novian Febiyanto, Chiho Yamazaki, Satomi Kameo, Dian K Sari, Irma M Puspitasari, Deni K Sunjaya, Dewi M D Herawati, Gaga I Nugraha, Toshio Fukuda, Hiroshi Koyama
Oxidative stress in obesity leads to insulin resistance in type 2 diabetes. Some selenoproteins possess antioxidant properties, suggesting that selenium (Se) may protect against type 2 diabetes; however, evidence from epidemiological studies is contradictory. We hypothesized that Se status before supplementation (baseline) contributes to the supplementation outcome. This study aimed to clarify the influence of baseline Se status on the effect of Se supplementation on the diabetic condition. Six-week-old KKAy mice were fed a diet without supplemental Se or with 0...
April 20, 2017: Biological Trace Element Research
https://www.readbyqxmd.com/read/28424960/selenium-for-the-mitigation-of-toxicity-induced-by-lead-in-chicken-testes-through-regulating-mrna-expressions-of-hsps-and-selenoproteins
#16
He Huang, Yan Wang, Yang An, Yaguang Tian, Shu Li, Xiaohua Teng
Lead (Pb) is a toxic element and environmental pollutant. Pb toxicity and antagonistic effect of selenium (Se) on Pb have been deeply studied in mammals. The testis is one of the target organs of Pb in birds. The aim of this study was to investigate the mitigating effect of Se on Pb toxicity in chicken testes by determining messenger RNA (mRNA) expressions of 5 heat shock proteins (HSPs) and 25 selenoproteins. Sixty male chickens (7-day-old) were randomly divided into the control group, the Se group, the Pb group, and the Pb + Se group, and were fed for 90 days...
April 20, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/28415800/selenophosphate-synthetase-1-sps1-is-required-for-the-development-and-selenium-homeostasis-of-central-nervous-system-in-chicken-gallus-gallus
#17
Jin-Long Li, Wei Li, Xue-Tong Sun, Jun Xia, Xue-Nan Li, Jia Lin, Cong Zhang, Xiao-Chen Sun, Shi-Wen Xu
Selenophosphate synthetase (SPS) is essential for selenoprotein biosynthesis. In two SPS paralogues, SPS1 was only cloned from a cDNA library prepared from avian organ. However, the biological function of SPS1 in chicken central nervous system (CNS) remains largely unclear. To investigate the role of avian SPS1 in the development and selenium (Se) homeostasis of CNS, fertile eggs, chicken embryos, embryo neurons and chicks were employed in this study. The response of SPS1 transcription to the development and Se levels of CNS tissues was analyzed using qRT-PCR...
March 16, 2017: Oncotarget
https://www.readbyqxmd.com/read/28414460/analysis-of-novel-interactions-between-components-of-the-selenocysteine-biosynthesis-pathway-sephs1-sephs2-sepsecs-and-secp43
#18
Flore Oudouhou, Bastien Casu, Arnold Steve Dopgwa Puemi, Jurgen Sygusch, Christian Baron
In mammalian cells, the incorporation of the 21st amino acid, selenocysteine, into proteins is guided by the Sec machinery. The function of this protein complex requires several protein-protein and protein-RNA interactions, leading to the incorporation of selenocysteine at UGA codons. It is guided by stem-loop structures localized in the 3' untranslated regions of the selenoprotein-encoding genes. Here, we conducted a global analysis of interactions between the Sec biosynthesis and incorporation components using a bioluminescence resonance energy transfer assay in mammalian cells that showed that selenocysteine synthase (SEPSECS), SECp43, and selenophosphate synthetases SEPHS1 and SEPHS2 form oligomers in eukaryotic cells...
April 20, 2017: Biochemistry
https://www.readbyqxmd.com/read/28412747/selenomethionine-and-methyl-selenocysteine-multiple-dose-pharmacokinetics-in-selenium-replete-men
#19
James R Marshall, Raymond F Burk, Rochelle Payne Ondracek, Kristina E Hill, Marjorie Perloff, Warren Davis, Roberto Pili, Saby George, Raymond Bergan
According to the Nutritional Prevention of Cancer (NPC) trial, a selenized yeast supplement containing selenium, 200 mcg/day, decreased the incidence of total cancer, cancers of the prostate, colon and lung, and cancer mortality. The active agent in the selenized yeast supplement was assumed to be selenomethionine (SEMET), although the supplement had not been well speciated. The SELECT study, largely motivated by the NPC trial, enrolling nearly 40 times as many subjects, showed unequivocally that selenium 200 mcg/day, with selenium in the form of SEMET, does not protect selenium-replete men against prostate or other major cancer...
April 18, 2017: Oncotarget
https://www.readbyqxmd.com/read/28409884/altered-protein-expression-pattern-in-colon-tissue-of-mice-upon-supplementation-with-distinct-selenium-compounds
#20
Jette Rahn, Claudia Lennicke, Anna P Kipp, Andreas S Müller, Ludger A Wessjohann, Rudolf Lichtenfels, Barbara Seliger
The essential trace element Selenium (Se) is controversially discussed concerning its role in health and disease. Its various physiological functions are largely mediated by Se incorporation in the catalytic center of selenoproteins. To gain insights into the impact of Se deficiency and of supplementation with different Se compounds (selenite, selenate, selenomethionine) at defined concentrations (recommended, 150 μg/ kg diet; excessive, 750 μg/ kg diet) in murine colon tissues a twenty week feeding experiment was performed followed by analysis of the protein expression pattern of colon tissue specimens by 2D-DIGE and MALDI-TOF MS...
April 14, 2017: Proteomics
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