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selenoprotein K

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https://www.readbyqxmd.com/read/28506443/endoplasmic-reticulum-resident-selenoproteins-as-regulators-of-calcium-signaling-and-homeostasis
#1
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/28429286/effects-of-selenium-supplementation-on-the-diabetic-condition-depend-on-the-baseline-selenium-status-in-kkay-mice
#2
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/28281222/gene-silencing-of-selenoprotein-k-induces-inflammatory-response-and-activates-heat-shock-proteins-expression-in-chicken-myoblasts
#3
Ruifeng Fan, Haidong Yao, Changyu Cao, Xia Zhao, Ahmed Khalid, Jinxin Zhao, Ziwei Zhang, Shiwen Xu
In the present study, specific small interfering RNA (siRNA) for selenoprotein K (Selk) gene was designed and transfected into chicken myoblasts. Then, the expressions of inflammatory factors (including induced nitric oxide synthase [iNOS], nuclear factor-kappa B [NF-κB], heme-oxygenase-1 [HO-1], cyclooxygenase-2 [COX-2], and prostaglandin E synthase [PTGEs]), inflammation-related cytokines (including interleukin [IL]-1β, IL-6, IL-7, IL-8, IL-17, and interferon [IFN]-γ), and heat shock proteins (HSPs) (including HSP27, HSP40, HSP60, HSP70, and HSP90) were examined at 24 and 72 h after transfection...
March 9, 2017: Biological Trace Element Research
https://www.readbyqxmd.com/read/28130108/selenoprotein-k-modulate-intracellular-free-ca-2-by-regulating-expression-of-calcium-homoeostasis-endoplasmic-reticulum-protein
#4
Chao Wang, Ruimin Li, Yalan Huang, Miao Wang, Fan Yang, Dana Huang, Chunli Wu, Yue Li, Yijun Tang, Renli Zhang, Jinquan Cheng
Selenoprotein K (SelK) is an 11-kDa selenoprotein, which may be involved in the regulation of oxidative stress, endoplasmic reticulum (ER) stress and immune response. To explore the function of SelK in the process of immune response, several short-hairpin RNAs (shRNA) were designed for the construction of recombinant plasmids to down-regulate the expression of SelK gene in vitro. These shRNAs specifically and efficiently interfered with the expression of SelK at both mRNA and protein levels. The expression of calcium homoeostasis endoplasmic reticulum protein (CHERP) and the intracellular free Ca(2+) concentration were significantly down-regulated in anti-CD3 stimulated SelK-knockdown cells...
March 18, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/28101579/role-of-trna-selenocysteine-1-associated-protein-1-in-the-proliferation-and-apoptosis-of-cardiomyocyte%C3%A2-like-h9c2-cells
#5
Meng-Di Li, Wan-Peng Cheng, Min-Xia Shi, Tang-Dong Ge, Xiao-Lin Zheng, Dong-Yuan Wu, Xiao-Yan Hu, Jin-Cheng Luo, Feng-Lan Li, Hui Li
Transfer RNA selenocysteine 1 associated protein 1 (Trnau1ap) serves an essential role in the synthesis of selenoproteins, which have critical functions in numerous biological processes. Selenium deficiency results in a variety of diseases, including cardiac disease. However, the mechanisms underlying myocardial injury induced by selenium deficiency remain unclear. The present study examined the effects of Trnau1ap under‑ and overexpression in cardiomyocyte‑like H9c2 cells, by transfection with small interfering RNA and an overexpression plasmid, respectively...
February 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28088013/delineating-hierarchy-of-selenotranscriptome-expression-and-their-response-to-selenium-status-in-chicken-central-nervous-system
#6
Xiu-Qing Jiang, Chang-Yu Cao, Zhao-Yang Li, Wei Li, Cong Zhang, Jia Lin, Xue-Nan Li, Jing-Long Li
Selenium (Se) incorporated in selenoproteins as selenocysteine and supports various important cellular and organismal functions. We recently reported that chicken brain exhibited high priority for Se supply and retention under conditions of dietary Se deficiency and supernutrition Li et al. (2012) . However, the selenotranscriptome expressions and their response to Se status in chicken central nervous system (CNS) are unclear. To better understand the relationship of Se homeostasis and selenoproteins expression in chicken CNS, 1day-old HyLine White chickens were fed a low Se diet (Se-L, 0...
April 2017: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/28065595/the-influence-of-selenium-status-on-body-composition-oxidative-dna-damage-and-total-antioxidant-capacity-in-newly-diagnosed-type-2-diabetes-mellitus-a-case-control-study
#7
Fatimah Binti Othman, Hamid Jan Bin Jan Mohamed, K N S Sirajudeen, Mohd Fairulnizal B Md Noh, Nor Fadilah Rajab
Selenium is involved in the complex system of defense against oxidative stress in diabetes through its biological function of selenoproteins and the antioxidant enzyme. A case-control study was carried out to determine the association of plasma selenium with oxidative stress and body composition status presented in Type 2 Diabetes Mellitus (T2DM) patient and healthy control. This study involved 82 newly diagnosed T2DM patients and 82 healthy controls. Plasma selenium status was determined with Graphite Furnace Atomic Absorption Spectrometry...
December 29, 2016: Journal of Trace Elements in Medicine and Biology
https://www.readbyqxmd.com/read/27923410/supplementation-with-brazil-nuts-and-green-tea-extract-regulates-targeted-biomarkers-related-to-colorectal-cancer-risk-in-humans
#8
RANDOMIZED CONTROLLED TRIAL
Ying Hu, Graeme H McIntosh, Richard K Le Leu, Roshini Somashekar, Xing Q Meng, Geetha Gopalsamy, Libby Bambaca, Ross A McKinnon, Graeme P Young
Se and green tea have been shown in epidemiological, observational and preclinical studies to be inversely related to the risk of developing colorectal cancer (CRC). However, there are limited studies to evaluate their regulatory effects on genes/proteins that relate to CRC oncogenesis in human subjects, such as selenoproteins, WNT signalling pathway, inflammation and methylation. This study examined the effects of supplementation of Se using Brazil nuts and green tea extract (GTE) capsules, alone and in combination, on targeted biomarkers...
December 2016: British Journal of Nutrition
https://www.readbyqxmd.com/read/27832637/acute-overfeeding-does-not-alter-liver-or-adipose-tissue-derived-cytokines-in-healthy-humans
#9
Miaoxin Chen, Bo Liu, Campbell H Thompson, Gary A Wittert, Leonie K Heilbronn
BACKGROUND/AIMS: The secretions of liver-derived cytokines angiopoietin-like 6, insulin-like growth factor 1, selenoprotein-P and C-reactive protein and adipokines, adiponectin and monocyte chemoattractant protein-1 are altered in obese individuals, and they directly induce insulin resistance in both cellular and animal models. This study is aimed at examining the effects of acute overnutrition on these cytokines in healthy individuals, and identifying association with markers of insulin resistance...
2016: Annals of Nutrition & Metabolism
https://www.readbyqxmd.com/read/27752918/minimum-selenium-requirements-increase-when-repleting-second-generation-selenium-deficient-rats-but-are-not-further-altered-by-vitamin-e-deficiency
#10
Roger A Sunde, Kevin M Thompson, Kevin L Fritsche, Jacqueline K Evenson
Second-generation selenium-deficient weanling rats fed graded levels of dietary Se were used (a) to study the impact of initial Se deficiency on dietary Se requirements; (b) to determine if further decreases in selenoperoxidase expression, especially glutathione peroxidase 4 (Gpx4), affect growth or gross disease; and (c) to examine the impact of vitamin E deficiency on biochemical and molecular biomarkers of Se status. Rats were fed a vitamin E-deficient and Se-deficient crystalline amino acid diet (3 ng Se/g diet) or that diet supplemented with 100 μg/g all-rac-α-tocopheryl acetate and/or 0, 0...
May 2017: Biological Trace Element Research
https://www.readbyqxmd.com/read/27645994/selenoprotein-gene-nomenclature
#11
Vadim N Gladyshev, Elias S Arnér, Marla J Berry, Regina Brigelius-Flohé, Elspeth A Bruford, Raymond F Burk, Bradley A Carlson, Sergi Castellano, Laurent Chavatte, Marcus Conrad, Paul R Copeland, Alan M Diamond, Donna M Driscoll, Ana Ferreiro, Leopold Flohé, Fiona R Green, Roderic Guigó, Diane E Handy, Dolph L Hatfield, John Hesketh, Peter R Hoffmann, Arne Holmgren, Robert J Hondal, Michael T Howard, Kaixun Huang, Hwa-Young Kim, Ick Young Kim, Josef Köhrle, Alain Krol, Gregory V Kryukov, Byeong Jae Lee, Byung Cheon Lee, Xin Gen Lei, Qiong Liu, Alain Lescure, Alexei V Lobanov, Joseph Loscalzo, Matilde Maiorino, Marco Mariotti, K Sandeep Prabhu, Margaret P Rayman, Sharon Rozovsky, Gustavo Salinas, Edward E Schmidt, Lutz Schomburg, Ulrich Schweizer, Miljan Simonović, Roger A Sunde, Petra A Tsuji, Susan Tweedie, Fulvio Ursini, Philip D Whanger, Yan Zhang
The human genome contains 25 genes coding for selenocysteine-containing proteins (selenoproteins). These proteins are involved in a variety of functions, most notably redox homeostasis. Selenoprotein enzymes with known functions are designated according to these functions: TXNRD1, TXNRD2, and TXNRD3 (thioredoxin reductases), GPX1, GPX2, GPX3, GPX4, and GPX6 (glutathione peroxidases), DIO1, DIO2, and DIO3 (iodothyronine deiodinases), MSRB1 (methionine sulfoxide reductase B1), and SEPHS2 (selenophosphate synthetase 2)...
November 11, 2016: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/27601625/selenoprotein-k-regulation-of-palmitoylation-and-calpain-cleavage-of-asap2-is-required-for-efficient-fc%C3%AE-r-mediated-phagocytosis
#12
Robert L Norton, Gregory J Fredericks, Zhi Huang, Jeffrey D Fay, FuKun W Hoffmann, Peter R Hoffmann
Effective activation of macrophages through phagocytic Fcγ receptors (FcγR) has been shown to require selenoprotein K (Selk). We set out to determine whether the FcγR-mediated uptake process itself also requires Selk and potential underlying mechanisms. Macrophages from Selk knockout (KO) mice were less efficient compared with wild-type (WT) controls in engulfing IgG-coated fluorescent beads. Using LC-MS/MS to screen for Selk-binding partners involved in FcγR-mediated phagocytosis, we identified Arf-GAP with SH3 domain, ANK repeat, and PH domain-containing protein 2 (ASAP2)...
September 6, 2016: Journal of Leukocyte Biology
https://www.readbyqxmd.com/read/27588899/selenoprotein-h-is-an-essential-regulator-of-redox-homeostasis-that-cooperates-with-p53-in-development-and-tumorigenesis
#13
Andrew G Cox, Allison Tsomides, Andrew J Kim, Diane Saunders, Katie L Hwang, Kimberley J Evason, Jerry Heidel, Kristin K Brown, Min Yuan, Evan C Lien, Byung Cheon Lee, Sahar Nissim, Bryan Dickinson, Sagar Chhangawala, Christopher J Chang, John M Asara, Yariv Houvras, Vadim N Gladyshev, Wolfram Goessling
Selenium, an essential micronutrient known for its cancer prevention properties, is incorporated into a class of selenocysteine-containing proteins (selenoproteins). Selenoprotein H (SepH) is a recently identified nucleolar oxidoreductase whose function is not well understood. Here we report that seph is an essential gene regulating organ development in zebrafish. Metabolite profiling by targeted LC-MS/MS demonstrated that SepH deficiency impairs redox balance by reducing the levels of ascorbate and methionine, while increasing methionine sulfoxide...
September 20, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27524654/selenoprotein-p-is-elevated-in-individuals-with-obesity-but-is-not-independently-associated-with-insulin-resistance
#14
Miaoxin Chen, Bo Liu, David Wilkinson, Amy T Hutchison, Campbell H Thompson, Gary A Wittert, Leonie K Heilbronn
Selenoprotein P (SeP) is secreted primarily by the liver and postulated to cause insulin resistance. The aim of this study was to measure plasma SeP in individuals who are lean (N=29) or overweight/obese (N=34), and examine relationships between circulating SeP, SEPP1 (SeP, plasma 1) expression in subcutaneous adipose tissue, and markers of insulin resistance. SeP was higher in individuals who were overweight/obese (P<0.001), and associated with insulin resistance by HOMA-IR and by clamp, but not independently of BMI...
March 2017: Obesity Research & Clinical Practice
https://www.readbyqxmd.com/read/27344320/gene-expression-of-selenoproteins-can-be-regulated-by-selenoprotein-k-silencing-in-chicken-myoblasts
#15
Ruifeng Fan, Haidong Yao, Xia Zhao, Changyu Cao, Tianshu Yang, Yilin Luan, Ziwei Zhang, Shiwen Xu
The aim of the present study was to clarify the effect of Selenoprotein K (Selk) silencing on the mRNA expression of 25 selenoproteins in chicken myoblasts. The specific small interfering RNA (siRNA) for Selk gene was designed and transfected into chicken myoblasts. Post-transfection mRNA expression of 25 selenoproteins was determined at various time periods i.e., 24, 48 and 72 h. Moreover, based on the results of expression of 25 selenoproteins, correlation analysis and principal component analysis (PCA) were used for further analysis...
August 2016: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/27275761/human-mir-544a-modulates-selk-expression-in-hepatocarcinoma-cell-lines
#16
Nicoletta Potenza, Filomena Castiello, Marta Panella, Giovanni Colonna, Gennaro Ciliberto, Aniello Russo, Susan Costantini
Hepatocellular carcinoma (HCC) is a multi-factorial cancer with a very poor prognosis; therefore, there are several investigations aimed at the comprehension of the molecular mechanisms leading to development and progression of HCC and at the definition of new therapeutic strategies. We have recently evaluated the expression of selenoproteins in HCC cell lines in comparison with normal hepatocytes. Recent results have shown that some of them are down- and others up-regulated, including the selenoprotein K (SELK), whose expression was also induced by sodium selenite treatment on cells...
2016: PloS One
https://www.readbyqxmd.com/read/27103578/transcriptomics-and-proteomics-show-that-selenium-affects-inflammation-cytoskeleton-and-cancer-pathways-in-human-rectal-biopsies
#17
Catherine Méplan, Ian T Johnson, Abigael C J Polley, Simon Cockell, David M Bradburn, Daniel M Commane, Ramesh P Arasaradnam, Francis Mulholland, Anze Zupanic, John C Mathers, John Hesketh
Epidemiologic studies highlight the potential role of dietary selenium (Se) in colorectal cancer prevention. Our goal was to elucidate whether expression of factors crucial for colorectal homoeostasis is affected by physiologic differences in Se status. Using transcriptomics and proteomics followed by pathway analysis, we identified pathways affected by Se status in rectal biopsies from 22 healthy adults, including 11 controls with optimal status (mean plasma Se = 1.43 μM) and 11 subjects with suboptimal status (mean plasma Se = 0...
August 2016: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/26714931/biological-activity-of-selenium-revisited
#18
REVIEW
Jagoda K Wrobel, Ronan Power, Michal Toborek
Selenium (Se) is an essential micronutrient that exerts multiple and complex effects on human health. Se is essential for human well-being largely due to its potent antioxidant, anti-inflammatory, and antiviral properties. The physiological functions of Se are carried out by selenoproteins, in which Se is specifically incorporated as the amino acid, selenocysteine. Importantly, both beneficial and toxic effects of Se have been reported suggesting that the mode of action of Se is strictly chemical form and concentration dependent...
February 2016: IUBMB Life
https://www.readbyqxmd.com/read/26658762/dna-damage-and-oxidative-stress-response-to-selenium-yeast-in-the-non-smoking-individuals-a-short-term-supplementation-trial-with-respect-to-gpx1-and-sepp1-polymorphism
#19
E Jablonska, S Raimondi, J Gromadzinska, E Reszka, E Wieczorek, M B Krol, A Smok-Pieniazek, M Nocun, M Stepnik, K Socha, M H Borawska, W Wasowicz
PURPOSE: Selenium, both essential and toxic element, is considered to protect against cancer, though human supplementation trials have generated many inconsistent data. Genetic background may partially explain a great variability of the studies related to selenium and human health. The aim of this study was to assess whether functional polymorphisms within two selenoprotein-encoding genes modify the response to selenium at the level of oxidative stress, DNA damage, and mRNA expression, especially in the individuals with a relatively low selenium status...
December 2016: European Journal of Nutrition
https://www.readbyqxmd.com/read/26644468/selenoprotein-expression-in-macrophages-is-critical-for-optimal-clearance-of-parasitic-helminth-nippostrongylus-brasiliensis
#20
Shakira M Nelson, Ashley E Shay, Jamaal L James, Bradley A Carlson, Joseph F Urban, K Sandeep Prabhu
The plasticity of macrophages is evident in helminthic parasite infections, providing protection from inflammation. Previously we demonstrated that the micronutrient selenium induces a phenotypic switch in macrophage activation from a classically activated (pro-inflammatory; M1/CAM) toward an alternatively activated (anti-inflammatory; M2/AAM) phenotype, where cyclooxygenase (COX)-dependent cyclopentenone prostaglandin J2 (15d-PGJ2) plays a key role. Here, we hypothesize that dietary selenium modulates macrophage polarization toward an AAM phenotype to assist in the increasing clearance of adult Nippostrongylus brasiliensis, a gastrointestinal nematode parasite...
February 5, 2016: Journal of Biological Chemistry
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