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Selenium and cancer

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https://www.readbyqxmd.com/read/29777993/toenail-selenium-genetic-variation-in-selenoenzymes-and-risk-and-outcome-in-glioma
#1
Noah C Peeri, Jordan H Creed, Gabriella M Anic, Reid C Thompson, Jeffrey J Olson, Renato V LaRocca, Sajeel A Chowdhary, John D Brockman, Travis A Gerke, L Burton Nabors, Kathleen M Egan
BACKGROUND: Selenium is an essential trace element obtained through diet that plays a critical role in DNA synthesis and protection from oxidative damage. Selenium intake and polymorphisms in selenoproteins have been linked to the risk of certain cancers though data for glioma are sparse. METHODS: In a case-control study of glioma, we examined the associations of selenium in toenails and genetic variants in the selenoenzyme pathway with the risk of glioma and patient survival...
May 16, 2018: Cancer Epidemiology
https://www.readbyqxmd.com/read/29775743/redox-regulation-of-protein-kinase-c-by-selenometabolites-and-selenoprotein-thioredoxin-reductase-limits-cancer-prevention-by-selenium
#2
REVIEW
Rayudu Gopalakrishna, Usha Gundimeda, Sarah Zhou, Bui Helena, Arne Holmgren
The cancer-preventive mechanism of selenium should address the way low concentrations of selenometabolites react with cellular targets without being diffused from the sites of generation, the way selenium selectively kills tumor cells, and the intriguing U-shaped curve that is seen with dietary supplementation of selenium and cancer prevention. Protein kinase C (PKC), a receptor for tumor promoters, is well suited for this mechanism. Due to the catalytic redox cycle, low concentrations of methylselenol, a postulated active metabolite of selenium, react with the tumor-promoting lipid hydroperoxide bound to PKC to form methylseleninic acid (MSA), which selectively reacts with thiol residues present within the vicinity of the PKC catalytic domain to inactivate it...
May 15, 2018: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/29773186/association-between-cadmium-and-androgen-receptor-protein-expression-differs-in-prostate-tumors-of-african-american-and-european-american-men
#3
Christine M Neslund-Dudas, Russell B McBride, Ashoka Kandegedara, Benjamin A Rybicki, Oleksandr N Kryvenko, Dhananjay Chitale, Nilesh Gupta, Sean R Williamson, Craig G Rogers, Carlos Cordon-Cardo, Andrew G Rundle, Albert M Levin, Q Ping Dou, Bharati Mitra
Cadmium is a known carcinogen that has been implicated in prostate cancer, but how it affects prostate carcinogenesis in humans remains unclear. Evidence from basic science suggests that cadmium can bind to the androgen receptor causing endocrine disruption. The androgen receptor is required for normal prostate development and is the key driver of prostate cancer progression. In this study, we examined the association between cadmium content and androgen receptor protein expression in prostate cancer tissue of African American (N = 22) and European American (N = 30) men...
July 2018: Journal of Trace Elements in Medicine and Biology
https://www.readbyqxmd.com/read/29771500/rational-design-of-cancer-targeted-selenadiazole-derivative-as-efficient-radiosensitizer-for-precise-cancer-therapy
#4
Delong Zeng, Shulin Deng, Chengcheng Sang, Jianfu Zhao Zhao, Tianfeng Chen
Chemical drug design based on the biochemical characteristics of cancer cells has become an important strategy for discovery of targeted therapies for personalized cancer medicine. Herein, cancer targeting RGD peptide has been covalently conjugated to selenadiazole derivative (RGD-SeD) to improve its cancer selectivity. The RGD decoration significantly enhances the anticancer efficacy of RGD-SeD in αVβ3 integrin-overexpressing HepG2 liver cancer cells, but not in normal liver cells. Cellular uptake assay and fluorescent imaging confirmed the selectivity of RGD-SeD to integrin overexpressing cancer cells...
May 17, 2018: Bioconjugate Chemistry
https://www.readbyqxmd.com/read/29758013/selenium-dependent-antioxidant-enzymes-actions-and-properties-of-selenoproteins
#5
REVIEW
Evangelos Zoidis, Isidoros Seremelis, Nikolaos Kontopoulos, Georgios P Danezis
Unlike other essential trace elements that interact with proteins in the form of cofactors, selenium (Se) becomes co-translationally incorporated into the polypeptide chain as part of 21st naturally occurring amino acid, selenocysteine (Sec), encoded by the UGA codon. Any protein that includes Sec in its polypeptide chain is defined as selenoprotein. Members of the selenoproteins family exert various functions and their synthesis depends on specific cofactors and on dietary Se. The Se intake in productive animals such as chickens affect nutrient utilization, production performances, antioxidative status and responses of the immune system...
May 14, 2018: Antioxidants (Basel, Switzerland)
https://www.readbyqxmd.com/read/29751099/translation-regulation-of-mammalian-selenoproteins
#6
REVIEW
Caroline Vindry, Théophile Ohlmann, Laurent Chavatte
BACKGROUND: Interest in selenium research has considerably grown over the last decades owing to the association of selenium deficiencies with an increased risk of several human diseases, including cancers, cardiovascular disorders and infectious diseases. The discovery of a genetically encoded 21st amino acid, selenocysteine, is a fascinating breakthrough in molecular biology as it is the first addition to the genetic code deciphered in the 1960s. Selenocysteine is a structural and functional analog of cysteine, where selenium replaces sulfur, and its presence is critical for the catalytic activity of selenoproteins...
May 8, 2018: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29748931/selenium-nanoparticles-induce-the-chemo-sensitivity-of-fluorouracil-nanoparticles-in-breast-and-colon-cancer-cells
#7
Ahmed A Abd-Rabou, Aziza B Shalby, Hanaa H Ahmed
Drug resistance is a major challenge of breast and colon cancer therapies leading to treatment failure. The main objective of the current study is to investigate whether selenium nanoparticles (nano-Se) can induce the chemo-sensitivity of 5-fluorouracil (FU)-encapsulated poly (D, L-lactide-co-glycolide) nanoparticles (nano-FU) in breast and colon cancer cell lines. Nano-Se and nano-FU were synthesized and characterized, then applied individually or in combination upon MCF7, MDA-MB-231, HCT 116, and Caco-2 cancerous cell lines...
May 11, 2018: Biological Trace Element Research
https://www.readbyqxmd.com/read/29746900/organic-selenium-compounds-as-potential-chemotherapeutic-agents-for-improved-cancer-treatment
#8
REVIEW
Valentina Gandin, Prajakta Khalkar, Jeremy Braude, Aristi P Fernandes
Selenium(Se)-containing compounds have attracted a growing interest as anticancer agents over recent decades, with mounting reports demonstrating their high efficacy and selectivity against cancer cells. Typically, Se compounds exert their cytotoxic effects by acting as pro-oxidants that alter cellular redox homeostasis. However, the precise intracellular targets, signaling pathways affected and mechanisms of cell death engaged following treatment vary with the chemical properties of the selenocompound and its metabolites, as well as the cancer model that is used...
May 7, 2018: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/29715549/selenophosphate-synthetase-1-and-its-role-in-redox-homeostasis-defense-and-proliferation
#9
REVIEW
Jiwoon Na, Jisu Jung, Jeyoung Bang, Qiao Lu, Bradley A Carlson, Xiong Guo, Vadim N Gladyshev, Jinhong Kim, Dolph L Hatfield, Byeong Jae Lee
Selenophosphate synthetase (SEPHS) synthesizes selenophosphate, the active selenium donor, using ATP and selenide as substrates. SEPHS was initially identified and isolated from bacteria and has been characterized in many eukaryotes and archaea. Two SEPHS paralogues, SEPHS1 and SEPHS2, occur in various eukaryotes, while prokaryotes and archaea have only one form of SEPHS. Between the two isoforms in eukaryotes, only SEPHS2 shows catalytic activity during selenophosphate synthesis. Although SEPHS1 does not contain any significant selenophosphate synthesis activity, it has been reported to play an essential role in regulating cellular physiology...
April 28, 2018: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/29712557/association-of-apolipoprotein-e-gene-polymorphisms-with-blood-lipids-and-their-interaction-with-dietary-factors
#10
Israa M Shatwan, Kristian Hillert Winther, Basma Ellahi, Peter Elwood, Yoav Ben-Shlomo, Ian Givens, Margaret P Rayman, Julie A Lovegrove, Karani S Vimaleswaran
BACKGROUND: Several candidate genes have been identified in relation to lipid metabolism, and among these, lipoprotein lipase (LPL) and apolipoprotein E (APOE) gene polymorphisms are major sources of genetically determined variation in lipid concentrations. This study investigated the association of two single nucleotide polymorphisms (SNPs) at LPL, seven tagging SNPs at the APOE gene, and a common APOE haplotype (two SNPs) with blood lipids, and examined the interaction of these SNPs with dietary factors...
April 30, 2018: Lipids in Health and Disease
https://www.readbyqxmd.com/read/29708719/targetable-mesoporous-silica-nanoprobes-for-mapping-the-subcellular-distribution-of-h2se-in-cancer-cells
#11
Bo Hu, Ranran Cheng, Xiaonan Gao, Xiaohong Pan, Fanpeng Kong, Xiaojun Liu, Kehua Xu, Bo Tang
Hydrogen selenide (H2Se), as a highly-active reductant, is believed as a key molecule in the cytotoxicity of inorganic selenium compounds. However, the detail mechanism has hardly been studied, since the distribution of H2Se in the subcellular organelles remains unclear. Herein, we exploited a series of novel targetable mesoporous silica nanoplatforms to map the distribution of H2Se in cytoplasm, lysosome and mitochondria of cancer cells. The subcellular targeting moiety conjugated mesoporous silica nanoparticles (MSNs) were assembled with a small-molecule fluorescent probe (NIR-H2Se) for imaging endogenous H2Se in the corresponding organelles...
April 30, 2018: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29699810/characterization-of-folic-acid-surface-coated-selenium-nanoparticles-and-corresponding-in-vitro-and-in-vivo-effects-against-breast-cancer
#12
Ahmad Reza Shahverdi, Faranak Shahverdi, Elnaz Faghfuri, Mohammad Reza Khoshayand, Faranak Mavandadnejad, Mohammad Hossein Yazdi, Mohsen Amini
BACKGROUNDS AND AIMS: Selenium nanoparticles (SeNPs) have been reported to exhibit an inhibitory effect on cancer cells. In the present study, we aimed to compare the in vitro and in vivo effects of SeNPs and folic acid surface-coated selenium nanoparticles (FA@SeNPs) on breast cancer. METHODS: FA@SeNPs and SeNPs were chemically synthesized and characterized with different instrumental techniques. The cytotoxicity of both nanomaterials was evaluated against 4T1 cells...
April 23, 2018: Archives of Medical Research
https://www.readbyqxmd.com/read/29687875/evaluation-of-thyroid-nodule-characteristics-in-subclinical-hypothyroid-patients-under-a-myo-inositol-plus-selenium-treatment
#13
M Nordio, S Basciani
OBJECTIVE: The anticancer effect of myo-inositol (MI) is catching researchers' attention worldwide. Thyroid nodules (TNs) have been detected by ultrasound (US) in up to 76% of the general population and, although most of them are benign, thyroid cancer is the most common malignancy of the endocrine system. PATIENTS AND METHODS: A retrospective, observational study was conducted in 642 patients with suspected hypothyroidism undergoing US. The analysis was addressed exclusively to patients with subclinical hypothyroidism (SCH) or thyroid-stimulating hormone (TSH) levels borderline associated to TNs classified as class I and II; 1 group (control, no...
April 2018: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/29674262/cancer-incidence-following-long-term-consumption-of-drinking-water-with-high-inorganic-selenium-content
#14
Marco Vinceti, Massimo Vicentini, Lauren A Wise, Claudio Sacchettini, Carlotta Malagoli, Paola Ballotari, Tommaso Filippini, Marcella Malavolti, Paolo Giorgi Rossi
Selenium, a trace element to which humans are exposed mainly through diet, has been involved in the etiology of human cancer. We investigated the long-term effects of selenium exposure on cancer incidence using data from a natural experiment in Northern Italy. During the 1970s-1980s, in a part of the Italian municipality of Reggio Emilia, residents were inadvertently exposed to unusually high levels of inorganic hexavalent selenium (selenate) through drinking water. We followed the exposed residents for 28years, generating data on incidence (when available) and mortality rates for selected cancer sites; the remaining municipal residents comprised the unexposed (reference) group...
April 16, 2018: Science of the Total Environment
https://www.readbyqxmd.com/read/29668110/phenylbutyl-isoselenocyanate-induces-reactive-oxygen-species-to-inhibit-androgen-receptor-and-to-initiate-p53-mediated-apoptosis-in-lncap-prostate-cancer-cells
#15
Wei Wu, Deepkamal Karelia, Kartick Pramanik, Shantu G Amin, Arun K Sharma, Cheng Jiang, Junxuan Lu
Previous studies have established the in vivo bioavailability and efficacious dosages of phenylbutyl isoselenocyanate (ISC-4), a selenium-substituted isothiocyanate, against mouse xenograft models of human melanoma and colorectal cancer. To explore its potential attributes against prostate cancer, we treated human LNCaP prostate cancer cells with ISC-4 and examined their apoptosis responses, and interrogated the signaling mechanisms through pharmacological and siRNA knockdown approaches. Our results show that ISC-4 was more potent at inducing apoptosis than its sulfur analog phenylbutyl isothiocyanate (PBITC) without suppressing protein kinase AKT Ser473 phosphorylation...
April 18, 2018: Molecular Carcinogenesis
https://www.readbyqxmd.com/read/29663923/selenium-and-iron-oxide-nanocomposites-for-magnetically-targeted-anti-cancer-applications
#16
Halla Laufey Hauksdóttir, Thomas J Webster
Iron oxide nanoparticles (IONP) are already well-established in the medical field due to their ability to improve contrast in magnetic resonance imaging (MRI) and for their external magnetic control in the body. Moreover, selenium has been shown to kill numerous cancer cells at lower concentrations that IONP (e.g., 1 μg/ml). Selenium is a trace mineral of growing interest in cancer treatment since it is an essential nutrient in the human body and can interfere with thiolcontaining proteins necessary for cancer cells to function...
March 1, 2018: Journal of Biomedical Nanotechnology
https://www.readbyqxmd.com/read/29660373/selenium-regulated-hierarchy-of-human-selenoproteome-in-cancerous-and-immortalized-cells-lines
#17
Zahia Touat-Hamici, Anne-Laure Bulteau, Juliusz Bianga, Hélène Jean-Jacques, Joanna Szpunar, Ryszard Lobinski, Laurent Chavatte
BACKGROUND: Selenoproteins (25 genes in human) co-translationally incorporate selenocysteine using a UGA codon, normally used as a stop signal. The human selenoproteome is primarily regulated by selenium bioavailability with a tissue-specific hierarchy. METHODS: We investigated the hierarchy of selenoprotein expression in response to selenium concentration variation in four cell lines originating from kidney (HEK293, immortalized), prostate (LNCaP, cancer), skin (HaCaT, immortalized) and liver (HepG2, cancer), using complementary analytical methods...
April 13, 2018: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29652817/selenium-in-radiation-oncology-15-years-of-experiences-in-germany
#18
REVIEW
Ralph Muecke, Oliver Micke, Lutz Schomburg, Jens Buentzel, Klaus Kisters, Irenaeus A Adamietz
Introduction: Se measurement and supplementation in radiation oncology is a controversial issue. The German Working Group Trace Elements and Electrolytes in Oncology (AKTE) has conducted a number of studies on this issue, which are summarized in this review. Strategies have been tested and developed, aiming to stratify the patients with a potential need for supplemental Se and how best to monitor Se supplementation with respect to health effects and risks. Methods: We analyzed blood and tissue Se-levels of different tumor patients ( n = 512)...
April 13, 2018: Nutrients
https://www.readbyqxmd.com/read/29617851/effects-of-nutrition-intervention-on-total-and-cancer-mortality-25-year-post-trial-follow-up-of-the-5-25-year-linxian-nutrition-intervention-trial
#19
Shao-Ming Wang, Philip R Taylor, Jin-Hu Fan, Ruth M Pfeiffer, Mitchell H Gail, He Liang, Gwen A Murphy, Sanford M Dawsey, You-Lin Qiao, Christian C Abnet
Background: A beneficial effect of supplementation with selenium, vitamin E, and beta-carotene was observed on total and cancer mortality in a Chinese population, and it endured for 10 years postintervention, but longer durability is unknown. Methods: A randomized, double-blind, placebo-controlled trial was conducted in Linxian, China, from 1986 to 1991; 29 584 residents age 40 to 69 years received daily supplementations based on a factorial design: Factors A (retinol/zinc), B (riboflavin/niacin), C (vitamin C/molybdenum), and/or D (selenium/vitamin E/beta-carotene), or placebo for 5...
April 3, 2018: Journal of the National Cancer Institute
https://www.readbyqxmd.com/read/29588583/sirna-loaded-selenium-nanoparticle-modified-with-hyaluronic-acid-for-enhanced-hepatocellular-carcinoma-therapy
#20
Yu Xia, Min Guo, Tiantian Xu, Yinghua Li, Changbing Wang, Zhengfang Lin, Mingqi Zhao, Bing Zhu
Background: Small interfering RNA (siRNA) as a new therapeutic modality holds promise for cancer treatment. However, the traditional viral carriers are prone to immunogenicity and risk of insertional mutagenesis. Methods: In order to provide a tumor-targeted delivery carrier of siRNA in cancer therapy, the hyaluronic acid (HA)-selenium (Se)-polyethylenimine (PEI) nanoparticle (NP) was fabricated by decorating SeNP with HA as a tumor-targeting moiety and by linking the polycationic polymers polyethylenimine PEI onto the surface of SeNP...
2018: International Journal of Nanomedicine
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