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Selenium and cancer

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https://www.readbyqxmd.com/read/28917711/crocodiles-and-alligators-antiamoebic-and-antitumor-compounds-of-crocodiles
#1
Ruqaiyyah Siddiqui, Shareni Jeyamogan, Salwa Mansoor Ali, Fatima Abbas, K A Sagathevan, Naveed Ahmed Khan
Crocodiles exist in unsanitary environments, feed on rotten meat, are often exposed to heavy metals such as arsenic, cadmium, cobalt, chromium, mercury, nickel, lead, selenium, tolerate high levels of radiation, and are amid the very few species to survive the catastrophic Cretaceous-Tertiary extinction event, nonetheless they can live for up to a 100 years. Moreover, as they live in unhygienic conditions, they regularly come across pathogens. Logically, we postulate that crocodiles have established mechanisms to defend themselves from noxious agents as well as protecting themselves from pathogens...
September 13, 2017: Experimental Parasitology
https://www.readbyqxmd.com/read/28917054/association-of-single-nucleotide-polymorphisms-in-selenoprotein-genes-with-cancer-risk
#2
Catherine Méplan
Genetic association studies have linked genetic variants in the Selenium (Se) metabolism with the development of complex diseases such as cancer and helped unravel novel mechanisms underlying cancer development. The chapter describes the specificity of genetic variants in the Se metabolism, the approaches used in association studies, and the limitations of such approaches.
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28917044/simultaneous-speciation-of-selenoproteins-and-selenometabolites-in-plasma-and-serum
#3
Belén Callejón-Leblic, Gema Rodríguez-Moro, Tamara García-Barrera, José Luis Gómez-Ariza
Selenium is an essential element incorporated to different proteins with important biological functions in connection to antioxidant activity, cancer-protective properties, neurodegenerative pathologies, and prevention of effects of diabetes, among others. In addition, selenoamino acids play a basic role in the global equilibrium of key selenium-biomolecules synthesis, including selenoprotein P, selenoalbumin, and glutathione peroxidase. Homeostasis of these selenium-containing biomolecules involves different organs in living organisms including human, and bloodstream is the connection fluid in this process...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/28904059/gene-methylation-biomarkers-in-sputum-and-plasma-as-predictors-for-lung-cancer-recurrence
#4
Steven A Belinsky, Shuguang Leng, Guodong Wu, Cynthia L Thomas, Maria A Picchi, Sandra J Lee, Seena Aisner, Suresh Ramalingam, Fadlo R Khuri, Daniel D Karp
Detection of methylated genes in exfoliated cells from the lungs of smokers provides an assessment of the extent of field cancerization, is a validated biomarker for predicting lung cancer, and provides some discrimination when interrogated in blood. The potential utility of this 8-gene methylation panel for predicting tumor recurrence has not been assessed. The Eastern Cooperative Oncology Group initiated a prevention trial (ECOG-ACRIN5597) that enrolled resected Stage I non-small cell lung cancer patients who were randomized 2:1 to receive selenized yeast versus placebo for four years...
September 13, 2017: Cancer Prevention Research
https://www.readbyqxmd.com/read/28900326/the-relationship-between-serum-selenium-and-zinc-with-gastroesophageal-cancers-in-the-southeast-of-iran
#5
Seyed Mehdi Hashemi, Mohamadali Mashhadi, Alireza Ansari Moghaddam, Javad Yousefi, Ahmad Dizangian Mofrad, Masoud Sadeghi, Abolghasem Allahyari
BACKGROUND: Selenium (Se) and zinc (Zn) have antioxidant and anticancer properties. OBJECTIVE: The aim of this study was to evaluate the serum levels of Se and Zn and the correlation between the levels of these two elements with risk of incidence of esophageal cancer (EC) and gastric cancer (GC). MATERIALS AND METHODS: In a case-control study, we selected sixty patients with GC or EC as the intervention group and 120 age-matched individuals as the control group...
April 2017: Indian Journal of Medical and Paediatric Oncology
https://www.readbyqxmd.com/read/28899491/association-between-selenium-and-lycopene-supplementation-and-incidence-of-prostate-cancer-results-from-the-post-hoc-analysis-of-the-procomb-trial
#6
Giuseppe Morgia, Salvatore Voce, Fabiano Palmieri, Marcello Gentile, Gennaro Iapicca, Antonella Giannantoni, Franco Blefari, Marco Carini, Giuseppe Vespasiani, Giorgio Santelli, Salvatore Arnone, Rosaria M Pareo, Giorgio Ivan Russo
BACKGROUND: Many potential chemopreventive agents have been used in PCa prevention, including selenium (Se) and lycopene (Ly). However, their role has been matter of debate over the years, due to potential of promotion of PCa. PURPOSE: In this study we aimed at evaluating the incidence risk of prostate cancer (PCa) in a cohort of patients treated with Se and Ly. METHODS: The Procomb trial design has been previously published (ISRCTN78639965)...
October 15, 2017: Phytomedicine: International Journal of Phytotherapy and Phytopharmacology
https://www.readbyqxmd.com/read/28892302/cancer-targeted-selenium-nanoparticles-sensitize-cancer-cells-to-continuous-%C3%AE-radiation-to-achieve-synergetic-chemo-radiotherapy
#7
Leung Chan, Lizhen He, Binwei Zhou, Shouhai Guan, Mingjun Bo, Yahui Yang, Ying Liu, Xiao Liu, Yanyang Zhang, Qiang Xie, Tianfeng Chen
Cancer radiotherapy with 125I seeds demonstrates long-term higher efficacy and lower side effects than traditional X-ray radiotherapy due to its low-dose and continuous radiation but is still limited by radioresistance in clinical applications. Therefore, the design and synthesis for sensitizers that could enhance the sensitivity of cancer cells to 125I seeds is of great importance for future radiotherapy. Selenium nanoparticles (SeNPs) have been found to exhibit high potential in cancer chemotherapy and as drug carriers...
September 11, 2017: Chemistry, An Asian Journal
https://www.readbyqxmd.com/read/28888463/brazil-nuts-nutritional-composition-health-benefits-and-safety-aspects
#8
REVIEW
Bárbara R Cardoso, Graziela B Silva Duarte, Bruna Z Reis, Silvia M F Cozzolino
Brazil nuts are among the richest selenium food sources, and studies have considered this Amazonian nut as an alternative for selenium supplementation. Besides selenium, Brazil nuts present relevant content of other micronutrients such as magnesium, copper, and zinc. The nutritional composition of nuts, also characterized by adequate fatty acid profile and high content of protein and bioactive compounds, has many health benefits. In the present review, we examine the nutritional composition of Brazil nuts, comparing it with other nuts, and describe the relevance of possible contaminants and metal toxicants observed in this nut for human health...
October 2017: Food Research International
https://www.readbyqxmd.com/read/28885589/the-small-glutathione-peroxidase-mimic-5p-may-represent-a-new-strategy-for-the-treatment-of-liver-cancer
#9
Juxin Yin, Bingmei Wang, Xuejun Zhu, Xiaonan Qu, Yi Huang, Shaowu Lv, Ying Mu, Guimin Luo
Glutathione peroxidase (GPx) is an antioxidant protein containing selenium. Owing to the limitations of native GPx, considerable efforts have been made to develop GPx mimics. Here, a short 5-mer peptides (5P) was synthesized and characterized using matrix-assisted laser desorption ionization time-of-flight mass spectrometry. Enzyme coupled assays were used to evaluate GPx activity. The cell viability and apoptosis of H22 cells were tested, and mice bearing H22 cell-derived tumors were used to determine the effects of 5P on tumor inhibition...
September 8, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28871707/search-for-relevant-indications-for-selenium-supplementation-in-thyroid-diseases
#10
Katarzyna Wojciechowska-Durczynska, Andrzej Lewinski
Selenium plays a significant role in the thyroid function and its deficiency is considered by some authors to be a cause of thyroid disorders. The potential therapeutic influence of selenium supplementation in thyroid disease was investigated in several studies and some results were encouraging, however results were inconsistent and did not allow conclusion to be drawn. For that reason, we have performed a review study on relevance of selenium supplementation in thyroid disease. Till now, there is no strong evidence that selenium supplementation leads to clinical improvement in the course of autoimmune thyroiditis, nodular goitre or thyroid cancer...
August 5, 2017: Neuro Endocrinology Letters
https://www.readbyqxmd.com/read/28871485/inflammatory-response-occurs-in-veins-of-broiler-chickens-treated-with-a-selenium-deficiency-diet
#11
Changyu Cao, Ruifeng Fan, Menghao Chen, Xiaojing Li, Mengyuan Xing, Fating Zhu, Hua Xue, Kai Wang, Shiwen Xu
Selenium (Se) has been indicated to prevent chronic diseases including cancer, cardiovascular disease, and type 2 diabetes. However, a few studies have indicated that Se deficiency can induce vascular diseases. Thus, in the present study, we investigated the effect of Se deficiency on vascular pathology. A total of 60 male broiler chickens were randomly divided into 2 groups (n = 30). The control group (C group) was fed a basic diet, and the Se-deficient group (L group) was fed a Se-deficient, corn-soy-based diet...
September 4, 2017: Biological Trace Element Research
https://www.readbyqxmd.com/read/28853476/synthesis-and-evaluation-of-selenium-containing-indole-chalcone-and-diarylketone-derivatives-as-tubulin-polymerization-inhibition-agents
#12
Shun Zhang, Baijiao An, Jiayan Li, Jinhui Hu, Ling Huang, Xingshu Li, Albert S C Chan
Sixteen new selenium-containing indole chalcone and diarylketone derivatives were synthesized and evaluated as tubulin polymerization inhibitors. Among them, compound 25b exhibited the most potent antiproliferative activities against six human cancer cell lines with IC50 values of 0.004-0.022 μM. A microtubule dynamics assay and an immunofluorescence assay confirmed that 25b could effectively inhibit tubulin polymerization (IC50 = 2.1 ± 0.27 μM). Further cellular mechanism studies revealed that 25b induced G2/M phase arrest, which was further evidenced by the decrease in the mitochondrial membrane potential (MMP)...
September 13, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/28842587/methylseleninic-acid-provided-at-nutritional-selenium-levels-inhibits-angiogenesis-by-down-regulating-integrin-%C3%AE-3-signaling
#13
Zhihui Cai, Liangbo Dong, Chengwei Song, Yanqing Zhang, Chenghui Zhu, Yibo Zhang, Qinjie Ling, Peter R Hoffmann, Jun Li, Zhi Huang, Wei Li
Targeting angiogenesis has emerged as a promising strategy for cancer treatment. Methylseleninic acid (MSA) is a metabolite of selenium (Se) in animal cells that exhibits anti-oxidative and anti-cancer activities at levels exceeding Se nutritional requirements. However, it remains unclear whether MSA exerts its effects on cancer prevention by influencing angiogenesis within Se nutritional levels. Herein, we demonstrate that MSA inhibited angiogenesis at 2 µM, which falls in the range of moderate Se nutritional status...
August 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28798983/role-of-aqp9-in-transport-of-monomethyselenic-acid-and-selenite
#14
Xiangrong Geng, Joseph McDermott, Joseph Lundgren, Liu Liu, Kan-Jen Tsai, Jian Shen, Zijuan Liu
AQP9 is an aquaglyceroporin with a very broad substrate spectrum. In addition to its orthodox nutrient substrates, AQP9 also transports multiple neutral and ionic arsenic species including arsenic trioxide, monomethylarsenous acid (MAs(III)) and dimethylarsenic acid (DMA(V)). Here we discovered a new group of AQP9 substrates which includes two clinical relevant selenium species. We showed that AQP9 efficiently transports monomethylselenic acid (MSeA) with a preference for acidic pH, which has been demonstrated in Xenopus laevis oocyte following the overexpression of human AQP9...
August 10, 2017: Biometals: An International Journal on the Role of Metal Ions in Biology, Biochemistry, and Medicine
https://www.readbyqxmd.com/read/28792756/design-synthesis-and-biological-evaluation-of-novel-selenium-containing-isocombretastatins-and-phenstatins-as-antitumor-agents
#15
Yanqing Pang, Baijiao An, Lanlan Lou, Junsheng Zhang, Jun Yan, Ling Huang, Xingshu Li, Sheng Yin
Two series of structurally related organoselenium compounds designed by fusing the anticancer agent methyl(phenyl)selane into the tubulin polymerization inhibitors isocombretastatins or phenstatins were synthesized and evaluated for antiproliferative activity. Most of these selenium containing hybrids exhibited potent cytotoxicity against a panel of cancel cell lines, with IC50 values in the submicromolar concentration range. Among them, 11a, the 3-methylseleno derivative of isocombretastatin A-4 (isoCA-4) represented the most active compound with IC50 values of 2-34 nM against 12 cancer cell lines, including two drug-resistant cell lines...
August 23, 2017: Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28767087/novel-methylselenoesters-as-antiproliferative-agents
#16
Nuria Díaz-Argelich, Ignacio Encío, Daniel Plano, Aristi P Fernandes, Juan Antonio Palop, Carmen Sanmartín
Selenium (Se) compounds are potential therapeutic agents in cancer. Importantly, the biological effects of Se compounds are exerted by their metabolites, with methylselenol (CH₃SeH) being one of the key executors. In this study, we developed a new series of methylselenoesters with different scaffolds aiming to modulate the release of CH₃SeH. The fifteen compounds follow Lipinski's Rule of Five and with exception of compounds 1 and 14, present better drug-likeness values than the positive control methylseleninic acid...
August 2, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/28760425/influence-of-selenium-supplementation-on-patients-with-inflammation-a-pilot-double-blind-randomized-study
#17
Renata Germano Borges de Oliveira Nascimento Freitas, Roberto José Negrão Nogueira, Silvia Maria Franciscato Cozzolino, Ana Carolina Junqueira Vasques, Gabriel Hessel
OBJECTIVE: The aim of the study was to analyze the effect of selenium supplementation on patients with inflammation receiving PN. METHODS: This double-blind randomized study included 20 hospitalized patients experiencing an inflammatory process while being fed by PN, who were monitored in three stages: first 72 h (0), day 7 (1), and day 14 (2) of PN. The supplemented patients group (G+S) received 60 μg/d (0.75 μmol) of selenium as selenious acid which was added to the PN bag...
September 2017: Nutrition
https://www.readbyqxmd.com/read/28759701/pharmacological-interventions-for-preventing-dry-mouth-and-salivary-gland-dysfunction-following-radiotherapy
#18
REVIEW
Philip Riley, Anne-Marie Glenny, Fang Hua, Helen V Worthington
BACKGROUND: Salivary gland dysfunction is an 'umbrella' term for the presence of either xerostomia (subjective sensation of dryness), or salivary gland hypofunction (reduction in saliva production). It is a predictable side effect of radiotherapy to the head and neck region, and is associated with a significant impairment of quality of life. A wide range of pharmacological interventions, with varying mechanisms of action, have been used for the prevention of radiation-induced salivary gland dysfunction...
July 31, 2017: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/28757135/synergism-between-thioredoxin-reductase-inhibitor-ethaselen-and-sodium-selenite-in-inhibiting-proliferation-and-inducing-death-of-human-non-small-cell-lung-cancer-cells
#19
Xiaoqing Zheng, Wei Xu, Ruoxuan Sun, Hanwei Yin, Chaoran Dong, Huihui Zeng
New effective treatment for human non-small cell lung cancer (NSCLC) is needed. The thioredoxin (Trx) system composes of thioredoxin reductase (TrxR), Trx and NADPH. In this study, we combined an organic selenium compound--TrxR inhibitor ethaselen (BBSKE) with low dosage sodium selenite to inhibit proliferation and induce death of NSCLC cells, and identified underlying mechanisms. Synergistic anti-proliferation effect of BBSKE and selenite was found in human NSCLC cell lines, A549, NCI-H1299 and NCI-1266. A significant increase of apoptosis, necrosis and autophagy were observed in the group of BBSKE plus selenite in A549 cells...
July 27, 2017: Chemico-biological Interactions
https://www.readbyqxmd.com/read/28756617/antioxidant-vitamin-and-mineral-supplements-for-preventing-age-related-macular-degeneration
#20
REVIEW
Jennifer R Evans, John G Lawrenson
BACKGROUND: There is inconclusive evidence from observational studies to suggest that people who eat a diet rich in antioxidant vitamins (carotenoids, vitamins C, and E) or minerals (selenium and zinc) may be less likely to develop age-related macular degeneration (AMD). OBJECTIVES: To determine whether or not taking antioxidant vitamin or mineral supplements, or both, prevent the development of AMD. SEARCH METHODS: We searched the Cochrane Central Register of Controlled Trials (CENTRAL) (which contains the Cochrane Eyes and Vision Trials Register) (2017, Issue 2), MEDLINE Ovid (1946 to 29 March 2017), Embase Ovid (1947 to 29 March 2017), AMED (Allied and Complementary Medicine Database) (1985 to 29 March 2017), OpenGrey (System for Information on Grey Literature in Europe) (www...
July 30, 2017: Cochrane Database of Systematic Reviews
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