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prostate cancer selenium

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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
#1
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/29660373/selenium-regulated-hierarchy-of-human-selenoproteome-in-cancerous-and-immortalized-cells-lines
#2
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
#3
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/29535818/selenium-binding-protein-1-is-down-regulated-in-malignant-melanoma
#4
Mandy Schott, Miriam M de Jel, Julia C Engelmann, Philipp Renner, Edward K Geissler, Anja K Bosserhoff, Silke Kuphal
Selenium-binding protein 1 (SELENBP1) expression is reduced in various epithelial cancer entities compared to corresponding normal tissue and has already been described as a tumor suppressor involved in the regulation of cell proliferation, senescence, migration and apoptosis. We identified SELENBP1 to be down-regulated in cutaneous melanoma, a malignant cancer of pigment-producing melanocytes in the skin, which leads to the assumption that SELENBP1 also functions as tumor suppressor in the skin, as shown by others e...
February 13, 2018: Oncotarget
https://www.readbyqxmd.com/read/29471004/prostate-cancer-chemoprevention-by-natural-agents-clinical-evidence-and-potential-implications
#5
Gagan Chhabra, Chandra K Singh, Mary Ann Ndiaye, Samantha Fedorowicz, Arielle Molot, Nihal Ahmad
Prostate cancer (PCa) is the most common non-skin cancer and the second leading cause of cancer-related deaths in American men. Due to its long latency period, PCa is considered as an ideal cancer type for chemopreventive interventions. Chemopreventive agents include various natural or synthetic agents that prevent or delay cancer development, progression and/or recurrence. Pre-clinical studies suggest that many natural products and dietary agents have chemopreventive properties. However, a limited number of these agents have been tested in clinical trials, with varying success...
February 19, 2018: Cancer Letters
https://www.readbyqxmd.com/read/29376219/selenium-for-preventing-cancer
#6
REVIEW
Marco Vinceti, Tommaso Filippini, Cinzia Del Giovane, Gabriele Dennert, Marcel Zwahlen, Maree Brinkman, Maurice Pa Zeegers, Markus Horneber, Roberto D'Amico, Catherine M Crespi
BACKGROUND: This review is the third update of the Cochrane review "Selenium for preventing cancer". Selenium is a naturally occurring element with both nutritional and toxicological properties. Higher selenium exposure and selenium supplements have been suggested to protect against several types of cancer. OBJECTIVES: To gather and present evidence needed to address two research questions:1. What is the aetiological relationship between selenium exposure and cancer risk in humans?2...
January 29, 2018: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/29375002/bioactive-compounds-of-the-mediterranean-diet-and-prostate-cancer
#7
Olga López-Guarnido, Noelia Urquiza-Salvat, Maria Saiz, David Lozano-Paniagua, Lourdes Rodrigo, Manrique Pascual-Geler, Jose Antonio Lorente, Maria Jesus Alvarez-Cubero, Ana Rivas
OBJECTIVE: The purpose of this review is to examine the evidence on the effects of bioactive constituents of the Mediterranean diet (MeDi) on prostate cancer (PCa) risk. METHODS: The search for articles came from extensive research in the following databases: PubMed, Scopus, and Web of Science. We used the search terms "Mediterranean diet," "lycopene," "vitamin E," "vitamin C," "Selenium," "resveratrol," "prostate cancer," and combinations, such as "lycopene and prostate cancer" or "resveratrol and prostate cancer...
January 27, 2018: Aging Male: the Official Journal of the International Society for the Study of the Aging Male
https://www.readbyqxmd.com/read/29360138/interventions-to-reduce-acute-and-late-adverse-gastrointestinal-effects-of-pelvic-radiotherapy-for-primary-pelvic-cancers
#8
REVIEW
Theresa A Lawrie, John T Green, Mark Beresford, Linda Wedlake, Sorrel Burden, Susan E Davidson, Simon Lal, Caroline C Henson, H Jervoise N Andreyev
BACKGROUND: An increasing number of people survive cancer but a significant proportion have gastrointestinal side effects as a result of radiotherapy (RT), which impairs their quality of life (QoL). OBJECTIVES: To determine which prophylactic interventions reduce the incidence, severity or both of adverse gastrointestinal effects among adults receiving radiotherapy to treat primary pelvic cancers. SEARCH METHODS: We conducted searches of CENTRAL, MEDLINE, and Embase in September 2016 and updated them on 2 November 2017...
January 23, 2018: Cochrane Database of Systematic Reviews
https://www.readbyqxmd.com/read/29314169/correlations-of-selenof-and-selenop-genotypes-with-serum-selenium-levels-and-prostate-cancer
#9
Dede N Ekoue, Emmanuel Ansong, Li Liu, Virgilia Macias, Ryan Deaton, Craig Lacher, Matthew Picklo, Larisa Nonn, Peter H Gann, Andre Kajdacsy-Balla, Gail S Prins, Vincent L Freeman, Alan M Diamond
BACKGROUND: Selenium status is inversely associated with the incidence of prostate cancer. However, supplementation trials have not indicated a benefit of selenium supplementation in reducing cancer risk. Polymorphisms in the gene encoding selenoprotein 15 (SELENOF) are associated with cancer incidence/mortality and present disproportionately in African Americans. Relationships among the genotype of selenoproteins implicated in increased cancer risk, selenium status, and race with prostate cancer were investigated...
March 2018: Prostate
https://www.readbyqxmd.com/read/29305107/five-threads-how-u-shaped-thinking-weaves-together-dogs-men-selenium-and-prostate-cancer-risk
#10
REVIEW
David J Waters, Emily C Chiang
Prostate cancer is one of the leading causes of cancer-related mortality among men living in developed countries, making the development of safe, practical approaches to prostate cancer risk reduction a high research priority. The relationship between prostate cancer risk and selenium, an essential nutrient required for a number of metabolically important enzymes including glutathione peroxidases, has been investigated, but a satisfactory integration of results has proven elusive. Dogs, like men, naturally develop prostate cancer during aging, providing an appropriate context to study the effects of selenium supplementation on the dysregulation of homeostasis that drives cancer development within the aging prostate...
January 2, 2018: Free Radical Biology & Medicine
https://www.readbyqxmd.com/read/29301214/synthesis-of-selenium-quinone-hybrid-compounds-with-potential-antitumor-activity-via-rh-catalyzed-c-h-bond-activation-and-click-reactions
#11
Guilherme A M Jardim, Daisy J B Lima, Wagner O Valença, Daisy J B Lima, Bruno C Cavalcanti, Claudia Pessoa, Jamal Rafique, Antonio L Braga, Claus Jacob, Eufrânio N da Silva Júnior, Eduardo H G da Cruz
In continuation of our quest for new redox-modulating catalytic antitumor molecules, selenium-containing quinone-based 1,2,3-triazoles were synthesized using rhodium-catalyzed C-H bond activation and click reactions. All compounds were evaluated against five types of cancer cell lines: HL-60 (human promyelocytic leukemia cells), HCT-116 (human colon carcinoma cells), SF295 (human glioblastoma cells), NCIH-460 (human lung cells) and PC3 (human prostate cancer cells). Some compounds showed good activity with IC50 values below 1 µM...
December 30, 2017: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29176677/organoids-model-distinct-vitamin-e-effects-at-different-stages-of-prostate-cancer-evolution
#12
Rose N Njoroge, Kenji Unno, Jonathan C Zhao, Anum F Naseem, Jonathan F Anker, Warren A McGee, Larisa Nonn, Sarki A Abdulkadir
Vitamin E increased prostate cancer risk in the Selenium and Vitamin E Cancer Prevention Trial (SELECT) through unknown mechanisms while Selenium showed no efficacy. We determined the effects of the SELECT supplements on benign (primary), premalignant ( RWPE-1) and malignant (LNCaP) prostate epithelial organoids. While the supplements decreased proliferation and induced cell death in cancer organoids, they had no effect on the benign organoids. In contrast, Vitamin E enhanced cell proliferation and survival in the premalignant organoids in a manner that recapitulated the SELECT results...
November 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29098222/copper-catalyzed-chalcogenation-of-imidazoheterocycles-with-sulfur-selenium-powder-and-coumarinyl-triflates
#13
Tao Guo, Xu-Ning Wei, Hong-Yan Wang, Ying-Li Zhu, Yun-Hui Zhao, Yong-Cheng Ma
An efficient and convenient copper-catalyzed chalcogenation of imidazoheterocycles with sulfur/selenium powder and coumarinyl triflates has been described. This procedure provides a wide range of structurally diverse coumarinylthio-/coumarinylseleno-substituted imidazoheterocycles in good yields and with good functional group tolerance. Biological evaluation showed that the newly synthesized compound 6d possesses significant in vitro antiproliferative activities against human-derived esophageal, breast, stomach, and prostate cancer cell lines compared with the positive control, 5-fluorouracil...
November 15, 2017: Organic & Biomolecular Chemistry
https://www.readbyqxmd.com/read/29054414/the-epidemiology-of-selenium-and-human-cancer
#14
Marco Vinceti, Tommaso Filippini, Silvia Cilloni, Catherine M Crespi
The relation between selenium and cancer has been one of the most hotly debated topics in human health over the last decades. Early observational studies reported an inverse relation between selenium exposure and cancer risk. Subsequently, randomized controlled trials showed that selenium supplementation does not reduce the risk of cancer and may even increase it for some types, including advanced prostate cancer and skin cancer. An increased risk of diabetes has also been reported. These findings have been consistent in the most methodologically sound trials, suggesting that the early observational studies were misleading...
2017: Advances in Cancer Research
https://www.readbyqxmd.com/read/29049045/nutrition-physical-activity-and-lifestyle-factors-in-prostate-cancer-prevention
#15
Eric Ballon-Landa, J Kellogg Parsons
PURPOSE OF REVIEW: To review current evidence for prostate cancer prevention with nutrition, physical activity, and lifestyle interventions and identify future research directions. RECENT FINDINGS: Multiple preclinical and observational studies have observed that diet, exercise, and lifestyle interventions may play a role in mitigating disease progression, mortality, and overall disease burden for high-grade and fatal prostate cancer. Increased vegetable and fruit intakes, decreased red meat and saturated fat intakes, and increased exercise are potentially associated with decreased risk of incident disease and increased progression-free, prostate cancer-specific, and overall survival...
January 2018: Current Opinion in Urology
https://www.readbyqxmd.com/read/28944218/diabetes-mitigates-the-role-of-memory-complaint-in-predicting-dementia-risk-results-from-the-prevention-of-alzheimer-s-disease-with-vitamin-e-and-selenium-study
#16
X Zhang, F A Schmitt, A M Caban-Holt, X Ding, R J Kryscio, E Abner
BACKGROUND: Subjective memory complaints (SMCs) are associated with increased risk of dementia in older adults, but the role of comorbidities in modifying this risk is unknown. OBJECTIVES: To assess whether comorbidities modify estimated dementia risk based on SMCs. DESIGN: The Prevention of Alzheimer's Disease with Vitamin E and Selenium Study (PREADVISE) was designed as an ancillary study to the Selenium and Vitamin E Cancer Prevention Trial (SELECT), a randomized, multi-center prostate cancer prevention trial with sites in the Unites States, Puerto Rico, and Canada...
2017: Journal of Prevention of Alzheimer's Disease
https://www.readbyqxmd.com/read/28917711/crocodiles-and-alligators-antiamoebic-and-antitumor-compounds-of-crocodiles
#17
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 possess mechanisms to defend themselves from noxious agents as well as protecting themselves from pathogens...
December 2017: Experimental Parasitology
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
#18
RANDOMIZED CONTROLLED TRIAL
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/28767087/novel-methylselenoesters-as-antiproliferative-agents
#19
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/28754796/a-prospective-study-of-chronic-inflammation-in-benign-prostate-tissue-and-risk-of-prostate-cancer-linked-pcpt-and-select-cohorts
#20
Elizabeth A Platz, Ibrahim Kulac, John R Barber, Charles G Drake, Corinne E Joshu, William G Nelson, M Scott Lucia, Eric A Klein, Scott M Lippman, Howard L Parnes, Ian M Thompson, Phyllis J Goodman, Catherine M Tangen, Angelo M De Marzo
Background: We leveraged two trials to test the hypothesis of an inflammation-prostate cancer link prospectively in men without indication for biopsy.Methods: Prostate Cancer Prevention Trial (PCPT) participants who had an end-of-study biopsy performed per protocol that was negative for cancer and who subsequently enrolled in the Selenium and Vitamin E Cancer Prevention Trial (SELECT) were eligible. We selected all 100 cases and sampled 200 frequency-matched controls and used PCPT end-of-study biopsies as "baseline...
October 2017: Cancer Epidemiology, Biomarkers & Prevention
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