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prostate cancer selenium

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https://www.readbyqxmd.com/read/29176677/organoids-model-distinct-vitamin-e-effects-at-different-stages-of-prostate-cancer-evolution
#1
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
#2
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
#3
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
#4
Eric Ballon-Landa, John 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...
October 18, 2017: 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
#5
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
#6
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/28899491/association-between-selenium-and-lycopene-supplementation-and-incidence-of-prostate-cancer-results-from-the-post-hoc-analysis-of-the-procomb-trial
#7
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
#8
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
#9
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
https://www.readbyqxmd.com/read/28672782/vitamin-e-and-alzheimer-s-disease-is-it-time-for-personalized-medicine
#10
REVIEW
Breana Cervantes, Lynn M Ulatowski
For the last two decades, it has been hotly debated whether vitamin E-the major lipid-soluble antioxidant, which functions to maintain neurological integrity-is efficacious as a therapy for Alzheimer's disease. Several factors key to the debate, include (1) which of the eight naturally-occurring vitamin E forms should be used; (2) how combination treatments affect vitamin E efficacy; and (3) safety concerns that most-recently resurfaced after the results of the Selenium and vitamin E Cancer prevention trial SELECT prostate cancer trial...
June 24, 2017: Antioxidants (Basel, Switzerland)
https://www.readbyqxmd.com/read/28634111/levels-of-plasma-selenium-and-urinary-total-arsenic-interact-to-affect-the-risk-for-prostate-cancer
#11
Yu-Mei Hsueh, Chien-Tien Su, Horng-Sheng Shiue, Wei-Jen Chen, Yeong-Shiau Pu, Ying-Chin Lin, Cheng-Shiuan Tsai, Chao-Yuan Huang
This study investigated whether plasma selenium levels modified the risk for prostate cancer (PC) related to arsenic exposure. We conducted a case-control study that included 318 PC patients and 318 age-matched, healthy control subjects. Urinary arsenic profiles were examined using HPLC-HG-AAS and plasma selenium levels were measured by ICP-MS. We found that plasma selenium levels displayed a significant dose-dependent inverse association with PC. The odds ratio (OR) and 95% confidence interval (CI) for PC was 0...
September 2017: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/28592284/biogenic-selenium-nanoparticles-induce-ros-mediated-necroptosis-in-pc-3-cancer-cells-through-tnf-activation
#12
Praveen Sonkusre, Swaranjit Singh Cameotra
BACKGROUND: Selenium is well documented to inhibit cancer at higher doses; however, the mechanism behind this inhibition varies widely depending on the cell type and selenium species. Previously, we have demonstrated that Bacillus licheniformis JS2 derived biogenic selenium nanoparticles (SeNPs) induce non-apoptotic cell death in prostate adenocarcinoma cell line, PC-3, at a minimal concentration of 2 µg Se/ml, without causing toxicity to the primary cells. However, the mechanism behind its anticancer activity was elusive...
June 7, 2017: Journal of Nanobiotechnology
https://www.readbyqxmd.com/read/28415774/chemoprevention-of-prostate-cancer-in-men-with-high-grade-prostatic-intraepithelial-neoplasia-hgpin-a-systematic-review-and-adjusted-indirect-treatment-comparison
#13
Kang Cui, Xiangnan Li, Yabing Du, Xiance Tang, Seiji Arai, Yiwei Geng, Ying Xi, Han Xu, Yue Zhou, Wang Ma, Tengfei Zhang
BACKGROUND: High-grade prostatic intraepithelial neoplasia (HGPIN) is the precursor or premalignant form of prostate cancer. At least 30% patients with a confirmed HGPIN will develop prostate cancer within 1 year after repeated biopsy. HGPIN patients are the appropriate at-risk population for chemoprevention strategies investigation against prostate cancer. However the commonly used chemoprevention agents that targeted on hormonal imbalance or lifestyle-related factors showed varied results in HGPIN patients...
May 30, 2017: Oncotarget
https://www.readbyqxmd.com/read/28412747/selenomethionine-and-methyl-selenocysteine-multiple-dose-pharmacokinetics-in-selenium-replete-men
#14
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/28319243/association-of-antioxidant-supplement-use-and-dementia-in-the-prevention-of-alzheimer-s-disease-by-vitamin-e-and-selenium-trial-preadvise
#15
RANDOMIZED CONTROLLED TRIAL
Richard J Kryscio, Erin L Abner, Allison Caban-Holt, Mark Lovell, Phyllis Goodman, Amy K Darke, Monica Yee, John Crowley, Frederick A Schmitt
Importance: Oxidative stress is an established dementia pathway, but it is unknown if the use of antioxidant supplements can prevent dementia. Objective: To determine if antioxidant supplements (vitamin E or selenium) used alone or in combination can prevent dementia in asymptomatic older men. Design, Setting, and Participants: The Prevention of Alzheimer's Disease by Vitamin E and Selenium (PREADViSE) trial began as a double-blind randomized clinical trial in May 2002, which transformed into a cohort study from September 2009 to May 2015...
May 1, 2017: JAMA Neurology
https://www.readbyqxmd.com/read/28151881/serum-selenium-levels-and-prostate-cancer-risk-a-moose-compliant-meta-analysis
#16
Zhigang Cui, Dezhong Liu, Chun Liu, Gang Liu
Some observational studies have shown that elevated serum selenium levels are associated with reduced prostate cancer risk; however, not all published studies support these results. A literature search of PubMed, Embase, Medline, and the Cochrane Library up until September 2016 identified 17 studies suitable for further investigation. A meta-analysis was conducted on these studies to investigate the association between serum selenium levels and subsequent prostate cancer risk. Pooled odds ratios (ORs) and 95% confidence intervals (CIs) were used to evaluate the overall OR of prostate cancer for the highest versus the lowest levels of serum selenium...
February 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28102015/circulating-antioxidant-levels-and-risk-of-prostate-cancer-by-tmprss2-erg
#17
RANDOMIZED CONTROLLED TRIAL
Rebecca E Graff, Gregory Judson, Thomas U Ahearn, Michelangelo Fiorentino, Massimo Loda, Edward L Giovannucci, Lorelei A Mucci, Andreas Pettersson
BACKGROUND: Few studies have considered etiological differences across molecular subtypes of prostate cancer, despite potential to improve opportunities for precision prevention of a disease for which modifiable risk factors have remained elusive. Factors that lead to DNA double-strand breaks, such as oxidative stress, may promote the formation of the TMPRSS2:ERG gene fusion in prostate cancer. We tested the hypothesis that increasing levels of pre-diagnostic circulating antioxidants, which may reduce oxidative stress, are associated with lower risk of developing TMPRSS2:ERG positive prostate cancer...
May 2017: Prostate
https://www.readbyqxmd.com/read/28076331/a-short-term-intervention-with-selenium-affects-expression-of-genes-implicated-in-the-epithelial-to-mesenchymal-transition-in-the-prostate
#18
Dieuwertje E G Kok, Lambertus A L M Kiemeney, Gerald W Verhaegh, Jack A Schalken, Emile N J T van Lin, J P Michiel Sedelaar, J Alfred Witjes, Christina A Hulsbergen-van de Kaa, Pieter van 't Veer, Ellen Kampman, Lydia A Afman
In parallel with the inconsistency in observational studies and chemoprevention trials, the mechanisms by which selenium affects prostate cancer risk have not been elucidated. We conducted a randomized, placebo-controlled trial to examine the effects of a short-term intervention with selenium on gene expression in non-malignant prostate tissue. Twenty-three men received 300 µg selenium per day in the form of selenized yeast (n=12) or a placebo (n=11) during 5 weeks. Prostate biopsies collected from the transition zone before and after intervention were analysed for 15 participants (n=8 selenium, n=7 placebo)...
February 7, 2017: Oncotarget
https://www.readbyqxmd.com/read/27998216/biases-in-recommendations-for-and-acceptance-of-prostate-biopsy-significantly-affect-assessment-of-prostate-cancer-risk-factors-results-from-two-large-randomized-clinical-trials
#19
REVIEW
Catherine M Tangen, Phyllis J Goodman, Cathee Till, Jeannette M Schenk, M Scott Lucia, Ian M Thompson
Purpose To identify factors related to who undergoes a prostate biopsy in a screened population and to estimate the impact of biopsy verification on risk factor-prostate cancer associations. Patients and Methods Men who were screened regularly from the placebo arms of two large prostate cancer prevention trials (Prostate Cancer Prevention Trial [PCPT] and Selenium and Vitamin E Cancer Prevention Trial [SELECT]) were examined to define incident prostate cancer cohorts. Because PCPT had an end-of-study biopsy, prostate cancer cases were categorized by a preceding prostate-specific antigen/digital rectal examination prompt (yes/no) and noncases by biopsy-proven negative status (yes v no)...
December 20, 2016: Journal of Clinical Oncology: Official Journal of the American Society of Clinical Oncology
https://www.readbyqxmd.com/read/27782038/the-effect-of-zinc-and-selenium-supplementation-mode-on-their-bioavailability-in-the-rat-prostate-should-administration-be-joint-or-separate
#20
Adam Daragó, Andrzej Sapota, Marzenna Nasiadek, Michał Klimczak, Anna Kilanowicz
It is thought that zinc and selenium deficiency may play a significant role in the etiology of prostate cancer. Although joint zinc and selenium supplementation is frequently applied in the prevention of prostate diseases, the bioavailability of these elements in the prostate after co-administration is still unknown. The study examines the effect of subchronic supplementation of zinc gluconate and selenium compounds (sodium selenite or selenomethionine), administered together or separately, on their bioavailability in the prostate, as well as the induction of metallothionein-like proteins (MTs) bound to zinc in the prostate and liver...
October 4, 2016: Nutrients
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