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Selenium and cancer

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https://www.readbyqxmd.com/read/28499854/curcumin-loading-potentiates-the-chemotherapeutic-efficacy-of-selenium-nanoparticles-in-hct116-cells-and-ehrlich-s-ascites-carcinoma-bearing-mice
#1
Manisha Kumari, L Ray, M P Purohit, S Patnaik, A B Pant, Y Shukla, P Kumar, K C Gupta
The anticancer properties of selenium (Se) and curcumin nanoparticles in solo formulations as well as in combination with other therapeutic agents have been proved time and again. Exploiting this facet of the two, we clubbed their tumoricidal characteristics and designed curcumin loaded Se nanoparticles (Se-CurNPs) to achieve an enhanced therapeutic effect. We evaluated their therapeutic effects on different cancer cell lines and Ehrlich's ascites carcinoma mouse model. In vitro results showed that Se-CurNPs were most effective on colorectal carcinoma cells (HCT116) compared to the other cancer cell lines used and possessed pleiotropic anticancer effects...
May 9, 2017: European Journal of Pharmaceutics and Biopharmaceutics
https://www.readbyqxmd.com/read/28495429/superoxide-hydrogen-peroxide-genetic-imbalance-modulates-differentially-the-oxidative-metabolism-on-human-peripheral-blood-mononuclear-cells-exposed-to-seleno-l-methionine
#2
Karen Lilian Schott, Charles Elias Assmann, Fernanda Barbisan, Verônica Farina Azzolin, Beatriz Bonadiman, Marta Maria Medeiros Frescura Duarte, Alencar Kolinski Machado, Ivana Beatrice Mânica da Cruz
Superoxide-hydrogen peroxide (S-HP) imbalance genetically caused by a gene polymorphism in the human manganese superoxide dismutase enzyme (Val16Ala-MnSOD) is associated with several dysfunctions and diseases. Into mitochondria, MnSOD catalyses superoxide radical producing hydrogen peroxide and oxygen. Ala-MnSOD genotype presents a high MnSOD efficiency and generates the highest H2O2 concentrations that has been associated with the risk of several cancer types. Cellular selenoenzymes glutathione peroxidase and thioredoxin reductase (TrxR) as well as catalase (CAT) are essential to H2O2 removal produced in excess in cells...
May 8, 2017: Chemico-biological Interactions
https://www.readbyqxmd.com/read/28460158/designing-core-shell-gold-and-selenium-nanocomposites-for-cancer-radiochemotherapy
#3
Yanzhou Chang, Lizhen He, Zhibin Li, Lilan Zeng, Zhenhuan Song, Penghui Li, Leung Chan, Yuanyuan You, Xue-Feng Yu, Paul K Chu, Tianfeng Chen
Radiotherapy is an important regime for treating malignant tumors. There is interest in the development of radiosensitizers to increase the local treatment efficacy under a relatively low and safe radiation dose. In this study, we designed Au@Se-R/A nanocomposites (Au@Se-R/A NCs) as nano-radiosensitizer to realize synergistic radiochemotherapy based on the radiotherapy sensitization property of Au nanorods (NRs) and antitumor activity of Se NPs. In vitro studies show that the combined treatment of A375 melanoma cells in culture with NCs and X-ray induces cell apoptosis through alteration in expression of p53 and DNA-damaging genes and triggers intracellular ROS overproduction, leading to greatly enhanced anticancer efficacy...
May 9, 2017: ACS Nano
https://www.readbyqxmd.com/read/28454412/comparison-of-the-seleno-transcriptome-expression-between-human-non-cancerous-mammary-epithelial-cells-and-two-human-breast-cancer-cell-lines
#4
Fabiola Rusolo, Francesca Capone, Raffaella Pasquale, Antonella Angiolillo, Giovanni Colonna, Giuseppe Castello, Maria Costantini, Susan Costantini
Breast cancer is the second most common cause of mortality in women; therefore, the identification of novel putative markers is required to improve its diagnosis and prognosis. Selenium is known to protect mammary epithelial cells from oxidative DNA damage, and to inhibit the initiation phase of carcinogenesis by stimulating DNA repair and apoptosis regulation. Consequently, the present study has focused attention on the selenoprotein family and their involvement in breast cancer. The present study performed a global analysis of the seleno-transcriptome expression in human breast cancer MCF-7 and MDA-MB231 cell lines compared with healthy breast MCF-10A cells using reverse transcription-quantitative polymerase chain reaction...
April 2017: Oncology Letters
https://www.readbyqxmd.com/read/28440710/selenium-nanoparticles-potential-in-cancer-gene-and-drug-delivery
#5
Fiona Maiyo, Moganavelli Singh
In recent decades, colloidal selenium nanoparticles have emerged as exceptional selenium species with reported chemopreventative and therapeutic properties. This has sparked widespread interest in their use as a carrier of therapeutic agents with results displaying synergistic effects of selenium with its therapeutic cargo and improved anticancer activity. Functionalization remains a critical step in selenium nanoparticles' development for application in gene or drug delivery. In this review, we highlight recent developments in the synthesis and functionalization strategies of selenium nanoparticles used in cancer drug and gene delivery systems...
May 2017: Nanomedicine
https://www.readbyqxmd.com/read/28415859/the-missing-link-the-potential-role-of-selenium-in-the-development-of-liver-cancer-and-significance-for-the-general-population
#6
Lutz Schomburg, David J Hughes
No abstract text is available yet for this article.
April 18, 2017: Expert Review of Gastroenterology & Hepatology
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
#7
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...
March 15, 2017: Oncotarget
https://www.readbyqxmd.com/read/28412747/selenomethionine-and-methyl-selenocysteine-multiple-dose-pharmacokinetics-in-selenium-replete-men
#8
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/28362118/dietary-antioxidants-potential-anticancer-agents
#9
Xiayu Wu, Jiaoni Cheng, Xu Wang
There are several extrinsic and intrinsic factors involving reactive oxygen species that play critical roles in tumor development and progression by inducing DNA mutations, genomic instability, and aberrant pro-tumorigenic signaling. There are various essential micronutrients including minerals and vitamins in the diet, which play pivotal roles in maintaining and reinforcing antioxidant performance, affecting the complex network of genes (nutrigenomic approach) and encoding proteins for carcinogenesis. A lot of these antioxidant agents are available as dietary supplements and are predominant worldwide...
May 2017: Nutrition and Cancer
https://www.readbyqxmd.com/read/28339083/health-risk-assessment-of-environmental-selenium-emerging-evidence-and-challenges-review
#10
Marco Vinceti, Tommaso Filippini, Silvia Cilloni, Annalisa Bargellini, Anna Valeria Vergoni, Aristides Tsatsakis, Margherita Ferrante
New data have been accumulated in the scientific literature in recent years which allow a more adequate risk assessment of selenium with reference to human health. This new evidence comes from environmental studies, carried out in populations characterized by abnormally high or low selenium intakes, and from high-quality and large randomized controlled trials with selenium recently carried out in the US and in other countries. These trials have consistently shown no beneficial effect on cancer and cardiovascular risk, and have yielded indications of unexpected toxic effects of selenium exposure...
May 2017: Molecular Medicine Reports
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
#11
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/28315910/effect-of-selenium-supplementation-for-protection-of-salivary-glands-from-iodine-131-radiation-damage-in-patients-with-differentiated-thyroid-cancer
#12
Haiyoung Son, Sang Mi Lee, Ra Gyoung Yoon, Hakmin Lee, Ilkyun Lee, Soon Kim, Woong Youn Chung, Jeong Won Lee
OBJECTIVE: In the current study, we examined whether selenium supplementation during iodine-131 ((131)I) treatment had a radio-protective effect on salivary glands. SUBJECTS AND METHODS: Sixteen patients with differentiated thyroid cancer were prospectively enrolled in the study. Patients after total thyroidectomy, before (131)I treatment, were divided into two groups; 8 patients in the selenium group and 8 patients in the control group. Patients in the selenium group received 300νg of selenium orally for 10 days, from 3 days before to 6 days after (131)I treatment...
January 2017: Hellenic Journal of Nuclear Medicine
https://www.readbyqxmd.com/read/28283461/induction-of-mitochondrial-dependent-apoptosis-in-t24-cells-by-a-selenium-se-containing-polysaccharide-from-ginkgo-biloba-l-leaves
#13
Dong Chen, Shaopeng Sun, Dawei Cai, Guangqi Kong
In the present study, a selenium (Se)-containing polysaccharide (Se-GBLP) was isolated and purified from the leaves of Ginkgo biloba L. Se-GBLP was further evaluated for its antitumor activity against human bladder cancer T24 cells together with the possible mechanism of action. Our results showed that treatment of T24 cells with Se-GBLP (50, 100 and 200μg/ml) for 48h significantly inhibited cell viability and induced apoptosis in a dose- dependent manner. This Se-GBLP-induced apoptosis is associated with an increased protein expression of pro-apoptotic Bax, decreased expression of anti-apoptotic Bcl-2, loss of mitochondrial membrane potential, and cleavage of caspase-9, caspase-3 and PARP, suggesting that Se-GBLP-induced apoptosis occurs through the mitochondria-dependent pathway...
March 7, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28267598/redox-responsive-mesoporous-selenium-delivery-of-doxorubicin-targets-mcf-7-cells-and-synergistically-enhances-its-anti-tumor-activity
#14
Shuang Zhao, Qianqian Yu, Jiali Pan, Yanhui Zhou, Chengwen Cao, Jian-Ming Ouyang, Jie Liu
To reduce the side effects and enhance the anti-tumor activities of anticancer drugs in the clinic, the use of nano mesoporous materials, with mesoporous silica (MSN) being the best-studied, has become an effective method of drug delivery. In this study, we successfully synthesized mesoporous selenium (MSe) nanoparticles and first introduced them to the field of drug delivery. Loading MSe with doxorubicin (DOX) is mainly driven by the physical adsorption mechanism of the mesopores, and our results demonstrated that MSe could synergistically enhance the antitumor activity of DOX...
March 4, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/28255860/serum-selenium-levels-and-cervical-cancer-systematic-review-and-meta-analysis
#15
Du He, Zaiping Wang, Chuying Huang, Xiping Fang, Dian Chen
Several studies have investigated the relationship between serum Se concentration and cervical cancer, but the results were inconsistent. Thus, we conducted a systematic review and meta-analysis to evaluate the association between serum selenium levels and cervical cancer. Twelve studies investigating the association by univariate analysis and five studies by multivariate analysis were identified after a systematic search of PubMed, Wanfang, CNKI, and SinoMed databases. Standard mean differences (SMD) or odds ratios (OR) with the corresponding 95% confidence intervals (CI) were pooled to compare the selenium levels between different groups...
March 2, 2017: Biological Trace Element Research
https://www.readbyqxmd.com/read/28202637/supplemental-selenium-may-decrease-ovarian-cancer-risk-in-african-american-women
#16
Paul D Terry, Bo Qin, Fabian Camacho, Patricia G Moorman, Anthony J Alberg, Jill S Barnholtz-Sloan, Melissa Bondy, Michele L Cote, Ellen Funkhouser, Kristin A Guertin, Edward S Peters, Ann G Schwartz, Joellen M Schildkraut, Elisa V Bandera
Background: To our knowledge, no previous study has evaluated the associations of antioxidant intake with the risk of ovarian cancer in African-American women, who are known to have high mortality from the disease.Objective: We sought to evaluate these associations among 406 ovarian cancer cases and 632 age- and site-matched controls of African-American descent recruited from AACES (African American Cancer Epidemiology Study), a population-based, case-control study in 11 geographical areas within the United States...
April 2017: Journal of Nutrition
https://www.readbyqxmd.com/read/28191840/se-ru-decorated-porous-metal-organic-framework-nanoparticles-for-the-delivery-of-pooled-sirnas-to-reversing-multidrug-resistance-in-taxol-resistant-breast-cancer-cells
#17
Qingchang Chen, Meng Xu, Wenjing Zheng, Taoyuan Xu, Hong Deng, Jie Liu
We report here a novel and personalized strategy of selenium/ruthenium nanoparticles modified metal organic frameworks MIL-101(Fe) for delivering pooled small interfering RNAs (siRNAs) to enhance therapy efficacy by silencing multidrug resistance (MDR) genes and interfere with microtubule (MT) dynamics in MCF-7/T (Taxol-resistance) cell. The existence of coordinatively unsaturated metal sites in MIL-101(Fe) can strongly interact with the electron-rich functional groups of cysteine, which can be regarded as the linkage between selenium/ruthenium nanoparticles and MIL-101(Fe)...
March 1, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28191611/vegetarianism-and-colorectal-cancer-risk-in-a-low-selenium-environment-effect-modification-by-selenium-status-a-possible-factor-contributing-to-the-null-results-in-british-vegetarians
#18
REVIEW
Jakub G Sobiecki
BACKGROUND: Despite the consistent findings of lower total cancer incidence in vegetarians than in meat-eaters in the UK, the results of studies of colorectal cancer (CRC) risk in British vegetarians have largely been null. This was in contrast to the hypothesis of a decreased risk of CRC in this population due to null intake of red and processed meats and increased intake of fibre. Although the data are inconsistent, it has been suggested that selenium (Se) status may influence CRC risk...
February 13, 2017: European Journal of Nutrition
https://www.readbyqxmd.com/read/28161410/methylseleninic-acid-and-sodium-selenite-induce-severe-er-stress-and-subsequent-apoptosis-through-upr-activation-in-pel-cells
#19
Zenpei Shigemi, Kazuki Manabe, Naoko Hara, Yusuke Baba, Kohei Hosokawa, Hiroki Kagawa, Tadashi Watanabe, Masahiro Fujimuro
Selenium compounds such as methylseleninic acid (MSA) and sodium selenite (SS) have been widely evaluated as potential anti-cancer agents in the clinical setting. Primary effusion lymphoma (PEL) is a non-Hodgkin's B-cell lymphoma, associated with immunosuppressed individuals, such as post-transplant or AIDS patients. Kaposi's sarcoma-associated herpesvirus (KSHV) is the causative agent of PEL and Kaposi's sarcoma. Here, we found that MSA and SS markedly inhibited the growth of PEL cells compared with KSHV-uninfected B cells...
March 25, 2017: Chemico-biological Interactions
https://www.readbyqxmd.com/read/28151881/serum-selenium-levels-and-prostate-cancer-risk-a-moose-compliant-meta-analysis
#20
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)
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