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https://www.readbyqxmd.com/read/29141151/light-responsive-nanoparticles-for-highly-efficient-cytoplasmic-delivery-of-anticancer-agents
#1
Yangyun Wang, Yibin Deng, Huanhuan Luo, Aijun Zhu, Hengte Ke, Hong Yang, Huabing Chen
Stimuli-responsive nanostructures have shown great promise for intracellular delivery of anticancer compounds. A critical challenge remains in the exploration of stimuli-responsive nanoparticles for fast cytoplasmic delivery. Herein, near-infrared (NIR) light-responsive nanoparticles were rationally designed to generate highly efficient cytoplasmic delivery of anticancer agents for synergistic thermo-chemotherapy. The drug-loaded polymeric nanoparticles of selenium-inserted copolymer (I/D-Se-NPs) were rapidly dissociated in several minutes through reactive oxygen species (ROS)-mediated selenium oxidation upon NIR light exposure, and this irreversible dissociation of I/D-Se-NPs upon such a short irradiation promoted continuous drug release...
November 15, 2017: ACS Nano
https://www.readbyqxmd.com/read/29140592/a-versatile-strategy-to-main-chain-sulfur-selenium-functionalized-polycarbonates-via-macro-ring-closure-of-diols-and-subsequent-ring-opening-polymerization
#2
Chao Wei, Yan Zhang, Bingkun Yan, Yue Xu, Zhengzhen Du, Meidong Lang
Sulfur/selenium containing cyclic carbonate monomers (MR) are designed and synthesized by enzyme catalyzed intermolecular macro-ring closure of related diols. The proposed synthetic strategy is tolerant of other functionalities such as N-substituted groups. The ring opening polymerization (ROP) of MR occurs readily as a versatile route to generate a new family of main chain sulfur/selenium substituted aliphatic polycarbonates (PR) with predictable molecular weights (MW), narrow molecular-weight distribution and controlled copolymer composition...
November 15, 2017: Chemistry: a European Journal
https://www.readbyqxmd.com/read/29138789/preferential-s-se-occupation-in-an-anisotropic-res2-1-x-se2x-monolayer-alloy
#3
Wen Wen, Junhao Lin, Kazu Suenaga, Yuzheng Guo, Yiming Zhu, Hung-Pin Hsu, Liming Xie
Band structure engineering of two-dimensional (2D) metal dichalcogenides (TMDs) is crucial for their light-matter interaction and optoelectronic applications. Alloying of different metal or chalcogen elements with different stoichiometries in TMDs provides a versatile and efficient approach for modulating the electronic structure and properties of 2D materials. In 2D alloys, quantification of spatial distribution and local coordination of atoms facilitates the establishment of the structure-property relationship at the atomic scale...
November 15, 2017: Nanoscale
https://www.readbyqxmd.com/read/29131972/efficient-adsorption-of-selenium-iv-from-water-by-hematite-modified-magnetic-nanoparticles
#4
Zhiyao Ma, Chao Shan, Jialiang Liang, Meiping Tong
Selenium (Se) could enter the environment through different anthropogenic sources, posing potential health risk. The removal of trace Se(IV) from water by hematite coated magnetic nanoparticle (MNP@hematite) under different solution conditions was investigated through batch experiments. The adsorption capacity of Se(IV) by MNP@hematite was 25.0 mg/g.100 μg/L of Se(IV) could be rapidly decreased to below 10 μg/L by 0.1 g/L of MNP@hematite in 10 min. MNP@hematite could effectively remove Se(IV) in a wide pH range from 4 to 9...
November 4, 2017: Chemosphere
https://www.readbyqxmd.com/read/29129241/zinc-and-selenium-status-in-critically-ill-patients-according-to-severity-stratification
#5
Marina Augusta Cirino Ruocco, Evelin Drociunas Pacheco Cechinatti, Fernando Barbosa, Anderson Marliere Navarro
OBJECTIVE: The aim of this study was to evaluate the concentrations of zinc and selenium in different biological materials and to associate them with the clinical severity score according to the Simplified Acute Physiology Score (SAPS) III. METHODS: The study was conducted in a 10-bed general intensive care unit of the Américo Brasiliense State Hospital/SP, with 95 patients stratified by the SAPS III score cutoff points (63.5 points) as less or more severe and by the diagnosis of sepsis...
January 2018: Nutrition
https://www.readbyqxmd.com/read/29129231/the-association-between-the-index-of-nutritional-quality-inq-and-breast-cancer-and-the-evaluation-of-nutrient-intake-of-breast-cancer-patients-a-case-control-study
#6
Farhad Vahid, Mahshid Hatami, Mahya Sadeghi, Fatemeh Ameri, Zeinab Faghfoori, Sayed Hossein Davoodi
OBJECTIVE: Breast cancer (BrCa) is the most frequently diagnosed cancer among females and second cancer after lung cancer in many societies. In Iran, the risk for BrCa is 1 in 35 and each year, 8000 new patients have been diagnosed with BrCa. Studies have shown that dietary components are implicated in the etiology of BrCa. The Index of Nutritional Quality (INQ) is a method of quantitative and qualitative analysis of single foods, meals, and diets. The aim of this study was to determine the usefulness of INQs in predicting BrCa risk...
January 2018: Nutrition
https://www.readbyqxmd.com/read/29128604/influence-of-maternal-age-on-the-effects-of-seleno-l-methionine-in-the-model-organism-daphnia-pulex-under-standard-and-heat-stress-conditions
#7
Jordan R Nelson, Tonia S Schwartz, Julia M Gohlke
Selenium deficiency and toxicity increase the risk of adverse developmental and reproductive outcomes; however, few multi-stressor studies have evaluated the influence of maternal age on organic selenium dose-response and additional stressors over the life course. While multi-stressor research in mammalian models is time-consuming and expensive, use of alternative models can efficiently produce screening data for prioritizing research in mammalian systems. As a well-known eco-toxicological model, Daphnia pulex, may offer advantages in screening for impacts of multi-stressor exposures...
November 8, 2017: Reproductive Toxicology
https://www.readbyqxmd.com/read/29127744/-endocrine-orbitopathy-the-present-view-of-a-clinical-endocrinologist
#8
Jan Jiskra
Graves orbitopathy (GO) occurs in 25-50 % cases of Graves disease. Only in 5 % of patients the eye threatening GO is present. About 5-10 % and 10 % cases are present in euthyroid and hypothyroid patients respectively. All patients with GO should be assessed for activity (clinical activity score - CAS) and severity of the disease. Basic preconditions of the treatment are maintenance of euthyroidism, an effort to stop smoking, and referring of patients with moderate to severe and sight threatening GO to specialized thyroid eye centers...
2017: Vnitr̆ní Lékar̆ství
https://www.readbyqxmd.com/read/29126060/selenium-treatment-differentially-affects-sulfur-metabolism-in-high-and-low-glucosinolate-producing-cultivars-of-broccoli-brassica-oleracea-l
#9
Marian J McKenzie, Ronan K Y Chen, Susanna Leung, Srishti Joshi, Paula E Rippon, Nigel I Joyce, Michael T McManus
The effect of selenium (Se) application on the sulfur (S)-rich glucosinolate (GSL)-containing plant, broccoli (Brassica oleracea L. var. italica) was examined with a view to producing germplasm with increased Se and GSL content for human health, and to understanding the influence of Se on the regulation of GSL production. Two cultivars differing in GSL content were compared. Increased Se application resulted in an increase in Se uptake in planta, but no significant change in total S or total GSL content in either cultivar...
October 31, 2017: Plant Physiology and Biochemistry: PPB
https://www.readbyqxmd.com/read/29125948/effects-of-cytotoxic-cis-and-trans-diammine-monochlorido-platinum-ii-complexes-on-selenium-dependent-redox-enzymes-and-dna
#10
Heidi Lemmerhirt, Steven Behnisch, Anja Bodtke, Christopher H Lillig, Lucia Pazderova, Jana Kasparkova, Viktor Brabec, Patrick J Bednarski
Here we present the preparation of 14 pairs of cis- and trans-diammine monochlorido platinum(II) complexes, coordinated to heterocycles (i.e., imidazole, 2-methylimidazole and pyrazole) and linked to various acylhydrazones, which were designed as potential inhibitors of the selenium-dependent enzymes glutathione peroxidase 1 (GPx-1) and thioredoxin reductase 1 (TrxR-1). However, no inhibition of bovine GPx-1 and only weak inhibition of murine TrxR-1 was observed in in vitro assays. Nonetheless, the cis configured diammine monochlorido Pt(II) complexes exhibited cytotoxic and apoptotic properties on various human cancer cell lines, whereas the trans configured complexes generally showed weaker potency with a few exceptions...
October 26, 2017: Journal of Inorganic Biochemistry
https://www.readbyqxmd.com/read/29125237/toenail-mineral-concentration-and-risk-of-esophageal-squamous-cell-carcinoma-results-from-the-golestan-cohort-study
#11
Maryam Hashemian, Gwen Murphy, Arash Etemadi, Hossein Poustchi, John D Brockman, Farin Kamangar, Akram Pourshams, Masoud Khoshnia, Abdolsamad Gharavi, Sanford M Dawsey, Paul J Brennan, Paolo Boffetta, Azita Hekmatdoost, Reza Malekzadeh, Christian C Abnet
Studies conducted in China linked selenium deficiency to higher risk of esophageal squamous cell carcinoma (ESCC), but this has not been widely tested outside that selenium-deficient region. The aim of this study was to investigate the association between selenium and other mineral concentrations in toenails and risk of ESCC in a region with high incidence rates. In this nested case-control study, we identified 222 cases of ESCC from the Golestan Cohort Study, Iran, which has followed up 50,045 participants since enrollment (2004-2008)...
November 10, 2017: Cancer Medicine
https://www.readbyqxmd.com/read/29124976/rethinking-mercury-the-role-of-selenium-in-the-pathophysiology-of-mercury-toxicity
#12
Henry A Spiller
INTRODUCTION: There is increasing evidence that the pathophysiological target of mercury is in fact selenium, rather than the covalent binding of mercury to sulfur in the body's ubiquitous sulfhydryl groups. The role of selenium in mercury poisoning is multifaceted, bidirectional, and central to understanding the target organ toxicity of mercury. METHODS: An initial search was performed using Medline/PubMed, Toxline, Google Scholar, and Google for published work on mercury and selenium...
November 10, 2017: Clinical Toxicology
https://www.readbyqxmd.com/read/29124492/biogenesis-of-selenium-nanoparticles-using-green-chemistry
#13
REVIEW
Sara Shoeibi, Paul Mozdziak, Afsaneh Golkar-Narenji
Selenium binds some enzymes such as glutathione peroxidase and thioredoxin reductase, which may be activated in biological infections and oxidative stress. Chemical and physical methods for synthesizing nanoparticles, apart from being expensive, have their own particular risks. However, nanoparticle synthesis through green chemistry is a safe procedure that different biological sources such as bacteria, fungi, yeasts, algae and plants can be the catalyst bed for processing. Synthesis of selenium nanoparticles (SeNPs) by macro/microorganisms causes variation in morphology and shape of the particles is due to diversity of reduction enzymes in organisms...
November 9, 2017: Topics in Current Chemistry (Journal)
https://www.readbyqxmd.com/read/29123680/hit-detection-in-serial-femtosecond-crystallography-using-x-ray-spectroscopy-of-plasma-emission
#14
H Olof Jönsson, Carl Caleman, Jakob Andreasson, Nicuşor Tîmneanu
Serial femtosecond crystallography is an emerging and promising method for determining protein structures, making use of the ultrafast and bright X-ray pulses from X-ray free-electron lasers. The upcoming X-ray laser sources will produce well above 1000 pulses per second and will pose a new challenge: how to quickly determine successful crystal hits and avoid a high-rate data deluge. Proposed here is a hit-finding scheme based on detecting photons from plasma emission after the sample has been intercepted by the X-ray laser...
November 1, 2017: IUCrJ
https://www.readbyqxmd.com/read/29123393/antioxidant-and-hepatoprotective-role-of-selenium-against-silver-nanoparticles
#15
Sabah Ansar, Saad M Alshehri, Manal Abudawood, Sherifa S Hamed, Tansir Ahamad
Silver nanoparticles (AgNPs) have attracted the most interest in terms of their potential biomedical and industrial applications. However, these nanoparticles have shown their toxic behavior toward environment, living tissues, and organisms. Selenium (Se), an essential trace element, is necessary for various metabolic processes, including protection against oxidative stress and immune function. The present study was undertaken to evaluate the effect of Se against AgNP-induced hepatic oxidative stress. AgNPs were synthesized and then prepared nanoparticles were characterized using various analytical techniques such as UV-visible spectroscopy, X-ray diffraction, and transmission electron microscopy...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/29122967/hepatic-accumulation-of-s-adenosylmethionine-in-hamsters-with-non-alcoholic-fatty-liver-disease-associated-to-metabolic-syndrome-under-selenium-and-vitamin-e-deficiency
#16
Josep M Del Bas, Benjamín Rodríguez, Francesc Puiggròs, Silvia Mariné, Miguel Angel Rodríguez, David Moriña, Lluís Armengol, Antoni Caimari, Lluís Arola
Progression of non-alcoholic fatty liver disease (NAFLD) in the context of metabolic syndrome (MetS) is only partially explored due to the lack of preclinical models. In order to study the alterations in hepatic metabolism that accompany this condition, we developed a model of MetS accompanied by the onset of steatohepatitis (NASH) by challenging golden hamsters with a high fat diet low in vitamin E and selenium (HFD), since combined deficiency results in hepatic necroinflammation in rodents. Metabolomics and transcriptomics integrated analyses of livers revealed an unexpected accumulation of hepatic S-Adenosylmethionine (SAM) when compared with healthy livers likely due to diminished methylation reactions and repression of GNMT...
November 9, 2017: Clinical Science (1979-)
https://www.readbyqxmd.com/read/29121602/environmental-exposure-to-metals-and-the-risk-of-hypertension-a-cross-sectional-study-in-china
#17
Weixiang Wu, Shunli Jiang, Qiang Zhao, Ke Zhang, Xiaoyun Wei, Tong Zhou, Dayang Liu, Hao Zhou, Qiang Zeng, Liming Cheng, Xiaoping Miao, Qing Lu
Metal pollution is a severe environmental issue in China, which has been recently linked with the risk of hypertension. However, relevant epidemiological studies are limited. The present exploratory study was conducted to assess the associations of environmental exposure to metals with the odds of hypertension as well as blood pressure (BP) levels using urine samples in a Chinese general population. From May 2016 to April 2017, a total of 823 eligible participants were consecutively enrolled in our study in Wuhan, China...
November 6, 2017: Environmental Pollution
https://www.readbyqxmd.com/read/29121079/challenges-and-opportunities-for-moringa-growers-in-southern-ethiopia-and-kenya
#18
Diriba B Kumssa, Edward J M Joy, Scott D Young, David W Odee, E Louise Ander, Charles Magare, James Gitu, Martin R Broadley
Moringa oleifera (MO) and M. stenopetala (MS) are two commonly cultivated species of the Moringaceae family. Some households in southern Ethiopia (S. ETH) and Kenya (KEN) plant MS and MO, respectively. The edible parts of these species are rich in amino acids, vitamins and minerals, especially selenium. Despite their nutritional value, Moringa is sometimes considered as a "famine food". The aim of this study was to determine the extent of dietary utilization of these plants by Moringa Growing Households (MGHs)...
2017: PloS One
https://www.readbyqxmd.com/read/29120131/in-vitro-effects-of-selenium-on-human-glioblastoma-multiforme-cell-lines-a-preliminary-study
#19
(no author information available yet)
Glioblastoma multiforme (GBM) is caused by the central nervous system-derived glial cells, and represents the most common (50%-60%) form of primary brain tumors. The aim of this study was to investigate the in vitro effects of selenium on human GBM cells. In the present study, GMS-10 and DBTRG-05MG human GBM cell lines were used as a model to examine selenium entering the cell, cell proliferation, cytotoxicity, DNA fragmentation and Ki-67 protein expression in selenomethionine treated and non-treated groups...
March 2017: Acta Clinica Croatica
https://www.readbyqxmd.com/read/29119175/protective-effect-of-selenium-supplementation-following-oxidative-stress-mediated-by-glucose-on-retinal-pigment-epithelium
#20
Raquel González de Vega, Montserrat García, María Luisa Fernández-Sánchez, Héctor González-Iglesias, Alfredo Sanz-Medel
There are many conditions that affect the retina. However, diabetic retinopathy (RD) as a complication of Diabetes Mellitus continues to be the leading cause of blindness in working people globally. Diabetic retinopathy is an ocular complication of diabetes that is caused by the deterioration of the blood vessels that supply the retina, which has the consequence that the vision deteriorates irreversibly. The retina, and specifically the retinal pigment epithelium (RPE) is the only neural tissue that is exposed directly and frequently to light, which favors the oxidation of lipids that become extremely toxic to the cells of the retina...
November 9, 2017: Metallomics: Integrated Biometal Science
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