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https://www.readbyqxmd.com/read/29346788/vitamin-d-classic-and-novel-actions
#1
Ángel Gil, Julio Plaza-Diaz, María Dolores Mesa
BACKGROUND: Classically, vitamin D has been implicated in bone health by promoting calcium absorption in the gut and maintenance of serum calcium and phosphate concentrations, as well as by its action on bone growth and reorganization through the action of osteoblasts and osteoclasts cells. However, in the last 2 decades, novel actions of vitamin D have been discovered. The present report summarizes both classic and novel actions of vitamin D. SUMMARY: 1,25(OH)2 vitamin D, the active metabolite of vitamin D, also known as calcitriol, regulates not only calcium and phosphate homeostasis but also cell proliferation and differentiation, and has a key a role to play in the responses of the immune and nervous systems...
January 18, 2018: Annals of Nutrition & Metabolism
https://www.readbyqxmd.com/read/29346675/in-search-of-the-best-xenogeneic-material-for-a-paediatric-conduit-an-experimental-study
#2
Irina Y Zhuravleva, Nataliya R Nichay, Yuriy Y Kulyabin, Tatyana P Timchenko, Alexander A Korobeinikov, Yuliya F Polienko, Svetlana S Shatskaya, Elena V Kuznetsova, Alexey V Voitov, Alexander V Bogachev-Prokophiev, Alexander M Karaskov
OBJECTIVES: The development of calcification-resistant bioprosthetic materials is a very important challenge for paediatric surgery. The subcutaneous implantation in rats is the well-known first-stage model for this kind of research. Using this model, we aimed to compare calcification of the porcine aortic wall and bovine pericardium and jugular vein wall cross-linked with glutaraldehyde (GA) and ethylene glycol diglycidyl ether (DE). We also determined the efficacy of DE-preserved tissue modification with 2-(2-carboxyethylamino)ethylidene-1,1-bisphosphonic acid (CEABA)...
January 15, 2018: Interactive Cardiovascular and Thoracic Surgery
https://www.readbyqxmd.com/read/29342837/effect-of-exposed-surface-area-volume-and-environmental-ph-on-the-calcium-ion-release-of-three-commercially-available-tricalcium-silicate-based-dental-cements
#3
Sivaprakash Rajasekharan, Chris Vercruysse, Luc Martens, Ronald Verbeeck
Tricalcium silicate cements (TSC) are used in dental traumatology and endodontics for their bioactivity which is mostly attributed to formation of calcium hydroxide during TSC hydration and its subsequent release of calcium and hydroxide ions. The aim of this study was to determine the effect of volume (Vol), exposed surface area (ESA) and pH of surrounding medium on calcium ion release. Three commercially available hydraulic alkaline dental cements were mixed and condensed into cylindrical tubes of varying length and diameter (n = 6/group)...
January 13, 2018: Materials
https://www.readbyqxmd.com/read/29342194/tolerance-to-mild-salinity-stress-in-japonica-rice-a-genome-wide-association-mapping-study-highlights-calcium-signaling-and-metabolism-genes
#4
Julien Frouin, Antoine Languillaume, Justine Mas, Delphine Mieulet, Arnaud Boisnard, Axel Labeyrie, Mathilde Bettembourg, Charlotte Bureau, Eve Lorenzini, Muriel Portefaix, Patricia Turquay, Aurore Vernet, Christophe Périn, Nourollah Ahmadi, Brigitte Courtois
Salinity tolerance is an important quality for European rice grown in river deltas. We evaluated the salinity tolerance of a panel of 235 temperate japonica rice accessions genotyped with 30,000 SNP markers. The panel was exposed to mild salt stress (50 mM NaCl; conductivity of 6 dS m-1) at the seedling stage. Eight different root and shoot growth parameters were measured for both the control and stressed treatments. The Na+ and K+ mass fractions of the stressed plants were measured using atomic absorption spectroscopy...
2018: PloS One
https://www.readbyqxmd.com/read/29335064/real-time-assessment-of-cytosolic-mitochondrial-and-nuclear-calcium-levels-change-in-rat-pheochromocytoma-cells-during-pulsed-microwave-exposure-using-a-genetically-encoded-calcium-indicator
#5
Shao Hua Hu, Hui Wang, Li Lu, Hong Mei Zhou, Chang Zhen Wang, Ya Bing Gao, Ji Dong, Rui Yun Peng
Little information is available about the effects of exposure to pulsed microwaves on neuronal Ca2+ signaling under non-thermal conditions. In this study, rat pheochromocytoma (PC12) cells were exposed to pulsed microwaves for 6 min at a specific absorption rate (SAR) of 4 W/kg to assess possible real-time effects. During microwave exposure, free calcium dynamics in the cytosol, mitochondria, and nucleus of cells were monitored by time-lapse microfluorimetry using a genetically encoded calcium indicator (ratiometric-pericam, ratiometric-pericam-mt, and ratiometric-pericam-nu)...
December 2017: Biomedical and Environmental Sciences: BES
https://www.readbyqxmd.com/read/29330224/vitamin-d-ameliorates-impaired-wound-healing-in-streptozotocin-induced-diabetic-mice-by-suppressing-nf-%C3%AE%C2%BAb-mediated-inflammatory-genes-expression
#6
Yifeng Yuan, Sushant K Das, MaoQuan Li
[Background] : Diabetic wounds are characterized by delayed wound healing due to persistent inflammation and excessive production of reactive oxygen species. Vitamin D, which is well acknowledged as enhanced intestinal calcium absorption and increase in plasma calcium level, has recently been shown to display beneficial effects in various vascular diseases by promoting angiogenesis and inhibiting inflammatory responses. However the role of Vitamin Din diabetic wound healing is still unclear. [Materials and Methods] : In the present study, we investigated the role of Vitamin D in cutaneous wound healing in streptozotocin (STZ) induced diabetic mice...
January 12, 2018: Bioscience Reports
https://www.readbyqxmd.com/read/29322299/serum-parathyroid-hormone-and-25-hydroxyvitamin-d-concentrations-before-and-after-biliopancreatic-diversion
#7
Vanessa Tardio, Jean-Philippe Blais, Anne-Sophie Julien, Pierre Douville, Stefane Lebel, Laurent Biertho, Simon Marceau, Frédéric-Simon Hould, Claudia Gagnon
BACKGROUND: Biliopancreatic diversion with duodenal switch (BPD-DS) decreases vitamin D and calcium absorption, which may result in secondary hyperparathyroidism. This study aimed at evaluating the prevalence of vitamin D deficiency and secondary hyperparathyroidism before and after BPD-DS. METHODS: A retrospective analysis of patients who had undergone BPD-DS at a tertiary bariatric center between 2003 and 2010 and for whom simultaneous measurements of serum 25-hydroxyvitamin D and parathyroid hormone were available within 5 years post-op was performed...
January 10, 2018: Obesity Surgery
https://www.readbyqxmd.com/read/29317753/influences-of-mesoporous-magnesium-calcium-silicate-on-mineralization-degradability-cell-responses-curcumin-release-from-macro-mesoporous-scaffolds-of-gliadin-based-biocomposites
#8
Sicheng Wang, Zhengrong Gu, Zhiwei Wang, Xiao Chen, Liehu Cao, Liang Cai, Quan Li, Jie Wei, Jung-Woog Shin, Jiacan Su
Macro-mesoporous scaffolds based on wheat gliadin (WG)/mesoporous magnesium calcium silicate (m-MCS) biocomposites (WMC) were developed for bone tissue regeneration. The increasing amount of m-MCS significantly improved the mesoporosity and water absorption of WMC scaffolds while slightly decreased their compressive strength. With the increase of m-MCS content, the degradability of WMC scaffolds was obviously enhanced, and the decrease of pH value could be slow down after soaking in Tris-HCl solution for different time...
January 9, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29317227/prolonged-exposure-to-1-25-oh-2d3-and-high-ionized-calcium-induces-fgf-23-production-in-intestinal-epithelium-like-caco-2-monolayer-a-local-negative-feedback-for-preventing-excessive-calcium-transport
#9
Mayuree Rodrat, Kannikar Wongdee, Nattapon Panupinthu, Jirawan Thongbunchoo, Jarinthorn Teerapornpuntakit, Nateetip Krishnamra, Narattaphol Charoenphandhu
Overdose of oral calcium supplement and excessive intestinal calcium absorption can contribute pathophysiological conditions, e.g., nephrolithiasis, vascular calcification, dementia, and cardiovascular accident. Since our previous investigation has indicated that fibroblast growth factor (FGF)-23 could abolish the 1,25-dihydroxyvitamin D3 [1,25(OH)2D3]-enhanced calcium absorption, we further hypothesized that FGF-23 produced locally in the enterocytes might be part of a local negative feedback loop to regulate calcium absorption...
January 6, 2018: Archives of Biochemistry and Biophysics
https://www.readbyqxmd.com/read/29304450/evaluation-of-mercury-stabilization-mechanisms-by-sulfurized-biochars-determined-using-x-ray-absorption-spectroscopy
#10
Peng Liu, Carol J Ptacek, Krista M A Elena, David W Blowes, W Douglas Gould, Y Zou Finfrock, Alana O Wang, Richard C Landis
The application of biochar to treat mercury (Hg) in the environment is being proposed on an increasing basis due to its widespread availability and cost effectiveness. However, the efficiency of Hg removal by biochars is variable due to differences in source material composition. In this study, a series of batch tests were conducted to evaluate the effectiveness of sulfurized biochars (calcium polysulfide and a dimercapto-related compound, respectively) for Hg removal; Hg-loaded biochars were then characterized using synchrotron-based techniques...
December 24, 2017: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29290013/physicochemical-characterization-of-sterilized-muds-for-pharmaceutics-cosmetics-applications
#11
Maria D Kamitsou, Varvara Sygouni, Dimitra G Kanellopoulou, Konstantinos Gardikis, Petros G Koutsoukos
Clays and muds have been used for centuries as cosmetics or pharmaceutical products for various therapies. The suitability of muds and clays for health- and beauty-related applications depends on their physicochemical properties, mineralogical composition, particle characteristics and toxicity. In this work, the physicochemical characterization of 12 mud specimens from different natural spa resorts in Greece and one from Israel (Dead Sea) is presented. All specimens were sterilized at 121 °C for 20 min, because of their intended use...
December 30, 2017: Environmental Geochemistry and Health
https://www.readbyqxmd.com/read/29282249/phosphate-dependent-luminal-atp-metabolism-regulates-transcellular-calcium-transport-in-intestinal-epithelial-cells
#12
Atsushi Uekawa, Hitoki Yamanaka, Liesbet Lieben, Yoshifumi Kimira, Mariko Uehara, Yoko Yamamoto, Shigeaki Kato, Kosei Ito, Geert Carmeliet, Ritsuko Masuyama
Extracellular low phosphate strongly enhances intestinal calcium absorption independently of active vitamin D [1,25(OH)2D3] signaling, but the underlying mechanisms remain poorly characterized. To elucidate the phosphate-dependent regulation of calcium transport, we investigated part of the enteral environment that is involved in 1,25(OH)2D3-independent calcium absorption, which responds to dietary phosphate levels in mice that lack intestinal vitamin D receptor (Vdr) activity. Impaired calcium absorption in intestinal Vdr-null mice was improved by dietary phosphate restriction...
December 27, 2017: FASEB Journal: Official Publication of the Federation of American Societies for Experimental Biology
https://www.readbyqxmd.com/read/29280098/dual-slag-filters-for-enhanced-phosphorus-removal-from-domestic-waste-water-performance-and-mechanisms
#13
Minyu Zuo, Gunno Renman, Jon Petter Gustafsson, Wantana Klysubun
The phosphorus (P) removal of five combinations of dual filters consisting of blast furnace slag (BFS), argon oxygen decarburisation slag (AOD) and electric arc furnace slag (EAF) was evaluated in column experiments with domestic waste water. The columns were fed with waste water for 24 days. The column with only EAF had the best P removal performance (above 93% throughout the experiment). The speciation of the bound P was evaluated by P K-edge X-ray absorption near-edge structure (XANES) spectroscopy. In all five columns, the main P species of the slag packed in the outlet chamber was amorphous calcium phosphate (ACP)...
December 26, 2017: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29278531/nutritional-implications-of-dietary-interventions-for-managing-gastrointestinal-disorders
#14
Heidi M Staudacher, Matthew Kurien, Kevin Whelan
PURPOSE OF REVIEW: The aim of this review is to summarize some of the key dietary interventions recommended for common gastrointestinal disorders and to discuss recent evidence regarding their nutritional implications. RECENT FINDINGS: The gluten-free diet has been shown to negatively influence overall diet quality. The gluten-free diet is essential in celiac disease, although it is increasingly used for other perceived health benefits for which an analysis of perceived benefit should be weighed against any nutritional risks...
December 22, 2017: Current Opinion in Gastroenterology
https://www.readbyqxmd.com/read/29277683/new-aerosol-formulation-to-control-ciprofloxacin-pulmonary-concentration
#15
Barbara Lamy, Frederic Tewes, Dolores Remedios Serrano, Isabelle Lamarche, Patrice Gobin, William Couet, Anne Marie Healy, Sandrine Marchand
Ciprofloxacin (CIP) apparent permeability across a pulmonary epithelium model can be controlled by the affinity of its complex with a metal cation. The higher the complex affinity, the larger is the reduction in CIP apparent permeability. The aim of this study was to evaluate if the control of the CIP apparent permeability observed in vitro could be transposed in vivo to control the CIP lung-to-blood absorption rate and CIP concentrations in the lung epithelial lining fluid (ELF) after intratracheal (IT) administration...
December 22, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/29277073/investigations-on-the-spectroscopic-properties-of-dy3-ions-doped-zinc-calcium-tellurofluoroborate-glasses
#16
P Karthikeyan, S Arunkumar, K Annapoorani, K Marimuthu
A new series of Dy3+ doped (30-x)B2O3+30TeO2+20CaCO3+10ZnO+10ZnF2+xDy2O3 (x=0.01, 0.1, 0.5, 1, 2 and 3 in wt%) Zinc calcium tellurofluoroborate glasses were prepared and their structural, luminescence and excited state dynamics have been studied and reported. The structural properties have been characterized through XRD and FTIR studies to confirm the amorphous nature and to explore the presence of fundamental stretching vibrations. The bonding parameters (δ and β), optical band gap, Urbach's energy, oscillator strengths and Judd-Ofelt (JO) intensity parameters were calculated from the absorption spectra...
December 18, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29273827/stimulation-of-intestinal-calcium-absorption-by-orally-administrated-vitamin-d3-compounds-a-prospective-open-label-randomized-trial-in-osteoporosis
#17
K Uenishi, M Tokiwa, S Kato, M Shiraki
Intestinal fractional calcium absorption (FCA) was assessed before and after vitamin D3 treatment. Serum 1,25(OH)2D concentration was significantly increased by plain vitamin D3 and reduced by eldecalcitol. The 1α hydroxyl calcidiol and eldecalcitol treatments increased FCA, which may be induced through direct stimulation of vitamin D receptors in the intestine. INTRODUCTION: To assess the effects of vitamin D3 compounds on intestinal FCA and calcium-regulating hormones in post-menopausal osteoporosis, a randomized open-label prospective study was conducted...
December 23, 2017: Osteoporosis International
https://www.readbyqxmd.com/read/29258769/calcium-and-vitamin-d-in-human-health-hype-or-real
#18
REVIEW
Sunil J Wimalawansa, DSc Mohammed S Razzaque, Nasser M Al-Daghri
The incidence and the prevalence of vitamin D deficiency are increasing worldwide. It is estimated that over 50% of population in the world have low in vitamin D (i.e., hypovitaminosis D; levels below 30 ng/mL). 80% of our vitamin D requirement comes from the ultraviolet rays from sunlight, and for the remainder, we rely from the diet and supplements. The latter become important when one is exposing to less than optimal amounts of sunlight, inability of the skin to generate vitamin D efficiently, and/or having secondary causes that leads to increase catabolism of vitamin D...
December 16, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/29247917/evaluation-of-teo2-content-on-the-optical-and-spectroscopic-properties-of-yb3-doped-calcium-borotellurite-glasses
#19
A M O Lima, J F Gomes, F L Hegeto, A N Medina, A Steimacher, M J Barboza
This paper reports the synthesis and the characterization of Yb3+-doped calcium borotellurite (CaBTeX) glasses with composition 10CaF2-(29.5-0.4x)CaO-(60-0.6x)B2O3-xTeO2-0.5Yb2O3 (x=10, 16, 22, 31 and 54mol%). The results of XRD confirm the amorphous character of all the samples. The density, molar volume, refractive index and electronic polarizability values show an increase with TeO2 content. Otherwise, the optical band gap energy shows a decrease with the increase of TeO2 content. The replacement of CaO and B2O3 by TeO2 changes the glass structure, which decreases the excited Yb3+/cm3 and, consequently, the luminescence intensity...
December 8, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29244971/developing-antimicrobial-calcium-alginate-fibres-from-neem-and-papaya-leaves-extract
#20
F Hussain, M F Khurshid, R Masood, W Ibrahim
OBJECTIVE: The aim of this study was to evaluate an alternative approach to developing antimicrobial alginate fibres using plant extracts, such as those from neem and papaya leaves. METHOD: Aqueous leaves extract from neem, papaya and their hybrid combinations were used as solvent to develop sodium alginate fibres. Sodium alginate polymer containing these extracts was extruded in a calcium chloride (CaCl2) bath to develop neem (NE), papaya (PE) and their hybrid combinations-based calcium alginate fibres (H-1 to H-5)...
December 2, 2017: Journal of Wound Care
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