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Vitamin d3

Adèle Coriati, Évelyne Labrèche, Marjolaine Mailhot, Hortensia Mircescu, Yves Berthiaume, Annick Lavoie, Rémi Rabasa-Lhoret
BACKGROUND & AIMS: Vitamin D (Vit D) deficiency in cystic fibrosis (CF) is partially secondary to exocrine pancreatic insufficiency. Our aim was to establish a Vit D3 supplementation protocol that will increase 25(OH)D to the recommended level (30 ng/mL). METHODS: Retrospective study of 200 patients (≥18 years) conducted from February 2007 to June 2014 at the CF clinic of the Centre Hospitalier de l'Université de Montréal. Vit D3 supplementation protocol was 1600 IU/day or 10,000 IU/week during the summer (May 1st to October 31st) and 3200 IU/day or 20,000 IU/week during the winter (November 1st to April 30th), in addition to the 1200 IU/day included in multivitamins...
October 8, 2016: Clinical Nutrition: Official Journal of the European Society of Parenteral and Enteral Nutrition
Michael G White, Marc A Ward, Megan K Applewhite, Harry Wong, Vivek Prachand, Peter Angelos, Edwin L Kaplan, Raymon H Grogan
BACKGROUND: With over 110,000 bariatric operations performed in the United States annually, it is important to understand the biochemical abnormalities causing endocrine dysfunction associated with these procedures. Here we compare 2 malabsorptive procedures, duodenal switch and Roux-en-Y gastric bypass, to determine the role malabsorption plays in secondary hyperparathyroidism in this population. METHODS: Data from all super-obese patients undergoing duodenal switch or Roux-en-Y gastric bypass between August 2002 and October 2005 were prospectively collected...
October 18, 2016: Surgery
Pang Yao, Liang Sun, Ling Lu, Hong Ding, Xiafei Chen, Lixin Tang, Xinming Xu, Gang Liu, Yao Hu, Yiwei Ma, Feijie Wang, Qianlu Jin, He Zheng, Huiyong Yin, Rong Zeng, Yan Chen, Frank B Hu, Huaixing Li, Xu Lin
CONTEXT: Little is known how genetic and non-genetic factors modify responses of vitamin D supplementation in nonwhite populations. OBJECTIVE: To investigate factors modifying 25-hydroxyvitamin D (25[OH]D) and bioavailable 25(OH)D (25[OH]DBio) responses after vitamin D3 supplementation. Design, Setting, Participants, and Intervention: In this randomized, double-blinded, placebo-controlled trial, 448 Chinese with vitamin D deficiency (25[OH]D<50 nmol/L) received 2000 IU/d vitamin D3 or placebo for 20 weeks...
October 21, 2016: Journal of Clinical Endocrinology and Metabolism
David Jarrard, Badrinath Konety, Wei Huang, Tracy Downs, Jill Kolesar, Kyung Mann Kim, Tom Havighurst, Joel Slaton, Margaret G House, Howard L Parnes, Howard H Bailey
INTRODUCTION AND OBJECTIVES: Prostate cancer (PCa) represents an important target for chemoprevention given its prolonged natural history and high prevalence. Epidemiologic and laboratory data suggest that vitamin D and genistein (soy isoflavone) may decrease PCa progression. The effect of vitamin D on prostate epithelial cell proliferation and differentiation is well documented and genistein may augment this affect through inhibition of the CYP24 enzyme, which is responsible for intracellular vitamin D metabolism...
2016: American Journal of Clinical and Experimental Urology
Fatemeh Mahmoodani, Conrad O Perera, Bruno Fedrizzi, Grant Abernethy, Hong Chen
In any food fortification program, the stability of added micronutrients is an important factor. Cholecalciferol or vitamin D3 is known to isomerise under various conditions, thereby making its analysis challenging. In the current study, the effects of different parameters, such as temperature, iodine, acidic conditions, and oxidation, on the isomerisation of vitamin D3 were studied using HPLC-DAD and UHPLC-MS/MS. Vitamin D3 thermally and reversibly transforms to pre-vitamin D3 type isomers. In the presence of iodine, cis/trans isomerisation of both cholecalciferol and pre-vitamin D3 takes place to form trans-vitamin D3 and tachysterol, respectively...
March 15, 2017: Food Chemistry
D Bogdanou, M Penna-Martinez, N Filmann, T L Chung, Y Moran-Auth, J Wehrle, C Cappel, S Huenecke, E Herrmann, U Koehl, K Badenhoop
BACKGROUND: Type 1 diabetes mellitus (T1D) is mediated by autoaggressive T effector cells with an underlying regulatory T cell (Treg) defect. Vitamin D (VD) deficiency is highly prevalent in T1D which can aggravate immune dysfunction. High dose VD treatment may enhance Tregs and improve metabolism in T1D patients. METHODS: In a randomized, double-blind, placebo-controlled trial with cross-over design, patients received either for three months cholecalciferol 4000 IU/d, followed by three months placebo or the sequential alternative...
October 20, 2016: Diabetes/metabolism Research and Reviews
F Mashayekhi, Z Salehi
In the central nervous system (CNS) the main proteins of myelin are proteolipid protein (PLP), myelin basic protein (MBP), myelin oligodendrocyte glycoprotein (MOG) and CNPase. Myelin oligodendrocyte glycoprotein is a minor component of the myelin sheath, but is an important autoantigen linked to the pathogenesis of multiple sclerosis (MS). CNPase is expressed exclusively by oligodendrocytes in the CNS, and the appearance of CNPase seems to be one of the earliest events of oligodendrocyte differentiation and myelination...
2016: Folia Neuropathologica
Xin Gu, Bingjie Gu, Xianhui Lv, Zhenzhen Yu, Rong Wang, Xiaoli Zhou, Wanxin Qiao, Zhiyuan Mao, Guoping Zuo, Qing Li, Dengshun Miao, Jianliang Jin
Impaired apoptosis of fibroblast-like synoviocytes (FLSs) causes synovial hyperplasia, facilitating destruction of cartilage and bone in rheumatoid arthritis (RA). Tumor necrosis factor (TNF)-α, a dominant inflammatory mediator in RA pathogenesis, promotes progression of RA symptoms. Prevalence of 1, 25-dihydroxy-vitamin D3 (hereafter termed VD) deficiency is 30-63% in patients with RA. Whether VD leads to apoptosis or enhances TNF-α-mediated apoptosis in FLSs to ameliorate RA is unclear. To determine this, 10-week-old CYP27B1-deficient (CYP27B1(-/-)) mice with collagen-induced arthritis (CIA) were intraperitoneally treated with 1 μg/kg VD every other day for 9 weeks...
October 20, 2016: Cell Death & Disease
E Corden, E Higgins, C Smith
A 55-year-old man with severe plaque psoriasis presented with a 2-week history of feeling generally unwell with lethargy and thirst. His symptoms had developed 6 weeks after commencement of the topical vitamin D3 analogue calcitriol. Investigations revealed hypercalcaemia and acute-on-chronic kidney injury, probably directly induced by systemic absorption of vitamin D3 following extensive topical use. Topical calcitriol had been started as a steroid-sparing agent to reduce the patient's liberal potent corticosteroid usage during anti-tumour necrosis factor-alfa therapy...
October 20, 2016: Clinical and Experimental Dermatology
Dimitrios Palaiogiannis, Evangelia Bekou, Kalliopi Pazaitou-Panayiotou, Victoria Samanidou, Andreas Tsakalof
The development and approbation of new, automated UHPLC-DAD method for the quantification of 25-hydroxyvitamin D3/D2 (25OH-D3/D2) metabolites in plasma/serum for the evaluation of patient's vitamin D status are presented. The method was developed on the Ultimate 3000 UHPLC dual gradient system supplied with the on-line SPE-concentration column coupled through six port switching valve to analytical column. This configuration and materials selected enable large volume sample injection (500μL) and on-line sample preconcentration, clean up and subsequent selective metabolites transfer onto the analytical column...
October 11, 2016: Journal of Chromatography. B, Analytical Technologies in the Biomedical and Life Sciences
Chloe A Smith, Cong Sun, Angela Pezic, Christine Rodda, Fergus Cameron, Katie Allen, Maria E Craig, John Carlin, Terry Dwyer, Robyn M Lucas, Darryl W Eyles, Andrew S Kemp, Justine A Ellis, Anne-Louise Ponsonby
BACKGROUND: Vitamin D deficiency is linked to adverse childhood health outcomes, yet data on the distribution and quantifiable determinants of neonatal 25-hydroxyvitamin D3 (25OHD) concentration, a vitamin D biomarker, are limited. OBJECTIVE: Our aim was to identify determinants of neonatal 25OHD concentration, measured using neonatal dried blood spots (DBS). METHODS: A total of 259 ethnically diverse children aged 0-16 years born in Victoria, Australia, were recruited...
October 19, 2016: Neonatology
Masaatsu Miyauchi, Hideaki Nakajima
UV radiation contains erythemally-weighted UV, as well as UV that synthesizes vitamin D3 . Here, we attempted to determine the relationship between these factors by numerical simulation of atmospheric parameters, such as total ozone, using a simplified "SMART2″ model for radiative transfer. Both forms of UV were almost linearly correlated with each other for a comparably large UV radiation exposure, larger than UV Index ~ 1.6. If erythemally-weighted UV, which carries a risk of sunburn, is known, the amount of UV exposure needed for vitamin D synthesis in the epidermis can be estimated using this relationship...
October 18, 2016: Photochemistry and Photobiology
Brajesh K Yadav, Shanker K Singh, Udayraj P Nakade, Vivek K Singh, Abhishek Sharma, Mukesh Srivastava, Brijesh Yadav, Yajuvendra Singh, Rajneesh Sirohi, Satish K Garg
Twelve apparently healthy multiparous parturient Sahiwal cows were allocated into two groups having six cows in each one. Six cows were supplemented with antioxidant mixture (mixture containing Cu, Mn, Cr, Zn, and vitamins A and D3) daily from 21 days before parturition till the day relative to calving. Whereas, remaining non-supplemented six cows were kept as the control group. Blood samples were obtained five times: at enrolment (21 days pre-partum), and again at days 0, +7, +14, and +21 relative to calving...
October 17, 2016: Biological Trace Element Research
Corwin D Nelson, John D Lippolis, Timothy A Reinhardt, Randy E Sacco, Jessi L Powell, Mary E Drewnoski, Matthew O'Neil, Donald C Beitz, William P Weiss
The need for vitamin D supplementation of dairy cattle has been known for the better part of the last century and is well appreciated by dairy producers and nutritionists. Whether current recommendations and practices for supplemental vitamin D are meeting the needs of dairy cattle, however, is not well known. The vitamin D status of animals is reliably indicated by the concentration of the 25-hydroxyvitamin D [25(OH)D] metabolite in serum or plasma, with a concentration of 30 ng/mL proposed as a lower threshold for sufficiency...
October 13, 2016: Journal of Dairy Science
Paige M Kulling, Kristine C Olson, Thomas L Olson, David J Feith, Thomas P Loughran
Commonly known for its critical role in calcium homeostasis and bone mineralization, more recently vitamin D has been implicated in haematological cancer pathogenesis and shows promise as an anti-cancer therapy. Serum levels of 25(OH)D3 , the precursor to the active form of vitamin D, calcitriol, are typically lower in patients with haematological disease compared to healthy individuals. This often correlates with worse disease outcome. Furthermore, diseased cells typically highly express the vitamin D receptor (VDR), which is required for many of the anti-cancer effects observed in multiple in vivo and in vitro cancer models...
October 15, 2016: European Journal of Haematology
Daniel J Owens, Jonathan C Y Tang, Warren J Bradley, S Andy Sparks, William D Fraser, James P Morton, Graeme L Close
PURPOSE: Supplementation with dietary forms of vitamin D is commonplace in clinical medicine, elite athletic cohorts and the general population, yet the response of all major vitamin D metabolites to high doses of vitamin D is poorly characterized. We aimed to identify the responses of all major vitamin D metabolites to moderate and high dose supplemental vitamin D3. METHODS: A repeated measures design was implemented in which 46 elite professional European athletes were block randomized based on their basal 25[OH]D concentration into two treatment groups...
October 13, 2016: Medicine and Science in Sports and Exercise
Usha Gowda, Thilanga Ruwanpathirana, David P S Fong, Ambika Kaur, Andre M N Renzaho
BACKGROUND: Higher dose of vitamin D supplementation 50000 IU is required for those whose serum 25(OH)D levels are 50 nmol/L and below. The increment in serum 25(OH)D though not significantly affected by race, sex or age it is negatively correlated to the baseline 25(OH)D concentration. This study investigated whether the mean increase in serum 25(OH)D will be higher among participants with lower baseline 25(OH)D levels and whether the duration of supplementation has an influence on the serum 25(OH)D achieved...
October 13, 2016: BMC Health Services Research
Tristan E Lipkie, Mario G Ferruzzi, Connie M Weaver
The assessment of the efficacy of dietary and supplemental vitamin D tends to be confounded by differences in the serum 25-hydroxyvitamin D response between vitamin D2 and vitamin D3. Serum response differences from these vitamers may be due to differences in bioavailability. To address this specifically, the bioaccessibility was assessed for vitamin D2 from breads fortified with UV-treated yeast, and a benchmark against staple vitamin D3 fortified foods including bovine milks and infant formula, as well as crystalline vitamin D2 fortified bread...
October 13, 2016: Food & Function
Charlotte Mortensen, Camilla T Damsgaard, Hanne Hauger, Christian Ritz, Susan A Lanham-New, Taryn J Smith, Áine Hennessy, Kirsten Dowling, Kevin D Cashman, Mairead Kiely, Christian Mølgaard
BACKGROUND: Children in northern latitudes are at high risk of vitamin D deficiency during winter because of negligible dermal vitamin D3 production. However, to our knowledge, the dietary requirement for maintaining the nutritional adequacy of vitamin D in young children has not been investigated. OBJECTIVE: We aimed to establish the distribution of vitamin D intakes required to maintain winter serum 25-hydroxyvitamin D [25(OH)D] concentrations above the proposed cutoffs (25, 30, 40, and 50 nmol/L) in white Danish children aged 4-8 y living at 55°N...
October 12, 2016: American Journal of Clinical Nutrition
Shaik Hussain, K Indira Devi
No abstract text is available yet for this article.
January 2016: Journal of the Association of Physicians of India
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