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25-hydroxyvitamin D

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https://www.readbyqxmd.com/read/28822553/vitamin-d-status-in-growing-dairy-goats-and-sheep-influence-of-ultraviolet-b-radiation-on-bone-metabolism-and-calcium-homeostasis
#1
M V Nemeth, M R Wilkens, A Liesegang
The aim of this study was to investigate how controlled UVB irradiation in combination with reduced nutritional vitamin D (vitD) supply affects vitD status and Ca metabolism of growing goats and sheep. The hypothesis was that, like dairy cows, goats and sheep are able to compensate for the missing nutritional supply of vitD through endogenous production in the skin, with the consequence of a high vitD status and a balanced Ca homeostasis. Sixteen lambs and 14 goat kids aged 3 and a half months were housed in an UVB free environment and fed hay and a vitD-free concentrate over a period of 13 wk...
August 16, 2017: Journal of Dairy Science
https://www.readbyqxmd.com/read/28822355/baseline-assessment-of-25-hydroxyvitamin-d-assay-performance-a-vitamin-d-standardization-program-vdsp-interlaboratory-comparison-study
#2
Stephen Wise, Karen Phinney, Susan Tai, Johanna Camara, Gary Myers, Ramon Durazo-Arvizu, Lu Tian, Andrew Hoofnagle, Lorin Bachmann, Ian Young, Juanita Pettit, Grahame Caldwell, Andrew Liu, Stephen Brooks, Kurtis Sarafin, Michael Thamm, Gert Mensink, Markus Busch, Martina Rabenberg, Kevin Cashman, Mairead Kiely, Michael Kinsella, Karen Galvin, Joy Zhang, Kyungwon Oh, Sun-Wha Lee, Chae Jung, Lorna Cox, Gail Goldberg, Kate Guberg, Ann Prentice, Graham Carter, Julia Jones, Patsy Brannon, Robyn Lucas, Peter Crump, Etienne Cavalier, Joyce Merkel, Joseph Betz, Christopher Sempos
The Vitamin D Standardization Program (VDSP) coordinated an interlaboratory study to assess the comparability of measurements of total 25-hydroxyvitamin D [25(OH)D] in human serum, which is the primary marker of vitamin D status. A set of 50 individual donor samples were analyzed by 15 different laboratories representing national nutrition surveys, assay manufacturers, and clinical and/or research laboratories to provide results for total 25(OH)D using both immunoassays (IAs) and LC tandem MS (MS/MS). The results were evaluated relative to bias compared with the target values assigned based on a combination of measurements at Ghent University (Belgium) and the U...
August 19, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28822308/the-acute-effects-of-ultraviolet-radiation-on-the-blood-transcriptome-are-independent-of-plasma-25ohd3
#3
Mariona Bustamante, Carles Hernandez-Ferrer, Yaris Sarria, Graham I Harrison, Lara Nonell, Wenjing Kang, Marc R Friedländer, Xavier Estivill, Juan R González, Mark Nieuwenhuijsen, Antony R Young
The molecular basis of many health outcomes attributed to solar ultraviolet radiation (UVR) is unknown. We tested the hypothesis that they may originate from transcriptional changes in blood cells. This was determined by assessing the effect of fluorescent solar simulated radiation (FSSR) on the transcriptional profile of peripheral blood pre- and 6h, 24h and 48h post-exposure in nine healthy volunteers. Expression of 20 genes was down-regulated and one was up-regulated at 6h after FSSR. All recovered to baseline expression at 24h or 48h...
August 16, 2017: Environmental Research
https://www.readbyqxmd.com/read/28822224/is-it-necessary-for-all-samples-to-quantify-25ohd2-and-25ohd3-using-lc-ms-ms-in-clinical-practice
#4
Songlin Yu, Ruiping Zhang, Weiyan Zhou, Xinqi Cheng, Qian Cheng, Liangyu Xia, Shaowei Xie, Yicong Yin, Dandan Sun, Wei Su, Ling Qiu
BACKGROUND: The demand for vitamin D testing is increasing in China. Liquid chromatography-tandem mass spectrometry (LC-MS/MS) immunoassay is specific and accurate but requires expensive equipment, experienced operators, and complicated pretreatment of serum. Automated immunoassays are simple and convenient but only determine total 25-hydroxyvitamin D (25OHD). The objective of this study was to quantify 25OHD2 and 25OHD3 in patients to assist clinical physicians and laboratory directors in choosing the most appropriate method to determine 25OHD...
August 19, 2017: Clinical Chemistry and Laboratory Medicine: CCLM
https://www.readbyqxmd.com/read/28820448/vitamin-d-status-of-residents-in-taiyuan-china-and-influencing-factors
#5
Xiaoning Yan, Jasmine S Thomson, Ruibao Zhao, Ruifang Zhu, Zhaolin Wang, Na Zhang, Jane Coad
High prevalence of vitamin D deficiency has been reported worldwide. Residents of Taiyuan, China, were predicted to be at high risk of vitamin D deficiency due to its high latitude, heavy air pollution, and cultural sun avoidance. This study investigated the vitamin D status of office workers, and explored the potential determinants of capillary 25-hydroxyvitamin D (25(OH)D) concentration as well as the relationship between 25(OH)D and metabolic syndrome. Two hundred participants, aged 20 to 80 years, were recruited...
August 18, 2017: Nutrients
https://www.readbyqxmd.com/read/28815282/correction-of-vitamin-d-status-by-calcidiol-pharmacokinetic-profile-safety-and-biochemical-effects-on-bone-and-mineral-metabolism-of-daily-and-weekly-dosage-regimens
#6
S Minisola, L Cianferotti, P Biondi, C Cipriani, C Fossi, F Franceschelli, F Giusti, G Leoncini, J Pepe, H A Bischoff-Ferrari, M L Brandi
RATIONALE: Calcidiol can be employed to correct vitamin D deficiency. MAIN RESULTS: Calcidiol administered at daily and weekly regimens over a period of 3 months was able to successfully raise 25-hydroxyvitamin D levels without altering other markers related to bone and mineral metabolism. SIGNIFICANCE: Calcidiol supplementation is effective and safe. INTRODUCTION: The correction of vitamin D status is necessary to maintain an optimal mineral and skeletal homeostasis...
August 16, 2017: Osteoporosis International
https://www.readbyqxmd.com/read/28814531/patients-with-nonalcoholic-fatty-liver-disease-have-a-low-response-rate-to-vitamin-d-supplementation
#7
Jaividhya Dasarathy, Rony Varghese, Abram Feldman, Amer Khiyami, Arthur J McCullough, Srinivasan Dasarathy
Background: Hypovitaminosis D is associated with an increased severity of nonalcoholic fatty liver disease (NAFLD), but reports on the response to cholecalciferol (vitamin D3) supplementation are conflicting.Objective: The objective of this study was to determine if standard vitamin D3 supplementation is effective in NAFLD with hypovitaminosis D.Methods: Sixty-five well-characterized adults [age (mean ± SD): 51.6 ± 12.3 y] with biopsy-proven NAFLD were screened. Forty-two patients (the ratio of men to women was 13:29) had hypovitaminosis D (plasma 25-hydroxyvitamin D [25(OH)D] <30 ng/mL)...
August 16, 2017: Journal of Nutrition
https://www.readbyqxmd.com/read/28808890/vitamin-d-activity-and-metabolism-in-bone
#8
REVIEW
Paul H Anderson
PURPOSE OF REVIEW: In addition to the actions of the endocrine hormone, 1alpha,25-dihydroxyvitamin D (1,25(OH)2D) in stimulating intestinal calcium absorption, the regulation of bone mineral metabolism by 1,25(OH)2D is also considered an important contributor to calcium homeostasis. However, recent evidence suggest that 1,25(OH)2D acting either via endocrine or autocrine pathways plays varied roles in bone, which suggests that vitamin D contributes to the maintenance of bone mineral in addition to its catabolic roles...
August 14, 2017: Current Osteoporosis Reports
https://www.readbyqxmd.com/read/28807113/circulating-vitamin-d-binding-protein-and-free-25-hydroxyvitamin-d-concentrations-in-patients-with-melanoma-a-case-control-study
#9
Cristián Navarrete-Dechent, Constanza Del Puerto, Montserrat Molgó, Sergio González, Guillermo Pérez-Mateluna, Pablo Uribe, Carlos A Camargo, Arturo Borzutzky
No abstract text is available yet for this article.
September 2017: Journal of the American Academy of Dermatology
https://www.readbyqxmd.com/read/28806419/effects-of-short-term-dry-immersion-on-bone-remodeling-markers-insulin-and-adipokines
#10
Marie-Thérèse Linossier, Liubov E Amirova, Mireille Thomas, Myriam Normand, Marie-Pierre Bareille, Guillemette Gauquelin-Koch, Arnaud Beck, Marie-Claude Costes-Salon, Christine Bonneau, Claude Gharib, Marc-Antoine Custaud, Laurence Vico
BACKGROUND: Dry immersion (DI), a ground-based model of microgravity previously used in Russia, has been recently implemented in France. The aim of this study was to analyze early events in a short-term DI model in which all conditions are met to investigate who is first challenged from osteo- or adipo-kines and to what extent they are associated to insulin-regulating hormones. METHODS: Twelve healthy men were submitted to a 3-day DI. Fasting blood was collected during pre-immersion phase for the determination of the baseline data collection (BDC), daily during DI (DI24h, DI48H and DI72h), then after recovery (R+3h and R+24h)...
2017: PloS One
https://www.readbyqxmd.com/read/28804921/serum-thymidine-kinase-1-canine-c-reactive-protein-haptoglobin-and-vitamin-d-concentrations-in-dogs-with-immune-mediated-hemolytic-anemia-thrombocytopenia-and-polyarthropathy
#11
M Grobman, H Outi, H Rindt, C Reinero
BACKGROUND: Relapses of immune-mediated hemolytic anemia (IMHA), thrombocytopenia (ITP), or polyarthropathy (IMPA) occur despite normal hematologic and cytologic parameters. Thymidine kinase 1 (TK1), canine C-reactive protein (c-CRP), haptoglobin (HPT), and 25-Hydroxyvitamin-D (25(OH)D) might be adjunct to current monitoring strategies. HYPOTHESIS/OBJECTIVES: Compare serum concentrations of TK1, c-CRP, HPT, and 25(OH)D in dogs with well- and poorly controlled primary IMHA, ITP, or IMPA...
August 14, 2017: Journal of Veterinary Internal Medicine
https://www.readbyqxmd.com/read/28803880/vitamin-d-and-symptoms-of-depression-in-overweight-or-obese-adults-a-cross-sectional-study-and-randomized-placebo-controlled-trial
#12
Aya Mousa, Negar Naderpoor, Maximilian P J de Courten, Barbora de Courten
Recent evidence suggests that vitamin D deficiency may contribute to increased risk of depression. However, previous studies are limited by variability in participant characteristics including vitamin D deficiency status and presence of existing diseases, use of low doses of vitamin D supplementation for short durations, and use of co-interventions or psychotropic drugs. We examined whether 25-hydroxyvitamin D (25(OH)D) concentrations were associated with symptoms of depression, as well as whether vitamin D supplementation reduced symptoms of depression in overweight or obese and vitamin D-deficient, but otherwise healthy adults...
August 10, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28802294/serum-25-hydroxyvitamin-d-and-elderly-skeletal-muscle-mass-and-function-in-urban-north-china
#13
Liping Meng, Qingqing Man, Linhong Yuan, Lingxia Shen, Weimin Li, Guiyuan Guo, Lixiang Li, Shanshan Jia, Yixiong Gao, Pengkun Song, Jian Zhang
BACKGROUND AND OBJECTIVES: To investigate the association of serum 25-hydroxyvitamin D (25(OH)D) with skeletal muscle mass (SMM) and function among the elderly in an urban area in northern China. METHODS AND STUDY DESIGN: A total of 912 participants (316 men, 596 women) aged more than 60 years from 4 communities in Beijing were enrolled. Serum concentrations of 25(OH)D were measured through radioimmunoassay. SMM was assessed through bioelectrical impendence analysis, whereas skeletal muscle function was assessed through grip strength and 4-m regular gait speed measurements...
2017: Asia Pacific Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/28799838/vitamin-d-receptor-gene-foki-polymorphism-in-egyptian-children-and-adolescents-with-sle-a-case-control-study
#14
A A Imam, H E Ibrahim, M A A Farghaly, U M Alkholy, H H Gawish, N Abdalmonem, A M Sherif, Y F Ali, M E Hamed, N M Waked, M M Fathy, A M Khalil, M A Noah, M S Hegab, B R Ibrahim, R M Nabil, L A Fattah
Background Childhood-onset systemic lupus erythematosus (cSLE) is a lifelong autoimmune disorder. The vitamin D receptor (VDR) gene is a potential candidate gene for cSLE susceptibility. In this study, we aimed to investigate the FokI polymorphism in the VDR gene in Egyptian children and adolescents with SLE, to determine whether this polymorphism could be a genetic marker for cSLE susceptibility or disease activity and we also measured the serum level of 25-hydroxyvitamin D [25(OH) D] to assess its relation to such polymorphism...
January 1, 2017: Lupus
https://www.readbyqxmd.com/read/28798036/why-don-t-serum-vitamin-d-concentrations-associate-with-bmd-by-dxa-a-case-of-being-bound-to-the-wrong-assay-implications-for-vitamin-d-screening
#15
Richard J Allison, Abdulaziz Farooq, Anissa Cherif, Bruce Hamilton, Graeme L Close, Mathew G Wilson
BACKGROUND: The association between bone mineral density (BMD) and serum25-hydroxyvitamin D (25(OH)D) concentration is weak, particularly in certain races (eg, BlackAfrican vs Caucasian) and in athletic populations. We aimed to examine if bioavailable vitamin D rather than serum 25(OH)D was related to markers of bone health within a racially diverse athletic population. METHODS: In 604 male athletes (Arab (n=327), Asian (n=48), Black(n=108), Caucasian (n=53)and Hispanic (n=68)), we measured total 25(OH)D, vitamin D-binding protein and BMD by DXA...
August 10, 2017: British Journal of Sports Medicine
https://www.readbyqxmd.com/read/28797319/baseline-assessment-of-25-hydroxyvitamin-d-reference-material-and-proficiency-testing-external-quality-assurance-material-commutability-a-vitamin-d-standardization-program-study
#16
Karen Phinney, Christopher Sempos, Susan Tai, Johanna Camara, Stephen Wise, John Eckfeldt, Andrew Hoofnagle, Graham Carter, Julia Jones, Gary Myers, Ramon Durazo-Arvizu, W Greg Miller, Lorin Bachmann, Ian Young, Juanita Pettit, Andrew Liu, Stephen Brooks, Kurtis Sarafin, Michael Thamm, Gert Mensink, Markus Busch, Martina Rabenberg, Kevin Cashman, Mairead Kiely, Karen Galvin, Joy Zhang, Michael Kinsella, Kyungwon Oh, Sun-Wha Lee, Chae Jung, Lorna Cox, Gail Goldberg, Kate Guberg, Sarah Meadows, Ann Prentice, Lu Tian, Patsy Brannon, Robyn Lucas, Peter Crump, Etienne Cavalier, Joyce Merkel, Joseph Betz, Grahame Caldwell
The Vitamin D Standardization Program (VDSP) coordinated a study in 2012 to assess the commutability of reference materials and proficiency testing/external quality assurance materials for total 25-hydroxyvitamin D [25(OH)D] in human serum, the primary indicator of vitamin D status. A set of 50 single-donor serum samples as well as 17 reference and proficiency testing/external quality assessment materials were analyzed by participating laboratories that used either immunoassay or LC-MS methods for total 25(OH)D...
August 10, 2017: Journal of AOAC International
https://www.readbyqxmd.com/read/28795765/vitamin-d-predictors-in-polycystic-ovary-syndrome-a-meta-analysis
#17
Flora Bacopoulou, Evangelia Kolias, Vasiliki Efthymiou, Constantine N Antonopoulos, Evangelia Charmandari
BACKGROUND: The aim of this meta-analysis was to examine differences and predictors of serum 25-hydroxyvitamin D concentrations in women with polycystic ovary syndrome (PCOS) compared with non-PCOS controls matched for body mass index. MATERIALS AND METHODS: Three databases were searched (2003-2015) to retrieve studies that evaluated serum 25-hydroxyvitamin D in PCOS women and controls. Meta-regression analysis was performed with anthropometric and metabolic/endocrine parameters as covariates...
August 10, 2017: European Journal of Clinical Investigation
https://www.readbyqxmd.com/read/28795340/vertebral-fractures-assessed-with-dual-energy-x-ray-absorptiometry-in-patients-with-addison-s-disease-on-glucocorticoid-and-mineralocorticoid-replacement-therapy
#18
Valentina Camozzi, Corrado Betterle, Anna Chiara Frigo, Veronica Zaccariotto, Martina Zaninotto, Erica De Caneva, Paola Lucato, Walter Gomiero, Silvia Garelli, Chiara Sabbadin, Monica Salvà, Miriam Dalla Costa, Marco Boscaro, Giovanni Luisetto
PURPOSE: to assess bone damage and metabolic abnormalities in patients with Addison's disease given replacement doses of glucocorticoids and mineralocorticoids. METHODS: A total of 87 patients and 81 age-matched and sex-matched healthy controls were studied. The following parameters were measured: urinary cortisol, serum calcium, phosphorus, creatinine, 24-h urinary calcium excretion, bone alkaline phosphatase, parathyroid hormone, serum CrossLaps, 25 hydroxyvitamin D, and 1,25 dihydroxyvitamin D...
August 9, 2017: Endocrine
https://www.readbyqxmd.com/read/28794553/vitamin-d-level-in-alopecia-areata
#19
Yasmeen Jabeen Bhat, Insha Latif, Rauf Malik, Iffat Hassan, Gousia Sheikh, Kouser Sideeq Lone, Sabiya Majeed, Peerzada Sajad
BACKGROUND: Alopecia areata (AA) is an immune-mediated disease in which autoantigens play an important part in activating T-lymphocytes. Vitamin D has been associated with various autoimmune diseases, and Vitamin D receptors are strongly expressed in hair follicles and their expression in keratinocytes is necessary for the maintenance of the normal hair cycle. AIM: The aim of this study was to find the association between Vitamin D level and AA. MATERIALS AND METHODS: This was a hospital-based cross-sectional study in which 50 patients with clinically and trichoscopically diagnosed AA cases, and 35 healthy age- and sex-matched controls were studied in summer months...
July 2017: Indian Journal of Dermatology
https://www.readbyqxmd.com/read/28794297/re-association-between-25-hydroxyvitamin-d-level-and-inflammatory-and-nutritional-factors-in-hemodialysis-and-peritoneal-dialysis-patients-in-qom-iran
#20
Behzad Einollahi, Aidin Lotfiazar
No abstract text is available yet for this article.
July 2017: Iranian Journal of Kidney Diseases
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