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1,25 hydroxyvitamin D

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https://www.readbyqxmd.com/read/28429905/maintenance-vitamin-d3-dosage-requirements-in-chinese-women-with-post-menopausal-osteoporosis-living-in-the-tropics
#1
Yogeswari Venugopal, Sharifah F Wan Muhamad Hatta, Nurbazlin Musa, Siti Abdul Rahman, Jeyakantha Ratnasingam, Sharmila Sunita Paramasivam, Lee Ling Lim, Luqman Ibrahim, Karen Choong, Alexander Tb Tan, Karuthan Chinna, Siew Pheng Chan, Shireene R Vethakkan
BACKGROUND AND OBJECTIVES: Vitamin D3 (cholecalciferol) dose required to maintain sufficiency in non- Caucasian women with postmenopausal osteoporosis (PMO) inthe tropics has not been well studied. Some guidelines mandate 800-1000 IU vitamin D/day but the Endocrine Society (US) advocates 1500-2000 IU/day to maintain 25-hydroxyvitamin-D (25(OH)D) concentration at >75 nmol/L. We aimed to establish oral cholecalciferol dose required to maintain 25(OH)D concentration at >75 nmol/L in PMO Chinese Malaysian women, postulating lower dose requirements amongst light-skinned subjects in the tropics...
May 2017: Asia Pacific Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/28429558/is-there-a-role-or-target-value-for-nutritional-vitamin-d-in-chronic-kidney-disease
#2
Wai H Lim, Emma L Duncan
Vitamin D is important for bone health in the general population but the value of vitamin D supplementation, and the role of 25-hydroxyvitamin D independently of 1,25-dihydroxyvitmain D, in individuals with chronic kidney disease (CKD), particularly in those who require dialysis, remains uncertain. Supplementation may improve some biochemical parameters, such as reducing PTH levels in patients to CKD-stage 4 who have vitamin D deficiency; but it remains to be established whether the role of nutritional vitamin D in maintaining bone health in the general population can be extrapolated to the CKD population...
March 2017: Nephrology
https://www.readbyqxmd.com/read/28424259/maternal-vitamin-d-insufficiency-early-in-pregnancy-is-associated-with-increased-risk-of-preterm-birth-in-ethnic-minority-women-in-canada
#3
Negar Tabatabaei, Nathalie Auger, Catherine M Herba, Shuqin Wei, Catherine Allard, Guy D Fink, William D Fraser
Background: Maternal vitamin D insufficiency (plasma 25-hydroxyvitamin D [25(OH)D] <75 nmol/L) may play a role in ethnic disparities in rates of preterm and spontaneous preterm births.Objective: We explored the relation between maternal plasma 25(OH)D concentration in the first trimester (8-14 wk of gestation) and the risk of preterm and spontaneous preterm births (<37 wk of gestation) by ethnicity.Methods: We designed a case-control study that included 120 cases of preterm birth (<37 wk of gestation) and 360 term controls (≥37 wk of gestation) of singleton pregnancies from the 3D cohort, a multicenter study in 2456 pregnant women in Quebec, Canada...
April 19, 2017: Journal of Nutrition
https://www.readbyqxmd.com/read/28424184/demographic-lifestyle-and-genetic-determinants-of-circulating-concentrations-of-25-hydroxyvitamin-d-and-vitamin-d-binding-protein-in-african-american-and-european-american-women
#4
Song Yao, Chi-Chen Hong, Elisa V Bandera, Qianqian Zhu, Song Liu, Ting-Yuan David Cheng, Gary Zirpoli, Stephen A Haddad, Kathryn L Lunetta, Edward A Ruiz-Narvaez, Susan E McCann, Melissa A Troester, Lynn Rosenberg, Julie R Palmer, Andrew F Olshan, Christine B Ambrosone
Background: Vitamin D may have anticancer activities. The high prevalence of vitamin D deficiency in African Americans (AAs) may be a contributing factor to the cancer health disparities between AAs and European Americans (EAs).Objectives: We compared concentrations of 25(OH)D and vitamin D-binding protein (VDBP) in AA and EA women and investigated determinants of the vitamin D-biomarker concentrations in both populations.Design: We used data and biospecimens from 909 AA and 847 EA healthy control subjects from the Carolina Breast Cancer Study (CBCS) and the Women's Circle of Health Study (WCHS) in the African American Breast Cancer Epidemiology and Risk Consortium...
April 19, 2017: American Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/28423480/the-effect-of-high-dose-vitamin-d-supplementation-on-muscular-function-and-quality-of-life-in-postmenopausal-women-a-randomized-controlled-trial
#5
G Grimnes, N Emaus, K D Cashman, R Jorde
OBJECTIVE: Observational studies have suggested positive associations between serum 25-hydroxyvitamin D (25(OH)D) levels and muscular strength, balance and quality of life. Our aim was to examine whether high-dose vitamin D supplementation would improve these measures as compared to standard-dose vitamin D, as well as the possible muscular effects of Single Nucleotide Polymorphisms (SNPs) in genes encoding vitamin D-related enzymes. DESIGN: A 12-month randomized, double-blind, controlled trial where the participants received daily elemental calcium (1,000 mg) plus vitamin D3 (800 IU)...
April 19, 2017: Clinical Endocrinology
https://www.readbyqxmd.com/read/28418890/the-serum-25-hydroxyvitamin-d-levels-and-hip-fracture-risk-a-meta-analysis-of-prospective-cohort-studies
#6
REVIEW
Qing-Bo Lv, Xiang Gao, Xiang Liu, Zhen-Xuan Shao, Qian-Hui Xu, Li Tang, Yong-Long Chi, Ai-Min Wu
Hip fracture has increasingly become a social and economic burden. The relationship between serum 25-hydroxyvitamin D levels and the risk of hip fracture reported by previous studies remains controversial. We searched Pubmed and Embase to identify studies reporting the relationship between serum 25-hydroxyvitamin D levels and risk of hip fracture. Fifteen prospective cohort studies with a total of 51239 participants and 3386 hip fracture cases were included. By pooling the Relative Risk of the lowest vs. the highest categories indicated that lower levels of serum 25-hydroxyvitamin D were more likely to be a risk factor for hip fracture with adjusted Relative Risk (95%Confidence Interval) of 1...
March 17, 2017: Oncotarget
https://www.readbyqxmd.com/read/28417313/impact-of-season-and-different-vitamin-d-thresholds-on-prevalence-of-vitamin-d-deficiency-in-epidemiological-cohorts-a-note-of-caution
#7
Sara Schramm, Harald Lahner, Karl-Heinz Jöckel, Raimund Erbel, Dagmar Führer, Susanne Moebus
PURPOSE: We investigated the impact of different cut-offs on the prevalence of 25-hydroxyvitamin D [25-(OH)D] deficiency. METHODS: We used baseline data of 4149 participants (45-75 years, 50% women) of the population-based Heinz Nixdorf Recall study. Serum 25-(OH)D was measured with the Roche Cobas assay. Quartiles (p25, p50, and p75) were calculated. Data were stratified by months, sex, and age. According to the recommendations of 'Dachverband Osteologie', Endocrine Society and National Institute of Health we used 25-(OH)D thresholds of 12, 20, and 30 ng/ml to estimate vitamin D deficiency...
April 17, 2017: Endocrine
https://www.readbyqxmd.com/read/28416344/25-hydroxyvitamin-d3-serum-modulation-after-use-of-sunbeds-compliant-with-european-union-standards-a-randomized-open-observational-controlled-trial
#8
Benedikt Weber, Chantal C Bachmann, Ralph Braun, Alison G Abraham, Andreas L Serra, Günther F L Hofbauer
BACKGROUND: Regular use of sunbed exposure has been reported to increase 25-hydroxyvitamin-D3 [25(OH)D] serum levels. However, the influence of sunbeds compliant with the recent European Union standard EN-60335-2-27 on 25(OH)D serum levels is unknown. OBJECTIVE: We investigated the impact of standard sunbed use compliant with the European Union standard on 25(OH)D serum modulation and well-being. METHODS: In a randomized controlled study, 25(OH)D serum levels were measured at enrollment, after 1 week, and after completion of the 12-week period of sunbed use with twice weekly exposure and compared with the control group without any sunbed exposure...
April 14, 2017: Journal of the American Academy of Dermatology
https://www.readbyqxmd.com/read/28407138/calcium-and-bone-turnover-markers-in-acromegaly-a-prospective-controlled-study
#9
Tina Constantin, Vin Tangpricha, Reshma Shah, Nelson M Oyesiku, Octavian C Ioachimescu, James Ritchie, Adriana G Ioachimescu
Context: Acromegaly has been associated with calcium-phosphate and bone turnover alterations. Controlled studies of these interactions are sparse. Objective: To evaluate calcium and bone metabolism in active and treated acromegaly. Design/Setting/Patients: We conducted a controlled prospective study at a tertiary referral center. We studied 22 patients with acromegaly referred for surgical or medical therapy (ACM) and 22 with nonfunctioning pituitary adenomas referred for surgery (control)...
April 12, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28406464/vitamin-d-status-muscle-strength-and-physical-performance-decline-in-very-old-adults-a-prospective-study
#10
Antoneta Granic, Tom R Hill, Karen Davies, Carol Jagger, Ashley Adamson, Mario Siervo, Thomas B L Kirkwood, John C Mathers, Avan A Sayer
Mixed reports exist about the role of 25-hydroxyvitamin D (25(OH)D) in muscle ageing and there are few prospective studies involving the very old (aged ≥ 85) who are at highest risk of low 25(OH)D, loss of muscle mass and strength, and physical performance decline. In the Newcastle 85+ Study (n = 845), we aimed to determine the association between 25(OH)D season-specific quartiles (hereafter SQ1-SQ4), grip strength (GS) and physical performance decline (Timed Up-and-Go Test, TUG) over 5 years using mixed models...
April 13, 2017: Nutrients
https://www.readbyqxmd.com/read/28403948/association-between-early-pregnancy-vitamin-d-status-and-changes-in-serum-lipid-profiles-throughout-pregnancy
#11
Jaqueline Lepsch, Ilana Eshriqui, Dayana Rodrigues Farias, Juliana S Vaz, Amanda C Cunha Figueiredo, Amanda Rodrigues Amorim Adegboye, Alex Brito, Rana Mokhtar, Lindsay H Allen, Michael F Holick, Gilberto Kac
OBJECTIVE: To evaluate the associations between first trimester 25-hydroxyvitamin D [25(OH)D] status and changes in high-density lipoprotein cholesterol (HDL-c), low-density lipoprotein cholesterol (LDL-c), total cholesterol (TC), triglyceride (TG) concentrations, TG/HDL-c, and TC/HDL-c ratios throughout pregnancy. We hypothesized that first trimester 25(OH)D inadequacy is associated with lower concentrations of HDL-c and higher LDL-c, TC, TG, TG/HDL-c, and TC/HDL-c ratios throughout pregnancy...
May 2017: Metabolism: Clinical and Experimental
https://www.readbyqxmd.com/read/28403940/vitamin-d-replacement-in-children-adolescents-and-pregnant-women-in-the-middle-east-and-north-africa-a-systematic-review-and-meta-analysis-of-randomized-controlled-trials
#12
REVIEW
Marlene Chakhtoura, Sara El Ghandour, Khaled Shawwa, Elie A Akl, Asma Arabi, Ziyad Mahfoud, Robert Habib, Hassan Hoballah, Ghada El Hajj Fuleihan
INTRODUCTION: Hypovitaminosis D affects one-third to two-thirds of children and pregnant women from the Middle East and North Africa (MENA) region. OBJECTIVE: To evaluate in infants, children, adolescents and pregnant women, from the MENA region, the effect of supplementation with different vitamin D doses on the change in 25-hydroxyvitamin D [25(OH)D] level reached, and other skeletal and non-skeletal outcomes. METHODS: This is a systematic review of randomized controlled trials of vitamin D supplementation conducted in the MENA region...
May 2017: Metabolism: Clinical and Experimental
https://www.readbyqxmd.com/read/28401116/implementation-of-an-intervention-to-reduce-population-based-screening-for-vitamin-d-deficiency-a-cross-sectional-study
#13
Christopher Naugler, Brenda Hemmelgarn, Hude Quan, Fiona Clement, Tolulope Sajobi, Roger Thomas, Tanvir C Turin, William Hnydyk, Alex Chin, James Wesenberg
BACKGROUND: We describe the implementation of an intervention in Alberta in support of the Choosing Wisely Canada recommendation against population screening for vitamin D deficiency (as determined by serum total 25-hydroxyvitamin D testing). We hypothesized that the introduction of a specialized requisition for vitamin D testing would reduce the annual number of vitamin D tests performed. METHODS: We performed a cross-sectional observational study that included all vitamin D tests ordered in Alberta between Apr...
January 2017: CMAJ Open
https://www.readbyqxmd.com/read/28399453/structure-activity-relationship-study-of-vitamin-d-analogs-with-oxolane-group-in-their-side-chain
#14
Anna Y Belorusova, Andrea Martínez, Zoila Gándara, Generosa Gómez, Yagamare Fall, Natacha Rochel
Synthetic analogs of 1α,25-dihydroxyvitamin D3 (1,25(OH)2D3) have been developed with the goal of improving the biological profile of the natural hormone for therapeutic applications. Derivatives of 1,25(OH)2D3 with the oxolane moiety branched in the side chain at carbon C20, act as Vitamin D nuclear Receptor (VDR) superagonists being several orders of magnitude more active than the natural ligand. Here, we describe the synthesis and biological evaluation of three diastereoisomers of (1S, 3R)-Dihydroxy-(20S)-[(2″-hydroxy-2″-propyl)-tetrahydrofuryl]-22,23,24,25,26,27-hexanor-1α-hydroxyvitamin D3, with different stereochemistry at positions C2 and C5 of the oxolane ring branched at carbon C22 (1, C2RC5S; 2, C2SC5R; 3, C2SC5S)...
April 2, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28396533/joint-association-of-low-vitamin-d-and-vitamin-k-status-with-blood-pressure-and-hypertension
#15
Adriana J van Ballegooijen, Aivaras Cepelis, Marjolein Visser, Ingeborg A Brouwer, Natasja M van Schoor, Joline W Beulens
Low vitamin D and K status are both associated with an increased cardiovascular risk. New evidence from experimental studies on bone health suggest an interaction between vitamin D and K; however, a joint association with vascular health outcomes is largely unknown. To prospectively investigate whether the combination of low vitamin D and K status is associated with higher systolic and diastolic blood pressure in 402 participants and with incident hypertension in 231 participants free of hypertension at baseline...
April 10, 2017: Hypertension
https://www.readbyqxmd.com/read/28392936/25-oh-d-status-effect-of-d3-supplement
#16
J M Lukaszuk, P E Luebbers
BACKGROUND: Excess adipose tissue may lead to sequestrating of vitamin D, making it less available for use in the body. OBJECTIVE: This study determined if overweight or obese individuals (BMI > 25 kg m(-2)) had insufficient (<30 ng mL(-1)) levels of 25-hydroxyvitamin D [25(OH)D] and, if so, would serum levels respond to exogenous supplementation. METHODS: Sixty-three women who were overweight/obese (BMI = 31.07 ± 5...
March 2017: Obesity Science & Practice
https://www.readbyqxmd.com/read/28392579/mammographic-density-and-vitamin-d-levels-a-cross-sectional-study
#17
Loreen Straub, Johanna Riedel, Peter B Luppa, Johanna Wissing, Almut Artmann, Marion Kiechle, Vanadin Regina Seifert-Klauss
Background Some studies have already proposed an inverse association between vitamin D levels and breast density. As breast density is already considered an established risk factor for breast cancer, such a connection could offer a new starting point for the prevention of breast cancer. Material and Methods To investigate this suggested connection, a total of 412 pre- and 572 post-menopausal women for whom mammography was indicated were recruited into this cross-sectional study. In addition to a questionnaire-based interview on the patient's general and gynecological medical history, her eating habits and lifestyle, serum levels of 25-hydroxyvitamin D [25(OH)D], calcium, phosphate and creatinine were determined...
March 2017: Geburtshilfe und Frauenheilkunde
https://www.readbyqxmd.com/read/28391237/association-between-baseline-vitamin-d-metabolite-levels-and-long-term-cardiovascular-events-in-patients-with-rheumatoid-arthritis-from-the-cimestra-trial-protocol-for-a-cohort-study-with-patient-record-evaluated-outcomes
#18
M Herly, K Stengaard-Pedersen, K Hørslev-Petersen, M L Hetland, M Østergaard, R Christensen, B B Løgstrup, P Vestergaard, J Pødenphant, P Junker, T Ellingsen
INTRODUCTION: Cardiovascular morbidity and mortality is increased in patients with rheumatoid arthritis (RA), and among these patients, the prevalence of hypovitaminosis D is high. Moreover, low vitamin D levels have been associated with increased cardiovascular risk in healthy subjects. OBJECTIVE: To evaluate the long-term risk of cardiovascular events in patients having low total 25-hydroxyvitamin D levels at baseline compared with patients with normal levels, in an efficiently treated, closed cohort of patients with an early diagnosis of RA...
April 8, 2017: BMJ Open
https://www.readbyqxmd.com/read/28390394/hypovitaminosis-d-is-associated-with-negative-outcome-in-dogs-with-protein-losing-enteropathy-a-retrospective-study-of-43-cases
#19
K Allenspach, J Rizzo, A E Jergens, Y M Chang
BACKGROUND: Hypovitaminosis D has previously been shown to be prevalent amongst dogs with protein losing enteropathy (PLE). The hypothesis of this study was that Low 25-hydroxyvitamin D (25(OH) D) serum concentrations could be a risk factor for negative outcome in dogs with PLE. Forty-three dogs diagnosed with PLE (2005-2014) and which serum Vitamin D serum concentrations were collected and archived at -80 Degrees C were analyzed. Post-diagnostic communication with referring veterinarians was made to determine outcome of PLE dogss: Dogs which died due to PLE within 4 months after diagnosis (negative outcome group, n = 22) and dogs alive or which died due to another disease at the end point of the study (1 year after diagnosis, good outcome group, n = 21)...
April 8, 2017: BMC Veterinary Research
https://www.readbyqxmd.com/read/28390010/vitamin-d-supplementation-in-the-prevention-and-management-of-major-chronic-diseases-not-related-to-mineral-homeostasis-in-adults-research-for-evidence-and-a-scientific-statement-from-the-european-society-for-clinical-and-economic-aspects-of-osteoporosis-and
#20
Luisella Cianferotti, Francesco Bertoldo, Heike A Bischoff-Ferrari, Olivier Bruyere, Cyrus Cooper, Maurizio Cutolo, John A Kanis, Jean-Marc Kaufman, Jean-Yves Reginster, Rene Rizzoli, Maria Luisa Brandi
INTRODUCTION: Optimal vitamin D status promotes skeletal health and is recommended with specific treatment in individuals at high risk for fragility fractures. A growing body of literature has provided indirect and some direct evidence for possible extraskeletal vitamin D-related effects. PURPOSE AND METHODS: Members of the European Society for Clinical and Economic Aspects of Osteoporosis and Osteoarthritis have reviewed the main evidence for possible proven benefits of vitamin D supplementation in adults at risk of or with overt chronic extra-skeletal diseases, providing recommendations and guidelines for future studies in this field...
April 7, 2017: Endocrine
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