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Vitamin D

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32 papers 1000+ followers
By Faye Kehler Family Physician and GP Anesthetist since 1987 interested in all aspects of Medicine
https://www.readbyqxmd.com/read/26644915/vitamin-d-and-the-skin-focus-on-a-complex-relationship-a-review
#1
REVIEW
Wedad Z Mostafa, Rehab A Hegazy
The "sunshine" vitamin is a hot topic that attracted ample attention over the past decades, specially that a considerable proportion of the worldwide population are deficient in this essential nutrient. Vitamin D was primarily acknowledged for its importance in bone formation, however; increasing evidence point to its interference with the proper function of nearly every tissue in our bodies including brain, heart, muscles, immune system and skin. Thereby its deficiency has been incriminated in a long panel of diseases including cancers, autoimmune diseases, cardiovascular and neurological disorders...
November 2015: Journal of Advanced Research
https://www.readbyqxmd.com/read/24838406/effect-of-vitamin-d3-on-asthma-treatment-failures-in-adults-with-symptomatic-asthma-and-lower-vitamin-d-levels-the-vida-randomized-clinical-trial
#2
RANDOMIZED CONTROLLED TRIAL
Mario Castro, Tonya S King, Susan J Kunselman, Michael D Cabana, Loren Denlinger, Fernando Holguin, Shamsah D Kazani, Wendy C Moore, James Moy, Christine A Sorkness, Pedro Avila, Leonard B Bacharier, Eugene Bleecker, Homer A Boushey, James Chmiel, Anne M Fitzpatrick, Deborah Gentile, Mandeep Hundal, Elliot Israel, Monica Kraft, Jerry A Krishnan, Craig LaForce, Stephen C Lazarus, Robert Lemanske, Njira Lugogo, Richard J Martin, David T Mauger, Edward Naureckas, Stephen P Peters, Wanda Phipatanakul, Loretta G Que, Ajay Sheshadri, Lewis Smith, Julian Solway, Lisa Sullivan-Vedder, Kaharu Sumino, Michael E Wechsler, Sally Wenzel, Steven R White, E Rand Sutherland
IMPORTANCE: In asthma and other diseases, vitamin D insufficiency is associated with adverse outcomes. It is not known if supplementing inhaled corticosteroids with oral vitamin D3 improves outcomes in patients with asthma and vitamin D insufficiency. OBJECTIVE: To evaluate if vitamin D supplementation would improve the clinical efficacy of inhaled corticosteroids in patients with symptomatic asthma and lower vitamin D levels. DESIGN, SETTING, AND PARTICIPANTS: The VIDA (Vitamin D Add-on Therapy Enhances Corticosteroid Responsiveness in Asthma) randomized, double-blind, parallel, placebo-controlled trial studying adult patients with symptomatic asthma and a serum 25-hydroxyvitamin D level of less than 30 ng/mL was conducted across 9 academic US medical centers in the National Heart, Lung, and Blood Institute's AsthmaNet network, with enrollment starting in April 2011 and follow-up complete by January 2014...
May 2014: JAMA: the Journal of the American Medical Association
https://www.readbyqxmd.com/read/25511115/rapid-normalization-of-vitamin-d-levels-a-meta-analysis
#3
J Dayre McNally, Klevis Iliriani, Supichaya Pojsupap, Margaret Sampson, Katie O'Hearn, Lauralyn McIntyre, Dean Fergusson, Kusum Menon
BACKGROUND: Vitamin D deficiency may represent a modifiable risk factor to improve outcome in severe illness. The efficacy of high-dose regimens in rapid normalization of vitamin D levels is uncertain. METHODS: We conducted a systematic review of pediatric clinical trials administering high-dose vitamin D to evaluate 25-hydroxyvitamin D (25[OH]D) response and characteristics associated with final 25(OH)D levels by using Medline, Embase, and the Cochrane Central Register of Controlled Trials, including reference lists of systematic reviews and eligible publications...
January 2015: Pediatrics
https://www.readbyqxmd.com/read/25423563/association-of-vitamin-d-status-of-septic-patients-in-intensive-care-units-with-altered-procalcitonin-levels-and-mortality
#4
Zhaoyan Chen, Zuojie Luo, Xiaoqin Zhao, Qiang Chen, Jieyu Hu, Hua Qin, Yingfen Qin, Xinghuan Liang, Yingjun Suo
OBJECTIVE: The purpose of this study was to determine whether vitamin D levels correlate with procalcitonin (PCT) levels and mortality in septic patients. METHODS: The following data were collected from 236 patients upon admission to intensive care units (ICUs): demographics; Acute Physiology and Chronic Health Evaluation (APACHE) II score; Sequential Organ Failure Assessment (SOFA) score; 25-hydroxyvitamin D (25OHD), PCT, intact PTH, albumin, creatinine, and ionized calcium (iCa) levels; 25OHD sampling seasonality; fluid load (colloid and crystalloid before 25OHD sampling); mechanical ventilation duration; and length of stay (LOS) in the ICU...
February 2015: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/25418140/femoral-volumetric-bone-density-geometry-and-strength-in-relation-to-25-hydroxy-vitamin-d-in-older-men
#5
Elizabeth N Martin, Elizabeth M Haney, Jackie Shannon, Jane A Cauley, Kristine E Ensrud, Tony M Keaveny, Joseph M Zmuda, Eric S Orwoll, Stephanie Litwack Harrison, Lynn M Marshall
Low serum 25-hydroxy vitamin D (25(OH)D) concentrations are associated with increased hip fracture risk and decreased femoral areal bone mineral density (BMD) among elderly men. Structural dimensions of the proximal femur and volumetric BMD in cortical and trabecular compartments are also associated with hip fracture risk. However, associations of volumetric BMD or structural dimensions with serum 25(OH)D concentrations among older men remain unclear. In a random sample of 1608 men aged ≥65 years from the Osteoporotic Fractures in Men Study (MrOS), baseline serum 25(OH)D concentrations were measured by liquid chromatography/mass spectrometry assays...
March 2015: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/25419673/summaries-for-patients-screening-for-vitamin-d-deficiency-in-adults-us-preventive-services-task-force-recommendation-statement
#6
(no author information available yet)
No abstract text is available yet for this article.
January 20, 2015: Annals of Internal Medicine
https://www.readbyqxmd.com/read/24753153/calcium-and-vitamin-d-in-sarcoidosis-is-supplementation-safe
#7
Lieke S Kamphuis, Femke Bonte-Mineur, Jan A van Laar, P Martin van Hagen, Paul L van Daele
Granulomas in sarcoidosis express high levels of 1α-hydroxylase, an enzyme that catalyzes the hydroxylation of 25-OH vitamin D to its active form, 1,25(OH)2 vitamin D. Overproduction of 1α-hydroxylase is held responsible for the development of hypercalcemia in sarcoidosis patients. Corticosteroids are used as first-line treatment in organ-threatening sarcoidosis. In this light, osteoporosis prevention with calcium and vitamin D (CAD) supplementation is often warranted. However, sarcoidosis patients are at risk for hypercalcemia, and CAD supplementation affects the calcium metabolism...
November 2014: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/25331710/vitamin-d-deficiency-is-associated-with-inflammatory-cytokine-concentrations-in-patients-with-diabetic-foot-infection
#8
Shalbha Tiwari, Daliparthy Devi Pratyush, Sanjeev Kumar Gupta, Surya Kumar Singh
Vitamin D has been recognised as a potent immunomodulator and its deficiency is common in different population groups including patients with diabetic foot infection. Diabetic foot infection reflects the altered immune status of the host. As cytokine regulation plays a significant role in infection and wound-healing processes, the present study aimed to evaluate the association between vitamin D status and inflammatory cytokine profiles in patients with diabetic foot infection. The serum concentrations of vitamin D (25-hydroxyvitamin D), IL-1β, IL-6, TNF-α and interferon-γ (IFN-γ) were measured in 112 diabetic foot infection cases and 109 diabetic controls...
December 28, 2014: British Journal of Nutrition
https://www.readbyqxmd.com/read/25233808/association-between-serum-25-hydroxyvitamin-d-levels-measured-24-hours-after-delivery-and-postpartum-depression
#9
C-W Fu, J-T Liu, W-J Tu, J-Q Yang, Y Cao
OBJECTIVE: To assess the possible relationship between serum levels of 25[OH]D (25-hydroxyvitamin D) collected 24 hours after delivery and postpartum depression in a Chinese cohort sample. DESIGN: Cohort study. SETTING: One city hospital in Beijing, China. POPULATION: Women delivering a full-term, singleton, live-born infant at one city hospital in Beijing between August 2013 and November 2013. METHODS: Women were enrolled immediately postpartum...
November 2015: BJOG: An International Journal of Obstetrics and Gynaecology
https://www.readbyqxmd.com/read/25211176/determinants-of-vitamin-d-status-in-caucasian-adults-influence-of-sun-exposure-dietary-intake-sociodemographic-lifestyle-anthropometric-and-genetic-factors
#10
Mathilde Touvier, Mélanie Deschasaux, Marion Montourcy, Angela Sutton, Nathalie Charnaux, Emmanuelle Kesse-Guyot, Karen E Assmann, Léopold Fezeu, Paule Latino-Martel, Nathalie Druesne-Pecollo, Christiane Guinot, Julie Latreille, Denis Malvy, Pilar Galan, Serge Hercberg, Sigrid Le Clerc, Jean-Claude Souberbielle, Khaled Ezzedine
Very few studies have investigated the determinants of serum vitamin D levels using a set of variables that include simultaneously sun exposure, phototype, dietary intake, sociodemographics, anthropometric, lifestyle data, and genetic polymorphisms. Our objective was to investigate the associations between all these parameters and vitamin D status in a large sample of French adults. This cross-sectional survey was based on 1,828 middle-aged Caucasian adults from the SU.VI.MAX (SUpplémentation en VItamines et Minéraux AntioXydants) study...
February 2015: Journal of Investigative Dermatology
https://www.readbyqxmd.com/read/25207384/optimal-serum-25-hydroxyvitamin-d-levels-for-multiple-health-outcomes
#11
REVIEW
Heike A Bischoff-Ferrari
Recent evidence suggests that vitamin D deficiency has harmful effects on health and that recent vitamin D intake recommendations may be associated with better health outcomes. In this chapter, evidence is summarized from different studies that evaluate threshold levels for serum 25(OH)D levels in relation to bone mineral density (BMD), lower extremity function, dental health, risk of falls, fractures, cancer prevention, incident hypertension and mortality. For all endpoints, levels in the deficient range (< 50 nmol/l; < 20 ng/ml) are associated with no benefit or adverse effects, while the most advantageous serum levels for 25(OH)D appeared to be close to 75 nmol/l (30 ng/ml)...
2014: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/25207379/ultraviolet-exposure-scenarios-risks-of-erythema-from-recommendations-on-cutaneous-vitamin-d-synthesis
#12
Ann R Webb, Ola Engelsen
Exposure to sunlight is a major source of vitamin D for most people yet public health advice focuses overwhelmingly on avoiding exposure of unprotected skin because of the risks oferythema and skin cancer. We have calculated the exposure required to gain a number of proposed oral-equivalent doses of vitamin D, as functions of latitude, season, skin type and skin area exposed, together with the associated risk of erythema, expressed in minimum erythema doses. The model results show that the current recommended daily intake of 400 IU is readily achievable through casual sun exposure in the midday lunch hour, with no risk of erythema, for all latitudes some of the year and for all the year at some (low) latitudes...
2014: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/25207368/ultraviolet-damage-dna-repair-and-vitamin-d-in-nonmelanoma-skin-cancer-and-in-malignant-melanoma-an-update
#13
REVIEW
Jörg Reichrath, Knuth Rass
Skin exposure with UV radiation (UV) is the main cause of skin cancer development. Epidemiological data indicate that excessive or cumulative UV exposure takes place years and decades before the resulting malignancies arise. The most important defense mechanisms that protect human skin against UV radiation involve melanin synthesis and active repair mechanisms. DNA is the major target of direct or indirect UV-induced cellular damage. Low pigmentation capacity in white Caucasians and rare congenital defects in DNA repair are mainly responsible for protection failures...
2014: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/25197306/effect-of-vitamin-d-on-insulin-resistance-and-nephropathy-in-type-2-diabetes
#14
Hamid Nasri, Mahmoud Rafieian-Kopaei
No abstract text is available yet for this article.
June 2014: Journal of Research in Medical Sciences: the Official Journal of Isfahan University of Medical Sciences
https://www.readbyqxmd.com/read/25112493/vitamin-d-insufficiency-and-abnormal-hemoglobin-a1c-in-black-and-white-older-persons
#15
MULTICENTER STUDY
Jatupol Kositsawat, George A Kuchel, Janet A Tooze, Denise K Houston, Jane A Cauley, Stephen B Kritchevsky, Elsa S Strotmeyer, Alka M Kanaya, Tamara B Harris, Karen C Johnson, Lisa C Barry
BACKGROUND: Although vitamin D has been mechanistically linked to insulin secretion and sensitivity, it remains unclear whether low 25-hydroxyvitamin D levels confer an increased risk of impaired glucose metabolism. We evaluated the relationship between vitamin D insufficiency (25-hydroxyvitamin D < 20ng/mL) and abnormal hemoglobin A1c (A1c) (≥6.5%) in community-dwelling older persons and examined whether this relationship differed according to race. METHODS: Participants were 2,193 persons of age 70-79 years at Year 1 (52% women; 37% black) in the Health, Aging, and Body Composition study who had clinic visits at Years 2 and 4...
April 2015: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
https://www.readbyqxmd.com/read/25112415/low-levels-of-25-hydroxy-vitamin-d-and-active-1-25-dihydroxyvitamin-d-independently-associated-with-type-2-diabetes-mellitus-in-older-australian-men-the-concord-health-and-ageing-in-men-project
#16
Vasant Hirani, Robert G Cumming, David G Le Couteur, Vasikaran Naganathan, Fiona Blyth, David J Handelsman, Louise M Waite, Markus J Seibel
OBJECTIVES: To examine the associations between serum 25-hydroxyvitamin D (25OHD) levels and the active vitamin D metabolite, 1,25-hydroxyvitamin D (1,25OHD), with type 2 diabetes mellitus (DM) in community-living men aged 70 and older. DESIGN: Cross-sectional. SETTING: A population-based, cross-sectional analysis of the baseline phase of the Concord Health and Ageing in Men Project (CHAMP), a large epidemiological study conducted in Sydney between January 2005 and May 2007...
September 2014: Journal of the American Geriatrics Society
https://www.readbyqxmd.com/read/25104821/active-vitamin-d-1-25-dihydroxyvitamin-d-is-associated-with-chronic-pain-in-older-australian-men-the-concord-health-and-ageing-in-men-project
#17
Vasant Hirani, Fiona M Blyth, Vasi Naganathan, Robert G Cumming, David G Le Couteur, David J Handelsman, Louise M Waite, Markus J Seibel
BACKGROUND: Although there is a conflicting evidence for an association between low serum 25-hydroxyvitamin D (25D) levels and pain, the relationship between pain and the active vitamin D metabolite, 1,25-hydroxyvitamin D (1,25D), has not been investigated. The aim of this study was to examine the associations between serum vitamin D metabolites: 25D and 1,25D with intrusive or chronic pain in community-living men aged ≥70 years. METHODS: Population-based, cross-sectional analysis of the baseline phase of the Concord Health and Ageing in Men Project, a large epidemiological study conducted in Sydney between January 2005 and May 2007...
March 2015: Journals of Gerontology. Series A, Biological Sciences and Medical Sciences
https://www.readbyqxmd.com/read/25070320/genetic-variants-in-cyp2r1-cyp24a1-and-vdr-modify-the-efficacy-of-vitamin-d3-supplementation-for-increasing-serum-25-hydroxyvitamin-d-levels-in-a-randomized-controlled-trial
#18
RANDOMIZED CONTROLLED TRIAL
Elizabeth L Barry, Judy R Rees, Janet L Peacock, Leila A Mott, Christopher I Amos, Roberd M Bostick, Jane C Figueiredo, Dennis J Ahnen, Robert S Bresalier, Carol A Burke, John A Baron
CONTEXT: Adequate serum 25-hydroxyvitamin D concentrations, [25(OH)D], are required for optimal bone health, and low levels are associated with chronic diseases. OBJECTIVE: We investigated whether 41 candidate single nucleotide polymorphisms (SNPs) in vitamin D and calcium pathway genes (GC, DHCR7, CYP2R1, CYP27B1, CYP24A1, VDR, and CASR) are associated with [25(OH)D] or modify the increase in [25(OH)D] from vitamin D3 supplementation. DESIGN AND SETTING: Baseline and year 1 [25(OH)D] measurements from a randomized controlled trial conducted at 11 clinical centers in the United States...
October 2014: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/25015343/vitamin-d-promotes-vascular-regeneration
#19
Michael Sze Ka Wong, Matthias S Leisegang, Christoph Kruse, Juri Vogel, Christoph Schürmann, Nathalie Dehne, Andreas Weigert, Eva Herrmann, Bernhard Brüne, Ajay M Shah, Dieter Steinhilber, Stefan Offermanns, Geert Carmeliet, Klaus Badenhoop, Katrin Schröder, Ralf P Brandes
BACKGROUND: Vitamin D deficiency in humans is frequent and has been associated with inflammation. The role of the active hormone 1,25-dihydroxycholecalciferol (1,25-dihydroxy-vitamin D3; 1,25-VitD3) in the cardiovascular system is controversial. High doses induce vascular calcification; vitamin D3 deficiency, however, has been linked to cardiovascular disease because the hormone has anti-inflammatory properties. We therefore hypothesized that 1,25-VitD3 promotes regeneration after vascular injury...
September 16, 2014: Circulation
https://www.readbyqxmd.com/read/25008852/25-hydroxyvitamin-d-in-african-origin-populations-at-varying-latitudes-challenges-the-construct-of-a-physiologic-norm
#20
MULTICENTER STUDY
Ramon A Durazo-Arvizu, Pauline Camacho, Pascal Bovet, Terrence Forrester, Estelle V Lambert, Jacob Plange-Rhule, Andrew N Hoofnagle, John Aloia, Bamidele Tayo, Lara R Dugas, Richard S Cooper, Amy Luke
BACKGROUND: The vitamin D-endocrine system is thought to play a role in physiologic processes that range from mineral metabolism to immune function. Serum 25-hydroxyvitamin D [25(OH)D] is the accepted biomarker for vitamin D status. Skin color is a key determinant of circulating 25(OH)D concentrations, and genes responsible for melanin content have been shown to be under strong evolutionary selection in populations living in temperate zones. Little is known about the effect of latitude on mean concentrations of 25(OH)D in dark-skinned populations...
September 2014: American Journal of Clinical Nutrition
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