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vitamin d dose

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https://www.readbyqxmd.com/read/29137947/low-dose-vitamin-d-supplementation-and-incident-frailty-in-older-people-an-eight-year-longitudinal-study
#1
Francesco Bolzetta, Brendon Stubbs, Marianna Noale, Alberto Vaona, Jacopo Demurtas, Stefano Celotto, Alberto Cester, Stefania Maggi, Ai Koyanagi, Emanuele Cereda, Nicola Veronese
Hypovitaminosis D is associated with frailty, but if vitamin D supplementation may prevent the onset of frailty is poorly known. Therefore, we aimed to investigate whether vitamin D supplementation is associated with a lower risk of frailty. In this longitudinal study, 4,421 individuals at high risk or having knee osteoarthritis free from frailty at baseline (mean age: 61.3, females=58.0%) were followed for 8 years. Details regarding vitamin D supplementation were captured by asking whether the participant took vitamin D during the previous year, at least once per month...
November 11, 2017: Experimental Gerontology
https://www.readbyqxmd.com/read/29137124/asthmatic-patients-with-vitamin-d-deficiency-have-decreased-exacerbations-after-vitamin-replacement
#2
Paolo Solidoro, Michela Bellocchia, Ilaria Aredano, Alessio Mattei, Emanuele Pivetta, Filippo Patrucco, Monica Boita, Francesca de Blasio, Luisa Brussino, Giovanni Rolla, Caterina Bucca
BACKGROUND: Intervention studies with vitamin D in asthma are inconclusive for several reasons, such as inadequate dosing or duration of supplementation or uncontrolled baseline vitamin D status. Our aim was to evaluate the benefit of long term vitamin D add-on in asthmatic patients with actual vitamin D deficiency, that is a serum 25-hydroxy vitamin D (25-OHD ) below 20 ng/mL. METHODS: Serum 25-OHD, asthma exacerbations, spirometry and inhaled corticosteroids (CS) dose were evaluated in a cohort of 119 asthmatic patients...
November 11, 2017: Nutrients
https://www.readbyqxmd.com/read/29136775/high-parathyroid-hormone-concentration-in-tenofovir-treated-patients-are-due-to-inhibition-of-calcium-sensing-receptor-activity
#3
Alessandra Mingione, Katia Maruca, Federica Chiappori, Francesca Pivari, Caterina Brasacchio, Tiziana Quirino, Ivan Merelli, Laura Soldati, Paolo Bonfanti, Stefano Mora
Bone health impairment is a common finding in HIV-infected patients on antiretroviral treatment. High serum parathyroid hormone (PTH) concentration in patients on antiretroviral treatment containing tenofovir disoproxil fumarate (TDF) has been reported. Hyperparathyroidism was not always sustained by a reduction in vitamin D concentration. We thus hypothesized a direct inhibitory effect of TDF on the Calcium-sensing receptor (CaSR), leading to hyperparathyroidism. Human embryonic kidney cells were transfected with CASR wild-type gene or mutated in different sites (N124K, T1051G, C788T, T888M)...
November 7, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/29135370/pharmacokinetics-based-adjusted-versus-standard-dose-of-ribavirin-does-not-improve-virologic-response-rates-in-chronic-hepatitis-c-genotype-4-patients-a-randomized-controlled-trial
#4
Ibrahim H Altraif, Faisal Sanai, Mohammed A Babatin, Abduljaleel A Alalwan, Ayman A Abdo, Waleed Alhamoudi, Musthafa Peedikayil, Hamdan Alghamdi, Fahad Alsohaibani, Khalid A Alswat, Shazia Murtaza, Abdullah Alghamdi, Sara Altraif, Abdulrahman Aljumah, Fayaz A Handoo, Abdulkareem M AlBekairy, Hamad I Al-Ashgar, Mohammed Alquaiz, Mohammed A Alblawi, Waleed AlTamimi, Véronique Loustaud-Ratti, Pierre Marquett
Optimal doses of Ribavirin (RBV) for hepatitis C virus (HCV) treatment are not known. To assess the safety and efficacy of PegIFNalfa-2a in combination with an adjusted (ADJ) RBV dose based on early pharmacokinetics versus a fixed standard (STD) dose of RBV in chronic HCV genotype (GT) 4-naive patients in a randomized trial. One hundred eighty-one patients were randomized. The baseline variables were similar in both arms and females were 50.3% of the patients, 76.5% had minimal-moderate fibrosis (F0-2). Sustained virologic response (SVR) was achieved in 99 (54...
November 2017: Journal of Interferon & Cytokine Research
https://www.readbyqxmd.com/read/29135297/-vitamin-d-and-calcium-supplementation-in-elderly-patients-with-hip-fracture
#5
Antal Salamon, Erzsébet Toldy, Csaba Biró, Ákos Mátrai, Tibor Balassa, Zoltán Lőcsei
Vitamin D plays an important role in maintaining calcium and bone metabolism, a risk factor of osteoporosis, fall and fracture in old age. Reduction in D-vitamin levels associated with compensatory increased level of parathyroid hormone causes significant loss of bone matrix, so substitutions of vitamin D and calcium are very important. Many authors publish their recommended doses used for prevention of hip fracture during the last years. Some authors are satisfied only with vitamin D supplementation while others have better experiences with vitamin D and calcium substitution...
October 2017: Orvosi Hetilap
https://www.readbyqxmd.com/read/29128760/vitamin-d-deficiency-in-children-with-recurrent-respiratory-infections-with-or-without-immunoglobulin-deficiency
#6
Nel Dąbrowska-Leonik, Ewa Bernatowska, Małgorzata Pac, Wiktor Filipiuk, Jan Mulawka, Barbara Pietrucha, Edyta Heropolitańska-Pliszka, Katarzyna Bernat-Sitarz, Beata Wolska-Kuśnierz, Bożena Mikołuć
PURPOSE: The objective of this study was to evaluate thevitamin D concentration in patients with recurrent respiratory infections with or without immunoglobulin G, A or M (IgG, IgA, IgM) deficiency, and to find a correlation between the vitamin D concentration and the response to hepatitis B vaccination. MATERIALS AND METHOD: The study involved 730 patients with recurrent respiratory infections. The concentration of 25-hydroxyvitamin D (25(OH)D), immunoglobulins G, A and M, anti-HBs was determined...
November 9, 2017: Advances in Medical Sciences
https://www.readbyqxmd.com/read/29127362/functional-analysis-of-vdr-gene-mutation-r343h-in-a-child-with-vitamin-d-resistant-rickets-with-alopecia
#7
Min-Hua Tseng, Shih-Ming Huang, Fu-Sung Lo, Jing-Long Huang, Chih-Jen Cheng, Hwei-Jen Lee, Shih-Hua Lin
The functional study of different mutations on vitamin D receptor (VDR) gene causing hereditary vitamin D-resistant rickets (HVDRR) remains limited. This study was to determine the VDR mutation and the mechanisms of this mutation-causing phenotype in a family with HVDRR and alopecia. Phenotype was analyzed, and in vitro functional studies were performed. The proband and his affected sister exhibited typical HVDRR with alopecia, and their biochemical and radiographic abnormalities but not alopecia responded to supraphysiological doses of active vitamin D3...
November 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29126841/-exercise-as-a-protective-cardiovascular-and-metabolic-factor-in-end-stage-renal-disease-patients
#8
Myriam Isnard-Rouchon, Céline Coutard
OBJECTIVE: The aim of the study was to test the effectiveness of Physical Activity (PA) during haemodialysis as a protective treatment against cardiovascular (CV) diseases. METHODS: Eighty volunteer patients were included in this multicentric prospective study and followed for two years: 40 patients in the Exercise group (EX), 40 patients in the Control group (Ctrl). CV risk factors: Total Cholesterol, HDL Cholesterol (HDL-c), LDL cholesterol (LDL-c), Triglycerides (TG) and Hemoglobin (Hb), and Prealbumin, Albumin, Parathormon, 25-OH Vitamin D, were checked at Month 0 (M0) and Month 24 (M24)...
November 7, 2017: Néphrologie & Thérapeutique
https://www.readbyqxmd.com/read/29126319/effects-of-vitamin-d-supplementation-on-semen-quality-reproductive-hormones-and-live-birth-rate-a-randomized-clinical-trial
#9
Martin Blomberg Jensen, Jacob Gerner Lawaetz, Jørgen Holm Petersen, Anders Juul, Niels Jørgensen
Context: Animal models and cross-sectional cohort studies have suggested a beneficial role for vitamin D in male reproduction. Objective: Determine the effect of vitamin D and calcium supplementation on semen quality in infertile men with serum 25-hydroxyvitamin-D (25OHD)≤ 50 nmol/l. Design: A single centre, triple-blinded, randomized clinical trial. Participants: 1427 infertile men were screened to include 330. 1002 men did not meet inclusion criteria and 95 did not wish to participate...
November 3, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/29125700/bioavailability-and-pharmacokinetics-of-trpv1-antagonist-mavatrep-jnj-39439335-tablet-and-capsule-formulations-in-healthy-men-two-open-label-crossover-single-dose-phase-1-studies
#10
Prasarn Manitpisitkul, Kevin Shalayda, Lucille Russell, Panna Sanga, Yinka Williams, Bhavna Solanki, Joseph Caruso, John A Moyer
To improve room temperature stability and oral bioavailability of mavatrep (JNJ-39439335, a transient receptor potential vanilloid subtype-1 antagonist), various formulations were initially developed and evaluated in 2 phase 1 open-label, randomized, 3-way crossover studies in healthy participants. Study 1 evaluated 2 new overencapsulated tablet formulations (formulations B and C) relative to an overencapsulated early tablet formulation (formulation A), using mavatrep HCl salt form. Because these tablets were still not room-temperature stable, in study 2: two free-base solid dispersion amorphous formulations (formulations D and E) were evaluated relative to the best encapsulated formulation from study 1 (formulation C) and also food effect...
November 10, 2017: Clinical Pharmacology in Drug Development
https://www.readbyqxmd.com/read/29124559/hungry-bone-syndrome-two-weeks-after-starting-cinacalcet-a-call-for-caution
#11
Sahar H Koubar, Abd Assalam Qannus, Walid Medawar, Ali K Abu-Alfa
Cinacalcet is an effective and safe alternative to parathyroidectomy in end stage renal disease (ESRD) patients with secondary hyperparathyroidism. Hypocalcemia is a known complication of treatment that is usually readily reversible upon discontinuation of the drug. It rarely manifests severely and symptomatically requiring hospital admission. We present the case of a 55 year old man with severe, symptomatic and prolonged hypocalcemia that occurred 2 weeks after starting cinacalcet. Cinacalcet induced a state of pharmacological parathyroidectomy with subsequent hungry bone syndrome...
November 9, 2017: CEN Case Reports
https://www.readbyqxmd.com/read/29122812/nebivolol-but-not-metoprolol-treatment-improves-endothelial-fibrinolytic-capacity-in-adults-with-elevated-blood-pressure
#12
Brian L Stauffer, Caitlin A Dow, Kyle J Diehl, Tyler D Bammert, Jared J Greiner, Christopher A DeSouza
BACKGROUND: Vascular endothelial fibrinolytic function is impaired in adults with prehypertension and hypertension and plays a mechanistic role in the development of atherothrombotic events. The influence of β-blockers on endothelial fibrinolysis is unknown. This study compared the effects of chronic nebivolol and metoprolol treatment on endothelial tissue-type plasminogen activator (t-PA) release in adults with elevated blood pressure (BP). METHODS AND RESULTS: Forty-four middle-aged adults (36% women) with elevated BP completed a 3-month, double-blind, randomized, placebo-controlled trial comparing nebivolol (5 mg/d), metoprolol succinate (100 mg/d), and placebo...
November 9, 2017: Journal of the American Heart Association
https://www.readbyqxmd.com/read/29116467/vitamin-d-supplementation-decreases-serum-27-hydroxycholesterol-in-a-pilot-breast-cancer-trial
#13
Catherine C Going, Ludmila Alexandrova, Kenneth Lau, Christine Y Yeh, David Feldman, Sharon J Pitteri
PURPOSE: 27-hydroxycholesterol (27HC), an endogenous selective estrogen receptor modulator (SERM), drives the growth of estrogen receptor-positive (ER+) breast cancer. 1,25-dihydroxyvitamin D (1,25(OH)2D), the active metabolite of vitamin D, is known to inhibit expression of CYP27B1, which is very similar in structure and function to CYP27A1, the synthesizing enzyme of 27HC. Therefore, we hypothesized that 1,25(OH)2D may also inhibit expression of CYP27A1, thereby reducing 27HC concentrations in the blood and tissues that express CYP27A1, including breast cancer tissue...
November 7, 2017: Breast Cancer Research and Treatment
https://www.readbyqxmd.com/read/29113496/both-youth-and-long-term-vitamin-d-status-is-associated-with-risk-of-type-2-diabetes-mellitus-in-adulthood-a-cohort-study
#14
Feitong Wu, Markus Juonala, Niina Pitkänen, Antti Jula, Terho Lehtimäki, Matthew A Sabin, Katja Pahkala, Nina Hutri-Kähönen, Mika Kähönen, Tomi Laitinen, Jorma S A Viikari, Costan G Magnussen, Olli T Raitakari
OBJECTIVES: To determine whether vitamin D status in childhood and adolescence (herein collectively referred to as youth) and the long-term status from youth to adulthood is associated with risk of developing type 2 diabetes mellitus (T2DM) and impaired fasting glucose (IFG) in adulthood. MATERIALS AND METHODS: This was a 31-year follow-up study of 2300 participants aged 3-18 years. Multinomial logistic regression was used to assess the association of both (a) baseline 25-hydroxyvitamin D (25OHD) levels and (b) the mean of baseline and the latest follow-up 25OHD levels (continuous variable and quartiles) with incident T2DM and IFG (cut-off = 5...
November 7, 2017: Annals of Medicine
https://www.readbyqxmd.com/read/29112461/calcium-and-vitamin-d-supplementation-in-boys-with-risperidone-induced-hyperprolactinemia-a-randomized-placebo-controlled-pilot-study
#15
Chadi A Calarge, James A Mills, Ekhard E Ziegler, Janet A Schlechte
BACKGROUND: The chronic use of antipsychotics has been associated with impaired bone mineralization, partially mediated by hyperprolactinemia. We examined if calcium and vitamin D supplementation promote bone mineral accrual in boys with risperidone-induced hyperprolactinemia. METHODS: Between February 2009 and November 2013, medically healthy, 5- to 17-year-old boys were enrolled in a 36-week double-blind, placebo-controlled study, examining the skeletal effects of supplementation with 1250 mg calcium carbonate and 400 IU of vitamin D3 in risperidone-induced hyperprolactinemia...
November 7, 2017: Journal of Child and Adolescent Psychopharmacology
https://www.readbyqxmd.com/read/29112181/vitamin-d-supplementation-in-respiratory-diseases-evidence-from-rct
#16
Carolien Mathyssen, Ghislaine Gayan-Ramirez, Roger Bouillon, Wim Janssens
Pulmonary diseases are one of the most important causes for morbidity and mortality. Although vitamin D is best known for its role in calcium, phosphorus and bone homeostasis, in the recent years vitamin D has gained attention because of a wide range of extra-skeletal effects including its immunomodulatory and antibacterial potential. Vitamin D deficiency is highly prevalent in chronic pulmonary diseases such as Chronic Obstructive Pulmonary Disease (COPD), cystic fibrosis, tuberculosis and asthma and several clinical studies have been conducted investigating the effect of vitamin D supplementation on disease outcomes...
November 2, 2017: Polish Archives of Internal Medicine
https://www.readbyqxmd.com/read/29112088/serum-25-hydroxy-vitamin-d-levels-in-very-low-birth-weight-infants-receiving-oral-vitamin-d-supplementation
#17
Upender K Munshi, Pauline D Graziano, Kara Meunier, Jennifer Ludke, Angel Rios
BACKGROUND: Vitamin D supplementation in preterm infants has been recommended by American Academy of Pediatrics (AAP) however its efficacy and safety has not been well studied. OBJECTIVE: To study 25 hydroxy vitamin D (25OHD) levels as a marker of vitamin D status of very low birth weight infants while on vitamin D supplementation during NICU hospitalization. METHODS: Retrospective study of preterm infants with birth weight <1500 g admitted to our unit from Jan 2013 to Dec 2015 who were on oral Vitamin D3 400 IU supplementation...
November 3, 2017: Journal of Pediatric Gastroenterology and Nutrition
https://www.readbyqxmd.com/read/29110708/co-expression-of-1%C3%AE-hydroxylase-and-vitamin-d-receptor-in-human-articular-chondrocytes
#18
Ann Kristin Hansen, Yngve Figenschau, Inigo Zubiaurre-Martinez
BACKGROUND: The aim was to investigate whether resident chondrocytes in human articular cartilage and in subculture express vitamin D receptor (VDR) and the enzyme that hydroxylates the prohormone 25(OH)D3 to the active hormone 1α,25(OH)2D3, namely 1α-hydroxylase (CYP27B1). Any putative effects of vitamin D on chondrocytes were also explored. METHODS: Cartilage from human osteoarthritic knee joints, cultured chondrocytes and cells grown in 3D spheroids were examined for the expression of VDR and 1α-hydroxylase by PCR, Western blots and immunolabelling...
November 6, 2017: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/29104103/dose-ranging-effects-of-vitamin-d3-on-the-geriatric-depression-score-a-clinical-trial
#19
Vinod Yalamanchili, J Christopher Gallagher
Depression is a common problem affecting millions, usually treated with selective serotonin uptake inhibitors. Interest in vitamin D as a co-therapy was stimulated by some association studies that correlated depression with low serum 25OHD levels. There are few longitudinal studies of vitamin D and depression and most are single doses of vitamin D. In this study we examined the effect of one-year treatment with several doses of vitamin D on the Geriatric depression score (GDS) in older Caucasian and African American women...
November 2, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/29102482/vitamin-c-a-new-player-in-regulation-of-the-cancer-epigenome
#20
REVIEW
Linn Gillberg, Andreas D Ørskov, Minmin Liu, Laurine B S Harsløf, Peter A Jones, Kirsten Grønbæk
Over the past few years it has become clear that vitamin C, as a provider of reduced iron, is an essential factor for the function of epigenetic regulators that initiate the demethylation of DNA and histones. Vitamin C deficiency is rare in the general population, but is frequently observed in patients with cancer. Genes encoding epigenetic regulators are often mutated in cancer, underscoring their central roles in carcinogenesis. In hematological cancers, such as acute myeloid leukemia (AML) and myelodysplastic syndrome (MDS), drugs that reverse epigenetic aberrations are now the standard of care...
November 1, 2017: Seminars in Cancer Biology
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