نتایج جستجو برای: oh d 25
تعداد نتایج: 919389 فیلتر نتایج به سال:
In serum, the primary indicator of vitamin D nutritional status is 25-hydroxyvitamin D [25(OH)D], whereas 1,25dihydroxyvitamin D [l,25(OH)2D1 reflects mineral and skeletal homeostasis. Essential for a reliable assay of 1,25(OH)2D in serum is its separation from 25(OH)D, because the latter circulates in a 1000-fold greater concentration and significantly cross-reacts with the receptors used in r...
Low 25-hydroxyvitamin D (25(OH)D) concentrations are common among older adults and are associated with poorer physical performance and strength, but results from longitudinal studies have been inconsistent. The 25(OH)D threshold for physical performance and strength was determined, and both cross-sectional and longitudinal associations between 25(OH)D and physical performance and strength were ...
BACKGROUND Vitamin D deficiency is increasingly being recognized and treated in patients with cystic fibrosis, although the treatment guidelines are not proven and the effectiveness of vitamin D preparations is untested. OBJECTIVES The aims of this study were to determine the prevalence of 25-hydroxyvitamin D [25(OH)D] deficiency in a large cohort of adults with cystic fibrosis and to evaluat...
Poor vitamin D status has been associated with increased risk and severity of respiratory tract infections. Whether or not inflammation and infection affects 25-hydroxy vitamin D (25(OH)D) concentration is controversial and is important in the interpretation of observational studies using plasma-25(OH)D as a biomarker for status. Our objectives were to measure whether 25(OH)D concentration was ...
1,25-Dihydroxyvitamin D(3)[1,25(OH)(2)D(3)] has many noncalcemic actions that rest on inhibition of proliferation and promotion of differentiation in malignant and normal cell types. 1,25(OH)(2)D(3) stimulates osteoblast differentiation of human marrow stromal cells (hMSCs), but little is known about the effects of 25-hydroxyvitamin D(3)[25(OH)D(3)] on these cells. Recent evidence shows that hM...
Relationships between 25-Hydroxyvitamin D and Nocturnal Enuresis in Five- to Seven-Year-Old Children
BACKGROUND Vitamin D has been recognized to contribute to various physiological processes. However, no study has investigated serum 25-hydroxyvitamin D [25(OH)D] concentrations in children with nocturnal enuresis (NE) in the English literature. OBJECTIVE In the present study, serum 25(OH)D concentrations were measured in five- to seven-year-old children with NE and compared with those in non-...
There have been several epidemiological studies of the association between 25-hydroxyvitamin D (25(OH)D) level and lung cancer risk. We explored the potential association between serum 25(OH)D levels and mutations in epidermal growth factor receptor (EGFR) in patients with pulmonary adenocarcinoma. We analyzed clinical data from 135 patients whose serum 25(OH)D levels were measured and EGFR mut...
There has been increasing interest in recent years in the prevalence of low 25-hydroxy (OH) vitamin D concentrations in different human populations [1, 2]. There are 2 forms of vitamin D: cholecalciferol (vitamin D3) and ergocalciferol (vitamin D2). Vitamin D3 is manufactured through the photoisomerization of 7-dehydrocholesterol to pre-vitamin D3, which then undergoes a temperature-dependent r...
BACKGROUND The role of vitamin D in the pathogenesis of rheumatoid arthritis is under investigation. This study was designed to evaluate the correlation between serum values of 25(OH) vitamin D [25(OH)D] and disease activity in rheumatoid arthritis (RA) patients according to Disease Activity Score 28 joints and ESR (DA S28 ESR). METHODS Ninety-nine patients according to ACR classification cri...
BACKGROUND several studies have been pointing towards a non-linear relationship between serum 25(OH)D and cardiovascular disease. Next to vitamin D deficiency, also higher levels of 25(OH)D have been reported to be associated with increased cardiovascular risk. We aimed to investigate the nature of the relationship between serum 25(OH)D and measures of arterial stiffness and arteriosclerosis in...
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