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Vitamin D in health and disease.

BACKGROUND/PURPOSE: Investigations have revealed that vitamin D plays an important role in many areas of health and disease. Questions over whether sun avoidance and sunscreen use will decrease vitamin D levels may concern clinicians when counseling patients at risk for vitamin D insufficiency. A review of the role of vitamin D in health and disease, the impact of photoprotection and skin type on vitamin D levels, and recommendations for adequate vitamin D intake is provided to aid clinicians in counseling patients regarding these issues. RESULTS: Review of the literature indicates that adequ

Vitamin D and the immune system.

Evidence of the role of vitamin D in the regulation of T and B cells, macrophages, dendritic cells, and keratinocytes continues to accumulate and provides a link between vitamin D and many autoimmune diseases, including Crohn's disease, juvenile diabetes mellitus, multiple sclerosis, asthma, and rheumatoid arthritis. Considering the influence of vitamin D on the immune system, it may have potential as a treatment for immune-mediated diseases, even if additional research is required to better quantify dosage. But the biggest obstacle to its clinical use is its potent hypercalcemic effect. The c

Неклассическое действие витамина D.

Становится все более очевидным, что витамин D имеет широкий спектр действий в человеческом теле. Помимо его хорошо известного воздействия на гомеостаз кальция/фосфата, витамин D влияет на мышечную функцию, сердечно-сосудистую гомеостаз, нервную функцию и иммунную реакцию. Дефицит/недостаток витамина D был связан с мышечной слабостью и высоким уровнем заболеваемости различными хроническими заболеваниями, такими, как сердечно-сосудистые заболевания, рак, множественный склероз и тип 1 и 2 диабет. Самое важное то, что низкий уровень витамина D был признан независимым прогнозом смертности от всех п

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… Vitamin D Metabolism Vitamin D is unique among vitamins in that humans can produce it themselves in their skin provided they have sufficient exposure to ultraviolet radiation B (290-315 nm). … Although there is still some debate on how to classify vitamin D status, the vast majority of vitamin D researchers agree that 25(OH)D levels below 50 nmol/l are insufficient. Cellular vitamin D actions are mediated by a membrane-bound and a cytosolic vitamin D receptor (VDR). …

Витамин D: здоровье экстраскелета.

Недостаток витамина D является наиболее распространенным дефицитом питания и, вероятно, наиболее распространенным медицинским заболеванием в мире. Основной причиной дефицита витамина D является недостаточное понимание, которое требуется организму. 5- до 10-fold более высокие показатели потребления, чем это в настоящее время рекомендуется учреждениями здравоохранения. В настоящее время имеются исчерпывающие и убедительные научные и эпидемиологические данные, указывающие на то, что организм человека нуждается в уровне крови. 25(OH)D выше 30 нг/мл для максимального уровня здоровья. Повышение уров

[Update of oral vitamin B12].

OBJECTIVE: The objective of this review is to evaluate the usefulness of oral cobalamin (vitamin B12) treatment. MATERIAL AND METHOD: PubMed was systematically searched for English and French articles published from January 1990 to January 2007. RESULTS: Prospective randomized studies (n = 3), a systematic review by the Cochrane group (n = 1) and prospective studies in well-determined population (n = 5) provide evidence that oral cyanocobalamin therapy may adequately treat cobalamin deficiency in elderly patients. However, the current literature may not suggest a strategy in terms of the for

Vitamin D receptor activators.

The fields for clinical employment of vitamin D analogs are growing and under active evaluation in different medical specialties, ranging from dermatology to immunology and oncology. In this review we provide a brief description of the drugs that have been developed more specifically for the treatment of secondary hyperparathyroidism (SH) associated with uremia.

Is vitamin D the fountain of youth?

OBJECTIVE: To review the role of vitamin D deficiency for both classic and "nonclassic" effects and raise the caution that association does not prove causation. METHODS: The pertinent literature regarding vitamin D and its effects on bone, muscle function, immune function, glucose tolerance, cancer risk, and development of cardiovascular disease and other conditions is reviewed. In addition, the limitations of observational studies are discussed. RESULTS: Vitamin D inadequacy is common worldwide and classically causes osteomalacia and rickets. More recently, the contribution of low vitamin D

Vitamin A supplementation for cystic fibrosis.

BACKGROUND: People with cystic fibrosis and pancreatic insufficiency are at risk of fat soluble vitamin deficiency as these vitamins (A, D, E and K) are co-absorbed with fat. Thus, some cystic fibrosis centres routinely administer these vitamins as supplements but the centres vary in their approach of addressing the possible development of deficiencies in these vitamins. Vitamin A deficiency causes predominantly eye and skin problems while supplementation of vitamin A to excessive levels may cause harm to the respiratory and skeletal systems in children. Thus a systematic review on vitamin A s…

A cyclodecapeptide ligand to vitamin B12.

Libraries of cyclic decapeptides were screened with vitamin B(12) derivatives to give cyclic peptide ligands incorporating histidine and cysteine as coordinating residues and negatively charged amino acids. Two hits, cyclo-(HisAspGluProGlyIleAlaThrProdGln) and cyclo-(ValAspGluProGlyGluAspCysProdGln) were resynthesized in good yields for solution experiments. The peptides bind aquocobalamin with coordination of His or Cys to the cobalt with high affinities (K(a) approximately 10(5) M(-1)). Additional interactions between the peptide side chains and the vitamin B(12) corrin moiety were determine

Vitamin D and multiple sclerosis.

Vitamin D is a principal regulator of calcium homeostasis. However, recent evidence has indicated that vitamin D can have numerous other physiological functions including inhibition of proliferation of a number of malignant cells including breast and prostate cancer cells and protection against certain immune mediated disorders including multiple sclerosis (MS). The geographic incidence of MS indicates an increase in MS with a decrease in sunlight exposure. Since vitamin D is produced in the skin by solar or UV irradiation and high serum levels of 25-hydroxyvitamin D (25(OH)D) have been report

Vitamin D in health and disease.

Vitamin D functions in the body through both an endocrine mechanism (regulation of calcium absorption) and an autocrine mechanism (facilitation of gene expression). The former acts through circulating calcitriol, whereas the latter, which accounts for more than 80% of the metabolic utilization of the vitamin each day, produces, uses, and degrades calcitriol exclusively intracellularly. In patients with end-stage kidney disease, the endocrine mechanism is effectively disabled; however, the autocrine mechanism is able to function normally so long as the patient has adequate serum levels of 25(OH

Diabetes and the vitamin d connection.

Vitamin D deficiency, which is common in children and adults, causes rickets, osteomalacia, and osteoporosis. Most organs and immune cells have a vitamin D receptor, and some also have the capacity to metabolize 25-hydroxyvitamin D to 1,25-dihydroxyvitamin D. 1,25-Dihydroxyvitamin D is a potent immunomodulator that also enhances the production and secretion of several hormones, including insulin. Vitamin D deficiency has been associated with increased risk of type 1 diabetes. Glycemic control and insulin resistance are improved when vitamin D deficiency is corrected and calcium supplementation

Vitamin D and musculoskeletal health.

Vitamin D is critical for calcium homeostasis. Following cutaneous synthesis or ingestion, vitamin D is metabolized to 25(OH)D and then to the active form 1,25(OH)2D. Low serum vitamin D levels are common in the general population and cause a decline in calcium absorption, leading to low serum levels of ionized calcium, which in turn trigger the release of parathyroid hormone, promoting skeletal resorption and, eventually, bone loss or osteomalacia. Vitamin D deficiency is generally defined as a serum 25(OH)D concentration <25-37 nmol/l (<10-15 ng/ml), but the definition of the milder state of

Vitamin D-resistant diseases.

Hereditary vitamin D receptor defects (HVDRDs) is a more appropriate and precise title for an inborn error of metabolism commonly known as pseudo-vitamin D deficiency or vitamin D dependency, type II. It is a rare autosomal recessive disorder, approximately 70 kindreds were described, but its main importance is elucidating the physiology of vitamin D and calcium homeostasis in humans. Patients usually develop the clinical and biochemical aberrations, identical to vitamin D deficiency, but with high serum levels of calcitriol, within the first year of life (i.e., muscle weakness, bone pain, def

[Experience of vitamin K2 in Thailand].

Vitamin K(2) has dual actions, stimulates osteoblastic functions, for synthesis of osteocalcin, osteonectin and other matrix bone proteins, in addition, new finding, in stem cell culture found osteoblast producing gene expression of collagen type 1, the other action, vitamin K(2) contains mild antiresorpion by inducing the osteoclastic apoptosis. Our study found that postmenopausal and elderly women have high risk of vitamin K(2) deficiency, comparing to the normal value of young, reproductive females. The efficacy of vitamin K(2) will be fulfill benefit after 6 months of administration, prolo