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vitamin d and calcium

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https://www.readbyqxmd.com/read/28342973/effects-of-a-sustained-release-formulation-of-1-25-dihydroxyvitamin-d3-glycosides-for-milk-fever-prevention-on-serum-1-25-dihydroxyvitamin-d3-calcium-and-phosphorus-in-dairy-cows
#1
Heinrich Bachmann, Michael Lanz, Susanne Kehrle, Wolfgang Bittner, Annick Toggenburger, Georg A Mathis, Walter Rambeck
Milk fever (MF) is a metabolic disease in dairy cows around parturition. The clinical lead sign is muscular paresis leading in severe cases to paralysis of the affected animal. Multiparturient animals of high performing dairy breeds are most likely to be affected and have a high probability of recurrence. An acute drop in blood calcium levels causes the disease when the demand for calcium at the onset of lactation exceeds the ability to replete blood calcium levels through mobilization from bone and intestinal uptake...
March 22, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28342856/reproductive-endocrinology-of-vitamin-d
#2
Mette Lorenzen, Ida Marie Boisen, Li Juel Mortensen, Beate Lanske, Anders Juul, Martin Blomberg Jensen
Vitamin D is a versatile hormone with several functions beyond its well-established role in maintenance of skeletal health and calcium homeostasis. The effects of vitamin D are mediated by the vitamin D receptor, which is expressed together with the vitamin D metabolizing enzymes in the reproductive tissues. The reproductive organs are therefore responsive to and able to metabolize vitamin D locally. The exact role remains to be clarified but several studies have suggested a link between vitamin D and production/release of reproductive hormones into circulation, which will be the main focus of this review...
March 22, 2017: Molecular and Cellular Endocrinology
https://www.readbyqxmd.com/read/28339866/relative-biological-value-of-1%C3%AE-hydroxycholecalciferol-to-25-hydroxycholecalciferol-in-broiler-chicken-diets
#3
J C Han, G H Chen, J L Zhang, J G Wang, H X Qu, Y F Yan, X J Yang, Y H Cheng
This study was conducted to evaluate the relative biological value (RBV) of 1α-hydroxycholecalciferol (1α-OH-D3) to 25-hydroxycholecalciferol (25-OH-D3) in one- to 21-day-old broiler chickens fed calcium (Ca)- and phosphorus (P)-deficient diets. On the d of hatch, 450 male Ross 308 broiler chickens were weighed and randomly allotted to 9 treatments with 5 replicates of 10 birds per replicate. The basal diet contained 0.50% Ca and 0.25% non-phytate phosphorus (NPP) but was not supplemented with cholecalciferol (vitamin D3)...
March 1, 2017: Poultry Science
https://www.readbyqxmd.com/read/28336833/-oral-calcimimetics-on-secondary-hyperparathyroidism-of-uremia
#4
Yasuo Imanishi
Secondary hyperparathyroidism of uremia is associated with poor health outcomes, including all-cause mortality, cardiovascular mortality, and fractures. Standard therapy for secondary hyperparathyroidism includes vitamin D receptor activators, and phosphate binders. Persistently elevated parathyroid hormone(PTH)levels may require the addition of calcimimetics which sensitizes calcium-sensing receptors on the parathyroid glands.
2017: Clinical Calcium
https://www.readbyqxmd.com/read/28336827/-pathophysiology-of-secondary-hyperparathyroidism
#5
Hiroo Kawarazaki
Secondary hyperparathyroidism(SHPT)is the result of a compensatory response of the calcium phosphate homeostatic mechanism. Vitamin D deficiency and chronic kidney disease, both representative pathophysiological causes of SHPT, have been related not only to skeletal disorders but also cardiovascular diseases, ADL and QOL. This relates the importance of SHPT as a pathological cause or marker of such states.
2017: Clinical Calcium
https://www.readbyqxmd.com/read/28336826/-etiology-and-pathogenesis-of-primary-hyperparathyroidism
#6
Mika Yamauchi, Toshitsugu Sugimoto
Primary hyperparathyroidism(pHPT)is a frequent endocrine disease in which abnormal calcium(Ca)regulation leads to hypercalcemia. The most frequent cause of pHPT in more than 80% of patients is an adenoma, followed by hyperplasia in about 15%, and cancer in 1~5%. Although most cases of pHPT are sporadic, a few are familial(hereditary), and this is known as familial hyperparathyroidism(FHPT). Gene abnormalities that affect cyclin D1 signaling(CCND1, CDC73, CDKN1B), Wnt/β-catenin signaling(MEN1), and calcium-sensing receptor signaling(CaSR, GNA11, AP2S1)play a role in the etiology and pathogenesis of pHPT...
2017: Clinical Calcium
https://www.readbyqxmd.com/read/28336823/-regulatory-mechanism-of-calcium-metabolism
#7
Keiichi Ozono
It is often difficult for terrestrial animals to take enough calcium. To maintain serum or extracellular calcium levels is very important for muscle and nerve function. Two major regulators to increase the serum calcium levels are parathyroid hormone(PTH)and vitamin D. PTH binds to the G protein coupling receptor, PTH1R, and increases intracellular cAMP levels. Impirement in the PTH signalling causes many diseases such as pseudohypoparathyroidism and acrodysostosis with hormone resistance. Vitamin D is activated to 1,25-dihydroxyvitamin D[1,25(OH)2D]by two steps of hydroxylation which occurs in the Liver and Kidney...
2017: Clinical Calcium
https://www.readbyqxmd.com/read/28336104/serum-25-hydroxyvitamin-d-and-metabolic-syndrome-in-a-japanese-working-population-the-furukawa-nutrition-and-health-study
#8
Shamima Akter, Masafumi Eguchi, Kayo Kurotani, Takeshi Kochi, Ikuko Kashino, Rie Ito, Keisuke Kuwahara, Hiroko Tsuruoka, Isamu Kabe, Tetsuya Mizoue
OBJECTIVE: Increasing evidence has suggested a protective role of vitamin D on metabolic syndrome (MetS). However, studies addressing this issue are limited in Asia and it remains unclear whether calcium could modify the association. We examined the association of serum 25-hydroxyvitamin D (25(OH)D) status with MetS, and the potential effect modification by calcium intake in a Japanese working population. METHODS: Study subjects were 1790 workers, ages 18 to 69 y, who participated in a health survey at the time of periodic checkup...
April 2017: Nutrition
https://www.readbyqxmd.com/read/28336103/25-hydroxyvitamin-d-is-differentially-associated-with-calcium-intakes-of-northern-central-and-southern-european-adolescents-results-from-the-helena-study
#9
Cristina Julian, Marcela González-Gross, Christina Breidenassel, Theodora Mouratidou, Germán Vicente-Rodriguez, Luis Gracia-Marco, Marika Ferrari, Kurt Widhalm, Dénes Molnár, Anthony Kafatos, Frederic Gottrand, Yannis Manios, Alejandro de la O, Mathilde Kersting, Stefaan De Henauw, Marc J Gunter, Luis A Moreno, Inge Huybrechts
OBJECTIVES: Adolescents in the European Union (EU) exhibit a higher prevalence of vitamin D (VitD) deficiency than other age groups. The degree to which sunlight exposure 25-hydroxyvitamin D [25(OH)D] concentrations depends on a variety of factors, including diet. Nevertheless, the relationship between calcium and VitD intake and 25(OH)D concentrations has not been previously studied among adolescents living in different EU countries and consequently in different latitudes. Therefore, the aim of this study was to examine whether calcium and VitD intakes are differentially associated with 25(OH)D in adolescents from northern, central and southern EU countries...
April 2017: Nutrition
https://www.readbyqxmd.com/read/28335477/association-between-circulating-vitamin-d-level-and-urolithiasis-a-systematic-review-and-meta-analysis
#10
REVIEW
Henglong Hu, Jiaqiao Zhang, Yuchao Lu, Zongbiao Zhang, Baolong Qin, Hongbin Gao, Yufeng Wang, Jianning Zhu, Qing Wang, Yunpeng Zhu, Yang Xun, Shaogang Wang
Many studies compared the serum/plasma 1,25 dihydroxyvitamin D₃ (1,25(OH)₂D) and 25 hydroxyvitamin D₃ (25(OH)D) between people with and without nephrolithiasis, and their results were conflicting. After systematically searching PubMed, Web of Science, The Cochrane Library, CNKI, and the Wanfang Database, we conducted a meta-analysis. Thirty-two observational studies involving 23,228 participants were included. Meta-analysis of these studies showed that of stone formers (SFs), calcium SFs had significantly higher concentrations of 1,25(OH)₂D (weighted mean difference (WMD), 10...
March 18, 2017: Nutrients
https://www.readbyqxmd.com/read/28333766/dietary-inadequacies-in-hiv-infected-and-uninfected-school-aged-children-in-johannesburg-south-africa
#11
Stephanie Shiau, Acadia Webber, Renate Strehlau, Faeezah Patel, Ashraf Coovadia, Samantha Kozakowski, Susan Brodlie, Michael T Yin, Louise Kuhn, Stephen M Arpadi
OBJECTIVES: The World Health Organization (WHO) recommends that HIV-infected children increase energy intake and maintain a balanced macronutrient distribution for optimal growth and nutrition. Few studies have evaluated dietary intake of HIV-infected children in resource-limited settings. METHODS: We conducted a cross-sectional analysis of the dietary intake of 220 perinatally HIV-infected children and 220 HIV-uninfected controls ages 5-9 years in Johannesburg, South Africa...
March 22, 2017: Journal of Pediatric Gastroenterology and Nutrition
https://www.readbyqxmd.com/read/28332412/drug-safety-evaluation-of-parathyroid-hormone-for-hypocalcemia-in-patients-with-hypoparathyroidism
#12
Gemma Marcucci, Giuseppe Della Pepa, Maria Luisa Brandi
Hypoparathyroidism is a rare disorder characterized by low serum calcium levels and high serum phosphate levels. This disease is commonly treated with calcium supplements and active vitamin D metabolites or analogues, but large doses of these supplements are often utilized to relieve the symptoms caused by hypocalcemia, without guarantee of a physiological normalization of calcium-phosphate homeostasis. Areas covered: Several studies have investigated replacement therapy with recombinant human PTH [rhPTH (1-84) and rhPTH (1-34)] for subjects with hypoparathyroidism...
March 23, 2017: Expert Opinion on Drug Safety
https://www.readbyqxmd.com/read/28330910/toward-personalized-calcium-and-vitamin-d-supplementation
#13
Roberto Civitelli, Timothy Peterson
No abstract text is available yet for this article.
March 22, 2017: American Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/28328529/evaluation-of-vitamin-d-prophylaxis-in-3-36-month-old-infants-and-children
#14
Alper Ozcan, Mustafa Kendirci, Meda Kondolot, Fatih Kardas, Leyla Akın
BACKGROUND: Vitamin D (VD) deficiency (VDD) is still a population-based health problem that affects people at different ages. The aim of this study was to evaluate VD prophylaxis for the prevention of VDD in (3-36)-month-old infants and children. METHODS: Infants and children aged between 3 and 36 months, with different etiologies, admitted to outpatient and inpatient clinics from October 2010 to October 2011 at the Children's Hospital of Erciyes University, were enrolled for the study...
March 22, 2017: Journal of Pediatric Endocrinology & Metabolism: JPEM
https://www.readbyqxmd.com/read/28327260/vitamin-d-and-dental-caries-in-primary-dentition
#15
Ana Lucia Seminario, Elizabet Velan
Traditionally classified as a vitamin, vitamin D represents a group of fat-soluble secosteroids with D2 (ergocalciferol) and D3 (cholecalciferol) being the most relevant of the group. The importance of this prohormone exceeds its known ability to maintain intra- and extracellular calcium and phosphate concentrations, thereby preserving essential metabolic functions such as the promotion of mineralization and maintenance and remodeling of the bone. Current observational research recognizes the potential antiproliferative, prodifferentiative, and immunomodulatory effects of vitamin D and its metabolites in the human body...
September 15, 2016: Journal of Dentistry for Children
https://www.readbyqxmd.com/read/28326519/influence-of-diet-on-the-risk-of-developing-endometriosis
#16
Joanna Jurkiewicz-Przondziono, Magdalena Lemm, Anna Kwiatkowska-Pamuła, Ewa Ziółko, Mariusz K Wójtowicz
Endometriosis is a hormone-dependent chronic inflammatory disease characterized by the presence of endometrium beyond the uterine cavity. The disease affects 5-15% of women of child-bearing age, 30-50% of whom suffer from infertility. Understanding the role of dietary factors in the development of endometriosis is critical to development of effective dietary instructions for prevention. Existing studies concerning nutrition and endometriosis suggest that diet is a potentially modifiable risk factor for endometriosis...
2017: Ginekologia Polska
https://www.readbyqxmd.com/read/28326354/vitamin-d-status-in-children-over-three-decades-do-children-get-enough-vitamin-d
#17
Björn Andersson, Diana Swolin-Eide, Per Magnusson, Kerstin Albertsson-Wikland
Vitamin D is a key player in the endocrine regulation of calcium and phosphate metabolism and plays a pivotal role in the acquisition of bone mass during childhood. This study investigated long-term data of vitamin D levels in children and adolescents between 1 and 18 years of age. Serum 25-hydroxyvitamin D (25(OH)D) was analyzed between 1982 and 2013 in 2048 Swedish Caucasian children (mean age ± SD, 8.59 ± 3.68 years; 1197 boys). Overall, 704 (34%) children had below recommended levels of 50 nmol/L; however, only 63 (3%) had levels below 25 nmol/L, i...
December 2016: Bone Reports
https://www.readbyqxmd.com/read/28324108/hypoparathyroidism-less-severe-hypocalcemia-with-treatment-with-vitamin-d2-compared-to-calcitriol
#18
Elizabeth A Streeten, Yasaman Mohtasebi, Manige Konig, Lisa Davidoff, Kathleen Ryan
Context: Options for chronic treatment of hypoparathyroidism include calcitriol, recombinant human parathyroid hormone and high dose vitamin D (D2). D2 is used in a minority because of fear of prolonged hypercalcemia and renal toxicity. There is a paucity of recent data about D2 use in hypoparathyroidism. Objective: Compare renal function, hypercalcemia and hypocalcemia in patients with hypoparathyroidism treated chronically with either D2 or calcitriol. Design, setting, patients: A retrospective study of patients with hypoparathyroidism treated at University of Maryland Hospital...
January 23, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28324001/cyp3a4-induction-by-rifampin-an-alternative-pathway-for-vitamin-d-inactivation-in-patients-with-cyp24a1-mutations
#19
Colin Patrick Hawkes, Dong Li, Hakon Hakonarson, Kevin E Meyers, Kenneth Thummel, Michael A Levine
Context: The P450 enzyme CYP24A1 is the principal inactivator of vitamin D metabolites. Biallelic loss-of-function mutations in CYP24A1 are associated with elevated serum levels of 1,25-dihydroxyvitamin D3 with consequent hypercalcemia and hypercalciuria, and represent the most common form of idiopathic infantile hypercalcemia (IIH). Current management strategies for this condition include a low calcium diet, reduced dietary vitamin D intake and limited sunlight exposure. CYP3A4 is a P450 enzyme that inactivates many drugs and xenobiotics and may represent an alternative pathway for inactivation of vitamin D metabolites...
March 3, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28323910/progressive-development-of-pth-resistance-in-patients-with-inactivating-mutations-on-the-maternal-allele-of-gnas
#20
Alessia Usardi, Asmaa Mamoune, Elodie Nattes, Jean-Claude Carel, Anya Rothenbuhler, Agnès Linglart
Background: PTH resistance is characterized by hypocalcaemia, hyperphosphatemia and elevated PTH in absence of vitamin D deficiency. Pseudohypoparathyroidism (PHP) type 1A (or iPPSD2, inactivating Signaling PTH/PTHrp Disorder 2 according to the new classification) is caused by mutations in the maternal GNAS allele. Objective: To assess PTH resistance over time in 20 patients affected by iPPSD2 (PHP1A), diagnosed because of family history, ectopic ossification or short stature and carrying a GNAS mutation...
February 21, 2017: Journal of Clinical Endocrinology and Metabolism
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