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https://www.readbyqxmd.com/read/29346788/vitamin-d-classic-and-novel-actions
#1
Ángel Gil, Julio Plaza-Diaz, María Dolores Mesa
BACKGROUND: Classically, vitamin D has been implicated in bone health by promoting calcium absorption in the gut and maintenance of serum calcium and phosphate concentrations, as well as by its action on bone growth and reorganization through the action of osteoblasts and osteoclasts cells. However, in the last 2 decades, novel actions of vitamin D have been discovered. The present report summarizes both classic and novel actions of vitamin D. SUMMARY: 1,25(OH)2 vitamin D, the active metabolite of vitamin D, also known as calcitriol, regulates not only calcium and phosphate homeostasis but also cell proliferation and differentiation, and has a key a role to play in the responses of the immune and nervous systems...
January 18, 2018: Annals of Nutrition & Metabolism
https://www.readbyqxmd.com/read/29345296/vitamin%C3%A2-d-derivatives-potentiate-the-anticancer-and-anti-angiogenic-activity-of-tyrosine-kinase-inhibitors-in-combination-with-cytostatic-drugs-in-an-a549-non-small-cell-lung-cancer-model
#2
Ewa Maj, Beata Filip-Psurska, Magdalena Milczarek, Mateusz Psurski, Andrzej Kutner, Joanna Wietrzyk
Numerous in vitro and in vivo studies have demonstrated that calcitriol [1,25(OH)2D3] and different vitamin D analogs possess antineoplastic activity, regulating proliferation, differentiation and apoptosis, as well as angiogenesis. Vitamin D compounds have been shown to exert synergistic effects when used in combination with different agents used in anticancer therapies in different cancer models. The aim of this study was to evaluate the mechanisms of the cooperation of the vitamin D compounds [1,24(OH)2D3 (PRI‑2191) and 1,25(OH)2D3] with tyrosine kinase inhibitors (imatinib and sunitinib) together with cytostatics (cisplatin and docetaxel) in an A549 non-small cell lung cancer model...
February 2018: International Journal of Oncology
https://www.readbyqxmd.com/read/29324674/calcitriol-supplementation-causes-decreases-in-tumorigenic-proteins-and-different-proteomic-and-metabolomic-signatures-in-right-versus-left-sided-colon-cancer
#3
Monica M Schroll, Katelyn R Ludwig, Kerry M Bauer, Amanda B Hummon
Vitamin D deficiency is a common problem worldwide. In particular, it is an issue in the Northern Hemisphere where UVB radiation does not penetrate the atmosphere as readily. There is a correlation between vitamin D deficiency and colorectal cancer incidence and mortality. Furthermore, there is strong evidence that cancer of the ascending (right side) colon is different from cancer of the descending (left side) colon in terms of prognosis, tumor differentiation, and polyp type, as well as at the molecular level...
January 11, 2018: Metabolites
https://www.readbyqxmd.com/read/29322021/the-role-and-timing-of-parathyroid-hormone-determination-after-total-thyroidectomy
#4
REVIEW
Ioanna G Mazotas, Tracy S Wang
Postoperative hypocalcemia is a common complication of total thyroidectomy resulting from manipulation, resection, or devascularization of the parathyroid glands. Parathyroid hormone (PTH) levels assessed in the perioperative period have been used to predict development of hypocalcemia. Articles examining the role of PTH measurement in the perioperative period following total or completion thyroidectomy are reviewed. Focus is placed on the timing of PTH measurement and the ability to predict which patients will develop hypocalcemia requiring supplementation...
December 2017: Gland Surgery
https://www.readbyqxmd.com/read/29313404/vitamin-d-diminishes-the-high-platelet-aggregation-of-type-2-diabetes-mellitus-patients
#5
Maya Sultan, Orit Twito, Tali Tohami, Erez Ramati, Eran Neumark, Gloria Rashid
Platelet activation is found in inflammatory conditions and implicated in the pathogenesis of chronic medical conditions, such as atherosclerosis, coronary vascular disease, cerebrovascular disease, and diabetes mellitus (DM). HbA1c is inversely related to vitamin D25 levels in individuals with and without DM. This study aimed to determine the relation between platelet aggregation, vitamin D and HbA1c among healthy individuals and those with Type 2 DM (T2DM). The direct effect of vitamin D1, 25 (calcitriol) on platelet aggregation was also investigated...
January 9, 2018: Platelets
https://www.readbyqxmd.com/read/29281993/vitamin-e-protects-against-extraskeletal-calcification-in-uremic-rats-fed-high-fat-diets
#6
Rafael Rios, Ana I Raya, Carmen Pineda, Mariano Rodriguez, Ignacio Lopez, Escolastico Aguilera-Tejero
BACKGROUND: High fat diets are implicated in the pathogenesis of metabolic syndrome, obesity and renal disease. Previous studies have revealed that high fat diets promote vascular calcification in uremic rats. Moreover, vitamin E has been shown to prevent uremic calcifications in genetically obese Zucker rats fed standard diet. The objective of this study was to investigate the influence of vitamin E supplementation on the development of extraskeletal calcifications in non-obese (wild type) uremic rats fed high fat diets...
December 28, 2017: BMC Nephrology
https://www.readbyqxmd.com/read/29280194/effect-of-prophylactic-calcitriol-administration-on-serum-ionized-calcium-concentrations-after-parathyroidectomy-78-cases-2005-2015
#7
A J Armstrong, J G Hauptman, B J Stanley, E Klocke, M Burneko, D E Holt, J J Runge, J A Rubin
BACKGROUND: Prophylactic administration of calcitriol has been suggested to mitigate the risk of hypocalcemia after parathyroidectomy. The effect of calcitriol on postoperative serum ionized calcium concentrations has not been evaluated in dogs after parathyroidectomy. HYPOTHESIS/OBJECTIVES: To determine the effect of prophylactic calcitriol administration on postoperative serum ionized calcium (iCa) concentrations in dogs with primary hyperthyroidism (PHPTH) treated by parathyroidectomy...
December 27, 2017: Journal of Veterinary Internal Medicine
https://www.readbyqxmd.com/read/29273827/stimulation-of-intestinal-calcium-absorption-by-orally-administrated-vitamin-d3-compounds-a-prospective-open-label-randomized-trial-in-osteoporosis
#8
K Uenishi, M Tokiwa, S Kato, M Shiraki
Intestinal fractional calcium absorption (FCA) was assessed before and after vitamin D3 treatment. Serum 1,25(OH)2D concentration was significantly increased by plain vitamin D3 and reduced by eldecalcitol. The 1α hydroxyl calcidiol and eldecalcitol treatments increased FCA, which may be induced through direct stimulation of vitamin D receptors in the intestine. INTRODUCTION: To assess the effects of vitamin D3 compounds on intestinal FCA and calcium-regulating hormones in post-menopausal osteoporosis, a randomized open-label prospective study was conducted...
December 23, 2017: Osteoporosis International
https://www.readbyqxmd.com/read/29248149/morphea-in-childhood-an-update
#9
B Aranegui, J Jiménez-Reyes
Morphea is an inflammatory, fibrosing skin disorder. When it occurs in childhood, it is also known as localized juvenile scleroderma. It is more common in girls and typically appears around the age of 5 to 7 years. According to a recent classification system, morphea is divided into 5 types: circumscribed (plaque), linear, generalized, pansclerotic, and mixed. Approximately 40% of patients present extracutaneous manifestations. Childhood morphea is treated with phototherapy, oral or topical calcitriol, topical tacrolimus 0...
December 13, 2017: Actas Dermo-sifiliográficas
https://www.readbyqxmd.com/read/29245970/calcitriol-induces-cell-senescence-of-kidney-cancer-through-jmjd3-mediated-histone-demethylation
#10
Yongqing Shen, Dan Yu, Pan Qi, Xuliang Wang, Xiaoqiang Guo, Aili Zhang
Calcitriol, also known as 1,25-dihydroxyvitamin D3 (1,25(OH)2VD3), is a biologically active form of vitamin D and has a wide range of anticancer activity against various cancer cell lines. However, the mechanism of calcitriol remains to be further studied. In this study, the biological effect and epigenetic regulation of calcitriol on kidney cancer cells were investigated. Calcitriol can significantly inhibit cell proliferation of kidney cancer cell lines 786-O (P<0.05). Calcitriol also induced cell apoptosis and senescence of 786-O and ACHN (P<0...
November 21, 2017: Oncotarget
https://www.readbyqxmd.com/read/29234503/study-protocol-for-a-phase-ii-dose-evaluation-randomized-controlled-trial-of-cholecalciferol-in-critically-ill-children-with-vitamin-d-deficiency-vitdal-picu-study
#11
Dayre McNally, Karin Amrein, Katharine O'Hearn, Dean Fergusson, Pavel Geier, Matt Henderson, Ali Khamessan, Margaret L Lawson, Lauralyn McIntyre, Stephanie Redpath, Hope A Weiler, Kusum Menon
Background: Clinical research has recently demonstrated that vitamin D deficiency (VDD) is highly prevalent in the pediatric intensive care unit (PICU) and associated with worse clinical course. Multiple adult ICU trials have suggested that optimization of vitamin D status through high-dose supplementation may reduce mortality and improve other clinically relevant outcomes; however, there have been no trials of rapid normalization in the PICU setting. The objective of this study is to evaluate the safety and efficacy of an enteral weight-based cholecalciferol loading dose regimen in critically ill children with VDD...
2017: Pilot and Feasibility Studies
https://www.readbyqxmd.com/read/29230685/calcitriol-reverses-the-down-regulation-pattern-of-tuberous-sclerosis-complex-genes-in-an-in-vitro-calcification-model
#12
Eraldo Fonseca Dos Santos Junior, Roberta Rodrigues de Lemos Gitirana, Darlene Paiva Bezerra, João Ricardo Mendes de Oliveira
Tuberous sclerosis complex (TSC) is a neurocutaneous syndrome with autosomal dominant inheritance, and most of the cases are related to loss of function of the TSC1 and TSC2 genes. TSC may occur with a wide range of clinical findings and skin, kidney, brain, and heart are the most commonly affected organs. Brain calcifications in TSC are also described and reported as diffuse and without pattern of symmetry or bilaterality. Recently, a new discovery opened the possibility of using vitamin D (VitD) for treating cerebral calcifications...
December 11, 2017: Journal of Molecular Neuroscience: MN
https://www.readbyqxmd.com/read/29216631/effect-of-cinacalcet-combined-with-calcitriol-on-the-clinical-outcome-and-bone-metabolism-in-patients-on-hemodialysis-with-severe-secondary-hyperparathyroidism
#13
Fang Yuan, Xing Chen, Chang Wang, Zheng Li, Hong Liu
OBJECTIVE: To observe the clinical outcome and the effect of bone metabolism of cinacalcet combined with calcitriol in maintenance hemodialysis (MHD) patients with severe secondary hyperparathyroidism (SHPT). METHODS: Thirty MHD patients with SHPT were enrolled into the study. All patients were given cinacalcet 25-75 mg and 0.5 μg calcitriol daily. Serum Ca, P, intact parathyroid hormone (iPTH), and bone metabolic markers were measured. The clinical symptoms and their changes were investigated...
December 7, 2017: Blood Purification
https://www.readbyqxmd.com/read/29205625/vitamin-d-facilitates-trophoblast-invasion-through-induction-of-epithelial-mesenchymal-transition
#14
Ryang Hee Kim, Byung Jun Ryu, Ki Mo Lee, Jae Won Han, Sung Ki Lee
PROBLEM: Vitamin D deficiency increases the risk of developing pregnancy-related complications, including preeclampsia and small-for-gestational-age infants. Vitamin D was demonstrated to promote the invasiveness of human extravillous trophoblasts (EVTs). However, whether vitamin D induces the epithelial-mesenchymal transition (EMT) of EVTs remains unclear. Therefore, we investigated whether vitamin D promotes EMT and the related signaling pathways. METHOD OF STUDY: In this study, we performed EMT experiments using JAR cells based on the expression of the mesenchymal markers and vitamin D receptor...
December 4, 2017: American Journal of Reproductive Immunology: AJRI
https://www.readbyqxmd.com/read/29196929/factors-associated-with-calcium-requirements-after-parathyroidectomy-in-chronic-kidney-disease-patients
#15
Yue Ding, Hongying Wang, Qiang Zou, Yiting Jin, Zijing Zhang, Junwen Huang
BACKGROUND: Renal hyperparathyroidism is a common complication of chronic kidney disease (CKD). Parathyroidectomy (PTX) for these patients continues to be a valuable option in the era of calcimimetics. Postoperative hypocalcemia is common after surgery. The aim of this study was to identify clinical factors to define postoperative calcium requirements. METHODS: From February 2013 to May 2017, 68 patients with chronic kidney disease 5 (CKD5) who underwent PTX were reviewed...
December 1, 2017: International Urology and Nephrology
https://www.readbyqxmd.com/read/29196166/1-25-oh-2d3-attenuates-pulmonary-arterial-hypertension-via-microrna-204-mediated-tgfbr2-smad-signaling
#16
Hua Yu, Min Xu, Yizhi Dong, Jingjing Liu, Yaozhe Li, Wei Mao, Jindan Wang, Liangxing Wang
Pulmonary arterial hypertension (PAH) is a devastating disease characterized by high pulmonary artery pressure. It is reported that microRNA-204 (miR-204) plays an important role in the development of PAH. Calcitriol [1,25-dihydroxyvitamin D3, 1,25(OH)2D3] mediates multiple pathophysiological processes. The aim of the current study was to explore the role of 1,25(OH)2D3 in PAH. PAH was induced in rats and rat pulmonary arterial endothelial cells (PAECs) were isolated as in vitro PAH model. The mean pulmonary artery pressure, morphologic changes, and expressions of transforming growth factor-beta1 (Tgfbr2), Smad2/7, alpha smooth muscle actin (α-SMA), and p21 were then measured...
November 28, 2017: Experimental Cell Research
https://www.readbyqxmd.com/read/29192005/successful-reversal-of-furosemide-induced-secondary-hyperparathyroidism-with-cinacalcet
#17
Tarak Srivastava, Shahryar Jafri, William E Truog, Judith Sebestyen VanSickle, Winston M Manimtim, Uri S Alon
Secondary hyperparathyroidism (SHPT) is a rare complication of furosemide therapy that can occur in patients treated with the loop diuretic for a long period of time. We report a 6-month-old 28-weeks premature infant treated chronically with furosemide for his bronchopulmonary dysplasia, who developed hypocalcemia and severe SHPT, adversely affecting his bones. Discontinuation of the loop diuretic and the addition of supplemental calcium and calcitriol only partially reversed the SHPT, bringing serum parathyroid hormone level down from 553 to 238 pg/mL...
December 2017: Pediatrics
https://www.readbyqxmd.com/read/29178579/vitamin-d-receptor-expression-in-canine-mammary-gland-and-relationship-with-clinicopathological-parameters-and-progesterone-oestrogen-receptors
#18
R Sánchez-Céspedes, M D Fernández-Martínez, A Raya, C Pineda, I López, Y Millán
The vitamin D receptor (VDR) belongs to the nuclear class II receptor family. VDR is a ligand transcription factor and mediates the actions of calcitriol, the active product of vitamin D synthesis. Nowadays, it is known that the biological actions of calcitriol include the capacity to modulate cancer features, such as proliferation and differentiation, apoptosis, angiogenesis, invasion and metastasis. VDR expression has been demonstrated in human breast cancer and vitamin D has emerged as a promising targeted therapy...
November 27, 2017: Veterinary and Comparative Oncology
https://www.readbyqxmd.com/read/29167863/association-of-parathyroid-hormone-level-with-postthyroidectomy-hypocalcemia-a-systematic-review
#19
Aarti Mathur, Neeraja Nagarajan, Stacie Kahan, Eric B Schneider, Martha A Zeiger
Importance: There has been an increased interest in measuring parathyroid hormone (PTH) levels as an early predictive marker for the development of hypocalcemia after total thyroidectomy. However, significant variation exists in the timing, type of assay, and thresholds of PTH in the literature. Objective: We performed a systematic review to examine the utility of PTH levels in predicting temporary postthyroidectomy hypocalcemia. Evidence Review: A systematic literature review of studies published prior to May 25, 2016 was performed within PubMed, EMBASE, SCOPUS, and Cochrane databases using the following terms and keywords: "thyroidectomy," "parathyroid hormone," and "hypocalcaemia," "calcium," or "calcitriol...
November 22, 2017: JAMA Surgery
https://www.readbyqxmd.com/read/29160302/role-of-cyp24a1-vdr-and-gc-gene-polymorphisms-on-deferasirox-pharmacokinetics-and-clinical-outcomes
#20
S Allegra, J Cusato, S De Francia, A Arduino, F Longo, E Pirro, D Massano, A De Nicolò, A Piga, A D'Avolio
β-Thalassemia patients develop deficiency in vitamin D absorption and liver hydroxylation, resulting in extremely low calcitriol levels. We explored the role of single-nucleotide polymorphisms (SNPs) involved in vitamin D metabolism, transport and activity on deferasirox pharmacokinetics and outcomes (effectiveness trough levels (Ctrough) and the area under the curve (AUC) cutoffs of 20 μg ml(-1) and 360 μg ml(-1) h(-1), respectively; nonresponse AUC limit of 250 μg ml(-1) h(-1)). Ninety-nine β-thalassemic patients were enrolled...
November 21, 2017: Pharmacogenomics Journal
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