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https://www.readbyqxmd.com/read/29782822/simultaneous-determination-of-intestinal-permeability-and-potential-drug-interactions-of-complex-mixtures-using-caco-2-cells-and-high-resolution-mass-spectrometry-studies-with-rauwolfia-serpentina-extract
#1
Thomas J Flynn, Sanah N Vohra
Caco-2 cells are a commonly used model for estimating the intestinal bioavailability of single chemical entity pharmaceuticals. Caco-2 cells, when induced with calcitriol, also express other biological functions such as phase I (CYP) and phase II (glucuronosyltransferases) drug metabolizing enzymes which are relevant to drug-supplement interactions. Intestinal bioavailability is an important factor in the overall safety assessment of products consumed orally. Foods, including herbal dietary supplements, are complex substances with multiple chemical components...
May 18, 2018: Chemico-biological Interactions
https://www.readbyqxmd.com/read/29779025/differential-determinants-of-tubular-phosphate-reabsorption-insights-on-renal-excretion-of-phosphates-in-kidney-disease
#2
Nahid Tabibzadeh, Romuald Mentaverri, Maïté Daroux, Rafik Mesbah, Alexia Delpierre, Jean-Gabriel Paul, Valérie Deken, Ziad A Massy, Pierre Bataille
We assessed the tubular reabsorption of phosphate (TRP) and maximal renal threshold for phosphate reabsorption to glomerular filtration rate (TmPi/GFR) and their determinants in 64 stages 2-4 chronic kidney disease (CKD) patients in order to define the early changes in phosphate metabolism in CKD. In multivariable analysis, TmPi/GFR correlates were estimated GFR (eGFR), intact parathyroid hormone (iPTH), and hemoglobin (R2 = 0.417), while TRP correlates were eGFR, iPTH, 24-h phosphaturia, and calcitriol (R2 = 0...
May 18, 2018: American Journal of Nephrology
https://www.readbyqxmd.com/read/29776409/calcitriol-downregulates-fibroblast-growth-factor-receptor-1-through-histone-deacetylase-activation-in-hl-1-atrial-myocytes
#3
Ting-Wei Lee, Ting-I Lee, Yung-Kuo Lin, Yu-Hsun Kao, Yi-Jen Chen
BACKGROUND: Fibroblast growth factor (FGF)-2 plays a crucial role in the pathophysiology of cardiovascular diseases (CVDs). FGF-2 was reported to induce cardiac hypertrophy through activation of FGF receptor 1 (FGFR1). Multiple laboratory findings indicate that calcitriol may be a potential treatment for CVDs. In this study, we attempted to investigate whether calcitriol regulates FGFR1 expression to modulate the effects of FGF-2 signaling in cardiac myocytes and explored the potential regulatory mechanism...
May 18, 2018: Journal of Biomedical Science
https://www.readbyqxmd.com/read/29773507/the-value-and-significance-of-25-oh-and-1-25-oh-vitamin-d-serum-levels-in-adult-coeliac-patients-a-review-of-the-literature
#4
REVIEW
Fabiana Zingone, Carolina Ciacci
Within the wide spectrum of symptoms and alteration of systems that characterizes CeD, several studies indicate a low-level of vitamin D, therefore recent guidelines suggest its evaluation at the time of diagnosis. This review examines the data from existing studies in which vitamin D has been assessed in CeD patients. Our review indicates that most of the studies on vitamin D in adult CeD report a 25 (OH) vitamin D deficiency at diagnosis that disappears when the patient goes on a gluten-free diet, independently of any supplementation...
April 13, 2018: Digestive and Liver Disease
https://www.readbyqxmd.com/read/29769119/adefovir-dipivoxil-induced-hypophosphatemic-osteomalacia-in-chronic-hepatitis-b-a-comparative-study-of-chinese-and-foreign-case-series
#5
Nan Chen, Jian-Bo Zhang, Qiujie Zhang, Yun-Peng Zhao, Li-Yan Li, Li-Wei Liu, Fei Yu, Xin Yu, Tao Peng, Kuan-Xiao Tang
BACKGROUND: Adefovir dipivoxil (ADV)-induced renal tubular dysfunction and hypophosphatemic osteomalacia (HO) have been given great consideration in the past few years. However, no standard guidance is available due to a lack of powerful evidence from appropriate long-term prospective case-control studies and variations in the definition of renal adverse events. The aim of this study is to clarify clinical features of ADV-related HO in Chinese chronic hepatitis B patients with long-term ADV treatment in Chinese and non-Chinese comparative case series...
May 16, 2018: BMC Pharmacology & Toxicology
https://www.readbyqxmd.com/read/29762856/vitamin-d-a-steroid-hormone-with-progesterone-like-activity
#6
G Monastra, S De Grazia, L De Luca, S Vittorio, V Unfer
OBJECTIVE: This review is aimed at demonstrating the progesterone-like activity exerted by the active form of vitamin D, or calcitriol (1,25(OH)2D). To achieve this outcome, we compared the effects in vivo and in vitro exerted by progesterone and vitamin D, with a special focus on the female reproductive system and pregnancy. MATERIALS AND METHODS: This is a literature review of the most important articles published in English on vitamin D as a hormone, mainly found by MEDLINE...
April 2018: European Review for Medical and Pharmacological Sciences
https://www.readbyqxmd.com/read/29760049/insulin-suppresses-the-production-of-fibroblast-growth-factor-23-fgf23
#7
Ludmilla Bär, Martina Feger, Abul Fajol, Lars-Oliver Klotz, Shufei Zeng, Florian Lang, Berthold Hocher, Michael Föller
Fibroblast growth factor 23 (FGF23) is produced by bone cells and regulates renal phosphate and vitamin D metabolism, as well as causing left ventricular hypertrophy. FGF23 deficiency results in rapid aging, whereas high plasma FGF23 levels are found in several disorders, including kidney or cardiovascular diseases. Regulators of FGF23 production include parathyroid hormone (PTH), calcitriol, dietary phosphate, and inflammation. We report that insulin and insulin-like growth factor 1 (IGF1) are negative regulators of FGF23 production...
May 14, 2018: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/29753400/updates-on-the-mechanisms-and-the-care-of-cardiovascular-calcification-in-chronic-kidney-disease
#8
REVIEW
Lucie Hénaut, Jean-Marc Chillon, Saïd Kamel, Ziad A Massy
In chronic kidney disease (CKD), the progressive decrease in renal function leads to disturbances of mineral metabolism that generally cause secondary hyperparathyroidism. The increase in serum parathyroid hormone is associated with reduced serum calcium and calcitriol levels and/or increased serum fibroblast growth factor-23 and phosphate levels. The resulting CKD-associated disorder of mineral and bone metabolism is associated with various other metabolic dysregulations such as acidosis, malnutrition, inflammation, and accumulation of uremic toxins...
May 2018: Seminars in Nephrology
https://www.readbyqxmd.com/read/29748075/protective-effect-of-calcitriol-on-podocytes-in-spontaneously-hypertensive-rat
#9
Weiwei Shi, Ling Guo, Guangyi Liu, Tao Peng, Hongyu Li, Tingting Xie, Dengren Li, Junhui Zhen, Yan Wang, Huimin Yang, Xiangdong Yang
BACKGROUND: Hypertension is a major global public health issue. Uncontrolled hypertension leads to organ damage, especially renal damage. Calcitriol is used to treat osteoporosis, promote bone formation, and increase bone mass. Previous studies have demonstrated that 1,25(OH)2D3, in addition to its classic role, also has multiple immune regulation and renoprotective functions and inhibits the activity of the renin-angiotensin-aldosterone system (RASS). The aim of the current study was to investigate the renoprotective effects of calcitriol in a spontaneously hypertensive rat (SHR) model...
May 7, 2018: Journal of the Chinese Medical Association: JCMA
https://www.readbyqxmd.com/read/29741700/modulation-of-renal-ca-and-pi-transporting-proteins-by-dietary-nitrogen-and-or-calcium-in-young-goats
#10
C S Firmenich, K Elfers, M R Wilkens, G Breves, A S Muscher-Banse
In young goats, a reduction in dietary nitrogen (N) had an impact on mineral homeostasis although ruminants are able to recycle N effectively due to rumino-hepatic circulation. A solitary calcium (Ca) reduction stimulated calcitriol synthesis and Ca concentrations remained unchanged, whereas a dietary N reduction led to a decrease in calcitriol which could not be prevented by a simultaneous reduction of N and Ca. In a previous study, it was shown that a reduced dietary N intake caused a decrease in intestinal Ca absorption due to a reduction of intestinal Ca transporting proteins...
May 8, 2018: Journal of Animal Science
https://www.readbyqxmd.com/read/29732934/no-association-between-the-vitamin-d-pathway-gene-polymorphisms-and-bone-biomarkers-response-to-calcium-and-low-dose-calcitriol-supplementation-in-postmenopausal-chinese-women-a-one-year-prospective-study
#11
Jiemei Gu, Chun Wang, Hao Zhang, Hue Yue, Weiwei Hu, Jinwei He, Wenzhen Fu, Zhenlin Zhang
INTRODUCTION: The aim of the study was to explore the association between the Vitamin D pathway gene variations and the bone biomarkers response to calcium and low dose calcitriol supplementation in postmenopausal Chinese women. METHODS: A total of 110 healthy postmenopausal Chinese women (61.51±6.93 years) were enrolled. The participants were supplemented with calcium (600 mg/d) and calcitriol (0.25 μg/d), for 1 year. Four biomarkers, serum levels of beta C-terminal cross-linked telopeptides of type I collagen (β-CTX), amino-terminal propeptide of type I collagen (P1NP), parathyroid hormone (PTH) and 25-hydroxyvitamin D [25(OH)D] were measured at baseline and 12-month follow-up...
May 7, 2018: Biomarkers: Biochemical Indicators of Exposure, Response, and Susceptibility to Chemicals
https://www.readbyqxmd.com/read/29717985/-calcitriol-induced-hypercalcemia-in-a-hunting-dog-with-a-disseminated-paecilomyces-variotii-infection
#12
C Weingart, J Raila, A Lübke-Becker, O Kershaw, M Brunnberg, B Kohn
A 5-year old hunting dog was presented with reduced appetite, weight loss and polyuria/polydipsia. Hematology and clinical chemistry revealed anemia, leukocytosis, increased liver enzymes, hypoalbuminemia and hypercalcemia. The cytological, pathohistological and microbiological examination identified a disseminated infection with the saprophytic mould fungus Paecilomyces variotii in the biopsies of the spleen and a lymph node. Determination of vitamin D metabolites confirmed a calcitriol induced hypercalcemia...
May 2018: Schweizer Archiv Für Tierheilkunde
https://www.readbyqxmd.com/read/29710140/interventions-to-prevent-falls-in-older-adults-updated-evidence-report-and-systematic-review-for-the-us-preventive-services-task-force
#13
REVIEW
Janelle M Guirguis-Blake, Yvonne L Michael, Leslie A Perdue, Erin L Coppola, Tracy L Beil
Importance: Falls are the most common cause of injury-related morbidity and mortality among older adults. Objective: To systematically review literature on the effectiveness and harms of fall prevention interventions in community-dwelling older adults to inform the US Preventive Services Task Force. Data Sources: MEDLINE, PubMed, Cumulative Index for Nursing and Allied Health Literature, and Cochrane Central Register of Controlled Trials for relevant English-language literature published through August 2016, with ongoing surveillance through February 7, 2018...
April 24, 2018: JAMA: the Journal of the American Medical Association
https://www.readbyqxmd.com/read/29696242/fibroblast-growth-factor-23-induced-hypophosphatemia-in-acute-leukemia
#14
Rachel B Reinert, Dale Bixby, Ronald J Koenig
Fibroblast growth factor 23 (FGF23)-induced hypophosphatemia is a rare paraneoplastic syndrome of phosphate wasting that, if unrecognized, may cause tumor-induced osteomalacia. It is classically associated with benign mesenchymal tumors but occasionally has been found in patients with other malignancies. Hypophosphatemia has been associated with acute leukemia but has not previously been reported to be due to inappropriate FGF23 secretion. Here, we describe FGF23-induced severe hypophosphatemia and renal phosphate wasting associated with a mixed-phenotype Philadelphia chromosome-like acute leukemia in a previously healthy 22-year-old man...
May 1, 2018: Journal of the Endocrine Society
https://www.readbyqxmd.com/read/29684027/chronic-calcitriol-supplementation-improves-the-inflammatory-profiles-of-circulating-monocytes-and-the-associated-intestinal-adipose-tissue-alteration-in-a-diet-induced-steatohepatitis-rat-model
#15
Yen-Bo Su, Tzu-Hao Li, Chia-Chang Huang, Hung-Cheng Tsai, Shiang-Fen Huang, Yun-Cheng Hsieh, Ying-Ying Yang, Yi-Hsiang Huang, Ming-Chih Hou, Han-Chieh Lin
Vitamin D deficiency and up-regulated TNFα-related signals are reported to be involved in abnormalities including intestinal hyper-permeability, bacterial translocation, systemic/portal endotoxemia, intestinal/adipose tissue/hepatic inflammation, and hepatic steatosis in nonalcoholic steatohepatitis (NASH). This study aims to explore the molecular mechanisms and effects of chronic calcitriol [1,25-(OH)2D3, hormonal form of vitamin D] on gut-adipose tissue-liver axis abnormalities using a high-fat diet (HFD)-fed rat model of NASH...
2018: PloS One
https://www.readbyqxmd.com/read/29666919/prevalence-of-vitamin-d-insufficiency-and-evidence-for-disease-prevention-in-the-older-population
#16
REVIEW
Julia Kühn, Paula Trotz, Gabriele I Stangl
The prevalence of vitamin D insufficiency, usually assessed by the analysis of circulating 25-hydroxyvitamin D (25[OH])D), is very high in the aging German population. An important factor that reduces endogenous vitamin D synthesis in older persons is physical inactivity or care-dependency that limits the time spent outside. Additionally, it has been suggested that the age-dependent decline in the glomerular filtration rate is associated with a reduced production of bioactive calcitriol. As this phenomenon is not detectable by the assessment of 25(OH)D, it is necessary to analyze the level of parathyroid hormone as a marker of calcitriol function...
April 17, 2018: Zeitschrift Für Gerontologie und Geriatrie
https://www.readbyqxmd.com/read/29665833/intervention-using-vitamin-d-for-elevated-urinary-albumin-in-type-2-diabetes-mellitus-ideal-2-study-study-protocol-for-a-randomised-controlled-trial
#17
Shahrad Taheri, Muhammad Asim, Hassan Al Malki, Omar Fituri, Manikkam Suthanthiran, Phyllis August
BACKGROUND: The prevalence of type 2 diabetes mellitus (T2DM) is increasing worldwide. T2DM is associated with serious macro- and microvascular complications. In particular, diabetic kidney disease (DKD), which begins with excessive urinary albumin excretion, has a significant impact on affected individuals and is costly to healthcare services. Inhibition of the renin-angiotensin-aldosterone system (RAAS) with angiotensin converting enzyme inhibitors (ACEI) or angiotensin receptor blockers (ARB) significantly reduces albuminuria in diabetes, but this effect is not observed in all those treated...
April 17, 2018: Trials
https://www.readbyqxmd.com/read/29661746/effects-of-oral-vitamin-d-3-supplementation-in-stage-3-chronic-kidney-disease-subjects-insulin-resistance-syndrome-and-hormonal-disturb-interactions
#18
Amina Tahar, Faiza Zerdoumi, Messaoud Saidani, Lakhdar Griene, Elhadj-Ahmed Koceir
The 1-25-hydroxyvitamine D (1-25OHD) or calcitriol deficiency in chronic kidney disease (CKD) patients was associated with increases vascular calcification risk, nephrons reduction, bone deficit and cardiovascular mortality by atherosclerosis. The objective of this study was to investigate the pleiotropic effects of 200.000 IU (D200 group) every 3 months versus 30.000 IU (D30 group) every month dose vitamin D supplementation in stage 3 CKD patients. A cohort of 132 adult subjects was randomized into 2 groups according to dose vitamin D supplementation in deficient subjects (25OHD <50 nmol/L or <20 ng/mL)...
April 16, 2018: Annales de Biologie Clinique
https://www.readbyqxmd.com/read/29657326/exploring-vitamin-d-metabolism-and-function-in-cancer
#19
REVIEW
Sang-Min Jeon, Eun-Ae Shin
Vitamin D, traditionally known as an essential nutrient, is a precursor of a potent steroid hormone that regulates a broad spectrum of physiological processes. In addition to its classical roles in bone metabolism, epidemiological, preclinical, and cellular research during the last decades, it revealed that vitamin D may play a key role in the prevention and treatment of many extra-skeletal diseases such as cancer. Vitamin D, as a prohormone, undergoes two-step metabolism in liver and kidney to produce a biologically active metabolite, calcitriol, which binds to the vitamin D receptor (VDR) for the regulation of expression of diverse genes...
April 16, 2018: Experimental & Molecular Medicine
https://www.readbyqxmd.com/read/29644071/clinical-management-of-patients-on-peritoneal-dialysis-in-italy-results-from-the-atena-study
#20
Carlo Crepaldi, Alessandro Possidoni, Flavia Caputo, Roberto Dell'Aquila, Emilio Giulio Galli, Anna Maria Costanzo, Giuliana Gualberti, Umberto di Luzio Paparatti, Roberto Russo
Background: In Italy, few studies have examined the clinical management of peritoneal dialysis (PD) patients, resulting in a lack of information and awareness. Methods: A total of 378 PD patients (64.7 ± 14.3 years, 58.9% males) were enrolled across 15 centres in a 12-month retrospective and 6-month prospective study. The primary objective was to evaluate the achievement of Kidney Disease Outcomes Quality Initiative and Kidney Disease Improving Global Outcomes guidelines on recommended target values for anaemia, high blood pressure and mineral metabolism...
April 2018: Clinical Kidney Journal
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