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https://www.readbyqxmd.com/read/28728941/comparison-of-calcimimetic-r568-and-calcitriol-in-mineral-homeostasis-in-the-hyp-mouse-a-murine-homolog-of-x-linked-hypophosphatemia
#1
Maren Leifheit-Nestler, Julia Kucka, Emi Yoshizawa, Geert Behets, Patrick D'Haese, Christian Bergen, Martin Meier, Dagmar-Christiane Fischer, Dieter Haffner
X-linked hypophosphatemia (XLH) caused by mutations in the Phex gene is the most common human inherited phosphate wasting disorder characterized by enhanced synthesis of fibroblast growth factor 23 (FGF23) in bone, renal phosphate wasting, 1,25(OH)2D3 (1,25D) deficiency, rickets and osteomalacia. Here we studied the effects of calcimimetic R568 and calcitriol treatment in the Hyp mouse, a murine homolog of XLH. We hypothesized that mineral homeostasis is differentially affected by R568 and 1,25D with respect to the PTH-vitamin D-FGF23-Klotho axis and bone health...
July 18, 2017: Bone
https://www.readbyqxmd.com/read/28719612/renal-osteodystrophy-in-the-obesity-era-is-metabolic-syndrome-relevant
#2
Janaina Da Silva Martins, João Henrique Castro, Nestor A Sainz Rueda, Luciene Machado Dos Reis, Vanda Jorgetti, Rosa Maria Affonso Moysés, Jacqueline Teixeira Caramori
BACKGROUND: Observational studies have shown a beneficial effect of obesity on bone health; however, most of those studies were not based on bone biopsies. Metabolic syndrome (MetS) could have an effect on bone remodeling. However, there are no data on the effects of MetS in the presence of renal osteodystrophy. OBJECTIVE: The aim of this study was to investigate associations between MetS and renal osteodystrophy using the bone histomorphometric turnover-mineralization-volume (TMV) classification...
2017: PloS One
https://www.readbyqxmd.com/read/28718983/multimodality-image-guided-cryoablation-for-inoperable-tumor-induced-osteomalacia
#3
Sri Harsha Tella, Hayet Amalou, Bradford J Wood, Richard Chang, Clara C Chen, Cemre Robinson, Michelle Millwood, Guthrie Lori, Sheng Xu, Elliot Levy, Venkatesh Krishnasamy, Rachel I Gafni, Michael T Collins
Tumor-induced osteomalacia (TIO) is a debilitating paraneoplastic condition caused by small phosphaturic mesenchymal tumors (PMTs) that secrete large amounts of the phosphate- and vitamin D-regulating hormone, FGF23. Tumor removal results in cure. However, due to high perioperative comorbidity, either from tumor location or host factors, surgery is sometimes not an option. Tumor destruction via cryoablation may be an effective option for inoperable PMTs. Three subjects with a confirmed diagnosis of TIO were studied...
July 18, 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/28715994/fgf23-and-nutritional-metabolism
#4
Lindsay R Pool, Myles Wolf
The discovery of fibroblast growth factor 23 (FGF23) has provided a more complete understanding of the regulation of phosphate and mineral homeostasis in health and in chronic kidney disease. It has also offered new insights into stratification of risk of cardiovascular events and death among patients with chronic kidney disease and the general population. In this review, we provide an overview of FGF23 biology and physiology, summarize clinical outcomes that have been associated with FGF23, discuss potential mechanisms for these observations and their public health implications, and explore clinical and population health interventions that aim to reduce FGF23 levels and improve public health...
July 17, 2017: Annual Review of Nutrition
https://www.readbyqxmd.com/read/28713755/tumor-induced-osteomalacia-a-sherlock-holmes-approach-to-diagnosis-and-management
#5
G V Chanukya, Manoj Mengade, Jagadishwar Goud, I Satish Rao, Anuj Jain
Tumor-induced osteomalacia (TIO) is a subtype of paraneoplastic syndrome associated with hypophosphatemia due to renal phosphate wasting in adults. The humoral factor responsible for clinical picture known as fibroblast growth factor 23 (FGF23) is most often secreted by benign yet elusive mesenchymal tumors, difficult to localize, access, and excise completely; rarely, they are multiple and malignant. Paradoxical inappropriately normal or low levels of 1,25-dihydroxyvitamin D in the setting of hypophosphatemia is due to suppressive effect of FGF23...
January 2017: Annals of Maxillofacial Surgery
https://www.readbyqxmd.com/read/28706103/vitamin-d-levels-in-critically-ill-patients-with-acute-kidney-injury-a-protocol-for-a-prospective-cohort-study-vid-aki
#6
Lynda Katherine Cameron, Katie Lei, Samantha Smith, Nanci Leigh Doyle, James F Doyle, Kate Flynn, Nicola Purchase, John Smith, Kathryn Chan, Farida Kamara, Nardos Ghebremedhin Kidane, Lui G Forni, Dominic Harrington, Geeta Hampson, Marlies Ostermann
INTRODUCTION: Acute kidney injury (AKI) affects more than 50% of critically ill patients. The formation of calcitriol, the active vitamin D metabolite, from the main inactive circulating form, 25-hydroxyvitamin D (25(OH)D), occurs primarily in the proximal renal tubules. This results in a theoretical basis for reduction in levels of calcitriol over the course of an AKI. Vitamin D deficiency is highly prevalent in critically ill adults, and has been associated with increased rates of sepsis, longer hospital stays and increased mortality...
July 12, 2017: BMJ Open
https://www.readbyqxmd.com/read/28703220/tumour-induced-osteomalacia
#7
REVIEW
Salvatore Minisola, Munro Peacock, Seijii Fukumoto, Cristiana Cipriani, Jessica Pepe, Sri Harsha Tella, Michael T Collins
Tumour-induced osteomalacia (TIO), also known as oncogenic osteomalacia, is a rare paraneoplastic disorder caused by tumours that secrete fibroblast growth factor 23 (FGF23). Owing to the role of FGF23 in renal phosphate handling and vitamin D synthesis, TIO is characterized by decreased renal tubular reabsorption of phosphate, by hypophosphataemia and by low levels of active vitamin D. Chronic hypophosphataemia ultimately results in osteomalacia (that is, inadequate bone mineralization). The diagnosis of TIO is usually suspected when serum phosphate levels are chronically low in the setting of bone pain, fragility fractures and muscle weakness...
July 13, 2017: Nature Reviews. Disease Primers
https://www.readbyqxmd.com/read/28701671/is-serum-uric-acid-independently-associated-with-left-ventricular-mass-index-ejection-fraction-and-b-type-natriuretic-peptide-among-female-and-male-cardiac-patients
#8
Yohei Yamauchi, Shu-Ichi Fujita, Kensaku Shibata, Hideaki Morita, Takahide Ito, Koichi Sohmiya, Masaaki Hoshiga, Nobukazu Ishizaka
Mean serum uric acid (SUA) levels are higher in men than women. In addition, recent studies have suggested that the SUA threshold at which the cardiovascular risk might increase may vary between women and men. In the current retrospective study, by analyzing the data from 219 female and 519 male patients who were free from uric acid-lowering medication, we investigated whether SUA is associated with left ventricular mass index (LVMI), left ventricular ejection fraction (LVEF), and plasma levels of B-type natriuretic peptide (BNP) independent of confounding factors, such as serum calcium, inorganic phosphate, and fibroblast growth factor 23 (FGF23), in a gender-specific manner...
July 13, 2017: International Heart Journal
https://www.readbyqxmd.com/read/28699886/interleukin-1-inhibition-chronic-kidney-disease-mineral-and-bone-disorder-and-physical-function%C3%A2
#9
Kristen L Nowak, Adriana Hung, Talat Alp Ikizler, Heather Farmer-Bailey, Natjalie Salas-Cruz, Sudipa Sarkar, Andrew Hoofnagle, Zhiying You, Michel Chonchol
OBJECTIVE: Epidemiologic studies have suggested a link between chronic systemic inflammation and chronic kidney disease-mineral and bone disorder (CKD-MBD). Additionally, declining renal function is associated with worsening physical and cognitive function, which may potentially be explained by systemic inflammation, CKD-MBD, or both. We hypothesized that inhibiting inflammation with an interleukin-1 (IL-1) trap would improve markers of CKD-MBD as well as physical/cognitive function in patients with moderate-to-severe CKD...
July 12, 2017: Clinical Nephrology
https://www.readbyqxmd.com/read/28694529/the-production-of-fibroblast-growth-factor-23-is-controlled-by-tgf-%C3%AE-2
#10
Martina Feger, Philipp Hase, Bingbing Zhang, Frank Hirche, Philipp Glosse, Florian Lang, Michael Föller
Transforming growth factor-β (TGF-β) is a cytokine produced by many cell types and implicated in cell growth, differentiation, apoptosis, and inflammation. It stimulates store-operated calcium entry (SOCE) through the calcium release-activated calcium (CRAC) channel Orai1/Stim1 in endometrial Ishikawa cells. Bone cells generate fibroblast growth factor (FGF) 23, which inhibits renal phosphate reabsorption and 1,25(OH)2D3 formation in concert with its co-receptor Klotho. Moreover, Klotho and FGF23 counteract aging and age-related clinical conditions...
July 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28684064/protective-role-of-vitamin-e-preconditioning-of-human-dermal-fibroblasts-against-thermal-stress-in-vitro
#11
Hira Butt, Azra Mehmood, Muhammad Ali, Saba Tasneem, Muhammad Sohail Anjum, Moazzam N Tarar, Shaheen N Khan, Sheikh Riazuddin
AIMS: Oxidative microenvironment of burnt skin restricts the outcome of cell based therapies of thermal skin injuries. The aim of this study was to precondition human dermal fibroblasts with an antioxidant such as vitamin E to improve their survival and therapeutic abilities in heat induced oxidative in vitro environment. MAIN METHODS: Fibroblasts were treated with 100μM vitamin E for 24h at 37°C followed by heat shock for 10min at 51°C in fresh serum free medium...
July 3, 2017: Life Sciences
https://www.readbyqxmd.com/read/28677090/klotho-levels-association-with-insulin-resistance-and-albumin-to-creatinine-ratio-in-type-2-diabetic-patients
#12
Ana Paula Silva, Filipa Mendes, Luísa Pereira, André Fragoso, Rui Baptista Gonçalves, Nélio Santos, Fátima Rato, Pedro Leão Neves
PURPOSE: The present study aimed at evaluating the relationship between Klotho levels and insulin resistance and albumin-to-creatinine ratio (ACR) in type 2 diabetic patients with CKD. METHODS: We conducted an observational, cross-sectional study in our outpatient diabetic nephropathy clinic from 2014 to 2016, enrolling a total of 107 type 2 diabetic patients with stage 2-3 CKD, with a mean age of 59 years. Several clinical and laboratorial parameters were evaluated, including those related to mineral and carbohydrate metabolism...
July 4, 2017: International Urology and Nephrology
https://www.readbyqxmd.com/read/28674323/newly-developed-rat-model-of-chronic-kidney-disease-mineral-bone-disorder
#13
Kentaro Watanabe, Hideki Fujii, Shunsuke Goto, Kentaro Nakai, Keiji Kono, Shuhei Watanabe, Masami Shinohara, Shinichi Nishi
AIM: Chronic kidney disease-mineral bone disorder (CKD-MBD) is associated with all-cause and cardiovascular morbidity and mortality in patients with CKD. Thus, elucidating its pathophysiological mechanisms is essential for improving the prognosis. We evaluated characteristics of CKD-MBD in a newly developed CKD rat model. METHODS: We used male Sprague-Dawley (SD) rats and spontaneously diabetic Torii (SDT) rats, which are used as models for nonobese type 2 diabetes...
July 1, 2017: Journal of Atherosclerosis and Thrombosis
https://www.readbyqxmd.com/read/28667925/serum-fibroblast-growth-factor-23-concentrations-in-dogs-with-chronic-kidney-disease
#14
Keren E Dittmer, Kalyani C Perera, Peter A Elder
The aim of this study was to determine if serum fibroblast growth factor (FGF23) concentrations were increased in dogs with chronic kidney disease (CKD). Serum samples submitted to a commercial laboratory were collected over a 15-month period, 14 samples were from dogs with a history of polyuria/polydipsia, azotaemia and low urine specific gravity, 20 samples were from non-azotaemic dogs. Serum FGF23, parathyroid hormone, total calcium and phosphorus, urea and creatinine were measured. Mann-Whitney test was used to determine differences between non-azotaemic and CKD groups; a one-way ANOVA with Tukey pairwise comparisons was used to determine any differences between International Renal Interest Society stages; and regression models were used to determine predictors of International Renal Interest Society stage, serum phosphorus and FGF23 concentrations...
June 23, 2017: Research in Veterinary Science
https://www.readbyqxmd.com/read/28667458/variability-in-measures-of-mineral-metabolism-in-children-on-hemodialysis-impact-on-clinical-decision-making
#15
Aadil Kakajiwala, Thomas O Jemielita, Lawrence Copelovitch, Mary B Leonard, Susan L Furth, Amy York, Maryjane Benton, Andrew N Hoofnagle, Kimberly Windt, Karen Merrigan, April Lederman, Michelle R Denburg
BACKGROUND: Variability in measures of mineral metabolism has not been studied in pediatric end stage kidney disease. We sought to determine the intra-individual variability in measures of mineral metabolism in children on hemodialysis (HD) and its impact on clinical decision-making. METHODS: We conducted a prospective single-center study of children (3.6-17.3 years old) on chronic HD. Serial twice weekly measures of serum calcium, phosphate and intact parathyroid hormone (PTH), as well as weekly measures of fibroblast growth factor 23 (FGF23) and vitamin D metabolites, were obtained over a 12-week period in 10 children...
June 30, 2017: Pediatric Nephrology: Journal of the International Pediatric Nephrology Association
https://www.readbyqxmd.com/read/28659167/deviations-from-the-expected-relationship-between-serum-fgf23-and-other-markers-in-children-with-ckd-a-cross-sectional-study
#16
Daisy Liu, Ana Catalina Alvarez-Elías, Brooke Wile, Vladimir Belostotsky, Guido Filler
BACKGROUND: High levels of fibroblast growth factor-23 (FGF23) are associated with mortality. In chronic kidney disease (CKD), FGF23 levels rise as renal function declines. We analyzed the contribution of laboratory values to the variance of FGF23 levels in relationship to a curve of expected FGF23 levels for a given GFR. METHODS: Following approval by the research ethics boards, we measured FGF23, CysC eGFR, creatinine, urea, albumin, calcium, phosphate, vitamin D metabolites, PTH, alkaline phosphatase, CRP, and venous gases in 141 pediatric CKD patients (45, 37, 32, 13 and 14 CKD stages I, II, III, IV, and V, respectively)...
June 28, 2017: BMC Nephrology
https://www.readbyqxmd.com/read/28651327/alpha-klotho-and-fibroblast-growth-factor-23-among-alcoholics
#17
Geraldine Quintero-Platt, Emilio González-Reimers, Melchor Rodríguez-Gaspar, Candelaria Martín-González, Onán Pérez-Hernández, Lucía Romero-Acevedo, Elisa Espelosín-Ortega, María José de la Vega-Prieto, Francisco Santolaria-Fernández
Aims: Alcoholism may be a cardiovascular risk factor. Osteocyte derived molecules such as fibroblast growth factor 23 (FGF-23) and soluble α Klotho have recently been associated with cardiovascular disease, but their role in alcoholics is unknown. We here analyze the behavior of FGF23 and α Klotho in alcoholics. Methods: Ninety-seven alcoholic patients were assessed for liver function, presence of hypertension, diabetes, atrial fibrillation, left ventricular hypertrophy (LVH), vascular calcifications (assessed by chest X-ray) and nutritional status (lean and fat mass measured by densitometry)...
June 23, 2017: Alcohol and Alcoholism: International Journal of the Medical Council on Alcoholism
https://www.readbyqxmd.com/read/28645356/-endocrine-control-of-serum-phosphate-from-the-discoveries-of-phosphatonins-to-novel-therapies
#18
A Linglart, C Chaussain
Phosphate is absorbed through the gut, stored in the bone and reabsorbed through the proximal renal tubule. More importantly, PTH and FGF23 have been identified as the main phosphaturic factors that control the expression of the phosphate co-transporters NaPi-IIa et IIc. By allowing the adjustment of the urinary phosphate reabsorption, these two phosphatonins play a major role in bone and tooth mineralization and growth. Recently, novel therapies have successfully targeted the FGF23 signaling pathway to treat the hypophosphatemia in patients affected with molecular defects of this pathway (mutations in the PHEX gene)...
October 2016: Annales D'endocrinologie
https://www.readbyqxmd.com/read/28630637/evaluation-of-circulating-srage-in-osteoporosis-according-to-bmi-adipokines-and-fracture-risk-a-pilot-observational-study
#19
Emanuela Galliera, Monica Gioia Marazzi, Carmine Gazzaruso, Pietro Gallotti, Adriana Coppola, Tiziana Montalcini, Arturo Pujia, Massimiliano M Corsi Romanelli
BACKGROUND: Osteoporosis is a systemic metabolic disease based on age-dependent imbalance between the rates of bone formation and bone resorption. Recent studies on the pathogenesis of this disease identified that bone remodelling impairment, at the base of osteoporotic bone fragility, could be related to protein glycation, in association to oxidative stress. The glycation reactions lead to the generation of glycation end products (AGEs) which, in turn, accumulates into bone, where they binds to the receptor for AGE (RAGE)...
2017: Immunity & Ageing: I & A
https://www.readbyqxmd.com/read/28630081/calcium-sensing-receptor-genotype-and-response-to-cinacalcet-in-patients-undergoing-hemodialysis
#20
Sharon M Moe, Leah Wetherill, Brian Scott Decker, Dongbing Lai, Safa Abdalla, Jin Long, Matteo Vatta, Tatiana M Foroud, Glenn M Chertow
BACKGROUND AND OBJECTIVES: We tested the hypothesis that single nucleotide polymorphisms (SNPs) in the calcium-sensing receptor (CASR) alter the response to the calcimimetic cinacalcet. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS: We analyzed DNA samples in the Evaluation of Cinacalcet HCl Therapy to Lower Cardiovascular Events (EVOLVE) trial, a randomized trial comparing cinacalcet to placebo on a background of usual care. Of the 3883 patients randomized, 1919 (49%) consented to DNA collection, and samples from 1852 participants were genotyped for 18 CASR polymorphisms...
June 19, 2017: Clinical Journal of the American Society of Nephrology: CJASN
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