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https://www.readbyqxmd.com/read/28102095/significance-of-the-ionized-calcium-measurement-to-assess-calcium-status-in-osteopenic-osteoporosis-postmenopausal-outpatients
#1
Letizia Guiducci, Silvia Maffei, Laura Sabatino, Luc Zyw, Debora Battaglia, Alessandro Vannucci, Pietro Di Cecco, Cristina Vassalle
INTRODUCTION: Evaluation of calcium status is important in the osteoporotic risk assessment. Although guidelines indicate total calcium (tCa) as first-line measurement, directly measured ionized calcium (m-iCa), considered as the gold standard, is more and more often required. Aim of this study is to evaluate the agreement between m-iCa, tCa and iCa calculated from a formula based on total calcium and albumin (c-iCa) in osteopenic/osteoporotic postmenopausal outpatients. METHODS: A total of 140 postmenopausal outpatients, 41 osteopenic (OPN) and 99 osteoporotic (OP) were enrolled...
January 19, 2017: Gynecological Endocrinology
https://www.readbyqxmd.com/read/28101619/-all-rounder-vitamin%C3%A2-d
#2
S Unholzer, A Rothmund, E Haen
BACKGROUND: Many indications are discussed for vitamin D substitution, such as osteoporosis, autoimmune diseases, cancer and psychiatric diseases. Also discussed is the fact that the majority of the German population suffer from a vitamin D deficiency. OBJECTIVE: Review of the study results for these individual diseases and a critical analysis of the currently established therapeutic reference range, which defines a vitamin D deficiency. MATERIAL AND METHODS: A literature search was carried out in the statements of the German Society for Nutrition, in scientific publications and journals...
January 18, 2017: Der Nervenarzt
https://www.readbyqxmd.com/read/28099849/cyclic-amp-recruits-a-discrete-intracellular-ca-2-store-by-unmasking-hypersensitive-ip3-receptors
#3
Vera Konieczny, Stephen C Tovey, Stefania Mataragka, David L Prole, Colin W Taylor
Inositol 1,4,5-trisphosphate (IP3) stimulates Ca(2+) release from the endoplasmic reticulum (ER), and the response is potentiated by 3',5'-cyclic AMP (cAMP). We investigated this interaction in HEK293 cells using carbachol and parathyroid hormone (PTH) to stimulate formation of IP3 and cAMP, respectively. PTH alone had no effect on the cytosolic Ca(2+) concentration, but it potentiated the Ca(2+) signals evoked by carbachol. Surprisingly, however, the intracellular Ca(2+) stores that respond to carbachol alone could be both emptied and refilled without affecting the subsequent response to PTH...
January 17, 2017: Cell Reports
https://www.readbyqxmd.com/read/28099363/different-ret-gene-mutation-induced-multiple-endocrine-neoplasia-type-2a-in-3-chinese-families
#4
Qiuli Liu, Dali Tong, Wenqiang Yuan, Gaolei Liu, Gang Yuan, Weihua Lan, Dianzheng Zhang, Jun Zhang, Zaoming Huang, Yao Zhang, Jun Jiang
BACKGROUD: Multiple endocrine neoplasia type 2A (MEN2A) is a condition with inherited autosomal dominant mutations in RET (rearranged during transfection) gene that predisposes the carrier to extremely high risk of medullary thyroid cancer (MTC) and other MEN2A-associated tumors such as parathyroid cancer and/or pheochromocytoma. Little is reported about MEN2A syndrome in the Chinese population. METHODS: All members of the 3 families along with specific probands of MEN2A were analyzed for their clinical, laboratory, and genetic characteristics...
January 2017: Medicine (Baltimore)
https://www.readbyqxmd.com/read/28099122/parathormone-stability-in-hemodialyzed-patients-and-healthy-subjects-comparison-on-non-centrifuged-edta-and-serum-samples-with-second-and-third-generation-assays
#5
Marie-Louise Schleck, Jean-Claude Souberbielle, Pierre Delanaye, Mario Plebani, Etienne Cavalier
BACKGROUND: Parathyroid hormone (PTH) stability is important. Many studies have shown divergent results between EDTA and serum, which are mainly linked to differences in protocols or cut-offs used to determine whether or not PTH remained stable. No studies have yet compared PTH stability as measured by second- and third-generation assays on the same samples in hemodialyzed patients and healthy subjects. METHODS: Five pairs of samples (EDTA and gel tubes) were obtained in 10 hemodialyzed patients before a dialysis session and in 10 healthy subjects...
January 18, 2017: Clinical Chemistry and Laboratory Medicine: CCLM
https://www.readbyqxmd.com/read/28098103/relation-of-fibroblast-growth-factor-23-and-cardiovascular-calcification-in-end-stage-kidney-disease-patients-on-regular-hemodialysis
#6
Tarek Zakaria El Baz, Osama Ahmed Khamis, Osama Ashry Ahmed Gheith, Salama Saad Abd Ellateif, Abdallah Mahmoud Abdallah, Hussein Chahine Abd El Aal
More than half of deaths in end-stage kidney disease (ESKD) patients are due to cardiovascular disease. Elevated fibroblast growth factor 23 (FGF-23) was found to be associated with mortality in hemodialysis (HD) patients and correlates with peripheral calcification. Aortic calcification is associated with coronary artery calcification. Both aortic and peripheral vascular calcifications were associated with mortality in chronic kidney disease. We aimed to investigate the relation between intact FGF-23 and cardiovascular calcification in patients with ESKD who were maintained on regular HD...
January 2017: Saudi Journal of Kidney Diseases and Transplantation
https://www.readbyqxmd.com/read/28097356/effect-of-etelcalcetide-vs-cinacalcet-on-serum-parathyroid-hormone-in-patients-receiving-hemodialysis-with-secondary-hyperparathyroidism-a-randomized-clinical-trial
#7
Geoffrey A Block, David A Bushinsky, Sunfa Cheng, John Cunningham, Bastian Dehmel, Tilman B Drueke, Markus Ketteler, Reshma Kewalramani, Kevin J Martin, Sharon M Moe, Uptal D Patel, Justin Silver, Yan Sun, Hao Wang, Glenn M Chertow
Importance: Secondary hyperparathyroidism contributes to extraskeletal calcification and is associated with all-cause and cardiovascular mortality. Control is suboptimal in the majority of patients receiving hemodialysis. An intravenously (IV) administered calcimimetic could improve adherence and reduce adverse gastrointestinal effects. Objective: To evaluate the relative efficacy and safety of the IV calcimimetic etelcalcetide and the oral calcimimetic cinacalcet...
January 10, 2017: JAMA: the Journal of the American Medical Association
https://www.readbyqxmd.com/read/28097355/effect-of-etelcalcetide-vs-placebo-on-serum-parathyroid-hormone-in-patients-receiving-hemodialysis-with-secondary-hyperparathyroidism-two-randomized-clinical-trials
#8
Geoffrey A Block, David A Bushinsky, John Cunningham, Tilman B Drueke, Markus Ketteler, Reshma Kewalramani, Kevin J Martin, T Christian Mix, Sharon M Moe, Uptal D Patel, Justin Silver, David M Spiegel, Lulu Sterling, Liron Walsh, Glenn M Chertow
Importance: Secondary hyperparathyroidism contributes to extraskeletal complications in chronic kidney disease. Objective: To evaluate the effect of the intravenous calcimimetic etelcalcetide on serum parathyroid hormone (PTH) concentrations in patients receiving hemodialysis. Design, Setting, and Participants: Two parallel, phase 3, randomized, placebo-controlled treatment trials were conducted in 1023 patients receiving hemodialysis with moderate to severe secondary hyperparathyroidism...
January 10, 2017: JAMA: the Journal of the American Medical Association
https://www.readbyqxmd.com/read/28095294/a-novel-slc12a1-gene-mutation-associated-with-hyperparathyroidism-hypercalcemia-nephrogenic-diabetes-insipidus-and-nephrocalcinosis-in-four-patients
#9
Sariya Wongsaengsak, Alaina P Vidmar, Ananta Addala, Elaine S Kamil, Paola Seqeira, Benjamin Fass, Pisit Pitukcheewanont
Solute Carrier Family 12 member 1 (SLC12A1) gene encodes the sodium-potassium-chloride co-transporter (NKCC2) at the apical membrane of the thick ascending loop of Henle (TAL). Bartter's syndrome (BS) type I is a rare, autosomal recessive, renal tubular disorder associated with mutation of the SLC12A1 gene. Presenting features include: hypokalemic metabolic alkalosis, hypercalciuria and nephrocalcinosis. The many allelic variants reported present with a spectrum of phenotypes, biochemical abnormalities and clinical severities...
January 14, 2017: Bone
https://www.readbyqxmd.com/read/28094886/the-parathyroid-hormone-family-member-tip39-interacts-with-sarco-endoplasmic-reticulum-ca-2-atpase-activity-by-influencing-calcium-homeostasis
#10
Emi Sato, Michael R Williams, James A Sanford, George L Sen, Takekuni Nakama, Shinichi Imafuku, Richard L Gallo
Darier disease (DD) is a genetic skin disease that is associated with mutations in the ATP2A2 gene encoding the type 2 sarco/endoplasmic reticulum Ca(2+) -ATPase (SERCA2). Mutations of this gene result in alterations of calcium homeostasis, abnormal epidermal adhesion and dyskeratosis. Silencing of ATP2A2 in monolayer cell culture of keratinocytes reduces desmoplakin expression at the borders of cells and impacts cell adhesion. Here, we report establishment of a three-dimensional (3D) epidermal model of DD, and use this model to evaluate peptide therapy with tuberoinfundibular peptide of 39 residues (TIP39) to normalize calcium transport...
January 17, 2017: Experimental Dermatology
https://www.readbyqxmd.com/read/28094875/neuroendocrinology-of-mast-cells-challenges-and-controversies
#11
REVIEW
Theoharis C Theoharides
Mast cells (MC) are hemopoietically-derived tissue immune cells that are ubiquitous in the body, including neuroendocrine organs such as the hypothalamus, pineal, pituitary, ovaries, pancreas and uterus where their action is not well understood. Mast cells have historically been associated with allergies because of their rich content of histamine and tryptase, but more recently with regulation of immunity and inflammation due their synthesis and release of numerous cytokines and chemokines. Mast cells are located perivascularly and express numerous receptors for diverse ligands such as allergens, pathogens, neurotransmitters, neuropeptides and hormones including acetylcholine, calcitonin gene-related peptide (CGRP), corticosteroids, corticotropin-releasing hormone (CRH), β-endorphin, epinephrine, 17β-estradiol, gonadotrophins, hemokinin-A (HKA), leptin, melatonin, neurotensin (NT), parathyroid hormone (PTH), substance P (SP) and vasoactive instestinal peptide (VIP)...
January 17, 2017: Experimental Dermatology
https://www.readbyqxmd.com/read/28094278/persistent-fibroblast-growth-factor-23-signalling-in-the-parathyroid-glands-for-secondary-hyperparathyroidism-in-mice-with-chronic-kidney-disease
#12
Kazuki Kawakami, Ai Takeshita, Kenryo Furushima, Masayasu Miyajima, Ikuji Hatamura, Makoto Kuro-O, Yasuhide Furuta, Kazushige Sakaguchi
Secondary hyperparathyroidism, in which parathyroid hormone (PTH) is excessively secreted in response to factors such as hyperphosphataemia, hypocalcaemia, and low 1,25-dihydroxyvitamin D (1,25(OH)2D) levels, is commonly observed in patients with chronic kidney disease (CKD), and is accompanied by high levels of fibroblast growth factor 23 (FGF23). However, the effect of FGF23 on the parathyroid glands (PG) remains controversial. To bind to FGF receptors, FGF23 requires αKlotho, which is highly expressed in the PG...
January 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28093352/cyp24a1-loss-of-function-clinical-phenotype-of-monoallelic-and-biallelic-mutations
#13
REVIEW
Thomas O Carpenter
CYP24A1, encoding the vitamin D-24-hydroxylase, is of major clinical and physiologic importance, serving to regulate the catabolism of 1,25-(OH)2D, the physiologically active vitamin D metabolite. In addition to facilitating catabolism of 1,25-(OH)2D, CYP24A1 also enhances the turnover and elimination of 25-OHD, the abundant precursor metabolite and storage form of the vitamin. CYP24A1 can be stimulated hormonally by 1,25-(OH)2D and by FGF23, whereas CYP27B1, encoding the vitamin D-1α-hydroxylase, is stimulated hormonally by parathyroid hormone (PTH) and downregulated by FGF23...
January 13, 2017: Journal of Steroid Biochemistry and Molecular Biology
https://www.readbyqxmd.com/read/28091892/bariatric-roux-en-y-gastric-bypass-surgery-adipocyte-proteins-involved-in-increased-bone-remodeling-in-humans
#14
Maria Fernanda G Biagioni, Adriana L Mendes, Célia Regina Nogueira, Celso V Leite, Loraine Gollino, Gláucia Mfs Mazeto
PURPOSE: Bariatric surgery has been associated with bone remodeling changes. The action of adipokines on the expression of receptor activator of nuclear factor kappa β ligand (RANKL) and osteoprotegerin (OPG) and on an increase in sclerostin could be related to these changes. MATERIALS AND METHODS: This study aimed to assess the repercussions of weight loss, fat mass (FM), and fat-free mass (FFM) loss and biochemical and hormonal changes on bone remodeling markers after Roux-en-Y gastric bypass (RYGB)...
January 13, 2017: Obesity Surgery
https://www.readbyqxmd.com/read/28091771/localization-of-parathyroid-adenomas-using-11-c-methionine-pet-after-prior-inconclusive-imaging
#15
Milou E Noltes, Annemieke M Coester, Anouk N A van der Horst-Schrivers, Bart Dorgelo, Liesbeth Jansen, Walter Noordzij, Clara Lemstra, Adrienne H Brouwers, Schelto Kruijff
PURPOSE: Minimally invasive parathyroidectomy (MIP) is the recommended treatment in primary hyperparathyroidism (pHPT) for which accurate preoperative localization is essential. The current imaging standard consists of cervical ultrasonography (cUS) and MIBI-SPECT/CT. (11)C-MET PET/CT has a higher resolution than MIBI-SPECT/CT. The aim of this study was to determine the diagnostic performance of (11)C-MET PET/CT after initial inconclusive or negative localization. METHODS: We performed a retrospective single center cohort study of patients with pHPT undergoing parathyroid surgery after prior negative imaging and later localization by means of (11)C-MET PET/CT between 2006 and 2014...
January 14, 2017: Langenbeck's Archives of Surgery
https://www.readbyqxmd.com/read/28091752/management-of-secondary-hyperparathyroidism-practice-patterns-and-outcomes-of-cinacalcet-treatment-with-or-without-active-vitamin%C3%A2-d-in-austria-and-switzerland-the-observational-transit-study
#16
Wolfgang Pronai, Alexander R Rosenkranz, Andreas Bock, Renate Klauser-Braun, Christine Jäger, Gunther Pendl, Margit Hemetsberger, Karl Lhotta
Secondary hyperparathyroidism is a complex disorder requiring an individualized multicomponent treatment approach. This study was conducted to identify treatment combinations used in clinical practice in Austria and Switzerland and the potential to control this disorder. A total of 333 adult hemodialysis and peritoneal dialysis patients were analyzed. All patients received conventional care prior to initiation of a cinacalcet-based regimen. During the study, treatment components, e.g. cinacalcet, active vitamin D analogues and phosphate binders, were adapted to individual patient requirements and treatment dynamics were documented...
January 13, 2017: Wiener Klinische Wochenschrift
https://www.readbyqxmd.com/read/28090675/cross-sectional-study-shows-that-impaired-bone-mineral-status-and-metabolism-are-found-in-non-mosaic-triple-x-syndrome
#17
Stefano Stagi, Mariarosaria Di Tommaso, Perla Scalini, Elena Sandini, Fabrizio Masoni, Francesco Chiarelli, Alberto Verrotti, Sabrina Giglio, Silvia Romano, Maurizio de Martino
AIM: The effect of a supernumerary X chromosome on bones has not been reported and this study evaluated bone mineral status and metabolism in non-mosaic triple X syndrome. METHODS: This cross-sectional study comprised 19 girls, with a median age of 10.9 years, with nonmosaic triple X syndrome and a control group matched for age and body size. We studied ionised and total calcium, phosphate, parathyroid hormone (PTH), 25-hydroxyvitamin D (25(OH)D), 1,25-dihydroxyvitamin D, osteocalcin, bone alkaline phosphatase levels and urinary deoxypyridinoline concentrations...
January 15, 2017: Acta Paediatrica
https://www.readbyqxmd.com/read/28090276/overexpression-of-recombinant-human-teriparatide-rhpth-1-34-in-escherichia-coli-an-innovative-gene-fusion-approach
#18
Nahid Bakhtiari, Zahra Amini Bayat, Sepideh Sagharidouz, Mohsen Vaez
BACKGROUND: Parathyroid hormone is an 84-amino acid peptide secreted by the parathyroid glands. Its physiological role is maintenance of normal serum calcium level and bone remodeling. Biological activity of this hormone is related to N-terminal 1-34 amino acids. The recombinant form of hormone (1-34) has been approved for treatment of osteoporosis from 2002. In this study, a novel fusion partner has been developed for preparation of high yield recombinant 1-34 amino acids of hPTH. METHODS: Novel nucleotide cassette designed encoding a chimeric fusion protein comprising of a fusion partner consisting of a His-tag in N-terminal, 53 amino acids belong to Escherichia coli (E...
January 2017: Avicenna Journal of Medical Biotechnology
https://www.readbyqxmd.com/read/28087977/fibroblast-growth-factor-23-fgf23-in-untreated-nephrotic-syndrome
#19
Ashok Kumar Yadav, Raja Ramachandran, Abhinav Aggarwal, Vinod Kumar, Krishan Lal Gupta, Vivekanand Jha
AIM: Despite its importance in bone and cardiovascular disease in subjects with kidney disease, there is no data on fibroblast growth factor 23 (FGF23) perturbations in nephrotic syndrome. We evaluated FGF23 and markers of mineral bone metabolism in subjects with untreated NS. METHODS: In this cross-sectional study, we measured circulating levels of FGF23, 25-hydroxy vitamin D [25(OH)D], 1,25 di-hydroxy vitamin D [1,25(OH)2 D], serum albumin, serum calcium, phosphorus, creatinine and intact parathyroid hormone (iPTH) in 101 patients with adults onset NS and 40 healthy controls...
January 14, 2017: Nephrology
https://www.readbyqxmd.com/read/28087963/vitamin-d-deficiency-rickets-even-with-abundant-sunlight-a-case-to-highlight-emerging-problem
#20
T H Ting, A S Devnani
We describe a case of vitamin-D-deficiency rickets in a young child to highlight its existence in Malaysia where sunlight is abundant throughout the year. The child presented with deformity of both legs. He came from an educated urban family but remained indoors most of the time. Radiographs of knees and wrists showed changes of florid rickets. Low serum 25-hydoxyvitamin-D, high parathyroid hormone, normal serum phosphate and calcium levels, and normal renal function clinched the diagnosis of vitamin-D-deficiency rickets...
December 2016: Medical Journal of Malaysia
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