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calcium phosphate

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https://www.readbyqxmd.com/read/29684776/cyclic-uniaxial-compression-of-human-stem-cells-seeded-on-a-bone-biomimetic-nanocomposite-decreases-anti-osteogenic-commitment-evoked-by-shear-stress
#1
Walter Baumgartner, Isabelle Schneider, Samuel C Hess, Wendelin J Stark, Sonja Märsmann, Marzia Brunelli, Maurizio Calcagni, Paolo Cinelli, Johanna Buschmann
OBJECTIVE: Chemical supplementation of culture media to induce differentiation of adult stem cells seeded on a scaffold may mask other differentiation triggers such as scaffold stiffness, chemical composition or mechanical stimulation. However, stem cells can be differentiated towards osteoblasts without any supplementation given an appropriate osteogenic scaffold and an adequate mechanical stimulation. MATERIALS AND METHODS: Electrospun meshes of poly-lactic-co-glycolic acid and amorphous calcium phosphate nanoparticles (PLGA/aCaP) in a weight ratio of 60:40 were seeded with human adipose-derived stem cells (ASCs) and cultured in DMEM...
April 5, 2018: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29682371/colonic-mucosal-ulceration-and-gastrointestinal-bleeding-associated-with-sevelamer-crystal-deposition-in-a-patient-with-end-stage-renal-disease
#2
Sudheer Nambiar, Unnikrishnan Kunjan Pillai, Joe Devasahayam, Tony Oliver, Asha Karippot
End stage renal disease (ESRD) population account for 1.9 per patient year of hospital admissions annually. ESRD population are at increased risk of bleeding secondary to use of anticoagulation during hemodialysis and uremia induced platelet dysfunction. Gastrointestinal bleeding accounts for 3-7% of all deaths in ESRD population. Lower gastrointestinal bleeding refers to blood loss from a site in the gastrointestinal tract distal to the ligament of Treitz. It is usually suspected when a patient complains of hematochezia...
2018: Case Reports in Nephrology
https://www.readbyqxmd.com/read/29680885/spatial-distribution-of-uranium-and-basic-water-quality-parameter-in-the-capital-of-bihar-and-consequent-ingestion-dose
#3
Deepak Kumar, Anshuman Singh, Rishi Kumar Jha
Investigation of presence of Uranium (U) in groundwater/drinking water is an active are of research due to its chemical and radiological toxicity as well as long-term health effects. The current study had the objective of estimating U as a naturally occurring radioactive element in groundwater samples and assessment of ingestion dose, when groundwater is the source of drinking water. The random sampling method was chosen for the collection of samples based on population density. The estimation of U was done using LED fluorimeter...
April 21, 2018: Environmental Science and Pollution Research International
https://www.readbyqxmd.com/read/29680517/a-study-of-difference-in-serum-25-hydroxyvitamin-d-concentrations-in-patients-with-angiographically-defined-coronary-disease-and-healthy-subjects
#4
Haleh Rokni, Mohsen Moohebati, Maryam Saberi-Karimian, Seyed Reza Mirhafez, Hamideh Ghazizadeh, Atieh Laal-Vazifeh, Maryam Shekari, Faezeh Movahhedianfar, Mohsen Mazidi, Shokoufeh Bonakdaran, Gordon A Ferns, Majid Ghayour-Mobarhan
BACKGROUND: Cardiovascular disease (CVD) is one of the most important causes of death in developing countries. The current study evaluates the serum 25-hydroxyvitamin D (25OHD), phosphate and calcium levels in patients with angiographically-defined coronary artery disease (CAD) and healthy subjects in a sample population in northeastern Iran. METHODS: There were 566 subjects aged between 20-80 years out of whom283 subjects with CAD were divided into two study groups based on their angiogram results; those with > 50% stenosis of one or more coronary arteries and those with ≤ 50% stenosis...
April 12, 2018: Diabetes & Metabolic Syndrome
https://www.readbyqxmd.com/read/29676206/fabrication-of-vascularized-bone-flaps-with-sustained-release-of-rhbmp-2-and-arteriovenous-bundle
#5
Bo Li, Changshun Ruan, Yufei Ma, Zhifeng Huang, Zhenfei Huang, Gang Zhou, Jing Zhang, Hai Wang, Zhihong Wu, Guixing Qiu
INTRODUCTION: It is a common treatment strategy in the clinic to transplant a vascularized bone flap for a large bone defect. But it is difficult for peripheral blood vessels to grow into the central region of a large bone construct. In this study, we fabricated a vascularized bone flap from a 3D-printed biodegradable PLGA/β-TCP scaffold using the combination of an arteriovenous (AV) bundle and recombinant human bone morphogenetic protein-2 (rhBMP-2). MATERIALS AND METHODS: A degradable porous poly (lactide-co-glycolide) /-tri-calcium phosphate (PLGA/β-TCP) scaffold was prepared by adopting 3D plotting and a low-temperature deposition technique...
April 20, 2018: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/29675209/calcium-ii-catalyzed-enantioselective-conjugate-additions-of-amines
#6
Brice E Uno, Rachel D Dicken, Louis R Redfern, Charlotte M Stern, Greg G Krzywicki, Karl A Scheidt
The direct enantioselective chiral calcium(ii)·phosphate complex (Ca[CPA]2 )-catalyzed conjugate addition of unprotected alkyl amines to maleimides was developed. This mild catalytic system represents a significant advance towards the general convergent asymmetric amination of α,β-unsaturated electrophiles, providing medicinally relevant chiral aminosuccinimide products in high yields and enantioselectivities. Furthermore, the catalyst can be reused directly from a previously chromatographed reaction and still maintain both high yield and selectivity...
February 14, 2018: Chemical Science
https://www.readbyqxmd.com/read/29674238/calcium-metabolism-serum-markers-in-adult-patients-with-epilepsy-and-the-effect-of-vitamin-d-supplementation-on-seizure-control
#7
Mario Tombini, Andrea Palermo, Giovanni Assenza, Giovanni Pellegrino, Antonella Benvenga, Chiara Campana, Anda Mihaela Naciu, Federica Assenza, Vincenzo Di Lazzaro
PURPOSE: To evaluate serum markers of calcium metabolism in adult patients with epilepsy (PWE) treated with antiepileptic drugs (AEDs) and the effect of vitamin D supplementation on seizure frequency. METHODS: Serum levels of calcium, phosphate, intact parathyroid hormone (iPTH) and 25-hydroxyvitamin D (25[OH]D) were compared in 160 PWE on chronic therapy with AEDs and 42 matched controls. Blood concentrations were analyzed taking into account the different features of epilepsy and treatment...
April 11, 2018: Seizure: the Journal of the British Epilepsy Association
https://www.readbyqxmd.com/read/29673685/comparison-of-efficacy-of-dental-varnish-containing-fluoride-either-with-cpp-acp-or-bioglass-on-root-caries-ex-vivo-study
#8
A Sleibi, A R Tappuni, Graham R Davis, P Anderson, A Baysan
OBJECTIVES: To compare the efficacy of fluoride varnishes either casein phosphopeptide-amorphous calcium phosphate (CPP-ACP) or bioglass particles on the severity index of root caries. METHODS: Visual-tactile assessments including lesion hardness was carried out to categorise the severity index of 80 extracted teeth with primary root caries. These teeth were randomly divided into four groups; CPP-ACP and fluoride, bioglass and fluoride, fluoride only, and no treatment...
April 16, 2018: Journal of Dentistry
https://www.readbyqxmd.com/read/29672880/enamel-renal-syndrome-case-report
#9
Luiz Henrique Soares Torres, Sérgio Lins de-Azevedo-Vaz, Danielle Resende Camisasca Barroso, Daniela Nascimento Silva, Tânia Regina Grão Velloso, Liliana Aparecida Pimenta de Barros
AIMS: to describe a case in which dental changes were observed and investigation proceeded to consider Enamel-Renal-Syndrome (ERS), a rare disorder that associates amelogenesis imperfecta with nephrocalcinosis. CASE REPORT: an 11-year-old male patient upon intraoral examination revealed generalized gingival hyperplasia, a few teeth were absent clinically and the remaining ones were yellowish-brown in color. The enamel alterations were suggesting of amelogenesis imperfecta...
April 19, 2018: Special Care in Dentistry
https://www.readbyqxmd.com/read/29672760/nutritional-status-and-survival-of-maintenance-hemodialysis-patients-receiving-lanthanum-carbonate
#10
Hirotaka Komaba, Takatoshi Kakuta, Takehiko Wada, Miho Hida, Takao Suga, Masafumi Fukagawa
Background: Hyperphosphatemia and poor nutritional status are associated with increased mortality. Lanthanum carbonate is an effective, calcium-free phosphate binder, but little is known about the long-term impact on mineral metabolism, nutritional status and survival. Methods: We extended the follow-up period of a historical cohort of 2292 maintenance hemodialysis patients that was formed in late 2008. We examined 7-year all-cause mortality according to the serum phosphate levels and nutritional indicators in the entire cohort and then compared the mortality rate of the 562 patients who initiated lanthanum with that of the 562 propensity score-matched patients who were not treated with lanthanum...
April 16, 2018: Nephrology, Dialysis, Transplantation
https://www.readbyqxmd.com/read/29672438/alterations-of-inflammatory-and-matrix-production-indices-in-celiac-disease-with-low-bone-mass-on-long-term-gluten-free-diet
#11
Michele Di Stefano, Manuela Bergonzi, Irene Benedetti, Mara De Amici, Cristina Torre, Natascia Brondino, Emanuela Miceli, Elisabetta Pagani, Gian L Marseglia, Gino R Corazza, Antonio Di Sabatino
BACKGROUND: A clinically meaningful impairment of bone mass secondary to malabsorption is frequent in untreated celiac disease. In adult patients, a rigorous gluten-free diet (GFD) significantly improves, but does not always normalize, bone mineral density (BMD). The reason for this marginal response is unclear. Accordingly, we evaluated the role of both local and systemic factors for bone loss in celiac patients on long-term GFD. STUDY: In a prospective cohort, 22 patients with low lumbar and/or femoral BMD and 22 with normal BMD underwent bone and mineral metabolism evaluation: we tested calcium, phosphate, parathyroid hormone, and vitamin D; telopeptide of type I collagen, a bone resorption index; propeptide of type I procollagen, a bone neoformation index; receptor antagonist of NF-kB ligand, an osteoclast-stimulating factor; osteoprotegerin (OPG), a decoy receptor for RANKL...
April 18, 2018: Journal of Clinical Gastroenterology
https://www.readbyqxmd.com/read/29667913/ubiquitin-c-terminal-hydrolase-l1-deletion-is-associated-with-urinary-%C3%AE-klotho-deficiency-and-perturbed-phosphate-homeostasis
#12
Naomi C Boisvert, Chet E Holterman, Alexey Gutsol, Josee Coulombe, Wanling Pan, R Todd Alexander, Douglas A Gray, Chris R Kennedy
Loss of ubiquitin C-terminal hydrolase L1 (UCHL1), a deubiquitinating enzyme required for neuronal function, led to hyperphosphatemia accompanied by phosphaturia in mice, while calcium homeostasis remained intact. We therefore investigated the mechanisms underlying the phosphate imbalance in Uchl1-/- mice. Interestingly, phosphaturia was not a result of lower renal brush border membrane sodium-phosphate cotransporter expression as sodium-phosphate cotransporter 2a and 2c expression levels were similar to wild type levels...
April 18, 2018: American Journal of Physiology. Renal Physiology
https://www.readbyqxmd.com/read/29667853/evaluation-and-management-of-subchondral-calcium-phosphate-injection-technique-to-treat-bone-marrow-lesion
#13
Diego Costa Astur, Eduardo Vasconcelos de Freitas, Pedro Barreira Cabral, Caio Carvalho Morais, Bruno Silveira Pavei, Camila Cohen Kaleka, Pedro Debieux, Moises Cohen
Purpose This study aimed to compile available data in medical literature about subchondral calcium phosphate injection, comparing results obtained with this technique, as well as indications, complications, and other important factors in treatment of bone marrow lesions. Designs A literature review using PubMed and Medline database in order to identify works with terms "subchondral calcium phosphate injection," " subchondroplasty®," "bone marrow lesion," and "knee." Eight relevant articles were found...
April 1, 2018: Cartilage
https://www.readbyqxmd.com/read/29664880/split-depressed-lateral-tibial-plateau-fractures-a-comparision-of-augmented-percutaneous-screws-versus-augmented-plate-and-screw-construct-in-a-cadaveric-model
#14
Richard J Bowles, Vivek Chadayammuri, Antonio Brecevich, Todd Baldini, Cyril Mauffrey
OBJECTIVES: To compare the strength of fixation of percutaneous screw versus plate/screw fixation in a paired cadaver model of OTA 41-B3 (1) (Schatzker type II) split depression fractures of the lateral tibial plateau. METHODS: Six matched pairs of cadaveric knees were acquired. A OTA 41-B3 (Schatzker type II) split depression fracture was created in all specimens using a standardized method. One specimen from each matched pair of knees was fixed with percutaneous screws, and the other was fixed with a plate/screw construct...
April 3, 2018: Journal of Orthopaedic Trauma
https://www.readbyqxmd.com/read/29664498/-hypophosphatemia-in-preterm-infants-a-bimodal-disorder
#15
María Paz Cubillos Celis, Patricia Mena Nannig
New nutritional approaches to treat extreme premature babies have demonstrated relevant eviden ce of metabolic disturbances with early hypophosphatemia, especially in patients with intrauterine growth restriction (IUGR). They have shown late hypophosphatemia, as well, which is characteristic in the metabolic bone disease. A sytematic search of literature describing metabolic disturbances of phosphorus in preterm newborns is presented, related to the use of early parenteral nutrition and also in the context of metabolic bone disease...
February 2018: Revista Chilena de Pediatría
https://www.readbyqxmd.com/read/29662200/targeting-sphingosine-1-phosphate-lyase-as-an-anabolic-therapy-for-bone-loss
#16
Sarah Weske, Mithila Vaidya, Alina Reese, Karin von Wnuck Lipinski, Petra Keul, Julia K Bayer, Jens W Fischer, Ulrich Flögel, Jens Nelsen, Matthias Epple, Marta Scatena, Edzard Schwedhelm, Marcus Dörr, Henry Völzke, Eileen Moritz, Anke Hannemann, Bernhard H Rauch, Markus H Gräler, Gerd Heusch, Bodo Levkau
Sphingosine-1-phosphate (S1P) signaling influences bone metabolism, but its therapeutic potential in bone disorders has remained unexplored. We show that raising S1P levels in adult mice through conditionally deleting or pharmacologically inhibiting S1P lyase, the sole enzyme responsible for irreversibly degrading S1P, markedly increased bone formation, mass and strength and substantially decreased white adipose tissue. S1P signaling through S1P2 potently stimulated osteoblastogenesis at the expense of adipogenesis by inversely regulating osterix and PPAR-γ, and it simultaneously inhibited osteoclastogenesis by inducing osteoprotegerin through newly discovered p38-GSK3β-β-catenin and WNT5A-LRP5 pathways...
April 16, 2018: Nature Medicine
https://www.readbyqxmd.com/read/29662050/does-vitamin-d-affect-chronic-renal-allograft-function-in-pediatric-transplant-patients
#17
Brooke Wile, Elisa Yoo, Ana Catalina Alvarez Elias, Lakshmimathy Subramanian, Kathryn Eager, Ajay Parkesh Sharma, Guido Filler
BACKGROUND Correction of hypovitaminosis D is simple, but it is unclear whether it is associated with an accelerated decline of renal allograft function in pediatric renal transplantation patients. This retrospective single center cohort study aimed at analyzing the effect of vitamin D and covariates on the slope of 1/creatinine after the first year. MATERIAL AND METHODS After ethics committee approval, 37 (14 male) pediatric renal transplant recipients on mycophenolate mofetil, who were followed between 2006 and 2014, were included in this study...
April 17, 2018: Annals of Transplantation: Quarterly of the Polish Transplantation Society
https://www.readbyqxmd.com/read/29662018/rheological-and-mechanical-properties-of-thermoresponsive-methylcellulose-calcium-phosphate-based-injectable-bone-substitutes
#18
Öznur Demir Oğuz, Duygu Ege
In this study, a novel injectable bone substitute (IBS) was prepared by incorporating a bioceramic powder in a polymeric solution comprising of methylcellulose (MC), gelatin and citric acid. Methylcellulose was utilized as the polymeric matrix due to its thermoresponsive properties and biocompatibility. 2.5 wt % gelatin and 3 wt % citric acid were added to the MC to adjust the rheological properties of the prepared IBS. Then, 0, 20, 30 and 50 wt % of the bioceramic component comprising tetracalcium phosphate/hydroxyapatite (TTCP/HA), dicalcium phosphate dehydrate (DCPD) and calcium sulfate dehydrate (CSD) were added into the prepared polymeric component...
April 14, 2018: Materials
https://www.readbyqxmd.com/read/29661307/effect-of-ph-and-precursor-salts-on-in-situ-formation-of-calcium-phosphate-nanoparticles-in-methylcellulose-hydrogel
#19
Min Hee Kim, Hanna Park, Won Ho Park
Thermo-reversible hydrogels have been widely studied in biomedical research fields, because of their potential performance in drug delivery and tissue engineering. In this study, a novel thermo-sensitive methylcellulose (MC) hydrogel based on calcium phosphate nanoparticles (CaP NPs) was prepared by in situ formation process in which precursor salts induced a salt-out effect in the MC solution. Based on the Hofmeister series, CaCl2 , Na2 HPO4 , and NaH2 PO4 precursor salts with a good salt-out effect were used as the precursor salts for CaP NPs...
July 1, 2018: Carbohydrate Polymers
https://www.readbyqxmd.com/read/29660680/phase-composition-and-morphological-characterization-of-human-kidney-stones-using-ir-spectroscopy-scanning-electron-microscopy-and-x-ray-rietveld-analysis
#20
Paramita Chatterjee, Arup Chakraborty, Alok K Mukherjee
Pathological calcification in human urinary tract (kidney stones) is a common problem affecting an increasing number of people around the world. Analysis of such minerals or compounds is of fundamental importance for understanding their etiology and for the development of prophylactic measures. In the present study, structural characterization, phase quantification and morphological behaviour of thirty three (33) human kidney stones from eastern India have been carried out using IR spectroscopy (FT-IR), powder X-ray diffraction (PXRD) and scanning electron microscopy (SEM)...
April 9, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
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