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calcium phosphate

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https://www.readbyqxmd.com/read/29453251/a-novel-adipokine-fam19a5-inhibits-postinjury-neointima-formation-through-sphingosine-1-phosphate-receptor-2
#1
Yingbao Wang, Dixin Chen, Yan Zhang, Pingzhang Wang, Can Zheng, Songyang Zhang, Bing Yu, Lu Zhang, Guizhen Zhao, Baihui Ma, Zeyu Cai, Nan Xie, Shiyang Huang, Ziyi Liu, Xiaoning Mo, Youfei Guan, Xian Wang, Yi Fu, Dalong Ma, Ying Wang, Wei Kong
Background -Obesity plays crucial roles in the development of cardiovascular diseases (CVDs). However, the mechanisms that link obesity and CVDs remain elusive. Compelling evidence indicates that adipokines play an important role in obesity-related CVDs. Here, we found a new adipokine named family with sequence similarity 19, member A5 (FAM19A5), a protein with unknown function that was predicted to be distantly related to the CC-chemokine family. We aimed to test whether adipose-derived FAM19A5 regulates vascular pathology upon injury...
February 16, 2018: Circulation
https://www.readbyqxmd.com/read/29452584/high-phosphorus-intake-and-gut-related-parameters-results-of-a-randomized-placebo-controlled-human-intervention-study
#2
Ulrike Trautvetter, Amélia Camarinha-Silva, Gerhard Jahreis, Stefan Lorkowski, Michael Glei
BACKGROUND: In recent years, high phosphate intakes were discussed critically. In the small intestine, a part of the ingested phosphate and calcium precipitates to amorphous calcium phosphate (ACP), which in turn can precipitate other intestinal substances, thus leading to a beneficial modulation of the intestinal environment. Therefore, we analysed faecal samples obtained from a human intervention study regarding gut-related parameters. METHODS: Sixty-two healthy subjects (men, n = 30; women, n = 32) completed the double-blind, placebo-controlled and parallel designed study (mean age: 29 ± 7 years; mean BMI: 24 ± 3 kg/m 2 )...
February 16, 2018: Nutrition Journal
https://www.readbyqxmd.com/read/29452375/1%C3%AE-hydroxycholecalciferol-improves-the-growth-performance-and-up-regulates-the-mrna-expression-of-vitamin-d-receptor-in-the-small-intestine-and-kidney-of-broiler-chickens
#3
J C Han, J G Wang, G H Chen, J L Zhang, N Zhang, H X Qu, Y Guo, Y F Yan, X J Yang
1α-Hydroxycholecalciferol (1α-OH-D3) is a vitamin D derivative. The objective of this study was to evaluate the effects of 1α-OH-D3 on the growth and the mRNA expression of vitamin D receptor (VDR) in the small intestine and kidney of chickens. A total of 240 males of one-day-old Ross 308 broilers was randomly assigned to 4 treatments with 5 replicates of 12 birds per replicate. Three levels of 1α-OH-D3 (1.25, 2.5, and 5 μg/kg) were added to a basal diet containing 0.50% calcium (Ca), 0.25% non-phytate phosphorus (NPP), and without supplemental cholecalciferol (vitamin D3)...
February 14, 2018: Poultry Science
https://www.readbyqxmd.com/read/29452304/the-chondrocyte-channelome-a-narrative-review
#4
Ali Mobasheri, Csaba Matta, Ilona Uzielienè, Emma Budd, Pablo Martín-Vasallo, Eiva Bernotiene
Chondrocytes are the main cells in the extracellular matrix of articular cartilage and possess a highly differentiated phenotype that is the hallmark of the unique physiological functions of this specialised load-bearing connective tissue. The plasma membrane of articular chondrocytes contains a rich and diverse complement of membrane proteins, known as the membranome, which defines the cell surface phenotype of the cells. The membranome is a key target of pharmacological agents and is important for chondrocyte function...
February 13, 2018: Joint, Bone, Spine: Revue du Rhumatisme
https://www.readbyqxmd.com/read/29451708/promotion-of-bone-regeneration-on-titanium-implants-through-a-chemical-treatment-process-using-calcium-phosphate-slurry-microscopic-analysis-cellular-response-and-animal-experiment
#5
Tatsuro Ito, Naofumi Ohtsu, Masanari Tomozawa, Mitsuhiro Hirano, Hiroko Takita, Tadashi Iizuka, Atsuro Yokoyama
The present study provides scientific evidence that a new chemical treatment process using calcium phosphate slurry promotes bone regeneration on titanium (Ti) implants. The material's surface modified by the treatment was analyzed using microscopic observation and the bone regeneration efficacy was evaluated both in vitro and in vivo. Formation of a thin hydroxyapatite layer with a thickness of about 50 nm and an increase of surface roughness were confirmed by microscopic observations. Histological evaluation of rat femora implanted with the specimens showed that the areas of the specimens directly attached to bone tissue were significantly more extensive than those implanted with control Ti at 2 and 8 weeks...
February 16, 2018: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/29448712/a-simulated-body-fluid-evaluation-of-tio%C3%A2-barrier-oxide-layer-formed-by-electrochemical-reaction
#6
Jae-Myung Jang, Tae-Eon Park, Seung-Dai Kim, Han-Cheol Choe
The modified surface during implantation is considered to be an effective strategy to improve high adhesion of bone cell and osseointegration activity. In this paper, the TiO2 barrier oxide Layer has been fabricated by using the ion characteristic of an electrolytic solution, the surface characteristics have been investigated by EDS, XPS, and FE-SEM. From the analysis of the chemical states, phosphorus and calcium were observed in the TiO2 barrier layer, which were penetrated from the electrolyte into the oxide layer during deposit process...
March 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29448678/fabrication-and-friction-coefficient-of-graphene-oxide-reinforced-hydroxyapatite-composite
#7
Ming Gong, Qian Zhao, Liming Dai, Yingying Li, Tingshun Jiang
Graphene oxide (GO) reinforced hydroxyapatite (HA) composites with various contents of GO (HA/GO-C) were synthesized with addition of cetyltrimethyl ammonium bromide (CTAB) by a wetchemical precipitation method using diammonium hydrogen phosphate ((NH4)2HPO4) and calcium nitrate (Ca(NO3)2 · 4H2O) as the initial reactants, and their structure, morphology, crystallization, specific surface area were studied by FT-IR, SEM, Raman spectroscopy, XRD and BET. Particularly, the influence of GO addition and appiled load on the friction coefficient of the obtained composites was investigated...
March 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29448629/synthesis-and-characterization-of-calcium-phosphate-ceramic-poly-vinyl-alcohol-polycaprolactone-bilayer-nanocomposites-a-bone-tissue-regeneration-scaffold
#8
S Uma Maheshwari, K Govindan, M Raja, A Raja, M B S Pravin, S Vasanth Kumar
β Tricalcium phosphate ceramic was used to reinforce nanofibers in composite mats produced via electrospinning of poly(vinyl alcohol) (PVA), polycaprolactone (PCL) and (PVA: PCL) bilayers. The role of TCP ceramic on morphology of nanocomposites, crystalline structure, functional groups and thermal behaviour of nanocomposites were characterized by SEM, EDAX, XRD, FTIR and DSC analysis. Ultrathin cross-sections of the obtained nanocomposites were morphologically investigated with SEM and all fabricated composites consisted of fibers with average fiber diameter (AFD) around 100 nm except PCL-TCP fibers having AFD in the range of 608 nm...
March 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29448144/nanocements-produced-from-mesoporous-bioactive-glass-nanoparticles
#9
Min Sil Kang, Na-Hyun Lee, Rajendra K Singh, Nandin Mandakhbayar, Roman A Perez, Jung-Hwan Lee, Hae-Won Kim
Biomedical cements are considered promising injectable materials for bone repair and regeneration. Calcium phosphate composition sized with tens of micrometers is currently one of the major powder forms. Here we report a unique cement form made from mesoporous bioactive glass nanoparticles (BGn). The nanopowder could harden in reaction with aqueous solution at powder-to-liquid ratios as low as 0.4-0.5 (vs. 2.0-3.0 for conventional calcium phosphate cement CPC). The cementation mechanism investigated from TEM, XRD, FT-IR, XPS, and NMR analyses was demonstrated to be the ionic (Si and Ca) dissolution and then reprecipitation to form Si-Ca-(P) based amorphous nano-islands that could network the particles...
February 3, 2018: Biomaterials
https://www.readbyqxmd.com/read/29446542/novel-calcitonin-gene-related-peptide-chitosan-strontium-calcium-phosphate-cement-enhanced-proliferation-of-human-umbilical-vein-endothelial-cells-in-vitro
#10
Tiancheng Lv, Wei Liang, Li Li, Xu Cui, Xiaomou Wei, Haobo Pan, Bing Li
Bone cement materials have some disadvantages, including slow degradation and no biological activity, which greatly weakens their clinical application. Therefore, the search for a multifunctional bioactive bone cement has become urgent. In this study, a novel bone cement sample of calcitonin gene-related peptide (CGRP)/chitosan-strontium (Sr)-calcium phosphate cement (CPC) was developed. The structure and morphology were observed by scanning electron microscope (SEM). The cytotoxicity and proliferation of CGRP/chitosan-Sr-CPC were also measured...
February 15, 2018: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/29446270/a-comparative-evaluation-of-apf-gel-cpp-acp-paste-alone-and-in-combination-with-carbon-dioxide-laser-on-human-enamel-resistance-to-acid-solubility-using-atomic-absorption-spectrometry-an-in-vitro-study
#11
Ali Nozari, Azade Rafiee, Sara Dehghan Khalili, Reza Fekrazad
BACKGROUND: The aim of this study was to compare the effects of acidulated phosphate fluoride (APF) gel, calcium phosphopeptide-amorphous calcium phosphate (CPP/ACP) paste alone and in combination with CO2 laser on the resistance of enamel to acid solubility. METHODS: Ninety enamel sections were obtained from 15 extracted teeth and were randomly assigned to six groups: 1) control group; 2) APF group; 3) CPP-ACP group; 4) CO2 laser group; 5) APF + CO2 group; and 6) CPP-ACP + CO2 group...
April 2018: Minerva Stomatologica
https://www.readbyqxmd.com/read/29445220/association-of-admission-serum-levels-of-vitamin-d-calcium-phosphate-magnesium-and-parathormone-with-clinical-outcomes-in-neurosurgical-icu-patients
#12
Seyed Hossein Ardehali, Salman Dehghan, Ahmad Reza Baghestani, Aynaz Velayati, Zahra Vahdat Shariatpanahi
To evaluate the association of admission serum levels of 25(OH)D, parathormone and the related electrolytes with severity of illness and clinical outcomes in neurosurgical critically ill patients, serum levels of 25(OH)D, parathormone, calcium, magnesium, and phosphate, along with APACHE II score were measured for 210 patients upon admission. Mean serum 25(OH)D was 21.1 ± 7.4 ng/mL. 25(OH)D deficiency (less than 20 ng/dL) and elevated serum parathormone level were found in 47.6% and 38% of patients respectively...
February 14, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29445112/nanoanalytical-electron-microscopy-of-events-predisposing-to-mineralisation-of-turkey-tendon
#13
Michał M Kłosowski, Raffaella Carzaniga, Sandra J Shefelbine, Alexandra E Porter, David W McComb
The macro- and micro-structures of mineralised tissues hierarchy are well described and understood. However, investigation of their nanostructure is limited due to the intrinsic complexity of biological systems. Preceding transmission electron microscopy studies investigating mineralising tissues have not resolved fully the initial stages of mineral nucleation and growth within the collagen fibrils. In this study, analytical scanning transmission electron microscopy and electron energy-loss spectroscopy were employed to characterise the morphology, crystallinity and chemistry of the mineral at different stages of mineralization using a turkey tendon model...
February 14, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29444509/associations-between-intravenous-iron-inflammation-and-fgf23-in-non-dialysis-patients-with-chronic-kidney-disease-stages-3-5
#14
Katarzyna Muras-Szwedziak, Michal Nowicki
BACKGROUND/AIMS: Both iron deficiency and chronic inflammation are highly prevalent in patients with chronic kidney disease (CKD). The effect of intravenous iron infusion on mineral metabolism in CKD may be modified by inflammation. Intravenous iron theraphy may reduce peripheral degradation, secretion, clearence of iFGF23 and lead to hypophosphatemia. The aim of the study was to evaluate the effect of intravenous iron on mineral metabolism in CKD patients. METHODS: 35 non-dialysis patients with CKD stages 3-5...
February 8, 2018: Kidney & Blood Pressure Research
https://www.readbyqxmd.com/read/29443921/calcium-chloride-and-calcium-gluconate-in-neonatal-parenteral-nutrition-solutions-without-cysteine-compatibility-studies-using-laser-light-obscuration-methodology
#15
Robert K Huston, J Mark Christensen, Sultan M Alsharhani, Sumeia M Mohamed, Carl F Heisel
There are no compatibility studies for neonatal parenteral nutrition solutions without cysteine containing calcium chloride or calcium gluconate using light obscuration as recommended by the United States Pharmacopeia (USP). The purpose of this study was to do compatibility testing for solutions containing calcium chloride and calcium gluconate without cysteine. Solutions of TrophAmine and Premasol (2.5% amino acids), containing calcium chloride or calcium gluconate were compounded without cysteine. Solutions were analyzed for particle counts using light obscuration...
February 14, 2018: Nutrients
https://www.readbyqxmd.com/read/29443737/effect-of-tenofovir-on-renal-function-in-patients-with-chronic-hepatitis-b
#16
Woo Jin Jung, Jae Young Jang, Won Young Park, Soung Won Jeong, Hee Jeong Lee, Sang Joon Park, Sae Hwan Lee, Sang Gyune Kim, Sang-Woo Cha, Young Seok Kim, Young Deok Cho, Hong Soo Kim, Boo Sung Kim, Suyeon Park, Baigal Baymbajav
Tenofovir disoproxil fumarate (TDF) is widely used to treat patients with hepatitis B virus (HBV) infection. We investigated the effect of TDF on renal insufficiency in patients with chronic hepatitis B (CHB).A consecutive cohort analysis was applied to CHB patients taking prescribed TDF from January 2012 to May 2016 at Soonchunhyang University Seoul Hospital. Alterations over time in corrected calcium, phosphate, creatinine, and estimated glomerular filtration rate (eGFR) were analyzed using the generalized estimating equation method...
February 2018: Medicine (Baltimore)
https://www.readbyqxmd.com/read/29443548/sex-and-bone-specific-responses-in-bone-structure-to-exogenous-leptin-and-leptin-receptor-antagonism-in-the-ovine-fetus
#17
Miles J De Blasio, Stuart A Lanham, Dominique Blache, Richard Oc Oreffo, Abigail L Fowden, Alison J Forhead
Widespread expression of leptin and its receptor in developing cartilage and bone suggests that leptin may regulate bone growth and development in the fetus. Using micro-computed tomography, this study investigated the effects of exogenous leptin and leptin receptor antagonism on aspects of bone structure in the sheep fetus during late gestation. From 125-130 days of gestation (term ~145 days), chronically-catheterised singleton sheep fetuses were infused intravenously for five days with either saline (0.9% saline, n=13), recombinant ovine leptin at two doses (0...
February 14, 2018: American Journal of Physiology. Regulatory, Integrative and Comparative Physiology
https://www.readbyqxmd.com/read/29442498/proteostasis-and-the-regulation-of-intra-and-extracellular-protein-aggregation-by-atp-independent-molecular-chaperones-lens-%C3%AE-crystallins-and-milk-caseins
#18
John A Carver, Heath Ecroyd, Roger J W Truscott, David C Thorn, Carl Holt
Molecular chaperone proteins perform a diversity of roles inside and outside the cell. One of the most important is the stabilization of misfolding proteins to prevent their aggregation, a process that is potentially detrimental to cell viability. Diseases such as Alzheimer's, Parkinson's, and cataract are characterized by the accumulation of protein aggregates. In vivo, many proteins are metastable and therefore under mild destabilizing conditions have an inherent tendency to misfold, aggregate, and hence lose functionality...
February 14, 2018: Accounts of Chemical Research
https://www.readbyqxmd.com/read/29439698/a-retrospective-analysis-of-bone-mineral-status-in-patients-requiring-spinal-surgery
#19
Tobias Schmidt, Katharina Ebert, Tim Rolvien, Nicola Oehler, Jens Lohmann, Luca Papavero, Ralph Kothe, Michael Amling, Florian Barvencik, Haider Mussawy
BACKGROUND: Impaired bone quality is associated with poor outcome of spinal surgery. The aim of the study was to assess the bone mineral status of patients scheduled to undergo spinal surgery and to report frequencies of bone mineral disorders. METHODS: We retrospectively analyzed the bone mineral status of 144 patients requiring spinal surgery including bone mineral density by dual-energy X-ray absorptiometry (DXA) as well as laboratory data with serum levels of 25-hydroxyvitamin D (25-OH-D), parathyroid hormone, calcium, bone specific alkaline phosphate, osteocalcin, and gastrin...
February 13, 2018: BMC Musculoskeletal Disorders
https://www.readbyqxmd.com/read/29438347/mitochondrial-dynamics-in-basal-and-stressful-conditions
#20
REVIEW
Naima Zemirli, Etienne Morel, Diana Molino
The historical role of mitochondria resides in converting the energy released during the oxidation of macromolecules (carbohydrates, lipids and proteins) into adenosine tri-phosphate, a major form of chemically stored energy which sustains cell growth and homeostasis. Beyond this role in bioenergetics regulation, mitochondria play a role in several other cellular processes including lipid metabolism, cellular calcium homeostasis, autophagy and immune responses. Furthermore, mitochondria are highly dynamic organelles: as all other cellular endomembranes, they are continuously moving along cytoskeleton, and, most importantly, they constantly interact one with each other by membrane tethering, fusion and fission...
February 13, 2018: International Journal of Molecular Sciences
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