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calcium phosphate

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https://www.readbyqxmd.com/read/29223393/mersalyl-prevents-the-tl-induced-permeability-transition-pore-opening-in-the-inner-membrane-of-ca2-loaded-rat-liver-mitochondria
#1
Sergey M Korotkov, Svetlana A Konovalova, Vladimir P Nesterov, Irina V Brailovskaya
It was earlier shown that the calcium load of rat liver mitochondria in medium containing TlNO3 and KNO3 resulted in the Tl+-induced mitochondrial permeability transition pore (MPTP) opening in the inner membrane. This opening was accompanied by an increase in swelling and membrane potential dissipation and a decrease in state 3, state 4, and 2,4-dinitrophenol-uncoupled respiration. This respiratory decrease was markedly leveled by mersalyl (MSL), the phosphate symporter (PiC) inhibitor which poorly stimulated the calcium-induced swelling, but further increased the potential dissipation...
December 6, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29218858/in-vitro-and-in-vivo-study-of-commercial-calcium-phosphate-cement-hydroset%C3%A2
#2
Niall W Kent, Gordon Blunn, Natalia Karpukhina, Graham Davis, Roberta Ferro de Godoy, Rory M Wilson, Melanie Coathup, Lyris Onwordi, Wen Yu Quak, Robert Hill
The commercial calcium phosphate cement, HydroSet™, was investigated in vitro, studying phase formation, compressive strength and setting time, followed by an ovine in vivo study to measure osseointegration, bone apposition and bone-to-graft contact. The X-ray diffraction and 31 P Magic Angle Spinning Nuclear Magnetic Resonance (MAS NMR) results showed the initial formation of octacalcium phosphate and hydroxyapatite at one hour. Over 7 days the octacalcium phosphate transformed to apatite, which was the only crystalline phase of the cement at 28 days...
January 2018: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/29218081/tetramethylpyrazine-phosphate-and-borneol-combination-therapy-synergistically-attenuated-ischemia-reperfusion-injury-of-the-hypothalamus-and-striatum-via-regulation-of-apoptosis-and-autophagy-in-a-rat-model
#3
Bin Yu, Ming Ruan, Tao Liang, Shi-Wen Huang, Sheng-Jin Liu, Hai-Bo Cheng, Xiang-Chun Shen
The combination of tetramethylpyrazine (TMP) and borneol (BO) has shown promise for treatment of cerebral ischemia in clinical and experimental studies. However, the mechanism for the synergistic effect of these compounds is unclear. In this study, global cerebral ischemia-reperfusion (GCIR) was induced in rats that were subsequently treated with tetramethylpyrazine phosphate (TMPP) (13.3 mg/kg), BO (0.16 g/kg), or the combination TMPP + BO. Neuronal ultrastructure and intracellular calcium [Ca2+]i levels were evaluated in hypothalamus and striatum...
2017: American Journal of Translational Research
https://www.readbyqxmd.com/read/29217881/reduced-baroreflex-sensitivity-decreased-heart-rate-variability-with-increased-arterial-stiffness-in-predialysis
#4
C Lal, M Kaur, A K Jaryal, K K Deepak, D Bhowmik, S K Agarwal
High cardiovascular morbidity and mortality is observed in predialytic chronic kidney disease (CKD) patients. The underlying mechanism of cardiovascular dysfunction often remains unclear. The present study was designed to perform multiparametric assessment of baroreflex sensitivity (BRS), arterial stiffness indices, and cardiovascular variabilities (heart rate variability [HRV] and blood pressure variability [BPV]) together in predialytic CKD patients; compare it with normal healthy controls; and determine their relationships in predialytic nondiabetic CKD patients...
November 2017: Indian Journal of Nephrology
https://www.readbyqxmd.com/read/29217507/multidisciplinary-approach-to-understand-medial-arterial-calcification
#5
Ophélie Gourgas, Juliana Marulanda, Peng Zhang, Monzur Murshed, Marta Cerruti
OBJECTIVE: Vascular calcification significantly increases morbidity in life-threatening diseases, and no treatments are available because of lack of understanding of the underlying molecular mechanism. Here, we study the physicochemical details of mineral nucleation and growth in an animal model that faithfully recapitulates medial arterial calcification in humans, to understand how pathological calcification is initiated on the vascular extracellular matrix. APPROACH AND RESULTS: MGP (matrix Gla protein) is a potent mineralization inhibitor...
December 7, 2017: Arteriosclerosis, Thrombosis, and Vascular Biology
https://www.readbyqxmd.com/read/29215868/synthesis-of-ph-responsive-biodegradable-mesoporous-silica-calcium-phosphate-hybrid-nanoparticle-as-a-high-potential-drug-carrier
#6
Yongju He, Bowen Zeng, Shuquan Liang, Mengqiu Long, Hui Xu
Biodegradability is one of the most critical issues for silica-based nanodrug delivery systems, since it is crucial prerequisites for the successful translation in clinics. In this work, a novel mesoporous silica-calcium phosphate (MS-CAP) hybrid nanocarrier with a fast pH-responsive biodegradation rate was developed by a one-step method, where CAP precursors (Ca2+ and PO43-) were incorporated into silica matrix during the growth process. The morphology and structure of MS-CAP were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), N2 adsorption-desorption isotherms, fourier transformed infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS)...
December 7, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29211905/effect-of-different-concentrations-of-dietary-p-and-ca-on-plasma-inorganic-p-and-urinary-p-excretion-using-noncolostomized-and-colostomized-broilers
#7
Megharaja K Manangi, Pramir Maharjan, Craig N Coon
Two 5-d bioassays were conducted to explore the P physiological threshold in broilers based on plasma inorganic P (iP), urinary P and Ca, and excreta P and Ca measurements in non-colostomized and colostomized broilers fed with different concentrations of non-phytate P (NPP) and Ca. In Experiment 1, 80 40-day-old Cobb 500 non-colostomized male broilers were assorted into 8 groups consisting of 10 broilers each and placed in individual metabolic cages. Similarly, 8 colostomized broilers of same age were allotted to 8 individual metabolic cages...
December 2, 2017: Poultry Science
https://www.readbyqxmd.com/read/29211281/effect-of-fluoride-dentifrice-and-casein-phosphopeptide-amorphous-calcium-phosphate-cream-with-and-without-fluoride-in-preventing-enamel-demineralization-in-a-ph-cyclic-study
#8
Priscila de Pinto Sinfiteli, Thereza Christina Lopes Coutinho, Patrícia Regina Almeida de Oliveira, Wesley Felisberto Vasques, Leandra Matos Azevedo, André Maues Brabo Pereira, Monica Almeida Tostes
OBJECTIVE: Casein phosphopeptide-amorphous calcium phosphate (CPP-ACP) complexes are anticariogenic and capable of remineralizing the early stages of enamel lesions. The use of fluoride prevents dental decay and the association of CPP-ACP with fluoride can increase remineralization. To evaluate the effect of CPP-ACP and CPP-ACPF creams associated with a fluoride dentifrice to prevent enamel demineralization in a pH cyclic model. MATERIAL AND METHODS: Previously selected by surface microhardness (SH) analysis, human enamel blocks (n = 56) were submitted to daily treatment with dentifrice in a pH-cycling model...
November 2017: Journal of Applied Oral Science: Revista FOB
https://www.readbyqxmd.com/read/29211280/in-vitro-effect-of-amorphous-calcium-phosphate-paste-applied-for-extended-periods-of-time-on-enamel-remineralization
#9
Ana Elisa de Mello Vieira, Marcelle Danelon, Danielle Mendes da Camara, Eliana Rodrigues Rosselli, Stuart R Stock, Mark L Cannon, Xianghui Xiao, Francesco De Carlo, Alberto Carlos Botazzo Delbem
OBJECTIVES: Dental applications based on the unique characteristics of amorphous calcium phosphate stabilized by casein phosphopeptides (CPP-ACP) have been proposed, as well as the improvement of its properties. The objective of this study was to determine the ability of topically applied CPP-ACP from a commercial product to remineralize subsurface lesions when applied for extended periods of time (3 h and 8 h). MATERIAL AND METHODS: Artificially induced carious lesions were produced in 50 bovine enamel blocks previously selected by surface hardness...
November 2017: Journal of Applied Oral Science: Revista FOB
https://www.readbyqxmd.com/read/29210384/structures-and-infrared-spectra-of-calcium-phosphate-clusters-by-ab-initio-methods-with-implicit-solvation-models
#10
Tzu-Jen Lin, Cheng-Chau Chiu
Since the first detection of pre-nucleation clusters during the formation of calcium phosphate minerals, determining such clusters' compositions and structures has become crucial for understanding the early-stage nucleation of these minerals in solutions. In previous experimental studies, the composition and sizes of pre-nucleation clusters have been calculated, but their structural information has been difficult to determine because they are very small (<1 nm). In this study, we examined the structures and infrared spectra of small- and medium-sized calcium phosphate clusters using ab initio calculations combined with implicit solvation models...
December 6, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/29208626/the-effect-of-extended-release-niacin-on-markers-of-mineral-metabolism-in-ckd
#11
Rakesh Malhotra, Ronit Katz, Andrew Hoofnagle, Andrew Bostom, Dena E Rifkin, Ruth Mcbride, Jeffrey Probstfield, Geoffrey Block, Joachim H Ix
BACKGROUND AND OBJECTIVES: Niacin downregulates intestinal sodium-dependent phosphate transporter 2b expression and reduces intestinal phosphate transport. Short-term studies have suggested that niacin lowers serum phosphate concentrations in patients with CKD and ESRD. However, the long-term effects of niacin on serum phosphate and other mineral markers are unknown. DESIGN, SETTING, PARTICIPANTS, & MEASUREMENTS: The Atherothrombosis Intervention in Metabolic Syndrome with Low HDL/High Triglycerides: Impact on Global Health Trial was a randomized, double-blind, placebo-controlled trial testing extended release niacin in persons with prevalent cardiovascular disease...
December 5, 2017: Clinical Journal of the American Society of Nephrology: CJASN
https://www.readbyqxmd.com/read/29208555/hollow-mesoporous-zirconia-delivery-system-for-biomineralization-precursors
#12
Xue-Qing Huang, Hong-Ye Yang, Tao Luo, Cui Huang, Franklin R Tay, Li-Na Niu
Strategies based on the combination of nanocarrier delivery systems and scaffolds provide bone tissue engineering scaffolds with multifunctional capability. Zirconia, a biocompatible ceramic commonly used in orthopedic and dental implants, was used to synthesize hollow mesoporous nanocapsules for loading, storage and sustained release of a novel polyamine-stabilized liquid precursor phase of amorphous calcium phosphate (PAH-ACP) for collagen biomineralization and bone marrow stromal cells osteoinduction. Hollow mesoporous zirconia (hmZrO2) nanocapsules loaded with biomimetic precursors exhibited pH-sensitive release capability and good biocompatibility...
December 2, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/29208280/formulation-and-biological-actions-of-nano-bioglass-ceramic-particles-doped-with-calcarea-phosphorica-for-bone-tissue-engineering
#13
S Dinesh Kumar, K Mohamed Abudhahir, N Selvamurugan, S Vimalraj, R Murugesan, N Srinivasan, A Moorthi
The improvisation of the treatment procedures for treating the various kind of bone defects such as, bone or dental trauma and for diseases such as osteoporosis, osteomyelitis etc., need the suitable and promising biomaterials with resemblance of bone components. Bioactive glass ceramic (BGC) has recently acquired great attention as the most promising biomaterials; hence it has been widely applied as a filler material for bone tissue regeneration. Because it elicts specific biological responses after implantation in addition more potential in formation of strong interface with both hard and soft tissues by dissolution of calcium and phosphate ions...
February 1, 2018: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/29208022/role-of-endoplasmic-reticulum-stress-in-the-protective-effects-of-ppar%C3%AE-%C3%AE-activation-on-endothelial-dysfunction-induced-by-plasma-from-patients%C3%A2-with-lupus
#14
Marta Toral, Rosario Jiménez, Miguel Romero, Iñaki Robles-Vera, Manuel Sánchez, Mercedes Salaices, José Mario Sabio, Juan Duarte
BACKGROUND: We tested whether GW0742, a peroxisome proliferator-activated receptor beta/delta (PPARβ/δ) agonist, improves endothelial dysfunction induced by plasma from patients with systemic lupus erythematosus (SLE) involving the inhibition of endoplasmic reticulum (ER) stress. METHODS: A total of 12 non-pregnant women with lupus and 5 non-pregnant healthy women (controls) participated in the study. Cytokines and double-stranded DNA autoantibodies (anti-dsDNA) were tested in plasma samples...
December 6, 2017: Arthritis Research & Therapy
https://www.readbyqxmd.com/read/29207799/change-in-bone-mineral-density-and-role-of-vitamin-d-and-calcium-supplementation-during-treatment-of-first-episode-nephrotic-syndrome
#15
Virendra Kumar Yadav, Shobha Sharma, Pradeep Kumar Debata, Seema Patel, Bhaskar C Kabi, Kailash Chandra Aggrawal
Introduction: Nephrotic Syndrome (NS) is one of the common illnesses in childhood. Oral glucocorticoids are mainstay of treatment, which are known to cause various short term and long term adverse effects including osteoporosis. Children with first episode and infrequent relapsing NS are not prescribed Calcium (Ca) and Vitamin D (VitD) supplements routinely. Aim: To observe change in Bone Mineral Density (BMD) in children during first episode of NS and role of VitD and Ca supplementation during the treatment of first episode of NS...
September 2017: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/29207136/exploiting-novel-valve-interstitial-cell-lines-to-study-calcific-aortic-valve-disease
#16
Hiu-Gwen Tsang, Lin Cui, Colin Farquharson, Brendan M Corcoran, Kim M Summers, Vicky E Macrae
Calcific aortic valve disease (CAVD) involves progressive valve leaflet thickening and severe calcification, impairing leaflet motion. The in vitro calcification of primary rat, human, porcine and bovine aortic valve interstitial cells (VICs) is commonly employed to investigate CAVD mechanisms. However, to date, no published studies have utilised cell lines to investigate this process. The present study has therefore generated and evaluated the calcification potential of immortalized cell lines derived from sheep and rat VICs...
November 27, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/29205875/a-case-report-of-basic-calcium-phosphate-mimicking-septic-arthritis
#17
Queenie Luu, Siroos Nasibi, Praneal Sharma, Andrew Bonura, David Massasso
We report a case of a 53-year-old man who presented with a diagnostic dilemma mimicking septic arthritis. It is important to consider the diagnosis of calcific peri-arthritis clinically and recognize the hallmarks on radiograph and magnetic resonance imaging as this disease process resolves completely with conservative management like in our patient, and does not require operative intervention.
December 4, 2017: International Journal of Rheumatic Diseases
https://www.readbyqxmd.com/read/29202723/changes-in-urinary-risk-profile-after-short-term-low-sodium-and-low-calcium-diet-in-recurrent-swiss-kidney-stone-formers
#18
Harald Seeger, Andrea Kaelin, Pietro M Ferraro, Damian Weber, Philippe Jaeger, Patrice Ambuehl, William G Robertson, Robert Unwin, Carsten A Wagner, Nilufar Mohebbi
BACKGROUND: Kidney stone disease is common in industrialized countries. Recently, it has attracted growing attention, because of its significant association with adverse renal outcomes, including end stage renal disease. Calcium-containing kidney stones are frequent with high recurrence rates. While hypercalciuria is a well-known risk factor, restricted intake of animal protein and sodium, combined with normal dietary calcium, has been shown to be more effective in stone prevention compared with a low-calcium diet...
December 4, 2017: BMC Nephrology
https://www.readbyqxmd.com/read/29202036/free-radicals-and-advanced-chemistries-involved-in-cell-membrane-organization-influence-oxygen-diffusion-and-pathology-treatment
#19
Richard C Petersen
A breakthrough has been discovered in pathology chemistry related to increasing molecular structure that can interfere with oxygen diffusion through cell membranes. Free radicals can crosslink unsaturated low-viscosity fatty acid oils by chain-growth polymerization into more viscous liquids and even solids. Free radicals are released by mitochondria in response to intermittent hypoxia that can increase membrane molecular organization to reduce fluidity and oxygen diffusion in a possible continuing vicious cycle toward pathological disease...
2017: AIMS Biophysics
https://www.readbyqxmd.com/read/29201053/superfast-set-strong-and-less-degradable-mineral-trioxide-aggregate-cement
#20
Abdullah Alqedairi, Carlos A Muñoz-Viveros, Eugene A Pantera, Marc Campillo-Funollet, Hussam Alfawaz, Ensanya Ali Abou Neel, Tariq S Abuhaimed
Purpose: Despite the good sealing ability and biocompatibility of mineral trioxide aggregate (MTA), its slow setting, high degradation, and weakness limit its use in surgical endodontics and high stress-bearing areas. This study aimed to develop two new liquids to control these drawbacks. They were prepared from calcium chloride, fumed silica, and hydroxyapatite or calcium phosphate and coded "H" and "P," respectively. Methods: Portland cement, Grey ProRoot® MTA, and white ProRoot MTA were mixed with distilled water (control) or liquid "H" or "P...
2017: International Journal of Dentistry
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