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Hydroxyapatite

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https://www.readbyqxmd.com/read/29242735/microcalcified-hepatic-metastases-incidentally-detected-on-f-18-naf-pet-ct-in-a-patient-with-prostate-cancer
#1
Gul Ege Aktas, Ali Sarıkaya, Nuray Can, Selin Soyluoglu Demir
F-18 NaF PET/CT evaluation has gained importance in recent years. Achievements from F-18 NaF PET/CT are: higher sensitivity of positron imaging, higher target background ratio with higher tracer accumulation in bone hydroxyapatite and higher specificity through CT correlation. These properties have also given directions to new research fields based on imaging microcalcifications, very recently. A limited number of cases have reported the F-18 NaF uptake in macrocalcified soft tissue metastases. Although the presence of microcalcification was not proved; accumulation of F-18 NaF in the metastatic brain lesion with no visible calcification on the CT, in a patient with ductal breast carcinoma has also been reported...
December 2017: Nuclear Medicine and Molecular Imaging
https://www.readbyqxmd.com/read/29242420/a-versatile-fabrication-strategy-of-three-dimensional-foams-for-soft-and-hard-tissue-engineering
#2
Changlu Xu, Yanjie Bai, Shaofeng Yang, Huilin Yang, David A Stout, Phong Tran, Lei Yang
The fabrication strategies of three-dimensional porous biomaterials have been extensively studied and well established in the past decades, yet the biocompatibility and versatility in preparing porous architecture still lacks. Herewith, we present a novel and green fabrication technique of 3D porous foams for both soft and hard engineering. By utilizing the gelatinization and retrogradation property of starches, stabilized porous constructs made of various building blocks from living cells to ceramic particles were created for the first time...
December 15, 2017: Biomedical Materials
https://www.readbyqxmd.com/read/29241052/hydroxyapatite-chitosan-based-bioactive-hybrid-biomaterials-with-improved-mechanical-strength
#3
A Zima
Composites consisting of hydroxyapatite (HA) and chitosan (CTS) have recently been intensively studied. In this work, a novel inorganic-organic (I/O) HA/CTS materials in the form of granules were prepared through a simple solution-based chemical method. During the synthesis of these hybrids, the electrostatic complexes between positively charged, protonated amine groups of chitosan and the negative phosphate species (HPO42- and H2PO4-) were formed. Our biocomposites belong to the class I of hybrids, which was confirmed by FTIR studies...
December 5, 2017: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29238189/diethyl-citrate-and-sodium-citrate-reduce-the-cytotoxic-effects-of-nanosized-hydroxyapatite-crystals-on-mouse-vascular-smooth-muscle-cells
#4
Chong-Yu Zhang, Xin-Yuan Sun, Jian-Ming Ouyang, Bao-Song Gui
Objective: This study aimed to investigate the damage mechanism of nanosized hydroxyapatite (nano-HAp) on mouse aortic smooth muscle cells (MOVASs) and the injury-inhibiting effects of diethyl citrate (Et2Cit) and sodium citrate (Na3Cit) to develop new drugs that can simultaneously induce anticoagulation and inhibit vascular calcification. Methods: The change in cell viability was evaluated using a cell proliferation assay kit, and the amount of lactate dehydrogenase (LDH) released was measured using an LDH kit...
2017: International Journal of Nanomedicine
https://www.readbyqxmd.com/read/29236151/the-effects-of-hap-and-macrophage-cells-to-the-expression-of-inflammatory-factors-and-apoptosis-in-hk-2-cells-of-vitro-co-cultured-system
#5
Junchuan Yu, Yaoliang Deng, Zhiwei Tao, Weixia Liang, Xiaofeng Guan, Jihua Wu, Xin Ning, Yunlong Liu, Quan Liu, Ziqi He
This study developed an in vitro system by co-culturing HK-2 cells with different concentration of hydroxyapatite (HAP) and/or macrophage cells to simulate the internal environment of urolithiasis as far as possible, investigating the regulatory effects of macrophage cells on HAP-induced expression of relative inflammatory factors of HK-2 cells. The control group (H group) was only comprised of HK-2 cells. Experimental groups included co-culturing HK-2 cells and macrophage cells (H + M group), co-culturing HK-2 cells and HAP (H + A group), co-culturing macrophage cells and HAP (M + A group), and co-culturing HK-2 cells and macrophage cells with HAP (H + M + A group)...
December 13, 2017: Urolithiasis
https://www.readbyqxmd.com/read/29235542/bone-mineral-density-measurements-in-vertebral-specimens-and-phantoms-using-dual-layer-spectral-computed-tomography
#6
Kai Mei, Benedikt J Schwaiger, Felix K Kopp, Sebastian Ehn, Alexandra S Gersing, Jan S Kirschke, Daniela Muenzel, Alexander A Fingerle, Ernst J Rummeny, Franz Pfeiffer, Thomas Baum, Peter B Noël
To assess whether phantomless calcium-hydroxyapatite (HA) specific bone mineral density (BMD) measurements with dual-layer spectral computed tomography are accurate in phantoms and vertebral specimens. Ex-vivo human vertebrae (n = 13) and a phantom containing different known HA concentrations were placed in a semi-anthropomorphic abdomen phantom with different extension rings simulating different degrees of obesity. Phantomless dual-layer spectral CT was performed at different tube current settings (500, 250, 125 and 50 mAs)...
December 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29234845/eanm-guideline-for-radionuclide-therapy-with-radium-223-of-metastatic-castration-resistant-prostate-cancer
#7
Thorsten D Poeppel, Daria Handkiewicz-Junak, Michael Andreeff, Alexander Becherer, Andreas Bockisch, Eva Fricke, Lilli Geworski, Alexander Heinzel, Bernd J Krause, Thomas Krause, Markus Mitterhauser, Wilfried Sonnenschein, Lisa Bodei, Roberto C Delgado-Bolton, Michael Gabriel
Radium Ra-223 dichloride (radium-223, Xofigo®) is a targeted alpha therapy approved for the treatment of castration-resistant prostate cancer (CRPC) with symptomatic bone metastases and no known visceral metastatic disease. Radium-223 is the first targeted alpha therapy in this indication providing a new treatment option, with evidence of a significant survival benefit, both in overall survival and in the time to the first symptomatic skeletal-related event. The skeleton is the most common metastatic site in patients with advanced prostate cancer...
December 12, 2017: European Journal of Nuclear Medicine and Molecular Imaging
https://www.readbyqxmd.com/read/29232659/phytosphingosine-prevents-the-formation-of-young-salivary-biofilms-in-vitro
#8
Floris J Bikker, Michel A Hoogenkamp, Amine Malhaoui, Kamran Nazmi, Jessica Neilands, Bastiaan P Krom
Dental biofilms are formed in a multistep process that is initiated by the adhesion of oral bacteria to the dental hard surface. As dental biofilms are associated with oral diseases their control is necessary in order to maintain oral health. Recently, it was revealed that phytosphingosine (PHS)-treated hydroxyapatite discs showed anti-adhesive activity in a static in vitro biofilm model against Streptococcus mutans. The goal of the present study was to further unravel the anti-adhesive and anti-biofilm properties of PHS in both static and dynamic in vitro biofilm models against a full salivary inoculum...
December 13, 2017: Caries Research
https://www.readbyqxmd.com/read/29232643/mechanical-corrosion-and-biocompatibility-behaviour-of-mg-3zn-ha-biodegradable-composites-for-orthopaedic-fixture-accessories
#9
Satish Jaiswal, R Manoj Kumar, Pallavi Gupta, Murali Kumaraswamy, Partha Roy, Debrupa Lahiri
Development of biodegradable implants has grown into one of the important areas in medical science. Degradability becomes more important for orthopaedic accessories used to support fractured and damaged bones, in order to avoid second surgery for their removal after healing. Clinically available biodegradable orthopaedic materials are mainly made of polymers or ceramics. These orthopaedic accessories have an unsatisfactory mechanical strength, when used in load-bearing parts. Magnesium and its alloys can be suitable candidate for this purpose, due to their outstanding strength to weight ratio, biodegradability, non-toxicity and mechanical properties, similar to natural bone...
November 21, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/29232186/cemented-or-cementless-total-knee-arthroplasty-comparative-results-of-200-cases-at-a-minimum-follow-up-of-11-years
#10
Jean-Louis Prudhon, Régis Verdier
INTRODUCTION: Since 1996 we have been using cementless fixation with hydroxyapatite (HA) coating. The purpose of this paper is to compare survivorship of a series of 100 cemented Total Knee Arthroplasty (TKA) to a similar series of 100 cementless with a follow up of 11-16 years. Material methods: Both TKA are mobile bearing total knee postero-stabilized. They can be used with cement or without cement. Among 1030 New Wave TKATM implanted from 2002 to 2015 we have identified 100 cemented TKAs and 100 cementless TKAs...
2017: SICOT-J
https://www.readbyqxmd.com/read/29231215/involvement-of-fak-mediated-bmp-2-smad-pathway-in-mediating-osteoblast-adhesion-and-differentiation-on-nano-ha-chitosan-composite-coated-titanium-implant-under-diabetic-conditions
#11
Xiang-Yu Ma, Ya-Fei Feng, Tian-Sheng Wang, Wei Lei, Xiang Li, Da-Peng Zhou, Xin-Xin Wen, Hai-Long Yu, Liang-Bi Xiang, Lin Wang
Chitosan (CS)-based hydroxyapatite (HA) composites have emerged as a novel strategy for promoting bone regeneration. Here nanophase HA/CS composite coated porous titanium implants (nCT) were fabricated and their biological behavior under diabetic conditions was investigated. We proposed that the focal adhesion kinase (FAK)-mediated BMP-2/Smad pathway played a role in mediating the promotive effect of nCTs on osteoblast adhesion and differentiation under diabetes-induced high reactive oxygen species (ROS) condition...
December 12, 2017: Biomaterials Science
https://www.readbyqxmd.com/read/29229389/direct-evidence-that-klk4-is-a-hydroxyapatite-binding-protein
#12
Vidal A Perez, Jonathan E Mangum, Michael J Hubbard
The protease kallikrein 4 (KLK4) plays a pivotal role during dental enamel formation by degrading the major enamel protein, amelogenin, prior to the final steps of enamel hardening. KLK4 dysfunction is known to cause some types of developmental defect in enamel but the mechanisms responsible for transient retention of KLK4 in semi-hardened enamel matrix remain unclear. To address contradictory reports about the affinity of KLK4 for enamel hydroxyapatite-like mineral, we used pure components in quasi-physiological conditions and found that KLK4 binds hydroxyapatite directly...
December 8, 2017: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29228043/novel-systems-for-the-application-of-isolated-tensile-compressive-and-shearing-stimulation-of-distraction-callus-tissue
#13
Nicholaus Meyers, Julian Schülke, Anita Ignatius, Lutz Claes
BACKGROUND: Distraction osteogenesis is a procedure widely used for the correction of large bone defects. However, a high complication rate persists, likely due to insufficient stability during maturation. Numerical fracture healing models predict bone regeneration under different mechanical conditions allowing fixation stiffness optimization. However, most models apply a linear elastic material law inappropriate for the transient stresses/strains present during limb lengthening or segment transport...
2017: PloS One
https://www.readbyqxmd.com/read/29227674/multivalent-presentation-of-peptide-targeting-groups-alters-polymer-biodistribution-to-target-tissues
#14
Maureen R Newman, Steven G Russell, Christopher S Schmitt, Ian A Marozas, Tzong-Jen Sheu, J Edward Puzas, Danielle S W Benoit
Drug delivery to bone is challenging, whereby drug distribution is commonly <1% of injected dose, despite development of several bone-targeted drug delivery systems specific to hydroxyapatite. These bone-targeted drug delivery systems still suffer from poor target cell localization within bone, as at any given time overall bone volume is far greater than acutely remodeled bone volume, which harbors relevant cell targets (osteoclasts or osteoblasts). Thus, there exists a need to target bone-acting drugs specifically to the cells responsible for bone remodeling...
December 11, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/29227620/nano-ag-zno-incorporated-hydroxyapatite-composite-coatings-highly-effective-infection-prevention-and-excellent-osteointegration
#15
Yanzhe Zhang, Xiangmei Liu, Zhaoyang Li, Shengli Zhu, Xu-Bo Yuan, Zhenduo Cui, Xianjin Yang, Paul K Chu, Shuilin Wu
The interfacial characterisics play an important role in infection prevention and osteointegration of artificial bone implants. In this work, both Ag and ZnO nanoparticles are incorporated into hydroxyapatite (HA) nano powders and deposited onto Ti6Al4V (Ti6) implants by laser cladding. The composite coatings possess a hierarchical surface structure with homogeneous distributions of Ag and ZnO. The Ag and ZnO nanoprticles are immobilized by laser cladding ensure long-term and gradual release of Ag and Zn ions at low cumulative concentrations of 36...
December 11, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29226584/wool-derived-keratin-hydrogel-enhances-implant-osseointegration-in-cancellous-bone
#16
Warwick J Duncan, Philippa F C Greer, Min-Ho Lee, Carolina Loch, Jennifer H A Gay
AIM: This study investigated whether a keratin hydrogel derived from wool enhances ossointegration of dental implants, using a cancellous bone model in sheep. METHOD: Ten female sheep received one dental implant per hind leg in the distal femoral condyles. Test implants were coated with 1 mL of keratin hydrogel containing sulphonated keratin and hydroxyapatite; control implants remained uncoated; implants were not functionally loaded axially. Biomechanical stability was tested with resonance frequency analysis (RFA) at placement and euthanasia...
December 11, 2017: Journal of Biomedical Materials Research. Part B, Applied Biomaterials
https://www.readbyqxmd.com/read/29225177/chitosan-based-hydrogel-assisted-spongelike-calcium-phosphate-mineralization-for-in-vitro-bsa-release
#17
Ahmed Salama
New chitosan-g- poly (3-sulfopropyl methacrylate), CHI-g-P(SPMA), hydrogel was prepared by free radical polymerization process and investigated as a template for biomimetic spongelike calcium phosphate mineralization in a solution mimicking physiological condition. Infrared spectroscopy, scanning electron microscopy, X-ray diffraction and transmission electron microscopy confirmed the predominant formation of rod-like hydroxyapatite. The swelling behavior of the nanocomposite was evaluated at different pHs and different saline concentrations...
December 7, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29223755/in-situ-biomineralization-by-silkworm-feeding-with-ion-precursors-for-the-improved-mechanical-properties-of-silk-fiber
#18
Zhenhu Guo, Wensheng Xie, Qin Gao, Dan Wang, Fei Gao, Shengrong Li, Lingyun Zhao
Possessing excellent biocompatibility, biodegradability and good reactive activity, silk fiber has been attracting great attention in biomedicine including surgical suture, drug delivery and tissue engineering. So far, several protocols have been developed to further improve the mechanical properties of the silk fiber. In current study, a novel in suit biomineralization strategy was developed to produce nano-hydroxyapatite (HA) strengthened silk fiber based on the natural alkaline condition in the body of silkworm by feeding the silkworm with ion precursors of Ca2+ and PO43- ions...
December 6, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29218858/in-vitro-and-in-vivo-study-of-commercial-calcium-phosphate-cement-hydroset%C3%A2
#19
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/29218771/menopause-related-appendicular-bone-loss-is-mainly-cortical-and-results-in-increased-cortical-porosity
#20
Åshild Bjørnerem, Xiaofang Wang, Minh Bui, Ali Ghasem-Zadeh, John L Hopper, Roger Zebaze, Ego Seeman
After menopause, remodeling becomes unbalanced and rapid. Each of the many remodeling transactions deposits less bone than it resorbed, producing microstructural deterioration. Trabecular bone is said to be lost more rapidly than cortical bone. However, because 80% of the skeleton is cortical, we hypothesized that most menopause-related bone loss and changes in bone microstructure are cortical, not trabecular in origin, and are the result of intracortical remodeling. Distal tibial and distal radial microstructure were quantified during 3...
December 8, 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
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