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https://www.readbyqxmd.com/read/29691822/porous-scaffolds-for-regeneration-of-cartilage-bone-and-osteochondral-tissue
#1
Guoping Chen, Naoki Kawazoe
Porous scaffolds play an important role as a temporary support for accommodation of seeded cells to control their functions and guide regeneration of functional tissues and organs. Various scaffolds have been prepared from biodegradable polymers and calcium phosphate. They have also been hybridized with bioactive factors to control differentiation of stem cells. Except the composition, porous structures of scaffolds are also extremely important for cell adhesion, spatial distribution and tissue regeneration...
2018: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/29691817/bioceramics-for-osteochondral-tissue-engineering-and-regeneration
#2
Sandra Pina, Rita Rebelo, Vitor Manuel Correlo, J Miguel Oliveira, Rui L Reis
Considerable advances in tissue engineering and regeneration have been accomplished over the last decade. Bioceramics have been developed to repair, reconstruct, and substitute diseased parts of the body and to promote tissue healing as an alternative to metallic implants. Applications embrace hip, knee, and ligament repair and replacement, maxillofacial reconstruction and augmentation, spinal fusion, bone filler, and repair of periodontal diseases. Bioceramics are well-known for their superior wear resistance, high stiffness, resistance to oxidation, and low coefficient of friction...
2018: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/29689558/fibulin-3-attenuates-phosphate-induced-vascular-smooth-muscle-cell-calcification-by-inhibition-of-oxidative-stress
#3
Trang T D Luong, Nadeshda Schelski, Beate Boehme, Manousos Makridakis, Antonia Vlahou, Florian Lang, Burkert Pieske, Ioana Alesutan, Jakob Voelkl
BACKGROUND/AIMS: Fibulin-3, an extracellular matrix glycoprotein, inhibits vascular oxidative stress and remodeling in hypertension. Oxidative stress is prevalent in chronic kidney disease (CKD) patients and is an important mediator of osteo-/chondrogenic transdifferentiation and calcification of vascular smooth muscle cells (VSMCs) during hyperphosphatemia. Therefore, the present study explored the effects of Fibulin-3 on phosphate-induced vascular calcification. METHODS: Experiments were performed in primary human aortic smooth muscle cells (HAoSMCs) treated with control or with phosphate without or with additional treatment with recombinant human Fibulin-3 protein or with hydrogen peroxide as an exogenous source of oxidative stress...
April 18, 2018: Cellular Physiology and Biochemistry
https://www.readbyqxmd.com/read/29687597/synergistic-effects-of-beta-tri-calcium-phosphate-and-porcine-derived-decellularized-bone-extracellular-matrix-in-3d-printed-polycaprolactone-scaffold-on-bone-regeneration
#4
Jun-Young Kim, Geunseon Ahn, Changhwan Kim, Jeong-Seok Lee, In-Gyu Lee, Sang-Hyun An, Won-Soo Yun, Shin-Yoon Kim, Jin-Hyung Shim
Bone-derived extracellular matrix (ECM) is widely used in studies on bone regeneration because of its ability to provide a microenvironment of native bone tissue. However, a hydrogel, which is a main type of ECM application, is limited to use for bone graft substitutes due to relative lack of mechanical properties. The present study aims to fabricate a scaffold for guiding effective bone regeneration. A polycaprolactone (PCL)/beta-tricalcium phosphate (β-TCP)/bone decellularized extracellular matrix (dECM) scaffold capable of providing physical and physiological environment are fabricated using 3D printing technology and decoration method...
April 24, 2018: Macromolecular Bioscience
https://www.readbyqxmd.com/read/29687410/laser-led-phototherapy-on-the-repair-of-tibial-fracture-treated-with-wire-osteosynthesis-evaluated-by-raman-spectroscopy
#5
Antônio L B Pinheiro, Luiz G P Soares, Aline C P da Silva, Nicole R S Santos, Anna Paula L T da Silva, Bruno Luiz R C Neves, Amanda P Soares, Landulfo Silveira
The aim of the present study was to assess, by means of Raman spectroscopy, the repair of complete surgical tibial fractures fixed with wire osteosynthesis (WO) treated or not with infrared laser (λ780 nm) or infrared light emitting diode (LED) (λ850 ± 10 nm) lights, 142.8 J/cm2 per treatment, associated or not to the use of mineral trioxide aggregate (MTA) cement. Surgical tibial fractures were created on 18 rabbits, and all fractures were fixed with WO and some groups were grafted with MTA. Irradiated groups received lights at every other day during 15 days, and all animals were sacrificed after 30 days, being the tibia removed...
April 23, 2018: Lasers in Medical Science
https://www.readbyqxmd.com/read/29685305/the-detection-of-metallic-residues-in-skin-stab-wounds-by-means-of-sem-eds-a-pilot-study
#6
Elisa Palazzo, Alberto Amadasi, Michele Boracchi, Guendalina Gentile, Francesca Maciocco, Matteo Marchesi, Riccardo Zoja
The morphological analysis of stab wounds may often not be accurate enough to link it with the type of wounding weapon, but a further evaluation may be performed with the search for metallic residues left during the contact between the instrument and the skin. In this study, Scanning Electron Microscopy-Energy Dispersive Spectroscopy (SEM-EDS) was applied to the study of cadaveric stab wounds performed with kitchen knives composed of iron, chromium and nickel, in order to verify the presence of metallic residues on the wound's edge...
May 2018: Science & Justice: Journal of the Forensic Science Society
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
#7
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
#8
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
#9
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
#10
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
#11
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
#12
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
#13
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
#14
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
#15
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
#16
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
#17
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
#18
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
#19
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
#20
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
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