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Calcified Tissue International

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https://www.readbyqxmd.com/read/28795233/bicarbonate-transport-during-enamel-maturation
#1
REVIEW
Kaifeng Yin, Michael L Paine
Amelogenesis (tooth enamel formation) is a biomineralization process consisting primarily of two stages (secretory stage and maturation stage) with unique features. During the secretory stage, the inner epithelium of the enamel organ (i.e., the ameloblast cells) synthesizes and secretes enamel matrix proteins (EMPs) into the enamel space. The protein-rich enamel matrix forms a highly organized architecture in a pH-neutral microenvironment. As amelogenesis transitions to maturation stage, EMPs are degraded and internalized by ameloblasts through endosomal-lysosomal pathways...
August 9, 2017: Calcified Tissue International
https://www.readbyqxmd.com/read/28779183/does-a-treadmill-running-exercise-contribute-to-preventing-deterioration-of-bone-mineral-density-and-bone-quality-of-the-femur-in-kk-ay-mice-a-type-2-diabetic-animal-model
#2
Satoshi Takagi, Takenori Yamashita, Toshihiro Miura
Although it has been recently shown that type 2 diabetics have an increased risk of hip fracture, the effects of exercise therapy to prevent this have not been clarified. We examined whether a treadmill running exercise contributes to the bone mineral density (BMD) and bone microarchitecture of the femur and what kind of exercise intensity and duration are optimum in type 2 diabetes mellitus using KK-Ay diabetic mice. The mice were divided into two running groups, one fast speed and short duration (FS), the other slow speed and long duration (SL), and a group of controls with no running (CO)...
August 4, 2017: Calcified Tissue International
https://www.readbyqxmd.com/read/28761974/dicalcium-phosphate-anhydrous-an-appropriate%C3%A2-bioceramic-in-regeneration-of-critical-sized-radial-bone-defects-in-rats
#3
Ahmad Oryan, Soodeh Alidadi, Amin Bigham-Sadegh
The present study aimed to evaluate and compare the effectiveness of composites of calcium phosphates including β-tri calcium phosphate (β-TCP), dicalcium phosphate anhydrous (DCPA, monetite), mono-calcium phosphate monohydrate (MCPM), and hydroxyapatite (HA) with the chitosan-gelatin-platelet gel (CGP) on the healing of experimentally induced critical size radial bone defects in rats after 8 weeks of injury. Eighty bilateral bone defects were created in the radial bones of 40 adult male Sprague-Dawley rats...
July 31, 2017: Calcified Tissue International
https://www.readbyqxmd.com/read/28761973/enhanced-identification-of-potential-pleiotropic-genetic-variants-for-bone-mineral-density-and-breast-cancer
#4
Cheng Peng, Hui-Ling Lou, Feng Liu, Jie Shen, Xu Lin, Chun-Ping Zeng, Ji-Rong Long, Kuan-Jui Su, Lan Zhang, Jonathan Greenbaum, Wei-Feng Deng, Yu-Mei Li, Hong-Wen Deng
Epidemiological and clinical evidences have shown that bone mineral density (BMD) has a close relationship with breast cancer (BC). They might potentially have a shared genetic basis. By incorporating information about these pleiotropic effects, we may be able to explore more of the traits' total heritability. We applied a recently developed conditional false discovery rate (cFDR) method to the summary statistics from two independent GWASs to identify the potential pleiotropic genetic variants for BMD and BC...
July 31, 2017: Calcified Tissue International
https://www.readbyqxmd.com/read/28761972/evaluation-of-a-new-fully-automated-assay-for-plasma-intact-fgf23
#5
Jean-Claude Souberbielle, Dominique Prié, Marie-Liesse Piketty, Anya Rothenbuhler, Pierre Delanaye, Philippe Chanson, Etienne Cavalier
Several FGF23 immunoassays are available. However, they are reserved for research purposes as none have been approved for clinical use. We evaluated the performances of a new automated assay for intact FGF23 on the DiaSorin Liaison platform which is approved for clinical use. We established reference values in 908 healthy French subjects aged 18-89 years, and measured iFGF23 in patients with disorders of phosphate metabolism and in patients with chronic kidney disease (CKD). Intra-assay CV was 1.04-2.86% and inter-assay CV was 4...
July 31, 2017: Calcified Tissue International
https://www.readbyqxmd.com/read/28755011/impact-of-chiropractic-manipulation-on-bone-and-skeletal-muscle-of-ovariectomized-rats
#6
A López-Herradón, R Fujikawa, M Gómez-Marín, J P Stedile-Lovatel, F Mulero, J A Ardura, P Ruiz, I Muñoz, P Esbrit, I Mahíllo-Fernández, A Ortega-de Mues
Evidence suggests that chiropractic manipulation might exert positive effects in osteoporotic patients. The aim of this study was to evaluate the effects of chiropractic manipulation on bone structure and skeletal muscle in rats with bone loss caused by ovariectomy (OVX). The 6-month old Sprague-Dawley rats at 10 weeks following OVX or sham operation (Sh) did not suffer chiropractic manipulation (NM group) or were submitted to true chiropractic manipulation using the chiropractic adjusting instrument Activator V(®) three times/week for 6 weeks as follows: Force 1 setting was applied onto the tibial tubercle of the rat right hind limb (TM group), whereas the corresponding left hind limb received a false manipulation (FM group) consisting of ActivatorV(®) firing in the air and slightly touching the tibial tubercle...
July 28, 2017: Calcified Tissue International
https://www.readbyqxmd.com/read/28725909/skeletal-fluorosis-due-to-fluorocarbon-inhalation-from-an-air-dust-cleaner
#7
Katherine Peicher, Naim M Maalouf
Skeletal fluorosis (SF) is an osteosclerotic metabolic bone disorder caused by excessive ingestion or inhalation of fluoride. SF is extremely rare in developed countries. We report a case of SF due to inhalational abuse from a fluoride-containing air dust cleaner. A 33-year-old man with no past medical history presented with progressively worsening low back pain for 2 years. Physical examination was notable for loss of lumbar lordosis and tenderness over the lumbar spine. Radiographs were notable for uniform generalized osteosclerosis in the long bones, entire spine, rib cage, and pelvic bones, and loss of the normal lumbar curvature...
July 20, 2017: Calcified Tissue International
https://www.readbyqxmd.com/read/28725908/cyst-like-lesions-at-chondro-osseous-junction
#8
Zijun Zhang, Jeffrey Beckett, Lew Schon
This study described and histologically characterized a cyst-like lesion (CLL) at the chondro-osseous junction. Rat knees (n = 12), with or without excessive running-induced osteoarthritis (OA), were used for counting the incidence, morphological measurements, immunohistochemistry of the CLL. A typical CLL, appearing as a void space in the matrix, was located on the tidemark at the chondro-osseous junction. The content of the CLL included types II and VI collagen, proteoglycans but not intact chondrocytes. At least one CLL was found in 5/6 osteoarthritic knees and only 2/6 in the non-osteoarthritic knees...
July 19, 2017: Calcified Tissue International
https://www.readbyqxmd.com/read/28725907/development-of-a-new-immunoassay-for-human-cathepsin-k-generated-periostin-fragments-as-a-serum-biomarker-for-cortical-bone
#9
Patrick Garnero, Nicolas Bonnet, Serge L Ferrari
Periostin is a matricellular protein mainly expressed by periosteal cells and osteocytes in bone, but is also present in several other tissues. Available immunoassays use antibodies of unclear specificity. The aim of the study was to develop a bone-specific periostin ELISA based on the detection of fragments generated by the osteoclastic and osteocytic protease cathepsin K. In vitro digestion of human recombinant intact periostin by cathepsin K leads to the generation of multiple fragments. Using LS-MS/MS, it was found that the GSLQPIIK peptide was the most efficiently and abundantly generated periostin fragment...
July 19, 2017: Calcified Tissue International
https://www.readbyqxmd.com/read/28710506/obese-versus-normal-weight-late-adolescent-females-have-inferior-trabecular-bone-microarchitecture-a-pilot-case-control-study
#10
Joseph M Kindler, Norman K Pollock, Hannah L Ross, Christopher M Modlesky, Harshvardhan Singh, Emma M Laing, Richard D Lewis
Though still a topic of debate, the position that skeletal health is compromised with obesity has received support in the pediatric and adult literature. The limited data relating specifically to trabecular bone microarchitecture, however, have been relatively inconsistent. The aim of this pilot cross-sectional case-control study was to compare trabecular bone microarchitecture between obese (OB) and normal-weight (NW) late-adolescent females. A secondary aim was to compare diaphyseal cortical bone outcomes between these two groups...
July 14, 2017: Calcified Tissue International
https://www.readbyqxmd.com/read/28695239/occurrence-of-clinical-bone-fracture-following-a-prolonged-stay-in-intensive-care-unit-a-retrospective-controlled-study
#11
Anne-Françoise Rousseau, Etienne Cavalier, Jean-Yves Reginster, Pierre Damas, Olivier Bruyère
Clinical consequences of critical illness and critical care (CC) on bone health remain largely unexplored. This retrospective study aimed to assess the number of new bone fractures (BF) following a prolonged length of stay (LOS) in intensive care unit (ICU). Adults admitted in our tertiary ICU during 2013 with a stay >7 days were included (CC group). Patients who died in ICU or lost to follow-up were excluded. For each CC patient still alive after 2 years of follow-up, 2 control patients, scheduled for surgery during 2013, were recruited and matched for gender and age...
July 10, 2017: Calcified Tissue International
https://www.readbyqxmd.com/read/28676897/health-related-quality-of-life-in-adults-with-osteogenesis-imperfecta
#12
Jannie Dahl Hald, Lars Folkestad, Torben Harsløf, Kim Brixen, Bente Langdahl
Osteogenesis imperfecta (OI) is a systemic connective tissue disorder most often caused by mutations in collagen type 1 related genes. Patients with OI suffer from multiple fractures and various degrees of growth deficiency and bone deformity. It is unknown whether the systemic effect of defect collagen type 1 influences the quality of life in patients with OI. We therefore aimed to investigate health-related quality of life (HRQoL) in a well-characterized cohort of adult patients with OI. We included 85 adult patients with mild to severe OI (types I, III, and IV) and obtained information about skeletal- and non-skeletal phenotypes and patient demographics...
July 4, 2017: Calcified Tissue International
https://www.readbyqxmd.com/read/28664329/in-type-2-diabetes-subjects-trabecular-bone-score-is-better-associated-with-carotid-intima-media-thickness-than-bmd
#13
Carla Caffarelli, Amalia Giambelluca, Viola Ghini, Valentina Francolini, Maria Dea Tomai Pitinca, Ranuccio Nuti, Stefano Gonnelli
Literature data reported that in elderly subjects, carotid intima-media thickness (IMT) was negatively associated with bone mineral density (BMD). Paradoxically, type-2 diabetes (T2DM) patients, despite having higher BMD, present an increased risk of fragility fractures and cardiovascular complications. Some studies have reported trabecular bone score (TBS), an index of trabecular bone quality, as possibly being reduced in T2DM. This study aimed to evaluate whether in T2DM subjects TBS was better associated with IMT with respect to BMD...
June 29, 2017: Calcified Tissue International
https://www.readbyqxmd.com/read/28647775/a-natural-calcium-rich-marine-multi-mineral-complex-preserves-bone-structure-composition-and-strength-in-an-ovariectomised-rat-model-of-osteoporosis
#14
Orlaith Brennan, Joseph Sweeney, Brian O'Meara, Amro Widaa, Franck Bonnier, Hugh J Byrne, Denise M O'Gorman, Fergal J O'Brien
Calcium supplements are used as an aid in the prevention of osteopenia and osteoporosis and also for the treatment of patients when used along with medication. Many of these supplements are calcium carbonate based. This study compared a calcium-rich, marine multi-mineral complex (Aquamin) to calcium carbonate in an ovariectomised rat model of osteoporosis in order to assess Aquamin's efficacy in preventing the onset of bone loss. Animals were randomly assigned to either non-ovariectomy control (Control), ovariectomy (OVX) plus calcium carbonate, ovariectomy plus Aquamin or ovariectomy plus Aquamin delay where Aquamin treatment started 8 weeks post OVX...
June 24, 2017: Calcified Tissue International
https://www.readbyqxmd.com/read/28624935/eldecalcitol-an-active-vitamin-d3-derivative-prevents-trabecular-bone-loss-and-bone-fragility-in-type-i-diabetic-model-rats
#15
Satoshi Takeda, Mitsuru Saito, Sadaoki Sakai, Kenji Yogo, Keishi Marumo, Koichi Endo
Diabetes mellitus is known to adversely affect the bones and be associated with increased fracture risk. We examined whether eldecalcitol (ELD), an active vitamin D3 derivative, could inhibit the diabetic bone loss in streptozotocin-induced type I diabetic rats. ELD (10, 20, or 40 ng/kg), alfacalcidol (ALF; 25, 50, or 100 ng/kg), or vehicle was administered 5 times per week for 12 weeks from 1 week after diabetes induction. Normal control rats received the vehicle. Bone turnover markers, bone mineral density (BMD), and biomechanical strength of the lumbar spine and femur were measured, and bone histomorphometry was performed...
June 17, 2017: Calcified Tissue International
https://www.readbyqxmd.com/read/28612084/histological-evaluation-of-bone-repair-with-hydroxyapatite-a-systematic-review
#16
REVIEW
Héllen L Oliveira, Wellington L O Da Rosa, Carlos E Cuevas-Suárez, Neftali L V Carreño, Adriana F da Silva, Thomas N Guim, Odir A Dellagostin, Evandro Piva
The aim of this study was to evaluate the morphological bone response in animal experiments by applying hydroxyapatite grafts in critical and non-critical size bone defects. Current report followed the guidelines established by the Preferred Reporting Items for Systematic Reviews and Meta-Analyses. Animal experiments were selected by assessing repair of bone defects with hydroxyapatite as bone graft and with blood clot only as control. Eight articles were identified in specialized literature and included in the meta-analysis...
June 13, 2017: Calcified Tissue International
https://www.readbyqxmd.com/read/28589206/micrornas-and-fracture-healing
#17
REVIEW
Mary Nugent
MicroRNAs (miRNAs) are small molecules found to have major regulatory roles in many biological processes. This review aims to provide an overview of the recent advances in knowledge of the role of miRNAs in fracture healing and bone repair. A search of the published literature was performed (using the PubMed database) to include all relevant studies published in English. These studies were then reviewed and the results condensed into this review paper. MiRNAs have now been shown to have significant alterations in expression levels in bone tissue in the presence of fractures...
June 6, 2017: Calcified Tissue International
https://www.readbyqxmd.com/read/28589205/effects-of-teriparatide-and-sequential-minodronate-on-lumbar-spine-bone-mineral-density-and-microarchitecture-in-osteoporosis
#18
Daichi Miyaoka, Yasuo Imanishi, Masaya Ohara, Noriyuki Hayashi, Yuki Nagata, Shinsuke Yamada, Katsuhito Mori, Masanori Emoto, Masaaki Inaba
The trabecular bone score (TBS) is a new surrogate for trabecular bone microarchitecture assessment, independent of bone mineral density (BMD), calculated from pixel gray-level variations in the lumbar spine (LS) dual-energy X-ray absorptiometry (DXA) image. Although Teriparatide (TPTD) increased LS-BMD as well as TBS in 2 years, the precise time-course of these parameters was not well known. The aim of this study was to determine the changes in LS-BMD and the TBS in osteoporotic patients treated with TPTD, followed by minodronate (MINO)...
June 6, 2017: Calcified Tissue International
https://www.readbyqxmd.com/read/28547346/ketogenic-diet-compromises-both-cancellous-and-cortical-bone-mass-in-mice
#19
Xiuhua Wu, Zucheng Huang, Xiaomeng Wang, Zhaozong Fu, Junhao Liu, Zhiping Huang, Ganggang Kong, Xiaolin Xu, Jianyang Ding, Qingan Zhu
To clarify osteoporotic effects of ketogenic diet (KD) on cancellous and cortical bone compared with ovariectomy (OVX) in mice. Forty female C57BL/6J 8-week-old mice were randomly divided into SD+Sham, SD+OVX, KD+Sham, and KD+OVX groups, and fed for 12 weeks. The distal femur of trabecular bone and the middle femur of cortical bone were evaluated with Micro-CT scanning. The maximum bending force and stiffness of the tibia were calculated using a three-point bending test. Osteoblast and osteoclast expression of femur were identified using tartrate-resistant acid phosphatase (TRAP), collagen type I (CoLI), and osteocalcin (OCN) staining...
May 25, 2017: Calcified Tissue International
https://www.readbyqxmd.com/read/28536889/the-phenotype-of-patients-with-a-recent-fracture-a-literature-survey-of-the-fracture-liaison-service
#20
REVIEW
Lisanne Vranken, Caroline E Wyers, Joop P W van den Bergh, Piet P M M Geusens
The aetiology of fractures in patients aged 50 years and older is multifactorial, and includes bone- and fall-related risks. The Fracture Liaison Service (FLS) is recommended to identify patients with a recent fracture and to evaluate their subsequent fracture risk, in order to take measures to decrease the risk of subsequent fractures in patients with a high risk phenotype. A literature survey was conducted to describe components of the bone- and fall-related phenotype of patients attending the FLS. Components of the patient phenotype at the FLS have been reported in 33 studies...
September 2017: Calcified Tissue International
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