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https://www.readbyqxmd.com/read/28429547/the-use-of-bone-turnover-markers-in-chronic-kidney-disease-mineral-and-bone-disorders
#1
Cherie Chiang
Bone turnover markers assist in fracture risk prediction, management and monitoring of osteoporosis in patients without chronic kidney disease (CKD). The use in CKD-mineral bone disorder (MBD) has been limited as many of these markers and breakdown products are renally excreted, including the most commonly used and well standardized procollagen type I N propeptide and C-terminal cross-linking telopeptide of type I collagen. Of the markers unaffected by renal function, bone specific alkaline phosphatase is associated with mortality and fracture rate in CKD subjects and is now available on several automated analysers...
March 2017: Nephrology
https://www.readbyqxmd.com/read/28429052/the-skeletal-impact-of-the-chemotherapeutic-agent-etoposide
#2
A J Koh, B P Sinder, P Entezami, L Nilsson, L K McCauley
Effects of the chemotherapeutic agent etoposide on the skeleton were determined in mice. Numbers of bone marrow cells were reduced and myeloid cells were increased. Bone volume was significantly decreased with signs of inhibition of bone formation. Etoposide after pre-treatment with zoledronic acid still reduced bone but overall bone volume was higher than with etoposide alone. INTRODUCTION: Chemotherapeutics target rapidly dividing tumor cells yet also impact hematopoietic and immune cells in an off target manner...
April 20, 2017: Osteoporosis International
https://www.readbyqxmd.com/read/28428609/socket-preservation
#3
L Fee
Socket preservation maintains bone volume post-extraction in anticipation of an implant placement or fixed partial denture pontic site. This procedure helps compensate for the resorption of the facial bone wall. Socket preservation should be considered when implant placement needs to be delayed for patient or site-related reasons. The ideal healing time before implant placement is six months. Socket preservation can reduce the need for later bone augmentation. By reducing bone resorption and accelerating bone formation it increases implant success and survival...
April 21, 2017: British Dental Journal
https://www.readbyqxmd.com/read/28428481/serum-tartrate-resistant-acid-phosphatase-5b-levels-are-associated-with-the-severity-and-extent-of-coronary-atherosclerosis-in-patients-with-coronary-artery-disease
#4
Taichirou Morisawa, Akihiro Nakagomi, Keiichi Kohashi, Yoshiki Kusama, Wataru Shimizu
AIMS: Tartrate-resistant acid phosphatase (TRACP)-5b and osteoprotegerin (OPG) are specific and sensitive markers of bone resorption in patients with rheumatoid arthritis (RA) and chronic kidney disease (CKD). The TRACP-5b level is associated with the severity of RA and CKD, while the OPG level is associated with the severity of coronary atherosclerosis and calcification, and can predict a poor outcome in patients with coronary artery disease (CAD). However, the impact of TRACP-5b on coronary atherosclerosis in CAD patients remains unclear...
April 19, 2017: Journal of Atherosclerosis and Thrombosis
https://www.readbyqxmd.com/read/28428078/kinetic-reconstruction-reveals-time-dependent-effects-of-romosozumab-on-bone-formation-and-osteoblast-function-in-vertebral-cancellous-and-cortical-bone-in-cynomolgus-monkeys
#5
Rogely Waite Boyce, Qing-Tian Niu, Michael S Ominsky
Romosozumab, a humanized monoclonal sclerostin antibody under development for the treatment of osteoporosis, has a unique mechanism of action on bone-increasing bone formation and decreasing bone resorption. The effects on bone formation are transient, eliciting a rapid increase in bone formation that attenuates with continued treatment. Although bone formation attenuates, bone mineral density (BMD) continues to increase. To explore potential tissue-level mechanisms that could contribute to a progressive increase in spine BMD, we used kinetic reconstruction techniques to examine the effects of romosozumab on modeling and remodeling units in vertebral cancellous bone from adult cynomolgus monkeys administered romosozumab for 10 and 28weeks...
April 18, 2017: Bone
https://www.readbyqxmd.com/read/28427810/synthesis-of-novel-5-6-dehydrokawain-analogs-as-osteogenic-inducers-and-their-action-mechanisms
#6
Momochika Kumagai, Keisuke Nishikawa, Takashi Mishima, Izumi Yoshida, Masahiro Ide, Keiko Koizumi, Munetomo Nakamura, Yoshiki Morimoto
An imbalance between bone resorption by osteoclasts and bone formation by osteoblasts can cause bone loss and bone-related disease. In a previous search for natural products that increase osteogenic activity, we found that 5,6-dehydrokawain (1) from Alpinia zerumbet promotes osteoblastogenesis. In this study, we synthesized and evaluated series of 5,6-dehydrokawain analogs. Our structure-activity relationships revealed that alkylation of para or meta position of aromatic ring of 1 promote osteogenic activity...
April 6, 2017: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/28427808/rapid-microwave-accelerated-synthesis-and-anti-osteoporosis-activities-evaluation-of-morusin-scaffolds-and-morusignin-l-scaffolds
#7
Bing Lin, Jun-Fei Huang, Xiong-Wei Liu, Xi-Tao Ma, Xiong-Li Liu, Yi Lu, Ying Zhou, Feng-Min Guo, Ting-Ting Feng
Described herein is a facile and efficient methodology toward the synthesis of Morusin scaffolds and Morusignin L scaffolds 4-9 and 12via a novel three-step approach (Michael addition or prenylation, cyclization and cyclization) and use a rapid, microwave-accelerated cyclization as the key step. Furthermore, their biological activities have been preliminarily demonstrated by in vitro evaluation for anti-osteoporosis activity. These Morusin, Morusignin L and newly synthesized compounds 5b, 6a, 8e, 8f greatly exhibited the highest potency, especially at the 10(-5)mol/L (P<0...
April 9, 2017: Bioorganic & Medicinal Chemistry Letters
https://www.readbyqxmd.com/read/28427342/intermittent-parathyroid-hormone-pth-promotes-cementogenesis-and-alleviates-the-catabolic-effects-of-mechanical-strain-in-cementoblasts
#8
Yuyu Li, Zhiai Hu, Chenchen Zhou, Yang Xu, Li Huang, Xin Wang, Shujuan Zou
BACKGROUND: External root resorption, commonly starting from cementum, is a severe side effect of orthodontic treatment. In this pathological process and repairing course followed, cementoblasts play a significant role. Previous studies implicated that parathyroid hormone (PTH) could act on committed osteoblast precursors to promote differentiation, and inhibit apoptosis. But little was known about the role of PTH in cementoblasts. The purpose of this study was to investigate the effects of intermittent PTH on cementoblasts and its influence after mechanical strain treatment...
April 20, 2017: BMC Cell Biology
https://www.readbyqxmd.com/read/28427101/tanshinol-alleviates-osteoporosis-and-myopathy-in-glucocorticoid-treated-rats
#9
Guanghua Chen, Xinle Zhang, Han Lin, Guizhi Huang, Yahui Chen, Liao Cui
Tanshinol is a major water-soluble active component of Salvia miltiorrhiza. In this study, we aimed to investigate whether tanshinol has potential therapeutic effects against glucocorticoid-induced osteoporosis and glucocorticoid-induced myopathy. Ninety-six female Sprague-Dawley rats were randomly assigned to five groups: a control group, a model group, and three model groups treated with 25 or 50 mg/kg of tanshinol, or calcitriol. All model groups received prednisone acetate for 90 days to induce glucocorticoid-induced osteoporosis...
April 20, 2017: Planta Medica
https://www.readbyqxmd.com/read/28426756/excessive-dietary-intake-of-vitamin-a-reduces-skull-bone-thickness-in-mice
#10
Thomas Lind, Caroline Öhman, Gabriela Calounova, Annica Rasmusson, Göran Andersson, Gunnar Pejler, Håkan Melhus
Calvarial thinning and skull bone defects have been reported in infants with hypervitaminosis A. These findings have also been described in humans, mice and zebrafish with loss-of-function mutations in the enzyme CYP26B1 that degrades retinoic acid (RA), the active metabolite of vitamin A, indicating that these effects are indeed caused by too high levels of vitamin A and that evolutionary conserved mechanisms are involved. To explore these mechanisms, we have fed young mice excessive doses of vitamin A for one week and then analyzed the skull bones using micro computed tomography, histomorphometry, histology and immunohistochemistry...
2017: PloS One
https://www.readbyqxmd.com/read/28424660/ccl2-monocyte-chemoattractant-protein-1-and-parathyroid-hormone-action-on-bone
#11
REVIEW
Jawed Akhtar Siddiqui, Nicola C Partridge
Chemokines are small molecules that play a crucial role as chemoattractants for several cell types, and their components are associated with host immune responses and repair mechanisms. Chemokines selectively recruit monocytes, neutrophils, and lymphocytes and induce chemotaxis through the activation of G protein-coupled receptors. Two well-described chemokine families (CXC and CC) are known to regulate the localization and trafficking of immune cells in cases of injury, infection, and tumors. Monocyte chemoattractant protein 1 (MCP-1/CCL2) is one of the important chemokines from the CC family that controls migration and infiltration of monocytes/macrophages during inflammation...
2017: Frontiers in Endocrinology
https://www.readbyqxmd.com/read/28422326/alveolar-ridge-dimensional-changes-following-ridge-preservation-procedure-with-novel-devices-part-3-histological-analysis-in-non-human-primate-model
#12
Yingying Su, Jianxia Tang, Seiko Min, Lijia Guo, Yitong Liu, Yilin Xie, Jimin Xiong, Songlin Wang, Mauricio G Araújo, Homayoun H Zadeh, Yi Liu
OBJECTIVES: This study sought to investigate the histological changes following tooth extraction, ridge preservation and augmentation, using novel devices designed to obturate the oral orifice of extraction sockets (SocketKAP™) and provide structural support for sockets with defective bony walls (SocketKAGE™) in a non-human primate model. MATERIAL AND METHODS: Six Macaca fascicularis were imaged by cone beam computed tomography to register their preoperative alveolar bone...
April 19, 2017: Clinical Oral Implants Research
https://www.readbyqxmd.com/read/28422064/dried-plums-prunes-and-bone-health-a-comprehensive-review
#13
REVIEW
Taylor C Wallace
The 2015-2020 Dietary Guidelines for Americans advocate for increasing fruit intake and replacing energy-dense foods with those that are nutrient-dense. Nutrition across the lifespan is pivotal for the healthy development and maintenance of bone. The National Osteoporosis Foundation estimates that over half of Americans age 50+ have either osteoporosis or low bone mass. Dried plums, also commonly referred to as prunes, have a unique nutrient and dietary bioactive profile and are suggested to exert beneficial effects on bone...
April 19, 2017: Nutrients
https://www.readbyqxmd.com/read/28421873/facial-alveolar-bone-width-at-the-first-and-second-maxillary-premolars-in-healthy-patients-a-cone-beam-computed-tomography-study
#14
Julio Rojo, José Viña, David Peñarrocha, Miguel Peñarrocha
The purpose was to analyze the thickness of the facial alveolar bone at the first and second maxillary premolars and determinate the percentage of premolars that reached 2 mm in width. A retrospective study analyzing cone beam computed tomography scans from the database of the Oral Surgery Unit of the University of Valencia was performed. Patients with periodontal disease, orthodontic treatment, absence among the first maxillary molars, premolars with endodontic treatment and/or prosthetic restorations were excluded...
April 19, 2017: Journal of Oral Implantology
https://www.readbyqxmd.com/read/28421466/parathyroid-diseases-and-t-cells
#15
REVIEW
M Neale Weitzmann, Roberto Pacifici
PURPOSE OF REVIEW: This review summarizes studies into the permissive role of T cells in the bone catabolic effects of hyperparathyroidism and parathyroid hormone (PTH). RECENT FINDINGS: Work in animals combined with recent translational studies in humans now highlight the potent amplificatory action of T cells on PTH-induced bone resorption. Mechanistic animal studies reveal a complex pathway by which PTH exploits natural self-renewal functions of CD4(+) T cells, to drive TNFα production that promotes formation of IL-17A secreting Th17 T cells...
April 18, 2017: Current Osteoporosis Reports
https://www.readbyqxmd.com/read/28420708/activation-of-the-p2y2-receptor-regulates-bone-cell-function-by-enhancing-atp-release
#16
Isabel R Orriss, Dilek Gueneri, Mark Or Hajjawi, Kristy Shaw, Jessal J Patel, Tim R Arnett
Bone cells constitutively release ATP into the extracellular environment where it acts locally via P2 receptors to regulate bone cell function. Whilst P2Y2 receptor stimulation regulates bone mineralisation the functional effects of this receptor in osteoclasts remain unknown. This investigation used the P2Y2 receptor knockout (P2Y2R(-/-) ) mouse model to investigate the role of this receptor in bone. MicroCT analysis of P2Y2R(-/-) mice demonstrated age-related increases in trabecular bone volume (≤48%), number (≤30%) and thickness (≤17%)...
April 18, 2017: Journal of Endocrinology
https://www.readbyqxmd.com/read/28418093/hypoxia-inducible-factor-1-alpha-does-not-regulate-osteoclastogenesis-but-enhances-bone-resorption-activity-via-prolyl-4-hydroxylase-2
#17
Philippa A Hulley, Tammie Bishop, Aude Vernet, Jurgen E Schneider, James R Edwards, Nick A Athanasou, Helen J Knowles
Osteogenic-angiogenic coupling is promoted by the Hypoxia-Inducible Factor 1-alpha (HIF-1α) transcription factor, provoking interest in HIF activation as a therapeutic strategy to improve osteoblast mineralisation and treat pathological osteolysis. However, HIF also enhances the bone resorbing activity of mature osteoclasts. It is therefore essential to determine the full effect(s) of HIF on both the formation and bone-resorbing function of osteoclasts in order to understand how they might respond to such a strategy...
April 18, 2017: Journal of Pathology
https://www.readbyqxmd.com/read/28416991/can-denosumab-be-a-substitute-competitor-or-complement-to-bisphosphonates
#18
REVIEW
Su Young Kim, Hwoe Gyeong Ok, Christof Birkenmaier, Kyung Hoon Kim
Osteoblasts, originating from mesenchymal cells, make the receptor activator of the nuclear factor kappa B ligand (RANKL) and osteoprotegerin (OPG) in order to control differentiation of activated osteoclasts, originating from hematopoietic stem cells. When the RANKL binds to the RANK of the pre-osteoclasts or mature osteoclasts, bone resorption increases. On the contrary, when OPG binds to the RANK, bone resorption decreases. Denosumab (AMG 162), like OPG (a decoy receptor), binds to the RANKL, and reduces binding between the RANK and the RANKL resulting in inhibition of osteoclastogenesis and reduction of bone resorption...
April 2017: Korean Journal of Pain
https://www.readbyqxmd.com/read/28414795/negative-feedback-loop-of-bone-resorption-by-nfatc1-dependent-induction-of-cadm1
#19
Shinya Nakamura, Takuma Koyama, Naohiro Izawa, Seitaro Nomura, Takanori Fujita, Yasunori Omata, Takashi Minami, Morio Matsumoto, Masaya Nakamura, Eriko Fujita-Jimbo, Takashi Momoi, Takeshi Miyamoto, Hiroyuki Aburatani, Sakae Tanaka
Trimethylation of histone H3 lysine 4 and lysine 27 (H3K4me3 and H3K27me3) at gene promoter regions critically regulates gene expression. Key developmental genes tend to exhibit changes in histone modification patterns from the H3K4me3/H3K27me3 bivalent pattern to the H3K4me3 monovalent pattern. Using comprehensive chromatin immunoprecipitation followed by sequencing in bone marrow-derived macrophages (BMMs) and mature osteoclasts, we found that cell surface adhesion molecule 1 (Cadm1) is a direct target of nuclear factor of activated T cells 1 (NFATc1) and exhibits a bivalent histone pattern in BMMs and a monovalent pattern in osteoclasts...
2017: PloS One
https://www.readbyqxmd.com/read/28414140/shear-stress-inhibits-il-17a-mediated-induction-of-osteoclastogenesis-via-osteocyte-pathways
#20
Chongshan Liao, Tianfan Cheng, Shuai Wang, Chengfei Zhang, Lijian Jin, Yanqi Yang
Interleukin (IL)-17 is crucial to osteoclast differentiation and activation. Osteocytes support osteoclast formation and are thought to orchestrate bone remodeling in response to fluid flow. The contribution of IL-17 to osteocyte-related bone resorption remains unclear. Here, we used the osteocyte-like MLO-Y4 cell line to examine the role of IL-17 and fluid flow in osteoclastogenesis. It was the first time to demonstrate that IL-17A promoted MLO-Y4 cell proliferation, enhanced expression of receptor activator of nuclear factor κ-B ligand (RANKL) and tumor necrosis factor-α (TNF-α), and induced osteoclastogenesis when MLO-Y4 cells were co-cultured with bone marrow-derived macrophage (BMM) cells...
April 14, 2017: Bone
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