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https://www.readbyqxmd.com/read/28534995/low%C3%A2-level-mechanical-vibration-enhances-osteoblastogenesis-via-a-canonical-wnt-signaling%C3%A2-associated-mechanism
#1
Heqi Gao, Mingming Zhai, Pan Wang, Xuhui Zhang, Jing Cai, Xiaofei Chen, Guanghao Shen, Erping Luo, Da Jing
Osteoporosis is a skeletal metabolic disease characterized by reduced bone mass and a high susceptibility to fractures, in which osteoblasts and osteoclasts are highly involved in the abnormal bone remodeling processes. Recently, low‑magnitude, high‑frequency whole‑body vibration has been demonstrated to significantly reduce osteopenia experimentally and clinically. However, the underlying mechanism regarding how osteoblastic activity is altered when bone tissues adapt to mechanical vibration remains elusive...
May 19, 2017: Molecular Medicine Reports
https://www.readbyqxmd.com/read/28531321/cortical-bone-size-deficit-in-adult-patients-with-type-1-diabetes-mellitus
#2
Charlotte Verroken, Wout Pieters, Loïc Beddeleem, Stefan Goemaere, Hans-Georg Zmierczak, Samyah Shadid, Jean-Marc Kaufman, Bruno Lapauw
CONTEXT: The increased fracture risk associated with type 1 diabetes mellitus (T1DM) remains unexplained by traditional risk factors such as low areal bone mineral density (aBMD). Nonetheless, few data exist on other determinants of bone strength in T1DM, including volumetric BMD (vBMD) and bone geometry. OBJECTIVE: We compared areal and volumetric bone parameters and cortical bone geometry in adult T1DM patients and gender- and age-matched controls. DESIGN: Cross-sectional study including 64 adult T1DM patients (38 men, 41...
May 22, 2017: Journal of Clinical Endocrinology and Metabolism
https://www.readbyqxmd.com/read/28527581/nuclear-receptors-in-skeletal-homeostasis
#3
Hao Zuo, Yihong Wan
Nuclear receptors are a family of transcription factors that can be activated by lipophilic ligands. They are fundamental regulators of development, reproduction, and energy metabolism. In bone, nuclear receptors enable bone cells, including osteoblasts, osteoclasts, and osteocytes, to sense their dynamic microenvironment and maintain normal bone development and remodeling. Our views of the molecular mechanisms in this process have advanced greatly in the past decade. Drugs targeting nuclear receptors are widely used in the clinic for treating patients with bone disorders such as osteoporosis by modulating bone formation and resorption rates...
2017: Current Topics in Developmental Biology
https://www.readbyqxmd.com/read/28517958/distance-of-translation-as-a-predictor-of-failure-of-fixation-in-paediatric-supracondylar-fractures
#4
P Holland, A Highcock, C Bruce
INTRODUCTION This study investigates the influence of incomplete reduction of supracondylar fractures on the incidence of loss of reduction requiring reoperation MATERIALS AND METHODS A review of 107 consecutive patients presenting with supracondylar fractures treated with closed reduction and Kirschner wire stabilisation, between January 2011 and March 2013, was conducted. The mean age was 5 years (range 10 months to 12 years). Pre-, intra- and postoperative radiographs were reviewed. All patients who had failure of fixation requiring revision surgery were identified...
May 18, 2017: Annals of the Royal College of Surgeons of England
https://www.readbyqxmd.com/read/28515495/the-failure-envelope-concept-applied-to-the-bone-dental-implant-system
#5
R Korabi, K Shemtov-Yona, A Dorogoy, D Rittel
Dental implants interact with the jawbone through their common interface. While the implant is an inert structure, the jawbone is a living one that reacts to mechanical stimuli. Setting aside mechanical failure considerations of the implant, the bone is the main component to be addressed. With most failure criteria being expressed in terms of stress or strain values, their fulfillment can mean structural flow or fracture. However, in addition to those effects, the bony structure is likely to react biologically to the applied loads by dissolution or remodeling, so that additional (strain-based) criteria must be taken into account...
May 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28507534/stress-and-alterations-in-bones-an-interdisciplinary-perspective
#6
REVIEW
Pia-Maria Wippert, Michael Rector, Gisela Kuhn, Karin Wuertz-Kozak
Decades of research have demonstrated that physical stress (PS) stimulates bone remodeling and affects bone structure and function through complex mechanotransduction mechanisms. Recent research has laid ground to the hypothesis that mental stress (MS) also influences bone biology, eventually leading to osteoporosis and increased bone fracture risk. These effects are likely exerted by modulation of hypothalamic-pituitary-adrenal axis activity, resulting in an altered release of growth hormones, glucocorticoids and cytokines, as demonstrated in human and animal studies...
2017: Frontiers in Endocrinology
https://www.readbyqxmd.com/read/28499311/evaluation-of-bone-mineral-density-in-children-with-type-i-diabetes-mellitus-and-relationship-to-serum-levels-of-osteopontin
#7
Forough Saki, Abdolkarim Sheikhi, Gholam Hosein Ranjbar Omrani, Hamid Karimi, Mohammad Hossein Dabbaghmanesh, Seyed Nouraddin Mousavinasab
Type I diabetes mellitus (T1DM) patients are at risk of osteoporosis and fracture due to the osteoblast and osteoclast malfunction. Osteopontin (OPN) as the major non-collagenous bone matrix protein is produced by osteoblasts and osteoclasts and involve in bone resorption, formation and remodeling. To evaluate the serum levels of OPN, bone mineral density (BMD) and correlation in patients with T1DM this study was designed. In this case-control study, 87 children with T1DM and 87 age/sex-matched healthy subjects were enrolled...
May 12, 2017: Drug Research
https://www.readbyqxmd.com/read/28497212/renal-osteodystrophy-or-kidney-induced-osteoporosis
#8
REVIEW
Sharon M Moe
PURPOSE OF REVIEW: Chronic kidney disease (CKD) affects nearly 10% of the population. The incidence of fractures in population studies demonstrate an increase with worsening stages of kidney disease suggesting specific CKD related causes of fracture. RECENT FINDINGS: The increase in fractures with CKD most likely represents disordered bone quality due to the abnormal bone remodeling from renal osteodystrophy. There is also an increase in fractures with age in patients with CKD, suggesting that patients with CKD also have many fracture risk factors common to patients without known CKD...
May 11, 2017: Current Osteoporosis Reports
https://www.readbyqxmd.com/read/28496203/common-variants-in-opg-confer-risk-to-bone-mineral-density-variation-and-osteoporosis-fractures
#9
Xiaoyong Sheng, Guangyong Cai, Xingjun Gong, Zouying Yao, Ye Zhu
Although many common variants have been identified for bone mineral density (BMD) and osteoporosis fractures, all the identified risk variants could only explain a small portion of heritability of BMD and osteoporosis fractures. OPG belongs to the tumor necrosis factor receptor superfamily, which plays a crucial role in bone remodeling and is thus a promising candidate gene of osteoporosis. Several studies have explored the association of OPG variants with BMD or osteoporosis fractures, however, the results remain inconsistent among different populations...
May 11, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28486640/generalized-metabolic-bone-disease-and-fracture-risk-in-rothmund-thomson-syndrome
#10
Felicia Cao, Linchao Lu, Steven A Abrams, Keli M Hawthorne, Allison Tam, Weidong Jin, Brian Dawson, Roman Shypailo, Hao Liu, Brendan Lee, Sandesh Cs Nagamani, Lisa L Wang
Rothmund-Thomson syndrome (RTS) is a rare autosomal recessive disorder characterized by poikiloderma, small stature, sparse hair, skeletal abnormalities, increased risk of osteosarcoma, and decreased bone mass. To date, there has not been a comprehensive evaluation of the prevalence and extent of metabolic bone disease in RTS. Furthermore, the mechanisms that result in this phenotype are largely unknown. In this report, we provide a detailed evaluation of 29 individuals with RTS with respect to their metabolic bone status including bone mineral density, calcium kinetics studies, and markers of bone remodeling...
May 9, 2017: Human Molecular Genetics
https://www.readbyqxmd.com/read/28472361/energy-metabolism-of-the-osteoblast-implications-for-osteoporosis
#11
Wen-Chih Lee, Anyonya R Guntur, Fanxin Long, Clifford J Rosen
Osteoblasts, the bone forming cells of the remodeling unit, are essential for growth and maintenance of the skeleton. Clinical disorders of substrate availability (e.g. diabetes mellitus, anorexia nervosa and aging) cause osteoblast dysfunction ultimately leading to skeletal fragility and osteoporotic fractures. Conversely, anabolic treatments for osteoporosis enhance the work of the osteoblast by altering osteoblast metabolism. Emerging evidence supports glycolysis as the major metabolic pathway to meet ATP demand during osteoblast differentiation...
May 1, 2017: Endocrine Reviews
https://www.readbyqxmd.com/read/28470721/hox11-function-is-required-for-region-specific-fracture-repair
#12
Danielle R Rux, Jane Y Song, Kyriel M Pineault, Gurjit S Mandair, Ilea T Swinehart, Aleesa J Schlientz, Kayla N Garthus, Steve A Goldstein, Ken M Kozloff, Deneen M Wellik
The processes that govern fracture repair rely on many mechanisms that recapitulate embryonic skeletal development. Hox genes are transcription factors that perform critical patterning functions in regional domains along the axial and limb skeleton during development. Much less is known about roles for these genes in the adult skeleton. We recently reported that Hox11 genes, which function in zeugopod development (radius/ulna and tibia/fibula), are also expressed in the adult zeugopod skeleton exclusively in PDGFRα + /CD51 + /LepR+ mesenchymal stem/stromal cells (MSCs)...
May 4, 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/28467589/a-comparison-of-the-effects-of-platelet-rich-plasma-and-demineralized-bone-matrix-on-critical-bone-defects-an-experimental-study-on-rats
#13
Egemen Turhan, Mustafa Kemal Akça, Ahmet Bayar, Murat Songür, Selçuk Keser, Mahmut Nedim Doral
BACKGROUND: Delayed union of fractured bone is one of the main problems of orthopedics and traumatology practice. It was hypothesized that the beneficial effects of allogeneic platelet-rich plasma (PRP) would be valuable in the treatment of segmental bone defects. This study is a comparison of the effects of demineralized bone matrix (DBM) and PRP in a segmental bone defect model. METHODS: Total of 48 Wistar albino rats were separated into 4 groups. Segmental bone defect was created at right radius diaphysis in all specimens using dorsal approach...
March 2017: Ulusal Travma Ve Acil Cerrahi Dergisi, Turkish Journal of Trauma & Emergency Surgery: TJTES
https://www.readbyqxmd.com/read/28460421/calreticulin-inhibits-inflammation-induced-osteoclastogenesis-and-bone-resorption
#14
Charla R Fischer, Maya Mikami, Hiroshi Minematsu, Saqib Nizami, Heon Goo Lee, Danielle Stamer, Neel Patel, Do Yu Soung, Jung-Ho Back, Lee Song, Hicham Drissi, Francis Y Lee
Osteoclasts play key roles in bone remodeling and pathologic osteolytic disorders such as inflammation, infection, bone implant loosening, rheumatoid arthritis, metastatic bone cancers, and pathological fractures. Osteoclasts are formed by the fusion of monocytes in response to receptor activators of NF-ĸB-ligand (RANKL) and macrophage colony stimulating factor 1 (M-CSF). Calreticulin (CRT), a commonly known intracellular protein as a calcium-binding chaperone, has an unexpectedly robust anti-osteoclastogenic effect when its recombinant form is applied to osteoclast precursors in vitro or at the site of bone inflammation externally in vivo...
April 29, 2017: Journal of Orthopaedic Research: Official Publication of the Orthopaedic Research Society
https://www.readbyqxmd.com/read/28458516/profile-of-romosozumab-and-its-potential-in-the-management-of-osteoporosis
#15
REVIEW
Sian Yik Lim, Marcy B Bolster
Increased understanding of bone biology has led to the discovery of several unique signaling pathways that regulate bone formation and resorption. The Wnt signaling pathway plays a significant role in skeletal development, adult skeletal homeostasis, and bone remodeling. Sclerostin is an inhibitor of the Wnt signaling pathway. Romosozumab, a humanized monoclonal antibody that binds to sclerostin, prevents sclerostin from exerting this inhibitory effect. Therefore, in the presence of romosozumab, the Wnt signaling pathway is activated leading to bone formation and bone mineral density gain...
2017: Drug Design, Development and Therapy
https://www.readbyqxmd.com/read/28450214/omics-analysis-of-human-bone-to-identify-genes-and-molecular-networks-regulating-skeletal-remodeling-in-health-and-disease
#16
REVIEW
Sjur Reppe, Harish K Datta, Kaare M Gautvik
The skeleton is a metabolically active organ throughout life where specific bone cell activity and paracrine/endocrine factors regulate its morphogenesis and remodeling. In recent years, an increasing number of reports have used multi-omics technologies to characterize subsets of bone biological molecular networks. The skeleton is affected by primary and secondary disease, lifestyle and many drugs. Therefore, to obtain relevant and reliable data from well characterized patient and control cohorts are vital...
April 24, 2017: Bone
https://www.readbyqxmd.com/read/28447127/bone-adaptation-of-a-biologically-reconstructed-femur-after-ewing-sarcoma-long-term-morphological-and-densitometric-evolution
#17
Giordano Valente, Fulvia Taddei, Andrea Roncari, Enrico Schileo, Marco Manfrini
Combining bone allografts and vascularized fibular autografts in intercalary reconstructions after resection of bone sarcomas is of particular interest in young patients as it facilitates bone healing and union and helps reduce fractures. However, adverse events related to bone adaptation still occur. Bone adaptation is driven by mechanical loading, but no quantitative biomechanical studies exist that would help surgical planning and rehabilitation. We analyzed the bone adaptation of a successful femoral reconstruction after Ewing sarcoma during 76-month follow-up using a novel methodology that allows CT-based quantification of morphology and density...
April 26, 2017: Skeletal Radiology
https://www.readbyqxmd.com/read/28443253/bone-modeling-remodeling-and-skeletal-health-in-children-and-adolescents-mineral-accrual-assessment-and-treatment
#18
REVIEW
Chiara Maggioli, Stefano Stagi
The modeling and remodeling process of the bone is fundamental to maintaining its integrity and mechanical properties. Many physical and biochemical factors during childhood and adolescence are crucially important for the development of healthy bones. Systemic conditions, such as hormonal status, nutrition, physical inactivity, or many pharmacological treatments, as well as a local variation in the load, can influence bone turnover and, consequently, the attainment of a proper peak bone mass. However, many diseases affecting children and adolescents can be associated with a reduction in bone accrual or a loss of bone mass and quality, which leads to an increased risk of fracture over one's life...
March 2017: Annals of Pediatric Endocrinology & Metabolism
https://www.readbyqxmd.com/read/28434032/diabetes-bone-and-glucose-lowering-agents-basic-biology
#19
REVIEW
Beata Lecka-Czernik
Skeletal fragility often accompanies diabetes and does not appear to correlate with low bone mass or trauma severity in individuals with diabetes. Instead (and in contrast to those with osteoporotic bone disease), bone remodelling and bone turnover are compromised in both type 1 and type 2 diabetes, contributing to defective bone material quality. This review is one of a pair discussing the relationship between diabetes, bone and glucose-lowering agents; an accompanying review is provided in this issue of Diabetologia by Ann Schwartz (DOI: 10...
April 22, 2017: Diabetologia
https://www.readbyqxmd.com/read/28432379/high-resolution-tomography-based-quantification-of-cortical-porosity-and-cortical-thickness-at-the-surgical-neck-of-the-humerus-during-aging
#20
Tobias Helfen, Christoph M Sprecher, Ursula Eberli, Boyko Gueorguiev, Peter E Müller, Robert G Richards, Florian Schmidutz
Fractures of the proximal humerus are highly related to age and osteoporotic bone remodeling. Previous studies have highlighted the cortex as a major side of the bone loss, but the microstructural changes of the humerus have not been evaluated entirely. Sixty-four (n = 64) humeri of a representative collective (18-100 years) were scanned with high-resolution peripheral quantitative computed tomography (82 µm). Bone mineral density (BMD), trabecular bone volume fraction (Tb.BV/TV), cortical thickness (Ct...
April 21, 2017: Calcified Tissue International
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