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Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research

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https://www.readbyqxmd.com/read/28520221/rap1b-is-an-effector-of-axin2-regulating-crosstalk-of-signaling-pathways-during-skeletal-development
#1
Takamitsu Maruyama, Ming Jiang, Alycia Abbott, H-M Ivy Yu, Qirong Huang, Magdalena Chrzanowska-Wodnicka, Emily I Chen, Wei Hsu
Recent identification and isolation of suture stem cells capable of long term self-renewal, clonal expanding and differentiating demonstrate their essential role in calvarial bone development, homeostasis and injury repair. These bona fide stem cells express high level of Axin2 and are able to mediate bone regeneration and repair in a cell autonomous fashion. The importance of Axin2 is further demonstrated by its genetic inactivation in mice causing skeletal deformities resembling craniosynostosis in humans...
May 18, 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/28520214/mtorc1-inhibits-nf-%C3%AE%C2%BAb-nfatc1-signaling-and-prevents-osteoclast-precursor-differentiation-in-vitro-and-in-mice
#2
Yue Zhang, Song Xu, Kai Li, Kang Tan, Kangyan Liang, Jian Wang, Junhui Shen, Wenchong Zou, Le Hu, Daozhang Cai, Changhai Ding, Mangmang Li, Guozhi Xiao, Bin Liu, Anling Liu, Xiaochun Bai
The mechanistic target of rapamycin complex 1 (mTORC1) is a critical sensor for bone homeostasis and bone formation; however, the role of mTORC1 in osteoclast development and the underlying mechanisms have not yet been fully established. Here, we found that mTORC1 activity declined during osteoclast precursors differentiation in vitro and in vivo. We further targeted deletion of Raptor (mTORC1 key component) or Tsc1 (mTORC1 negative regulator) to constitutively inhibit or activate mTORC1 in osteoclast precursors (monocytes/macrophages), using LyzM-cre mice...
May 18, 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/28513888/pain-quality-of-life-and-safety-outcomes-of-kyphoplasty-for-vertebral-compression-fractures-report-of-a-task-force-of-the-american-society-for-bone-and-mineral-research
#3
A J Rodriguez, H A Fink, L Mirigian, N Guañabens, R Eastell, K Akesson, D C Bauer, P R Ebeling
The relative efficacy and harms of balloon kyphoplasty (BK) for treating vertebral compression fractures (VCF) are uncertain. We searched multiple electronic databases to March 2016 for randomised and quasi-randomised controlled trials comparing BK with control treatment (non-surgical management [NSM], percutaneous vertebroplasty [PV], KIVA®, vertebral body stenting, or other) in adults with VCF. Outcomes included back pain, back disability, quality of life (QoL), new VCF and adverse events (AE). One reviewer extracted data, a second checked accuracy, and two rated risk of bias (ROB)...
May 17, 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/28498616/tethering-formation-to-resorption-reversal-revisited
#4
David W Dempster
In 1964, Harold Frost and colleagues ((1)) deduced the sequence of cellular events in the bone remodeling cycle based on the seminal observation that the vast majority (97%) of osteons in adult human bone are formed over scalloped cement lines indicating that resorption precedes formation. The cement lines joining the newly formed bone to the older bone were therefore correctly designated as reversal lines. This article is protected by copyright. All rights reserved.
May 12, 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/28488734/body-size-and-the-risk-of-primary-hyperparathyroidism-in-women-a-cohort-study
#5
Anand Vaidya, Gary C Curhan, Julie M Paik, Molin Wang, Eric N Taylor
Greater body weight and fat mass have been associated with higher serum parathyroid hormone levels and a higher prevalence of primary hyperparathyroidism (P-HPTH) in women. However, prospective studies to evaluate whether greater body size associates with a higher incidence of developing P-HPTH have not been reported. We investigated whether greater body size was independently associated with a higher risk for developing P-HPTH in women. We conducted a prospective cohort study of 85,013 female participants in the Nurses' Health Study I followed for up to 26 years...
May 10, 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/28477420/the-lrp4-r1170q-homozygous-knock-in-mouse-recapitulates-the-bone-phenotype-of-sclerosteosis-in-humans
#6
Eveline Boudin, Timur Yorgan, Igor Fijalkowski, Stephan Sonntag, Ellen Steenackers, Gretl Hendrickx, Silke Peeters, Annelies De Maré, Benjamin Vervaet, Anja Verhulst, Geert Mortier, Patrick D'Haese, Thorsten Schinke, Wim Van Hul
Sclerosteosis is a rare autosomal recessive bone disorder marked by hyperostosis of the skull and tubular bones. Initially, we and others reported that sclerosteosis was caused by loss-of-function mutations in SOST, encoding sclerostin. More recently, we identified disease causing mutations in LRP4, a binding partner of sclerostin, in three Sclerosteosis patients. Upon binding to sclerostin, LRP4 can inhibit the canonical WNT signaling which is known to be an important pathway in the regulation of bone formation...
May 6, 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/28474780/the-effect-of-abaloparatide-sc-on-fracture-risk-is-independent-of-baseline-frax-fracture-probability-a-post-hoc-analysis-of-the-active-study
#7
McCloskey Ev, Johansson H, Oden A, Harvey Nc, Jiang H, Modin S, L Fitzpatrick, Kanis J A
Daily subcutaneous (SC) injections of the investigational drug abaloparatide-SC (80mcg) for 18 months significantly decrease the risk of vertebral and non-vertebral fracture compared with placebo in postmenopausal women. We examined the efficacy of abaloparatide-SC as a function of baseline fracture risk, assessed using the FRAX tool. Baseline clinical risk factors (age, BMI, prior fracture, glucocorticoid use, rheumatoid arthritis, and smoking) were entered into country-specific FRAX models to calculate the 10-year probability of major osteoporotic fractures, with or without femoral neck BMD...
May 5, 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/28470757/osteocytes-acidify-their-microenvironment-in-response-to-pthrp-in-vitro-and-in-lactating-mice-in-vivo
#8
Katharina Jähn, Shilpa Kelkar, Hong Zhao, Yixia Xie, LeAnn M Tiede-Lewis, Vladimir Dusevich, Sarah L Dallas, Lynda F Bonewald
Osteocytes appear to mobilize calcium within minutes in response to PTH injections and we have previously shown that osteocytes remove their perilacunar matrix during lactation through activation of the PTH type 1 receptor. Mechanisms utilized by osteocytes to mobilize calcium are unknown but we hypothesized that the molecular components may be similar to those used by osteoclasts. Here we show, using IDG-SW3 cells that ATP6V0D2, an essential component of vacuolar ATPase in osteoclasts, and other genes associated with osteoclastic bone resorption increase with osteoblast to osteocyte differentiation...
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/28470721/hox11-function-is-required-for-region-specific-fracture-repair
#9
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/28467663/screening-for-atypical-femur-fractures-using-extended-femur-scans-by-dxa
#10
Denise M van de Laarschot, Alexandra A A Smits, Sanne K C Buitendijk, Merel T Stegenga, M Carola Zillikens
Atypical femur fractures (AFFs) are a rare but serious complication associated with the use of antiresorptive drugs such as bisphosphonates. Assessment of incomplete AFFs on extended femur scans by Dual X-ray Absorptiometry (DXA) may prevent the development of complete fractures. The aim of this study was to evaluate the potential of extended femur scans by DXA as a screening tool for incomplete AFFs. From June 2014 until September 2016 extended femur scans were routinely performed in all consecutive patients undergoing DXA scanning who had used bisphosphonates or denosumab at any given moment in the previous year...
May 3, 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/28467646/intermittent-parathyroid-hormone-after-prolonged-alendronate-treatment-induces-substantial-new-bone-formation-and-increases-bone-tissue-heterogeneity-in-ovariectomized-rats
#11
Allison R Altman-Singles, Yonghoon Jeong, Wei-Ju Tseng, Chantal M J de Bakker, Hongbo Zhao, Carina Lott, Juhanna Robberts, Ling Qin, Lin Han, Do-Gyoon Kim, X Sherry Liu
Postmenopausal osteoporosis is often treated with bisphosphonates (e.g. alendronate, ALN), but over-suppression of bone turnover by long-term bisphosphonate treatment may decrease bone tissue heterogeneity. Thus, alternate treatment strategies after long-term bisphosphonates are of great clinical interest. The objective of the current study is to determine the effect of intermittent parathyroid hormone (PTH) following 12 weeks of alendronate (ALN, a bisphosphonate) treatment in 6-month-old, ovariectomized (OVX) rats on bone microarchitecture, bone remodeling dynamics, and bone mechanical properties at multiple length scales...
May 3, 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/28460152/leisure-time-physical-activity-and-risk-of-fracture-a-cohort-study-of-66-940-men-and-women
#12
Karl Stattin, Karl Michaëlsson, Susanna C Larsson, Alicja Wolk, Liisa Byberg
Physical activity has been associated with reduced risk of fracture, but it is not known how the intensity or frequency of physical activity influences this risk reduction. We aim to compare the risk of hip fracture and fracture of any locale between men and women with different levels of leisure-time walking/bicycling and exercise. A total of 37,238 women (born 1914-1948) from the Swedish Mammography Cohort and 45,906 men (born 1918-1952) from the Cohort of Swedish Men were followed for a maximum of 17 years...
April 29, 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/28459498/octreotide-is-ineffective-in-treating-tumor-induced-osteomalacia-results-of-a-short-term-therapy
#13
Diana Ovejero, Diala El-Maouche, Beth A Brillante, Azar Khosravi, Rachel I Gafni, Michael T Collins
Tumor-induced osteomalacia (TIO) is a rare paraneoplastic syndrome in which unregulated hypersecretion of fibroblast growth factor 23 (FGF23) by phosphaturic mesenchymal tumors (PMT) causes renal phosphate wasting, hypophosphatemia, and osteomalacia. The resulting mineral homeostasis abnormalities and skeletal manifestations can be reversed with surgical resection of the tumor. Unfortunately, PMTs are often difficult to locate, and medical treatment with oral phosphate and vitamin D analogues is either insufficient to manage the disease or not tolerated...
April 29, 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/28436105/exercise-decreases-marrow-adipose-tissue-through-%C3%A3-oxidation-in-obese-running-mice
#14
Maya Styner, Gabriel M Pagnotti, Cody McGrath, Xin Wu, Buer Sen, Gunes Uzer, Zhihui Xie, Xiaopeng Zong, Martin A Styner, Clinton T Rubin, Janet Rubin
The relationship between marrow adipose tissue (MAT) and bone health is poorly understood. We used running exercise to ask whether obesity-associated MAT can be attenuated via exercise and whether this correlates with gains in bone quantity and quality. C57BL/6 mice were divided into diet-induced obesity (DIO, n = 14) versus low-fat diet (LFD, n = 14). After 3 months, 16-week-old mice were allocated to an exercise intervention (LFD-E, DIO-E) or a control group (LFD, DIO) for 6 weeks (4 groups, n = 7/group)...
April 24, 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/28430378/treating-paget-s-disease-why-and-how-much
#15
Tim Cundy
Paget's disease (PDB) is a benign chronic focal disorder of older people. Affected bones have greatly accelerated bone turnover, a chaotic structure and are highly vascular. People with PDB are commonly asymtomatic but can also suffer chronic bone pain. Affected bones may become enlarged and deformed; and they are also liable to fracture. This article is protected by copyright. All rights reserved.
April 21, 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/28425624/a-statistical-approach-to-fine-mapping-for-the-identification-of-potential-causal-variants-related-to-bone-mineral-density
#16
Jonathan Greenbaum, Hong-Wen Deng
Although GWAS have been able to successfully identify dozens of genetic loci associated with bone mineral density (BMD) and osteoporosis related traits, very few of these loci have been confirmed to be causal. This is due to the fact that in a given genetic region there may exist many trait-associated SNPs that are highly correlated. While this correlation is useful for discovering novel associations, the high degree of linkage disequilibrium that persists throughout the genome presents a major challenge to discern which among these correlated variants has a direct effect on the trait...
April 20, 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/28425622/targeted-disruption-of-nf1-in-osteocyte-increases-fgf23-and-osteoid-with-osteomalacia-like-bone-phenotype
#17
Nobuhiro Kamiya, Ryosuke Yamaguchi, Olumide Aruwajoye, Audrey Kim, Gen Kuroyanagi, Matthew Phipps, Naga Suresh Adapala, Jian Q Feng, Harry K W Kim
Neurofibromatosis type 1 (NF1, OMIM 162200), caused by NF1 gene mutations, exhibits multi-system abnormalities including skeletal deformities in humans. Osteocytes play critical roles in controlling bone modeling and remodeling. However, the role of neurofibromin, the protein product of the NF1 gene, in osteocytes is largely unknown. This study investigated the role of neurofibromin in osteocytes by disrupting Nf1 under the Dmp1-promoter. The conditional knockout (Nf1 cKO) mice displayed serum profile of a metabolic bone disorder with an osteomalacia-like bone phenotype...
April 20, 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/28425620/periarticular-bone-loss-in-arthritis-is-induced-by-autoantibodies-against-citrullinated-vimentin
#18
Cecilia Engdahl, Holger Bang, Katharina Dietel, Stefanie C Lang, Ulrike Harre, Georg Schett
Periarticular bone loss is a long known but yet insufficiently understood phenomenon in patients with rheumatoid arthritis. This study investigated whether autoimmunity against citrullinated proteins is causally involved in triggering periarticular bone loss. Periarticular bone loss was studied in the standard antigen induced arthritis (AIA) mouse model with methylated bovine serum albumin (mBSA) as well as modified model with mutated citrullinated vimentin (MCV) alone or in combination with mBSA. Periarticular bone loss, subchondral osteoclastogenesis as well as local expression of cytokines, osteoclast genes and PAD enzymes were assessed after arthritis induction...
April 20, 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/28425581/clinical-biochemical-and-genetic-features-of-41-han-chinese-families-with-primary-hypertrophic-osteoarthropathy-and-their-therapeutic-response-to-etoricoxib-results-from-a-6-months-prospective-clinical-intervention
#19
Shan-Shan Li, Jin-We He, Wen-Zhen Fu, Yu-Juan Liu, Yun-Qiu Hu, Zhen-Lin Zhang
Primary hypertrophic osteoarthropathy (PHO) is a rare inherited disease caused by genetic defects in prostaglandin metabolism pathway; disturbed prostaglandin E2 (PGE2 ) catabolism resulting in increased PGE2 levels is suggested in the pathogenesis. Forty-three Han Chinese patients with PHO were studied and 41 of them were treated. Mutations in HPGD gene, causing hypertrophic osteoarthropathy, primary, autosomal recessive 1 (PHOAR1; OMIM 259100), were identified in 7 patients, and mutations in SLCO2A1 gene, causing hypertrophic osteoarthropathy, primary, autosomal recessive 2 (PHOAR2; OMIM 614441), were identified in 36 patients...
April 20, 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
https://www.readbyqxmd.com/read/28419547/perinatal-dna-methylation-at-cdkn2a-is-associated-with-offspring-bone-mass-findings-from-the-southampton-women-s-survey
#20
Elizabeth M Curtis, Robert Murray, Philip Titcombe, Eloïse Cook, Rebecca Clarke-Harris, Paula Costello, Emma Garratt, Joanna D Holbrook, Sheila Barton, Hazel Inskip, Keith M Godfrey, Christopher G Bell, Cyrus Cooper, Karen A Lillycrop, Nicholas C Harvey
Poor intrauterine and childhood growth has been linked with the risk of osteoporosis in later life, a relationship which may in part be mediated through altered epigenetic regulation of genes. We previously identified a region within the promoter of the long non-coding RNA ANRIL encoded by the CDKN2A locus, at which differential DNA methylation at birth showed correlations with offspring adiposity. Given the common lineage of adipocytes and osteoblasts, we investigated the relationship between perinatal CDKN2A methylation and bone mass at ages 4 and 6 years...
April 17, 2017: Journal of Bone and Mineral Research: the Official Journal of the American Society for Bone and Mineral Research
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