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https://www.readbyqxmd.com/read/27919734/microdamage-induced-by-in-vivo-reference-point-indentation-in-mice-is-repaired-by-osteocyte-apoptosis-mediated-remodeling
#1
Oran D Kennedy, Matin Lendhey, Peter Mauer, Anaya Philip, Jelena Basta-Pljakic, Mitchell B Schaffler
Reference Point Indentation (RPI) is a technology that is designed to measure mechanical properties that relate to bone toughness, or its ability to resist crack growth, in vivo. Independent of the mechanical parameters generated by RPI, its ability to initiate and propagate microcracks in bone is itself an interesting issue. Microcracks have a crucial biological relevance in bone, are central to its ability to maintain homeostasis. In healthy tissues, a process of targeted remodeling routinely repairs microcracks in a process mediated by osteocyte apoptosis...
December 2, 2016: Bone
https://www.readbyqxmd.com/read/27914925/erratum-to-pharmaceutical-and-clinical-development-of-phosphonate-based-radiopharmaceuticals-for-the-targeted-treatment-of-bone-metastases-bone-91-2016-159-179
#2
Rogier Lange, Rob Ter Heine, Russ Ff Knapp, John M H de Klerk, Haiko J Bloemendal, Harry N Hendrikse
No abstract text is available yet for this article.
November 30, 2016: Bone
https://www.readbyqxmd.com/read/27913271/histone-deacetylases-hdac-in-physiological-and-pathological-bone-remodelling
#3
REVIEW
M D Cantley, A C W Zannettino, P M Bartold, D P Fairlie, D R Haynes
Histone deacetylases (HDACs)(2) play important roles in the epigenetic regulation of gene expression in cells and are emerging therapeutic targets for treating a wide range of diseases. HDAC inhibitors (HDACi)(3) that act on multiple HDAC enzymes have been used clinically to treat a number of solid and hematological malignancies. HDACi are currently being studied also for their efficacy in non-malignant diseases, including pathologic bone loss, but this has necessitated a better understanding of the roles of individual HDAC enzymes, particularly the eleven zinc-containing isozymes...
November 29, 2016: Bone
https://www.readbyqxmd.com/read/27913134/corrigendum-to-sglt2-inhibitor-therapy-improves-blood-glucose-but-does-not-prevent-diabetic-bone-disease-in-diabetic-dba-2j-male-mice-bone-82-2016-101-107
#4
Kathryn M Thrailkill, R C Bunn, Jeffry S Nyman, Mallikarjuna R Rettiganti, Gael E Cockrell, Elizabeth C Wahl, Sasidhar Uppuganti, Charles K Lumpkin, John L Fowlkes
No abstract text is available yet for this article.
November 29, 2016: Bone
https://www.readbyqxmd.com/read/27894941/one-year-of-abaloparatide-a-selective-peptide-activator-of-the-pth1-receptor-increased-bone-mass-and-strength-in-ovariectomized-rats
#5
Aurore Varela, Luc Chouinard, Elisabeth Lesage, Robert Guldberg, Susan Y Smith, Paul J Kostenuik, Gary Hattersley
Abaloparatide is a novel 34 amino acid peptide selected to be a potent and selective activator of the parathyroid hormone receptor 1 (PTHR1) signaling pathway. The effects of 12months of abaloparatide treatment on bone mass, bone strength and bone quality was assessed in osteopenic ovariectomized (OVX) rats. SD rats were subjected to OVX or sham surgery at 6months of age and left untreated for 3months to allow OVX-induced bone loss. Eighteen OVX rats were sacrificed after this bone depletion period, and the remaining OVX rats received daily s...
November 25, 2016: Bone
https://www.readbyqxmd.com/read/27890549/novel-functions-of-circulating-klotho
#6
REVIEW
Julia M Hum, Linda O'Bryan, Rosamund C Smith, Kenneth E White
A significant portion of the key biological functions of αKlotho (αKL) and its cognate ligand Fibroblast growth factor-23 (FGF23) have been revealed through the study of rare diseases of mineral metabolism. These findings have far reaching implications for common disorders such as chronic kidney disease-mineral bone disorder (CKD-MBD). αKL's predominant effect on mineral homeostasis is through its actions in the kidney as a co-receptor for FGF23, however emerging data has shed light on its capacity to act as a circulating factor through the cleavage of the transmembrane form of αKL ('mKL') to produce 'cleaved KL' or 'cKL'...
November 23, 2016: Bone
https://www.readbyqxmd.com/read/27890548/use-of-glucose-lowering-drugs-and-risk-of-fracture-in-patients-with-type-2-diabetes
#7
Jakob Starup-Linde, Søren Gregersen, Morten Frost, Peter Vestergaard
BACKGROUND: Diabetes mellitus is associated with an increased risk of hip fracture. The aim of this cohort study was to investigate whether glucose-lowering drugs influence the risk of hip fracture in patients with incident diabetes. METHODS: A study was performed on a cohort of patients with incident type 2 diabetes. Diabetes diagnosis was defined using information from the Danish National Patient Registry and reimbursement information of glucose-lowering drugs from the Register of Medicinal Product Statistics...
November 23, 2016: Bone
https://www.readbyqxmd.com/read/27888056/sclerostin-expression-and-functions-beyond-the-osteocyte
#8
Megan M Weivoda, Stephanie J Youssef, Merry Jo Oursler
Sclerostin, the product of the SOST gene, is a secreted inhibitor of Wnt signaling that is produced by osteocytes to regulate bone formation. While it is often considered an osteocyte-specific protein, SOST expression has been reported in numerous other cell types, including hypertrophic chondrocytes and cementocytes. Of interest, SOST/sclerostin expression is altered in certain pathogenic conditions, including osteoarthritis and rheumatic joint disease, and it is unclear whether sclerostin plays a protective role or whether sclerostin may mediate disease pathogenesis...
November 23, 2016: Bone
https://www.readbyqxmd.com/read/27884787/loss-of-cbl-pi3k-interaction-modulates-the-periosteal-response-to-fracture-by-enhancing-osteogenic-commitment-and-differentiation
#9
Vanessa Scanlon, Bhavita Walia, Jungeun Yu, Marc Hansen, Hicham Drissi, Peter Maye, Archana Sanjay
The periosteum contains multipotent skeletal progenitors that contribute to bone repair. The signaling pathways regulating the response of periosteal cells to fracture are largely unknown. Phosphatidylinositol-3 Kinase (PI3K), a prominent lipid kinase, is a major signaling protein downstream of several factors that regulate osteoblast differentiation. Cbl is an E3 ubiquitin ligase and a major adaptor protein that binds to the p85 regulatory subunit and modulates PI3K activity. Substitution of tyrosine 737 to phenylalanine (Y737F) in Cbl abolishes the interaction between Cbl and p85 subunit without affecting the Cbl's ubiquitin ligase function...
November 22, 2016: Bone
https://www.readbyqxmd.com/read/27884786/osteopontin-and-the-dento-osseous-pathobiology-of-x-linked-hypophosphatemia
#10
Tchilalo Boukpessi, Betty Hoac, Benjamin R Coyac, Thibaut Leger, Camille Garcia, Philippe Wicart, Michael P Whyte, Francis H Glorieux, Agnès Linglart, Catherine Chaussain, Marc D McKee
Seven young patients with X-linked hypophosphatemia (XLH, having inactivating PHEX mutations) were discovered to accumulate osteopontin (OPN) at the sites of defective bone mineralization near osteocytes - the so-called hallmark periosteocytic (lacunar) "halos" of XLH. OPN was also localized in the pericanalicular matrix extending beyond the osteocyte lacunae, as well as in the hypomineralized matrix of tooth dentin. OPN, a potent inhibitor of mineralization normally degraded by PHEX, is a member of a family of acidic, phosphorylated, calcium-binding, extracellular matrix proteins known to regulate dental, skeletal, and pathologic mineralization...
November 21, 2016: Bone
https://www.readbyqxmd.com/read/27876503/cranio-caudal-asymmetries-in-trabecular-architecture-reflect-vertebral-fracture-patterns
#11
Ge Yang, Michele C Battié, Steven K Boyd, Tapio Videman, Yue Wang
Clinically, vertebral fractures often occur in the upper lumbar spine and involve the superior endplate of a vertebra (which is immediately caudal to a disc). Knowledge that the cranial endplate of a disc is thicker and has greater bone mineral density (BMD) than the corresponding caudal endplate helps to explain this phenomenon. In this study, we investigated structural differences in vertebral trabeculae on either side of a lumbar disc to provide further insight into vertebral fracture risk. As the focus is trabecular difference within a spinal motion segment, we define cranial and caudal vertebral trabeculae relative to the disc...
November 19, 2016: Bone
https://www.readbyqxmd.com/read/27871909/histone-deacetylase-inhibition-enhances-in-vivo-bone-regeneration-induced-by-human-periodontal-ligament-cells
#12
Nam Cong-Nhat Huynh, Vincent Everts, Akira Nifuji, Prasit Pavasant, Ruchanee Salingcarnboriboon Ampornaramveth
: Periodontal ligament cells have the potential to differentiate into bone forming osteoblasts and thus represent a good cellular candidate for bone regeneration. This study aimed to investigate the effect of inhibition of histone deacetylases, using the inhibitor Trichostatin A (TSA), on bone regeneration by human periodontal ligament cells (hPDLCs) in a mouse calvaria bone defect. METHODS: RUNX2 protein and its acetylation was analyzed by immunoprecipitation and western blotting...
November 18, 2016: Bone
https://www.readbyqxmd.com/read/27866994/corrigendum-to-genome-wide-association-study-in-east-asians-suggests-uhmk1-as-a-novel-bone-mineral-density-susceptibility-gene
#13
Hyung Jin Choi, Hyojung Park, Lei Zhang, Jung Hee Kim, Ye An Kim, Jae-Yeon Yang, Yu-Fang Pei, Qing Tian, Hui Shen, Joo-Yeon Hwang, Hong-Wen Deng, Nam H Cho, Chan Soo Shin
No abstract text is available yet for this article.
November 17, 2016: Bone
https://www.readbyqxmd.com/read/27866993/micrornas-223-3p-and-93-5p-in-patients-with-chronic-kidney-disease-before-and-after-renal-transplantation
#14
M Ulbing, A H Kirsch, B Leber, S Lemesch, J Münzker, N Schweighofer, D Hofer, O Trummer, A R Rosenkranz, H Müller, K Eller, V Stadlbauer, B Obermayer-Pietsch
Chronic kidney disease (CKD) is associated with a multifactorial dysregulation of bone and vascular calcification and closely linked to increased cardiovascular mortality and concomitant bone disease. We aimed to investigate specific microRNA (miRNA) signatures in CKD patients to find indicators for vascular calcification and/or bone mineralization changes during CKD and after kidney transplantation (KT). A miRNA array was used to investigate serum miRNA profiles in CKD patients, then selected miRNAs were quantified in a validation cohort comprising 73 patients in CKD stages 3 to 5, 67 CKD patients after KT, and 36 healthy controls...
November 17, 2016: Bone
https://www.readbyqxmd.com/read/27871812/effects-of-roux-en-y-gastric-bypass-and-sleeve-gastrectomy-on-bone-mineral-density-and-marrow-adipose-tissue
#15
Miriam A Bredella, Logan B Greenblatt, Alireza Eajazi, Martin Torriani, Elaine W Yu
Bariatric surgery is associated with bone loss but skeletal consequences may differ between Roux-en-Y gastric bypass (RYGB) and sleeve gastrectomy (SG), the two most commonly performed bariatric procedures. Furthermore, severe weight loss is associated with high marrow adipose tissue (MAT); however, MAT is also increased in visceral adiposity. The purpose of our study was to determine the effects of RYGB and SG on BMD and MAT. We hypothesized that both bariatric procedures would lead to a decrease in BMD and MAT...
November 15, 2016: Bone
https://www.readbyqxmd.com/read/27856358/p2x7rs-are-involved-in-cell-death-growth-and-cellular-signaling-in-primary-human-osteoblasts
#16
Ankita Agrawal, Zanne Henriksen, Susanne Syberg, Solveig Petersen, Derya Aslan, Marie Solgaard, Nis Nissen, Tommy Korsgaard Larsen, Peter Schwarz, Thomas H Steinberg, Niklas Rye Jørgensen
The ionotropic ATP-gated P2X7 receptor (P2X7R) is involved in the regulation of many physiological functions including bone metabolism. Several studies on osteoblasts from rodents and human osteoblast-like cell lines have addressed the expression and function of P2X7R on these bone-forming cells however; its role in human primary osteoblasts has not yet been reported. The aim of this study was to assess the expression of the P2X7R in bone marrow-derived stromal cells and in primary human trabecular osteoblasts and to determine the function in bone formation and cell signaling...
November 14, 2016: Bone
https://www.readbyqxmd.com/read/27847255/fgf23-%C3%AE-klotho-as-a-paradigm-for-a-kidney-bone-network
#17
REVIEW
Makoto Kuro-O, Orson W Moe
The vertebrate endoskeleton is not a mere frame for muscle attachment to facilitate locomotion, but is a massive organ integrated with many physiologic functions including mineral and energy metabolism. Mineral balance is maintained by tightly controlled ion fluxes that are external (intestine and kidney) and internal (between bone and other organs), and are regulated and coordinated by many endocrine signals between these organs. The endocrine fibroblast growth factors (FGFs) and Klotho gene families are complex systems that co-evolved with the endoskeleton...
November 12, 2016: Bone
https://www.readbyqxmd.com/read/27847254/vascular-calcification-in-ckd-mbd-roles-for-phosphate-fgf23-and-klotho
#18
REVIEW
Shunsuke Yamada, Cecilia M Giachelli
Vascular calcification (VC) is highly prevalent in aging, diabetes mellitus, and chronic kidney disease (CKD). VC is a strong predictor of cardiovascular morbidity and mortality in the CKD population. Complex pathological mechanisms are involved in the development of VC, including osteochondrogenic differentiation and apoptosis of vascular smooth muscle cells, instability and release of extracellular vesicles loaded calcium and phosphate, and elastin degradation. Elevated serum phosphate is a late manifestation of CKD, and has been shown to accelerate mineral deposition in both the vessel wall and heart valves...
November 12, 2016: Bone
https://www.readbyqxmd.com/read/27845263/osteoclastogenic-capacity-of-peripheral-blood-mononuclear-cells-is-not-different-between-women-with-and-without-osteoporosis
#19
W N H Koek, B C J van der Eerden, R D A M Alves, M van Driel, M Schreuders-Koedam, M C Zillikens, J P T M van Leeuwen
INTRODUCTION: Peripheral Blood Mononuclear Cells (PBMCs) have been extensively used as a culture model to generate osteoclasts in vitro. The aim of this study was to assess the osteoclastogenic potential of PBMCs derived from post-menopausal women with longstanding osteoporosis and compare this with PBMCs from healthy controls. MATERIAL AND METHODS: We selected from the population-based Rotterdam Study 82 participants of which 43 were diagnosed with osteoporosis (T-score below -2...
November 12, 2016: Bone
https://www.readbyqxmd.com/read/27845262/effect-of-pubertal-suppression-and-cross-sex-hormone-therapy-on-bone-turnover-markers-and-bone-mineral-apparent-density-bmad-in-transgender-adolescents
#20
Mariska C Vlot, Daniel T Klink, Martin den Heijer, Marinus A Blankenstein, Joost Rotteveel, Annemieke C Heijboer
Puberty is highly important for the accumulation of bone mass. Bone turnover and bone mineral density (BMD) can be affected in transgender adolescents when puberty is suppressed by gonadotropin-releasing hormone analogues (GnRHa), followed by treatment with cross-sex hormone therapy (CSHT). We aimed to investigate the effect of GnRHa and CSHT on bone turnover markers (BTMs) and bone mineral apparent density (BMAD) in transgender adolescents. Gender dysphoria was diagnosed based on diagnostic criteria according to the DSM-IV (TR)...
November 11, 2016: Bone
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