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https://www.readbyqxmd.com/read/27920805/abaloparatide
#1
REVIEW
Stefano Gonnelli, Carla Caffarelli
Abaloparatide is an investigational analog of human PTHrP (1-34) being developed for the treatment of osteoporosis. The amino-acid sequence of abaloparatide is identical to that of PTHrP in the first 20 amino-acids, while over half of the remaining amino-acids are different. Some studies in animals and in humans reported that abaloparatide presented a potent anabolic activity with reduced effects on bone resorption as compared to that observed with teriparatide. This may be due to a more transient signaling response of abaloparatide related to differing affinities of the two drugs to the specific conformations of the PTH1 receptor...
May 2016: Clinical Cases in Mineral and Bone Metabolism
https://www.readbyqxmd.com/read/27920208/genetic-modification-of-er-hoxb8-osteoclast-precursors-using-crispr-cas9-as-a-novel-way-to-allow-studies-on-osteoclast-biology
#2
Irene Di Ceglie, Guus G H van den Akker, Giuliana Ascone, Bas Ten Harkel, Hans Häcker, Fons A J van de Loo, Marije I Koenders, Peter M van der Kraan, Teun J de Vries, Thomas Vogl, Johannes Roth, Peter L E M van Lent
Osteoclasts are cells specialized in bone resorption. Currently, studies on murine osteoclasts are primarily performed on bone marrow-derived cells with the use of many animals and limited cells available. ER-Hoxb8 cells are conditionally immortalized monocyte/macrophage murine progenitor cells, recently described to be able to differentiate toward functional osteoclasts. Here, we produced an ER-Hoxb8 clonal cell line from C57BL/6 bone marrow cells that strongly resembles phenotype and function of the conventional bone marrow-derived osteoclasts...
December 5, 2016: Journal of Leukocyte Biology
https://www.readbyqxmd.com/read/27919827/pkc%C3%AE-ii-mediated-cross-talk-of-trpv1-cb2-modulates-the-glucocorticoid-induced-osteoclast-overactivity
#3
Giulia Bellini, Marco Torella, Iolanda Manzo, Chiara Tortora, Livio Luongo, Francesca Punzo, Nicola Colacurci, Bruno Nobili, Sabatino Maione, Francesca Rossi
In this study, we investigated the role of the endovanilloid/endocannabinoid system in the glucocorticoid-induced osteoclast overactivity. Receptorial and enzymatic component of the endovanilloid/endocannabinoid system are expressed in bone cells, and dysregulated when bone mass is reduced. Moreover, blockade or desensitization of vanilloid receptor 1 (TRPV1) and/or stimulation of cannabinoid receptor 2 (CB2) are beneficial for reducing number and activity of the bone cells modulating resorption, the osteoclasts...
December 2, 2016: Pharmacological Research: the Official Journal of the Italian Pharmacological Society
https://www.readbyqxmd.com/read/27919752/bioavailable-25-oh-d-but-not-total-25-oh-d-is-an-independent-determinant-for-bone-mineral-density-in-chinese-postmenopausal-women
#4
Chenguang Li, Peizhan Chen, Xiaohua Duan, Jing Wang, Bing Shu, Xiaoguang Li, Qian Ba, Jingquan Li, Yongjun Wang, Hui Wang
Total 25(OH)D levels were determined to assess bone health in elderly populations; however, the bioavailability of 25(OH)D is regulated by the albumin and vitamin D binding protein (DBP) levels and DBP variations. Whether bioavailable 25(OH)D level is a superior biomarker for vitamin D than total 25(OH)D level regarding the BMD and the bone metabolism were not yet fully understood. With a community based cross-sectional study of 967 postmenopausal women, we found that the variant rs7041, but not rs4588, of DBP was significantly associated with the blood DBP level, which was positively correlated with the total 25(OH)D level but negatively associated with bioavailable 25(OH)D levels...
November 28, 2016: EBioMedicine
https://www.readbyqxmd.com/read/27919267/targeted-drug-delivery-of-near-ir-fluorescent-doxorubicin-conjugated-poly-ethylene-glycol-bisphosphonate-nanoparticles-for-diagnosis-and-therapy-of-primary-and-metastatic-bone-cancer-in-a-mouse-model
#5
S Rudnick-Glick, E Corem-Salkmon, I Grinberg, S Margel
BACKGROUND: Most primary and metastatic bone tumors demonstrate increased osteoclast activity and bone resorption. Current treatment is based on a combination of surgery, radiotherapy and chemotherapy. Severe side effects are associated with chemotherapy due to use of high dosage and nonspecific uptake. Bisphosphonates have a strong affinity to Ca(2+) ions and are widely used in the treatment of bone disorders. RESULTS: We have engineered a unique biodegradable bisphosphonate nanoparticle (NPs) bearing two functional surface groups: (1) primary amine groups for covalent attachment of a dye/drug (e...
December 5, 2016: Journal of Nanobiotechnology
https://www.readbyqxmd.com/read/27918745/simple-and-aneurysmal-bone-cyst-aspects-of-jaw-pseudocysts-based-on-an-experience-of-brazilian-pathology-service-during-53-years
#6
I Flores, M-E Hamilton, E-F Zanchin-Baldissera, A-C Uchoa-Vasconcelos, S-B Chaves-Tarquinio, A-P Neutzling-Gomes
BACKGROUND: Jaw pseudocysts are benign osseous lesions of unclear etiology. Among these, the simple bone cyst (SBC) and aneurysmal bone cyst (ABC) are intriguing bone pathologies still rarely studied together. This retrospective study aimed to present the long-term case series of patients with jaw pseudocysts focusing on the clinical, radiographic, and transoperative aspects. MATERIAL AND METHODS: A retrospective case series of patients with SBC and ABC was performed...
December 6, 2016: Medicina Oral, Patología Oral y Cirugía Bucal
https://www.readbyqxmd.com/read/27917278/the-preventive-and-therapeutic-roles-of-phytoestrogen-%C3%AE-zearalanol-on-osteoporetic-rats-due-to-ovariectomization
#7
Shaochun Li, Weiwei Zhang, Fei Duan, Weihua Liu, Xiaofang Sun, Xuefeng Pan
OBJECTIVES: The aim of this study was to observe the influence of phytoestrogen α-Zearalanol on ovariectomy-induced postmenopausal osteoporosis in rats. MATERIALS AND METHODS: 40 SD female rats were randomly divided into four groups: Sham group, OVX group (ovariectomized and fed estrogen), α-Zearalanol group (ovariectomized and fed α-Zearalanol) and untreated group (ovariectomized). Three weeks later after surgery, α-Zearalanol and estradiol valerate were administered by oral gavage for 12 weeks to the α-Zearalanol group and the OVX group, respectively...
November 2016: Iranian Journal of Basic Medical Sciences
https://www.readbyqxmd.com/read/27916903/combined-use-of-zoledronic-acid-augments-ursolic-acid-induced-apoptosis-in-human-osteosarcoma-cells-through-enhanced-oxidative-stress-and-autophagy
#8
Chia-Chieh Wu, Yi-Fu Huang, Chen-Pu Hsieh, Pin-Ju Chueh, Yao-Li Chen
Ursolic acid (UA), a naturally occurring pentacyclic triterpene acid found in many medicinal herbs and edible plants, triggers apoptosis in several tumor cell lines but not in human bone cancer cells. Most recently, we have demonstrated that UA exposure reduces the viability of human osteosarcoma MG-63 cells through enhanced oxidative stress and apoptosis. Interestingly, an inhibitor of osteoclast-mediated bone resorption, zoledronic acid (ZOL), also a third-generation nitrogen-containing bisphosphonate, is effective in the treatment of bone metastases in patients with various solid tumors...
November 30, 2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/27916560/thinning-of-articular-cartilage-after-joint-unloading-or-immobilization-an-experimental-investigation-of-the-pathogenesis-in-mice
#9
Masato Nomura, Naoyoshi Sakitani, Hiroyuki Iwasawa, Yuta Kohara, Shoko Takano, Yoshio Wakimoto, Hiroshi Kuroki, Hideki Moriyama
OBJECTIVE: Moderate mechanical stress generated by normal joint loading and movement is essential for the maintenance of healthy articular cartilage. However, the effects of reduced loading caused by the absence of weight bearing or joint motion on articular cartilage and subchondral bone is still poorly understood. We aimed to characterize morphological and metabolic responses of articular cartilage and subchondral bone to decreased mechanical stress in vivo. METHODS: Mice were subjected to periods of hindlimb unloading by tail suspension or external fixation of the knee joints...
December 1, 2016: Osteoarthritis and Cartilage
https://www.readbyqxmd.com/read/27915981/molecular-cellular-and-pharmaceutical-aspects-of-autologous-grafts-for-peri-implant-hard-and-soft-tissue-defects
#10
Jiayu Lu, Yongming Hao, Wei Zhao, Chengqi Lv, Derong Zou
The lack of supporting hard and soft tissues always prevents the rehabilitation with dental implants. Among various hard and soft tissue augmentation procedures, autologous grafts have been considered to be the gold standard. Autologous mesenchymal stem cells (MSCs) from bone marrow, dental tissue and adipose tissue have been described as promising alternatives for bone regeneration in the field of dental implantation. Mucosal cells, gingival fibroblasts and dental progenitor cells (DPS) can enhance peri-implant soft tissue augmentation and regenerate periodontal tissues around dental implants...
December 1, 2016: Current Pharmaceutical Biotechnology
https://www.readbyqxmd.com/read/27915435/bone-remodeling-and-regulating-biomarkers-in-women-at-the-time-of-breast-cancer-diagnosis
#11
Song Yao, Yali Zhang, Li Tang, Janise M Roh, Cecile A Laurent, Chi-Chen Hong, Theresa Hahn, Joan C Lo, Christine B Ambrosone, Lawrence H Kushi, Marilyn L Kwan
PURPOSE: The majority of breast cancer patients receive endocrine therapy, including aromatase inhibitors known to cause increased bone resorption. Bone-related biomarkers at the time of breast cancer diagnosis may predict future risk of osteoporosis and fracture after endocrine therapy. METHODS: In a large population of 2,401 female breast cancer patients who later underwent endocrine therapy, we measured two bone remodeling biomarkers, TRAP5b and BAP, and two bone regulating biomarkers, RANKL and OPG, in serum samples collected at the time of breast cancer diagnosis...
December 3, 2016: Breast Cancer Research and Treatment
https://www.readbyqxmd.com/read/27915374/long-term-functional-and-radiological-outcomes-of-allograft-hip-prosthesis-composite-a-fourteen%C3%A2-year-follow-up-study
#12
Arnaud Dubory, Eric Mascard, Méryl Dahan, Philippe Anract, Charles Court, Stéphane Boisgard, Brice Viard, Gilles Missenard
PURPOSE: Allograft hip composite prosthesis (APC) is a type of reconstruction after resection of the proximal femur. This study aimed to assess long-term outcomes after an APC reconstruction. MATERIALS AND METHODS: Forty-six patients were retrospectively included (14 revision total hip replacements, 30 primary malignant bone tumors, two metastasis). RESULTS: The mean length of femoral bone resection was 16.4 cm (7 to 27). With a mean follow-up of 14...
December 3, 2016: International Orthopaedics
https://www.readbyqxmd.com/read/27910838/hydrogen-substituted-%C3%AE-tricalcium-phosphate-synthesized-in-organic-media
#13
Christoph Stähli, Jürg Thüring, Laëtitia Galea, Solène Tadier, Marc Bohner, Nicola Döbelin
β-Tricalcium phosphate (β-TCP) platelets synthesized in ethylene glycol offer interesting geometries for nano-structured composite bone substitutes but were never crystallographically analyzed. In this study, powder X-ray diffraction and Rietveld refinement revealed a discrepancy between the platelet structure and the known β-TCP crystal model. In contrast, a model featuring partial H for Ca substitution and the inversion of P1O4 tetrahedra, adopted from the whitlockite structure, allowed for a refinement with minimal misfits and was corroborated by HPO4(2-) absorptions in Fourier-transform IR spectra...
December 1, 2016: Acta Crystallographica Section B, Structural Science, Crystal Engineering and Materials
https://www.readbyqxmd.com/read/27909781/the-ability-of-low-magnitude-mechanical-signals-to-normalize-bone-turnover-in-adolescents-hospitalized-for-anorexia-nervosa
#14
A D DiVasta, H A Feldman, C T Rubin, J S Gallagher, N Stokes, D P Kiel, B D Snyder, C M Gordon
: We sought to determine whether low-magnitude mechanical stimulation (LMMS) normalizes bone turnover among adolescents hospitalized for anorexia nervosa (AN). Brief, daily LMMS prevents the decline in bone turnover typically seen during bed rest in AN. LMMS may have application for patients with AN in the inpatient setting to protect bone health. INTRODUCTION: Malnourished adolescents with AN requiring medical hospitalization are at high risk for rapid reduction in skeletal quality...
December 1, 2016: Osteoporosis International
https://www.readbyqxmd.com/read/27908964/effects-of-the-etonogestrel-contraceptive-implant-implanon%C3%A2-on-bone-metabolism-during-lactation-a-prospective-study
#15
Candan Iltemir Duvan, Yuksel Onaran, Esra Aktepe Keskin, Ebru Yüce, Burcu Yanık, Hasan Kafali, Nilgun Ozturk Turhan
AIM: To evaluate the effects of the etonogestrel contraceptive implant (Implanon(®)) on bone metabolism in lactating women using markers for bone formation and resorption. STUDY DESIGN: This single-centre, prospective cohort study was conducted in Turgut Ozal University Medical Faculty Obstetrics and Gynecology Department with healthy lactating women aged between 24 and 38 years to compare the effect on bone metabolism of 6 months' use of either the implant or a non-hormonal contraceptive method...
December 1, 2016: Journal of Family Planning and Reproductive Health Care
https://www.readbyqxmd.com/read/27908549/noni-leaf-and-black-tea-enhance-bone-regeneration-in-estrogen-deficient-rats
#16
Nor Aijratul Asikin Mohd Shalan, Noordin M Mustapha, Suhaila Mohamed
OBJECTIVE: Black tea and Nonileaf are among the dietary compounds that can benefit patients with bone resorption disorders. Their bone regeneration effects and their mechanisms were studied in estrogen-deficient rats. METHODS: Noni leaves (three doses) and black tea water extracts were fed to ovariectomized rats for 4 mo, and their effects (analyzed via mechanical measurements, micro-computed tomography scan, and reverse transcriptase polymerase chain reaction mRNA) were compared with Remifemin (a commercial phytoestrogen product from black cohosh)...
January 2017: Nutrition
https://www.readbyqxmd.com/read/27905067/mathematical-model-of-bone-remodeling-captures-the-antiresorptive-and-anabolic-actions-of-various-therapies
#17
David S Ross, Khamir Mehta, Antonio Cabal
A better understanding of the molecular pathways regulating the bone remodeling process should help in the development of new antiresorptive regulators and anabolic regulators, that is, regulators of bone resorption and of bone formation. Understanding the mechanisms by which parathyroid hormone (PTH) influences bone formation and how it switches from anabolic to catabolic action is important for treating osteoporosis (Poole and Reeve in Curr Opin Pharmacol 5:612-617, 2005). In this paper we describe a mathematical model of bone remodeling that incorporates, extends, and integrates several models of particular aspects of this biochemical system (Cabal et al...
November 30, 2016: Bulletin of Mathematical Biology
https://www.readbyqxmd.com/read/27904825/can-acetazolamide-be-used-to-treat-diseases-involving-increased-bone-mineral-density
#18
Juan David González-Rodríguez, María Isabel Luis-Yanes, Esther Inglés-Torres, Pedro Arango-Sancho, José Eugenio Cabrera-Sevilla, María Rosario Duque-Fernández, Salvador Gil-Sánchez, Víctor Manuel García-Nieto
Sclerosing bone dysplasias are a series of clinically and genetically heterogeneous diseases characterized by functional failure of the osteoclasts in bone resorption, leading to an excessive amount of bone mineral density (BMD) which could have serious clinical consequences. We treated three children affected with seriously high levels of BMD with acetazolamide, with the intention of inducing metabolic acidosis, thus increasing bone resorption and reducing BMD. All our patients tolerated and followed the treatment well and the clinical response was satisfactory in all cases...
November 2016: Intractable & Rare Diseases Research
https://www.readbyqxmd.com/read/27904727/influence-of-early-bisphosphonate-administration-for-fracture-healing-in-patients-with-osteoporotic-proximal-humerus-fractures
#19
Joong-Bae Seo, Jae-Sung Yoo, Jee-Won Ryu, Kun-Woong Yu
BACKGROUND: Bisphosphonates are generally known to adversely affect fracture healing because they inhibit osteoclastic bone resorption. However, some authors argue that bisphosphonates have no adverse effect on the restoration of the mechanical integrity of long bones after fractures. It is unclear whether bisphosphonates can be initiated safely in patients with acute proximal humerus fractures. The aim of this study was to determine whether the early use of a bisphosphonate affects healing and outcomes of osteoporotic proximal humerus fractures treated with a locking compression plate...
December 2016: Clinics in Orthopedic Surgery
https://www.readbyqxmd.com/read/27903250/effectiveness-of-bovine-derived-xenograft-versus-bioactive-glass-with-periodontally-accelerated-osteogenic-orthodontics-in-adults-a-randomized-controlled-clinical-trial
#20
Maha A Bahammam
BACKGROUND: Periodontally accelerated osteogenic orthodontics (PAOO) combines periodontal therapy with orthodontic therapy, which minimises treatment time. This study compared the effectiveness of a bovine-derived xenograft with that of bioactive glass when combined with PAOO for the treatment of adult patients with moderate crowding of the teeth. METHODS: In this prospective, single-masked clinical trial, 33 orthodontic patients (20 women, 13 men; mean age 21.2 ± 1...
November 30, 2016: BMC Oral Health
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