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Bone biology

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https://www.readbyqxmd.com/read/29458123/osteocyte-regulation-of-bone-and-blood
#1
REVIEW
Paola Divieti Pajevic, Daniela S Krause
This past decade has witnessed a renewed interest in the function and biology of matrix-embedded osteocytes and these cells have emerged as master regulators of bone homeostasis. They secrete two very powerful proteins, sclerostin, a Wnt-inhibitor, that suppresses bone formation, and receptor-activator of NF-kB ligand (RANKL), a cytokine required for osteoclastogenesis. Neutralizing antibodies against these proteins are currently used for the treatment of osteoporosis. Recent studies however, ascribed yet another function to osteocytes: the control of hematopoiesis and the HSPC niche, directly and through secreted factors...
February 16, 2018: Bone
https://www.readbyqxmd.com/read/29457442/-development-and-application-of-artificial-vertebral-body
#2
REVIEW
Jian-Tao Liu, Feng Zhang, Zheng-Chao Gao, Bin-Bin Niu, Yu-Huan Li, Xi-Jing He
Artificial vertebral body has achieved good results in treating spinal tumors, tuberculosis, fracture and other diseases. Currently, artificial vertebral body with variety of kinds and pros and cons, is generally divided into two types: fusion type and movable type. The former according to whether the height could be adjusted and strength of self-stability is divided into three types: support-fixed type, adjust-fixed type and self-fixed type. Whether the height of self-fixed type could be adjusted is dependent on structure of collar thread rotation...
December 25, 2017: Zhongguo Gu Shang, China Journal of Orthopaedics and Traumatology
https://www.readbyqxmd.com/read/29454234/diarylheptanoid-from-rhizomes-of-curcuma-kwangsiensis-dck-inhibited-imiquimod-induced-dendritic-cells-activation-and-th1-th17-differentiation
#3
Qing Liu, Wei Yin, Ling Han, Jiaoyan Lv, Bingji Li, Yuli Lin, Qingsheng Mi, Rui He, Chuanjian Lu
BACKGROUND AND OBJECT: Dendritic cells (DCs) are critical for initiating the activation and differentiation of T cells in inflammatory diseases including psoriasis. Curcuma kwangsiensis S.G. Lee & C.F. Liang is a herb for treating psoriasis and we previously found Diarylheptanoid from rhizomes of Curcuma kwangsiensis (DCK) inhibited keratinocytes proliferation. However, it is unknown whether DCK influences DC functions. Thus we aimed to explore whether DCK affect the major immunological functions of DCs...
February 14, 2018: International Immunopharmacology
https://www.readbyqxmd.com/read/29454127/neurosurgery-on-a-pregnant-woman-with-post-mortem-fetal-extrusion-an-unusual-case-from-medieval-italy
#4
REVIEW
Alba Pasini, Vanessa Samantha Manzon, Xabier Gonzalez-Muro, Emanuela Gualdi-Russo
Trepanation is one of the most ancient and applied surgical treatments; several archaeologically documented cases are known, dated back from Prehistory to the Middle ages. This case study reports the anthropological analysis of the skeletal remains of a young medieval woman and a fetus (Imola, Italy). The fetal remains were laid between her pelvis and lower limbs. A perforating injury was observed to her frontal bone. After assessing biological profiles, we attempted to interpret the injury and to reconstruct possible circumstances of death...
February 14, 2018: World Neurosurgery
https://www.readbyqxmd.com/read/29454076/the-biological-basis-of-treating-jaw-discrepancies-an-interplay-of-mechanical-forces-and-skeletal-configuration
#5
REVIEW
Konstantinos Karamesinis, Efthimia K Basdra
Jaw discrepancies and malrelations affect a large proportion of the general population and their treatment is of utmost significance for individuals' health and quality of life. The aim of their therapy is the modification of aberrant jaw development mainly by targeting the growth potential of the mandibular condyle through its cartilage, and the architectural shape of alveolar bone through a suture type of structure, the periodontal ligament. This targeted treatment is achieved via external mechanical force application by using a wide variety of intraoral and extraoral appliances...
February 14, 2018: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/29453386/anti-fibrotic-effects-of-cxcr4-targeting-i-body-ad-114-in-preclinical-models-of-pulmonary-fibrosis
#6
K Griffiths, D M Habiel, J Jaffar, U Binder, W G Darby, C G Hosking, A Skerra, G P Westall, C M Hogaboam, M Foley
Idiopathic pulmonary fibrosis (IPF) is a chronic fibrotic lung disease that is prevalent in individuals >50 years of age, with a median survival of 3-5 years and limited therapeutic options. The disease is characterized by collagen deposition and remodeling of the lung parenchyma in a process that is thought to be driven by collagen-expressing immune and structural cells. The G-protein coupled C-X-C chemokine receptor 4, CXCR4, is a candidate therapeutic target for IPF owing to its role in the recruitment of CXCR4 + fibrocytes from the bone marrow to fibrotic lung tissue and its increased expression levels by structural cells in fibrotic lung tissue...
February 16, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29452987/cell-therapy-for-peripheral-artery-disease
#7
REVIEW
Nikolaos G Frangogiannis
Patients with severe peripheral artery disease (PAD) who are not candidates for revascularization have poor prognosis. Cell therapy using peripheral blood-derived or bone marrow-derived mononuclear cells, mesenchymal stem cells, or marker-specific subsets of bone marrow cells with angiogenic properties may hold promise for no-option PAD patients. Injected cells may exert beneficial actions by enhancing local angiogenesis (either through maturation of endothelial progenitors, or through secretion of angiogenic mediators), or by transducing cytoprotective signals that preserve tissue structure...
February 13, 2018: Current Opinion in Pharmacology
https://www.readbyqxmd.com/read/29452662/pathogenesis-of-follicular-lymphoma
#8
REVIEW
Tracy Lackraj, Rashmi Goswami, Robert Kridel
Follicular lymphoma (FL) is presented as a germinal centre B cell lymphoma that is characterized by an indolent clinical course, but remains - paradoxically - largely incurable to date. The last years have seen significant progress in our understanding of FL lymphomagenesis, which is a multi-step process beginning in the bone marrow with the hallmark t(14;18)(q32;q21) translocation. The pathobiology of FL is complex and combines broad somatic changes at the level of both the genome and the epigenome, the latter evidenced by highly recurrent mutations in chromatin-modifying genes such as KMT2D and CREBBP...
March 2018: Best Practice & Research. Clinical Haematology
https://www.readbyqxmd.com/read/29452282/load-sharing-through-elastic-micro-motion-accelerates-bone-formation-and-interbody-fusion
#9
Eric H Ledet, Glenn P Sanders, Darryl J DiRisio, Joseph C Glennon
BACKGROUND: Context: Achieving a successful spinal fusion requires the proper biologic and biomechanical environment. Optimizing load-sharing in the interbody space can enhance bone formation. For anterior cervical discectomy and fusion (ACDF), loading and motion are largely dictated by the stiffness of the plate which can facilitate a balance between stability and load-sharing. The advantages of load-sharing may be substantial for patients with comorbidities and in multi-level procedures where pseudarthrosis rates are significant...
February 13, 2018: Spine Journal: Official Journal of the North American Spine Society
https://www.readbyqxmd.com/read/29450207/fixation-of-traumatic-chondral-only-fragments-of-the-knee-in-pediatric-and-adolescent-athletes-a-retrospective-multicenter-report
#10
Peter D Fabricant, Yi-Meng Yen, Dennis E Kramer, Mininder S Kocher, Lyle J Micheli, J Todd R Lawrence, Theodore J Ganley, Benton E Heyworth
Background: While traditional biological principles have suggested that fragments consisting of cartilage alone cannot be reaffixed to bone with expectable long-term healing, case reports of successful healing after fixation in younger patients indicate that this concept remains incompletely explored. Purpose: To evaluate the presenting features, techniques, healing rates, and clinical and radiological results in a cohort of pediatric and adolescent athletes who underwent fixation of traumatic chondral-only fragments in the knee...
February 2018: Orthopaedic Journal of Sports Medicine
https://www.readbyqxmd.com/read/29448860/therapeutic-ionizing-radiation-induced-bone-loss-a-review-of-in-vivo-and-in-vitro-findings
#11
Jian Zhang, Xinyu Qiu, Kedi Xi, Wentao Hu, Hailong Pei, Jing Nie, Ziyang Wang, Jiahan Ding, Peng Shang, Bingyan Li, Guangming Zhou
Radiation therapy is one of the routine treatment modalities for cancer patients. Ionizing radiation (IR) can induce bone loss, and consequently increases the risk of fractures with delayed and nonunion of the bone in the cancer patients who receive radiotherapy. The orchestrated bone remodeling can be disrupted due to the affected behaviors of bone cells, including bone mesenchymal stem cells (BMSCs), osteoblasts and osteoclasts. BMSCs and osteoblasts are relatively radioresistant compared with osteoclasts and its progenitors...
February 15, 2018: Connective Tissue Research
https://www.readbyqxmd.com/read/29448712/a-simulated-body-fluid-evaluation-of-tio%C3%A2-barrier-oxide-layer-formed-by-electrochemical-reaction
#12
Jae-Myung Jang, Tae-Eon Park, Seung-Dai Kim, Han-Cheol Choe
The modified surface during implantation is considered to be an effective strategy to improve high adhesion of bone cell and osseointegration activity. In this paper, the TiO2 barrier oxide Layer has been fabricated by using the ion characteristic of an electrolytic solution, the surface characteristics have been investigated by EDS, XPS, and FE-SEM. From the analysis of the chemical states, phosphorus and calcium were observed in the TiO2 barrier layer, which were penetrated from the electrolyte into the oxide layer during deposit process...
March 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29448144/nanocements-produced-from-mesoporous-bioactive-glass-nanoparticles
#13
Min Sil Kang, Na-Hyun Lee, Rajendra K Singh, Nandin Mandakhbayar, Roman A Perez, Jung-Hwan Lee, Hae-Won Kim
Biomedical cements are considered promising injectable materials for bone repair and regeneration. Calcium phosphate composition sized with tens of micrometers is currently one of the major powder forms. Here we report a unique cement form made from mesoporous bioactive glass nanoparticles (BGn). The nanopowder could harden in reaction with aqueous solution at powder-to-liquid ratios as low as 0.4-0.5 (vs. 2.0-3.0 for conventional calcium phosphate cement CPC). The cementation mechanism investigated from TEM, XRD, FT-IR, XPS, and NMR analyses was demonstrated to be the ionic (Si and Ca) dissolution and then reprecipitation to form Si-Ca-(P) based amorphous nano-islands that could network the particles...
February 3, 2018: Biomaterials
https://www.readbyqxmd.com/read/29447960/mechanically-enhanced-nested-network-hydrogels-as-a-coating-material-for-biomedical-devices
#14
Zhengmu Wang, Hongbin Zhang, Axel J Chu, John Jackson, Karen Lin, Chinten James Lim, Dirk Lange, Mu Chiao
Well-organized composite formations such as hierarchical nested-network (NN) structure in bone tissue and reticular connective tissue present remarkable mechanical strength and play a crucial role in achieving physical and biological functions for living organisms. Inspired by these delicate microstructures in nature, an analogous scaffold of double network hydrogel was fabricated by creating a poly(2-hydroxyethyl methacrylate) (pHEMA) network in the porous structure of alginate hydrogels. The resulting hydrogel possessed hierarchical NN structure and showed significantly improved mechanical strength but still maintained high elasticity comparable to soft tissues due to a mutual strengthening effect between the two networks...
February 12, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29447959/effects-of-maturation-and-advanced-glycation-on-tensile-mechanics-of-collagen-fibrils-from-rat-tail-and-achilles-tendons
#15
Rene B Svensson, Stuart T Smith, Patrick J Moyer, S Peter Magnusson
Connective tissues are ubiquitous throughout the body and consequently affect the function of many organs. In load bearing connective tissues like tendon, the mechanical functionality is provided almost exclusively by collagen fibrils that in turn are stabilized by covalent cross-links. Functionally distinct tendons display different cross-link patterns, which also change with maturation, but these differences have not been studied in detail at the fibril level. In the present study, a custom built nanomechanical test platform was designed and fabricated to measure tensile mechanics of individual fibrils from rat tendons...
February 12, 2018: Acta Biomaterialia
https://www.readbyqxmd.com/read/29447756/the-biomechanical-significance-of-the-frontal-sinus-in-kabwe-1-homo-heidelbergensis
#16
Ricardo Miguel Godinho, Paul O'Higgins
Paranasal sinuses are highly variable among living and fossil hominins and their function(s) are poorly understood. It has been argued they serve no particular function and are biological 'spandrels' arising as a structural consequence of changes in associated bones and/or soft tissue structures. In contrast, others have suggested that sinuses have one or more functions, in olfaction, respiration, thermoregulation, nitric oxide production, voice resonance, reduction of skull weight, and craniofacial biomechanics...
January 2018: Journal of Human Evolution
https://www.readbyqxmd.com/read/29447753/kinematics-of-the-anthropoid-os-centrale-and-the-functional-consequences-of-scaphoid-centrale-fusion-in-african-apes-and-hominins
#17
Caley M Orr
In most primates, the os centrale is interposed between the scaphoid, trapezoid, trapezium, and head of the capitate, thus constituting a component of the wrist's midcarpal complex. Scaphoid-centrale fusion is among the clearest morphological synapomorphies of African apes and hominins. Although it might facilitate knuckle-walking by increasing the rigidity and stability of the radial side of the wrist, the exact functional significance of scaphoid-centrale fusion is unclear. If fusion acts to produce a more rigid radial wrist that stabilizes the hand and limits shearing stresses, then in taxa with a free centrale, it should anchor ligaments that check extension and radial deviation, but exhibit motion independent of the scaphoid...
January 2018: Journal of Human Evolution
https://www.readbyqxmd.com/read/29447314/restoration-of-periodontally-compromised-dentitions-using-telescopic-full-arch-retrievable-prosthesis-supported-by-tooth-implant-combination-a-long-term-retrospective-study
#18
Renzo Guarnieri, Stefano Ippoliti
Advanced periodontal disease is often associated with severe loss of tooth support, necessitating prosthetic rehabilitation to restore function and esthetics. For tooth-supported restorations, periodontally compromised teeth may need to be extracted due to early failure from functional overload. For tooth/implant-supported restorations, implants can be used to reduce the overload on teeth and to avoid tooth extraction, bone augmentation, or other risks associated with implant placement. The aim of this retrospective study was to evaluate the long-term outcomes of full-arch, retrievable, telescopic-retained prostheses (TRPs) on teeth and implants according to survival rate analyses and technical and biologic complications in full-mouth rehabilitation of periodontally compromised dentitions...
March 2018: International Journal of Periodontics & Restorative Dentistry
https://www.readbyqxmd.com/read/29447309/single-tooth-replacement-using-dental-implants-supporting-all-ceramic-and-metal-based-reconstructions-results-at-18-months-of-loading
#19
Adrian Bösch, Ronald Ernst Jung, Irena Sailer, Benic Goran, Christoph Hans Hämmerle, Daniel Stefan Thoma
The aim of this study was to compare customized zirconia and titanium abutments with respect to survival rates and technical, biologic, and esthetic outcomes. A total of 28 patients with single implants were randomly assigned to 12 customized zirconia (test, AC) and 16 customized titanium (control, MC) abutments. Technical, biologic, and esthetic outcomes were assessed after a mean follow-up time of 18 months. No biologic complications were observed, and no statistical difference for the bone-to-implant distance was found at 18 months (AC -0...
March 2018: International Journal of Periodontics & Restorative Dentistry
https://www.readbyqxmd.com/read/29447021/release-of-pro-inflammatory-cytokines-from-muscle-and-bone-causes-tenocyte-death-in-a-novel-rotator-cuff-in-vitro-explant-culture-model
#20
Brianne K Connizzo, Alan J Grodzinsky
Tendinopathy is a significant clinical problem thought to be associated with altered mechanical loading. Explant culture models allow researchers to alter mechanical loading in a controlled in vitro environment while maintaining tenocytes in their native matrix. However, current models do not accurately represent commonly injured tendons, ignoring contributions of associated musculature and bone, as well as regional collagen structure. This study details the characterization of a mouse rotator cuff explant culture model, including bone, tendon, and muscle (BTM)...
February 15, 2018: Connective Tissue Research
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