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https://www.readbyqxmd.com/read/28437887/influence-of-sinomenine-upon-mesenchymal-stem-cells-in-osteoclastogenesis
#1
Biao Zhou, Xiaolong Lu, Zhi Tang, Dan Liu, Youliang Zhou, Peng Zeng, Hui Xiong
With the advent of aging, the morbidity rates of such diseases as osteoarthritis, rheumatoid arthritis, and osteoporosis has witnessed a significant increase. As a common rattan drug, sinomenine (SIN) has been widely applied for the treatment of various arthritic diseases in traditional Chinese medicine (TCM) clinics. Given that SIN has been reported to inhibit the expression of Prostaglandin E2 (PGE2) in several types of cells, in this study, the influence of SIN treatment on PGE2 expression in mesenchymal stem cells (MSCs), thereby changing the osteoprotegerin (OPG) receptor/activator for the nuclear factor-κ B ligand (RANKL) ratio, was investigated...
April 19, 2017: Biomedicine & Pharmacotherapy, Biomédecine & Pharmacothérapie
https://www.readbyqxmd.com/read/28437792/phase-plate-cryo-em-structure-of-a-class-b-gpcr-g-protein-complex
#2
Yi-Lynn Liang, Maryam Khoshouei, Mazdak Radjainia, Yan Zhang, Alisa Glukhova, Jeffrey Tarrasch, David M Thal, Sebastian G B Furness, George Christopoulos, Thomas Coudrat, Radostin Danev, Wolfgang Baumeister, Laurence J Miller, Arthur Christopoulos, Brian K Kobilka, Denise Wootten, Georgios Skiniotis, Patrick M Sexton
Class B G-protein-coupled receptors are major targets for the treatment of chronic diseases, such as osteoporosis, diabetes and obesity. Here we report the structure of a full-length class B receptor, the calcitonin receptor, in complex with peptide ligand and heterotrimeric Gαsβγ protein determined by Volta phase-plate single-particle cryo-electron microscopy. The peptide agonist engages the receptor by binding to an extended hydrophobic pocket facilitated by the large outward movement of the extracellular ends of transmembrane helices 6 and 7...
April 24, 2017: Nature
https://www.readbyqxmd.com/read/28437576/irisin-and-musculoskeletal-health
#3
Graziana Colaianni, Saverio Cinti, Silvia Colucci, Maria Grano
Irisin is a hormone-like myokine produced in abundance by skeletal muscle in response to exercise, both in mice and humans. Once released into the circulation, irisin acts on white adipocytes to induce the browning response and subsequently activates nonshivering thermogenesis. We have examined the premise that irisin produced during exercise may subserve further functions in the musculoskeletal system. We review evidence for its possible skeletal effects, including the central role that irisin plays in the control of bone mass, with positive effects on cortical mineral density and geometry in mice...
April 24, 2017: Annals of the New York Academy of Sciences
https://www.readbyqxmd.com/read/28437193/evaluation-of-the-effects-of-photobiomodulation-on-biomechanical-properties-and-hounsfield-unit-of-partial-osteotomy-healing-in-an-experimental-rat-model-of-type-i-diabetes-and-osteoporosis
#4
Ataroalsadat Mostafavinia, Reza Ahadi, Mohammadamin Abdollahifar, Seyed Kamran Ghorishi, Ali Jalalifirouzkouhi, Mohammad Bayat
BACKGROUND: Pulsed wave (PW) lasers exhibit biostimulatory effects on fractures in healthy and diabetic animals. OBJECTIVE: This study aims to assess the effects of photobiomodulation on bone strength and Hounsfield unit (HU) for repair of a bone defect in an experimental rat model of type I diabetes mellitus (TIDM) and osteoporosis (OP). METHODS: We divided 30 female rats into six groups of n = 5 per group: (1) ovariectomy (OVX) control, (2) OVX + PW laser and no TIDM, (3) OVX control + TIDM, (4) OVX + TIDM + PW laser, (5) OVX + TIDM + alendronate, and (6) OVX + TIDM + PW laser + alendronate...
February 22, 2017: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/28436570/bre-enhances-osteoblastic-differentiation-by-promoting-the-mdm2-mediated-degradation-of-p53
#5
Fujun Jin, Yiliang Wang, Xiaojing Wang, Yanting Wu, Xiaoyan Wang, Qiuying Liu, Yexuan Zhu, Enqi Liu, Jianglin Fan, Yifei Wang
Bre is a conserved cellular protein expressed in various tissues. Its major function includes DNA damage repair and anti-apoptosis. Recent studies indicate that Bre is potentially involved in stem cell differentiation although pathophysiological significance along with the molecular mechanisms is still unclear. Here, we report that Bre protein was substantially expressed in the bone tissue and its expression was highly upregulated during the osteogenic differentiation. To test a hypothesis that Bre plays functional roles in the process of osteogenic differentiation, we examined the expression of Bre in an osteoporosis mouse model...
April 24, 2017: Stem Cells
https://www.readbyqxmd.com/read/28435922/spontaneous-corpectomy-and-anterior-arthrodesis-in-lumbar-spine-how-ankylosing-spondylitis-can-resolve-a-vertebral-fracture
#6
Daniele Vanni, Andrea Pantalone, Stefano Di Carlo, Vincenzo Magliani, Pedro Berjano, Vincenzo Salini
Between the 80% and 90% of vertebral fractures in over 65 years people are due to osteoporosis. Over the 30% of patients affected by vertebral osteoporosis fractures needs of surgical treatment and the 12% presents complications requiring an invasive surgical approach. We report an unusual case of spontaneous corpectomy and anterior arthrodesis occurred in a patient suffering from Ankylosing Spondylitis. This event invites us to reflect about the magnitude of the biological power of the bone healing, even in adverse conditions...
March 2017: Journal of Spine Surgery (Hong Kong)
https://www.readbyqxmd.com/read/28435582/transient-osteoporosis-of-the-hip-a-case-report
#7
K Pande, T T Aung, J F Leong, I Bickle
Transient osteoporosis of the hip (TOH) is a benign, selflimiting condition characterised by acute onset groin pain in adults. Early diagnosis is important to differentiate it from progressive conditions such as osteonecrosis. We report on a middle-aged male who presented with right groin pain without any prior trauma. The diagnosis of transient osteoporosis of hip was confirmed by Magnetic Resonance Imaging (MRI) and he was successfully treated with a course of Alendronate sodium, anti-inflammatory analgesics and a period of non-weight bearing ambulation...
March 2017: Malaysian Orthopaedic Journal
https://www.readbyqxmd.com/read/28435337/treatment-strategies-for-the-female-athlete-triad-in-the-adolescent-athlete-current-perspectives
#8
REVIEW
Jill Thein-Nissenbaum, Erin Hammer
Since the passage of Title IX in 1972, female sports participation has dramatically increased. The benefits of physical activity, including decreased risk for heart disease and diabetes as well as improved body image and self-esteem, far outweigh the risks. However, a select population of adolescent and young adult females may experience symptoms related to the female athlete triad (Triad), which refers to the interrelatedness of energy availability, menstrual function, and bone mineral density (BMD). These conditions often manifest clinically as disordered eating behaviors, menstrual irregularity, and stress fractures; an individual may suffer from 1 or all of the Triad components simultaneously...
2017: Open Access Journal of Sports Medicine
https://www.readbyqxmd.com/read/28434258/protective-effects-of-casein-derived-peptide-vlpvpqk-against-hydrogen-peroxide-induced-dysfunction-and-cellular-oxidative-damage-in-rat-osteoblastic-cells
#9
S B Mada, S Reddi, N Kumar, S Kapila, R Kapila
Oxidative stress inhibits osteoblast differentiation and function that lead to the development of osteoporosis. Casein-derived peptide VLPVPQK (PEP), a potent antioxidant, was isolated from β-casein of buffalo milk. We used an in vitro oxidative stress model induced by hydrogen peroxide (H2O2) in rat osteoblastic cells to investigate the protective effects of PEP against H2O2-induced dysfunction and oxidative damage. Cells were pretreated with PEP (50-200 ng/mL) for 2, 7 or 21 days followed by 0.3 mM H2O2 treatment for 24 h and then markers of osteogenic development, oxidative damage and apoptosis were examined...
January 1, 2017: Human & Experimental Toxicology
https://www.readbyqxmd.com/read/28433451/prospective-randomized-study-comparing-two-cephalomedullary-nails-for-elderly-intertrochanteric-fractures-zimmer-natural-nail-versus-proximal-femoral-nail-antirotation-ii
#10
Young-Soo Shin, Jin-Eon Chae, Tae-Wook Kang, Seung-Beom Han
OBJECTIVES: Although both clinical and biomechanical studies suggest that cephalomedullary implants have a mechanical advantage over extramedullary implants, a high rate of complications or implant failure remains in elderly patients with osteoporosis. In an attempt to address some of these challenges, new implants with improved designs named proximal femoral nail antirotation II (PFNA II) and Zimmer natural nail (ZNN) were developed for elderly patients. Although the PFNA II reportedly has good clinical outcomes, it is unclear which implant achieves better safety and efficacy for treating intertrochanteric hip fractures...
April 13, 2017: Injury
https://www.readbyqxmd.com/read/28433450/a-retrospective-cohort-study-of-concomitant-ipsilateral-extra-capsular-and-intra-capsular-fractures-of-the-proximal-femur-are-they-casual-findings-or-an-undervalued-reality
#11
Miquel Videla-Cés, José-Miguel Sales-Pérez, Joan Girós-Torres, Rubén Sánchez-Navés, Sebastián Videla
BACKGROUND: Fractures of the proximal femur constitute a major public health problem, with an annual incidence in Spain of 7.6 cases per 1000 inhabitants over 65 years of age. Hip fractures are frequent in elderly patients, related to osteoporosis and with low energy trauma, which means that they can be considered a geriatric syndrome. Simultaneous ipsilateral extra- and intra-articular hip fractures are considered as very rare are, and generally speaking, classified as extra- or intra-capsular fractures...
April 13, 2017: Injury
https://www.readbyqxmd.com/read/28432640/osteoporosis-bone-mineral-density-and-ckd-mbd-treatment-considerations
#12
REVIEW
Jordi Bover, Lucía Bailone, Víctor López-Báez, Silvia Benito, Paola Ciceri, Andrea Galassi, Mario Cozzolino
Osteoporosis and chronic kidney disease (CKD) have both independently important potential impact on bone health. A significant number of patients with CKD stages 3a-5D have been shown to have low bone mineral density (BMD), leading to a strikingly elevated risk of fractures (mainly hip fractures) and higher associated morbidity and mortality. Mechanical properties of bone beyond age and menopausal status are additionally affected by intrinsic uremic factors. Therefore, we review in this article not only general concepts of osteoporosis and related consequences, but also the diagnostic and therapeutic implications of low BMD and bone fractures in CKD, beyond increased vascular calcification...
April 21, 2017: Journal of Nephrology
https://www.readbyqxmd.com/read/28432597/t-regulatory-cells-in-bone-remodelling
#13
REVIEW
Aline Bozec, Mario M Zaiss
PURPOSE OF THE REVIEW: In this review, we present the role of regulatory T (Treg) cells in bone remodelling and bone-related disease such as osteoporosis or inflammatory bone loss. We also discuss the cellular and molecular mechanism how Treg cells regulate osteoclastogenesis. RECENT FINDINGS: Treg cells could regulate osteoclastogenesis by secreting TGF-β and IL-10 as well as IL-4 cytokines. Moreover, Treg cells can additionally regulate osteoclast differentiation, in a cell-to-cell contact via the cytotoxic T lymphocyte antigen (CTLA-4)...
April 21, 2017: Current Osteoporosis Reports
https://www.readbyqxmd.com/read/28432596/exploiting-the-wnt-signaling-pathway-for-clinical-purposes
#14
REVIEW
Mark L Johnson, Robert R Recker
PURPOSE OF REVIEW: The goal of this paper is to evaluate critically the literature published over the past 3 years regarding the Wnt signaling pathway. The Wnt pathway was found to be involved in bone biology in 2001-2002 with the discovery of a (G171V) mutation in the lipoprotein receptor-related protein 5 (LRP5) that resulted in high bone mass and another mutation that completely inactivated Lrp5 function and resulted in osteoporosis pseudoglioma syndrome (OPPG). The molecular biology has been complex, and very interesting...
April 21, 2017: Current Osteoporosis Reports
https://www.readbyqxmd.com/read/28432574/a-critical-appraisal-of-the-quality-of-adult-dual-energy-x-ray-absorptiometry-guidelines-in-osteoporosis-using-the-agree-ii-tool-an-euroaim-initiative
#15
Carmelo Messina, Bianca Bignotti, Alberto Bazzocchi, Catherine M Phan, Alberto Tagliafico, Giuseppe Guglielmi, Francesco Sardanelli, Luca Maria Sconfienza
OBJECTIVES: Dual energy X-ray absorptiometry (DXA) is the most widely used technique to measure bone mineral density (BMD). Appropriate and accurate use of DXA is of great importance, and several guidelines have been developed in the last years. Our aim was to evaluate the quality of published guidelines on DXA for adults. METHODS: Between June and July 2016 we conducted an online search for DXA guidelines, which were evaluated by four independent readers blinded to each other using the AGREE II instrument...
April 21, 2017: Insights Into Imaging
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
#16
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
https://www.readbyqxmd.com/read/28431912/osteosarcopenic-obesity-prevalence-and-relation-with-frailty-and-physical-performance-in-middle-aged-and-older-women
#17
Claudia Szlejf, Lorena Parra-Rodríguez, Oscar Rosas-Carrasco
OBJECTIVES: The aims of this study were to determine the prevalence of osteosarcopenic obesity (OSO) and to investigate its association with frailty and physical performance in Mexican community-dwelling middle-aged and older women. DESIGN: Cross-sectional analysis of a prospective cohort. SETTING: The FraDySMex study, a 2-round evaluation of community-dwelling adults from 2 municipalities in Mexico City. PARTICIPANTS: Participants were 434 women aged 50 years or older, living in the designated area in Mexico City...
April 18, 2017: Journal of the American Medical Directors Association
https://www.readbyqxmd.com/read/28431765/immune-modulation-by-vitamin-d-special-emphasis-on-its-role-in-prevention-and-treatment-of-cancer
#18
REVIEW
Franco Pandolfi, Laura Franza, Claudia Mandolini, Pio Conti
PURPOSE: Vitamin D has been known to be involved in mineral and bone homeostasis for many years. In the past its main use was in treating osteoporosis and rickets. In recent years it was found that vitamin D is an immune-modulating agent and may also have a role in several diseases, including autoimmune diseases. The immune-modulating effects appear to be mediated by vitamin D interaction with the vitamin D receptor (VDR) that has transcriptional effects and is expressed on various cell types, especially those of the immune system...
April 18, 2017: Clinical Therapeutics
https://www.readbyqxmd.com/read/28431174/opportunities-for-exercise-during-pullet-rearing-part-ii-long-term-effects-on-bone-characteristics-of-adult-laying-hens-at-the-end-of-lay
#19
T M Casey-Trott, D R Korver, M T Guerin, V Sandilands, S Torrey, T M Widowski
Osteoporosis in laying hens has been a production and welfare concern for several decades. The objective of this study was to determine whether differing opportunities for exercise during pullet rearing influences long-term bone quality characteristics in end-of-lay hens. A secondary objective was to assess whether differing opportunities for exercise in adult housing systems alters bone quality characteristics in end-of-lay hens. Four flock replicates of 588 Lohmann Selected Leghorn-Lite pullets were reared in either conventional cages (Conv) or an aviary rearing system (Avi) and placed into conventional cages (CC), 30-bird furnished cages (FC-S), or 60-bird furnished cages (FC-L) for adult housing...
April 18, 2017: Poultry Science
https://www.readbyqxmd.com/read/28429905/maintenance-vitamin-d3-dosage-requirements-in-chinese-women-with-post-menopausal-osteoporosis-living-in-the-tropics
#20
Yogeswari Venugopal, Sharifah F Wan Muhamad Hatta, Nurbazlin Musa, Siti Abdul Rahman, Jeyakantha Ratnasingam, Sharmila Sunita Paramasivam, Lee Ling Lim, Luqman Ibrahim, Karen Choong, Alexander Tb Tan, Karuthan Chinna, Siew Pheng Chan, Shireene R Vethakkan
BACKGROUND AND OBJECTIVES: Vitamin D3 (cholecalciferol) dose required to maintain sufficiency in non- Caucasian women with postmenopausal osteoporosis (PMO) inthe tropics has not been well studied. Some guidelines mandate 800-1000 IU vitamin D/day but the Endocrine Society (US) advocates 1500-2000 IU/day to maintain 25-hydroxyvitamin-D (25(OH)D) concentration at >75 nmol/L. We aimed to establish oral cholecalciferol dose required to maintain 25(OH)D concentration at >75 nmol/L in PMO Chinese Malaysian women, postulating lower dose requirements amongst light-skinned subjects in the tropics...
May 2017: Asia Pacific Journal of Clinical Nutrition
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