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Intervertebral Disc Mechanics

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https://www.readbyqxmd.com/read/28087442/hydrogen-sulfide-protects-against-endoplasmic-reticulum-stress-and-mitochondrial-injury-in-nucleus-pulposus-cells-and-ameliorates-intervertebral-disc-degeneration
#1
Daoliang Xu, Haiming Jin, Jianxia Wen, Jiaoxiang Chen, Deheng Chen, Ningyu Cai, Yongli Wang, Jianle Wang, Yu Chen, Xiaolei Zhang, Xiangyang Wang
It has been suggested that excessive apoptosis in intervertebral disc cells induced by inflammatory cytokines, such as interleukin (IL)-1β, is related to the process of intervertebral disc degeneration (IVDD). Hydrogen sulfide (H2S), a gaseous signaling molecule, has drawn attention for its anti-apoptosis role in various pathophysiological processes in degenerative diseases. To date, there has been no investigation of the correlation of H2S production and IVDD or of the effects of H2S on IL-1β-induced apoptosis in nucleus pulposus (NP) cells...
January 10, 2017: Pharmacological Research: the Official Journal of the Italian Pharmacological Society
https://www.readbyqxmd.com/read/28081267/single-nucleotide-variants-of-candidate-genes-in-aggrecan-metabolic-pathway-are-associated-with-lumbar-disc-degeneration-and-modic-changes
#2
Romain Shanil Perera, Poruwalage Harsha Dissanayake, Upul Senarath, Lalith Sirimevan Wijayaratne, Aranjan Lional Karunanayake, Vajira Harshadeva Weerabaddana Dissanayake
INTRODUCTION: Lumbar disc degeneration (LDD) is genetically determined and severity of LDD is associated with Modic changes. Aggrecan is a major proteoglycan in the intervertebral disc and end plate. Progressive reduction of aggrecan is a main feature of LDD and Modic changes. OBJECTIVES: The study investigated the associations of single nucleotide variants (SNVs) of candidate genes in the aggrecan metabolic pathway with the severity of LDD and Modic changes. In-silico functional analysis of significant SNVs was also assessed...
2017: PloS One
https://www.readbyqxmd.com/read/28019241/a-regenerative-approach-towards-recovering-the-mechanical-properties-of-degenerated-intervertebral-discs-genipin-and-platelet-rich-plasma-therapies
#3
Mohammad Nikkhoo, Jaw-Lin Wang, Masoud Abdollahi, Yu-Chun Hsu, Mohamad Parnianpour, Kinda Khalaf
Degenerative disc disease, associated with discrete structural changes in the peripheral annulus and vertebral endplate, is one of the most common pathological triggers of acute and chronic low back pain, significantly depreciating an individual's quality of life and instigating huge socioeconomic costs. Novel emerging therapeutic techniques are hence of great interest to both research and clinical communities alike. Exogenous crosslinking, such as Genipin, and platelet-rich plasma therapies have been recently demonstrated encouraging results for the repair and regeneration of degenerated discs, but there remains a knowledge gap regarding the quantitative degree of effectiveness and particular influence on the mechanical properties of the disc...
December 1, 2016: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/28012886/biomechanical-and-endplate-effects-on-nutrient-transport-in-the-intervertebral-disc
#4
Morgan B Giers, Bryce T Munter, Kyle J Eyster, George D Ide, Anna G U S Newcomb, Jennifer N Lehrman, Evgenii Belykh, Vadim A Byvaltsev, Brian P Kelly, Mark C Preul, Nicholas Theodore
BACKGROUND: Physical data are lacking on nutrient transport in human intervertebral discs (IVDs), which supports regeneration. Our objective was to study nutrient transport in porcine IVDs to determine the effects of biomechanical and physiological factors. METHODS: In vitro testing of whole porcine IVDs was performed under different loading conditions. Fifty cervical, thoracic, and lumbar discs with attached end plates were removed from 4 Yorkshire pigs (90-150 pounds)...
December 21, 2016: World Neurosurgery
https://www.readbyqxmd.com/read/28012080/three-dimensional-micro-computed-tomography-analysis-for-spinal-instability-after-lumbar-facetectomy-in-the-rat
#5
Daisuke Fukui, Mamoru Kawakami, Kevin Cheng, Koichiro Murata, Keianne Yamada, Rinoka Sato, Munehito Yoshida, Hiroshi Yamada, Nozomu Inoue, Koichi Masuda
PURPOSE: Intervertebral disc degeneration is thought to contribute to low back pain. However, the pathophysiological mechanisms remain controversial. In a previous study, we developed an animal model that showed delayed gait disturbance after lumbar facetectomy in the rat. We believe that this gait disturbance was caused by low back pain, although the mechanisms of this gait abnormality remain unknown. The purpose of this study was to evaluate structural changes of the lumbar spine after facetectomy in the rat utilizing three-dimensional micro-computed tomography (3DμCT) compared to histology...
December 23, 2016: European Spine Journal
https://www.readbyqxmd.com/read/28011632/a-developmental-transcriptomic-analysis-of-pax1-and-pax9-in-embryonic-intervertebral-disc-development
#6
V Sivakamasundari, Petra Kraus, Wenjie Sun, Xiaoming Hu, Siew Lan Lim, Shyam Prabhakar, Thomas Lufkin
Pax1 and Pax9 play redundant, synergistic functions in the patterning and differentiation of the sclerotomal cells that give rise to the vertebral bodies and intervertebral discs (IVD) of the axial skeleton. They are conserved in mice and humans, whereby mutations/deficiency of human PAX1/PAX9 have been associated with kyphoscoliosis. By combining cell-type specific transcriptome and ChIP-sequencing data, we identified the roles of Pax1/Pax9 in cell proliferation, cartilage development and collagen fibrillogenesis, which are vital in early IVD morphogenesis...
December 23, 2016: Biology Open
https://www.readbyqxmd.com/read/28010945/impact-of-material-and-morphological-parameters-on-the-mechanical-response-of-the-lumbar-spine-a-finite-element-sensitivity-study
#7
Thomas Zander, Marcel Dreischarf, Anne-Katrin Timm, Wolfgang W Baumann, Hendrik Schmidt
Finite element models are frequently used to study lumbar spinal biomechanics. Deterministic models are used to reflect a certain configuration, including the means of geometrical and material properties, while probabilistic models account for the inherent variability in the population. Because model parameters are generally uncertain, their predictive power is frequently questioned. In the present study, we determined the sensitivities of spinal forces and motions to material parameters of intervertebral discs, vertebrae, and ligaments and to lumbar morphology...
December 16, 2016: Journal of Biomechanics
https://www.readbyqxmd.com/read/27996077/hybrid-rigid-deformable-model-for-prediction-of-neighboring-intervertebral-disc-loads-during-flexion-movement-after-lumbar-interbody-fusion-at-l3-4-level
#8
Tien Tuan Dao
Knowledge of spinal loads in neighboring discs after interbody fusion plays an important role in the clinical decision of this treatment as well as in the elucidation of its effect. However, controversial findings are still noted in the literature. Moreover, there are no existing models for efficient prediction of intervertebral disc stresses within annulus fibrosus (AF) and nucleus pulposus (NP) regions. In this present study, a new hybrid rigid-deformable modeling workflow was established to quantify the mechanical stress behavior within AF and NP regions of the L4-5, L2-3, and L1-2 discs after interbody fusion at L3-4 level...
December 20, 2016: Journal of Biomechanical Engineering
https://www.readbyqxmd.com/read/27994557/intervertebral-disc-swelling-demonstrated-by-3d-and-water-content-magnetic-resonance-analyses-after-a-3-day-dry-immersion-simulating-microgravity
#9
Loïc Treffel, Karen Mkhitaryan, Stéphane Gellee, Guillemette Gauquelin-Koch, Claude Gharib, Stéphane Blanc, Catherine Millet
Background: Vertebral deconditioning is commonly experienced after space flight and simulation studies. Disc herniation is quadrupled after space flight. Purpose: The main hypothesis formulated by the authors is that microgravity results in intervertebral disc (IVD) swelling. Study Design: The aim of the study was to identify the morphological changes of the spine and their clinical consequences after simulated microgravity by 3-day dry immersion (DI). The experimental protocol was performed on 12 male volunteers using magnetic resonance imaging and spectroscopy before and after DI...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27943659/the-fabrication-and-characterization-of-a-multi-laminate-angle-ply-collagen-patch-for-annulus-fibrosus-repair
#10
Rachel McGuire, Ryan Borem, Jeremy Mercuri
One major limitation of intervertebral disc (IVD) repair is that no ideal biomaterial has been developed that effectively mimics the angle-ply collagen architecture and mechanical properties of the native annulus fibrosus (AF). Furthermore, it would be beneficial to devise a simple, scalable process by which to manufacture a biomimetic biomaterial that could function as a mechanical repair patch to be secured over a large defect in the outer AF that will support AF tissue regeneration. Such a biomaterial would: (1) enable the employment of early-stage interventional strategies to treat IVD degeneration (i...
December 12, 2016: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/27903131/hypoxic-expansion-of-human-mesenchymal-stem-cells-enhances-3d-maturation-of-tissue-engineered-intervertebral-discs
#11
Katherine Deline Hudson, Lawrence J Bonassar
Culture of three dimensional (3D) constructs in hypoxic conditions (1-5% O2) has been shown to increase production of extracellular matrix (ECM) components in primary intervertebral disc (IVD) cells, and drive chondrogenesis of human mesenchymal stem cells (MSCs). Growing evidence that suggests that two dimensional (2D) expansion under hypoxic conditions may have an even greater influence on chondrogenesis in MSCs. This study aims to determine the effects of hypoxia during 2D expansion and subsequent 3D culture on the in vitro maturation of tissue engineering IVDs (TE-IVDs) made with human MSCs, using a previously developed TE-IVD system...
November 30, 2016: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/27872846/effect-of-static-load-on-the-nucleus-pulposus-of-rabbit-intervertebral-disc-motion-segment-in-an-organ-culture
#12
Jia-Wen Zhan, Min-Shan Feng, Li-Guo Zhu, Ping Zhang, Jie Yu
The development of mechanically active culture systems helps in understanding of the role of mechanical stress in intervertebral disc (IVD) degeneration. Motion segment cultures facilitate the application and control of mechanical loads. The purpose of this study was to establish a culturing method for rabbit IVD motion segments to observe the effect of static load on the whole disc organ. Segments were cultured in custom-made apparatuses under a constant, compressive load (3 kg) for 2 weeks. Tissue integrity, matrix synthesis, and matrix gene expression profile were assessed and compared with fresh one...
2016: BioMed Research International
https://www.readbyqxmd.com/read/27859817/lncrnas-novel-players-in-intervertebral-disc-degeneration-and-osteoarthritis
#13
REVIEW
Wen-Kang Chen, Xiao-Hua Yu, Wei Yang, Cheng Wang, Wen-Si He, Yi-Guo Yan, Jian Zhang, Wen-Jun Wang
The term long non-coding RNA (lncRNA) refers to a group of RNAs with length more than 200 nucleotides, limited protein-coding potential, and having widespread biological functions, including regulation of transcriptional patterns and protein activity, formation of endogenous small interfering RNAs (siRNAs) and natural microRNA (miRNA) sponges. Intervertebral disc degeneration (IDD) and osteoarthritis (OA) are the most common chronic, prevalent and age-related degenerative musculoskeletal disorders. Numbers of lncRNAs are differentially expressed in human degenerative nucleus pulposus tissue and OA cartilage...
November 9, 2016: Cell Proliferation
https://www.readbyqxmd.com/read/27854109/effect-of-mono-or-bisegmental-lordosizing-fusion-on-short-term-global-and-index-sagittal-balance-a-radiographic-study
#14
Enrico Tessitore, Ilaria Melloni, Oliver P Gautschi, Gianluigi Zona, Karl Schaller, Pedro Berjano
BACKGROUND: Sagittal balance is widely recognized as an important outcome factor in reconstructive spinal surgery for lumbar degenerative conditions. However, its role in short segmental fixation is unknown. The aim of this study is to evaluate the preoperative and short-term postoperative spino-pelvic balance after short (1 or 2 levels) lordosizing lumbar fusion for degenerative disc disease (DDD). MATERIALS AND METHODS: Twenty-six consecutive patients (13 males and 13 females) undergoing mono- or bisegmental lordosizing lumbar fusion (XLIF/TLIF) for lumbar DDD were included in the study...
November 17, 2016: Journal of Neurosurgical Sciences
https://www.readbyqxmd.com/read/27836574/towards-bioreactor-development-with-physiological-motion-control-and-its-applications
#15
Marcus Stoffel, Wolfgang Willenberg, Marzieh Azarnoosh, Nadine Fuhrmann-Nelles, Bei Zhou, Bernd Markert
In biomedical applications bioreactors are used, which are able to apply mechanical loadings under cultivation conditions on biological tissues. However, complex mechanobiological evolutions, such as the dependency between mechanical properties and cell activity, depend strongly on the applied loading conditions. This requires correct physiological movements and loadings in bioreactors. The aim of the present study is to develop bioreactors, in which native and artificial biological tissues can be cultivated under physiological conditions in knee joints and spinal motion segments...
January 2017: Medical Engineering & Physics
https://www.readbyqxmd.com/read/27830029/cellular-mechanical-properties-reflect-the-differentiation-potential-of-nucleus-pulposus-derived-progenitor-cells
#16
Ming-Han Liu, You-Hong Cui, Yue Zhou
Mechanical properties of cells reflect differences in cellular subpopulations, differentiation potency, and cell behaviors. Previous study has revealed that intervertebral disc (IVD) degeneration leads to alterations in cell behavior and differentiation potency. Human nucleus pulposus-derived progenitor cells (NPPCs) are an attractive cell sources for IVD regeneration. However, the relationship between mechanical properties and differentiation potential in different NPPC subpopulations is few known. In this study, mechanical properties of different NPPC subpopulations were measured via atomic force microscopy (AFM) and correlated with differentiation potential of NPPCs...
2016: American Journal of Translational Research
https://www.readbyqxmd.com/read/27810730/an-interpenetrating-network-composite-for-a-regenerative-spinal-disc-application
#17
A H Chan, P C Boughton, A J Ruys, M L Oyen
Severe degeneration of the intervertebral disc has an immensely debilitating effect on quality of life that has become a serious health and economic burden throughout the world. The disc plays an integral role in biomechanical movement and support within the spine. The emergence of tissue engineering endeavours to restore the structural characteristics and functionality of the native tissue. Hydrogels have been widely investigated as a candidate for regeneration of the gelatinous nucleus pulposus due to its architectural resemblance and fluid retention characteristics...
January 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/27810728/material-properties-of-bovine-intervertebral-discs-across-strain-rates
#18
Nicolas Newell, Grigorios Grigoriadis, Alexandros Christou, Diagarajen Carpanen, Spyros D Masouros
The intervertebral disc (IVD) is a complex structure responsible for distributing compressive loading to adjacent vertebrae and allowing the vertebral column to bend and twist. To study the mechanical behaviour of individual components of the IVD, it is common for specimens to be dissected away from their surrounding tissues for mechanical testing. However, disrupting the continuity of the IVD to obtain material properties of each component separately may result in erroneous values. In this study, an inverse finite element (FE) modelling optimisation algorithm has been used to obtain material properties of the IVD across strain rates, therefore bypassing the need to harvest individual samples of each component...
January 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/27792110/role-of-sirt1-plays-in-nucleus-pulposus-cells-and-intervertebral-disc-degeneration
#19
Ji Guo, Minghao Shao, Feizhou Lu, Jianyuan Jiang, Xinlei Xia
STUDY DESIGN: Experimental in vivo and in vitro study of intervertebral disc (IVD) degeneration and the mechanism exploration. OBJECTIVE: This report aims to verify the expression of Sirt1 in IVD degeneration of different grades and explore its potential mechanism in human nucleus pulposus cells. SUMMARY OF BACKGROUND DATA: Silent mating type information regulator 2 homolog 1 (Sirt1) has draw immense attention because of its influence on a variety of aging-related diseases...
October 25, 2016: Spine
https://www.readbyqxmd.com/read/27769935/the-matrikine-n-acetylated-proline-glycine-proline-induces-premature-senescence-of-nucleus-pulposus-cells-via-cxcr1-dependent-ros-accumulation-and-dna-damage-and-reinforces-the-destructive-effect-of-these-cells-on-homeostasis-of-intervertebral-discs
#20
Chencheng Feng, Yang Zhang, Minghui Yang, Minghong Lan, Huan Liu, Jian Wang, Yue Zhou, Bo Huang
Intervertebral disc (IVD) cell senescence is a recognized mechanism of intervertebral disc degeneration (IDD). Elucidating the molecular mechanisms underlying disc cell senescence will contribute to understanding the pathogenesis of IDD. We previously reported that N-acetylated proline-glycine-proline (N-Ac-PGP), a matrikine, is involved in the process of IDD. However, its roles in IDD are not well understood. Here, using rat nucleus pulposus (NP) cells, we found that N-Ac-PGP induced premature senescence of NP cells by binding to CXCR1...
January 2017: Biochimica et Biophysica Acta
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