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Muscle regeneration

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https://www.readbyqxmd.com/read/28544348/galectin-1-promotes-an-m2-macrophage-response-to-polydioxanone-scaffolds
#1
Daniel Abebayehu, Andrew Spence, Barbara D Boyan, Zvi Schwartz, John J Ryan, Michael J McClure
Regulating soft tissue repair to prevent fibrosis and promote regeneration is central to creating a microenvironment conducive to soft tissue development. Macrophages play an important role in this process. Their response can be modulated using biomaterials, altering cytokine and growth factor secretion to promote regeneration. Electrospun polydioxanone (PDO) fiber scaffolds promoted an M2 phenotype when macrophages were cultured on large diameter, highly porous scaffolds, but an M1 phenotype on smaller diameter fibers...
May 22, 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/28543879/vglut1-synapses-and-p-boutons-on-regenerating-motoneurons-after-nerve-crush
#2
Adam J Schultz, Travis M Rotterman, Anirudh Dwarakanath, Francisco J Alvarez
Stretch-sensitive Ia afferent monosynaptic connections with motoneurons form the stretch reflex circuit. After nerve transection, Ia afferent synapses and stretch reflexes are permanently lost, even after regeneration and efficient re-innervation of muscle by motor and sensory afferents is completed in the periphery. This loss greatly affects full recovery of motor function. However, after nerve crush, reflex muscle forces during stretch do recover after muscle reinnervation and reportedly exceed 140% baseline values...
May 20, 2017: Journal of Comparative Neurology
https://www.readbyqxmd.com/read/28540725/a-bio-inspired-3d-multilayered-shape-memory-scaffold-with-a-hierarchically-changeable-micropatterned-surface-for-efficient-vascularization
#3
Dian Liu, Tao Xiang, Tao Gong, Tian Tian, Xian Liu, Shaobing Zhou
How to achieve three-dimensional (3D) cell alignment and subsequent prompt tissue regeneration remains a great challenge. Here, inspired by the interior 3D architecture of native arteries, we develop a new 3D multilayered shape memory vascular scaffold with a hierarchically changeable micropatterned surface for vascularization. The shape memory function renders the implantation of the scaffold safe and convenient via minimally invasive surgery. By co-culturing endothelial cells (ECs) and vascular smooth muscle cells (VSMCs) on the 3D multilayered structure, the inner monolayer, which has a square micropatterned surface, can promote EC adhesion and migration, resulting in rapid endothelialization; the outer multilayers, which have rectangular micropatterned surfaces, can induce a circumferential alignment of VSMCs...
May 25, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28540527/alignment-of-inducible-vascular-progenitor-cells-on-a-micro-bundle-scaffold-improves-cardiac-repair-following-myocardial-infarction
#4
Anurag Jamaiyar, Weiguo Wan, Vahagn Ohanyan, Molly Enrick, Danielle Janota, Devan Cumpston, Hokyung Song, Kelly Stevanov, Christopher L Kolz, Tatev Hakobyan, Feng Dong, Bi-Min Zhang Newby, William M Chilian, Liya Yin
Ischemic heart disease is still the leading cause of death even with the advancement of pharmaceutical therapies and surgical procedures. Early vascularization in the ischemic heart is critical for a better outcome. Although stem cell therapy has great potential for cardiovascular regeneration, the ideal cell type and delivery method of cells have not been resolved. We tested a new approach of stem cell therapy by delivery of induced vascular progenitor cells (iVPCs) grown on polymer micro-bundle scaffolds in a rat model of myocardial infarction...
July 2017: Basic Research in Cardiology
https://www.readbyqxmd.com/read/28537424/vascular-stem-progenitor-cell-migration-and-differentiation-in-atherosclerosis
#5
Baoqi Yu, Qishan Chen, Alexandra Le Bras, Li Zhang, Qingbo Xu
SIGNIFICANCE: Atherosclerosis is a major cause for the death of human beings, and takes place in large and middle-sized arteries. The pathogenesis of the disease has been widely investigated and new findings on vascular stem/progenitor cells could have impact on vascular regeneration. Recent Advances: Recent studies have shown that abundant stem/progenitor cells present in the vessel wall are mainly responsible for cell accumulation in the intima during vascular remodeling. It has been demonstrated that the mobilization and recruitment of tissue-resident stem/progenitor cells give rise to endothelial and smooth muscle cells, which participate in vascular repair and remodeling such as neointimal hyperplasia and arteriosclerosis...
May 24, 2017: Antioxidants & Redox Signaling
https://www.readbyqxmd.com/read/28536786/future-prospects-for-human-tissue-engineered-urethra-transplantation-decellularization-and-recellularization-based-urethra-regeneration
#6
Abdol-Mohammad Kajbafzadeh, Reza Abbasioun, Shabnam Sabetkish, Nastaran Sabetkish, Parvin Rahmani, Kamyar Tavakkolitabassi, Hamid Arshadi
To evaluate the histological characteristics of decellularized human urethra after transplantation into the rat omentum and compare in vivo cell seeding with perfusion-based and cell sheet urethral regeneration. Eight adult human male urethras accompanied with the surrounding corpus spongiosum were obtained. The tissues were decellularized with detergent-based method. The efficacy of decellularization and extracellular matrix preservation was evaluated by several techniques. Decellularized scaffolds were transplanted into the omentum of 12 male rats and located into the scrotum...
May 23, 2017: Annals of Biomedical Engineering
https://www.readbyqxmd.com/read/28536315/-skeletal-muscle-stem-cell
#7
Shinsuke Yuasa
Adult skeletal muscle has its own stem cell population known as satellite cells. After muscle injury, quiescent satellite cells are activated and then proliferate and differentiate into mature skeletal muscle to ensure that muscle function is recovered. In our screen for myocyte differentiation-promoting factors, we noted markedly elevated expression of granulocyte-colony stimulating factor receptor(G-CSFR, encoded by csf3r)in the skeletal muscle developing area. Furthermore, G-CSFR was transiently expressed in regenerating myocytes of adult injured skeletal muscle, and extrinsic G-CSF supported short-term and long-term muscle regeneration in mouse model of skeletal muscle injury...
2017: Clinical Calcium
https://www.readbyqxmd.com/read/28533931/altered-expression-of-c-kit-and-nanog-in-a-rat-model-of-adriamycin-induced-chronic-heart-failure
#8
Shuo Li, Kang Guo, Junfang Wu, Zhikun Guo, Airong Li
A small number of cardiac stem cells that express the c-Kit and Nanog biomarkers can be differentiated into myocardial cells, which suggests that these stem cells may be able to repair damage and provide an internal reserve for tissue regeneration. It is unknown, however, whether the levels of myocardial stem cells are altered after heart failure (HF), and whether HF affects the myocardial regenerative ability. In this study, to address this question, we developed a rat model of chronic HF induced by Adriamycin, and examined the morphological changes in c-Kit and Nanog-expressing stem cells in heart tissue of normal and HF rats...
2017: American Journal of Cardiovascular Disease
https://www.readbyqxmd.com/read/28532897/mast-cells-improve-functional-recovery-of-transected-peripheral-nerve-a-novel-preliminary-study
#9
Behrooz Ilkhanizadeh, Leila Zarei, Negin Farhad, Mehran Bahrami-Bukani, Rahim Mohammadi
BACKGROUND: Employment of regenerative properties of cells at the service of nerve repair has been initiated during recent decades. Effects of local transplantation of bone marrow-derived mast cells on peripheral nerve regeneration were studied using a rat sciatic nerve transection model. MATERIALS AND METHODS: A 10-mm sciatic nerve defect was bridged using a conduit chitosan-based hybrid conduit filled with BMMCs in BMMC group. In positive control group (Pos), the conduit was filled with phosphate-buffered saline alone...
May 11, 2017: Injury
https://www.readbyqxmd.com/read/28532087/the-repairing-of-full-thickness-skin-deficiency-and-its-biological-mechanism-using-decellularized-human-amniotic-membrane-as-the-wound-dressing
#10
Mengsheng Song, Weiqing Wang, Qihua Ye, Shizhong Bu, Zhisen Shen, Yabin Zhu
Human amniotic membrane (HAM) was a biocompatible scaffold with advantages of anti-inflammatory, low antigen, feasibility, tolerance and low cost. In our previous work, HAM was treated to be decellularized using surfactant, lipase and DNAase methods and the efficacy as an implantable biological mesh was verified after decellularization treatment. In this work, we used the previous protocol to decellularize the fresh HAM, and applied it to repair full-thickness skin defects with Sprague-Dawley rats as the test animals...
August 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
https://www.readbyqxmd.com/read/28530121/glucocorticoids-retain-bi-potent-fibroblast-progenitors-during-alveolar-septation-in-mice
#11
Stephen E McGowan, Diann M McCoy
Glucocorticoids have been widely used and exert pleiotropic effects on alveolar structure and function, but do not improve the long-term clinical outcomes for patients with bronchopulmonary dysplasia, emphysema, or interstitial lung diseases. Treatments which foster alveolar regeneration could substantially improve the long-term outcomes for such patients. One approach to alveolar regeneration is to stimulate and guide intrinsic alveolar progenitors along developmental pathways used during secondary septation...
May 21, 2017: American Journal of Respiratory Cell and Molecular Biology
https://www.readbyqxmd.com/read/28529498/eyelid-retraction-in-isolated-unilateral-congenital-blepharoptosis
#12
Michael S Salman, Ian H Clark
Isolated unilateral congenital ptosis is encountered relatively infrequently in clinical practice. It typically consists of a unilateral droopy eyelid, weak levator palpebrae superioris muscle function, lid lag, and an absent upper lid crease with no other abnormalities on examination. We present a four-and-a-half-year-old girl with isolated and mild unilateral congenital ptosis who unexpectedly demonstrated a static upper eyelid on downgaze in conjunction with a well-formed upper lid skin crease. We attribute this uncommon sign in congenital ptosis to stiffness and presumed fibrosis of the levator muscle...
2017: Frontiers in Neurology
https://www.readbyqxmd.com/read/28527715/influence-of-netrin-1-on-reinnervation-of-laryngeal-muscles-following-recurrent-laryngeal-nerve-injury
#13
Ignacio Hernandez-Morato, Shira Koss, Sansar Sharma, Michael J Pitman
Following recurrent laryngeal nerve (RLN) injury, recovery results in poor functional restitution of the paralyzed vocal fold. Netrin-1 has been found to be upregulated in the rat posterior cricoarytenoid muscle (PCA) during nerve regeneration, We evaluated the effect of ectopic Netrin-1 in the PCA during RLN reinnervation. The right RLN was transected and Netrin-1 was injected into the PCA (2.5, 5, 10, 15, 20μg/ml). At 7 days post injury fluorescent retrograde tracer was injected into PCA and Thyroarytenoid (TA) muscles...
May 17, 2017: Neuroscience Letters
https://www.readbyqxmd.com/read/28522730/11%C3%AE-hsd1-suppresses-cardiac-fibroblast-cxcl2-cxcl5-and-neutrophil-recruitment-to-the-heart-post-mi
#14
Katie J Mylonas, Neil A Turner, Sumia A Bageghni, Christopher J Kenyon, Christopher I White, Kieran McGregor, Robert A Kimmitt, Richard Sulston, Valerie Kelly, Brian R Walker, Karen E Porter, Karen E Chapman, Gillian A Gray
We have previously demonstrated that neutrophil recruitment to the heart following myocardial infarction (MI) is enhanced in mice lacking 11β-hydroxysteroid dehydrogenase type 1 (11β-HSD1) that regenerates active glucocorticoid within cells from intrinsically inert metabolites. The present study aimed to identify the mechanism of regulation. In a mouse model of MI, neutrophil mobilization to blood and recruitment to the heart were higher in 11β-HSD1-deficient (Hsd11b1(-)(/)(-) ) relative to wild-type (WT) mice, despite similar initial injury and circulating glucocorticoid...
June 2017: Journal of Endocrinology
https://www.readbyqxmd.com/read/28521693/from-tendon-injury-to-collagen-based-tendon-regeneration-overview-and-recent-advances
#15
Clément Rieu, Lise Picaut, Gervaise Mosser, Léa Trichet
Tendon injury is a clinical, societal and economical issue. Moreover, tendon repair represents an important clinical challenge, partly due to the mechanical constraints that occur at the junctions with muscle and bone. Several strategies have been developed for tendon repair. In this review, we first assess the importance of tendon injuries from different sites and their causes. After a short overview of tendon three-dimensional organization, the complexity of the perfect repair quest is presented ranging from current clinical procedures to new engineering scaffolds...
May 16, 2017: Current Pharmaceutical Design
https://www.readbyqxmd.com/read/28521021/satellite-cell-mediated-breast-muscle-regeneration-decreases-with-broiler-size
#16
M R Daughtry, E Berio, Z Shen, E J R Suess, N Shah, A E Geiger, E R Berguson, R A Dalloul, M E Persia, H Shi, D E Gerrard
Satellite cells (SCs) reside between the sarcolemma and basal lamina of muscle fibers and are the primary contributor of DNA for post-hatch muscle growth and repair. Alterations in SC content or properties by intrinsic and extrinsic factors can have detrimental effects on muscle health and function, and ultimately meat quality. We hypothesized that disrupted SC homeostasis may account in part for the increased breast myopathies observed in growing broilers. To test this hypothesis, we selected broilers with different body weights at comparable ages and studied SC characteristics in vitro and in vivo...
May 17, 2017: Poultry Science
https://www.readbyqxmd.com/read/28515121/ampk%C3%AE-1-ldh-pathway-regulates-muscle-stem-cell-self-renewal-by-controlling-metabolic-homeostasis
#17
Marine Theret, Linda Gsaier, Bethany Schaffer, Gaëtan Juban, Sabrina Ben Larbi, Michèle Weiss-Gayet, Laurent Bultot, Collodet Caterina, Marc Foretz, Dominique Desplanches, Pascual Sanz, Zizhao Zang, Lin Yang, Guillaume Vial, Benoit Viollet, Kei Sakamoto, Anne Brunet, Bénédicte Chazaud, Rémi Mounier
Control of stem cell fate to either enter terminal differentiation versus returning to quiescence (self-renewal) is crucial for tissue repair. Here, we showed that AMP-activated protein kinase (AMPK), the master metabolic regulator of the cell, controls muscle stem cell (MuSC) self-renewal. AMPKα1(-/-) MuSCs displayed a high self-renewal rate, which impairs muscle regeneration. AMPKα1(-/-) MuSCs showed a Warburg-like switch of their metabolism to higher glycolysis. We identified lactate dehydrogenase (LDH) as a new functional target of AMPKα1...
May 17, 2017: EMBO Journal
https://www.readbyqxmd.com/read/28513838/the-emerging-role-of-npnt-in-tissue-injury-repair-and-bone-homeostasis
#18
REVIEW
Youqiang Sun, Vincent Kuek, Heng Qiu, Jennifer Tickner, Leilei Chen, Haibin Wang, Wei He, Jiake Xu
Nephronectin (NPNT), a highly conserved extracellular matrix protein, plays an important role in regulating cell adhesion, differentiation, spreading and survival. NPNT protein belongs to epidermal growth factor (EGF)-like superfamily and exhibits several common structural determinants; including EGF-like repeat domains, MAM domain (Meprin, A5 Protein, and Receptor Protein-Tyrosine Phosphatase µ), RGD motif (Arg-Gly-Asp) and a coiled-coil domain. It regulates integrins-mediated signaling pathways via the interaction of its RGD motif with integrin α8β1...
May 17, 2017: Journal of Cellular Physiology
https://www.readbyqxmd.com/read/28512922/effect-of-chemical-immobilization-of-sdf-1%C3%AE-into-muscle-derived-scaffolds-on-angiogenesis-and-muscle-progenitor-recruitment
#19
Sareh Rajabi-Zeleti, Sasan Jalili-Firoozinezhad, Mohammad Kazemi Ashtiani, Gilles Le Carrou, Shahragim Tajbakhsh, Hossein Baharvand
The availability of three-dimensional bioactive scaffolds with enhanced angiogenic capacity that have the capability to recruit tissue specific resident progenitors is of great importance for the regeneration of impaired skeletal muscle. Here we have investigated whether introduction of chemoattractant factors to tissue specific extracellular matrix (ECM) promotes cellular behavior in vitro as well as muscle progenitor recruitment and vascularization in vivo. We developed an interconnective macroporous sponge from decellularized skeletal muscle with maintained biochemical traits of the intact muscle...
May 16, 2017: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/28512793/5-azacytidine-mediated-hmsc-behaviour-on-electrospun-scaffolds-for-skeletal-muscle-regeneration
#20
Ines Fasolino, Vincenzo Guarino, Valentina Cirillo, Luigi Ambrosio
Incomplete regeneration after trauma or muscular dysfunction is a common problem in muscle replacement therapies. Recent approaches in tissue engineering allow for the replication of skeletal muscle structure and function in vitro and in vivo by molecular therapies and implantable scaffolds which properly address muscle cells towards myotube differentiation and maturation. Here, we investigate the in vitro response of human Mesenchymal Stem Cells (hMSC) on electrospun fibres made of Polycaprolactone (PCL) in the presence of 5-azacytidine (5-AZA) to evaluate how fibrous network may influence the therapeutic effect of drug during in vitro myogenesis...
May 16, 2017: Journal of Biomedical Materials Research. Part A
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