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Extracellular matrix chronic wounds

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https://www.readbyqxmd.com/read/29750813/autophagy-mediates-tumor-necrosis-factor-%C3%AE-induced-phenotype-switching-in-vascular-smooth-muscle-a7r5-cell-line
#1
Marina García-Miguel, Jaime A Riquelme, Ignacio Norambuena-Soto, Pablo E Morales, Fernanda Sanhueza-Olivares, Constanza Nuñez-Soto, David Mondaca-Ruff, Nicole Cancino-Arenas, Alejandra San Martín, Mario Chiong
Vascular smooth muscle cells (VSMC) dedifferentiation from a contractile to a synthetic phenotype contributes to atherosclerosis. Atherosclerotic tissue has a chronic inflammatory component with high levels of tumor necrosis factor-α (TNF-α). VSMC of atheromatous plaques have increased autophagy, a mechanism responsible for protein and intracellular organelle degradation. The aim of this study was to evaluate whether TNF-α induces phenotype switching of VSMCs and whether this effect depends on autophagy...
2018: PloS One
https://www.readbyqxmd.com/read/29672785/-tissue-engineering-of-adipose-tissue-with-biodegradable-biomaterials-for-soft-tissue-reconstruction
#2
Silvan Klein, Thiha Aung, Robert Michael Haas, Fabian Medved, Stefan M Schiller, Oliver Felthaus, Jürgen H Dolderer
Soft tissue defects resulting from injuries, tumor resection, congenital anomalies or chronic wounds pose a great challenge to reconstructive surgery. The current gold standard in therapy of such defects is the tissue transplantation in terms of free or local flaps. Unfortunately, donor site morbidity remains a considerable risk of flap surgery. Therefore, tissue engineering of autologous vascularized long term stable adipose tissue constructs could enrich the therapeutic possibilities of soft tissue defects...
April 2018: Handchirurgie, Mikrochirurgie, Plastische Chirurgie
https://www.readbyqxmd.com/read/29601617/collagen-powder-in-wound-healing
#3
Penelope J Kallis, Adam J Friedman
Chronic wounds, such as pressure ulcers, diabetic foot ulcers, and venous leg ulcers, are associated with high costs, poor quality of life, and significant morbidity and mortality. A chronic wound develops when progression through the normal phases of wound healing goes awry, creating a hostile environment with elevated levels of pro-inflammatory cytokines, increased matrix metalloproteinases (MMPs), destruction of extracellular matrix (ECM) components, and diminished activity of growth factors and other soluble mediators...
April 1, 2018: Journal of Drugs in Dermatology: JDD
https://www.readbyqxmd.com/read/29584602/effect-of-a-new-purified-collagen-matrix-with-polyhexamethylene-biguanide-on-recalcitrant-wounds-of-various-etiologies-a-case-series
#4
Dimitrios Lintzeris, Karen Vernon, Heather Percise, Andy Strickland, Kari Yarrow, Amber White, Mary Gurganus, Susan Sherrod, Kathleen Vergin, Laura Johnson
INTRODUCTION: The management of chronic, nonhealing wounds in patients with multiple comorbidities continues to be a challenge for health care practitioners. Chronic wounds typically do not progress through the normal phases of wound healing and generally remain stagnant during the inflammatory phase, resulting in an increase in proteolytic enzymes with degradation of the extracellular matrix. Bacterial biofilm has been documented to be one of the main factors delaying wound healing, resulting in the prolongation of the inflammatory phase...
March 2018: Wounds: a Compendium of Clinical Research and Practice
https://www.readbyqxmd.com/read/29567398/delivery-systems-of-current-biologicals-for-the-treatment-of-chronic-cutaneous-wounds-and-severe-burns
#5
Meilang Xue, Ruilong Zhao, Haiyan Lin, Christopher Jackson
While wound therapy remains a clinical challenge in current medical practice, much effort has focused on developing biological therapeutic approaches. This paper presents a comprehensive review of delivery systems for current biologicals for the treatment of chronic wounds and severe burns. The biologicals discussed here include proteins such as growth factors and gene modifying molecules, which may be delivered to wounds free, encapsulated, or released from living systems (cells, skin grafts or skin equivalents) or biomaterials...
March 19, 2018: Advanced Drug Delivery Reviews
https://www.readbyqxmd.com/read/29493309/the-influence-of-matrix-metalloproteases-and-biofilm-on-chronic-wound-healing-a-discussion
#6
Alison Parnham, Chrissie Bousfield
Chronicity in wound healing is a challenge for health services financially and scientifically, with negative consequences on patients' lives. This paper seeks to explore why chronic wounds fail to heal in relation to the inflammatory cellular dysfunction associated with biofilm development. Findings demonstrate an association between chronic wounds failing to heal, the presence of devitalised tissue and abnormal immune cell activity with a consequential excessive release of harmful matrix metalloproteases (MMPs)...
March 2, 2018: British Journal of Community Nursing
https://www.readbyqxmd.com/read/29451178/involvement-of-epithelial-mesenchymal-transition-in-liver-fibrosis
#7
REVIEW
Kangkang Yu, Qian Li, Guangfeng Shi, Ning Li
Fibrosis of the liver is an inherent wound healing response to chronic liver injury. Regeneration of liver epithelium and restoration of normal liver structure were generally involved in this process. Although the liver has a striking capacity to adapt to damage through tissue repair, excessive accumulation of extracellular matrix during this process often leads to scar tissue formation and subsequent fibrosis. Epithelial to mesenchymal transition (EMT) enables a polarized epithelial cell to undergo multiple changes biochemically and to bear a mesenchymal cell phenotype...
January 2018: Saudi Journal of Gastroenterology: Official Journal of the Saudi Gastroenterology Association
https://www.readbyqxmd.com/read/29434006/msc-exosome-a-novel-cell-free-therapy-for-cutaneous-regeneration
#8
REVIEW
Peipei Wu, Bin Zhang, Hui Shi, Hui Qian, Wenrong Xu
Cutaneous regeneration is a dynamic and complex process that requires a series of coordinated interactions involving epidermal cells, dermal cells, growth factors, the extracellular matrix (ECM), nerves and blood vessels at a damaged site. Mesenchymal stromal cells (MSCs) have been reported to participate in all afore-mentioned stages. Exosomes are one of the key secretory products of MSCs, resembling the effect of parental MSCs. They can shuttle various proteins, messenger RNA (mRNA) and microRNAs (miRNAs) to modulate the activity of recipient cells, and play important roles in cutaneous wound healing...
March 2018: Cytotherapy
https://www.readbyqxmd.com/read/29416088/ephb2-receptor-tyrosine-kinase-promotes-hepatic-fibrogenesis-in-mice-via-activation-of-hepatic-stellate-cells
#9
Patrice N Mimche, Choon M Lee, Sylvie M Mimche, Manoj Thapa, Arash Grakoui, Mark Henkemeyer, Tracey J Lamb
Hepatic fibrosis is the result of an excessive wound-healing response subsequent to chronic liver injury. A feature of liver fibrogenesis is the secretion and deposition of extracellular matrix proteins by activated hepatic stellate cells (HSCs). Here we report that upregulation of EphB2 is a prominent feature of two mouse models of hepatic fibrosis and also observed in humans with liver cirrhosis. EphB2 is upregulated and activated in mouse HSCs following chronic carbon tetrachloride (CCl4 ) exposure. Moreover, we show that EphB2 deficiency attenuates liver fibrosis and inflammation and this is correlated with an overall reduction in pro-fibrotic markers, inflammatory chemokines and cytokines...
February 7, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29406300/a-retrospective-cost-minimization-analysis-of-disposable-and-traditional-negative-pressure-wound-therapy-medicare-paid-claims
#10
Gary Delhougne, Christopher Hogan, Kim Tarka, Sunitha Nair
Traditional negative pressure wound therapy (NPWT) systems are considered durable. The pump is designed for use by numerous patients over a period of several years. Recently developed smaller, disposable devices are designed for single-patient use. A retrospective analysis of 2012-2014 national Medicare claims data was used to examine payments associated with the use of traditional and disposable NPWT systems. Data extracted included NPWT episodes from the Limited Data Set Standard Analytic Files including the 5% sample for traditional NPWT and 100% sample for disposable NPWT...
January 2018: Ostomy/wound Management
https://www.readbyqxmd.com/read/29405092/a-porcine-model-of-skin-wound-infected-with-a-polybacterial-biofilm
#11
Pavel Klein, Martin Sojka, Jan Kucera, Jana Matonohova, Vojtech Pavlik, Jan Nemec, Gabriela Kubickova, Rastislav Slavkovsky, Katarzyna Szuszkiewicz, Petr Danek, Miroslav Rozkot, Vladimir Velebny
A clinically relevant porcine model of a biofilm-infected wound was established in 10 minipigs. The wounds of six experimental animals were infected with a modified polymicrobial Lubbock chronic wound biofilm consisting of Staphylococcus aureus, Enterococcus faecalis, Pseudomonas aeruginosa and Bacillus subtilis. Four animals served as uninfected controls. The wounds were monitored until they had healed for 24 days. The biofilm persisted in the wounds up to day 14 and significantly affected healing. The control to infected healed wound area ratios were: 45%/21%, 66%/37%, and 90%/57% on days 7, 10 and 14, respectively...
February 2018: Biofouling
https://www.readbyqxmd.com/read/29377539/therapeutic-effects-of-a-recombinant-human-collagen-peptide-bioscaffold-with-human-adipose-derived-stem-cells-on-impaired-wound-healing-after-radiotherapy
#12
Takanobu Mashiko, Hitomi Takada, Szu-Hsien Wu, Koji Kanayama, Jingwei Feng, Kensuke Tashiro, Rintaro Asahi, Ataru Sunaga, Kazuto Hoshi, Akira Kurisaki, Tsuyoshi Takato, Kotaro Yoshimura
Chronic changes following radiotherapy include alterations in tissue-resident stem cells and vasculatures, which can lead to impaired wound healing. In this study, novel recombinant human collagen peptide (rhCP) scaffolds were evaluated as a biomaterial carrier for cellular regenerative therapy. Human adipose-derived stem cells (hASCs) were successfully cultured on rhCP scaffolds. By hASC culture on rhCP, microarray assay indicated that expression of genes related to cell proliferation and extracellular matrix production was upregulated...
January 26, 2018: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/29366789/acidification-induces-ogr1-ca-2-calpain-signaling-in-gingival-fibroblasts
#13
Mi Seong Kim, Dong Min Shin, Min Seuk Kim
Gingivitis, the mildest form of periodontitis, is generally considered a consequence of prolonged exposure of the gingiva to periodontal pathogens. On the other hand, several epidemiologic reports have suggested that other etiologic factors such as oral acidification may also increase the susceptibility of the periodontium to destruction. However, the pathologic mechanism underlying the effects of oral acidification on the gingiva is still largely unknown. In this study, we analyzed molecular pathways mediating the influence of the acidic environment on human gingival fibroblasts (HGFs)...
February 5, 2018: Biochemical and Biophysical Research Communications
https://www.readbyqxmd.com/read/29361086/inhibition-of-fibroblast-activation-protein-restores-a-balanced-extracellular-matrix-and-reduces-fibrosis-in-crohn-s-disease-strictures-ex-vivo
#14
Marta Truffi, Luca Sorrentino, Matteo Monieri, Paolo Fociani, Serena Mazzucchelli, Matteo Bonzini, Pietro Zerbi, Gianluca M Sampietro, Antonio Di Sabatino, Fabio Corsi
Background: Crohn's disease (CD) is a chronic bowel inflammation that ultimately leads to fibrosis, for which medical therapy is currently unavailable. Fibrotic strictures in CD are characterized by excessive extracellular matrix (ECM) deposition, altered balance between matrix metalloproteinases (MMPs) and their tissue inhibitors (TIMPs), and overexpression of fibroblast activation protein (FAP), a marker of active fibroblasts. Here we investigated the role of FAP-targeted therapy in ECM remodeling in CD strictures ex vivo...
January 18, 2018: Inflammatory Bowel Diseases
https://www.readbyqxmd.com/read/29324432/an-overview-of-clinical-and-health-economic-evidence-regarding-porcine-small-intestine-submucosa-extracellular-matrix-in-the-management-of-chronic-wounds-and-burns
#15
Leo M Nherera, Marco Romanelli, Paul Trueman, Valentina Dini
Small intestine submucosa (SIS) has been extensively evaluated in preclinical models and developed into commercially produced medical technologies intended for use in several different indications. The SIS extracellular matrix cellular and/or tissue-based product is a commercially available, porcine-derived SIS dressing. The purpose of this review was to consider the role of the SIS dressing in the management of chronic wounds and burns. Using a variety of search terms from the literature to describe the SIS dressing, the following databases were searched: PubMed, York Centre for Reviews and Dissemination database, National Health Service Economic Evaluation database, Health Technology Assessment database, and the Cochrane Library...
December 2017: Ostomy/wound Management
https://www.readbyqxmd.com/read/29324425/comparison-of-a-saline-coupled-bipolar-sealer-versus-traditional-electrosurgery-in-a-porcine-model-of-chronic-wound-healing
#16
Darvin J Griffin, Palaniswamy Vijay, Molly Speltz, Nicole Kirchhof, Joshua G Vose
OBJECTIVE: This study examines the healing dynamics of in vivo porcine muscle tissue wounds hemostatically treated with a saline-coupled bipolar tissue sealer (SCBS) compared with traditional electrosurgical (ES) coagulation. MATERIALS AND METHODS: Six cutaneous incisions were created on the dorsum of 28 adult male Yorkshire swine. The underlying muscle tissue was incised with a cold scalpel then treated with either SCBS (at 170 W) or traditional ES (at Coag 45 W)...
December 2017: Wounds: a Compendium of Clinical Research and Practice
https://www.readbyqxmd.com/read/29320588/a-guide-to-tissue-engineered-skin-substitutes
#17
Penelope J Kallis, Adam J Friedman, Hadar Lev-Tov
<p>Wounds that exhibit delayed healing have a tremendous impact on health care expenditures and place patients at serious risk for severe complications including death. The healing of a chronic wound requires the restoration of multiple factors that normally work in concert to repair the damaged skin barrier. Skin substitutes have shown great promise for use as adjunctive therapies for refractory wounds by providing cells, soluble mediators, and extracellular matrix materials needed to stimulate healing...
January 1, 2018: Journal of Drugs in Dermatology: JDD
https://www.readbyqxmd.com/read/29303417/evaluation-of-detergent-free-and-detergent-based-methods-for-decellularization-of-murine-skin
#18
Ali Farrokhi, Mohammadreza Pakyari, Layla Nabai, Amir Pourghadiri, Ryan Hartwell, Reza B Jalili, Aziz Ghahary
Acute and chronic wounds contribute to increased morbidity and mortality in affected people and impose significant financial burdens on healthcare systems. For these challenging wounds, Acellular Dermal Matrices (ADMs) have been used as a biological wound coverage. Unlike engineered dermal matrices, ADMs are prepared through the removal of cells from skin, while preserving the extracellular matrix structure and function. In this study, our primary objective was to develop a detergent-free method of decellularization of the skin to mitigate chemical stress on matrix molecules...
January 5, 2018: Tissue Engineering. Part A
https://www.readbyqxmd.com/read/29233714/bi-layered-nanocomposite-bandages-for-controlling-microbial-infections-and-overproduction-of-matrix-metalloproteinase-activity
#19
J Anjana, Annapoorna Mohandas, S Seethalakshmy, Maneesha K Suresh, Riju Menon, Raja Biswas, R Jayakumar
Chronic diabetic wounds is characterised by increased microbial contamination and overproduction of matrix metalloproteases that would degrade the extracellular matrix. A bi-layer bandage was developed, that promotes the inhibition of microbial infections and matrix metalloprotease (MMPs) activity. Bi-layer bandage containing benzalkonium chloride loaded gelatin nanoparticles (BZK GNPs) in chitosan-Hyaluronic acid (HA) as a bottom layer and sodium alendronate containing chitosan as top layer was developed. We hypothesized that the chitosan-gelatin top layer with sodium alendronate could inhibit the MMPs activity, whereas the chitosan-HA bottom layer with BZK GNPs (240±66nm) would enable the elimination of microbes...
April 15, 2018: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/29225709/immunomodulatory-effects-of-human-cryopreserved-viable-amniotic-membrane-in-a-pro-inflammatory-environment-in-vitro
#20
Claire E Witherel, Tony Yu, Mark Concannon, Will Dampier, Kara L Spiller
Introduction: Chronic wounds remain a major clinical challenge. Human cryopreserved viable amniotic membrane (hCVAM) is among the most successful therapies, but the mechanisms of action remain loosely defined. Because proper regulation of macrophage behavior is critical for wound healing with biomaterial therapies, we hypothesized that hCVAM would positively regulate macrophage behavior in vitro , and that soluble factors released from the hCVAM would be important for this effect. Materials and Methods: Primary human pro-inflammatory (M1) macrophages were seeded directly onto intact hCVAM or cultured in separation via transwell inserts (Soluble Factors) in the presence of pro-inflammatory stimuli (interferon- γ and lipopolysaccharide) to simulate the chronic wound environment...
October 2017: Cellular and Molecular Bioengineering
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