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Mechanical wound closure

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https://www.readbyqxmd.com/read/28097936/experimental-study-on-tissue-phantoms-to-understand-the-effect-of-injury-and-suturing-on-human-skin-mechanical-properties
#1
Arnab Chanda, Vinu Unnikrishnan, Zachary Flynn, Kim Lackey
Skin injuries are the most common type of injuries occurring in day-to-day life. A skin injury usually manifests itself in the form of a wound or a cut. While a shallow wound may heal by itself within a short time, deep wounds require surgical interventions such as suturing for timely healing. To date, suturing practices are based on a surgeon's experience and may vary widely from one situation to another. Understanding the mechanics of wound closure and suturing of the skin is crucial to improve clinical suturing practices and also to plan automated robotic surgeries...
January 2017: Proceedings of the Institution of Mechanical Engineers. Part H, Journal of Engineering in Medicine
https://www.readbyqxmd.com/read/28077304/drosophila-dorsal-closure-an-orchestra-of-forces-to-zip-shut-the-embryo
#2
REVIEW
Peran Hayes, Jérôme Solon
Dorsal closure, a late-embryogenesis process, consists in the sealing of an epidermal gap on the dorsal side of the Drosophila embryo. Because of its similarities with wound healing and neural tube closure in humans, it has been extensively studied in the last twenty years. The process requires the coordination of several force generating mechanisms, that together will zip shut the epidermis. Recent works have provided a precise description of the cellular behavior at the origin of these forces and proposed quantitative models of the process...
January 7, 2017: Mechanisms of Development
https://www.readbyqxmd.com/read/28050314/biocompatibility-study-of-lithium-disilicate-and-zirconium-oxide-ceramics-for-esthetic-dental-abutments
#3
Céline Brunot-Gohin, Jean-Luc Duval, Sandra Verbeke, Kayla Belanger, Isabelle Pezron, Gérard Kugel, Dominique Laurent-Maquin, Sophie Gangloff, Christophe Egles
PURPOSE: The increasing demand for esthetically pleasing results has contributed to the use of ceramics for dental implant abutments. The aim of this study was to compare the biological response of epithelial tissue cultivated on lithium disilicate (LS2) and zirconium oxide (ZrO2) ceramics. Understanding the relevant physicochemical and mechanical properties of these ceramics will help identify the optimal material for facilitating gingival wound closure. METHODS: Both biomaterials were prepared with 2 different surface treatments: raw and polished...
December 2016: Journal of Periodontal & Implant Science
https://www.readbyqxmd.com/read/28017831/stress-signals-mediated-by-membranous-glucocorticoid-receptor-activate-plc-pkc-gsk-3%C3%AE-%C3%AE-catenin-pathway-to-inhibit-wound-closure
#4
Ivan Jozic, Sasa Vukelic, Olivera Stojadinovic, Liang Liang, Horacio A Ramirez, Irena Pastar, Marjana Tomic Canic
Glucocorticoids (GCs), key mediators of stress signals, are also potent wound healing inhibitors. To understand how stress signals inhibit wound healing, we investigated the role of membranous glucocorticoid receptor (mbGR) by using cell-impermeable BSA-conjugated Dexamethasone. We found that mbGR inhibits keratinocyte migration and wound closure by activating a Wnt-like PLC/PKC signaling cascade. Rapid activation of mbGR/PLC/PKC further leads to activation of known biomarkers of non-healing found in patients, β-catenin and c-myc...
December 22, 2016: Journal of Investigative Dermatology
https://www.readbyqxmd.com/read/27997709/the-role-of-allogenic-keratin-derived-dressing-in-wound-healing-in-a-mouse-model
#5
Marek Konop, Dorota Sulejczak, Joanna Czuwara, Piotr Kosson, Aleksandra Misicka, Aandrzej W Lipkowski, Lidia Rudnicka
: Keratin is an interesting protein needed for wound healing and tissue recovery. We have recently proposed a new, simple and inexpensive method to obtain fur and hair keratin-derived biomaterials suitable for medical application. The aim of the study was to evaluate the role of the fur keratin derived protein (FKDP) dressing in the allogenic full-thickness surgical skin wound model. RESULTS: The data obtained using scanning electron microscopy showed that employed processed biomaterial had higher surface porosity compared to control raw material...
December 20, 2016: Wound Repair and Regeneration
https://www.readbyqxmd.com/read/27989746/tension-re-builds-biophysical-mechanisms-of-embryonic-wound-repair
#6
REVIEW
Teresa Zulueta-Coarasa, Rodrigo Fernandez-Gonzalez
Embryonic tissues display an outstanding ability to rapidly repair wounds. Epithelia, in particular, serve as protective layers that line internal organs and form the skin. Thus, maintenance of epithelial integrity is of utmost importance for animal survival, particularly at embryonic stages, when an immune system has not yet fully developed. Rapid embryonic repair of epithelial tissues is conserved across species, and involves the collective migration of the cells around the wound. The migratory cell behaviours associated with wound repair require the generation and transmission of mechanical forces, not only for the cells to move, but also to coordinate their movements...
December 15, 2016: Mechanisms of Development
https://www.readbyqxmd.com/read/27917311/rock-inhibition-promotes-attachment-proliferation-and-wound-closure-in-human-embryonic-stem-cell-derived-retinal-pigmented-epithelium
#7
Roxanne H Croze, William J Thi, Dennis O Clegg
PURPOSE: Nonexudative (dry) age-related macular degeneration (AMD), a leading cause of blindness in the elderly, is associated with the loss of retinal pigmented epithelium (RPE) cells and the development of geographic atrophy, which are areas devoid of RPE cells and photoreceptors. One possible treatment option would be to stimulate RPE attachment and proliferation to replace dying/dysfunctional RPE and bring about wound repair. Clinical trials are underway testing injections of RPE cells derived from pluripotent stem cells to determine their safety and efficacy in treating AMD...
November 2016: Translational Vision Science & Technology
https://www.readbyqxmd.com/read/27916357/triclosan-sutures-for-surgical-site-infection-in-colorectal-cancer
#8
Kanefumi Yamashita, Shinsuke Takeno, Seiichiro Hoshino, Hironari Shiwaku, Naoya Aisu, Yoichiro Yoshida, Syu Tanimura, Yuichi Yamashita
BACKGROUND: Among all procedures, surgical site infections (SSIs) in colorectal surgery continue to have the highest rate, accounting for 5%-45%. To prevent the bacterial colonization of suture material, which disables local mechanisms of wound decontamination, triclosan-coated sutures were developed. We assessed the effectiveness of triclosan-coated sutures used for skin closure on the rate of SSIs in colorectal cancer surgery. METHODS: Until August 2012, we used conventional methods for skin closure in colorectal cancer surgery at the Department of Gastroenterological Surgery, Fukuoka University Faculty of Medicine...
November 2016: Journal of Surgical Research
https://www.readbyqxmd.com/read/27904691/implantation-of-placenta-derived-mesenchymal-stem-cells-accelerates-murine-dermal-wound-closure-through-immunomodulation
#9
Haifeng Wang, Lianyu Chen, Yang Liu, Bangzhen Luo, Nanzi Xie, Tao Tan, Lige Song, Pei Erli, Ming Luo
BACKGROUND: Diabetic foot ulcer (DFU) is a major complication of diabetes mellitus. Although previous studies have established that inflammation, ischemia and neuropathy contribute to the development of DFU, it is still an unmet medical need due to lack knowledge of cellular and molecular mechanisms associated with DFU. In the present study, we tested our hypothesis that subcutaneous application of human placental mesenchymal stem cells (PMSCs) can accelerate diabetic dermal wound healing by modulating immunoresponse...
2016: American Journal of Translational Research
https://www.readbyqxmd.com/read/27882274/mechanics-of-wound-closure-emerging-tape-based-wound-closure-technology-vs-traditional-methods
#10
Kemal Levi, Kei Ichiryu, Pelin Kefel, Juergen Keller, Jon Grice, Ori Belson, Eric Storne, Bauback Safa
To date, there is still a lack of understanding of how wound closure methods perform comparatively under daily bodily movement during the course of healing and how they affect the mechanics of healing. The present study is a first step in understanding and objectively quantifying the gap. The study provides both a new method of metrology for noninvasive evaluation of skin mechanics at the onset of wound healing and an emerging tape-based wound closure technology. The latter shows better performance with respect to commonly used staples and sutures, holding the wound intact and providing uniform mechanical support across the incision...
October 12, 2016: Curēus
https://www.readbyqxmd.com/read/27868279/involvement-of-dpp-iv-cd26-in-cutaneous-wound-healing-process-in-mice
#11
Lara Baticic Pucar, Ester Pernjak Pugel, Dijana Detel, Jadranka Varljen
Dipeptidyl peptidase IV (DPP IV/CD26) is a widely distributed multifunctional protein that plays a significant role in different physiological as well as pathological processes having a broad spectrum of bioactive substrates and immunomodulative properties. It has potential influence on different processes crucial for wound healing, including cell adhesion, migration, apoptosis and extracellular matrix degradation. However, despite its known enzymatic and immunomodulative functions, limited data characterize the role of DPP IV/CD26 in cutaneous wound healing mechanisms...
November 21, 2016: Wound Repair and Regeneration
https://www.readbyqxmd.com/read/27860426/human-corneal-fibroblast-migration-and-ecm-synthesis-during-stromal-repair-role-played-by-pdgf-bb-bfgf-and-tgf%C3%AE-1
#12
Patricia Gallego-Muñoz, Lucía Ibares-Frías, José A Garrote, María Cruz Valsero-Blanco, Roberto Cantalapiedra-Rodríguez, Jesús Merayo-Lloves, M Carmen Martínez-García
The development of treatments that modulate corneal wound healing to avoid fibrosis during tissue repair is important for the restoration of corneal transparency after an injury. To date, few studies have studied the influence of growth factors (GFs) on human corneal fibroblast (HCF) expression of extracellular matrix (ECM) proteins such as collagen types I and III, proteoglycans such as perlecan, or proteins implicated in cellular migration such as α5β1-integrin and syndecan-4. Using in vitro HCFs, we developed a mechanical wound model to study the influence of the GFs basic fibroblast growth factor (bFGF), platelet-derived growth factor (PDGF-BB), and transforming growth factor beta 1 (TGFβ1) on ECM protein production and cellular migration...
November 15, 2016: Journal of Tissue Engineering and Regenerative Medicine
https://www.readbyqxmd.com/read/27856288/a-multicenter-randomized-controlled-trial-evaluating-a-connexin43-mimetic-peptide-in-cutaneous-scarring
#13
Christina L Grek, Jade Montgomery, Meenakshi Sharma, A Ravi, J S Rajkumar, Kurtis E Moyer, Robert G Gourdie, Gautam S Ghatnekar
BACKGROUND: The transmembrane protein, connexin43 (Cx43) has key roles in fibrogenic processes including inflammatory signaling and extracellular matrix composition. aCT1 is a Cx43 mimetic peptide that in preclinical studies accelerated wound closure, decreased inflammation and granulation tissue area and normalized mechanical properties following cutaneous injury. PURPOSE: We evaluated the efficacy and safety of aCT1 in the reduction of scar formation in human incisional wounds...
November 14, 2016: Journal of Investigative Dermatology
https://www.readbyqxmd.com/read/27847641/poly-n-isopropylacrylamide-pnipam-a-reversible-bioadhesive-for-sclerotomy-closure
#14
Luiz H Lima, Yael Morales, Thiago Cabral
PURPOSE: To determine the safety and efficacy of poly-N-isopropylacrylamide, a thermoresponsive adhesive, for sutureless sclerotomy closure in rabbits. METHODS: Eight rabbits were randomized into three groups: short-term acute, mid-term chronic, and long-term chronic studies. A corresponding control group in which the scleral wounds were sutured by 6-0 vicryl sutures was assigned for each study group. A 20-gauge sclerotomy was performed following a core vitrectomy and 0...
2016: International Journal of Retina and Vitreous
https://www.readbyqxmd.com/read/27832158/arnica-montana-stimulates-extracellular-matrix-gene-expression-in-a-macrophage-cell-line-differentiated-to-wound-healing-phenotype
#15
Marta Marzotto, Clara Bonafini, Debora Olioso, Anna Baruzzi, Laura Bettinetti, Francesca Di Leva, Elisabetta Galbiati, Paolo Bellavite
Arnica montana (Arnica m.) is used for its purported anti-inflammatory and tissue healing actions after trauma, bruises, or tissue injuries, but its cellular and molecular mechanisms are largely unknown. This work tested Arnica m. effects on gene expression using an in vitro model of macrophages polarized towards a "wound-healing" phenotype. The monocyte-macrophage human THP-1 cell line was cultured and differentiated with phorbol-myristate acetate and Interleukin-4, then exposed for 24h to Arnica m. centesimal (c) dilutions 2c, 3c, 5c, 9c, 15c or Control...
2016: PloS One
https://www.readbyqxmd.com/read/27829065/cigarette-smoke-modulates-repair-and-innate-immunity-following-injury-to-airway-epithelial-cells
#16
Gimano D Amatngalim, Winifred Broekman, Nadia M Daniel, Luciën E P M van der Vlugt, Annemarie van Schadewijk, Christian Taube, Pieter S Hiemstra
Cigarette smoking is the main risk factor associated with chronic obstructive pulmonary disease (COPD), and contributes to COPD development and progression by causing epithelial injury and inflammation. Whereas it is known that cigarette smoke (CS) may affect the innate immune function of airway epithelial cells and epithelial repair, this has so far not been explored in an integrated design using mucociliary differentiated airway epithelial cells. In this study, we examined the effect of whole CS exposure on wound repair and the innate immune activity of mucociliary differentiated primary bronchial epithelial cells, upon injury induced by disruption of epithelial barrier integrity or by mechanical wounding...
2016: PloS One
https://www.readbyqxmd.com/read/27826116/safety-and-efficacy-of-advanced-bipolar-vessel-sealing-in-vaginal-hysterectomy-1000-cases
#17
Henri Clavé, Arnaud Clavé
STUDY OBJECTIVE: To determine the safety and efficacy of advanced electrothermal bipolar vessel sealing (EBVS) during vaginal hysterectomy by evaluating urinary complications, overall complications, and reoperation rate. DESIGN: A retrospective cohort (Canadian Task Force classification III) SETTING: High volume gynecologic surgeon practice, private hospital. PATIENTS: One thousand consecutive patients who have undergone vaginal hysterectomy for benign conditions carried out with EBVS between January 2002 and December 2012...
November 5, 2016: Journal of Minimally Invasive Gynecology
https://www.readbyqxmd.com/read/27810198/canine-mesenchymal-stem-cells-are-neurotrophic-and-angiogenic-an-in-vitro-assessment-of-their-paracrine-activity
#18
I R Al Delfi, J J Sheard, C R Wood, A Vernallis, J F Innes, P Myint, W E B Johnson
Mesenchymal stem cells (MSCs) have been used in cell replacement therapies for connective tissue damage, but also can stimulate wound healing through paracrine activity. In order to further understand the potential use of MSCs to treat dogs with neurological disorders, this study examined the paracrine action of adipose-derived canine MSCs on neuronal and endothelial cell models. The culture-expanded MSCs exhibited a MSC phenotype according to plastic adherence, cell morphology, CD profiling and differentiation potential along mesenchymal lineages...
November 2016: Veterinary Journal
https://www.readbyqxmd.com/read/27803921/use-of-adipose-derived-stem-cells-to-support-topical-skin-adhesive-for-wound-closure-a-preliminary-report-from-animal-in-vivo-study
#19
Maciej Nowacki, Katarzyna Pietkun, Arkadiusz Jundziłł, Tomasz Kloskowski, Dariusz Grzanka, Joanna Skopinska-Wisniewska, Kinga Scibior, Maciej Gagat, Marta Pokrywczyńska, Alina Grzanka, Wojciech Zegarski, Rafał Czajkowski, Tomasz Drewa, Barbara Zegarska
The aim of this study was to determine the local and systemic effects of adipose-derived stem cells (ADSCs) as a component of topical skin adhesive in an animal artificial wound closure model. In presented study the cosmetic effects, histological analysis, mechanical properties, and cell migration have been assessed to evaluate the usefulness of ADSCs as supporting factor for octyl blend cyanoacrylate adhesive. The total of 40 rats were used and divided into six groups. In the Study Group, ADSCs were administered by multipoint injection of the six surrounding intrawound areas with additional freely leaving procedure of the cells between the skin flaps just before applying adhesive to close the wound...
2016: BioMed Research International
https://www.readbyqxmd.com/read/27779171/knockdown-of-decoy-receptor-3-impairs-growth-and-invasiveness-of-hepatocellular-carcinoma-cell-line-of-hepg2
#20
Xiao-Na Zhou, Guang-Ming Li, Ying-Chen Xu, Tuan-Jie Zhao, Ji-Xiang Wu
BACKGROUND: Decoy receptor 3 (DcR3) binds to Fas ligand (FasL) and inhibits FasL-induced apoptosis. The receptor is overexpressed in hepatocellular carcinoma (HCC), and it is associated with the growth and metastatic spread of tumors. DcR3 holds promises as a new target for the treatment of HCC, but little is known regarding the molecular mechanisms underlying the oncogenic properties of DcR3. The present work, therefore, examined the role of DcR3 in regulating the growth and invasive property of liver cancer cell HepG2...
2016: Chinese Medical Journal
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