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Mechanical wound closure

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https://www.readbyqxmd.com/read/29343818/a-surfactant-polymer-dressing-potentiates-antimicrobial-efficacy-in-biofilm-disruption
#1
Piya Das Ghatak, Shomita S Mathew-Steiner, Priyanka Pandey, Sashwati Roy, Chandan K Sen
A 100% water-soluble surfactant polymer dressing (SPD) that is bio-compatible and non-ionic has been reported to improve wound closure in preliminary clinical studies. The mechanism of action of SPD in wound healing remains unclear. Biofilm infection is a significant problem that hinders proper wound closure. The objective of this study was to characterize the mechanism of action of SPD inhibition of bacterial biofilm development. Static biofilms (48 h) of the primary wound pathogens Pseudomonas aeruginosa (PA01), Staphylococcus aureus (USA300) were grown on polycarbonate membranes and treated with SPD with and without antibiotics for an additional 24 h...
January 17, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29336522/continued-root-maturation-despite-persistent-apical-periodontitis-of-immature-permanent-teeth-after-failed-regenerative-endodontic-therapy
#2
Louis M Lin, Sahng G Kim, Gabriela Martin, Bill Kahler
Three immature permanent teeth with pulp necrosis and apical periodontitis were treated with regenerative endodontic therapy (RET), which included root canal disinfection with sodium hypochlorite irrigation, intra-canal medication with calcium hydroxide paste, 17% EDTA rinse, induction of periapical bleeding into the canal, collagen matrix and MTA coronal seal, and composite resin restoration of access cavities. After different periods of follow-up, it was observed that continued root maturation, especially apical closure occurred despite persistent apical periodontitis of immature permanent teeth after failed RET...
January 16, 2018: Australian Endodontic Journal: the Journal of the Australian Society of Endodontology Inc
https://www.readbyqxmd.com/read/29334185/physical-properties-of-implanted-porous-bioscaffolds-regulate-skin-repair-focusing-on-mechanical-and-structural-features
#3
REVIEW
Shumeng Jiang, Sabrina Cloud Li, Chenyu Huang, Barbara Pui Chan, Yanan Du
Porous bioscaffolds are applied to facilitate skin repair since the early 1990s, but a perfect regeneration outcome has yet to be achieved. Until now, most efforts have focused on modulating the chemical properties of bioscaffolds, while physical properties are traditionally overlooked. Recent advances in mechanobiology and mechanotherapy have highlighted the importance of biomaterials' physical properties in the regulation of cellular behaviors and regenerative processes. In skin repair, the mechanical and structural features of porous bioscaffolds are two major physical properties that determine therapeutic efficacy...
January 15, 2018: Advanced Healthcare Materials
https://www.readbyqxmd.com/read/29330408/collagen-type-1-accelerates-healing-of-ruptured-fetal-membranes
#4
Haruta Mogami, Annavarapu Hari Kishore, R Ann Word
Preterm premature rupture of membranes (pPROM) is a major cause of preterm birth. Recently, extracellular matrix-directed treatment is applied for wound healing. Here, we used a pregnant mouse model to test the efficacy of collagen type 1 gel for healing of the prematurely ruptured fetal membranes. Although injection of PBS into the ruptured fetal membranes resulted in 40% closure, injection of collagen type 1 improved closure rates to 90% within 72 h. Macrophages of the M2 wound healing phenotype were entrapped in the collagen layer...
January 12, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29330021/ccn4-wisp1-controls-cutaneous-wound-healing-by-modulating-proliferation-migration-and-ecm-expression-in-dermal-fibroblasts-via-%C3%AE-5%C3%AE-1-and-tnf%C3%AE
#5
Mitsuaki Ono, Asuka Masaki, Azusa Maeda, Tina M Kilts, Emilio S Hara, Taishi Komori, Hai Pham, Takuo Kuboki, Marian F Young
Understanding the mechanisms that control cutaneous wound healing is crucial to successfully manage repair of damaged skin. The goal of the current study was to uncover novel extracellular matrix (ECM) components that control the wound healing process. Full thickness skin defects were created in mice and used to show CCN4 up-regulation during wound-healing as early as 1 day after surgery, suggesting a role in inflammation and subsequent dermal migration and proliferation. To determine how CCN4 could regulate wound healing we used Ccn4-KO mice and showed they had delayed wound closure accompanied by reduced expression of Col1a1 and Fn mRNA...
January 9, 2018: Matrix Biology: Journal of the International Society for Matrix Biology
https://www.readbyqxmd.com/read/29328541/gm-csf-ameliorates-micro-vascular-barrier-integrity-via-pericytes-derived-ang-1-in-wound-healing
#6
Min Yan, Yange Hu, Min Yao, Shisan Bao, Yong Fang
BACKGROUND: Skin wound healing involves complex coordinated interactions of cells, tissues and mediators. Maintaining microvascular barrier integrity is one of the key events for endothelial homeostasis during wound healing. Vasodilation is observed after vasoconstriction, which causes blood vessels to become porous, facilitates leukocyte infiltration and aids angiogenesis at the wound-area, post-injury. Eventually, vessel integrity has to be re-established for vascular maturation. Numerous studies have found that granulocyte macrophage colony-stimulating factor (GM-CSF) accelerates wound healing by inducing recruitment of repair cells into the injury area and releases of cytokines...
January 12, 2018: Wound Repair and Regeneration
https://www.readbyqxmd.com/read/29324653/surgical-dynamometer-to-simultaneously-measure-the-tension-forces-and-the-distance-between-wound-edges-during-the-closure-of-a-laparotomy
#7
Joan Roca, Miquel Nogués, Rafael Villalobos, María Carmen Mías, Martí Comellas, Cristina Gas, Jorge Juan Olsina
The closure of the abdominal wall after making a laparotomy is a major challenge for surgeons, since a significant percentage of closures fail and incisional hernias rise. The suture has to withstand the forces required to close the incision, while not hindering the adequate wound healing progression. Currently, there is no surgical measuring device that could be used to determine the required closing forces, which can be very different depending on the patient. This paper presents a dynamometer to measure the tension forces to be applied while closing a surgical incision, and it simultaneously measures the distance between wound edges...
January 11, 2018: Sensors
https://www.readbyqxmd.com/read/29290800/exosomes-from-human-umbilical-cord-blood-accelerate-cutaneous-wound-healing-through-mir-21-3p-mediated-promotion-of-angiogenesis-and-fibroblast-function
#8
Yin Hu, Shan-Shan Rao, Zhen-Xing Wang, Jia Cao, Yi-Juan Tan, Juan Luo, Hong-Ming Li, Wei-She Zhang, Chun-Yuan Chen, Hui Xie
The application of blood plasma for soft tissue wound healing is receiving much more attention recently. Exosomes are critical paracrine mediators that can be obtained from biological fluids including plasma and be able to induce regenerative effects by transferring bioactive molecules such as microRNAs (miRNAs). This study aimed to investigate the effects of exosomes from human umbilical cord blood plasma (UCB-Exos) on wound healing and to elucidate the underlying mechanism. Methods: UCB-Exos were isolated by ultracentrifugation and subcutaneously injected into full-thickness skin wounds in mice...
2018: Theranostics
https://www.readbyqxmd.com/read/29288081/effect-of-poly-ethylene-glycol-on-insulin-stability-and-cutaneous-cell-proliferation-in-vitro-following-cytoplasmic-delivery-of-insulin-loaded-nanoparticulate-carriers-a-potential-topical-wound-management-approach
#9
Dalia H Abdelkader, Mohamed A Osman, Sanaa A El-Gizawy, Suzan J Hawthorne, Ahmed M Faheem, Paul A McCarron
We describe the development of a nanoparticulate system, with variation of poly(ethylene glycol) (PEG) content, capable of releasing therapeutic levels of bioactive insulin for extended periods of time. Recombinant human insulin was encapsulated in poly(d,l-lactide-co-glycolide) nanoparticles, manufactured with variation in poly(ethylene glycol) content, and shown to be stable for 6days using SDS-PAGE, western blot and MALDI MS. To determine if insulin released from this sustained release matrix could stimulate migration of cell types normally active in dermal repair, a model wound was simulated by scratching confluent cultures of human keratinocytes (HaCaT) and fibroblasts (Hs27)...
December 26, 2017: European Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/29285837/the-new-metformin-derivative-hl156a-prevents-oral-cancer-progression-by-inhibiting-the-igf-akt-mtor-pathways
#10
Thuy Giang Lam, Yun Soo Jeong, Soo-A Kim, Sang-Gun Ahn
Metformin is a biguanide widely prescribed as an antidiabetic drug for type 2 diabetes mellitus patients. The purpose of this study was to observe the effects of the new metformin derivative, HL156A, on human oral cancer cell and to investigate its possible mechanisms. It was observed that HL156A significantly decreased FaDu and YD-10B cell viability and colony formation in a dose dependent manner. HL156A also markedly reduced wound closure and migration of FaDu and YD-10B cells. We observed that HL156A decreased mitochondrial membrane potential and induced ROS levels and apoptotic cells with caspase-3 and -9 activation...
December 29, 2017: Cancer Science
https://www.readbyqxmd.com/read/29273315/staphylococcus-aureus-triggers-induction-of-mir-15b-5p-to-diminish-dna-repair-and-de-regulate-inflammatory-response-in-diabetic-foot-ulcers
#11
Horacio A Ramirez, Irena Pastar, Ivan Jozic, Olivera Stojadinovic, Rivka C Stone, Nkemcho Ojeh, Joel Gil, Stephen C Davis, Robert S Kirsner, Marjana Tomic-Canic
Diabetic foot ulcers (DFUs) are a debilitating complication of diabetes in which bacterial presence, including its frequent colonizer Staphylococcus aureus, contribute to inhibition of healing. MicroRNAs (miRs) play a role in healing and host response to bacterial pathogens. However, the mechanisms by which miR response to cutaneous S. aureus contributes to DFU pathophysiology are unknown. Herein we show S. aureus inhibits wound closure and induces miR-15b-5p in acute human and porcine wound models, and in chronic DFUs...
December 19, 2017: Journal of Investigative Dermatology
https://www.readbyqxmd.com/read/29258421/in-vivo-imaging-of-epithelial-wound-healing-in-the-cnidarian-clytia-hemisphaerica-demonstrates-early-evolution-of-purse-string-and-cell-crawling-closure-mechanisms
#12
Zach Kamran, Katie Zellner, Harry Kyriazes, Christine M Kraus, Jean-Baptiste Reynier, Jocelyn E Malamy
BACKGROUND: All animals have mechanisms for healing damage to the epithelial sheets that cover the body and line internal cavities. Epithelial wounds heal either by cells crawling over the wound gap, by contraction of a super-cellular actin cable ("purse string") that surrounds the wound, or some combination of the two mechanisms. Both cell crawling and purse string closure of epithelial wounds are widely observed across vertebrates and invertebrates, suggesting early evolution of these mechanisms...
December 19, 2017: BMC Developmental Biology
https://www.readbyqxmd.com/read/29240861/a-systematic-review-of-lower-lip-anatomy-mechanics-of-local-flaps-and-special-considerations-for-lower-lip-reconstruction
#13
Stefanos Boukovalas, Alexis L Boson, Joshua P Hays, C Helen Malone, Eric L Cole, Richard F Wagner
<p>Reconstruction of defects of the lower lip can be very challenging. The aim of this review is to analyze the unique characteristics of lower lip anatomy and provide a systematic approach for lower lip reconstruction. A review of current literature was performed using the PubMed database. Articles analyzing the anatomic and histologic characteristics of the lower lip, mechanics of local faps, and different lower lip recon-struction techniques were included. Articles focused on lower lip reconstruction with free faps were excluded...
December 1, 2017: Journal of Drugs in Dermatology: JDD
https://www.readbyqxmd.com/read/29240284/extracellular-matrix-stromal-vascular-fraction-gel-conditioned-medium-accelerates-wound-healing-in-a-murine-model
#14
Chengliang Deng, Yunfan He, Jingwei Feng, Ziqing Dong, Yao Yao, Hsiaopei Mok, Maohui Lin, Lu Feng
Conditioned medium (CM) is a new treatment modality in regenerative medicine and has shown a successful outcome in wound healing. We recently introduced extracellular matrix/stromal vascular fraction gel (ECM/SVF-gel), an adipose-derived stem cell and adipose native extracellular matrix-enriched product for cytotherapy. This study aimed to evaluate the effect of CM from ECM/SVF-gel (Gel-CM) on wound healing compared with the conventional CM from adipose tissue (Adi-CM) and stem cell (SVF-CM). In vitro wound healing effect of three CMs on keratinocytes and fibroblasts was evaluated in terms of proliferation property, migratory property, and extracellular matrix production...
December 14, 2017: Wound Repair and Regeneration
https://www.readbyqxmd.com/read/29212712/a-reversible-thermoresponsive-sealant-for-temporary-closure-of-ocular-trauma
#15
Niki Bayat, Yi Zhang, Paulo Falabella, Roby Menefee, John J Whalen, Mark S Humayun, Mark E Thompson
Open globe injuries are full-thickness injuries sustained to the eye wall (cornea or sclera), which cause immediate drops in intraocular pressure that may lead to retinal detachment and permanent vision loss if not treated rapidly after injury. The current standard of care for open globe injuries consists of suturing the margins closed, but the technique can be time-consuming, requires specialized training and equipment, and can lead to patient discomfort, abrasion, and infection from eye rubbing. We engineered an injectable, thermoresponsive sealant (TRS) and a custom tool to occlude open globe injuries...
December 6, 2017: Science Translational Medicine
https://www.readbyqxmd.com/read/29159427/shunt-revision-rates-in-myelomeningocele-patients-in-the-first-year-of-life-a-retrospective-study-of-52-patients
#16
Ibrahim Alatas, Gokhan Canaz, Nesrin Akkoyun Kayran, Nursu Kara, Huseyin Canaz
PURPOSE: Shunt placement indications are stringent and require confirmation of clinical and radiological evidence of hydrocephalus (HC). The aim of this study was to determine the rate of shunting and discuss the outcome in the first year of life in patients with myelomeningocele (MMC) on the basis of review of the literature. METHODS: All patients who underwent postnatal repair of MMC at our institution between March 2014 and March 2015 were evaluated. Patients were only included if they underwent both MMC repair and ventriculoperitoneal (VP) shunt insertion at our institution and were followed up for at least 12 months...
November 20, 2017: Child's Nervous System: ChNS: Official Journal of the International Society for Pediatric Neurosurgery
https://www.readbyqxmd.com/read/29158488/annexin-a4-and-a6-induce-membrane-curvature-and-constriction-during-cell-membrane-repair
#17
Theresa Louise Boye, Kenji Maeda, Weria Pezeshkian, Stine Lauritzen Sønder, Swantje Christin Haeger, Volker Gerke, Adam Cohen Simonsen, Jesper Nylandsted
Efficient cell membrane repair mechanisms are essential for maintaining membrane integrity and thus for cell life. Here we show that the Ca(2+)- and phospholipid-binding proteins annexin A4 and A6 are involved in plasma membrane repair and needed for rapid closure of micron-size holes. We demonstrate that annexin A4 binds to artificial membranes and generates curvature force initiated from free edges, whereas annexin A6 induces constriction force. In cells, plasma membrane injury and Ca(2+) influx recruit annexin A4 to the vicinity of membrane wound edges where its homo-trimerization leads to membrane curvature near the edges...
November 20, 2017: Nature Communications
https://www.readbyqxmd.com/read/29158265/topical-mevastatin-promotes-wound-healing-by-inhibiting-the-transcription-factor-c-myc-via-the-glucocorticoid-receptor-and-the-long-noncoding-rna-gas5
#18
Andrew P Sawaya, Irena Pastar, Olivera Stojadinovic, Sonja Lazovic, Stephen C Davis, Joel Gil, Robert S Kirsner, Marjana Tomic-Canic
Diabetic foot ulcers (DFU), a life-threatening complication of diabetes mellitus, have limited treatment options, often resulting in amputations. HMG-CoA reductase inhibitors such as statins are cholesterol-reducing agents that may provide a new therapeutic option. Statins target the cholesterol pathway and block the synthesis of the wound-healing inhibitors farnesyl pyrophosphate (FPP) and cortisol, ligands for the glucocorticoid receptor (GR). Here we demonstrate that the naturally occurring statin, mevastatin, reverses FPP's effects and promotes healing by using in vitro wound healing assays, human ex vivo and porcine in vivo wound models, and DFU tissue...
November 20, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29147897/vacuum-assisted-wound-closure-with-mesh-mediated-fascial-traction-achieves-better-outcomes-than-vacuum-assisted-wound-closure-alone-a-comparative-study
#19
Giuseppe Salamone, Leo Licari, Giovanni Guercio, Albert Comelli, Mirko Mangiapane, Nicolò Falco, Roberta Tutino, Noemi Bagarella, Sofia Campanella, Calogero Porrello, Roberto Gullo, Gianfranco Cocorullo, Gaspare Gulotta
BACKGROUND: Open abdomen (OA) permits the application of damage control surgery principles when abdominal trauma, sepsis, severe acute peritonitis and abdominal compartmental syndrome (ACS) occur. METHODS: Non-traumatic patients treated with OA between January 2010 and December 2015 were identified in a prospective database, and the data collected were retrospectively reviewed. Patients' records were collected from charts and the surgical and intensive care unit (ICU) registries...
November 16, 2017: World Journal of Surgery
https://www.readbyqxmd.com/read/29129266/single-cell-defects-cause-a-long-range-mechanical-response-in-a-confluent-epithelial-cell-layer
#20
Susanne Karsch, Deqing Kong, Jörg Großhans, Andreas Janshoff
Epithelial cells are responsible for tissue homeostasis and form a barrier to maintain chemical gradients and mechanical integrity. Therefore, rapid wound closure is crucial for proper tissue function and restoring homeostasis. In this study, the mechanical properties of cells surrounding a single-cell wound are investigated during closure of the defect. The single-cell wound is induced in an intact layer using micropipette action and responses in neighboring cells are monitored with atomic force microscopy...
November 9, 2017: Biophysical Journal
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