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Adhesive agent

Jinshan Guo, Gloria B Kim, Dingying Shan, Jimin P Kim, Jianqing Hu, Wei Wang, Fawzi G Hamad, Guoying Qian, Elias B Rizk, Jian Yang
For the first time, a convenient copper-catalyzed azide-alkyne cycloaddition (CuAAC, click chemistry) was successfully introduced into injectable citrate-based mussel-inspired bioadhesives (iCMBAs, iCs) to improve both cohesive and wet adhesive strengths and elongate the degradation time, providing numerous advantages in surgical applications. The major challenge in developing such adhesives was the mutual inhibition effect between the oxidant used for crosslinking catechol groups and the Cu(II) reductant used for CuAAC, which was successfully minimized by adding a biocompatible buffering agent typically used in cell culture, 4-(2-hydroxyethyl)-1-piperazineethanesulfonic acid (HEPES), as a copper chelating agent...
October 12, 2016: Biomaterials
Xiaohong Ruby Xu, Naadiya Carrim, Miguel Antonio Dias Neves, Thomas McKeown, Tyler W Stratton, Rodrigo Matos Pinto Coelho, Xi Lei, Pingguo Chen, Jianhua Xu, Xiangrong Dai, Benjamin Xiaoyi Li, Heyu Ni
Platelets are central mediators of thrombosis and hemostasis. At the site of vascular injury, platelet accumulation (i.e. adhesion and aggregation) constitutes the first wave of hemostasis. Blood coagulation, initiated by the coagulation cascades, is the second wave of thrombin generation and enhance phosphatidylserine exposure, can markedly potentiate cell-based thrombin generation and enhance blood coagulation. Recently, deposition of plasma fibronectin and other proteins onto the injured vessel wall has been identified as a new "protein wave of hemostasis" that occurs prior to platelet accumulation (i...
2016: Thrombosis Journal
Menaga Ilangkovan, Ibrahim Jantan, Syed Nasir Abbas Bukhari
BACKGROUND: Phyllanthin found in many Phyllanthus species has various biochemical and pharmacological properties especially on its hepatoprotective effects. However, its effect on the immune system has not been well documented. PURPOSE: In the present study, phyllanthin isolated from Phyllanthus amarus was investigated for its immunosuppressive effects on various cellular and humoral immune responses in Balb/C mice. METHODS: Male mice were treated daily at 20, 40 and 100mg/kg of phyllanthin for 14 days by oral gavage...
November 15, 2016: Phytomedicine: International Journal of Phytotherapy and Phytopharmacology
Babak Pourmollaabbassi, Saeed Karbasi, Batool Hashemibeni
BACKGROUND: The generation of bioartificial bone tissues may help to overcome the problems related to donor site morbidity and size limitations. MATERIALS AND METHODS: In this paper, hydroxyapatite (HA) powder was made out of bovine bone by thermal analysis at 900°C and first, and then, porous HA (50 weight percentage) was produced by polyurethane sponge replication method. In order to improve the scaffold mechanical properties, they have been coated with poly hydroxybutyrate...
2016: Advanced Biomedical Research
Lorenzo Teodonio, Mauro Missori, Dominika Pawcenis, Joanna Łojewska, Francesco Valle
Mapping the morphological and nano-mechanical properties of cellulose fibers within paper sheets or textile products at the nano-scale level by using atomic force microscopy is a challenging task due to the huge surface level variation of these materials. However this task is fundamental for applications in forensic or cultural heritage sciences and for the industrial characterization of materials. In order to correlate between nano-mechanical properties and local nanometer scale morphology of different layers of cellulose fibers, a new strategy to prepare samples of isolated cellulose fibers was designed...
October 5, 2016: Micron: the International Research and Review Journal for Microscopy
Yang Cheng, Feng Lu, Bo Wang, Jian Li, Jin-Hee Han, Daisuke Ito, Deok-Hoon Kong, Lubin Jiang, Jian Wu, Kwon-Soo Ha, Eizo Takashima, Jetsumon Sattabongkot, Jun Cao, Myat Htut Nyunt, Myat Phone Kyaw, Sanjay A Desai, Louis H Miller, Takafumi Tsuboi, Eun-Taek Han
Plasmodium vivax, a major agent of malaria in both temperate and tropical climates, has been thought to be unable to infect humans lacking the Duffy (Fy) blood group antigen because this receptor is critical for erythrocyte invasion. Recent surveys in various endemic regions, however, have reported P. vivax infections in Duffy-negative individuals, suggesting that the parasite may utilize alternative receptor-ligand pairs to complete the erythrocyte invasion. Here, we identified and characterized a novel parasite ligand, Plasmodium vivax GPI-anchored micronemal antigen (PvGAMA), that bound human erythrocytes regardless of Duffy antigen status...
October 19, 2016: Scientific Reports
Sanmuga Priya Ekambaram, Senthamil Selvan Perumal, Ajay Balakrishnan, Nathiya Marappan, Sabari Srinivasan Gajendran, Vinodhini Viswanathan
AIM/BACKGROUND: Medicinal plants have ability to resist microorganisms by synthesizing secondary metabolites such as phenols. Rosmarinic acid (RA) is a phenylpropanoid widely distributed in plants and well known as therapeutic and cosmetic agent. Methicillin-resistant Staphylococcus aureus (MRSA) which is resistant to all kinds of β-lactams, threatens even most potent antibiotics. To improve the efficiency of antibiotics against multi-drug resistant bacteria and to reduce the antibiotic dose, the antibacterial activity and the synergistic effect of RA with standard antibiotics against S...
September 2016: Journal of Intercultural Ethnopharmacology
Andreas H Teuschl, Johannes Zipperle, Carina Huber-Gries, David L Kaplan
The control of bleeding is one of the most important interventions after a traumatic injury. Hemostatic devices delivering blood clotting accelerating agents such as fibrinogen are increasingly used due to their efficacy and their ease of application. In the present study, we describe a method to incorporate the coagulant supplements fibrinogen and thrombin in silk protein sponges by mixing the coagulants with an aqueous silk solution, followed by molding, freeze-drying and water annealing. In this combination system we demonstrate the delivery of fibrinogen while maintaining its hemostatic potential...
October 18, 2016: Journal of Biomedical Materials Research. Part A
Ji-Huang Li, Zi-Xian Chen, Xiao-Guang Zhang, Yan Li, Wen-Ting Yang, Xia-Wei Zheng, Shuang Chen, Lin Lu, Yong Gu, Guo-Qing Zheng
BACKGROUND: Chinese herbal medicine (CHM) has been used to treat stroke for thousands of years. The objective of the study is to assess the current evidence for bioactive components of CHM as neurogenesis agent in animal models of ischemic stroke. METHODS: We searched PubMed, China National Knowledge Infrastructure, WanFang Database, and VIP Database for Chinese Technical Periodicals published from the inception up to November 2015. The primary measured outcome was one of neurogenesis biomarker, including Bromodeoxyuridine (BrdU), Nestin, doublecortin (DCX), polysialylated form of the neural cell adhesion molecule (PSA-NCAM), neuronal nuclear antigen (NeuN), and glial fibrillary acidic protein (GFAP)...
October 2016: Medicine (Baltimore)
Anahita Javaheri, Tobias Kruse, Kristof Moonens, Raquel Mejías-Luque, Ayla Debraekeleer, Carmen I Asche, Nicole Tegtmeyer, Behnam Kalali, Nina C Bach, Stephan A Sieber, Darryl J Hill, Verena Königer, Christof R Hauck, Roman Moskalenko, Rainer Haas, Dirk H Busch, Esther Klaile, Hortense Slevogt, Alexej Schmidt, Steffen Backert, Han Remaut, Bernhard B Singer, Markus Gerhard
Helicobacter pylori specifically colonizes the human gastric epithelium and is the major causative agent for ulcer disease and gastric cancer development. Here, we identify members of the carcinoembryonic antigen-related cell adhesion molecule (CEACAM) family as receptors of H. pylori and show that HopQ is the surface-exposed adhesin that specifically binds human CEACAM1, CEACAM3, CEACAM5 and CEACAM6. HopQ-CEACAM binding is glycan-independent and targeted to the N-domain. H. pylori binding induces CEACAM1-mediated signalling, and the HopQ-CEACAM1 interaction enables translocation of the virulence factor CagA into host cells and enhances the release of pro-inflammatory mediators such as interleukin-8...
October 17, 2016: Nature Microbiology
Anar Gojayev, Diana P English, Matthew Macer, Masoud Azodi
Background. Pelvic inflammatory disease (PID) rarely results in diffuse ascites. Severe adhesive disease secondary to PID may lead to the formation of inclusion cysts and even pelvic peritoneal nodularity due to postinflammatory scarring and cause an elevation of serum CA-125 levels. The constellation of these findings may mimic an ovarian neoplasm. Case. We report a case of a 22-year-old female who presented with multiple pelvic cysts and diffuse ascites due to Chlamydia trachomatis infection. The initial gynecologic exam did not reveal obvious evidence of PID; however, a positive Chlamydia trachomatis test, pathologic findings, and the exclusion of other etiologies facilitated the diagnosis...
2016: Case Reports in Obstetrics and Gynecology
Jaymit Patel, Clare Granger, Sandra Parker, Mangala Patel
OBJECTIVES: This in-vitro study investigated the effect of 'instrument lubricants' used during placement of composite restorative material, on the diametral tensile strength (DTS) and water uptake of composite specimens. METHODS: 300 posterior composite cylindrical specimens were manufactured: 60 with each instrument lubricant (ethanol, 3-step, 2-step and 1-step 'bonding agent') and 60 with no lubricant (controls). Each set of 60 specimens was evenly allocated to one of the following test groups (n=100/group): Group 1 - tested for DTS immediately after manufacture; Groups 2 and 3 - tested for DTS after immersion in phosphate-buffered saline (PBS) for 1 and 12-weeks respectively, using a Universal Instron machine...
October 13, 2016: Journal of Dentistry
Yuan Ma, Jia-Xiang Zhang, Ya-Nan Liu, Ai Ge, Hao Gu, Wang-Jian Zha, Xiao-Ning Zeng, Mao Huang
In the pathophysiology of asthma, structural cell dysfunction and concomitant microenvironment changes in airways are crucial to pathological progression, which involves oxidative stress. Caffeic acid phenethyl ester (CAPE) is an active anti-oxidative component obtained from propolis, and has been shown to have beneficial effects on several respiratory disorders, such as chronic obstructive pulmonary disease and lung cancer. However, the impact of CAPE on asthma is not well understood. Therefore, this study investigated the advantages of using CAPE to treat asthma and demonstrated the roles of CAPE in the regulation of airway microenvironments...
October 13, 2016: Free Radical Biology & Medicine
Kristen Jijelava, Hongvan Le, Jack Parker, Jeffrey Yee
BACKGROUND: Ocular chemical injuries due to accidental exposure or application of cyanoacrylate, commonly known as "superglue," have increased over the past 30 years. However, current treatment options to relieve eyelid adhesions due to cyanoacrylate applications are difficult to successfully execute and can require sedation or general anesthesia. Here we describe a simple technique to release eyelid adhesions due to cyanoacrylate, or other adhesive agents, that can be successfully performed at bedside without sedation...
October 13, 2016: Journal of Emergency Medicine
Marcus J Goudie, Benjamin M Brainard, Chad W Schmeidt, Hitesh Handa
Infection and thrombosis are the two leading complications associated with blood contacting medical devices, and have led to active materials that can delivery antibiotics or antithrombotic agents. Two key characteristics of these materials are the ability to produce controlled delivery, as well as minimal systemic delivery of the agent outside of the device site. Nitric oxide (NO) releasing materials are attractive as NO plays pivotal roles in the body's natural defense against bacterial infection, as well as regulation of platelet adhesion and activation...
October 14, 2016: Journal of Biomedical Materials Research. Part A
Eon Jeong Nam, Jin Hee Kang, Keum Hee Sa, Shijin Sung, Jae Yong Park, Dong-Gyu Jo, Jae Hyung Park, In San Kim, Young Mo Kang
OBJECTIVE: Therapeutic agents that are transformable via introducing cleavable linkage by locally enriched MMP-2 within inflamed synovium would enhance therapeutic efficacy on chronic inflammatory arthritis. Transforming growth factor-β-inducible gene-h3 (βig-h3), which consists of four fas-1 domains and an Arg-Gly-Asp (RGD) motif, intensifies inflammatory processes by facilitating adhesion and migration of fibroblast-like synoviocyte in the pathogenesis of rheumatoid arthritis (RA)...
2016: PloS One
Chu Gong, Caicai Lu, Bingqiang Li, Meng Shan, Guolin Wu
Hydrogel systems based on cross-linked polymeric materials with adhesive properties in wet environments have been considered as promising candidates for tissue adhesives. The 3,4-dihydroxyphenylalanine (DOPA) is believed to be responsible for the water-resistant adhesive characteristics of mussel adhesive proteins. Under the inspiration of DOPA containing adhesive proteins, a dopamine-modified poly(α,β-aspartic acid) derivative (PDAEA) was successfully synthesized by successive ring-opening reactions of polysuccinimide (PSI) with dopamine and ethanolamine, and an injectable bioadhesive hydrogel was prepared via simply mixing PDAEA and FeCl3 solutions...
October 14, 2016: Journal of Biomedical Materials Research. Part A
Yahya Baltu, Hakan Uzun, Guzin Yesim Özgenel
BACKGROUND: The postoperative development of epineural and extraneural scar tissue adversely affects peripheral nerve surgery outcomes. Although several surgical methods, pharmacological agents, and chemical materials have been used to prevent epineural scar formation in both clinical and experimental models, the results are still unsatisfactory. The purpose of this study was to investigate the efficacy of buccal mucosa graft (BMG) wrapping on epineural scarring in an adult rat model...
October 14, 2016: Journal of Plastic Surgery and Hand Surgery
Stefano Mancini, Carmen Menzi, Frank Oechslin, Philippe Moreillon, José Manuel Entenza
Streptococcus gordonii and related species of oral viridans group streptococci (VGS) are common etiological agents of infective endocarditis (IE). We explored vaccination as a strategy to prevent VGS- IE, using a novel antigen presenting system based on non-genetically modified Lactococcus lactis displaying vaccinogens on its surface.Hsa and PadA are surface-located S. gordonii proteins implicated in platelet adhesion and aggregation, which are key steps in the pathogenesis of IE. This function makes them ideal targets for vaccination against VGS- IE...
October 10, 2016: Infection and Immunity
Elizabeth J Brisbois, Maria Kim, Xuewei Wang, Azmath Mohammed, Terry C Major, Jianfeng Wu, Jessica Brownstein, Chuanwu Xi, Hitesh Handa, Robert H Bartlett, Mark E Meyerhoff
Blood-contacting devices, such as intravascular catheters, suffer from challenges related to thrombus formation and infection. Nitric oxide (NO) is an endogenous antiplatelet and antimicrobial agent. Exogenous release of NO from various polymer matrices has been shown to reduce thrombosis and infection of/on implantable medical devices. However, the clinical applications of such materials have been hindered due to factors such as NO donor leaching and thermal instability. In this study, a novel approach is demonstrated in which one lumen of commercial dual lumen catheters is dedicated to the NO release chemistry, allowing the other lumen to be available for clinical vascular access...
October 13, 2016: ACS Applied Materials & Interfaces
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