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https://www.readbyqxmd.com/read/29223703/the-foreign-body-response-and-morphometric-changes-associated-with-mesh-style-peripheral-nerve-cuffs
#1
Michael B Christensen, Patrick A Tresco
Nerve cuffs have been used to anchor and protect penetrating electrodes in peripheral nerves and have been used as non-penetrating electrodes for neural recording and nerve stimulation. The material of choice for such applications is silicone, an inert synthetic biomaterial which elicits a minimal chronic foreign body response (FBR). While histological studies of solid silicone cuffs are available, to the best of our knowledge a comparison to other cuff designs is not well documented. Here, we describe the FBR and morphological changes that accompany nerve cuff implantation in the rat sciatic nerve by comparing a metallic mesh with and without a parylene coating to one made of silicone...
December 6, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/29211449/novel-reduced-graphene-oxide-zinc-silicate-calcium-silicate-electroconductive-biocomposite-for-stimulating-osteoporotic-bone-regeneration
#2
Kun Xiong, Tingting Wu, Qingbo Fan, Lin Chen, Minhao Yan
In the absence of external assistance autogenous healing of bone fracture is difficult due to an impaired regeneration ability under osteoporosis pathological condition. In this study, a reduced graphene oxide-zinc silicate-calcium silicate (RGO-ZS-CS) conductive biocomposite with an optimal surface electroconductivity of 5625 S/m was prepared by a two-step spin-coating method. The presence of lamellar apatite nanocrystals on the surfaces of the biocomposite, suggest that it has good in vitro biomineralization compatability...
December 6, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29117574/an-astrocyte-derived-extracellular-matrix-coating-reduces-astrogliosis-surrounding-chronically-implanted-microelectrode-arrays-in-rat-cortex
#3
Robert S Oakes, Michael D Polei, John L Skousen, Patrick A Tresco
Available evidence suggests that the magnitude of the foreign body response (FBR) to implants placed in cortical brain tissue is affected by the extent of vasculature damage following device insertion and the magnitude of the ensuing macrophage response. Since the extracellular matrix (ECM) serves as a natural hemostatic and immunomodulatory agent, we examined the ability of an FDA-approved neurosurgical hemostatic coating and an ECM coating derived from primary rat astrocytes to reduce the FBR surrounding a penetrating microelectrode array chronically implanted in rat cortex...
October 29, 2017: Biomaterials
https://www.readbyqxmd.com/read/29079028/modulating-effect-of-mgo-sio2-nanoparticles-on-immunological-and-histopathological-alterations-induced-by-aflatoxicosis-in-rats
#4
Sara S Essa, Eiman M El-Saied, Osama S El-Tawil, Manal B Mahmoud, Sahar S Abd El-Rahman
INTRODUCTION: AflatoxinB1 (AFB1) is well-known as a feed borne-hepatotoxic and immunosuppressive mycotoxin. This study was conducted to evaluate the efficacy of nanocomposite magnesium oxide and silicon oxide (MgO-SiO2) in reducing the toxic effects of AFB1on the immunity and histological alterations in liver, spleen and intestine of adult male rats. EXPERIMENTAL DESIGN: Animals were divided into a control (Gp1) and three experimental groups (Gps); Gp2 received feed contained 200 ppb AFB1, Gp3 received feed contained 200 ppb AFB1 and 0...
October 25, 2017: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/29062167/characterization-of-the-foreign-body-response-to-common-surgical-biomaterials-in-a-murine-model
#5
Mohamed Ibrahim, Jennifer Bond, Manuel A Medina, Lei Chen, Carlos Quiles, George Kokosis, Latif Bashirov, Bruce Klitzman, Howard Levinson
BACKGROUND: Implanted biomaterials are subject to a significant reaction from the host, known as the foreign body response (FBR). We quantified the FBR to five materials following subcutaneous implantation in mice. MATERIALS AND METHODS: Polyvinyl alcohol (PVA) and silicone sheets are considered highly biocompatible biomaterials and were cut into 8mm-diameter disks. Expanded PTFE (ePTFE)and polypropylene are also widely used biocompatible biomaterials and were cut into 2cm-long cylinders...
November 2017: European Journal of Plastic Surgery
https://www.readbyqxmd.com/read/29062065/a-chloroquine-induced-macrophage-preconditioning-strategy-for-improved-nanodelivery
#6
Joy Wolfram, Sara Nizzero, Haoran Liu, Feng Li, Guodong Zhang, Zheng Li, Haifa Shen, Elvin Blanco, Mauro Ferrari
Site-specific localization is critical for improving the therapeutic efficacy and safety of drugs. Nanoparticles have emerged as promising tools for localized drug delivery. However, over 90% of systemically injected nanocarriers typically accumulate in the liver and spleen due to resident macrophages that form the mononuclear phagocyte system. In this study, the clinically approved antimalarial agent chloroquine was shown to reduce nanoparticle uptake in macrophages by suppressing endocytosis. Pretreatment of mice with a clinically relevant dose of chloroquine substantially decreased the accumulation of liposomes and silicon particles in the mononuclear phagocyte system and improved tumoritropic and organotropic delivery...
October 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29044021/-asia-syndrome-breast-implant-and-still-s-disease
#7
Cristhian Armenteros, Andrea Odzak, Florencia Arcondo, Marcela De Dios Soler, Tatiana Sinigier, Marcelo Zylberman
Connective tissue diseases associated with silicone breast implants have been widely discussed. In the last decade, siliconosis has been included in the autoimmune/inflammatory syndrome induced by adjuvants (ASIA) next to Gulf War syndrome, macrophage myofascitis and postvaccination phenomena. The ASIA syndrome may appear as lupus, rheumatoid arthritis, or more rarely, as adult Still's disease. We discuss the case of a patient with prolonged fever and clinical criteria for ASIA and Still's disease. The prostheses were resected and pathology showed absence of breast implant associated anaplastic lymphoma ALK (-)...
2017: Medicina
https://www.readbyqxmd.com/read/28987879/thioaptamer-targeted-discoidal-microparticles-increase-self-immunity-and-reduce-mycobacterium-tuberculosis-burden-in-mice
#8
Fransisca Leonard, Ngan P Ha, Preeti Sule, Jenolyn F Alexander, David E Volk, Ganesh L R Lokesh, Xuewu Liu, Jeffrey D Cirillo, David G Gorenstein, Jinyun Yuan, Soumya Chatterjee, Edward A Graviss, Biana Godin
Worldwide, tuberculosis (TB) remains one of the most prevalent infectious diseases causing morbidity and death in >1.5 million patients annually. Mycobacterium tuberculosis (Mtb), the etiologic agent of TB, usually resides in the alveolar macrophages. Current tuberculosis treatment methods require more than six months, and low compliance often leads to therapeutic failure and multidrug resistant strain development. Critical to improving TB-therapy is shortening treatment duration and increasing therapeutic efficacy...
November 28, 2017: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/28865177/surface-topography-of-silicon-nitride-affects-antimicrobial-and-osseointegrative-properties-of-tibial-implants-in-a-murine-model
#9
Masahiro Ishikawa, Karen L de Mesy Bentley, Bryan J McEntire, B Sonny Bal, Edward M Schwarz, Chao Xie
While silicon nitride (Si3 N4 ) is an antimicrobial and osseointegrative orthopaedic biomaterial, the contribution of surface topography to these properties is unknown. Using a methicillin-resistant strain of Staphylococcus aureus (MRSA), this study evaluated Si3 N4 implants in vitro utilizing scanning electron microscopy (SEM) with colony forming unit (CFU) assays, and later in an established in vivo murine tibia model of implant-associated osteomyelitis. In vitro, the "as-fired" Si3 N4 implants displayed significant reductions in adherent bacteria versus machined Si3 N4 (2...
December 2017: Journal of Biomedical Materials Research. Part A
https://www.readbyqxmd.com/read/28855120/sio2-induced-release-of-svegfrs-from-pulmonary-macrophages
#10
Jie Chao, Yan Lv, Jin Chen, Jing Wang, Honghong Yao
BACKGROUND: The inhalation of silicon dioxide (SiO2) particles causes silicosis, a stubborn pulmonary disease that is characterized by alveolar inflammation during the early stage. Soluble cytokine receptors (SCRs) play important roles in regulating inflammation by either attenuating or promoting cytokine signaling. However, the role of SCRs in silicosis remains unknown. METHODS AND RESULTS: Luminex assays revealed increased soluble vascular endothelial growth factor receptor (sVEGFR) family levels in the plasma of silicosis patients...
August 30, 2017: Respiratory Physiology & Neurobiology
https://www.readbyqxmd.com/read/28802207/the-effect-of-aluminium-and-sodium-impurities-on-the-in-vitro-toxicity-and-pro-inflammatory-potential-of-cristobalite
#11
C Nattrass, C J Horwell, D E Damby, D Brown, V Stone
BACKGROUND: Exposure to crystalline silica (SiO2), in the form of quartz, tridymite or cristobalite, can cause respiratory diseases, such as silicosis. However, the observed toxicity and pathogenicity of crystalline silica is highly variable. This has been attributed to a number of inherent and external factors, including the presence of impurities. In cristobalite-rich dusts, substitutions of aluminium (Al) for silicon (Si) in the cristobalite structure, and impurities occluding the silica surface, have been hypothesised to decrease its toxicity...
November 2017: Environmental Research
https://www.readbyqxmd.com/read/28697402/functional-biocompatibility-testing-of-silicone-breast-implants-and-a-novel-classification-system-based-on-surface-roughness
#12
S Barr, E W Hill, A Bayat
PURPOSE: Increasing numbers of women undergo breast implantation for cosmetic and reconstructive purposes. Contracture of the fibrous capsule, which encases the implant leads to significant pain and reoperation. Texture, wettability and the cellular reaction to implant surfaces are poorly understood determinants of implant biocompatibility. The aim of this study was to evaluate the in-vitro characteristics of a range of commercial available implants using a macrophage based assay of implant biocompatibility and a quantitative assessment of wettability and texture...
June 27, 2017: Journal of the Mechanical Behavior of Biomedical Materials
https://www.readbyqxmd.com/read/28670313/macrophage-polarization-contributes-to-the-anti-tumoral-efficacy-of-mesoporous-nanovectors-loaded-with-albumin-bound-paclitaxel
#13
Fransisca Leonard, Louis T Curtis, Matthew James Ware, Taraz Nosrat, Xuewu Liu, Kenji Yokoi, Hermann B Frieboes, Biana Godin
Therapies targeted to the immune system, such as immunotherapy, are currently shaping a new, rapidly developing branch of promising cancer treatments, offering the potential to change the prognosis of previously non-responding patients. Macrophages comprise the most abundant population of immune cells in the tumor microenvironment (TME) and can undergo differentiation into functional phenotypes depending on the local tissue environment. Based on these functional phenotypes, tumor-associated macrophages (TAMs) can either aid tumor progression (M2 phenotype) or inhibit it (M1 phenotype)...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28538471/foreign-body-response-to-silicone-in-cochlear-implant-electrodes-in-the-human
#14
Jennifer T O'Malley, Barbara J Burgess, Donald Galler, Joseph B Nadol
HYPOTHESIS: Silicone as part of a cochlear implant electrode may be responsible for a foreign body response in the human. BACKGROUND: Clinical evidence of a foreign body response to a cochlear implant has been reported. In a previous study, particulate material found within the fibrous sheath and within macrophages surrounding a cochlear implant has been identified as being consistent with platinum. However, to date, there has been no histologic evidence of a role for silicone in this cellular immune response...
August 2017: Otology & Neurotology
https://www.readbyqxmd.com/read/28490729/a-comparative-multi-parametric-in-vitro-model-identifies-the-power-of-test-conditions-to-predict-the-fibrotic-tendency-of-a-biomaterial
#15
Maren Jannasch, Sabine Gaetzner, Tobias Weigel, Heike Walles, Tobias Schmitz, Jan Hansmann
Despite growing effort to advance materials towards a low fibrotic progression, all implants elicit adverse tissue responses. Pre-clinical biomaterial assessment relies on animals testing, which can be complemented by in vitro tests to address the Russell and Burch's 3R aspect of reducing animal burden. However, a poor correlation between in vitro and in vivo biomaterial assessments confirms a need for suitable in vitro biomaterial tests. The aim of the study was to identify a test setting, which is predictive and might be time- and cost-efficient...
May 10, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28470152/histological-evaluation-of-flexible-neural-implants-flexibility-limit-for-reducing-the-tissue-response
#16
Heui Chang Lee, Fredrik Ejserholm, Janak Gaire, Seth Currlin, Jens Schouenborg, Lars Wallman, Martin Bengtsson, Kinam Park, Kevin J Otto
OBJECTIVE: Flexible neural probes are hypothesized to reduce the chronic foreign body response (FBR) mainly by reducing the strain-stress caused by an interplay between the tethered probe and the brain's micromotion. However, a large discrepancy of Young's modulus still exists (3-6 orders of magnitude) between the flexible probes and the brain tissue. This raises the question of whether we need to bridge this gap; would increasing the probe flexibility proportionally reduce the FBR? APPROACH: Using novel off-stoichiometry thiol-enes-epoxy (OSTE+) polymer probes developed in our previous work, we quantitatively evaluated the FBR to four types of probes with different softness: silicon (~150 GPa), polyimide (1...
June 2017: Journal of Neural Engineering
https://www.readbyqxmd.com/read/28456077/chitosan-degradation-products-facilitate-peripheral-nerve-regeneration-by-improving-macrophage-constructed-microenvironments
#17
Yahong Zhao, Yongjun Wang, Jiahuan Gong, Liu Yang, Changmei Niu, Xuejun Ni, Yaling Wang, Su Peng, Xiaosong Gu, Cheng Sun, Yumin Yang
Chitosan-based artificial nerve grafts have been widely employed to repair peripheral nerve defects. Our previous study has shown that chitosan constructed nerve graft not only provides suitable scaffolds for nerve regeneration, its degradation products, chitooligosaccharides (COS), also promote nerve repair. However, the involved mechanisms are still not fully elucidated. In the present study, we observed that pro-inflammatory cytokines, as well as macrophage infiltration, were transiently up-regulated in the injured sciatic nerves which were bridged with silicon tubes filled with COS...
February 22, 2017: Biomaterials
https://www.readbyqxmd.com/read/28399878/sio2-and-tio2-nanoparticles-synergistically-trigger-macrophage-inflammatory-responses
#18
Misato Tsugita, Nobuyuki Morimoto, Masafumi Nakayama
Silicon dioxide (SiO2) nanoparticles (NPs) and titanium dioxide (TiO2) NPs are the most widely used inorganic nanomaterials. Although the individual toxicities of SiO2 and TiO2 NPs have been extensively studied, the combined toxicity of these NPs is much less understood. In this study, we observed unexpected and drastic activation of the caspase-1 inflammasome and production of IL-1β in mouse bone marrow-derived macrophages stimulated simultaneously with SiO2 and TiO2 NPs at concentrations at which these NPs individually do not cause macrophage activation...
April 11, 2017: Particle and Fibre Toxicology
https://www.readbyqxmd.com/read/28377320/do-il-3-gm-csf-effect-on-the-myofibroblastic-differentiation-of-human-adipose-derived-stromal-cells
#19
Jae-Sun Lee, Son-Seung Tae, Deok-Yeol Kim, Seung-Kyu Han, Woo-Kyung Kim, Eun-Sang Dhong
BACKGROUND: Capsular contracture is an incurable complication after silicone-based implant surgery. Myofibroblast is the predominant cell in the contracted capsule. We hypothesized that human adipose derive stromal cells (hASCs) together with fibroblast may show a similar phenotypic characteristics of myofibroblast after the treatment of inflammatory cytokines in vitro. MATERIALS AND METHODS: Interleukin 3 (IL-3) and granulocyte macrophage colony stimulating factor (GM-CSF) were treated in the culture of hASCs and HDFs...
June 15, 2017: Experimental Cell Research
https://www.readbyqxmd.com/read/28213286/investigation-of-silicon-carbon-nitride-nanocomposite-films-as-a-wear-resistant-layer-in-vitro-and-in-vivo-for-joint-replacement-applications
#20
Y Liang, D G Liu, W Q Bai, J P Tu
Silicon-contained CNx nanocomposite films were prepared using the ion beam assisted magnetron sputtering under different nitrogen gas pressure. With increase of the nitrogen pressure, silicon and nitrogen content of the CNx films drastically increase, and is saturated as the PN2 reach about 40%. Surface roughness and the contact angle are increase, while the friction coefficient decreased. The CNx film with 5.7at.% Si content possess the lowest friction coefficient of only 0.07, and exhibited the best tribological properties...
May 1, 2017: Colloids and Surfaces. B, Biointerfaces
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