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      Estudo experimental da resposta tecidual à presença de celulose produzida por Acetobacter xylinum no dorso nasal de coelhos Translated title: Experimental study of the tissue reaction caused by the presence of cellulose produced by Acetobacter Xylinum in the nasal dorsum of rabbits

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          Abstract

          Vários materiais são propostos para reconstrução nasal, não havendo consenso sobre qual o melhor. A manta de celulose produzida por bactéria pode ser mais um elemento para adição cartilaginosa. Não há estudos deste material no dorso nasal. OBJETIVO: Avaliar a resposta tecidual à presença da celulose bacteriana no dorso nasal de coelhos. MATERIAL E MÉTODO: Foram utilizados 22 coelhos Nova Zelândia, sendo que em 20 deles foi implantada a manta de celulose no dorso nasal e em 2 controles nada foi feito. Foram acompanhados por um período de três e seis meses, sendo então retirados as regiões do dorso nasal e narinas dos coelhos e realizado estudo histopatológico levando em consideração parâmetros definidos de condição inflamatória como congestão vascular, intensidade do processo inflamatório e presença de exsudato purulento. RESULTADOS: O processo inflamatório manteve-se estável, demonstrando sua relação com o procedimento cirúrgico, e não com a presença da manta de celulose. Nos demais parâmetros estudados não houve diferença estatisticamente significante. CONCLUSÃO: A manta de celulose de Acetobacter xylinum mostrou boa biocompatibilidade e manteve-se estável no decorrer do tempo de estudo, podendo ser considerada um bom material para uso na elevação do dorso nasal.

          Translated abstract

          Several materials have been proposed for nasal reconstruction. There is no consensus on which is the best. The cellulose blanket produced by bacteria may be a possible cartilaginous addition element to the nose. AIM: to study tissue reaction to cellulose in the dorsal nose of rabbits. MATERIALS AND METHODS: 22 New Zealand rabbits were used. In 20 a cellulose blanket was implanted in the nasal dorsum and 2 served as controls. They were followed up through a period of three and six months, after which their nostrils and nasal dorsums were removed and histological studies were carried out on them, considering defined parameters of inflammation such as vascular congestion, intensity of the inflammatory process and presence of purulent exudate. RESULTS: The inflammatory process remained stable, showing its relationship with the surgical procedure and not with the presence of the cellulose blanket. There were no statistical differences in the other parameters. CONCLUSION: The cellulose blanket produced by Acetobacter xylinum presented good biocompatibility, remained stable during the entire study period, and could be considered a good material for elevating the nasal dorsum.

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          The role of oxidised regenerated cellulose/collagen in chronic wound repair and its potential mechanism of action.

          Normal wound healing is a carefully controlled balance of destructive processes necessary to remove damaged tissue and repair processes which lead to new tissue formation. Proteases and growth factors play a pivotal role in regulating this balance, and if disrupted in favour of degradation then delayed healing ensues; a trait of chronic wounds. Whilst there are many types of chronic wounds, biochemically they are thought to be similar in that they are characterised by a prolonged inflammatory phase, which results in elevated levels of proteases and diminished growth factor activity. This increase in proteolytic activity and subsequent degradation of growth factors is thought to contribute to the net tissue loss associated with these chronic wounds. In this study, we describe a new wound treatment, comprising oxidised regenerated cellulose and collagen (ORC/collagen), which can redress this imbalance and modify the chronic wound environment. We demonstrate that ORC/collagen can inactivate potentially harmful factors such as proteases, oxygen free radicals and excess metal ions present in chronic wound fluid, whilst simultaneously protecting positive factors such as growth factors and delivering them back to the wound. These characteristics suggest a beneficial role for this material in helping to re-balance the chronic wound environment and therefore promote healing.
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            The role of oxidised regenerated cellulose/collagen in wound repair: effects in vitro on fibroblast biology and in vivo in a model of compromised healing.

            Irrespective of underlying chronic wound pathology, delayed wound healing is normally characterised by impaired new tissue formation at the site of injury. It is thought that this impairment reflects both a reduced capacity to synthesize new tissue and the antagonistic activities of high levels of proteinases within the chronic wound environment. Historically, wound dressings have largely been passive devices that offer the wound interim barrier function and establish a moist healing environment. A new generation of devices, designed to interact with the wound and promote new tissue formation, is currently being developed and tested. This study considers one such device, oxidised regenerated cellulose (ORC) /collagen, in terms of its ability to promote fibroblast migration and proliferation in vitro and to accelerate wound repair in the diabetic mouse, a model of delayed wound healing. ORC/collagen was found to promote both human dermal fibroblasts proliferation and cell migration. In vivo studies considered the closure and histological characteristics of diabetic wounds treated with ORC/collagen compared to those of wounds given standard treatment on both diabetic and non-diabetic mice. ORC/collagen was found to significantly accelerate diabetic wound closure and result in a measurable improvement in the histological appearance of wound tissues. As the diabetic mouse is a recognised model of impaired healing, which may share some characteristics of human chronic wounds, the results of this in vivo study, taken together with those relating the positive effects of ORC/collagen in vitro, may predict the beneficial use of this device in the clinical setting.
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              Tympanic membrane repair with a dermal allograft.

              To assess the use of an acellular dermal allograft in the repair of chronic tympanic membrane perforations. Chronic tympanic membrane perforations are a common problem in otolaryngology, and although surgical tympanoplasty using either temporalis fascia or rice paper has proven to be highly successful, these materials are not without their own limitations. The search has continued for a simpler, yet equally effective, means of repairing persistent tympanic membrane perforations in an office setting. In this study we experimentally evaluated the use of an acellular dermis (AlloDerm, (LifeCell Corporation, The Woodlands, TX) as an alternative to traditional tympanoplasty materials. Prospective study using 28 adult chinchillas. Subtotal tympanic membrane perforations were created bilaterally in 28 adult chinchillas. Animals with noninfected, stable perforations that showed no signs of epithelial regeneration after 5 to 8 weeks were used to compare the use of rice paper patch with AlloDerm in patch tympanoplasties. Eighteen of 23 tympanoplasties (78%) that were performed using AlloDerm showed no signs of perforation after 5 to 6 weeks. In those performed using rice paper control, 14 of 21 (66%) showed no signs of perforation after 5 to 6 weeks. In addition, histological evaluation of the healed tympanic membranes demonstrated that the acellular dermis had been incorporated within the middle fibrous layer of the tympanic membrane. The results and histological studies suggest that acellular dermis may be a suitable alternative to traditional materials currently used for patch tympanoplasty. Future studies to evaluate the efficacy of acellular dermis in humans are warranted.
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                Author and article information

                Journal
                rboto
                Revista Brasileira de Otorrinolaringologia
                Rev. Bras. Otorrinolaringol.
                ABORL-CCF Associação Brasileira de Otorrinolaringologia e Cirurgia Cérvico-Facial (São Paulo, SP, Brazil )
                0034-7299
                April 2009
                : 75
                : 2
                : 200-207
                Affiliations
                [01] orgnameSanta casa de São Paulo
                [02] orgnameSanta casa de São Paulo orgdiv1programa de Pós-Graduação em ORL Depto. de Otorrinolaringologia
                [03] orgnameSanta casa de São Paulo orgdiv1Faculdade de Ciências Médicas
                Article
                S0034-72992009000200008 S0034-7299(09)07500208
                438d3732-ec1e-4af4-a306-cf86f807cbb7

                This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

                History
                : 01 February 2008
                : 05 November 2007
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 30, Pages: 8
                Product

                SciELO Brazil

                Categories
                Artigos Originais

                nariz,biocompatibility,coelhos,celulose,biocompatibilidade,nose,rabbits,cellulose

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