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      Wound healing after radiation therapy: Review of the literature

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          Abstract

          Radiation therapy is an established modality in the treatment of head and neck cancer patients. Compromised wound healing in irradiated tissues is a common and challenging clinical problem. The pathophysiology and underlying cellular mechanisms including the complex interaction of cytokines and growth factors are still not understood completely. In this review, the current state of research regarding the pathomechanisms of compromised wound healing in irradiated tissues is presented. Current and possible future treatment strategies are critically reviewed.

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          Most cited references70

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          Hyperbaric oxygen: its mechanisms and efficacy.

          This article outlines therapeutic mechanisms of hyperbaric oxygen therapy and reviews data on its efficacy for clinical problems seen by plastic and reconstructive surgeons. The information in this review was obtained from the peer-reviewed medical literature. Principal mechanisms of hyperbaric oxygen are based on intracellular generation of reactive species of oxygen and nitrogen. Reactive species are recognized to play a central role in cell signal transduction cascades, and the discussion will focus on these pathways. Systematic reviews and randomized clinical trials support clinical use of hyperbaric oxygen for refractory diabetic wound-healing and radiation injuries; treatment of compromised flaps and grafts and ischemia-reperfusion disorders is supported by animal studies and a small number of clinical trials, but further studies are warranted. Clinical and mechanistic data support use of hyperbaric oxygen for a variety of disorders. Further work is needed to clarify clinical utility for some disorders and to hone patient selection criteria to improve cost efficacy.
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            The wound-healing and antioxidant effects of adipose-derived stem cells.

            The aim of tissue engineering is to repair and regenerate damaged organs using a combination of cells, biomaterials and growth factors. Mesenchymal stem cells within the stromal-vascular fraction of subcutaneous adipose tissue, that is adipose-derived stem cells (ADSCs) have been used in skin repair with satisfactory results. The production and secretion of growth factors has been reported to be an essential function of ADSCs, and diverse regenerative effects of ADSCs in the skin have been demonstrated. Recent research developments concerning the wound-healing and antioxidant effects of ADSCs are briefly described. Various experimental results regarding the wound-healing and antioxidant effect of ADSCs are introduced, and the mechanisms and identification of active proteins involved in these function are further discussed. Evidence of ADSC differentiation of skin has not been reported in vivo, but ADSCs accelerate wound-healing and exhibit antioxidant effects under various conditions. The wound-healing and antioxidant effects of ADSCs are mainly mediated by the activation of dermal fibroblasts and keratinocytes via the paracrine mechanism. Since ADSCs are easily obtained in large quantities and have an advantage over other stem cell sources, ADSCs and their secretory factors show promise for use in skin repair and regeneration.
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              Antiwrinkle effect of adipose-derived stem cell: activation of dermal fibroblast by secretory factors.

              Adipose-derived stem cells (ADSC) have wound-healing and antioxidant effects on human skin via secretion of growth factors and activation of dermal fibroblasts. Paracrine mechanism reducing ultraviolet-B (UVB)-induced wrinkles by ADSC is investigated in this study. Wrinkles were induced by an eight-week UVB irradiation, and were significantly improved by the subcutaneous injection of ADSC in hairless mice. In a replica analysis, parameters involving wrinkles were improved with mid-level and high doses of ADSC (1x10(4) and 1x10(5) cells). Dermal thickness and collagen contents in the dermis also were increased in the ADSC-injected groups. To characterize the paracrine mechanism involving the antiwrinkle effect of ADSC, a conditioned medium of ADSC (ADSC-CM) was directly incubated in human dermal fibroblasts (HDF). UVB irradiation reduced the proliferation of HDF, but this was reversed by the pretreatment of ADSC-CM in a dose-dependent manner. In a cell cycle analysis, ADSC-CM decreased the UVB-induced apoptotic cell death, which was demonstrated by the reduced sub-G1 phase of HDF. In addition, the ADSC-CM increased the protein expression of collagen type I and decreased the protein level of matrix metalloproteinase 1 in HDF, which may account for the increased collagen contents in the dermis. Collectively, these results indicate that the ADSC and its secretory factors are effective for UVB-induced wrinkles, and the antiwrinkle effect is mainly mediated by reducing UVB-induced apoptosis and stimulating collagen synthesis of HDF.
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                Author and article information

                Journal
                Radiat Oncol
                Radiat Oncol
                Radiation Oncology (London, England)
                BioMed Central
                1748-717X
                2012
                24 September 2012
                : 7
                : 162
                Affiliations
                [1 ]Department of Otorhinolaryngology, Division of Facial Plastic Surgery, University of Regensburg, Regensburg, Germany
                [2 ]Department of Radiotherapy, University of Regensburg, Regensburg, Germany
                Article
                1748-717X-7-162
                10.1186/1748-717X-7-162
                3504517
                23006548
                e944f1a1-d40d-4d7a-8d0f-549f049afa65
                Copyright ©2012 Haubner et al.; licensee BioMed Central Ltd.

                This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

                History
                : 18 June 2012
                : 20 September 2012
                Categories
                Review

                Oncology & Radiotherapy
                wound healing,radiation therapy
                Oncology & Radiotherapy
                wound healing, radiation therapy

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