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Nicholas S. Greaves MBChB Brian Benatar FRCpath Mohamed Baguneid MD Ardeshir Bayat MBBS PhD 《Wound repair and regeneration》2013,21(6):813-822
We present results of an original clinical study investigating efficacy of a decellularized dermal skin substitute (DCD) as part of a one‐stage therapeutic strategy for recalcitrant leg ulcers. Twenty patients with treatment‐resistant ulcers underwent hydrosurgical debridement, after which DCD was applied and covered with negative pressure dressings for 1 week. Participants were reviewed on seven occasions over 6 months. 3D photography, full‐field laser perfusion imaging, spectrophotometric intracutaneous analysis, and sequential biopsies were used to monitor healing. Mean ulcer duration and surface area prior to DCD placement were 4.76 years (range 0.25–40 years) and 13.11 cm2 (range 1.06–40.75 cm2), respectively. Seventy percent of ulcers were venous. Surface area decreased in all patients after treatment (range 23–100%). Mean reduction was 87% after 6 months, and 60% of patients healed completely. Wound bed hemoglobin flux increased significantly 6 weeks after treatment (p = 0.005). Histological and immunohistochemical analysis confirmed progressive DCD integration with colonization by host fibroblasts, lymphocytes, and neutrophils, resulting in fibroplasia, reepithelialisation, and angiogenesis, with correlating raised CD31, collagen I, and collagen III levels. Subgroup analysis showed differing cellular behavior depending on wound duration, with delayed angiogenesis, reduced collagen deposition, and smaller reductions in surface area in ulcers present for over 1 year. The stain intensities of immunohistochemical markers including fibronectin, collagen, and CD31 differed depending on depth from the wound surface and presence of intact epithelium. DCD safely produced significant improvement in treatment‐resistant leg ulcers. With no requirement for hospital admission, anesthetic, or autogenic skin grafting, this treatment could be administered in hospital and community settings. 相似文献
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Farzane Hendudari Abbas Piryaei Seyedeh-Nafiseh Hassani Hasan Darbandi Mohammad Bayat 《Lasers in medical science》2016,31(4):749-757
Low-level laser therapy (LLLT) exhibited biostimulatory effects on fibroblasts viability. Secretomes can be administered to culture mediums by using bone marrow mesenchymal stem cells conditioned medium (BM-MSCs CM). This study investigated the combined effects of LLLT and human bone marrow mesenchymal stem cell conditioned medium (hBM-MSCs CM) on the cellular viability of human dermal fibroblasts (HDFs), which was cultured in a high-glucose (HG) concentration medium. The HDFs were cultured either in a concentration of physiologic (normal) glucose (NG; 5.5 mM/l) or in HG media (15 mM/l) for 4 days. LLLT was performed with a continuous-wave helium-neon laser (632.8 nm, power density of 0.00185 W/cm2 and energy densities of 0.5, 1, and 2 J/cm2). About 10 % of hBM-MSCs CM was added to the HG HDF culture medium. The viability of HDFs was evaluated using dimethylthiazol-diphenyltetrazolium bromide (MTT) assay. A significantly higher cell viability was observed when laser of either 0.5 or 1 J/cm2 was used to treat HG HDFs, compared to the control groups. The cellular viability of HG-treated HDFs was significantly lower compared to the LLLT?+?HG HDFs, hBM-MSCs CM-treated HG HDFs, and LLLT?+?hBM-MSCs CM-treated HG HDFs. In conclusion, hBM-MSCs CM or LLLT alone increased the survival of HG HDFs cells. However, the combination of hBM-MSCs CM and LLLT improved these results in comparison to the conditioned medium. 相似文献
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Utility of early influenza diagnosis through point‐of‐care testing in children presenting to an emergency department 下载免费PDF全文
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Priming with an adenovirus 35-circumsporozoite protein (CS) vaccine followed by RTS,S/AS01B boosting significantly improves immunogenicity to Plasmodium falciparum CS compared to that with either malaria vaccine alone 下载免费PDF全文
Stewart VA McGrath SM Dubois PM Pau MG Mettens P Shott J Cobb M Burge JR Larson D Ware LA Demoitie MA Weverling GJ Bayat B Custers JH Dubois MC Cohen J Goudsmit J Heppner DG 《Infection and immunity》2007,75(5):2283-2290
The RTS,S/AS02A protein-based vaccine consistently demonstrates significant protection against infection with Plasmodium falciparum malaria and also against clinical malaria and severe disease in children in areas of endemicity. Here we demonstrate with rhesus macaques that priming with a replication-defective human adenovirus serotype 35 (Ad35) vector encoding circumsporozoite protein (CS) (Ad35.CS), followed by boosting with RTS,S in an improved MPL- and QS21-based adjuvant formulation, AS01B, maintains antibody responses and dramatically increases levels of T cells producing gamma interferon and other Th1 cytokines in response to CS peptides. The increased T-cell responses induced by the combination of Ad35.CS and RTS,S/AS01B are sustained for at least 6 months postvaccination and may translate to improved and more durable protection against P. falciparum infection in humans. 相似文献
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Synthesis,evaluation, and molecular docking studies of aryl urea‐triazole‐based derivatives as anti‐urease agents 下载免费PDF全文
Setareh Moghimi Fereshteh Goli‐Garmroodi Maryam Allahyari‐Devin Hedieh Pilali Malihe Hassanzadeh Shabnam Mahernia Mohammad Mahdavi Loghman Firoozpour Massoud Amanlou Alireza Foroumadi 《Archiv der Pharmazie》2018,351(7)
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Elnaz Mohammad Alizadeh Majid Mahdavi Forough Jenani Fard Solmaz Chamani Fereshteh Farajdokht 《Toxicology mechanisms and methods》2018,28(8):622-629
Oxidative stress has a causative role in ischemic reperfusion-induced cell death. Evidence has shown that metformin is capable to reduce ischemic reperfusion injuries. The current study investigated the effect of metformin on ischemia/reperfusion-induced apoptosis in PC12 cells by evaluation of Bcl-2 family proteins expression. Cells were exposed to a time-dependent in vitro oxygen-glucose deprivation/reoxygenation (OGD/R) injury and then treated with metformin. The intracellular reactive oxygen species (ROS) levels were measured. Western blotting was used to examine the expression of anti- and pro-apoptotic proteins. Moreover, the number of apoptotic cell death was evaluated by TUNEL assay. Our results showed that metformin attenuated ROS generation, downregulated pro-apoptotic BAX expression, and upregulated expression of the Bcl-2 protein in the PC12 cells. Moreover, metformin reduced cell death under OGD/R condition which was confirmed by lower apoptotic cell death in the TUNEL assay. These findings suggest that neuroprotective effect of metformin on OGD/R-induced cell death is possibly mediated by inhibition of ROS-induced apoptosis pathway. 相似文献