Adipose tissue stromal vascular fraction in the treatment of full thickness burns in rats

ABSTRACT PURPOSE: To analyze the healing effects of stromal vascular fraction (SVF) application compared to wound dressing with 2% silver sulfadiazine in full thickness burn wounds in rats. METHODS: Animals were divided into two groups: 2% silver sulfadiazine group and SVF group. Both groups received occlusive bandages while the first one was treated with 2% silver sulfadiazine and the latter was treated with injections of SVF prepared from adipose tissue extracted from an animal donor. The animals were accompanied through 3, 7 and 30 days for evaluation of macroscopic, microscopic and morphometric aspects. RESULTS: On day three, a significant increase (p<0.05) of infiltration of polymorphonuclear, fibrin formation and fibroblasts migration in SVF group was observed. On the 7th day the mononuclear infiltrate, angiogenesis, collagen and fibroblasts were significantly increased in the SVF group (p<0.05). At 30 days significantly increased collagen deposition was observed in the SVF group (p<0.05) . CONCLUSION: Adipose tissue derived stromal vascular fraction injections promotes better wound repair than 2% silver sulfadiazine in the treatment of full thickness burn in rats during the evaluated experimental period.

Effects of Platelet-Rich Plasma, Adipose-Derived Stem Cells, and Stromal Vascular Fraction on the Survival of Human Transplanted Adipose Tissue

Traditional adipose tissue transplantation has unpredictable viability and poor absorption rates. Recent studies have reported that treatment with platelet-rich plasma (PRP), adipose-derived stem cells (ASCs), and stromal vascular fraction (SVF) are related to increased survival of grafted adipose tissue. This study was the first simultaneous comparison of graft survival in combination with PRP, ASCs, and SVF. Adipose tissues were mixed with each other, injected subcutaneously into the back of nude mice, and evaluated at 4, 8, and 12 weeks. Human adipocytes were grossly maintained in the ASCs and SVF mixtures. Survival of the adipose tissues with PRP was observed at 4 weeks and with SVF at 8 and 12 weeks. At 12 weeks, volume reduction in the ASCs and SVF mixtures were 36.9% and 32.1%, respectively, which were significantly different from that of the control group without adjuvant treatment, 51.0%. Neovascular structures were rarely observed in any of the groups. Our results suggest that the technique of adding ASCs or SVF to transplanted adipose tissue might be more effective than the conventional grafting method. An autologous adipose tissue graft in combination with ASCs or SVF may potentially contribute to stabilization of engraftment.

Cultivo de células estromales de rata. Influencia del suero fetal bovino / Stromal rat cell culture. Influence of fetal calf serum

Las células madre estromales humanas y de roedores cultivadas pueden ser inducidas a diferenciarse en neuronas, enfatizando su utilidad potencial en la terapia celular neurorrestaurativa. Los sistemas de cultivo para la expansión de estas células describen el uso de diferentes proporciones de suero fetal, lo que motivó a estudiar qué concentración de suero fetal bovino era capaz de garantizar un adecuado rendimiento celular. Las células de la médula ósea de rata se cultivaron en medio a-MEM suplementado con 10 y 20 por cientode suero fetal bovino y se subcultivaron hasta 3 veces. La viabilidad celular de los cultivos primarios y los subcultivos estuvo por encima del 98 por ciento en ambos experimentos. Los cultivos primarios demoraron 17,4 días en confluir y los subcultivos 7,7 días. La concentración de suero fetal al 20 por ciento no aumentó significativamente la velocidad de multiplicación celular; no obstante, se obtuvo un mayor número de células estromales. El sistema de expansión in vitro podría utilizarse en estudios futuros para la expansión de las células estromales humanas, lo que sienta mejores bases para su aplicación clínica

Cultured human and rodents stromal stem cells can be induced to differentiate into neurons, emphasizing its potential use in neurorestorative cell therapy. Cropping systems for the expansion of these cells describe the use of different ratios of fetal serum, which led to study what concentration of fetal calf serum was able to ensure an adequate cell yield. Cells from rat bone marrow were cultured in medium supplemented with a-MEM 10 and 20 percent fetal bovine serum and subcultured up to 3 times. Cell viability of primary cultures and subcultures was above 98 percent in both experiments. Primary cultures converge delayed in 17.4 days and 7.7 days subcultures. The concentration of 20 percent fetal calf serum did not significantly increase the speed of cell division, however, we obtained a greater number of stromal cells. The expansion in vitro system could be used in future studies for the expansion of human stromal cells, which feels better basis for clinical application

Influência da composição de carreador biodegradável na viabilidade do implante de células mesenquimais indiferenciadas do tecido adiposo humano / Influence of scaffold composition in the viability of implantation of human adipose derived undifferentiated mesenchymal cells

Células mesenquimais indiferenciadas humanas foram obtidas por digestão enzimática e centrifugação do produto de lipoaspiração, expandidas in vitro, e implantadas no tecido subcutâneo de camundongos atímicos. No grupo I, cada animal recebeu o implante de uma membrana de 0,25cm2 de ácido glicólico e carbonato de trimetileno semeada com 1 x 106 destas células .No grupo II, cada um recebeu a injeção de 0,2ml de gel de ácido hialurônico reticulado contendo o mesmo número destas células / Human undifferentiated mesenchymal cells were obtained by enzymatic digestion and centrifugation of the product of liposuction. These cells were expanded, in vitro, and implanted subcutaneously in athymic mice. In group I, each animal received the implant of a 0,25cm2 membrane of glycolic acid and trimethylene carbonate, seeded with 1 x 106 of these cells. In group II, each one received 0,2 ml of cross-linked hyaluronic acid gel containing the same amount of these cells...