Heterologous mesenchymal stem cells successfully treat femoral pseudarthrosis in rats

<p>Abstract</p> <p>Background</p> <p>This study evaluated the effectiveness of treating pseudarthrosis in rats by using bone marrow cell suspensions or cultures of bone marrow mesenchymal stromal cells</p> <p>Methods</p> <p>Thirty-eight specific pathogen-free (SPF) animals were randomly assigned to four groups: Group 1, Control, without surgical intervention; Group 2 (Placebo), experimental model of femoral pseudarthrosis treated only with saline solution; Group 3, experimental model of femoral pseudarthrosis treated with heterologous bone marrow cells suspension; Group 4, experimental model of femoral pseudarthrosis treated with cultures of heterologous mesenchymal stromal cells from bone marrow. When pseudarthrosis was confirmed by simple radiological studies, digital radiography and histopathology after a 120-day postoperative period, Groups 2, 3 and 4 were treated as above. At 30, 60 and 90 days after the treatment, all animals were evaluated by simple radiological studies, and at the end of the experiment, the animals were assessed by computed axial tomography and anatomopathological and histomorphometric examinations.</p> <p>Results</p> <p>Injected cells were detected in the areas affected by pseudarthrosis using scintigraphy within the first 24 hours after their administration. After 60 days, the animals of Group 3 showed callus formation while the animals of Group 4 presented periosteal reaction and had some consolidated areas. In contrast, Group 2 showed a predominance of fibro-osteoid tissue. After 90 days, bone consolidation and remodeling was observed in all animals from Group 3 whereas animals from Group 4 exhibited partial consolidation and those ones from Group 2 persisted with pseudarthrosis.</p> <p>Conclusion</p> <p>The treatment with heterologous bone marrow cells suspension proved to be effective in the treatment of pseudarthrosis whereas cultures of heterologous bone marrow mesenchymal stromal cells did not show the same potential to aid bone healing.</p

Expanded polytetrafluoroethylene in canine bile duct injury: a critical analysis Politetrafluoroetileno expandido na lesão do ducto biliar em cães: uma análise crítica

PURPOSE: Analyze the morphological and structural outcomes of a patch of expanded polytetrafluoroethylene in the treatment of an iatrogenic injury of the common bile duct. METHODS: In Group 1 (Sham), 7 dogs underwent 3 laparotomies with intervals of 30 days between them. In Group 2, 10 dogs underwent transient common bile duct obstruction. After 30 days, this biliary occlusion was undone and a patch of expanded polytetrafluoroethylene replaced a fragment removed from the duct's wall. Thirty days after this last surgery, cholangiographic assessment of prosthesis patency and macro and microscopic evaluation of the biliary tract were performed. Daily clinical inspection completed the study outcomes. The Wilcoxon non-parametric test was used for statistical analysis. RESULTS: In all dogs enlargement of the biliary tree diameter was observed 30 and 60 days after the first surgical procedure. Partial adhesion of the patch to the common bile duct as a free luminal foreign body was found in 6 dogs. The prosthesis was completely integrated to surrounding tissue in the remaining four. CONCLUSION: Although a feasible option for the treatment of biliary duct iatrogenic lesions, the expanded polytetrafluoroethylene prosthesis must be used with caution considering the potential risks for complications.<br>OBJETIVO: Analisar, evolutivamente, a morfologia e a estrutura de um fragmento de politetrafluoretileno expandido utilizado no tratamento de uma lesão iatrogênica do ducto biliar comum. MÉTODOS: No grupo 1 (Simulação), sete cães foram submetidos a três laparotomias com intervalos de 30 dias entre elas. No grupo 2, em dez cães realizou-se uma obstrução tansitória do ducto biliar comum. Após 30 dias, a oclusão biliar foi desfeita e um fragmento da parede ductal foi substituído por um retalho de politetrafluoretileno expandido. Trinta dias após esta última operação, foram efetuadas uma avaliação colangiográfica da perviedade da prótese e uma análise macro e microscópica do trato biliar. Inspeções clínicas diárias completaram o estudo evolutivo. O teste não paramétrico de Wilcoxon foi utilizado para análises estatísticas. RESULTADOS: Decorridos 30 e 60 dias do primeiro procedimento cirúrgico, observou-se, em todos os cães, aumento do diâmetro da árvore biliar. Em seis cães verificou-se a presença do fragmento da prótese parcialmente aderido à parede do ducto biliar comum e também solta no lúmen da via biliar. A prótese estava completamente integrada aos tecidos circunvizinho nos demais quarto animais. CONCLUSÃO: A prótese de politetrafluoretileno expandido apresenta-se como uma opção factível para o tratamento das lesões iatrogênicas do ducto biliar, entretanto, deve ser utilizada com cautela, considerando o risco potencial de complicações