Avaliação do uso de Selante de Fibrina derivado do veneno de serpente como arcabouço biológico de células tronco mesenquimais na regeneração óssea do fêmur de ratos

• Ano de defesa: 2015
• Autor(a) principal: Creste, Camila Fernanda Zorzella [UNESP]
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual Paulista (Unesp)
• Palavras-chave em Português: Regeneração óssea; Materiais biomédicos; Células-tronco; Adesivos em cirurgia; Adesivo tecidual de fibrina; Biomedical materials; Adhesives in surgery; Bone regeneration
• Link de acesso: http://hdl.handle.net/11449/126481; http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/27-07-2015/000841557.pdf

The need for bone reconstruction can emerges from skeletal disorders congenital malformations, infections, trauma and from surgical tumor resection in some cancer treatments. Biomatrials play a key role providing a three-dimensional structure for new bone formation. They can be used as vehicles for mesenchymal stem cell (MSCs) and also work as a synthetic microenvironment in terms of chemical composition, physical structure and biological function. The possibility to use a fibrin sealant whose polymerizing factor is derived from snake venom (SFDVS) shows advantages related to not using human blood which allows for better clothing time and sealant degradation control, fitting into surgical needs. The objective of this study was to evaluate the use of SFDVS, associated or not with MSCs on rat femur bone regeneration. A 5-mm critical size defect was established on rat femur that were treated either with SFDVS alone or SFDVS + MSCs. Animals were euthanized at 03, 21 and 42 days after surgery and femur were sent to radiographic, histological and scanning electron microscopy (SEM) analyses. Isolation, expansion and characterization of MSCs were appropriate and could be used in future investigations. MSCs were positive for CD90 and ICAM and negative for class II MHC, CD 34 and CD11b, confirming MSC phenotype. Radiograph analyses showed that in either SFDVS or SFDVS + MSCs group there was significant filling of injury site, after 42 days of observation, with bone tissue formation, radiographically similar to normal tissue. SEM demonstrated that SFDVS was fixed inside injury site 03 days after surgery. At the 21st day it was possible to observe presence of cancellous bone in both groups and at 42nd we observed expressive injury filling, although it was higher in SFDVS + MSCs. Histological analyses showed new bone formation in both groups. However, in SFDVS + MSC group occured immature bone formation, in contrast to higher injury site filling. We ...