Evaluation of chitosan-GP hydrogel biocompatibility in osteochondral defects: an experimental approach

Evaluation of chitosan-GP hydrogel biocompatibility in osteochondral defects: an experimental approach

Autor Martins, Edivaldo A. N. Google Scholar
Michelacci, Yara M. Autor UNIFESP Google Scholar
Baccarin, Raquel Y. A. Google Scholar
Cogliati, Bruno Google Scholar
Silva, Luis C. L. C. Google Scholar
Instituição Universidade de São Paulo (USP)
Universidade Federal de São Paulo (UNIFESP)
Resumo Background: Articular cartilage, because of its avascular nature, has little capacity for spontaneous healing, and tissue engineering approaches, employing different biomaterials and cells, are under development. Among the investigated biomaterials are the chitosan-based hydrogels. Although thoroughly studied in other mammalian species, studies are scarce in equines. So, the aim of the present study was to investigate the biocompatibility of chitosan-GP in horse joints submitted to high mechanical loads.Results: An osteochondral defect was created by arthroscopy in the medial surface of lateral trochlea of talus of left or right leg, randomly selected, from six healthy geldings. the defect was filled up with chitosan-GP. the contralateral joint received an identical defect with no implant. the chondral fragment removed to produce the defect was collected, processed and used as the Initial sample (normal cartilage) for histology, immunohistochemistry, and metabolic labelling of PGs. After 180 days, the repair tissues were collected, and also analyzed. At the end of the experiment (180 days after lesion), the total number of cells per field in repair tissues was equal to control, and macrophages and polymorphonuclear cells were not detected, suggesting that no significant inflammation was present. These cells were able to synthesize type II collagen and proteoglycans (PGs). Nevertheless, the cell population in these tissues, both in presence of chitosan-GP and in untreated controls, were heterogeneous, with a lower proportion of type II collagen-positives cells and some with a fibroblastic aspect. Moreover, the PGs synthesized in repair tissues formed in presence or absence of chitosan-GP were similar to those of normal cartilage. However, the chitosan-GP treated tissue had an disorganized appearance, and blood vessels were present.Conclusions: Implanted chitosan-GP did not evoke an important inflammatory reaction, and permitted cell growth. These cells were able to synthesize type II collagen and PGs similar to those synthesized in normal cartilage and in healing tissue without implant, indicating its chondrocyte nature.
Assunto Chitosan-GP
Cartilage
Proteoglycan
Type II collagen
Equine joint
Biocompatibility
Scaffold
Idioma Inglês
Financiador Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
Data 2014-08-27
Publicado em Bmc Veterinary Research. London: Biomed Central Ltd, v. 10, 9 p., 2014.
ISSN 1746-6148 (Sherpa/Romeo, fator de impacto)
Editor Biomed Central Ltd
Extensão 9
Fonte http://dx.doi.org/10.1186/s12917-014-0197-4
Direito de acesso Acesso aberto Open Access
Tipo Artigo
Web of Science WOS:000341852000001
URI http://repositorio.unifesp.br/handle/11600/38106

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