Your browser doesn't support javascript.
loading
Mostrar: 20 | 50 | 100
Resultados 1 - 1 de 1
Filtrar
Mais filtros










Base de dados
Intervalo de ano de publicação
1.
J Orthop Res ; 31(8): 1283-92, 2013 Aug.
Artigo em Inglês | MEDLINE | ID: mdl-23620164

RESUMO

Post-traumatic arthritis (PTA) frequently develops after intra-articular fracture of weight bearing joints. Loss of cartilage viability and post-injury inflammation have both been implicated as possible contributing factors to PTA progression. To further investigate chondrocyte response to impact and fracture, we developed a blunt impact model applying 70%, 80%, or 90% surface-to-surface compressive strain with or without induction of an articular fracture in a cartilage explant model. Following mechanical loading, chondrocyte viability, and apoptosis were assessed. Culture media were evaluated for the release of double-stranded DNA (dsDNA) and immunostimulatory activity via nuclear factor kappa B (NF-κB) activity in Toll-like receptor (TLR) -expressing Ramos-Blue reporter cells. High compressive strains, with or without articular fracture, resulted in significantly reduced chondrocyte viability. Blunt impact at 70% strain induced a loss in viability over time through a combination of apoptosis and necrosis, whereas blunt impact above 80% strain caused predominantly necrosis. In the fracture model, a high level of primarily necrotic chondrocyte death occurred along the fracture edges. At sites away from the fracture, viability was not significantly different than controls. Interestingly, both dsDNA release and NF-κB activity in Ramos-Blue cells increased with blunt impact, but was only significantly increased in the media from fractured cores. This study indicates that the mechanism of trauma determines the type of chondrocyte death and the potential for post-injury inflammation.


Assuntos
Biomarcadores/metabolismo , Cartilagem Articular/patologia , Condrócitos/patologia , Modelos Animais de Doenças , Fraturas de Cartilagem/patologia , Animais , Apoptose , Cartilagem Articular/lesões , Cartilagem Articular/metabolismo , Sobrevivência Celular , Células Cultivadas , Condrócitos/metabolismo , Meios de Cultivo Condicionados/química , DNA/análise , Feminino , Fraturas de Cartilagem/metabolismo , Inflamação , NF-kappa B/metabolismo , Necrose , Joelho de Quadrúpedes/citologia , Estresse Mecânico , Suínos , Receptores Toll-Like , Suporte de Carga
SELEÇÃO DE REFERÊNCIAS
DETALHE DA PESQUISA
...