Población de proteoglicanos en diferentes sitios anatómicos de la cartílaga articular de la rodilla bovina
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https://doi.org/10.24933/rep.v7i1.301Palabras clave:
Forças biomecânicas, glicosaminoglicanos, variação anatômicaResumen
Las fuerzas mecánicas que actúan sobre una articulación sinovial inducen cambios en la composición y organización del cartílago articular. Los condrocitos responden a los estímulos tanto de manera cuantitativa como cualitativa en relación a la matriz extracelular. En el presente estudio, se investigaron cinco regiones diferentes de la articulación de rodilla bovina en términos de poblaciones de proteoglicanos y su contenido de glucosaminoglicano. La población de PG de alta densidad fue aislada por ultracentrifugación (fracción D1) y filtración en gel. El PG presentó tamaño similar en todas las regiones, pero en la tibia estas moléculas presentan mayor Mr. El sulfato de condroitina fue el glucosaminoglicano más prominente detectado en la fracción D1 y sus cadenas presentaron alrededor de 40 KDa. Dos poblaciones de PG no agregantes se aislaron en cantidades similares de todas las regiones. Estas moléculas mostraron características polidispersas y migrando alrededor de 70 y 200 kDa y mostrando un comportamiento similar al de los pequeños proteoglicanos decorin y biglican. La presencia de decorin fue confirmada por immunoblotting. El análisis del gel de agarosa después de la digestión con papaína mostró la presencia de dermatan sulfato en estos PGs. La presencia de decorin y en particular de biglicano en la fracción D2 sugiere que estos pequeños proteoglicanos pueden interactuar fuertemente con proteoglucanos no agregantes de alto peso molecular. El inmunoblotting para la fibromodulina fue positivo para estas moléculas. No se observaron diferencias en cuanto a los aspectos cuantitativos, pero el tratamiento con anti-fibromodulina también fue positivo para moléculas con 150 kDa. Estas moléculas desaparecen cuando la muestra es tratada con agentes reductores. Este fenómeno puede estar relacionado con la autoagregación. La presencia de FM agregado de 150 kDa fue más prominente en el cartílago articular de la tibia. Estos resultados indican el efecto de la estimulación mecánica en las diferentes regiones de una misma articulación. Al considerar la relación existente entre la composición de la matriz y los estímulos mecánicos o químicos, se debe tener en cuenta que los condrocitos son sensibles a diferentes estímulo y pueden presentar un comportamiento metabólico heterogéneo en diferentes regiones de una misma articulación.
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