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Los condrocitos desdiferenciados reexpresan el fenotipo de colágeno diferenciado cuando se cultivan en geles de

P D Benya, J D Shaffer

|August 1, 1982

Resumen

Los condrocitos articulares de conejo se desdiferencian en el cultivo monocapa, pero recuperan su fenotipo especializado en el cultivo en suspensión. La forma de la célula es clave para mantener la expresión génica de los condrocitos y la producción de la matriz.

Área de la Ciencia:

Biología celular Biología celular.
La bioquímica es la bioquímica.
La ingeniería de tejidos es la ingeniería de tejidos.

Sus antecedentes:

Los condrocitos articulares exhiben un fenotipo diferenciado caracterizado por la síntesis de colágeno y proteoglicanos tipo II.
El cultivo en monocapa en serie conduce a la desdiferenciación, con una pérdida de este fenotipo y un cambio hacia la producción de colágeno tipo I.

Objetivo del estudio:

Para investigar la reversibilidad de la desdiferenciación de los condrocitos.
Determinar el papel de la forma celular en el mantenimiento del fenotipo y la expresión génica de los condrocitos.

Principales métodos:

Cultivo monocapa en serie de condrocitos articulares de conejo.
Cultivo de suspensión en geles de agarosa para inducir una morfología celular esférica e independiente del anclaje.
Análisis de la síntesis de colágeno y proteoglicanos.
Electroforesis en gel de SDS-poliacrilamida y mapeo de péptidos de bromuro de cianógeno de las cadenas de colágeno.

Principales resultados:

Los condrocitos desdiferenciados recuperaron su fenotipo diferenciado, incluida la síntesis de colágeno y proteoglicanos de tipo II, en cultivo en suspensión.
Aproximadamente el 80% de los condrocitos sobrevivieron a la transición al cultivo en suspensión.
La morfología celular cambió de aplanada a esférica, en correlación con la restauración del fenotipo.
Los análisis bioquímicos y moleculares confirmaron un retorno completo al fenotipo de colágeno diferenciado.

Conclusiones:

El fenotipo de los condrocitos está modulado significativamente por la forma celular y las interacciones entre la célula y la matriz celular.
El cultivo en suspensión en agarosa proporciona un sistema reversible para el estudio de la expresión génica y la desdiferenciación de los condrocitos.
Este sistema modelo es valioso para comprender la biología del cartílago y desarrollar estrategias regenerativas.

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