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La síntesis y distribución de desmina y vimentina durante la miogénesis in vitro
Cell
|January 1, 1980
Resumen
Durante la miogénesis, los mioblastos de pollo sintetizan inicialmente vimentin, luego desmin después de la fusión. La síntesis de desmina aumenta significativamente, jugando un papel clave en la organización de las miofibrillas y el ensamblaje del disco Z.
Área de la Ciencia:
- Desarrollo muscular y síntesis de proteínas de filamento intermedio.
- Biología celular y molecular de la miogénesis.
Sus antecedentes:
- Los presuntos mioblastos de pollo sintetizan la vimentina como una proteína primaria intermedia del filamento.
- La síntesis de desmina se inicia específicamente en el inicio de la fusión celular durante la miogénesis.
Objetivo del estudio:
- Para investigar la síntesis diferencial y la regulación de vimentina y desmina durante la miogénesis de pollo.
- Aclarar el papel de los filamentos intermedios en la organización de las miofibrillas y el ensamblaje del disco Z.
Principales métodos:
- Análisis electroforético y autoradiográfico de la incorporación de 35S-metionina en proteínas recién sintetizadas.
- La tinción inmunofluorescente con el uso de antiseras específicas de desmina y vimentina.
- Técnicas de doble inmunofluorescencia para determinar la distribución de las proteínas en los miotubos.
Principales resultados:
- La tasa de síntesis de desmina aumenta significativamente (al menos 10 veces) después de la fusión en comparación con la vimentina.
- La desmina se sintetiza solo en células de fusión o multinucleadas, mientras que la vimentina se sintetiza en todo el cuerpo.
- Tanto la vimentina como la desmina se asocian con las líneas Z de las miofibrillas durante etapas posteriores de la miogénesis, lo que sugiere un papel en la organización lateral de las miofibrillas.
Conclusiones:
- La síntesis de desmina y vimentina no está regulada de manera coordinada durante la miogénesis.
- Los sistemas de filamentos intermedios de desmina y vimentina son cruciales para la organización lateral y el registro de las miofibrillas.
- El ensamblaje del disco Z se produce en al menos dos pasos distintos durante la miogénesis.
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