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Cambios tempranos en la distribución y organización de las proteínas de microfilamento durante la transformación
Cell
|April 1, 1981
Resumen
La infección por el virus del sarcoma de Rous causa "flores" tempranas de la superficie celular ricas en actina y proteínas asociadas, lo que indica una rápida reorganización del microfilamento durante la transformación.
Área de la Ciencia:
- Biología celular Biología celular.
- Virología Virología.
- Biología Molecular Biología Molecular
Sus antecedentes:
- La infección por el virus del sarcoma de Rous (VSR) induce cambios morfológicos significativos en las células huésped.
- El gen viral src juega un papel crítico en la mediación de estas alteraciones celulares asociadas a la transformación.
Objetivo del estudio:
- Para investigar los eventos celulares tempranos y las acumulaciones de proteínas durante la transformación celular inducida por el RSV.
- Para caracterizar la composición y el origen de los primeros cambios morfológicos, específicamente "flores".
Principales métodos:
- Utilizó experimentos de descenso de temperatura con mutantes RSV sensibles a la temperatura y con defecto de transformación en células embrionarias de pollo.
- Se analizó la morfología celular y se colorearon las proteínas citoesqueléticas, incluidas la actina, la alfa-actinina, la miosina y la tropomiosina.
- Se emplea la flolidina etiquetada con fluoresceína para detectar la actina filamentosa (F-actina).
Principales resultados:
- Se observó la aparición de "flores" en la superficie celular dorsal dentro de los 15 minutos posteriores al cambio de temperatura.
- Se identificaron acumulaciones significativas de actina, alfa-actinina, miosina y tropomiosina dentro de estas "flores".
- Se ha demostrado una tinción intensa con faloidina, lo que indica la presencia de F-actina en estas estructuras.
Conclusiones:
- Las primeras estructuras de "flor" representan una rápida reorganización de los microfilamentos.
- Estos hallazgos sugieren que la dinámica de los microfilamentos se encuentra entre los primeros eventos alterados durante la transformación celular inducida por el RSV.
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