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La autofagia es el aclaramiento dependiente de los genes de las células apoptóticas durante el desarrollo embrionario
Xueping Qu1, Zhongju Zou, Qihua Sun
1Department of Internal Medicine, University of Texas Southwestern Medical Center, Dallas, TX 75390, USA.
Cell
|March 14, 2007
Resumen
La autofagia es crucial para limpiar las células moribundas durante el desarrollo embrionario. Ayuda a las células a señalar para el engulfment, evitando la acumulación de cadáveres celulares y asegurando la muerte celular programada adecuada.
Área de la Ciencia:
- Biología celular Biología celular.
- Biología del desarrollo Biología del desarrollo.
- Investigación de la autofagia Investigación de la autofagia.
Sus antecedentes:
- El papel de la autofagia en la muerte celular programada (PCD) en metazoos no se entiende completamente.
- La cavitación embrionaria es el proceso más temprano de PCD en el desarrollo de los mamíferos.
Objetivo del estudio:
- Investigar la función de la autofagia en la cavitación embrionaria y la muerte celular programada.
- Para determinar cómo la autofagia influye en el aclaramiento de las células moribundas durante el desarrollo de los mamíferos.
Principales métodos:
- Estudió el knockout del gen de la autofagia (atg5, beclin 1) en cuerpos embrionarios (EB).
- Se evaluó la muerte celular programada (PCD) y la depuración de cadáveres celulares.
- Se analizó la exposición a la fosfatidilserina y la secreción de lisofosfatidilcolina.
- Se midieron los niveles celulares de ATP y se probó el rescate de metilpiruvato.
- Examinó el envolvimiento apoptótico del cadáver en ratones con deficiencia de atg5.
Principales resultados:
- Los EB con deficiencia de autofagia exhiben una cavitación embrionaria fallida debido a cadáveres celulares persistentes.
- Las células moribundas en EBs con deficiencia de autofagia muestran una reducción de las señales de "cómeme" (fosfatidilserina) y "ven a buscarme" (lizofosfatidilcolina).
- Estos defectos se correlacionan con bajos niveles celulares de ATP y son reversibles con el metilpiruvato.
- Los ratones que carecen de atg5 muestran deterioro de la envoltura apoptótica del cadáver durante la embriogénesis.
Conclusiones:
- La autofagia es esencial para la eliminación efectiva de las células muertas durante la muerte celular programada.
- Es probable que la autofagia promueva la señalización de la engulfment a través de mecanismos dependientes de la energía.
- Este proceso es vital para el desarrollo embrionario normal y para prevenir la acumulación de cadáveres celulares.
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