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Una vía de ubiquitinación conservada determina la longevidad en respuesta a la restricción de la dieta
Andrea C Carrano1, Zheng Liu, Andrew Dillin
1Molecular and Cell Biology Laboratory, The Salk Institute for Biological Studies, La Jolla, California 92037, USA.
Nature
|June 26, 2009
Resumen
La restricción dietética extiende la vida útil a través de la HECT E3 ubiquitina ligasa WWP-1 y la enzima UBC-18 en C. elegans. El WWP-1 es el WWP-1.
Área de la Ciencia:
- Biología celular Biología celular.
- Genética La genética.
- Investigación sobre el envejecimiento Investigación sobre el envejecimiento.
Sus antecedentes:
- La restricción dietética (RD) es una intervención conservadora que extiende la vida útil en diversas especies.
- Esto sugiere mecanismos conservados subyacentes que involucran la detección de nutrientes y las vías de prosurvivencia.
- Comprender estas vías es crucial para desarrollar estrategias para promover un envejecimiento saludable.
Objetivo del estudio:
- Para investigar el papel de la HECT E3 ubiquitin ligasa WWP-1 en la regulación de la esperanza de vida en respuesta a la restricción dietética.
- Para identificar los factores aguas abajo y los requisitos enzimáticos para la longevidad mediada por WWP-1.
- Para aclarar la contribución específica de WWP-1 a la extensión de la vida útil inducida por DR.
Principales métodos:
- Utilizó el organismo modelo Caenorhabditis elegans.
- Manipuló la expresión de wwp-1 (mutante tipo salvaje y catalizador muerto) y ubc-18.
- Esperanza de vida estimada bajo condiciones de alimentación ad libitum y restricción dietética.
- Se han investigado dependencias genéticas que incluyen pha-4 y daf-16.
Principales resultados:
- La sobreexpresión de wwp-1 prolongó la vida útil hasta en un 20% en C. elegans.
- El efecto promotor de la longevidad de WWP-1 dependía del factor de transcripción FOXA pha-4, pero no del DAF-16.
- La pérdida de la función wwp-1 suprimía la longevidad inducida por DR, mientras que su actividad catalítica era esencial.
- Se descubrió que la enzima de conjugación de la ubiquitina E2 UBC-18 era esencial y específica para la longevidad inducida por DR, interactuando con WWP-1.
Conclusiones:
- WWP-1 actúa como un regulador positivo de la esperanza de vida en respuesta a la restricción dietética en C. elegans.
- La actividad de la ubiquitina ligasa de WWP-1, en conjunto con UBC-18, es crítica para la longevidad mediada por DR.
- Estos hallazgos revelan una nueva vía de ubiquitina ligasa que involucra a WWP-1 y UBC-18 que regula la vida útil en condiciones limitadas de nutrientes.
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