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La integridad citoesquelética mediada por HSF-1 determina la termotolerancia y la esperanza de vida

Nathan A Baird¹, Peter M Douglas¹, Milos S Simic¹

¹Howard Hughes Medical Institute, University of California Berkeley, Berkeley, CA 94720, USA.

Science (New York, N.Y.)

|October 18, 2014

Resumen

El factor de transcripción de choque térmico-1 (HSF-1) regula la resistencia al estrés celular y la longevidad. Una cepa HSF-1 modificada impacta el citoesqueleto de actina a través de PAT-10, mejorando la resistencia al estrés y la vida útil sin aumentar las chaperonas.

Área de la Ciencia:

Biología celular Biología celular.
Genética La genética.
Investigación sobre el envejecimiento de la investigación.

Sus antecedentes:

El factor de transcripción de choque térmico-1 (HSF-1) es crucial para la resistencia al estrés celular y la longevidad.
HSF-1 normalmente controla los genes de las chaperonas moleculares, protegiendo a las proteínas del estrés y el envejecimiento.
Los mecanismos exactos por los cuales HSF-1 influye en la longevidad más allá de la regulación de la chaperona no se comprenden completamente.

Objetivo del estudio:

Investigar un nuevo mecanismo de HSF-1 en la regulación de la resistencia al estrés y la longevidad.
Explorar el papel de HSF-1 en el mantenimiento de la integridad celular independiente de la inducción de la chaperona.
Para identificar objetivos posteriores de HSF-1 involucrados en la garantía de salud.

Principales métodos:

Ingeniería de una cepa modificada del factor de transcripción de choque térmico-1 (HSF-1) en Caenorhabditis elegans.
Analizar la expresión génica y la función de las proteínas relacionadas con la respuesta al estrés y la integridad del citoesqueleto.
Análisis fenotípico de la resistencia al estrés, la tolerancia a la temperatura y la vida útil.

Principales resultados:

Una cepa modificada de HSF-1 exhibió una mayor resistencia al estrés y longevidad sin niveles elevados de acompañante.
Este efecto fue mediado por la proteína de unión al calcio PAT-10.
La pérdida de pat-10 dio lugar al colapso del citoesqueleto de actina, redujo la resistencia al estrés y redujo la vida útil.
La sobreexpresión de pat-10 mejora la estabilidad del filamento de actina, la termotolerancia y la longevidad.

Conclusiones:

HSF-1 juega un papel importante en el mantenimiento de la integridad del citoesqueleto, particularmente el citoesqueleto de actina.
La vía HSF-1-PAT-10 es crítica para la función celular durante el estrés y el envejecimiento.
La influencia de HSF-1 en la longevidad se extiende más allá de la regulación de la chaperona, que implica la estabilidad del citoesqueleto.

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