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La represión transcripcional de PGC-1alfa por la huntingtina mutante conduce a la disfunción mitocondrial y la
Libin Cui1, Hyunkyung Jeong, Fran Borovecki
1Department of Neurology, Massachusetts General Hospital, Harvard Medical School, MassGeneral Institute for Neurodegeneration, Charlestown, MA 02129 USA.
Cell
|October 5, 2006
Resumen
La enfermedad de Huntington implica un deterioro de la función mitocondrial debido a la huntingtina mutante que inhibe el PGC-1alpha. La restauración de PGC-1alpha ofrece neuroprotección e invierte los efectos tóxicos en los modelos de la enfermedad de Huntington.
Área de la Ciencia:
- Las enfermedades neurodegenerativas son enfermedades neurodegenerativas.
- Biología mitocondrial Biología mitocondrial
- Regulación genética La regulación genética.
Sus antecedentes:
- La enfermedad de Huntington (HD) es un trastorno neurodegenerativo hereditario.
- La patogénesis implica la desregulación transcripcional y el metabolismo energético alterado.
- La proteína huntingtina mutante es el agente causal.
Objetivo del estudio:
- Para investigar el papel de PGC-1alpha en la patogénesis de la enfermedad de Huntington.
- Para determinar si el PGC-1alpha puede contrarrestar los efectos de la huntingtina mutante.
Principales métodos:
- Investigó el efecto de la huntingtina mutante en la transcripción del gen PGC-1alpha.
- Se utilizaron modelos de ratón PGC-1alpha knockout y HD knockin.
- Neuroprotección evaluada en neuronas estriatales cultivadas e in vivo mediante administración lentiviral.
Principales resultados:
- La huntingtina mutante inhibe la transcripción de PGC-1alfa al interferir con la vía CREB/TAF4.
- La deficiencia de PGC-1alfa exacerba la neurodegeneración y los déficits motores en ratones con EH.
- La expresión de PGC-1alpha invierte parcialmente la toxicidad de la huntingtina mutante in vitro y proporciona neuroprotección in vivo.
Conclusiones:
- PGC-1alpha juega un papel crítico en la regulación del metabolismo energético en la EH temprana.
- Dirigirse a PGC-1alpha representa una estrategia terapéutica potencial para la enfermedad de Huntington.
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