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La acumulación de la proteína Sun1 de la envoltura nuclear interna es patógena en las laminopatías progresiva y

Chia-Yen Chen¹, Ya-Hui Chi, Rafidah Abdul Mutalif

¹National Institute of Allergy and Infectious Diseases, The National Institutes of Health, Bethesda, MD 20892, USA.

|May 1, 2012

Resumen

Las mutaciones en el gen LMNA causan laminopatías como la distrofia muscular y la progeria. La reducción de la acumulación de la proteína Sun1 en modelos de ratón y células de pacientes mejoró inesperadamente la salud y la longevidad, implicando a Sun1 en estas enfermedades.

Área de la Ciencia:

Biología celular Biología celular.
Genética La genética.
Biología Molecular Biología Molecular

Sus antecedentes:

Las mutaciones del gen LMNA humano conducen a laminopatías, incluida la distrofia muscular de Emery-Dreifuss (AD-EDMD) y la progeria de Hutchinson-Gilford (HGPS).
Los ratones mutantes Lmna null (Lmna(-/-))) y LmnaΔ9 sirven como modelos para AD-EDMD y HGPS, exhibiendo patologías graves y esperanza de vida reducida.
Los fibroblastos de ratones Lmna(-/-) y LmnaΔ9, similares a las células HGPS, muestran núcleos deformes característicos.

Objetivo del estudio:

Para investigar el papel de la proteína Sun1 en la patogénesis de los trastornos relacionados con LMNA.
Para determinar si dirigirse a la acumulación de Sun1 puede mejorar los fenotipos de la enfermedad en modelos de laminopatías.
Identificar los mecanismos patógenos comunes que subyacen a las diferentes enfermedades inducidas por mutaciones en el gen LMNA.

Principales métodos:

Generación y análisis de ratones mutantes Lmna(-/-) y LmnaΔ9 deficientes en la proteína de la membrana nuclear interna Sun1.1.
Evaluación de las patologías tisulares y la esperanza de vida en ratones genéticamente modificados.
Evaluación de la morfología nuclear y la senescencia celular en fibroblastos mutantes LMNA y células derivadas de pacientes HGPS con y sin reducción de SUN1.

Principales resultados:

Los ratones Lmna- o LmnaΔ9 que carecían de Sun1 mostraron una reducción significativa de las patologías tisulares y un aumento de la longevidad.
La reducción de la sobreacumulación de SUN1 en los fibroblastos mutantes LMNA y las células HGPS corrigió los defectos nucleares.
La senescencia celular también se mejoró en las células mutantes LMNA y HGPS tras la reducción de SUN1.

Conclusiones:

La acumulación de la proteína Sun1 se identifica como un factor patógeno común en los trastornos Lmna(-/-), LmnaΔ9 y HGPS.
Dirigirse a la acumulación de Sun1 presenta una estrategia terapéutica potencial para las laminopatías.
Estos hallazgos resaltan el papel crítico de Sun1 en la integridad de la envoltura nuclear y la progresión de la enfermedad en condiciones relacionadas con LMNA.

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