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La fosforilación de la plakoglobina en la serina 665 es capaz de estabilizar la adhesión mediada por la cadherina en
Franziska Vielmuth1, Anna M Sigmund1, Desalegn T Egu1
1Chair of Vegetative Anatomy, Institute of Anatomy, Faculty of Medicine, LMU Munich, Munich, Germany.
JCI insight
|February 9, 2026
Resumen
La fosforilación de la plakoglobina (PG) en la serina 665 es vital para estabilizar la cohesión celular de la piel en el pénfigo. Este hallazgo explica cómo apremilast protege contra la formación de ampollas al mejorar la adhesión celular y el anclaje de la queratina.
Área de la Ciencia:
- Dermatología Dermatología dermatología.
- Biología celular Biología celular.
- La bioquímica es la bioquímica.
Sus antecedentes:
- El pemfigo es una enfermedad autoinmune con ampollas causada por autoanticuerpos dirigidos a las desmogleínas (DSG1/DSG3).
- El aumento de los niveles intracelulares de AMP cíclico (cAMP) con apremilast estabiliza la cohesión de los queratinocitos en modelos de pénfigo.
- Esta estabilización se correlaciona con la fosforilación de la plakoglobina (PG) en la serina 665 (S665).
Objetivo del estudio:
- Investigar la importancia funcional de la fosforilación de PG en S665 en el mantenimiento de la cohesión de los queratinocitos.
- Para dilucidar los mecanismos moleculares por los cuales la fosforilación de PG-S665 contribuye a la adhesión celular y la integridad del citoesqueleto.
- Evaluar el papel de la fosforilación de PG-S665 en los efectos terapéuticos del apremilasto en el pénfigo.
Principales métodos:
- Utilizó un modelo de ratón con deficiencia de fósforo PG-S665 (PG-S665A) para análisis ultrastructural y funcional.
- Se evaluó la organización del citoesqueleto de queratina y la fuerza de unión de la desmogleína 3 (DSG3) en queratinocitos de tipo salvaje y PG-S665A.
- Examinó los efectos del aumento de la cAMP en la inserción de queratina y el ensamblaje del desmosoma en la piel humana ex vivo.
Principales resultados:
- Los ratones PG-S665A exhibieron una disminución de la inserción de queratina y una eficacia reducida del apremilasto en la prevención de la formación de ampollas en la piel.
- Apremilast no pudo restaurar las alteraciones del citoesqueleto de la queratina en ratones PG-S665A.
- La fosforilación de PG-S665 fue esencial para la unión de DSG3, el anclaje del filamento de queratina a los desmosomas y la estabilización de la cohesión de los queratinocitos mediada por cAMP.
Conclusiones:
- La fosforilación de PG en S665 es crítica para los efectos protectores del apremilasto en el pénfigo.
- La fosforilación de PG-S665 juega un papel clave en el mantenimiento de la integridad desmosomal mediante el anclaje de filamentos de queratina y el aseguramiento de la unión DSG3.
- Dirigirse a la fosforilación de PG-S665 representa una estrategia terapéutica potencial para el pénfigo y los trastornos de ampollas relacionados.
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