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La RAP1A endotelial atenúa la capilarización sinusoidal y la fibrosis hepática mediante la inhibición de la
Guangwen Chen1, Weiming Dai2, Junjun Wang1
1Department of Gastroenterology, Shanghai General Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China.
Gut
|February 11, 2026
Resumen
La deficiencia de proteína 1A asociada a Ras (RAP1A) en las células endoteliales sinusoidales del hígado (LSEC) promueve la capilarización y la fibrosis hepática mediante la activación de la señalización Notch. RAP1A es esencial para la homeostasis de LSEC y un objetivo terapéutico potencial para la fibrosis hepática.
Área de la Ciencia:
- Hepatología Hepatología.
- Biología endotelial Biología endotelial.
- Mecanismos moleculares de la fibrosis
Sus antecedentes:
- La capilarización de las células endoteliales sinusoidales del hígado (LSEC) es un evento temprano en la fibrogénesis hepática, que promueve la activación de las células estelares hepáticas.
- La proteína 1A asociada a Ras (RAP1A) se ha implicado en la fibrosis hepática, pero se desconoce su papel específico en la capilarización LSEC.
Objetivo del estudio:
- Para investigar el papel de la GTPasa RAP1A en la capilarización del LSEC y el desarrollo de la fibrosis hepática.
- Para dilucidar los mecanismos moleculares por los cuales RAP1A influye en estos procesos.
Principales métodos:
- Modelos establecidos de fibrosis hepática utilizando tratamientos HFHCD, CDAHFD, CCl4 o DDC en ratones.
- Ratones Rap1a knockout (Rap1aΔEC) generados y específicos para el endotelio.
- Utilizó un activador RAP1 (8-pCPT-2'-O-Me-cAMP) para la intervención terapéutica.
- Se evaluó la capilarización LSEC, la fibrosis hepática y la inflamación.
Principales resultados:
- La expresión de RAP1A fue regulada a la baja en LSECs durante la fibrosis y la capilarización in vitro.
- La deficiencia de Rap1a endotelial aceleró la capilarización del LSEC y la fibrosis hepática, exacerbando la lesión inducida por CCl4/DDC.
- La pérdida de RAP1A promovió la degradación de RAF1, mejorando la activación de la señalización Notch.
- La activación farmacológica de RAP1A redujo la capilarización LSEC y la fibrosis hepática.
Conclusiones:
- La deficiencia de Rap1a endotelial agrava la capilarización LSEC y la fibrosis hepática a través de la activación de la señalización Notch a través de la degradación de RAF1.
- Rap1a es crucial para mantener la homeostasis LSEC.
- Rap1a representa un objetivo terapéutico prometedor para la fibrosis hepática.
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