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Inactivación de Atg5/autofagia en el microambiente óseo de ratón promueve el desarrollo tumoral

Marie-Charlotte Trojani^1,2, Marie Nollet¹, Olivier Camuzard^1,3

¹UMR4320 PHEN-X, CEA/DRF/Institut Joliot, Faculté de Médecine Nice, Université Côte d'Azur, France.

|January 30, 2026

Resumen

La deficiencia del gen de autofagia ATG5 en las células óseas promueve el crecimiento del osteosarcoma y la metástasis. Dirigirse a la autofagia en el hueso puede ofrecer una estrategia para retrasar la propagación del cáncer de hueso y mejorar la supervivencia del paciente.

Área de la Ciencia:

Oncología
Biología Celular
Biología Molecular

Sus antecedentes:

El hueso es un sitio común para la metástasis del cáncer, lo que empeora significativamente el pronóstico del paciente.
Comprender los mecanismos moleculares que impulsan el desarrollo de tumores óseos es fundamental para mejorar las tasas de supervivencia.

Objetivo del estudio:

Investigar el papel de la macroautofagia/gen de autofagia ATG5 en los osteoblastos en la metástasis ósea.
Identificar cómo la deficiencia de ATG5 afecta el microambiente óseo y la progresión tumoral.

Principales métodos:

Inactivación del gen ATG5 en osteoblastos en un modelo preclínico.
Análisis del crecimiento tumoral, diseminación metastásica, inflamación sistémica y proteoma óseo.
Se investigaron los efectos independientes de la autofagia de la inactivación de ATG5.

Principales resultados:

La inactivación de ATG5 en los osteoblastos estimuló significativamente el crecimiento del osteosarcoma y la metástasis ósea.
La deficiencia de ATG5 indujo inflamación sistémica, alteró el proteoma óseo y promovió la beta-oxidación de ácidos grasos.
La inactivación de ATG5 desencadenó la exocitosis lisosomal a través de una vía independiente de la autofagia.

Conclusiones:

La deficiencia de autofagia/ATG5 en el microambiente óseo crea un entorno pro-tumoral.
La focalización de la autofagia en el hueso podría ser una estrategia terapéutica para inhibir la metástasis ósea.
Los inductores de autofagia dirigidos al hueso pueden retrasar la aparición de metástasis óseas.

Palabras clave:

Autofagia metástasis ósea microambiente óseo cáncer de mama osteoblasto osteosarcoma

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