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TXNIP promueve la ferroposis a través de la ferritinofagia mediada por NCOA4

Pandian Nagakannan¹, Md Imamul Islam², Shakila Sultana²

¹Department of Physiology and Pathophysiology, University of Manitoba, Health Sciences Centre, Winnipeg, Canada; Department of Immunology, St. Jude Children's Research Hospital, Memphis, TN, USA.

Biochimica et biophysica acta. Molecular cell research

|September 6, 2025

Resumen

La proteína inhibidora de tioredoxina (TXNIP) impulsa la ferroposis, una vía de muerte celular implicada en enfermedades. La inhibición de TXNIP puede ofrecer nuevas estrategias terapéuticas para las afecciones que involucran ferroptosis.

Área de la Ciencia:

Biología celular
La bioquímica
Patología

Sus antecedentes:

La ferroptosis es una muerte celular dependiente del hierro caracterizada por la peroxidación lipídica.
Esta vía de muerte celular está relacionada con varias enfermedades, incluido el cáncer y la neurodegeneración.
La exposición al glutamato puede inducir la ferroposis en las neuronas.

Objetivo del estudio:

Investigar los mecanismos de la ferroptosis inducida por el glutamato en las neuronas HT22.
Para determinar el papel de la proteína inhibidora de la tiorredoxina (TXNIP) en la ferroptosis.
Para explorar el potencial de TXNIP como objetivo terapéutico.

Principales métodos:

Manipulación genética de TXNIP (deleción y sobreexpresión) en las neuronas HT22, los fibroblastos embrionarios de ratón y las células Hela.
Tratamiento con agentes que inducen la ferroposis (erastin, RSL3, ML210).
Evaluación de la viabilidad celular, la función mitocondrial, los niveles de glutatión (GSH) y GPX4, y la ferritinofagia.

Principales resultados:

La deleción de TXNIP confirió resistencia a los agentes que inducen la ferroposis.
La sobreexpresión de TXNIP aumentó la susceptibilidad a la ferroptosis.
TXNIP medió la ferroposis promoviendo la degradación de la ferritina a través de la ferritinofagia mediada por NCOA4, aumentando el hierro labile y la peroxidación lipídica.
La deleción de TXNIP está protegida contra la disfunción mitocondrial independientemente de GSH y GPX4.

Conclusiones:

TXNIP es un regulador positivo clave de la ferroptosis.
TXNIP modula la ferroposis mediante el control de la disponibilidad de hierro a través de la ferritinofagia.
La orientación de TXNIP presenta una estrategia terapéutica potencial para las enfermedades relacionadas con la ferroposis.

Palabras clave:

La autofagia Erastín y sus derivados Glutamato y sus derivados El hierro Peroxidación de lípidos Los lisosomas Las mitocondrias En el caso de los vehículos

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