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Conocimientos estructurales sobre el transporte de hormonas tiroideas en el cerebro a través de MCT8 y OATP1C1

Yunhui Ge¹, Tongyi Dou², Thu Uyen Nguyen¹

¹Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX 77030, USA.

|July 18, 2025

Resumen

Los transportadores de hormonas tiroideas MCT8 y OATP1C1 son cruciales para el desarrollo del cerebro. Las nuevas estructuras cryo-EM revelan sus distintos mecanismos de transporte y cómo las mutaciones causan trastornos neurológicos como el síndrome de Allan-Herndon-Dudley.

Área de la Ciencia:

La neurociencia
Biología molecular
La bioquímica

Sus antecedentes:

Las hormonas tiroideas son esenciales para el desarrollo neurológico.
Los transportadores de soluto (SLC) MCT8 y OATP1C1 facilitan el transporte de la hormona tiroidea a través de la barrera hematoencefálica.
Las mutaciones en MCT8 causan el síndrome de Allan-Herndon-Dudley (AHDS), mientras que la deficiencia de OATP1C1 está relacionada con la neurodegeneración.

Objetivo del estudio:

Determinar las estructuras de MCT8 y OATP1C1 unidas a las hormonas tiroideas.
Para aclarar los distintos mecanismos de reconocimiento y transporte de la hormona tiroidea por MCT8 y OATP1C1.
Para explicar la base molecular de las mutaciones asociadas a la enfermedad.

Principales métodos:

Microscopía cryoelectrónica (cryo-EM) para obtener estructuras de alta resolución.
Estudios funcionales para analizar la actividad del transportador.
Análisis estructural para comprender la unión y el transporte de hormonas.

Principales resultados:

Determinación de las estructuras cryo-EM de MCT8 y OATP1C1 con triyodotironina (T3) y tiroxina (T4) a una resolución de 2,9 y 2,3 Å, respectivamente.
Mecanismos distintos para el reconocimiento y transporte de hormonas tiroideas por los dos transportadores.
Se identificó un sitio alostérico extracelular en OATP1C1, una característica nueva para los transportadores de SLC.
Proporcionó explicaciones estructurales para las mutaciones causantes de enfermedades.

Conclusiones:

El estudio revela los mecanismos moleculares subyacentes al transporte de la hormona tiroidea por MCT8 y OATP1C1.
Las ideas estructurales explican la fisiopatología de los trastornos neurológicos relacionados con la deficiencia de AHDS y OATP1C1.
Los hallazgos avanzan en nuestra comprensión de la homeostasis de la hormona tiroidea y su papel en el desarrollo y la enfermedad.

Palabras clave:

Las AHDS Síndrome de Allan-Herndon-Dudley El MCT8 OATP1C1 y sus derivados Los transportadores SLC T1 y T2 T1 y T2 barrera hematoencefálica las hormonas tiroideas La tiroxina

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