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Ciencia básica y patogénesis
Plamena P Powla1, Theyaneshwaran Jayaprakash2, Connor Lee Cornelison2
1Indiana University School of Medicine, Indianapolis, IN, USA.
Alzheimer's & dementia : the journal of the Alzheimer's Association
|December 23, 2025
Resumen
Este estudio revela que la proteína tau se propaga de manera diferente a través de las redes cerebrales en la enfermedad de Alzheimer, con una mayor difusión en la red frontoparietal (FPN) y la red de modo predeterminado (DMN). La difusión de tau también es más rápida en mujeres que en hombres, particularmente en la red del sistema límbico (LSN).
Área de la Ciencia:
- Neurociencia
- Ingeniería Biomédica
- Imagen Médica
Sus antecedentes:
- La enfermedad de Alzheimer (EA) se caracteriza por la propagación de ovillos de tau por el cerebro, lo que provoca deterioro cognitivo.
- Las regiones corticales con bajos niveles de tau están funcionalmente conectadas a regiones con altos niveles de tau, lo que sugiere patrones de difusión específicos de la red.
- La EA temprana muestra hipoconectividad relacionada con tau en la red de modo predeterminado (DMN), lo que indica una propagación diferencial a través de redes funcionales.
Objetivo del estudio:
- Investigar la difusión de tau a través de redes cerebrales funcionalmente conectadas.
- Determinar si la difusión de tau difiere entre distintas redes funcionales.
- Examinar las diferencias basadas en el sexo en los patrones de difusión de tau.
Principales métodos:
- Se utilizaron modelos de difusión de redes multinivel adaptados de modelos de influencia social.
- Se analizaron datos de 321 sujetos de la Iniciativa de Neuroimagen de la Enfermedad de Alzheimer (ADNI 3).
- Se comparó la difusión de tau a través de redes funcionales (DMN, LSN, FPN, DAN, SMN, VISN, VAN) y se investigaron las interacciones sexuales.
Principales resultados:
- Se observaron diferencias significativas en la difusión entre las redes de atención dorsal (DAN), sistema límbico (LSN), sensoriomotora (SMN), atención ventral (VAN) y visual (VISN) en comparación con la DMN.
- La red frontoparietal (FPN) y la red de modo predeterminado (DMN) exhibieron las tasas más altas de difusión de tau.
- Las mujeres mostraron una difusión de tau más fuerte en la LSN, lo que sugiere una propagación más rápida en mujeres que en hombres.
Conclusiones:
- La difusión de tau es mayor en la FPN y la DMN, lo que concuerda con hallazgos previos sobre el metabolismo de la glucosa específico de la red en la EA.
- El aumento de la difusión de tau en la LSN de las mujeres corrobora investigaciones previas sobre una mayor distribución de tau en las regiones límbicas de las mujeres.
- El estudio destaca los patrones de difusión de tau específicos de la red y diferenciados por sexo en la enfermedad de Alzheimer.
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