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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
PubMed
Resumen
Este resumen es generado por máquina.

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).

Palabras clave:
Enfermedad de AlzheimerProteína tauDifusión de tauRedes cerebralesNeuroimagenDiferencias sexuales

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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.