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Consorcio de Imagenología de Alzheimer

Alejandra O Morcillo-Nieto1,2, Mateus Rozalem Aranha2,3, José Enrique Arriola-Infante1,2

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Resumen
Este resumen es generado por máquina.

Las hiperintensidades de la sustancia blanca (HSB) disminuyeron inesperadamente con el tiempo en personas con síndrome de Down (SD), particularmente en aquellas con enfermedad de Alzheimer (EA) sintomática. Este hallazgo ofrece nuevas perspectivas sobre la etiología de las HSB en el SD y posibles objetivos de intervención.

Palabras clave:
hiperintensidades de la sustancia blancasíndrome de Downenfermedad de Alzheimerneuroimagenestudios longitudinales

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Área de la Ciencia:

  • Neuroimagen
  • Neurología
  • Genética

Sus antecedentes:

  • El síndrome de Down (SD) es una forma genética de la enfermedad de Alzheimer (EA) con bajos factores de riesgo vascular.
  • Las hiperintensidades de la sustancia blanca (HSB) son comunes en el SD, relacionadas con enfermedades de pequeños vasos y neurodegeneración.
  • Los cambios temporales de las HSB y su vínculo con la patología de la EA en el SD no se comprenden bien.

Objetivo del estudio:

  • Investigar la evolución longitudinal de las HSB en personas con SD a lo largo del continuo de la EA.
  • Determinar la asociación entre los cambios en las HSB y las características clínicas y patológicas basales en el SD.

Principales métodos:

  • Estudio longitudinal de RM de 86 personas con SD (EA asintomática y sintomática) y 47 controles sanos.
  • Segmentación de HSB utilizando un pipeline longitudinal en imágenes FLAIR.
  • Análisis de los cambios en el volumen de HSB en relación con la edad, el estadio clínico de la EA, los biomarcadores de EA en LCR y el estado de microhemorragias.

Principales resultados:

  • El volumen de HSB disminuyó significativamente con la edad en personas con SD, a diferencia de los controles sanos.
  • Esta disminución fue más pronunciada en la EA sintomática (SDS) que en la EA asintomática (ADS).
  • Los niveles de pTau181 y NfL en LCR se correlacionaron con los cambios en las HSB, mientras que la relación Aβ42/Aβ40 no lo hizo.

Conclusiones:

  • Las HSB disminuyen con el tiempo en el SD, especialmente en el SDS con HSB basales altas, un hallazgo no explicado por la atrofia.
  • Esto desafía las suposiciones previas sobre la progresión de las HSB en el SD.
  • Ofrece perspectivas novedosas sobre la etiología de las HSB en el SD y destaca las HSB como un resultado potencial para intervenciones dirigidas.