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Consorcio de Imagenología de Alzheimer

Yuta Katsumi1, Ryan Eckbo1, Michael Brickhouse2

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Resumen
Este resumen es generado por máquina.

La enfermedad de Alzheimer de inicio temprano (EOAD) altera la conectividad de las redes cerebrales, mostrando conexiones más fuertes en las regiones afectadas. Esta hiperconectividad se correlaciona con el deterioro cognitivo y la atrofia cerebral en pacientes con EOAD.

Palabras clave:
Alzheimer de inicio tempranoconectividad de redes cerebraleshiperconectividaddeterioro cognitivoatrofia cerebral

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Área de la Ciencia:

  • Neurociencia
  • Imagenología Médica
  • Neurología

Sus antecedentes:

  • La enfermedad de Alzheimer esporádica de inicio temprano (EOAD) implica neurodegeneración principalmente en las regiones temporoparietales posteriores.
  • Estas regiones son nodos críticos en las principales redes cerebrales, incluidas las redes del modo por defecto, frontoparietal, del lenguaje y de la atención dorsal.
  • Estudios previos sobre conectividad funcional en EOAD utilizaron muestras pequeñas, arrojando resultados inconsistentes.

Objetivo del estudio:

  • Investigar las alteraciones en la integridad funcional de las redes cerebrales en una gran cohorte de pacientes con EOAD esporádica.
  • Determinar si la conectividad funcional alterada en la EOAD se asocia con deterioro cognitivo y atrofia cortical.

Principales métodos:

  • Análisis de datos de resonancia magnética funcional de todo el cerebro de 239 pacientes con EOAD esporádica y 68 controles cognitivamente intactos (CU) del Estudio Longitudinal de la Enfermedad de Alzheimer de Inicio Temprano (LEADS).
  • Preprocesamiento y control de calidad de los datos de RM, seguido de análisis de conectividad funcional basado en semillas dentro de las regiones de la firma de EOAD identificadas.
  • Comparación de mapas de conectividad funcional entre los grupos de EOAD y CU, controlando la edad, el sexo y el movimiento de la cabeza.

Principales resultados:

  • Los pacientes con EOAD exhibieron una conectividad funcional significativamente mayor dentro de las regiones de la firma de EOAD en comparación con los participantes de CU, afectando a múltiples redes a gran escala.
  • En los pacientes con EOAD, el aumento de la conectividad funcional dentro de estas redes se relacionó con un mayor deterioro cognitivo y atrofia cortical.
  • El análisis exploratorio reveló una hiperconectividad prominente relacionada con la EA que involucra las redes del modo por defecto y frontoparietal.

Conclusiones:

  • La EOAD esporádica se caracteriza por una alteración significativa de la conectividad funcional intrínseca en regiones corticales vulnerables.
  • Estos hallazgos resaltan la vulnerabilidad selectiva de las redes funcionales corticales en la EOAD.
  • Las alteraciones de conectividad observadas pueden explicar los distintos patrones de patología y déficits cognitivos en este fenotipo de la enfermedad de Alzheimer.