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Consorcio de Imagenología de Alzheimer

Vincent Dore1,2, Pierrick Bourgeat3, Ryuichi Harada4

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Resumen
Este resumen es generado por máquina.

El trazador PET 18F-SMBT-1 revela diferencias regionales en la astrogliosis reactiva en el continuo de la enfermedad de Alzheimer (EA). La 18F-SMBT-1 elevada en personas cognitivamente no afectadas predice la acumulación de beta-amiloide, lo que sugiere su potencial como marcador pronóstico temprano de la EA.

Palabras clave:
astrogliosismarcadores pronósticosenfermedad de AlzheimerneuroimagenPET18F-SMBT-1

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Área de la Ciencia:

  • Neuroimagen
  • Neurodegeneración
  • Investigación de la enfermedad de Alzheimer

Sus antecedentes:

  • La monoamino oxidasa B (MAO-B) se sobreexpresa en astrocitos reactivos y está implicada en la neurodegeneración.
  • Se ha observado un aumento de la unión del trazador PET MAO-B 18F-SMBT-1 en etapas preclínicas de la enfermedad de Alzheimer (EA).
  • La distribución regional y el efecto de la unión anormal de 18F-SMBT-1 en la beta-amiloide (Aβ) a lo largo del continuo de la EA siguen sin estar claros.

Objetivo del estudio:

  • Investigar la distribución regional de la unión de 18F-SMBT-1 en el continuo de la enfermedad de Alzheimer (EA).
  • Evaluar la relación entre la unión de 18F-SMBT-1 y la acumulación de Aβ.
  • Evaluar 18F-SMBT-1 como un posible marcador pronóstico para la EA en etapa temprana.

Principales métodos:

  • Se realizó una tomografía por emisión de positrones (PET) con 18F-NAV4694, 18F-MK6240 y 18F-SMBT-1 en 144 sujetos cognitivamente no afectados (CU), 24 sujetos con deterioro cognitivo leve (MCI) A+ y 20 sujetos con EA A+.
  • Las relaciones de valor de absorción estandarizado (SUVR) de PET de Aβ y tau se convirtieron a Centiloides (CL) y CenTauR (CTR).
  • Se analizó la relación entre la unión de 18F-SMBT-1 y la acumulación de Aβ, particularmente en participantes CU A-.

Principales resultados:

  • Se observaron distintos patrones de unión de 18F-SMBT-1 en la región a lo largo del continuo de la EA.
  • La unión de 18F-SMBT-1 fue mayor en individuos CU A+ en comparación con los individuos CU A-.
  • La elevada retención de 18F-SMBT-1 en participantes CU A- predijo significativamente una mayor tasa de acumulación de Aβ e identificó a los individuos con probabilidad de desarrollar patología de EA.

Conclusiones:

  • 18F-SMBT-1 permite la evaluación cuantitativa de la astrogliosis reactiva regional en el continuo de la EA.
  • La 18F-SMBT-1 elevada en individuos cognitivamente no afectados sirve como predictor de la acumulación futura de Aβ.
  • 18F-SMBT-1 muestra promesa como marcador pronóstico para la EA en etapa temprana, lo que sugiere la modulación de la función astrocítica como objetivo terapéutico.