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Ciencia básica y patogénesis
Dibyadeep Datta1, Dinara Bolat1, Isabella Perone1
1Yale University, New Haven, CT, USA.
Alzheimer's & dementia : the journal of the Alzheimer's Association
|December 24, 2025
Resumen
Los agregados de tau fosforilada (pT217-tau) en las dendritas indican degeneración neuronal temprana y siembra potencial de la patología de la enfermedad de Alzheimer. Este hallazgo explica por qué pT217-tau es un biomarcador eficaz para predecir la enfermedad de Alzheimer.
Área de la Ciencia:
- Neurociencia
- Descubrimiento de biomarcadores
- Investigación de la enfermedad de Alzheimer
Sus antecedentes:
- Un biomarcador líquido novedoso, pT217-tau, predice la enfermedad de Alzheimer (EA) antes del deterioro cognitivo.
- Comprender el papel de pT217-tau en la patología cerebral es crucial para la eficacia del tratamiento temprano de la EA.
- La expresión cerebral de pT217-tau soluble en etapas tempranas y su vínculo con los marcadores de neurodegeneración siguen sin estar claros.
Objetivo del estudio:
- Investigar la localización subcelular y la función de pT217-tau en etapas tempranas en el cerebro de macacos Rhesus envejecidos.
- Dilucidar la relación entre pT217-tau y marcadores de neurodegeneración y patología tau.
- Comprender el mecanismo por el cual pT217-tau predice la patología de la EA.
Principales métodos:
- Se utilizó inmunofluorescencia multietiqueta y microscopía inmunoelectrónica.
- Se examinó la localización subcelular de pT217-tau en la corteza entorrinal (ERC) y la corteza prefrontal dorsolateral (dlPFC) de macacos envejecidos.
- Se investigó la patología tau natural en un modelo de primate no humano de EA esporádica.
Principales resultados:
- pT217-tau se localiza en las dendritas de neuronas excitatorias, coexpresando con marcadores de degeneración vacuolar autofágica, disfunción endolisosomal y neurodegeneración.
- pT217-tau se acumula en compartimentos postsinápticos, incluyendo espinas y tallos dendríticos, interactuando con microtúbulos y endosomas.
- Se observó tráfico transináptico de pT217-tau entre neuronas cercanas a sinapsis excitatorias.
Conclusiones:
- Los agregados de pT217-tau en etapas tempranas en microtúbulos, alteran el tráfico endosomal y contribuyen a la degeneración dendrítica y la disfunción neuronal.
- pT217-tau se transporta entre neuronas, potencialmente sembrando patología tau en circuitos cerebrales superiores y volviéndose accesible al LCR y la sangre.
- La expresión dendrítica de pT217-tau con signos tempranos de degeneración explica su poder predictivo para la futura enfermedad de Alzheimer.
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