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Ciencia básica y patogénesis
Guo Luo1, Jing Zhang1, Emmanuel Mignot1
1Stanford University School of Medicine, Palo Alto, CA, USA.
Alzheimer's & dementia : the journal of the Alzheimer's Association
|December 24, 2025
Resumen
Se encontró que una respuesta inmune adaptativa dirigida a la proteína tau acetilada, específicamente PHF6 aK311, mediada por HLA-DRB1*04:04, disminuye el riesgo de enfermedad de Alzheimer (EA). Esto sugiere nuevas estrategias terapéuticas para la EA.
Área de la Ciencia:
- Inmunología; Neurociencia; Genética
Sus antecedentes:
- La enfermedad de Alzheimer (EA) se caracteriza por ovillos neurofibrilares (ONF) formados por proteína tau agregada.
- La acetilación de tau, particularmente la región PHF6 (VQIVYK), es crucial para la agregación de tau.
- El papel del sistema inmune adaptativo, incluidas las células T y los tipos de HLA, en la patogénesis de la EA no se comprende completamente.
Objetivo del estudio:
- Investigar las asociaciones de HLA con la EA y la enfermedad de Parkinson (EP).
- Explorar la respuesta inmune adaptativa a la proteína tau modificada en la EA.
- Identificar posibles dianas terapéuticas para la EA basadas en las respuestas inmunes.
Principales métodos:
- Se analizaron las asociaciones de HLA en una cohorte grande (∼176.000) de individuos con EA/EP frente a controles.
- Se comparó la densidad postmortem de ONF/placas amiloides en el cerebro y los niveles de tau/Aβ42 en el líquido cefalorraquídeo (LCR) en pacientes con EA y controles (∼8.000).
- Se realizaron estudios de unión de HLA, estudios de tetrámeros de células T y ensayos de activación de células T (TCR) utilizando tau PHF6 en células Jurkat.
Principales resultados:
- Se identificó HLA-DRB1*04:04 como un efecto protector contra la EA.
- Se detectaron células T que reconocen PHF6 acetilado (PHF6 aK311) presentado por HLA-DRB1*04:04, con fenotipos distintos en pacientes con EA en comparación con los controles.
- Se identificaron clones de TCR específicos activados por tau PHF6 aK311 presentado por HLA-DRB1*04:04 tanto en pacientes con EA como en controles sanos.
Conclusiones:
- Una respuesta inmune adaptativa mediada por HLA-DRB1*04 contra tau PHF6 aK311 se asocia con una disminución del riesgo de EA.
- Este hallazgo abre posibilidades para estrategias terapéuticas novedosas dirigidas al sistema inmunitario en la EA.
- La comprensión de las respuestas específicas de las células T a la tau modificada puede conducir a nuevos enfoques diagnósticos y terapéuticos para la EA.
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