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Stella R Wroblewski1, Sara Morris1, Gabrielle Blahusiak1

  • 1Tulane University, New Orleans, LA, USA.

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Resumen
Este resumen es generado por máquina.

La inflamación periférica altera la microglía, afectando a las células cerebrales a largo plazo. Estos cambios persisten incluso después de que la inflamación desaparece, lo que podría afectar la neurodegeneración.

Palabras clave:
microglíainflamación periféricaenfermedad de Alzheimerneurodegeneracióntranscriptómica

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Área de la Ciencia:

  • Neurociencia
  • Inmunología
  • Genómica

Sus antecedentes:

  • La inflamación periférica es un factor de riesgo conocido para la neurodegeneración.
  • Se hipotetiza que la microglía, las células inmunitarias del cerebro, se ven afectadas por la inflamación periférica.
  • Estudios previos indican que los cambios transcripcionales de la microglía ocurren rápidamente y persisten a largo plazo después de la inflamación.

Objetivo del estudio:

  • Investigar la hipótesis de que la inflamación periférica desencadena cambios transcripcionales en la microglía.
  • Determinar el impacto de estos cambios microgliales en la patología de la enfermedad de Alzheimer (EA), específicamente beta-amiloide (Aβ) y tau.
  • Analizar los efectos a largo plazo de la inflamación periférica en la homeostasis microglial y las interacciones neuronales.

Principales métodos:

  • Se sometió a ratones 3xTg-AD a una infección viral periférica para inducir inflamación sistémica.
  • Se analizaron los hemisferios cerebrales a los 7 días y 2 meses postinfección utilizando inmunotinción, secuenciación Multiome (scRNA-seq y ATAC-seq) y transcriptómica espacial.
  • Se midieron los niveles de citoquinas circulantes mediante ELISA.

Principales resultados:

  • La transcriptómica espacial identificó 265 genes con expresión diferencial en la microglía y tres perfiles microgliales únicos a los 7 días postinfección.
  • La clasificación algorítmica de células sugirió una mayor captación de neuronas glutamatérgicas y células endoteliales por la microglía.
  • A los 2 meses, la microglía exhibió un fenotipo proinflamatorio con una downregulated expresión de genes de función sináptica, correlacionándose con una mayor expresión de Apoe y Psen1&2.

Conclusiones:

  • La inflamación periférica inducida por virus altera significativamente el estado y la homeostasis de la microglía en un modelo 3xTg-AD.
  • Los perfiles transcripcionales de la microglía permanecen alterados mucho después de que la inflamación sistémica se ha resuelto.
  • Los eventos inflamatorios periféricos inducen cambios duraderos en la microglía, con una exploración continua de sus implicaciones para la neurodegeneración.