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La vulnerabilidad neuronal y la diversidad multilineacional en la esclerosis múltiple

Lucas Schirmer1,2,3,4, Dmitry Velmeshev1,5, Staffan Holmqvist2

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La esclerosis múltiple (EM) daña neuronas específicas de la corteza superior y activa las células gliales. Este estudio revela cambios celulares en las lesiones de EM, destacando la vulnerabilidad de las neuronas y las respuestas gliales.

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Área de la Ciencia:

  • La neurociencia
  • Inmunología
  • La genómica

Sus antecedentes:

  • La esclerosis múltiple (EM) es una enfermedad neuroinflamatoria crónica caracterizada por una patología de lesión distinta en la materia gris y blanca y una neurodegeneración progresiva.
  • Comprender los cambios celulares y moleculares dentro de las lesiones de EM es crucial para dilucidar los mecanismos de la enfermedad e identificar objetivos terapéuticos.

Objetivo del estudio:

  • Investigar las alteraciones transcriptómicas específicas del tipo celular en las lesiones de esclerosis múltiple.
  • Identificar poblaciones neuronales vulnerables y patrones de activación gliales en el sistema nervioso central durante la EM.

Principales métodos:

  • Se empleó secuenciación de ARN de un solo núcleo (snRNA-seq) para perfilar cambios en la expresión génica a través de varios linajes celulares dentro de las lesiones de EM.
  • Se utilizó la hibridación multiplexa in situ para la validación de los hallazgos clave.
  • Los ensayos funcionales en ratones y cultivos de células humanas confirmaron la fagocitosis microglial de las transcripciones de mielina.

Principales resultados:

  • Se observó vulnerabilidad selectiva y pérdida de las neuronas de proyección excitatoria que expresan CUX2 en las capas corticales superiores, asociadas con la regulación al alza de los genes de respuesta al estrés y los ARN largos no codificantes.
  • Las firmas de oligodendrocitos estresados, astrocitos reactivos y microglía activada se encontraron predominantemente en los bordes de la lesión.
  • El ensayo snRNA-seq identificó microglías/macrófagos fagocitantes que ingieren transcripciones de mielina, y fue validado posteriormente mediante ensayos funcionales.

Conclusiones:

  • Las lesiones de EM exhiben cambios transcriptómicos específicos del linaje y la región, con distintos daños en las neuronas corticales y patrones de activación gliales.
  • La vulnerabilidad de las neuronas corticales y las respuestas gliales contribuyen a la progresión de las lesiones de esclerosis múltiple.