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Este resumen es generado por máquina.

La infección por SARS-CoV-2 exacerba la deficiencia de MTHFR, causando problemas en la barrera hematoencefálica y neuroinflamación. Esto puede aumentar el riesgo de Parkinson.

Palabras clave:
neurocienciavirologíagenética

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Área de la Ciencia:

  • Neurociencia
  • Virología
  • Genética

Sus antecedentes:

  • La metilentetrahidrofolato reductasa (MTHFR) es vital para el metabolismo de un carbono, lo que afecta la síntesis de neurotransmisores y la metilación del ADN.
  • Las polimorfismos de MTHFR se asocian con demencia vascular, enfermedad de Parkinson (EP) y mayor gravedad de COVID-19.
  • Los ratones con deficiencia de Mthfr presentan déficits cognitivos y mayor patología similar a la EP.

Objetivo del estudio:

  • Investigar si la infección por SARS-CoV-2 acelera la demencia vascular y la EP en ratones con deficiencia de MTHFR.
  • Modelar el impacto de la deficiencia de MTHFR en los efectos neurológicos inducidos por SARS-CoV-2.

Principales métodos:

  • Se infectaron ratones con deficiencia de MTHFR (Mthfr+/-) y sus compañeros de camada de tipo salvaje (WT) con SARS-CoV-2 adaptado a ratón (MA10) o se les aplicó un placebo.
  • Se monitorizó la pérdida de peso de los ratones y se analizaron los tejidos para determinar la carga viral, la integridad de la barrera hematoencefálica (BHE) y los marcadores de EP.
  • Se realizó metabolómica plasmática para evaluar los cambios bioquímicos.

Principales resultados:

  • La infección por MA10 causó pérdida de peso y títulos virales pulmonares comparables tanto en ratones Mthfr+/- como en WT, sin virus detectable en el cerebro.
  • Los ratones Mthfr+/- mostraron una mayor alteración de la barrera hematoencefálica (BHE), neuroinflamación (IL-1β, microglia) y reducción de dopamina plasmática.
  • La infección por SARS-CoV-2 disminuyó las neuronas dopaminérgicas y los niveles de tirosina hidroxilasa, al tiempo que aumentó la alfa-sinucleína en ratones Mthfr+/-.

Conclusiones:

  • La infección por SARS-CoV-2 induce disfunción de la BHE, neuroinflamación y reducción de dopamina en ratones con deficiencia de MTHFR.
  • El estudio sugiere un mayor riesgo de progresión de la enfermedad de Parkinson en personas con deficiencia de MTHFR después de la infección por SARS-CoV-2.