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Salud Pública

Giulio Maria Pasinetti1,2, Ruth Iban-Arias1,3, Nicole Less4

  • 1Icahn School of Medicine at Mount Sinai, New York, NY, USA.

Alzheimer's & dementia : the journal of the Alzheimer's Association
|December 23, 2025
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Resumen
Este resumen es generado por máquina.

La exposición a la contaminación del aire (PM2.5) y al calor extremo altera la comunicación del eje intestino-cerebro y el metabolismo en ratones, incluso sin un deterioro cognitivo inmediato. Esto resalta la necesidad de estrategias de salud pública que consideren los riesgos ambientales para la enfermedad de Alzheimer.

Palabras clave:
Salud PúblicaCambio ClimáticoContaminación del AireEnfermedad de AlzheimerEstrés por CalorEje Intestino-CerebroMetabolismoDisfunción SinápticaDisbiosis Intestinal

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Área de la Ciencia:

  • Salud Ambiental; Neurociencia; Toxicología

Sus antecedentes:

  • El cambio climático exacerba los problemas de salud a través del calor extremo y las partículas (PM2.5).
  • La exposición combinada a PM2.5 y estrés por calor empeora las enfermedades respiratorias, cardiovasculares y neurodegenerativas.
  • Las poblaciones de edad avanzada son particularmente vulnerables a estos factores estresantes ambientales y a la enfermedad de Alzheimer.

Objetivo del estudio:

  • Investigar los efectos combinados de las PM2.5 ambientales y el estrés por calor en un modelo de ratón de enfermedad de Alzheimer de inicio temprano (EOAD).
  • Comprender el impacto de estos factores ambientales en las vías metabólicas e inmunoinflamatorias.

Principales métodos:

  • Se utilizó un modelo experimental de ratón de enfermedad de Alzheimer de inicio temprano (EOAD).
  • Se expusieron ratones a condiciones controladas que simulaban PM2.5 ambientales y estrés por calor extremo.
  • Se analizaron las alteraciones en el metabolismo energético, la función mitocondrial, la comunicación del eje intestino-cerebro y la señalización inmunitaria.

Principales resultados:

  • La exposición a corto plazo alteró el metabolismo energético y la respiración mitocondrial, lo que se relacionó con disfunción sináptica.
  • Se identificó un deterioro de la permeabilidad intestinal y disbiosis intestinal, que afectaron la señalización del eje intestino-cerebro.
  • No se observó deterioro cognitivo a pesar de las importantes alteraciones metabólicas e inmunitarias.

Conclusiones:

  • Los factores ambientales impactan significativamente las vías metabólicas e inmunitarias relevantes para la enfermedad de Alzheimer.
  • Los insultos ambientales en etapa temprana pueden alterar mecanismos biológicos cruciales sin síntomas cognitivos inmediatos.
  • Las estrategias preventivas de salud pública deben incorporar la evaluación de riesgos ambientales para personas en riesgo de enfermedad de Alzheimer.