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Salud Pública

Warnakulasuriya Madb Fernando1,2, Ralph N Martins3,4,5,6,7,8,9,10,11,12, Stephanie R Rainey-Smith1,9,13,14,15,16,4,17,18

  • 1Edith Cowan University, Perth, Western Australia, Australia.

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Resumen

La edad, el sexo y el estado de APOE ε4 impactan significativamente la microbiota intestinal y la producción de ácidos grasos de cadena corta (AGCC) en la enfermedad de Alzheimer preclínica (EA). Las mujeres mayores portadoras de APOE ε4 muestran la mayor disminución de butirato, lo que sugiere que las intervenciones para la salud intestinal pueden retrasar la progresión de la EA.

Palabras clave:
microbiota intestinalenfermedad de AlzheimerAPOE ε4ácidos grasos de cadena cortasalud públicaintervenciones probióticas

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Área de la Ciencia:

  • Investigación del microbioma; Mecanismos de enfermedades neurodegenerativas; Eje intestino-cerebro

Sus antecedentes:

  • La enfermedad de Alzheimer (EA) es un trastorno neurodegenerativo progresivo.; Los cambios en la composición de la microbiota intestinal pueden influir en la patogénesis de la EA a través de interacciones intestino-cerebro.; Las etapas preclínicas de la EA son críticas para comprender las vías tempranas de la enfermedad.

Objetivo del estudio:

  • Investigar el impacto de la edad, el sexo y el genotipo APOE ε4 en la composición de probióticos intestinales.; Analizar la producción de metabolitos microbianos, específicamente ácidos grasos de cadena corta (AGCC).; Comprender las alteraciones del eje intestino-cerebro en individuos cognitivamente sanos en riesgo de EA.

Principales métodos:

  • Análisis de muestras de heces de 123 participantes del Australian Imaging Biomarkers and Lifestyle (AIBL) y el WA Memory Study (WAMS).; Secuenciación metagenómica para evaluar la composición de la microbiota intestinal, centrándose en Bifidobacterium y Lactobacillus.; Cromatografía de gases-líquidos para medir AGCC como butirato, propionato y acetato.

Principales resultados:

  • Los individuos mayores (≥70 años) exhibieron una menor diversidad microbiana con descensos en Bacteroidetes y Firmicutes.; Las mujeres mostraron menor Firmicutes, lo que llevó a una menor producción de butirato.; Los portadores mayores de APOE ε4 tuvieron una disminución del butirato y un aumento del acetato, con reducciones significativas en Bifidobacterium y Lactobacillus.

Conclusiones:

  • La edad, el sexo y el estado de APOE ε4 influyen significativamente en la microbiota intestinal y los perfiles de AGCC en la EA preclínica.; La disminución del butirato, especialmente en mujeres mayores portadoras de APOE ε4, indica una mayor vulnerabilidad a la disbiosis y la inflamación.; Las intervenciones probióticas dirigidas pueden restaurar el equilibrio intestinal y potencialmente retrasar la progresión de la EA.