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Las mitocondrias protegen contra un patógeno intracelular restringiendo el acceso al ácido fólico
Tânia Catarina Medeiros1, Jana Ovciarikova2, Xianhe Li1
1Metabolism of Infection Group, Max Planck Institute for Biology of Ageing, Cologne, Germany.
Science (New York, N.Y.)
|August 14, 2025
Resumen
El factor de transcripción activador 4 (ATF4) mejora el metabolismo del folato mitocondrial para limitar el crecimiento de patógenos. Esta defensa metabólica restringe el Toxoplasma gondii al controlar el acceso a los nutrientes esenciales.
Área de la Ciencia:
- El metabolismo celular
- Biología mitocondrial
- Enfermedad infecciosa
Sus antecedentes:
- Las mitocondrias son fundamentales para el metabolismo celular y la competencia de nutrientes con los patógenos.
- El papel del metabolismo mitocondrial en la defensa del huésped contra la infección no se comprende completamente.
Objetivo del estudio:
- Investigar si y cómo las células utilizan el metabolismo mitocondrial para la protección contra la invasión microbiana.
- Para aclarar el papel de la activación del factor de transcripción 4 (ATF4) en la defensa del huésped.
Principales métodos:
- Infección de células de mamíferos en cultivo con Toxoplasma gondii.
- Análisis de los niveles de ADN mitocondrial y el metabolismo de un carbono.
- Investigando el papel de ATF4 en la regulación de las vías metabólicas.
Principales resultados:
- La activación de ATF4 conduce a un aumento del ADN mitocondrial al promover el metabolismo de un carbono dependiente del ácido fólico.
- La detección del huésped del estrés mitocondrial desencadena ATF4.
- ATF4 limita el acceso de Toxoplasma al ácido fólico, inhibiendo el crecimiento de los parásitos al restringir la síntesis de monofosfato de desoxitimidina.
Conclusiones:
- ATF4 orquesta una estrategia de defensa metabólica mitocondrial contra el Toxoplasma gondii.
- Esta defensa se basa en el recableado del metabolismo mitocondrial para controlar la disponibilidad de folato.
- El metabolismo mitocondrial juega un papel crítico en las interacciones huésped-patógeno.
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