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El ciclo de glioxilato es necesario para la virulencia fúngica
1Whitehead Institute for Biomedical Research, Nine Cambridge Center, Massachusetts 02142, USA.
Nature
|July 14, 2001
Resumen
El ciclo de glioxilato es crucial para las infecciones fúngicas. Sus enzimas clave, como la liasa isocitrato (ICL1), se regulan al alza durante la interacción de los macrófagos, lo que afecta a la virulencia de Candida albicans.
Área de la Ciencia:
- La micología médica La micología médica.
- La patogénesis microbiana es la patogénesis microbiana.
- Biología Molecular Biología Molecular
Sus antecedentes:
- Candida albicans causa la mayoría de las infecciones fúngicas en individuos inmunodeprimidos.
- Los macrófagos y los neutrófilos suelen controlar la Candida, pero los pacientes neutropénicos son muy susceptibles.
- Comprender las respuestas fúngicas a las células inmunes es vital para el tratamiento de la candidiasis.
Objetivo del estudio:
- Para identificar los genes fúngicos y las vías metabólicas activadas durante la interacción de las células inmunes del huésped.
- Para investigar el papel del ciclo de glioxilato en la virulencia de Candida albicans.
Principales métodos:
- Se utilizó el perfil de expresión de todo el genoma de Saccharomyces cerevisiae.
- Se analizaron los cambios en la expresión génica de Candida albicans tras la fagocitosis por los macrófagos.
- Evaluó la virulencia de los mutantes de Candida albicans que carecen de enzimas clave del ciclo del glioxilato en un modelo de ratón.
Principales resultados:
- La fagocitosis por los macrófagos induce los genes del ciclo del glioxilato en Saccharomyces cerevisiae.
- Candida albicans regula hacia arriba la isocitrato liasa (ICL1) y la malato sintasa (MLS1) después de la fagocitosis.
- Los mutantes de Candida albicans que carecen de ICL1 muestran una virulencia significativamente reducida en ratones.
Conclusiones:
- El ciclo de glioxilato es una vía metabólica significativa durante la patogénesis microbiana.
- La liasa isocitrato (ICL1) es esencial para la virulencia de Candida albicans.
- La importancia de esta vía se extiende a otros patógenos como la Mycobacterium tuberculosis.
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