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La toxina del cólera promueve la adquisición de nutrientes derivados del huésped por parte del patógeno
Fabian Rivera-Chávez1, John J Mekalanos2
1Department of Microbiology, Harvard Medical School, Boston, MA, USA.
Nature
|August 2, 2019
Resumen
La toxina del cólera (CTX) producida por Vibrio cholerae crea un entorno intestinal pobre en hierro. Este nicho mejora el crecimiento de patógenos al permitir que las bacterias utilicen el hemo y los ácidos grasos derivados del huésped para la nutrición.
Área de la Ciencia:
- Microbiología
- Enfermedades infecciosas
- Patogénesis bacteriana
Sus antecedentes:
- El Vibrio cholerae causa el cólera, una enfermedad diarreica grave.
- La toxina del cólera (CTX) es crucial para la enfermedad grave y la transmisión de patógenos.
- El mecanismo por el cual V. cholerae alcanza altas concentraciones intestinales no se comprende completamente.
Objetivo del estudio:
- Investigar cómo V. cholerae alcanza altas concentraciones en el intestino durante la infección.
- Aclarar el papel de la toxina del cólera (CTX) en la colonización y el crecimiento intestinal de V. cholerae.
- Identificar las adaptaciones metabólicas de V. cholerae en el entorno intestinal del huésped.
Principales métodos:
- Análisis transcriptómico de V. cholerae durante la infección.
- Análisis genético de las vías de adquisición de hierro de V. cholerae (hemo y vibriobactina).
- Correlación de la patología ileal inducida por CTX con la disponibilidad de metabolitos y nutrientes.
Principales resultados:
- CTX induce una firma transcriptómica que sugiere un nicho intestinal agotado en hierro.
- Los genes para la adquisición de hierro de hemo y vibriobactina confieren una ventaja de crecimiento solo cuando se produce CTX.
- La congestión ileal inducida por CTX aumenta la biodisponibilidad del hemo y altera los metabolitos luminales (ácidos grasos, L-lactato).
- El crecimiento del patógeno depende de la absorción de hemo y ácidos grasos en una cepa productora de CTX.
Conclusiones:
- La enfermedad inducida por CTX crea un nicho metabólico empobrecido en el intestino.
- Este nicho promueve selectivamente el crecimiento de V. cholerae a través de la adquisición de hemo y ácidos grasos derivados del huésped.
- Comprender este mecanismo es clave para controlar la patogénesis del cólera.
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