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Un mecanismo común de muerte celular inducido por antibióticos bactericidas
Michael A Kohanski1, Daniel J Dwyer, Boris Hayete
1Center for BioDynamics and Center for Advanced Biotechnology, Boston University, Boston, MA 02215, USA.
Cell
|September 7, 2007
Resumen
Los antibióticos bactericidas, a diferencia de los bacteriostáticos, desencadenan la producción letal de radicales hidroxilo en las bacterias. Dirigirse a los sistemas celulares que reparan este daño oxidativo podría mejorar la efectividad de los antibióticos.
Área de la Ciencia:
- Microbiología Microbiología.
- La bioquímica es la bioquímica.
- Biología Molecular Biología Molecular
Sus antecedentes:
- La clasificación de los antibióticos se basa en las interacciones del fármaco objetivo y la letalidad.
- Los mecanismos letales precisos de los antibióticos bactericidas aún no se comprenden por completo.
Objetivo del estudio:
- Para aclarar el mecanismo común de la muerte celular inducida por las principales clases de antibióticos bactericidas.
- Investigar el papel de los radicales hidroxilo en la acción bactericida de los antibióticos.
- Identificar objetivos potenciales para potenciar la eficacia de los antibióticos bactericidas.
Principales métodos:
- Análisis comparativo de la producción de radicales hidroxilo en bacterias tratadas con diferentes clases de antibióticos.
- Investigación de las vías celulares involucradas en la formación de radicales, incluido el ciclo del ácido tricarboxílico y los niveles de NADH.
- Evaluación de la estabilidad del racimo de hierro-azufre y participación en la reacción de Fenton.
- Evaluación de RecA como un objetivo potencial para mejorar la eficacia de los antibióticos.
Principales resultados:
- Las tres principales clases de antibióticos bactericidas estimulan la producción de radicales hidroxilo tanto en las bacterias Gram-negativas como en las Gram-positivas.
- Los antibióticos bacteriostáticos no inducen la producción de radicales hidroxilo.
- La formación de radicales hidroxilo está relacionada con el ciclo del ácido tricarboxílico, el agotamiento transitorio de NADH, la desestabilización del grupo de hierro-azufre y la reacción de Fenton.
- Dirigirse a las proteínas de respuesta al daño del ADN, como RecA, muestra potencial para potenciar los fármacos bactericidas.
Conclusiones:
- La generación de radicales hidroxilo es un mecanismo letal conservado para los principales antibióticos bactericidas, independientemente de su interacción directa con el fármaco objetivo.
- La reacción de Fenton, influenciada por los cambios metabólicos y la inestabilidad del grupo de hierro-azufre, media esta producción de radicales.
- La interferencia con las vías bacterianas de respuesta al estrés oxidativo presenta una estrategia prometedora para superar la resistencia a los antibióticos y mejorar los resultados del tratamiento.
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