2006, Número 3
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Rev Salud Publica Nutr 2006; 7 (3)
Nutrientes antioxidantes como agentes preventivos de cáncer, una revisión
López-Rodríguez G
Idioma: Español
Referencias bibliográficas: 83
Paginas:
Archivo PDF: 76.07 Kb.
RESUMEN
La producción de radicales libres (RL) aunado a la formación de especies reactivas de oxígeno (ERO) son parte inherente al metabolismo, procesos además necesarios para el mantenimiento de funciones vitales. Sin embargo el desequilibrio entre la producción de ERO y el estado antioxidante de una célula intacta provoca estrés oxidativo (EO). El daño endógeno al ADN es la principal causante de la vejez y de enfermedades degenerativas tales como el cáncer. Una vez que la célula esta iniciada, progresa y se convierte en maligna, presenta un crecimiento incontrolado que caracteriza a las neoplasias. El ataque de ERO causan oxidación, siendo el mayor factor de riesgo en el proceso de carcinogénesis. El efecto de los nutrientes antioxidantes ha sido evaluado en las 3 etapas del cáncer, iniciación, promoción y progresión, en trabajos de revisión se evidencia la eficacia de la vitamina C, E y el B- caroteno en el proceso de carcinogénesis en donde se señala que estos nutrientes tienen función en la eliminación de carcinógenos, inhibición de pre carcinógenos y la reparación del daño al ADN. Esto ha ocasionado el uso de múltiples nutrientes antioxidantes como agentes preventivo, se han utilizado de forma aislada o en combinación, durante tiempos cortos e incluso suplementación a largo plazo. Pese a tantas investigaciones sobre el tema no es claro el efecto específico del uso de antioxidantes, ni se han establecido dosis efectivas para prevenir un proceso de iniciación de cáncer por grupos de edad.
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