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In order to be passed through generations, genomic DNA must be undamaged and error-free. However, every day, DNA in a cell undergoes several thousand to a million damaging events by natural causes and external factors. Ionizing radiation such as UV rays, free radicals produced during cellular respiration, and hydrolytic damage from metabolic reactions can alter the structure of DNA. Damages caused include single-base alteration, base dimerization, chain breaks, and cross-linkage.
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Colapso micronuclear por daño oxidativo

Melody Di Bona1,2, Yanyang Chen3, Albert S Agustinus1,2,4

  • 1Department of Radiation Oncology, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA.

Science (New York, N.Y.)
|August 29, 2024
PubMed
Resumen
Este resumen es generado por máquina.

Las especies reactivas de oxígeno (ROS) generadas por las mitocondrias interrumpen los micronúcleos de las células cancerosas al alterar la función de la proteína corporal multivesicular cargada 7 (CHMP7), lo que lleva al daño cromosómico y promueve la progresión del cáncer, especialmente bajo hipoxia.

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Área de la Ciencia:

  • Biología celular
  • Investigación del cáncer
  • Oncología molecular

Sus antecedentes:

  • Los micronúcleos que contienen cromosomas son característicos de los cánceres agresivos.
  • La ruptura micronuclear conduce a la inestabilidad cromosómica, cambios epigenéticos y inflamación.
  • Los mecanismos que protegen la integridad micronuclear siguen siendo en gran medida desconocidos.

Objetivo del estudio:

  • Investigar los mecanismos por los que las especies reactivas de oxígeno (ROS) afectan la integridad micronuclear.
  • Para aclarar el papel de la proteína de cuerpo multivesicular cargada 7 (CHMP7) en la interrupción micronuclear mediada por ROS.

Principales métodos:

  • Se investigó la interacción entre ROS derivados de las mitocondrias y CHMP7 dentro de los micronúcleos.
  • Se analizó el efecto de ROS en la oligomerización de CHMP7 y su interacción con LEMD2.
  • Se examinaron las consecuencias del eje ROS-CHMP7 sobre la integridad cromosómica y la estabilidad micronuclear en condiciones normóxicas e hipóxicas.

Principales resultados:

  • Los ROS derivados de las mitocondrias interrumpen los micronúcleos al alterar la función de CHMP7, un componente del complejo ESCRT-III.
  • Los ROS promueven la retención de CHMP7 y la oligomerización dentro de los micronúcleos, interrumpiendo las interacciones con otras proteínas ESCRT-III y la unión a LEMD2.
  • Este eje patológico da como resultado la ruptura cromosómica y la desintegración micronuclear, particularmente en condiciones de tumor hipóxico.

Conclusiones:

  • Una nueva vía ROS-CHMP7 contribuye a la ruptura de la envoltura micronuclear y la inestabilidad genómica en el cáncer.
  • Esta vía vincula la disfunción mitocondrial y la hipoxia con los procesos que impulsan la progresión del cáncer.
  • Comprender este mecanismo ofrece objetivos terapéuticos potenciales para los cánceres agresivos.