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La interferencia del platino con las regiones no semilla de siRNA ajusta la capacidad de silenciamiento de la
Hanna K Hedman1, Finn Kirpekar, Sofi K C Elmroth
1Department of Biochemistry and Structural Biology, Center for Molecular Protein Science, Lund University, P.O. Box 124, SE-22100 Lund, Sweden.
Journal of the American Chemical Society
|July 5, 2011
Resumen
Los fármacos anticancerígenos cisplatino y oxaliplatino se utilizaron para platinar pequeños ARN interferentes (siARN). La platinación alteró la degradación del siRNA pero mantuvo la actividad biológica, aunque generalmente redujo la capacidad de silenciamiento, con el oxaliplatino teniendo un mayor efecto.
Área de la Ciencia:
- Biología Molecular Biología Molecular
- La interferencia del ARN (RNAi, por sus siglas en inglés)
- Desarrollo de Drogas Desarrollo de Drogas.
Sus antecedentes:
- Los ARN no codificantes, incluidos los pequeños ARN interferentes (siRNA) y los microARN (miRNA), juegan un papel crucial en la regulación de la expresión génica.
- Los siRNA se utilizan para el silenciamiento de genes, siendo la estabilidad sistémica un factor clave para las aplicaciones clínicas.
- Comprender cómo factores como los medicamentos de quimioterapia afectan la función del siRNA y el miRNA es esencial, particularmente en condiciones patológicas.
Objetivo del estudio:
- Para investigar el impacto del cisplatino y el oxaliplatino en la eficacia de silenciamiento de genes de los siRNAs.
- Para caracterizar los adductos de platino-ARN formados en los siRNA y su efecto sobre la estabilidad y función del ARN.
- Para comparar la influencia del cisplatino frente al oxaliplatino en el procesamiento del siRNA y la capacidad de silenciamiento.
Principales métodos:
- Construcción de siRNA dirigidos al ARNm Wnt-5a (NM_003352).
- Pre-platinación de la hebra de siRNA antisense con cisplatino u oxaliplatino.
- Detección y caracterización de los adductos de platino mediante electroforesis en gel y MALDI-MS.
- Evaluación de la capacidad de silenciamiento en las células HB2 utilizando un sistema de reportero de luciferasa.
Principales resultados:
- La platinización de siRNAs dio lugar a aductos que alteraron los patrones de degradación, ofreciendo protección contra la hidrólisis cerca de los sitios de modificación.
- MALDI-MS identificó y caracterizó con éxito el ARN platinado, utilizando los patrones isotópicos naturales del platino como huellas dactilares.
- Los siRNA platinizados por antisense mantuvieron la actividad biológica, con sitios de platinación fuera de la región crítica de la semilla.
- Se observó una tendencia general de reducción de la capacidad de silenciamiento para los siRNAs platinados.
- El oxaliplatino demostró un impacto más significativo en la capacidad de silenciamiento del siRNA en comparación con el cisplatino.
Conclusiones:
- Los fármacos anticancerígenos pueden modificar los siRNA, afectando su estabilidad y capacidad de silenciamiento de genes.
- El estudio proporciona información sobre la posible interferencia de los medicamentos de quimioterapia basados en platino con los mecanismos de RNAi.
- Existen diferencias sutiles entre el cisplatino y el oxaliplatino en su capacidad para interferir con el procesamiento de siRNA y miRNA.
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