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El tRNA modificado químicamente mejora la capacidad de traducción del mRNA rico en codones cognados
Liangzhen Dong1, Jiayu Wang1, Qing Xia2
1State Key Laboratory of Natural and Biomimetic Drugs, Department of Molecular and Cellular Pharmacology, School of Pharmaceutical Sciences, Peking University, Beijing, China.
Nature communications
|August 22, 2025
Resumen
Los investigadores desarrollaron tRNA-plus para mejorar la traducción de la vacuna de ARN mensajero (ARNm). La sobreexpresión de ARN de transferencia específicos (ARNt) aumenta la producción de proteínas y mejora la eficacia de la vacuna, ofreciendo una nueva estrategia para el desarrollo de vacunas.
Área de la Ciencia:
- Biología molecular
- Vacunas y vacunas
- Biotecnología
Sus antecedentes:
- Las vacunas de ARN mensajero (ARNm) enfrentan desafíos con la inestabilidad y la traducción limitada de proteínas.
- La abundancia y las modificaciones del ARN de transferencia (ARNt) influyen en la estabilidad del ARNm y la producción de proteínas.
- El tRNA es un objetivo potencial para mejorar la eficiencia de la traducción del mRNA.
Objetivo del estudio:
- Desarrollar una nueva estrategia, tRNA-plus, para aumentar la traducción de mRNA mediante la modulación de la disponibilidad de tRNA.
- Investigar el impacto de la sobreexpresión de ARNt específicos en la estabilidad y la traducción del ARNm Spike del SARS-CoV-2.
- Evaluar la eficacia de los ARNt químicamente sintetizados y modificados y su codelivery con las vacunas de ARNm.
Principales métodos:
- Modulación artificial de la disponibilidad de ARNt a través de la sobreexpresión de ARNt específicos.
- Mejorar la estabilidad y la eficiencia de traducción del ARNm Spike del SARS-CoV-2.
- Síntesis de tRNA modificados químicamente con modificaciones específicas en el bucle anticodón y el bucle TΨC.
- Código de administración de la vacuna Spike mRNA y el tRNA a través de nanopartículas lipídicas in vivo.
Principales resultados:
- La sobreexpresión de tRNAs específicos aumentó la estabilidad y la eficiencia de la traducción del Spike mRNA, aumentando los niveles de proteínas hasta 4,7 veces.
- Los tRNA modificados sintetizados químicamente mostraron una eficacia de decodificación ~4 veces mayor, una estabilidad mejorada y una inmunotoxicidad reducida en comparación con los tRNA no modificados.
- La administración codificada de la vacuna de ARNm y el ARNt provocó respuestas inmunes aumentadas humoral y celular in vivo.
Conclusiones:
- La estrategia tRNA-plus mejora efectivamente la potencia de traducción del ARNm.
- Los tRNA modificados ofrecen una mejor eficacia de decodificación, estabilidad y inmunotoxicidad reducida.
- Este enfoque proporciona un método general para impulsar la traducción de ARNm con amplias aplicaciones.
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