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Vector polimérico sensible a la acidez tumoral para la entrega activa de siRNA dirigido

Chun-Yang Sun1, Song Shen1, Cong-Fei Xu2

  • 1The CAS Key Laboratory of Innate Immunity and Chronic Disease, School of Life Sciences and Medical Center, University of Science & Technology of China , Hefei, Anhui 230027, PR China.

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Los nuevos nanovectores se desprenden de sus capas protectoras en los tumores, mejorando la entrega de siRNA. Este enfoque supera la PEGilación

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Área de la Ciencia:

  • Ingeniería biomédica
  • Nanotecnología
  • Entrega de drogas

Sus antecedentes:

  • La PEGilación superficial de los vectores de siRNA impide la adsorción de proteínas y el aclaramiento de RES, pero dificulta la absorción celular.
  • Los nanovectores sensibles a los estímulos y desmontables ofrecen una solución para una mayor internalización celular y una circulación prolongada.
  • El pH extracelular del tumor (pHe) es un estímulo prometedor, pero el diseño de sistemas sensibles es un desafío debido a las sutiles diferencias de pH.

Objetivo del estudio:

  • Desarrollar un nuevo copolímero puente sensible al ácido para la administración sistémica de siRNA dirigida al tumor.
  • Para crear nanovectores sensibles a los estímulos que mejoren la absorción celular mientras mantienen la circulación sanguínea prolongada.
  • Para superar el dilema del doble efecto de la PEGilación en el rendimiento del vector siRNA.

Principales métodos:

  • Desarrollo de un simple copolímero puente sensible al ácido.
  • Formación de sistemas de administración de micelleplex (Dm-NP) con una corona de polietileno glicol (PEG).
  • Incorporación de un enlace sensible al pH para el desprendimiento de PEG y un péptido de penetración celular para una mayor absorción.

Principales resultados:

  • Dm-NP demostró una corona PEG estable para la circulación prolongada y la evasión RES.
  • La ruptura del enlace sensible al ácido en los sitios del tumor desencadenó el desprendimiento de PEG, facilitando la orientación celular.
  • La exposición al péptido de penetración celular tras la eliminación del PEG aumentó significativamente la absorción celular.
  • Dm-NP logró una acumulación tumoral efectiva y una mayor inhibición del crecimiento del cáncer de pulmón de células no pequeñas.

Conclusiones:

  • El sistema Dm-NP desarrollado equilibra con éxito la circulación prolongada y la entrega celular dirigida.
  • El desprendimiento de PEG sensible a estímulos es una estrategia viable para mejorar la eficacia del nanovector en los tumores.
  • Este enfoque ofrece un método seguro y eficaz para la administración de siRNA y el tratamiento del cáncer.