2-Methacryloyloxyethyl phosphorylcholine polymer (MPC)-coating improves the transfection activity of GALA-modified lipid nanoparticles by assisting the cellular uptake and intracellular dissociation of plasmid DNA in primary hepatocytes

Masami Ukawa, Hidetaka Akita, Tomoya Masuda, Yasuhiro Hayashi, Tomohiro Konno, Kazuhiko Ishihara, Hideyoshi Harashima

研究成果: Article査読

42 被引用数 (Scopus)

抄録

We previously reported that modification of GALA peptide on the surface of liposomes enhanced fusion with endosomal membrane, and cytoplasmic release of encapsulated macromolecules. We report herein that an additional coating of GALA-modified liposomes with 2-methacryloyloxyethyl phosphorylcholine (MPC) polymer resulted in a two order of magnitude enhancement in the transfection activity of encapsulating plasmid DNA (pDNA). Quantification of the delivered gene copies in whole cells and isolated nuclei revealed that the increase of transfection activity can be attributed to improved efficiencies in cellular uptake and post-nuclear delivery processes. Imaging studies revealed that the intracellular dissociation of pDNA from the lipid envelope is enhanced by GALA modification and further coating with MPC polymer in a stepwise manner. The MPC polymer-coating decreased the ζ-potential of GALA-modified liposomes, suggesting that it assisted in the functional display of negatively charged GALA on the cationic liposomes by providing shielding from mutual electrostatic interactions. Collectively, these data indicate that MPC polymer-coating induced the fusogenic activity of the GALA-modified envelope with endosomes, leading to a more effective cytoplasmic release pDNA. The extensive fusion of the lipid envelope may also reduce electrostatic interactions between mRNA and cationic lipid components, thereby resulting in an enhancement in the translation process.

本文言語English
ページ(範囲)6355-6362
ページ数8
ジャーナルBiomaterials
31
24
DOI
出版ステータスPublished - 2010 8月
外部発表はい

ASJC Scopus subject areas

  • 生物理学
  • バイオエンジニアリング
  • セラミックおよび複合材料
  • 生体材料
  • 材料力学

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