Endosomal escape and the knockdown efficiency of liposomal-siRNA by the fusogenic peptide shGALA

Yu Sakurai, Hiroto Hatakeyama, Yusuke Sato, Hidetaka Akita, Kentaro Takayama, Sachiko Kobayashi, Shiroh Futaki, Hideyoshi Harashima

Research output: Contribution to journalArticlepeer-review

100 Citations (Scopus)


An siRNA that specifically silences the expression of mRNA is a potential therapeutic agent for dealing with many diseases including cancer. However, the poor cellular uptake and bioavailability of siRNA remains a major obstacle to clinical development. For efficient delivery to tumor tissue, the pharmacokinetics and intracellular trafficking of siRNA must be rigorously controlled. To address this issue, we developed a liposomal siRNA carrier, a multi-functional nano device (MEND). We describe herein an approach for systemic siRNA delivery to tumors by combining the MEND system with shGALA, a fusogenic peptide. In cultured cell experiments, shGALA-modification enhanced the endosomal escape of siRNA encapsulated in a polyethylene glycol modified MEND (PEG-MEND), resulting in an 82% knockdown of the target gene. In vivo systemic administration clarified that the shGALA-modified MEND (shGALA-MEND) showed 58% gene silencing in tumor tissues at a dose of 4 mg of siRNA/kg body weight. In addition, a significant inhibition of tumor growth was observed only for the shGALA-MEND and no somatic or hepatic toxicity was observed. Given the above data, this peptide-modified delivery system, a shGALA-MEND has great potential for the systemic delivery of therapeutic siRNA aimed at cancer therapy.

Original languageEnglish
Pages (from-to)5733-5742
Number of pages10
Issue number24
Publication statusPublished - 2011 Aug
Externally publishedYes


  • Liposome
  • Membrane fusion
  • Multi-functional envelop type nano device (MEND)
  • Peptide
  • SiRNA delivery

ASJC Scopus subject areas

  • Bioengineering
  • Ceramics and Composites
  • Biophysics
  • Biomaterials
  • Mechanics of Materials


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