Hybrid lipid-polymer nanoparticles for sustained siRNA delivery and gene silencing

Jinjun Shi, Yingjie Xu, Xiaoyang Xu, Xi Zhu, Eric Pridgen, Jun Wu, Alexander R. Votruba, Archana Swami, Bruce R. Zetter, Omid C. Farokhzad

Research output: Contribution to journalArticlepeer-review

80 Scopus citations


The development of controlled-release nanoparticle (NP) technologies has great potential to further improve the therapeutic efficacy of RNA interference (RNAi), by prolonging the release of small interfering RNA (siRNA) for sustained, long-term gene silencing. Herein, we present an NP platform with sustained siRNA-release properties, which can be self-assembled using biodegradable and biocompatible polymers and lipids. The hybrid lipid-polymer NPs showed excellent silencing efficacy, and the temporal release of siRNA from the NPs continued for over one month. When tested on luciferase-expressed HeLa cells and A549 lung carcinoma cells after short-term transfection, the siRNA NPs showed greater sustained silencing activity than lipofectamine 2000-siRNA complexes. More importantly, the NP-mediated sustained silencing of prohibitin 1 (PHB1) generates more effective tumor cell growth inhibition in vitro and in vivo than the lipofectamine complexes. We expect that this sustained-release siRNA NP platform could be of interest in both fundamental biological studies and clinical applications. From the Clinical Editor: Emerging gene silencing applications could be greatly enhanced by prolonging the release of siRNA for sustained gene silencing. This team of scientists presents a hybrid lipid-polymer nanoparticle platform that successfully accomplishes this goal, paving the way to future research studies and potential clinical applications.

Original languageEnglish (US)
Pages (from-to)e897-e900
JournalNanomedicine: Nanotechnology, Biology, and Medicine
Issue number5
StatePublished - Jul 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Medicine (miscellaneous)
  • Molecular Medicine
  • Biomedical Engineering
  • General Materials Science
  • Pharmaceutical Science


  • Cancer
  • Gene silencing
  • Lipid-polymer nanoparticle
  • SiRNA
  • Sustained release


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