Hierarchical Assembly of siRNA with Tetraamino Fullerene in Physiological Conditions for Efficient Internalization into Cells and Knockdown

Kosuke Minami, Koji Okamoto, Koji Harano, Eisei Noiri, Eiichi Nakamura

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Delivery of siRNA is a key technique in alternative gene therapy, where the siRNA cargo must be effectively loaded onto a tailor-designed carrier molecule and smoothly unloaded precisely upon arrival at the target cells or organs. Any toxicity issues also need to be mitigated by suitable choice of the carrier molecule. A water-soluble cationic fullerene, tetra(piperazino)[60]fullerene epoxide (TPFE), was previously shown to be nontoxic and effective for lung-targeted in vivo siRNA delivery by way of agglutination-induced accumulation. We found in this in vitro study that hierarchical reversible assembly of micrometer-sized TPFE-siRNA-serum protein ternary complexes is the key element for effective loading and release, and stabilization of otherwise highly unstable siRNA under the physiological conditions. The amphiphilic TPFE molecule forms a sub-10 nm-sized stable micelle because of strong cohesion between fullerene molecules, and this fullerene aggregate protects siRNA and induces the hierarchical assembly. Unlike popularly used polyamine carriers, TPFE is not toxic at the dose used for the siRNA delivery.

Original languageEnglish
Pages (from-to)19347-19354
Number of pages8
JournalACS Applied Materials and Interfaces
Volume10
Issue number23
DOIs
Publication statusPublished - 2018 Jun 13
Externally publishedYes

Keywords

  • cell internalization
  • fullerene
  • gene delivery
  • hierarchical assembly
  • nanomedicine
  • siRNA

ASJC Scopus subject areas

  • Materials Science(all)

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