Delivery of small interfering RNA with a synthetic collagen poly(Pro-Hyp-Gly) for gene silencing in vitro and in vivo

Taro Adachi, Emi Kawakami, Naozumi Ishimaru, Takahiro Ochiya, Yoshio Hayashi, Hideyo Ohuchi, Masao Tanihara, Eiji Tanaka, Sumihare Noji

Research output: Contribution to journalArticle

7 Citations (Scopus)


Silencing gene expression by small interfering RNAs (siRNAs) has become a powerful tool for the genetic analysis of many animals. However, the rapid degradation of siRNA and the limited duration of its action in vivo have called for an efficient delivery technology. Here, we describe that siRNA complexed with a synthetic collagen poly(Pro-Hyp-Gly) (SYCOL) is resistant to nucleases and is efficiently transferred into cells in vitro and in vivo, thereby allowing long-term gene silencing in vivo. We found that the SYCOL-mediated local application of siRNA targeting myostatin, coding a negative regulator of skeletal muscle growth, in mouse skeletal muscles, caused a marked increase in the muscle mass within a few weeks after application. Furthermore, in vivo administration of an anti-luciferase siRNASYCOL complex partially reduced luciferase expression in xenografted tumors in vivo. These results indicate a SYCOL-based non-viral delivery method could be a reliable simple approach to knockdown gene expression by RNAi in vivo as well as in vitro.

Original languageEnglish
Pages (from-to)693-699
Number of pages7
JournalDevelopment Growth and Differentiation
Issue number8
Publication statusPublished - Oct 1 2010
Externally publishedYes



  • RNAi
  • delivery
  • myostatin
  • siRNA
  • synthetic collagen

ASJC Scopus subject areas

  • Developmental Biology
  • Cell Biology

Cite this