Anionic amino acid-derived cationic lipid for siRNA delivery

Min Sung Suh, Gayong Shim, Han Young Lee, Su Eun Han, Yong Hee Yu, Yongseok Choi, Kwangmeyung Kim, Ick Chan Kwon, Kwon Yeon Weon, Young Bong Kim, Yu Kyoung Oh

Research output: Contribution to journalArticlepeer-review

48 Scopus citations


Viable siRNA therapeutic strategies require the concurrent development of effective and safe delivery systems. Here, we described the synthesis of a new cationic lipid, N,N″-dioleylglutamide (DG), and evaluated DG-based liposomes as an siRNA delivery system. DG, an amino acid derivative, was synthesized by peptide bond linkage of oleylamine to each carboxylic acid group of glutamic acid. Gel retardation assays showed that DG-based cationic liposomes and siRNA began to form complexes from the N/P ratio of 1.8. The viability of A549, HeLa and WM266.4 cells was significantly higher after treatment with DG-based liposomes than with Lipofectamine 2000 and cationic 3β-[N-(N′,N′-dimethylaminoethane)-carbamoyl] cholesterol (DC-Chol)-based liposomes. The DG-based cationic liposomes could effectively deliver a fluorescent model siRNA into A549, HeLa, and WM266.4 human cancer cell lines, showing at least 2-fold higher fluorescence mean intensity values than did Lipofectamine 2000. When survivin-specific siRNA was delivered to cells in lipoplexes, survivin mRNA levels were reduced by DG-based liposomes to the higher extent than Lipofectamine 2000 and DC-Chol-based liposomes. When red fluorescent protein (RFP)-expressing cells were treated with RFP-specific siRNA (siRFP), RFP expression significantly decreased in cells treated with DG-based liposomes. Molecular imaging revealed that intratumoral injection of siRFP and DG-based liposome complexes significantly reduced fluorescence in RFP-expressing tumor tissues in mice. These results suggest that DG-based cationic liposomes would be of value for cellular delivery and in vivo local delivery of siRNA.

Original languageEnglish
Pages (from-to)268-276
Number of pages9
JournalJournal of Controlled Release
Issue number3
StatePublished - 16 Dec 2009

Bibliographical note

Funding Information:
This study was financially supported by grants from the Ministry of Education, Science and Technology (F104AA010003-08A0101-00310), from the Basic Research Program of Korea Science and Engineering Foundation (KOSEF R01-2007-000-20475-0), and from Bio-Green 21 program (Code No. 20070501-034-001-009-03-00), Rural Development Administration, South Korea.


  • Cationic lipid
  • Gene reduction
  • Liposome
  • Viability
  • siRNA


Dive into the research topics of 'Anionic amino acid-derived cationic lipid for siRNA delivery'. Together they form a unique fingerprint.

Cite this