Cancer-targeted MDR-1 siRNA delivery using self-cross-linked glycol chitosan nanoparticles to overcome drug resistance

Ji Young Yhee, Seungyong Song, So Jin Lee, Sung Gurl Park, Ki Suk Kim, Myung Goo Kim, Sejin Son, Heebeom Koo, Ick Chan Kwon, Ji Hoon Jeong, Seo Young Jeong, Sun Hwa Kim, Kwangmeyung Kim

Research output: Contribution to journalArticlepeer-review

121 Scopus citations


P-glycoprotein (Pgp) mediated multi-drug resistance (MDR) is a major cause of failure in chemotherapy. In this study, small interfering RNA (siRNA) for Pgp down-regulation was delivered to tumors to overcome MDR in cancer. To achieve an efficient siRNA delivery in vivo, self-polymerized 5′-end thiol-modified siRNA (poly-siRNA) was incorporated in tumor targeting glycol chitosan nanoparticles. Pgp-targeted poly-siRNA (psi-Pgp) and thiolated glycol chitosan polymers (tGC) formed stable nanoparticles (psi-Pgp-tGC NPs), and the resulting nanoparticles protected siRNA molecules from enzymatic degradation. The psi-Pgp-tGC NPs could release functional siRNA molecules after cellular delivery, and they were able to facilitate siRNA delivery to Adriamycin-resistant breast cancer cells (MCF-7/ADR). After intravenous administration, the psi-Pgp-tGC NPs accumulated in MCF-7/ADR tumors and down-regulated P-gp expression to sensitize cancer cells. Consequently, chemo-siRNA combination therapy significantly inhibited tumor growth without systemic toxicity. These psi-Pgp-tGC NPs showed great potential as a supplementary therapeutic agent for drug-resistant cancer.

Original languageEnglish (US)
Pages (from-to)1-9
Number of pages9
JournalJournal of Controlled Release
StatePublished - Jan 28 2015

Bibliographical note

Funding Information:
This study was supported by the National Research Foundation of Korea ( NRF-2013K1A1A2A02050115 and 2010-0027955 ) and Development and commercialization of molecular diagnostic technologies for lung cancer through clinical validation ( 1004393 ) by the MOTIE, Korea .

Publisher Copyright:
© 2014 Elsevier B.V. All rights reserved.


  • Glycol chitosan
  • Multi-drug resistance
  • Nanoparticles
  • Polymerized siRNA
  • siRNA delivery


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