Inhibition of ABCB1 (MDR1) expression by an siRNA nanoparticulate delivery system to overcome drug resistance in osteosarcoma

Title:
Inhibition of ABCB1 (MDR1) expression by an siRNA nanoparticulate delivery system to overcome drug resistance in osteosarcoma
Creator:
Susa, Michiro (Author)
Iyer, Arun K. (Author)
Ryu, Keinosuke (Author)
Choi, Edwin (Author)
Hornicek, Francis John (Author)
Mankin, Henry J. (Author)
Milane, Lara (Author)
Amiji, Mansoor M. (Author)
Duan, Zhenfeng (Author)
Language:
English
Publisher:
Plos One
Copyright date:
2010
Type of resource:
Text
Genre:
Articles
Format:
electronic
Digital origin:
born digital
Abstract/Description:
Background: The use of neo-adjuvant chemotherapy in treating osteosarcoma has improved patients' average 5 year survival rate from 20% to 70% in the past 30 years. However, for patients who progress after chemotherapy, its effectiveness diminishes due to the emergence of multi-drug resistance (MDR) after prolonged therapy.
Methodology/Principal Findings: In order to overcome both the dose-limiting side effects of conventional chemotherapeutic agents and the therapeutic failure resulting from MDR, we designed and evaluated a novel drug delivery system for MDR1 siRNA delivery. Novel biocompatible, lipid-modified dextran-based polymeric nanoparticles were used as the platform for MDR1 siRNA delivery; and the efficacy of combination therapy with this system was evaluated. In this study, multi-drug resistant osteosarcoma cell lines (KHOSR2 and U-2OSR2) were treated with the MDR1 siRNA nanocarriers and MDR1 protein (P-gp) expression, drug retention, and immunofluoresence were analyzed. Combination therapy of the MDR1 siRNA loaded nanocarriers with increasing concentrations of doxorubicin was also analyzed. We observed that MDR1 siRNA loaded dextran nanoparticles efficiently suppresses P-gp expression in the drug resistant osteosarcoma cell lines. The results also demonstrated that this approach may be capable of reversing drug resistance by increasing the amount of drug accumulation in MDR cell lines.
Conclusions/Significance: Lipid-modified dextran-based polymeric nanoparticles are a promising platform for siRNA delivery. Nanocarriers loaded with MDR1 siRNA are a potential treatment strategy for reversing MDR in osteosarcoma.
Comments:
Originally published in PLoS ONE 5(5): e10764. doi:10.1371/journal.pone.0010764
Subjects and keywords:
Drug delivery systesm
Osteosarcoma
Drug resistance in cancer cells
drug resistance
osteosarcoma
bone cancer
doxorubicin
polymeric nanoparticles
Oncology
Pharmaceutics and Drug Design
Permanent Link:
http://hdl.handle.net/2047/d20000292

Downloads