Polyethyleneimine-functionalized iron oxide nanoparticles for systemic siRNA delivery in experimental arthritis.
Nanomedicine (Lond) 2014;
9:789-801. [PMID:
24392891 DOI:
10.2217/nnm.13.217]
[Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
AIMS
This study aimed to examine the efficacy of a nanocarrier (polyethyleneimine [PEI]-superparamagnetic iron oxide nanoparticle [SPIO]), composed of a core of iron oxide and a shell of PEI, in the systemic delivery of therapeutic siRNA to experimental arthritic joints.
MATERIALS & METHODS
PEI-SPIO/siRNA nanoparticles were synthesized and characterized in vitro. Nanoparticles were administered intravenously to arthritic rats to analyze cellular uptake, tissue distribution and the therapeutic effect of a siRNA against the IL-2/-15 receptor β chain (IL-2/IL-15Rβ).
RESULTS
PEI-SPIOs loaded with siRNA displayed negligible cytotoxicity, improved siRNA stability, efficient uptake by macrophages and the ability to induce specific gene silencing in vitro. PEI-SPIO-delivered siRNA accumulated easily in inflamed joints and was efficiently taken up by joint macrophages and T cells. Although IL-2/IL-15Rβ siRNA-loaded PEI-SPIOs alone were efficacious in the treatment of experimental arthritis, combination therapy with both PEI-SPIO/IL-2/IL-15Rβ siRNA and a magnetic field displayed an additive anti-inflammatory effect.
CONCLUSION
PEI-functionalized SPIOs can be employed for systemic siRNA delivery in rheumatoid arthritis and enhanced therapeutic benefit can be achieved by the use of an external magnetic field.
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