ABSTRACT
Purpose
To optimize silica-iron oxide magnetic nanoparticles with surface phosphonate groups decorated with 25-kD branched polyethylenimine (PEI) for gene delivery.
Methods
Surface composition, charge, colloidal stabilities, associations with adenovirus, magneto-tranduction efficiencies, cell internalizations, in vitro toxicities and MRI relaxivities were tested for the particles decorated with varying amounts of PEI.
Results
Moderate PEI-decoration of MNPs results in charge reversal and destabilization. Analysis of space and time resolved concentration changes during centrifugation clearly revealed that at >5% PEI loading flocculation gradually decreases and sufficient stabilization is achieved at >10%. The association with adenovirus occurred efficiently at levels over 5% PEI, resulting in the complexes stable in 50% FCS at a PEI-to-iron w/w ratio of ≥7%; the maximum magneto-transduction efficiency was achieved at 9–12% PEI. Primary silica iron oxide nanoparticles and those with 11.5% PEI demonstrated excellent r2* relaxivity values (>600 s−1(mM Fe)−1) for the free and cell-internalized particles.
Conclusions
Surface decoration of the silica-iron oxide nanoparticles with a PEI-to-iron w/w ratio of 10-12% yields stable aqueous suspensions, allows for efficient viral gene delivery and labeled cell detection by MRI.
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Abbreviations
- ATCC:
-
American Type Culture Collection
- DMEM:
-
Dulbecco’s modified Eagle’s medium
- EDTA:
-
Ethylenediaminetetraacetic acid
- FCS:
-
fetal calf serum
- ME-FFE:
-
multi-echo gradient echo
- MNP:
-
magnetic nanoparticles
- mPDAC:
-
mouse pancreatic ductal adenocarcinoma
- MRI:
-
magnetic resonance imaging
- PBS:
-
Dulbecco’s phosphate buffered saline
- PEI:
-
polyethylenimine
- SIO-MNP:
-
silica-iron oxide magnetic nanoparticle
- SiOx :
-
silica-like coating of the iron oxide nanoparticles
- TEM:
-
Transmission Electron Microscopy
- TEOS:
-
tetraethyl orthosilicate
- THPMP:
-
3-(trihydroxysilyl) propylmethylphosphonate
- TU:
-
transducing units
- VP:
-
virus particle
- XPS:
-
X-ray photoelectron spectroscopy
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Mykhaylyk, O., Sobisch, T., Almstätter, I. et al. Silica-Iron Oxide Magnetic Nanoparticles Modified for Gene Delivery: A Search for Optimum and Quantitative Criteria. Pharm Res 29, 1344–1365 (2012). https://doi.org/10.1007/s11095-011-0661-9
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DOI: https://doi.org/10.1007/s11095-011-0661-9