Impact of Polyethylenimine Conjugation Mode on the Cell Transfection Efficiency of Silica Nanovectors

The conjugation of polyethylenimine (PEI) to silica nanoparticles has emerged as a useful strategy in gene delivery. Here we investigate the influence of the PEI conjugation mode on the transfection ability of plain silica nanoparticles. Surface functionalization with sulfonate- and chloride-bearing...

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Bibliographic Details
Published in:Langmuir 2015-10, Vol.31 (40), p.11078-11085
Main Authors: Wang, Xiaolin, Masse, Sylvie, Laurent, Guillaume, Hélary, Christophe, Coradin, Thibaud
Format: Article
Language:English
Subjects:
3T3 Cells
Animals
Cells, Cultured
Chemical Sciences
Electrophoresis, Agar Gel
Genetic Vectors
Humans
Material chemistry
Medicinal Chemistry
Mice
Microscopy, Fluorescence
Polyethyleneimine - chemistry
Silicon Dioxide - chemistry
Transfection
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Summary:The conjugation of polyethylenimine (PEI) to silica nanoparticles has emerged as a useful strategy in gene delivery. Here we investigate the influence of the PEI conjugation mode on the transfection ability of plain silica nanoparticles. Surface functionalization with sulfonate- and chloride-bearing silanes modulates the amount and conformation of PEI and therefore the particles’ affinity for the plasmid, without impacting on cytotoxicity. However, transfection efficiency in both immortalized and primary cells is more directly correlated to the nature and strength of the particle–PEI interactions. It suggests that PEI detachment from the particle surface at the stage of endosomal escape is a key event in the plasmid delivery process. These data should provide fruitful guidelines for the fine tuning of colloidal surfaces intended for intracellular delivery of bioactive molecules.
ISSN:0743-7463
1520-5827
DOI:10.1021/acs.langmuir.5b02616