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Nanoparticle phagocytosis and cellular stress: involvement in cellular imaging and in gene therapy against glioma
Author(s) -
BouzierSore AnneKarine,
Ribot Emeline,
Bouchaud Véronique,
Miraux Sylvain,
Duguet Etienne,
Mornet Stéphane,
ClofentSanchez Gisèle,
Franconi JeanMichel,
Voisin Pierre
Publication year - 2010
Publication title -
nmr in biomedicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.278
H-Index - 114
eISSN - 1099-1492
pISSN - 0952-3480
DOI - 10.1002/nbm.1434
Subject(s) - microglia , internalization , genetic enhancement , in vivo , transfection , suicide gene , glioma , phagocytosis , cell therapy , gene delivery , microbiology and biotechnology , intracellular , chemistry , cancer research , cell , biology , gene , immunology , inflammation , biochemistry , stem cell
In gene therapy against glioma, targeting tumoral tissue is not an easy task. We used the tumor infiltrating property of microglia in this study. These cells are well adapted to this therapy since they can phagocyte nanoparticles and allow their visualization by MRI. Indeed, while many studies have used transfected microglia containing a suicide gene and other internalized nanoparticles to visualize microglia, none have combined both approaches during gene therapy. Microglia cells were transfected with the TK‐GFP gene under the control of the HSP 70 promoter. First, the possible cellular stress induced by nanoparticle internalization was checked to avoid a non‐specific activation of the suicide gene. Then, MR images were obtained on tubes containing microglia loaded with superparamagnetic nanoparticles (VUSPIO) to characterize their MR properties, as well as their potential to track cells in vivo . VUSPIO were efficiently internalized by microglia, were found non‐toxic and their internalization did not induce any cellular stress. VUSPIO relaxivity r 2 was 224 mM −1 .s −1 . Such results could generate a very high contrast between loaded and unloaded cells on T 2 ‐weighted images. The intracellular presence of VUSPIO does not prevent suicide gene activity, since TK is expressed in vitro and functional in vivo . It allows MRI detection of gene modified macrophages during cell therapy strategies. Copyright © 2009 John Wiley & Sons, Ltd.