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Article Dans Une Revue NMR in Biomedicine Année : 2010

Nanoparticle phagocytosis and cellular stress: involvement in cellular imaging and in gene therapy against glioma.

Résumé

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.

Dates et versions

hal-00466418 , version 1 (23-03-2010)

Identifiants

Citer

Anne-Karine Bouzier-Sore, Emeline Ribot, Véronique Bouchaud, Sylvain Miraux, Etienne Duguet, et al.. Nanoparticle phagocytosis and cellular stress: involvement in cellular imaging and in gene therapy against glioma.. NMR in Biomedicine, 2010, 23 (1), pp.88-96. ⟨10.1002/nbm.1434⟩. ⟨hal-00466418⟩
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