Uptake of Functionalized Mesoporous Silica Nanoparticles by Human Cancer Cells

Abstract : Mesoporous silica nanoparticles (MSN) were functionalised by aminofluorescein (AMF) with diethylenetriaminepentaacetic acid spacer molecules which provide free carboxylic groups for binding cell-specific ligands such as folate. AMF allowed the exploration of cellular uptake by HeLa cells using confocal microscopy and flow cytometry. The functionalized nanoparticles (MSN-AMF) penetrated efficiently into HeLa cell cytoplasm through a clathrin dependent endocytosis mechanism. The number of endocytosed MSN-AMF was enhanced when using folate as a targeting molecule. Uptake kinetics revealed that most of MSN-AMF were internalized within 4 h of incubation. Moreover, we found that MSN-AMF were capable of escaping the acidic endolysosomal vesicles of HeLa cells. Cytotoxicity studies suggested that these nanoparticles are non-toxic to HeLa cells up to a dose level of 50 mu g/ml.
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Submitted on : Monday, October 25, 2010 - 2:17:10 PM
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Matthieu Fisichella, Hinda Dabboue, Sanjib Bhattacharyya, Gerald Lelong, Marie-Louise Saboungi, et al.. Uptake of Functionalized Mesoporous Silica Nanoparticles by Human Cancer Cells. Journal of Nanoscience and Nanotechnology, American Scientific Publishers, 2010, 10 (4), pp.314-2324. ⟨10.1166/jnn.2010.1917⟩. ⟨hal-00529333⟩



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