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Effect of serum proteins on polystyrene nanoparticle uptake and intracellular trafficking in endothelial cells

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Abstract

The physico-chemical properties of nanoparticles (NPs), such as small dimensions, surface charge and surface functionalization, control their capability to interact with cells and, in particular, with sub-cellular components. This interaction can be also influenced by the adsorption of molecules present in biological fluids, like blood, on NP surface. Here, we analysed the effect of serum proteins on 49 and 100 nm red fluorescent polystyrene NP uptake in porcine aortic endothelial (PAE) cells, as a model for vascular transport. To this aim, NP uptake kinetic, endocytic pathway and intracellular trafficking were studied by monitoring NPs inside cells through confocal microscopy and multiple particle tracking (MPT). We demonstrated that NPs are rapidly internalized by cells in serum-free (SF) medium, according to a saturation kinetic. Conversely, in 10% foetal bovine serum-enriched (SE) medium, NP uptake rate results drastically reduced. Moreover, NP internalization depends on an active endocytic mechanism that does not involve clathrin- and caveolae-mediated vesicular transport, in both SE and SF media. Furthermore, MPT data indicate that NP intracellular trafficking is unaffected by protein presence. Indeed, approximately 50–60% of internalized NPs is characterized by a sub-diffusive behaviour, whereas the remaining fraction shows an active motion. These findings demonstrate that the unspecific protein adsorption on NP surface can affect cellular uptake in terms of internalization kinetics, but it is not effective in controlling active and cellular-mediated uptake mechanisms of NPs and their intracellular routes.

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Authors and Affiliations

  1. Center for Advanced Biomaterials for Health Care @CRIB, Istituto Italiano di Tecnologia, P.le Tecchio, 80, 80125, Naples, Italy

    Daniela Guarnieri, Angela Guaccio, Sabato Fusco & Paolo A. Netti

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  1. Daniela Guarnieri
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  2. Angela Guaccio
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  3. Sabato Fusco
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  4. Paolo A. Netti
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Correspondence to Paolo A. Netti.

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The first three authors contributed equally to this work.

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Guarnieri, D., Guaccio, A., Fusco, S. et al. Effect of serum proteins on polystyrene nanoparticle uptake and intracellular trafficking in endothelial cells. J Nanopart Res 13, 4295–4309 (2011). https://doi.org/10.1007/s11051-011-0375-2

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