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Internalization and fate of silica nanoparticles in C2C12 skeletal muscle cells: evidence of a beneficial effect on myoblast fusion

Authors Poussard S, Decossas M, Le Bihan O, Mornet S, Naudin G, Lambert O

Received 11 September 2014

Accepted for publication 9 November 2014

Published 19 February 2015 Volume 2015:10(1) Pages 1479—1492

DOI https://doi.org/10.2147/IJN.S74158

Checked for plagiarism Yes

Review by Single-blind

Peer reviewer comments 5

Editor who approved publication: Dr Thomas J Webster

Sylvie Poussard,1,2 Marion Decossas,1,2 Olivier Le Bihan,1,2 Stéphane Mornet,3 Grégoire Naudin,1,2 Olivier Lambert1,2

1Institute of Chemistry and Biology of Membranes and Nanoobjects, University of Bordeaux, UMR5248, Pessac, France; 2Institute of Chemistry and Biology of Membranes and Nanoobjects, Centre National de la Recherche Scientifique, Institute of Chemistry and Biology of Membranes and Nanoobjects, UMR5248, Pessac, France; 3ICMCB, Institut de Chimie de la Matière Condensée de Bordeaux, CNRS UPR9048, Université de Bordeaux, Pessac, France

Abstract: The use of silica nanoparticles for their cellular uptake capability opens up new fields in biomedical research. Among the toxicological effects associated with their internalization, silica nanoparticles induce apoptosis that has been recently reported as a biochemical cue required for muscle regeneration. To assess whether silica nanoparticles could affect muscle regeneration, we used the C2C12 muscle cell line to study the uptake of fluorescently labeled NPs and their cellular trafficking over a long period. Using inhibitors of endocytosis, we determined that the NP uptake was an energy-dependent process mainly involving macropinocytosis and clathrin-mediated pathway. NPs were eventually clustered in lysosomal structures. Myoblasts containing NPs were capable of differentiation into myotubes, and after 7 days, electron microscopy revealed that the NPs remained primarily within lysosomes. The presence of NPs stimulated the formation of myotubes in a dose-dependent manner. NP internalization induced an increase of apoptotic myoblasts required for myoblast fusion. At noncytotoxic doses, the NP uptake by skeletal muscle cells did not prevent their differentiation into myotubes but, instead, enhanced the cell fusion.

Keywords: silica, nanoparticle, muscle, cell encapsulation, transmission electron microscopy, apoptosis

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