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Lysosome mediates toxicological effects of polyethyleneimine-based cationic carbon dots

  • Carole Ronzani
  • Camille Van Belle
  • Pascal Didier
  • Coralie Spiegelhalter
  • Philippe Pierrat
  • Luc Lebeau
  • Françoise PonsEmail author
Research Paper
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Abstract

Cationic carbon dots (CDs) have been recently described as nucleic acid carriers with high in vitro and in vivo transfection efficiency and imaging properties. However, developing nanoparticles (NPs) for biomedical applications requires assessing their safety. In the present study, we characterized the cell uptake and trafficking, as well as the cell viability loss, oxidative stress, inflammation, and mitochondrial and lysosomal perturbations evoked by cationic CDs prepared by microwave-assisted pyrolysis of citric acid and high molecular weight branched polyethyleneimine (bPEI25k), using THP-1-derived macrophages. CDs were rapidly internalized by cells and addressed to the lysosomes after their cell entry. The NPs induced a dose- and time-dependent loss in cell viability that was associated with oxidative stress and IL-8 release. The CDs triggered also a dose-dependent loss in lysosome integrity, mitochondrial dysfunction, and NLRP3 inflammasome activation. Inhibition of the lysosomal protease cathepsin B significantly reduced CD-induced mitochondrial dysfunction and NLRP3 inflammasome activation, suggesting a pivotal role of the lysosome in the toxicological effects of the NPs. Our study provides for the first time a mechanistic pathway for the toxicological effects of bPEI25k-based cationic CDs.

Keywords

Nanoparticles Carbon dots Nanotoxicology Lysosome Oxidative stress Inflammation Health effects 

Notes

Acknowledgements

This work was supported by the agence nationale de sécurité sanitaire de l’alimentation, de l’environnement et du travail (ANSES - Grant n° EST-2015/1/005).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no conflict of interest.

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Copyright information

© Springer Nature B.V. 2018

Authors and Affiliations

  • Carole Ronzani
    • 1
  • Camille Van Belle
    • 1
  • Pascal Didier
    • 2
  • Coralie Spiegelhalter
    • 3
  • Philippe Pierrat
    • 1
  • Luc Lebeau
    • 1
  • Françoise Pons
    • 1
    Email author
  1. 1.Laboratoire de Conception et Application de Molécules Bioactives, UMR 7199, Faculté de PharmacieCNRS-Université de StrasbourgIllkirchFrance
  2. 2.Laboratoire de Bioimagerie et Pathologies, UMR 7021, Faculté de PharmacieCNRS-Université de StrasbourgIllkirchFrance
  3. 3.Centre d’ImagerieInstitut de Génétique et de Biologie Moléculaire et CellulaireIllkirchFrance

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