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Cytotechnology

, Volume 70, Issue 6, pp 1655–1669 | Cite as

Biologically produced silver chloride nanoparticles from B. megaterium modulate interleukin secretion by human adipose stem cell spheroids

  • Letícia E. Charelli
  • Nathalia Müller
  • Karina R. Silva
  • Luís Maurício T. R. Lima
  • Celso Sant’Anna
  • Leandra S. BaptistaEmail author
Original Article
  • 121 Downloads

Abstract

Stem cell tissue constructs are likely to come into contact with silver-based nanoparticles—such as silver chloride nanoparticles (AgCl–NPs)—used as microbicidals at the implant site or in cosmetics. However, the effect of silver-based nanoparticles on 3D cell cultures with potential for tissue engineering has received little attention. Here, we examined the effect of sub-lethal doses (5, 10 and 25 µg/mL, for 1, 7 and 21 days) of AgCl–NPs produced by ‘green’ bacterial-based synthesis on spheroid 3D cultures of human adipose tissue stem cells (ASCs). Light microscopy analysis revealed that the shape and diameter of ASC spheroids remained largely unchanged after AgCl–NP treatment. Flow cytometry analysis with 7-AAD and 2′,7′-dichlorofluorescein diacetate revealed no statistically significant differences in cell death but showed an increase of ROS levels for the untreated group and significant differences for the groups treated with 5 and 10 µg/mL at day 7 (p = 0.0395, p = 0.0266, respectively). Electron microscopy analysis showed limited cell damage in the periphery of AgCl–NP-treated spheroids. However, treatment with AgCl–NP had statistically significant effects on the secretion of IL-6, IL-8, IL-1β and IL-10 by spheroids, at specific treatment periods and concentrations, and particularly for IL-6, IL-8 and IL-1β. TGF-β1 and -β2 secretion also changed significantly throughout the treatment period. Our results indicate that, despite having little effect on cell viability and morphology, sub-lethal AgCL–NP doses modulate ROS production at day 7 for the groups treated with 5 and 10 µg/mL and also modulate the secretory profile of ASC spheroids. Thus, the use of skin implants or products containing Ag-NPs may promote long-term disturbances in subcutaneous adipose tissue homeostasis.

Keywords

Spheroids Silver chloride nanoparticles Adipose stem cells 3D culture Interleukin secretion 

Notes

Acknowledgements

This study was supported by the Foundation for Research Support of the State of Rio de Janeiro (FAPERJ, Brazil). We thank the National Institute of Metrology, Quality and Technology (INMETRO, RJ, Brazil) and the Nucleus of Multidisciplinary Research in Biology (Numpex-Bio, Federal University of Rio de Janeiro, RJ, Brazil) for the use of their facilities. The authors also would like to thank the Coordination for the Improvement of Higher Education Personnel (CAPES, Brazil) and the Financier of Studies and Projects (FINEP, Brazil).

Compliance with ethical standards

Conflict of interest

The authors report no conflict of interest.

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© Springer Nature B.V. 2018

Authors and Affiliations

  1. 1.Post-graduation Program in Biotechnology, National Institute of MetrologyQuality and Technology (Inmetro)Duque de CaxiasBrazil
  2. 2.Laboratory of Tissue Bioengineering, National Institute of MetrologyQuality and Technology (Inmetro)Duque de CaxiasBrazil
  3. 3.Nucleus of Multidisciplinary Research in Biology (Numpex-Bio)Federal University of Rio de Janeiro-Xerém (UFRJ – Xerém)Duque de CaxiasBrazil
  4. 4.Laboratory of Microscopy Applied to Life Science (Lamav), National Institute of MetrologyQuality and Technology (Inmetro)Duque de CaxiasBrazil
  5. 5.Laboratory of Pharmaceutical BiotechnologyFederal University of Rio de Janeiro (UFRJ)Rio de JaneiroBrazil

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