Details

Autor(en) / Beteiligte

• Feray, Alexia
• Guillet, Éléonore
• Szely, Natacha
• Hullo, Marie
• Legrand, François-Xavier
• Brun, Emilie
• Rabilloud, Thierry
• Pallardy, Marc
• Biola-Vidamment, Armelle

Titel

Synthetic Amorphous Silica Nanoparticles Promote Human Dendritic Cell Maturation and CD4+ T-Lymphocyte Activation

Ist Teil von

• Toxicological Sciences, 2021-12, Vol.185 (1), p.105-116

Ort / Verlag

United States: Oxford University Press

Erscheinungsjahr

2021

Link zum Volltext

Quelle

Oxford Journals 2020 Medicine

Beschreibungen/Notizen

• Abstract Innate immune cells such as dendritic cells (DCs) sense and engulf nanomaterials potentially leading to an adverse immune response. Indeed, as described for combustion-derived particles, nanomaterials could be sensed as danger signals, enabling DCs to undergo a maturation process, migrate to regional lymph nodes and activate naive T lymphocytes. Synthetic amorphous silica nanoparticles (SAS-NPs) are widely used as food additives, cosmetics, and construction materials. This work aimed to evaluate in vitro the effects of manufactured SAS-NPs, produced by thermal or wet routes, on human DCs functions and T-cell activation. Human monocyte-derived DCs (moDCs) were exposed for 16 h to 3 endotoxin-free test materials: fumed silica NPs from Sigma-Aldrich (no. S5505) or the JRC Nanomaterial Repository (NM-202) and colloidal LudoxTMA NPs. Cell viability, phenotypical changes, cytokines production, internalization, and allogeneic CD4+ T-cells proliferation were evaluated. Our results showed that all SAS-NPs significantly upregulated the surface expression of CD86 and CD83 activation markers. Secretions of pro-inflammatory cytokines (CXCL-8 and CXCL-12) were significantly enhanced in a dose-dependent manner in the moDCs culture supernatants by all SAS-NPs tested. In an allogeneic coculture, fumed silica-activated moDCs significantly increased T-lymphocyte proliferation at all T-cell: DC ratios compared with unloaded moDCs. Moreover, analysis of coculture supernatants regarding the production of T-cell-derived cytokines showed a significant increase of IL-9 and IL-17A and F, as well as an upregulation of IL-5, consistent with the pro-inflammatory phenotype of treated moDCs. Taken together, these results suggest that SAS-NPs could induce functional moDCs maturation and play a role in the immunization process against environmental antigens.