Izvorni znanstveni članak
Formyl-peptide Receptor Agonists and Amorphous SiO2-NPs Synergistically and Selectively Increase the Inflammatory Responses of Human Monocytes and PMNs
Regina Tavano
; Department of Biomedical Science, University of Padua, Padua, Italy
Daniela Segat
; Department of Biomedical Science, University of Padua, Padua, Italy; Present Address: Institute for Rare Diseases “M. Baschirotto “(BIRD), Costozza di Longare, Vicenza, Italy
Chiara Fedeli
; Department of Biomedical Science, University of Padua, Padua, Italy
Giulia Malachin
; Department of Biomedical Science, University of Padua, Padua, Italy
Elisa Lubian
; Department of Chemical Science, University of Padua, Padua, Italy
Fabrizio Mancin
; Department of Chemical Science, University of Padua, Padua, Italy
Emanuele Papini
; Department of Biomedical Science, University of Padua, Padua, Italy
Sažetak
We tested whether amorphous SiO2-NPs and formyl-peptide receptor (FPRs) agonists synergistically activate human monocytes and neutrophil polymorphonuclear granulocytes (PMNs). Peptide ligands specifically binding to FPR1 (f-MLP) and to FPR2 (MMK-1, WKYMVM and WKYMVm) human isoforms did not modify the association of SiO2-NPs to both cell types or their cytotoxic effects. Similarly, the extent of CD80, CD86, CD83, ICAM-1 and MHCII expression in monocytes treated with SiO2-NPs was not significantly altered by any FPRs agonist. However, FPR1 stimulation with f-MLP strongly increased the secretion of IL-1β, IL-6 and IL-8 by human monocytes, and of IL-8 by PMNs in the presence of SiO2-NPs, due to the synergic stimulation of gene transcription. FPR2 agonists also up-modulated the production of IL-1β induced by monocytes treated with SiO2-NPs. In turn, SiO2-NPs increased the chemotaxis of PMNs toward FPR1-specific ligands, but not toward FPR2-specific ones. Conversely, the chemotaxis of monocytes toward FPR2-specific peptides was inhibited by SiO2-NPs. NADPH-oxidase activation triggered by FPR1- and FPR2-specific ligands in both cell types was not altered by SiO2-NPs. Microbial and tissue danger signals sensed by FPRs selectively amplified the functional responses of monocytes and PMNS to SiO2-NPs, and should be carefully considered in the assessment of the risk associated with nanoparticle exposure.
Ključne riječi
Silica Nanoparticles; Monocytes; PMNs; Formyl Peptide Receptors; Immunomodulation
Hrčak ID:
157695
URI
Datum izdavanja:
1.1.2016.
Posjeta: 912 *