Fe-based materials are considered for the manufacture of temporary implants that degrade through the corrosion of Fe by oxygen. Here we document the generation of hydroxyl radicals (HO[rad]) during this corrosion process, and their deleterious impacts on human endothelial (ECs) and smooth muscle cells (SMCs) in vitro. The generation of HO[rad] was documented by two independent acellular assays, terephtalic acid hydroxylation (fluorescence) and spin trapping technique coupled with electron paramagnetic resonance spectroscopy. All Fe-based materials tested exhibited a strong potential to generate HO[rad]. The addition of catalase prevented the formation of HO[rad]. Cellular responses were assessed in two ECs and SMCs lines using different cytotoxicity assays (WST-1 and CellTiter-Glo). Cells were exposed directly to Fe powder in the presence/absence of catalase, or to extracts obtained from the corrosion of Fe. Cell viability was dose-dependently affected by the direct contact with Fe materials, but not in the presence of catalase or after indirect exposure to cell extracts. The deleterious effect of HO[rad] on ECs and SMCs was confirmed by the dose-dependent increase of the transcripts of the oxidative stress gene heme oxygenase-1 4 h or 6 h after direct exposure to the particles, but not in presence of catalase or after indirect exposure. The demonstration of HO[rad] production during corrosion and consequent oxidative stress on human ECs and SMCs newly reveals a deleterious consequence of Fe-corrosion that should be integrated in the assessment of the biocompatibility of Fe-based alloys.
Hydroxyl radicals and oxidative stress: the dark side of Fe corrosion
Tomatis M.;Turci F.;
2020-01-01
Abstract
Fe-based materials are considered for the manufacture of temporary implants that degrade through the corrosion of Fe by oxygen. Here we document the generation of hydroxyl radicals (HO[rad]) during this corrosion process, and their deleterious impacts on human endothelial (ECs) and smooth muscle cells (SMCs) in vitro. The generation of HO[rad] was documented by two independent acellular assays, terephtalic acid hydroxylation (fluorescence) and spin trapping technique coupled with electron paramagnetic resonance spectroscopy. All Fe-based materials tested exhibited a strong potential to generate HO[rad]. The addition of catalase prevented the formation of HO[rad]. Cellular responses were assessed in two ECs and SMCs lines using different cytotoxicity assays (WST-1 and CellTiter-Glo). Cells were exposed directly to Fe powder in the presence/absence of catalase, or to extracts obtained from the corrosion of Fe. Cell viability was dose-dependently affected by the direct contact with Fe materials, but not in the presence of catalase or after indirect exposure to cell extracts. The deleterious effect of HO[rad] on ECs and SMCs was confirmed by the dose-dependent increase of the transcripts of the oxidative stress gene heme oxygenase-1 4 h or 6 h after direct exposure to the particles, but not in presence of catalase or after indirect exposure. The demonstration of HO[rad] production during corrosion and consequent oxidative stress on human ECs and SMCs newly reveals a deleterious consequence of Fe-corrosion that should be integrated in the assessment of the biocompatibility of Fe-based alloys.File | Dimensione | Formato | |
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2020 Scarcello - Coll. Surf. B.pdf
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Reactive oxygen species, the hidden face of biodegradable Fe-based alloys.pdf
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Descrizione: Scarcello et al., 2020 - open access
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