Cytotoxicity of cadmium-containing silica nanoparticles Cd-SiO2NPs (0.05–100 g/mL) versus SiO2NPs and CdCl2 was evaluated by an in vitro test battery in A549 by assessing (i) mitochondrial function, (ii) membrane integrity/cell morphology, (iii) cell growth/proliferation, (iv) apoptotic pathway, (v) oxidative stress, after short- (24–48h) and long-term(10 days) exposure.BothCd- SiO2NPs and CdCl2 produced dose-dependent cytotoxic effects: (i)MTT-assay: similar cytotoxicity pattern was observed at both 24 and 48h, with a more Cd-SiO2NPs pronounced effect than CdCl2. Cd-SiO2NPs induced mortality (about 50%) at 1 g/mL, CdCl2 at 25 g/mL; (ii) calcein-AM/PI staining: decrease in cell viability, noticeable at 25 g/mL, enhanced markedly at 50 and 100 g/mL, after 24 h. Cd-SiO2NPs induced higher mortality than CdCl2 (25% versus 4%, resp., at 25 g/mL) with further exacerbation after 48h; (iii) clonogenic assay: exposure for longer period (10 days) compromised the A549 proliferative capacity at very low dose (0.05 g/mL); (iv) a progressive activation of caspase-3 immunolabelling was detected already at 1 g/mL; (v) GSHintracellular level wasmodified by all compounds. In summary, in vitro data demonstrated that both Cd-SiO2NPs and CdCl2 affected all investigated endpoints, more markedly after Cd-SiO2NPs, while SiO2NPs influenced GSH only.

In Vitro Toxicity Evaluation of Engineered Cadmium-Coated Silica Nanoparticles on Human Pulmonary Cells

MANZO, LUIGI;PROFUMO, ANTONELLA;
2013-01-01

Abstract

Cytotoxicity of cadmium-containing silica nanoparticles Cd-SiO2NPs (0.05–100 g/mL) versus SiO2NPs and CdCl2 was evaluated by an in vitro test battery in A549 by assessing (i) mitochondrial function, (ii) membrane integrity/cell morphology, (iii) cell growth/proliferation, (iv) apoptotic pathway, (v) oxidative stress, after short- (24–48h) and long-term(10 days) exposure.BothCd- SiO2NPs and CdCl2 produced dose-dependent cytotoxic effects: (i)MTT-assay: similar cytotoxicity pattern was observed at both 24 and 48h, with a more Cd-SiO2NPs pronounced effect than CdCl2. Cd-SiO2NPs induced mortality (about 50%) at 1 g/mL, CdCl2 at 25 g/mL; (ii) calcein-AM/PI staining: decrease in cell viability, noticeable at 25 g/mL, enhanced markedly at 50 and 100 g/mL, after 24 h. Cd-SiO2NPs induced higher mortality than CdCl2 (25% versus 4%, resp., at 25 g/mL) with further exacerbation after 48h; (iii) clonogenic assay: exposure for longer period (10 days) compromised the A549 proliferative capacity at very low dose (0.05 g/mL); (iv) a progressive activation of caspase-3 immunolabelling was detected already at 1 g/mL; (v) GSHintracellular level wasmodified by all compounds. In summary, in vitro data demonstrated that both Cd-SiO2NPs and CdCl2 affected all investigated endpoints, more markedly after Cd-SiO2NPs, while SiO2NPs influenced GSH only.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11571/983056
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