Efficient inorganic UV shields, mostly based on refracting TiO<inf>2</inf> particles, have dramatically changed the sun exposure habits. Unfortunately, health concerns have emerged from the pro-oxidant photocatalytic effect of UV-irradiated TiO<inf>2</inf>, which mediates toxic effects on cells. Therefore, improvements in cosmetic solar shield technology are a strong priority. CeO<inf>2</inf> nanoparticles are not only UV refractors but also potent biological antioxidants due to the surface 3+/4+ valency switch, which confers anti-inflammatory, anti-ageing and therapeutic properties. Herein, UV irradiation protocols were set up, allowing selective study of the extra-shielding effects of CeO<inf>2</inf>vs. TiO<inf>2</inf> nanoparticles on reporter cells. TiO<inf>2</inf> irradiated with UV (especially UVA) exerted strong photocatalytic effects, superimposing their pro-oxidant, cell-damaging and mutagenic action when induced by UV, thereby worsening the UV toxicity. On the contrary, irradiated CeO<inf>2</inf> nanoparticles, via their Ce3+/Ce4+ redox couple, exerted impressive protection on UV-treated cells, by buffering oxidation, preserving viability and proliferation, reducing DNA damage and accelerating repair; strikingly, they almost eliminated mutagenesis, thus acting as an important tool to prevent skin cancer. Interestingly, CeO<inf>2</inf> nanoparticles also protect cells from the damage induced by irradiated TiO<inf>2</inf>, suggesting that these two particles may also complement their effects in solar lotions. CeO<inf>2</inf> nanoparticles, which intrinsically couple UV shielding with biological and genetic protection, appear to be ideal candidates for next-generation sun shields. © The Royal Society of Chemistry 2015.

Caputo, F., DE NICOLA, M., Sienkiewicz, A., . Giovanetti, A., Bejarano, I., Licoccia, S., et al. (2015). Cerium oxide nanoparticles, combining antioxidant and UV shielding properties, prevent UV-induced cell damage and mutagenesis. NANOSCALE, 7(38), 15643-15656 [10.1039/c5nr03767k].

Cerium oxide nanoparticles, combining antioxidant and UV shielding properties, prevent UV-induced cell damage and mutagenesis

DE NICOLA, MILENA;LICOCCIA, SILVIA;TRAVERSA, ENRICO;GHIBELLI, LINA
2015-01-01

Abstract

Efficient inorganic UV shields, mostly based on refracting TiO2 particles, have dramatically changed the sun exposure habits. Unfortunately, health concerns have emerged from the pro-oxidant photocatalytic effect of UV-irradiated TiO2, which mediates toxic effects on cells. Therefore, improvements in cosmetic solar shield technology are a strong priority. CeO2 nanoparticles are not only UV refractors but also potent biological antioxidants due to the surface 3+/4+ valency switch, which confers anti-inflammatory, anti-ageing and therapeutic properties. Herein, UV irradiation protocols were set up, allowing selective study of the extra-shielding effects of CeO2vs. TiO2 nanoparticles on reporter cells. TiO2 irradiated with UV (especially UVA) exerted strong photocatalytic effects, superimposing their pro-oxidant, cell-damaging and mutagenic action when induced by UV, thereby worsening the UV toxicity. On the contrary, irradiated CeO2 nanoparticles, via their Ce3+/Ce4+ redox couple, exerted impressive protection on UV-treated cells, by buffering oxidation, preserving viability and proliferation, reducing DNA damage and accelerating repair; strikingly, they almost eliminated mutagenesis, thus acting as an important tool to prevent skin cancer. Interestingly, CeO2 nanoparticles also protect cells from the damage induced by irradiated TiO2, suggesting that these two particles may also complement their effects in solar lotions. CeO2 nanoparticles, which intrinsically couple UV shielding with biological and genetic protection, appear to be ideal candidates for next-generation sun shields. © The Royal Society of Chemistry 2015.
2015
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore CHIM/07 - FONDAMENTI CHIMICI DELLE TECNOLOGIE
Settore ING-IND/22 - SCIENZA E TECNOLOGIA DEI MATERIALI
Settore BIO/13 - BIOLOGIA APPLICATA
English
Con Impact Factor ISI
http://www.scopus.com/inward/record.url?eid=2-s2.0-84942645383&partnerID=40&md5=96ac348358e548623758d0e02cacf7a3
Caputo, F., DE NICOLA, M., Sienkiewicz, A., . Giovanetti, A., Bejarano, I., Licoccia, S., et al. (2015). Cerium oxide nanoparticles, combining antioxidant and UV shielding properties, prevent UV-induced cell damage and mutagenesis. NANOSCALE, 7(38), 15643-15656 [10.1039/c5nr03767k].
Caputo, F; DE NICOLA, M; Sienkiewicz, A; . Giovanetti, A; Bejarano, I; Licoccia, S; Traversa, E; Ghibelli, L
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/132416
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