Kiss, Borbala and Biro, Tamas and Czifra, Gabriella and Toth, Balazs I. and Kertesz, Zsofia and Szikszai, Zita and Kiss, Arpad Zoltan and Juhasz, Istvan and Zouboulis, Christos C. and Hunyadi, Janos (2008) Investigation of micronized titanium dioxide penetration in human skin xenografts and its effect on cellular functions of human skin-derived cells. EXPERIMENTAL DERMATOLOGY, 17 (8). pp. 659-667.
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Titanium dioxide (TiO2) nanoparticles are ubiquitously used materials in everyday life (e.g. paints, household products and plastic goods). However, despite the wide array of common applications, their pathogenetic role was also suggested under certain conditions (e.g. pulmonary neoplasias and lung fibrosis). From a dermatological point of view, it is also of great importance that TiO2 also serves as a physical photoprotective agent in sunscreens and is widely used in various cosmetic products. However, the effect of TiO2 on human cutaneous functions is still unknown. Therefore, in the current study, we investigated the in vivo penetration of TiO2 via human skin transplanted to immunodeficient mice and, furthermore, we measured the in vitro effects of nanoparticles on various functional properties of numerous epidermal and dermal cells in culture. Hereby, using various nuclear microscopy methods, we provide the first evidence that TiO2 nanoparticles in vivo do not penetrate through the intact epidermal barrier. However, we also report that TiO2, when exposed directly to cell cultures in vitro, exerts significant and cell-type dependent effects on such cellular functions as viability, proliferation, apoptosis and differentiation. Therefore, our novel findings will hopefully inspire one to systemically explore in future, clinically oriented trials whether there is indeed a risk from micronized TiO2-containing products on skin with an impaired stratum corneum barrier function.
|Uncontrolled Keywords:||apoptosis; differentiation; epidermal penetration; micronized titanium dioxide; proliferation; skin barrier|
|Subjects:||NanoSafety > Environment, health and safety aspects of nanotechnology|
Biomedical Science > Nanotechnology for human health
|Deposited On:||06 Jul 2009 16:33|
|Last Modified:||06 Jul 2009 16:33|
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