Department of Chemical and Product Safety, German Federal Institute for Risk Assessment (BfR), Berlin, Germany.
Department of Experimental Toxicology and Ecology, BASF SE, Ludwigshafen, Germany.
Arch Toxicol. 2017 Dec;91(12):3991-4007. doi: 10.1007/s00204-017-2015-9. Epub 2017 Jun 22.
Inhalation is considered a critical uptake route for NMs, demanding for sound toxicity testing using relevant test systems. This study investigates cytotoxicity and genotoxicity in EpiAirway™ 3D human bronchial models using 16 well-characterized NMs, including surface-functionalized 15 nm SiO (4 variants), 10 nm ZrO (4), and nanosilver (3), ZnO NM-110, TiO NM-105, BaSO NM-220, and two AlOOH NMs. Cytotoxicity was assessed by LDH and ATP assays and genotoxicity by the alkaline comet assay. For 9 NMs, uptake was investigated using inductively coupled plasma-mass spectrometry (ICP-MS). Most NMs were neither cytotoxic nor genotoxic in vitro. ZnO displayed a dose-dependent genotoxicity between 10 and 25 µg/cm. Ag.50.citrate was genotoxic at 50 µg/cm. A marginal but still significant genotoxic response was observed for SiO.unmodified, SiO.phosphate and ZrO.TODS at 50 µg/cm. For all NMs for which uptake in the 3D models could be assessed, the amount taken up was below 5% of the applied mass doses and was furthermore dose dependent. For in vivo comparison, published in vivo genotoxicity data were used and in addition, at the beginning of this study, two NMs were randomly selected for short-term (5-day) rat inhalation studies with subsequent comet and micronucleus assays in lung and bone marrow cells, respectively, i.e., ZrO.acrylate and SiO.amino. Both substances were not genotoxic neither in vivo nor in vitro. EpiAirway™ 3D models appear useful for NM in vitro testing. Using 16 different NMs, this study confirms that genotoxicity is mainly determined by chemical composition of the core material.
吸入被认为是纳米材料(NMs)的关键摄取途径,因此需要使用相关测试系统进行良好的毒性测试。本研究使用 16 种经过充分表征的 NM,包括表面功能化的 15nmSiO(4 种变体)、10nmZrO(4 种)和纳米银(3 种)、ZnONM-110、TiONM-105、BaSOnm-220 和两种 AlOOH NM,在 EpiAirway™3D 人支气管模型中研究了细胞毒性和遗传毒性。通过 LDH 和 ATP 测定评估细胞毒性,通过碱性彗星试验评估遗传毒性。对于 9 种 NM,使用电感耦合等离子体质谱法(ICP-MS)研究了摄取情况。大多数 NM 在体外均无细胞毒性和遗传毒性。ZnO 在 10-25μg/cm 之间表现出剂量依赖性遗传毒性。50μg/cm 的 Ag.50.citrate 具有遗传毒性。在 50μg/cm 时,SiO.unmodified、SiO.phosphate 和 ZrO.TODS 观察到边缘但仍然显著的遗传毒性反应。对于所有可评估 3D 模型中摄取情况的 NM,摄取量均低于应用质量剂量的 5%,并且与剂量有关。为了进行体内比较,使用了已发表的体内遗传毒性数据,并在本研究开始时,随机选择了两种 NM 进行为期 5 天的大鼠吸入研究,随后分别在肺和骨髓细胞中进行彗星和微核试验,即 ZrO.acrylate 和 SiO.amino。这两种物质无论是在体内还是体外均无遗传毒性。EpiAirway™3D 模型似乎可用于 NM 的体外测试。使用 16 种不同的 NM,本研究证实遗传毒性主要由核心材料的化学成分决定。
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