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BIOSAFETY EVALUATION AND ANTI-OXIDATIVE EFFECTS OF CERIA NANOPARTICLES IN VITRO

机译:铈纳米粒子的体外生物安全性评价和抗氧化作用

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Ceria nanoparticles are well known as high-performance catalysts due to the presence of mixed valence states of Ce3+ and Ce4+, and the presence of oxygen vacancies. Ceria nanoparticles are also potent free-radical scavengers due to its SOD mimics, catalase mimics and oxidase mimics. It is speculated that nanoceria would promote cell survival under conditions of oxidative stress due to its selective antioxidant properties. The antioxidant properties can be affected by the physicochemical properties of the materials and the target cells species. Therefore, in the present study, we evaluate the biosafety and protective effect of two different sizes of ceria nanoparticles in human umbilical vein endothelial cells (HUVECS) and human bronchial epithelial cells (HBE), as they are the primary routes of human exposure to nanoparticles through inhalation and injection. Based on the results of cell viability assay and cell membrane integrity assay, we found that ceria nanoparticles of both sizes are biocompatible to both HUVECS and HBE cells, though ceria nanoparticles have a slightly interference in the intracellular redox balance. In addition, ceria nanoparticles showed protective effect on the cell viability of both cells under oxidative stress. Detailed studies on the intracellular molecular mechanisms for the anti-oxidative effects will be studies to understand the nanoparticles-cell interactions. These results obtained in vitro may provide insights for real biomedical applications and risk assessment of ceria nanoparticles.
机译:由于Ce3 +和Ce4 +的混合价态的存在以及氧空位的存在,二氧化铈纳米粒子被公认为是高性能催化剂。二氧化铈纳米颗粒由于其SOD模拟,过氧化氢酶模拟和氧化酶模拟,因此也是有效的自由基清除剂。据推测,纳米氧化铈由于其选择性的抗氧化剂性质而在氧化应激条件下将促进细胞存活。抗氧化剂的性质会受到材料和靶细胞种类的物理化学性质的影响。因此,在本研究中,我们评估两种不同大小的二氧化铈纳米颗粒在人脐静脉内皮细胞(HUVECS)和人支气管上皮细胞(HBE)中的生物安全性和保护作用,因为它们是人类接触纳米颗粒的主要途径通过吸入和注射。基于细胞活力测定和细胞膜完整性测定的结果,我们发现两种尺寸的二氧化铈纳米颗粒均与HUVECS和HBE细胞具有生物相容性,尽管二氧化铈纳米颗粒对细胞内的氧化还原平衡有轻微的干扰。另外,二氧化铈纳米颗粒在氧化应激下对两个细胞的细胞活力均显示出保护作用。有关抗氧化作用的细胞内分子机制的详细研究将被研究以了解纳米颗粒与细胞之间的相互作用。体外获得的这些结果可能为真正的生物医学应用和氧化铈纳米颗粒的风险评估提供见识。

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