Testing in vitro toxicity of nanoparticles in 3D cell culture with various extracellular matrix scaffold
Choi, J. W.; Bae, S.-H.; Kim, I. Y.; Kwak, M.; Lee, T. G.; Heo, M. B.
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Nanomaterials are used in a variety of fields and toxicity assessment is paramount for their development and application. Although most toxicity assessments have been performed in 2D (2-Dimensional) cell culture, the inability to adequately replicate the in vivo environment and toxicity is a limitation. To overcome the limitation, a 3D (3-Dimensional) cell culture method has been developed to make an environment closer to an in vivo system. In this study, 20 nm SiO2 nanoparticles were dispersed in serum-containing (SC) and serum-free (SF) media to compare 2D cell culture and 3D cell culture toxicity. The cells were subjected to a 3D cell culture method in which HepG2, a human-derived liver cancer cell line, was mixed on a scaffold. We found that nanoparticles induced toxicity in 2D cell culture, but toxicity was not observed in 3D cell culture similar to in vivo environment. However, differences in toxicity were observed between the three types of scaffolds in the absence of serum as the number of cells decreased.
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