Discriminating modes of toxic action in mice using toxicity in BALB/c mouse fibroblast (3T3) cells. (December 2017)

• Record Type: Journal Article
• Authors: Huang, Tao; Yan, Lichen; Zheng, Shanshan; Wang, Yue; Wang, Xiaohong; Fan, Lingyun; Li, Chao; Zhao, Yuanhui; Martyniuk, Christopher J.
• Is Part Of: Chemosphere. Volume 188(2017)
• Page Start: 73
• Page End: 80
• Publication Date: 2017-12
• Subjects: 3T3 cells -- Mice -- Mode of action -- Toxic ratio -- Threshold -- Absorption kinetics; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2017.08.135
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: The objective of this study was to determine whether toxicity in mouse fibroblast cells (3T3 cells) could predict toxicity in mice. Synthesized data on toxicity was subjected to regression analysis and it was observed that relationship of toxicities between mice and 3T3 cells was not strong (R 2 = 0.41). Inclusion of molecular descriptors (e.g. ionization, pKa) improved the regression to R 2 = 0.56, indicating that this relationship is influenced by kinetic processes of chemicals or specific toxic mechanisms associated to the compounds. However, to determine if we were able to discriminate modes of action (MOAs) in mice using the toxicities generated from 3T3 cells, compounds were first classified into "baseline" and "reactive" guided by the toxic ratio (TR) for each compound in mice. Sequence, binomial and recursive partitioning analyses provided strong predictions of MOAs in mice based upon toxicities in 3T3 cells. The correct classification of MOAs based on these methods was 86%. Nearly all the baseline compounds predicted from toxicities in 3T3 cells were identified as baseline compounds from the TR in mice. The incorrect assignment of MOAs for some compounds is hypothesized to be due to experimental uncertainty that exists in toxicity assays for both mice and 3T3 cells. Conversely, lack of assignment can also arise because some reactive compounds have MOAs that are different in mice compared to 3T3 cells. The methods developed here are novel and contribute to efforts to reduce animal numbers in toxicity tests that are used to evaluate risks associated with organic pollutants in the environment. Highlights: The modes of action (MOA) in mice can well be predicted from toxicities in 3T3 cells. Three methods are developed to predict MOAs in mice from toxicities in 3T3 cells. Most of compounds share same mode of action between in vivo and in vitro toxicity. Difference of kinetic processes results in different toxicities between mice and cells.