Abstract
Backgrounds
3,4-Dichloroaniline (3,4-DCA) is a transformation product of herbicides that is commonly used as a reference in developmental toxicity studies (OECD TG 236) (Bonnet et al. in Environ Toxicol 22:78–91, 2007). However, the mechanisms underlying 3,4-DCA-induced hepatotoxicity are not well known.
Methods
We exposed zebrafish larvae at 72 hpf to 3,4-DCA for 3 days and observed lipid accumulation in liver treated with 10-μM 3,4-DCA using oil red O staining. Subsequently, we performed qRT-PCR analysis to determine the genes involved in the observed lipid accumulation.
Results
We found that genes related to lipogenesis (srebp1, pparγ, lipin1, and scd1) and ER stress (bip, atf4, ddit3, dnajc3, and edem1) were significantly upregulated. In addition, we found that ROS generation increased in the larvae treated with 10-μM 3,4-DCA. Moreover, glutathione-S-transferase activity in these larvae was increased by 3,4-DCA in a dose-dependent manner, and the expression of the inflammation marker il-1β increased.
Conclusion
Our results indicated that exposure to 3,4-DCA induced fatty liver in zebrafish larvae and that this, in association with additional factors such as ER stress response, can promote liver damage. We accordingly suggest that 3,4-DCA could be used to induce fatty liver in zebrafish larvae.
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Acknowledgements
Ji-Seon Park designed the project, performed experiments, prepared figures and wrote the manuscript. Jeongah Song, contributed to acquisition and analysis. Jong-Su Park, and Sangwoo Lee contributed to the zebrafish care, breeding, and embryo culture. Jieon Lee, Han-Jin Park and Woo-Keun Kim contributed to the guidance of experiments. Seokjoo Yoon reviewed and edited the manuscript. Hang-Suk Chun formulated ideas, designed the project, reviewed and edited the manuscript. This work was supported by the National Research Foundation of Korea [NRF-2017R1C1B2007686].
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Ji-Seon Park, Jeongah Song, Jong-Su Park, Sangwoo Lee, Jieon Lee, Han-Jin Park, Woo-Keun Kim, Seokjoo Yoon, Hang-Suk Chun declared that have no conflict of interest.
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Park, JS., Song, J., Park, JS. et al. 3,4-Dichloroaniline promotes fatty liver in zebrafish larvae. Mol. Cell. Toxicol. 16, 159–165 (2020). https://doi.org/10.1007/s13273-019-00066-5
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DOI: https://doi.org/10.1007/s13273-019-00066-5