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Constitutive androstane receptor (CAR) mediates dieldrin-induced liver tumorigenesis in mouse

  • Genotoxicity and Carcinogenicity
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Abstract

Dieldrin has been shown to induce liver tumors selectively in mice. Although the exact mechanism is not fully understood, previous studies from our laboratory and others have shown that dieldrin induced liver tumors in mice through a non-genotoxic mechanism acting on tumor promotion stage. Two studies were performed to examine the role of nuclear receptor activation as a possible mode of action (MOA) for dieldrin-induced mouse liver tumors. In the initial study, male C57BL/6 mice (6- to 8-week old) were treated with dieldrin in diet (10 ppm) for 7, 14, and 28 days. Phenobarbital (PB), beta-naphthoflavone (BNF) and Di (2-ethylhexyl) phthalate (DEHP) were included as positive controls in this study for evaluating the involvement of CAR (constitutive androstane receptor), AhR (aryl hydrocarbon receptor) or PPARα (peroxisome proliferator activated receptor alpha) in the MOA of dieldrin hepatocarcinogenesis. A significant increase in hepatocyte DNA synthesis (BrdU incorporation) was seen in treated mice compared with the untreated controls. Analysis of the expression of the nuclear receptor responsive genes revealed that dieldrin induced a significant increase in the expression of genes specific to CAR activation (Cyp2b10, up to 400- to 2700-fold) and PXR activation (Cyp3a11, up to 5- to 11-fold) over untreated controls. The AhR target genes Cyp1a1 and Cyp1a2 were also slightly induced (2.0- to 3.7-fold and 1.7- to 2.8-fold, respectively). PPARα activation was not seen in the liver following dieldrin treatment. In addition, consistent with previous studies in our lab, treatment with dieldrin produced significant elevation in the hepatic oxidative stress. In a subsequent study using CAR, PXR, and CAR/PXR knockout mice, we confirmed that the dieldrin-induced liver effects in mouse were only mediated by the activation of CAR receptor. Based on these findings, we propose that dieldrin induced liver tumors in mice through a nuclear receptor CAR-mediated mode of action. The previously observed oxidative stress/damage may be an associated or modifying factor in the process of dieldrin-induced liver tumor formation subsequent to the CAR activation.

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Acknowledgements

The research work was supported in part by Internal Funding to the Klaunig Lab at Indiana University. This manuscript is dedicated to two distinguished senior toxicologists, Drs. Donald Stevenson and Earl Walborg who introduced our lab to the dieldrin problem in the late 1980s.

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  1. Laboratory of Investigative Toxicology and Pathology, Department of Environmental Health, Indiana University School of Public Health, 1025 E 7th St, Bloomington, IN, 47405, USA

    Zemin Wang, Qiangen Wu, Xilin Li & James E. Klaunig

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  1. Zemin Wang
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  4. James E. Klaunig
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Correspondence to James E. Klaunig.

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Wang, Z., Wu, Q., Li, X. et al. Constitutive androstane receptor (CAR) mediates dieldrin-induced liver tumorigenesis in mouse. Arch Toxicol 94, 2873–2884 (2020). https://doi.org/10.1007/s00204-020-02781-8

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