Abstract
Dioxins exert their major toxicologic effects by binding to the aryl hydrocarbon receptor (AHR) and altering gene transcription. Numerous dioxin-responsive genes previously were identified both by conventional biochemical and molecular techniques and by recent mRNA expression microarray studies. However, of the large set of dioxin-responsive genes the specific genes whose dysregulation leads to death remain unknown. To identify specific genes that may be involved in dioxin lethality we compared changes in liver mRNA levels following exposure to 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD) in three strains/lines of dioxin-sensitive rats with changes in three dioxin-resistant rat strains/lines. The three dioxin-resistant strains/lines all harbor a large deletion in the transactivation domain of the aryl hydrocarbon receptor (AHR). Despite this deletion, many genes exhibited a “Type-I” response—that is, their responses were similar in dioxin-sensitive and dioxin-resistant rats. Several genes that previously were well established as being dioxin-responsive or under AHR regulation emerged as Type-I responses (e.g. CYP1A1, CYP1A2, CYP1B1 and Gsta3). In contrast, a relatively small number of genes exhibited a Type-II response—defined as a difference in responsiveness between dioxin-sensitive and dioxin-resistant rat strains. Type-II genes include: malic enzyme 1, ubiquitin C, cathepsin L, S-adenosylhomocysteine hydrolase and ferritin light chain 1. In silico searches revealed that AH response elements are conserved in the 5′-flanking regions of several genes that respond to TCDD in both the Type-I and Type-II categories. The vast majority of changes in mRNA levels in response to 100 μg/kg TCDD were strain-specific; over 75% of the dioxin-responsive clones were affected in only one of the six strains/lines. Selected genes were assessed by quantitative RT-PCR in dose-response and time-course experiments and responses of some genes were assessed in Ahr-null mice to determine if their response was AHR-dependent. Type-II genes may lie in pathways that are central to the difference in susceptibility to TCDD lethality in this animal model.
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Supported by grant MOP-57903 from the Canadian Institutes of Health Research to A.B.O. and by grants 200980 and 211120 from the Academy of Finland to R.P.; M.A.F. and I.D.M. were supported by fellowships from the Natural Sciences and Engineering Research Council of Canada. We thank Virpi Tiihonen and Arja Tamminen for excellent technical assistance. Experiments reported in this paper comply with the current laws of Canada and of Finland.
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M.A. Franc and I.D. Moffat contributed equally to this project.
An erratum to this article can be found at http://dx.doi.org/10.1007/s00204-008-0320-z
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Franc, M.A., Moffat, I.D., Boutros, P.C. et al. Patterns of dioxin-altered mRNA expression in livers of dioxin-sensitive versus dioxin-resistant rats. Arch Toxicol 82, 809–830 (2008). https://doi.org/10.1007/s00204-008-0303-0
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DOI: https://doi.org/10.1007/s00204-008-0303-0