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Research ArticleArticle

Non-Ahr Gene Susceptibility Loci for Porphyria and Liver Injury Induced by the Interaction of ‘Dioxin’ with Iron Overload in Mice

Susan W. Robinson, Bruce Clothier, Ruth A. Akhtar, Ai Li Yang, Isabelle Latour, Carola Van Ijperen, Michael F. W. Festing and Andrew G. Smith
Molecular Pharmacology March 2002, 61 (3) 674-681; DOI: https://doi.org/10.1124/mol.61.3.674
Susan W. Robinson
Medical Research Council Toxicology Unit, University of Leicester, Leicester, United Kingdom
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Bruce Clothier
Medical Research Council Toxicology Unit, University of Leicester, Leicester, United Kingdom
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Ruth A. Akhtar
Medical Research Council Toxicology Unit, University of Leicester, Leicester, United Kingdom
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Ai Li Yang
Medical Research Council Toxicology Unit, University of Leicester, Leicester, United Kingdom
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Isabelle Latour
Medical Research Council Toxicology Unit, University of Leicester, Leicester, United Kingdom
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Carola Van Ijperen
Medical Research Council Toxicology Unit, University of Leicester, Leicester, United Kingdom
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Michael F. W. Festing
Medical Research Council Toxicology Unit, University of Leicester, Leicester, United Kingdom
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Andrew G. Smith
Medical Research Council Toxicology Unit, University of Leicester, Leicester, United Kingdom
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Abstract

Among the actions of 2,3,7,8-tetrachlorodibenzo-p-dioxin (dioxin) in mice is the induction of hepatic porphyria. This is similar to the most common disease of this type in humans, sporadic porphyria cutanea tarda (PCT). Evidence is consistent with the actions of dioxin being mediated through binding to the aryl hydrocarbon receptor (AHR) with different Ahr alleles in mouse strains apparently accounting for differential downstream gene expression and susceptibility. However, studies of dioxin-induced porphyria and liver injury indicate that the mechanisms must involve interactions with other genes, perhaps associated with iron metabolism. We performed a quantitative trait locus (QTL) analysis of an F2 cross between susceptible C57BL/6J (Ahr b1allele) and the highly resistant DBA/2 (Ahr d allele) strains after treatment with dioxin and iron. For porphyria we found QTLs on chromosomes 11 and 14 in addition to the Ahr gene (chromosome 12). Studies with C57BL/6.D2 Ahr d mice confirmed that the Ahr d allele alone did not completely negate the response. SWR mice are syngenic for theAhr d allele with the DBA/2 strain but are susceptible to porphyria after elevation of hepatic iron. Analysis of SWR×D2 F2 mice treated with iron and dioxin showed a QTL on chromosome 11, as well as finding other loci on chromosomes 1 (and possibly 9), for both porphyria and liver injury. These findings show for the first time the location of genes, other thanAhr, that modulate the mechanism of hepatic porphyria and injury caused by dioxin in mice. Orthologous loci may contribute to the pathogenesis of human sporadic PCT.

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Molecular Pharmacology: 61 (3)
Molecular Pharmacology
Vol. 61, Issue 3
1 Mar 2002
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Research ArticleArticle

Non-Ahr Gene Susceptibility Loci for Porphyria and Liver Injury Induced by the Interaction of ‘Dioxin’ with Iron Overload in Mice

Susan W. Robinson, Bruce Clothier, Ruth A. Akhtar, Ai Li Yang, Isabelle Latour, Carola Van Ijperen, Michael F. W. Festing and Andrew G. Smith
Molecular Pharmacology March 1, 2002, 61 (3) 674-681; DOI: https://doi.org/10.1124/mol.61.3.674

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Research ArticleArticle

Non-Ahr Gene Susceptibility Loci for Porphyria and Liver Injury Induced by the Interaction of ‘Dioxin’ with Iron Overload in Mice

Susan W. Robinson, Bruce Clothier, Ruth A. Akhtar, Ai Li Yang, Isabelle Latour, Carola Van Ijperen, Michael F. W. Festing and Andrew G. Smith
Molecular Pharmacology March 1, 2002, 61 (3) 674-681; DOI: https://doi.org/10.1124/mol.61.3.674
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