Abstract：
:TCDD-inducible poly-ADP-ribose polymerase (TIPARP) is an aryl hydrocarbon receptor (AHR) target gene that functions as part of a negative feedback loop to repress AHR activity. Tiparp-/- mice exhibit increased sensitivity to the toxicological effects of 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD), including lethal wasting syndrome. However, it is not known whether Tiparp-/- mice also exhibit increased sensitivity to other AHR ligands. In this study, we treated male Tiparp-/- or wild type (WT) mice with a single injection of 100 mg/kg 3-methylcholanthrene (3MC). Consistent with TIPARP's role as a repressor of AHR signaling, 3MC-treated Tiparp-/- mice exhibited increased hepatic Cyp1a1 and Cyp1b1 levels compared with WT mice. No 3MC-treated Tiparp-/- mice survived beyond day 16 and the mice exhibited chylous ascites characterized by an accumulation of fluid in the peritoneal cavity. All WT mice survived the 30-day treatment and showed no signs of fluid accumulation. Treated Tiparp-/- mice also exhibited a transient and mild hepatotoxicity with inflammation. 3MC-treated WT, but not Tiparp-/- mice, developed mild hepatic steatosis. Lipid deposits accumulated on the surface of the liver and other abdominal organs in the 3MC-Tiparp-/- mice. Our study reveals that Tiparp-/- mice have increased sensitivity to 3MC-induced liver toxicity, but unlike with TCDD, lethality is due to chylous ascites rather than wasting syndrome.
journal_name
Int J Mol Scijournal_title
International journal of molecular sciencesauthors
Cho TE,Bott D,Ahmed S,Hutin D,Gomez A,Tamblyn L,Zhou AC,Watts TH,Grant DM,Matthews Jdoi
10.3390/ijms20092312subject
Has Abstractpub_date
2019-05-10 00:00:00issue
9issn
1422-0067pii
ijms20092312journal_volume
20pub_type
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