4.5 Article

2,3,7,8-Tetrachlorodibenzo-p-Dioxin (TCDD)-Inducible Poly-ADP-Ribose Polymerase (TIPARP/PARP7) Catalytic Mutant Mice (TiparpH532A) Exhibit Increased Sensitivity to TCDD-Induced Hepatotoxicity and Lethality

期刊

TOXICOLOGICAL SCIENCES
卷 183, 期 1, 页码 154-169

出版社

OXFORD UNIV PRESS
DOI: 10.1093/toxsci/kfab075

关键词

aryl hydrocarbon receptor; wasting syndrome; ADP-ribosylation; 2,3,7,8-tetrachlorodibenzo-p-dioxin; TCDD-inducible poly-ADP-ribose polymerase (TIPARP); poly-ADP-ribose polymerase 7 (PARP7); ADP-ribosyltransferase diphtheria toxin-like 14 (ARTD14)

资金

  1. Canadian Institutes of Health Research (CIHR) [MOP-494265, MOP-125919]
  2. Johan Throne Holst Foundation
  3. Natural Sciences and Engineering Research Council (NSERC) of Canada

向作者/读者索取更多资源

The study showed that loss of TIPARP catalytic activity increases sensitivity to TCDD-induced steatohepatitis and lethality, highlighting TIPARP as a critical negative regulator of AHR activity.
2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD)-inducible poly-adenosine diphosphate (ADP)-ribose polymerase (TIPARP/PARP7), an aryl hydrocarbon receptor (AHR) target gene and mono-ADP-ribosyltransferase, acts as part of a negative feedback loop to repress AHR signaling. This process is prevented by a single H532A mutation in TIPARP that destroys its catalytic activity. We hypothesized that the loss of TIPARP catalytic activity would increase sensitivity to TCDD-induced toxicity in vivo. To test this, we created a catalytically deficient mouse line (Tiparp(H532A)) by introducing a single H532A mutation in TIPARP. Treatment of mouse embryonic fibroblasts or hepatocytes isolated from Tiparp(H532A) mice confirmed the increased TCDD-induced expression of the AHR target genes Cyp1a1, Cyp1b1, and Tiparp. Tiparp(H532A) mice given a single injection of 10 mu g/kg TCDD, a nonlethal dose in Tiparp(+/+) mice, did not survive beyond day 10. All Tiparp(+/+) mice survived the 30-day treatment. TCDD-treated Tiparp(H532A) mice displayed increased expression of AHR target genes, increased steatohepatitis and hepatotoxicity. Hepatic RNA-sequencing revealed 7-fold more differentially expressed genes in Tiparp(H532A) mice than in Tiparp(+/+) mice (4542 vs 647 genes) 6days after TCDD treatment. Differentially expressed genes included genes involved in xenobiotic metabolism, lipid homeostasis and inflammation. Taken together, these data further support TIPARP as a critical negative regulator of AHR activity and show that loss of its catalytic activity is sufficient to increase sensitivity to TCDD-induced steatohepatitis and lethality. Since TIPARP inhibition has recently emerged as a potential anticancer therapy, the impact on AHR signaling, TCDD and polycyclic aromatic hydrocarbon toxicity will need to be carefully considered under conditions of therapeutic TIPARP inhibition.

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