Chronic Exposure to Low Doses of Dioxin Promotes Liver Fibrosis Development in the C57BL/6J Diet-Induced Obesity Mouse Model

• Caroline Duval ^[3] ; Fatima Teixeira-Clerc ^[4] ; Alix F. Leblanc ^[3] ; Sothea Touch ^[1] ; Claude Emond ^[2] ; Michèle Guerre-Millo ^[1] ; Sophie Lotersztajn ^[4] ; Robert Barouki ^[5] ; Martine Aggerbeck ^[3] ; Xavier Coumoul ^[3]
  1. [1] Pierre and Marie Curie University

     Pierre and Marie Curie University

     París, Francia

     
  2. [2] University of Montreal

     University of Montreal

     Canadá

     
  3. [3] 1 INSERM UMR (Institut National de la Santé et de la Recherche Médicale Unité Mixte de Recherche)-S1124, Paris, France; 2 Université Paris Descartes, ComUE (Communauté d’universités et d’établissements), Sorbonne Paris Cité, Paris, France
  4. [4] 3 INSERM UMR-S955, Hôpital Henri Mondor, Créteil, France; 4 Université Paris-Est, Créteil, France
  5. [5] 1 INSERM UMR (Institut National de la Santé et de la Recherche Médicale Unité Mixte de Recherche)-S1124, Paris, France; 2 Université Paris Descartes, ComUE (Communauté d’universités et d’établissements), Sorbonne Paris Cité, Paris, France; 8 AP-HP (Assistance Publique - Hôpitaux de Paris), Hôpital Necker-Enfants Malades, Paris, France

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• Localización: Environmental health perspectives, ISSN 0091-6765, Vol. 125, Nº. 3, 2017, págs. 428-436
• Idioma: inglés
• DOI: 10.1289/EHP316
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• Resumen

  • Exposure to persistent organic pollutants (POPs) has been associated with the progression of chronic liver diseases, yet the contribution of POPs to the development of fibrosis in non-alcoholic fatty liver disease (NAFLD), a condition closely linked to obesity, remains poorly documented.

    We investigated the effects of subchronic exposure to low doses of the POP 2,3,7,8-tetrachlorodibenzo-p-dioxin (TCDD), an aryl hydrocarbon receptor ligand, on NAFLD progression in diet-induced obese C57BL/6J mice.

    Male C57BL/6J mice were fed either a 10% low-fat (LFD) or a 45% high-fat (HFD) purified diet for 14 weeks and TCDD-exposed groups were injected once a week with 5 μg/kg TCDD or the vehicle for the last 6 weeks of the diet.

    Liver histology and triglyceride levels showed that exposure of HFD fed mice to TCDD worsened hepatic steatosis, as compared to either HFD alone or LFD plus TCDD and the mRNA levels of key genes of hepatic lipid metabolism were strongly altered in co-treated mice. Further, increased liver collagen staining and serum transaminase levels showed that TCDD induced liver fibrosis in the HFD fed mice. TCDD in LFD fed mice increased the expression of several inflammation and fibrosis marker genes with no additional effect from a HFD.

    Exposure to TCDD amplifies the impairment of liver functions observed in mice fed an enriched fat diet as compared to a low fat diet. The results provide new evidence that environmental pollutants promote the development of liver fibrosis in obesity-related NAFLD in C57BL/6J mice.

    Duval C, Teixeira-Clerc F, Leblanc AF, Touch S, Emond C, Guerre-Millo M, Lotersztajn S, Barouki R, Aggerbeck M, Coumoul X. 2017. Chronic exposure to low doses of dioxin promotes liver fibrosis development in the C57BL/6J diet-induced obesity mouse model. Environ Health Perspect 125:428–436; http://dx.doi.org/10.1289/EHP316

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