Ulrike Teufel1, Teresa Peccerella1, Guido Engelmann1, Thomas Bruckner1, Christa Flechtenmacher1, Gunda Millonig1, Felix Stickel1, Georg F Hoffmann1, Peter Schirmacher1, Sebastian Mueller1, Helmut Bartsch1, Helmut K Seitz1. 1. 1 Department of Paediatrics, University of Heidelberg, Heidelberg, Germany ; 2 Alcohol Research Centre, University of Heidelberg and Department of Medicine (Gastroenterology & Hepatology), Salem Medical Centre, Heidelberg, Germany ; 3 Institute of Medical Biometry and Informatics, 4 Department of Pathology, University of Heidelberg, Heidelberg, Germany ; 5 Hepatology Unit, Clinic Beau-Site Hirslanden, Bern, Switzerland ; 6 Erstwhile: Division of Toxicology and Cancer Risk Factors, German Cancer Research Centre (DKFZ), Heidelberg, Germany.
Abstract
BACKGROUND: Carcinogenic exocyclic-DNA adducts like 1,N(6)-etheno-2'-deoxyadenosine (εdA) are formed through reactive intermediates of 4-hydroxynonenal (4-HNE) or other lipid peroxidation (LPO) products with the DNA bases A, C, methyl-C and G. High levels of hepatic etheno-DNA adducts have been detected in cancer prone liver diseases including alcoholic liver disease (ALD). In ALD εdA levels correlated significantly with cytochrome P-450 2E1 (CYP2E1) expression which is also induced in non-alcoholic steatohepatitis (NASH). We investigated the occurrence of εdA adducts in children with NASH as a DNA damage marker. METHODS: Liver biopsies from 21 children/adolescents with histologically proven NASH were analysed for hepatic fat content, inflammation, and fibrosis. εdA levels in DNA, CYP2E1-expression and protein bound 4-hydroxynonenal (HNE) were semi-quantitatively evaluated by immunohistochemistry. RESULTS: Among 21 NASH children, εdA levels in the liver were high in 3, moderate in 5, weak in 9 and not elevated in 4 patients. There was a positive correlation between CYP2E1 and protein-bound 4-HNE (r=0.60; P=0.008) and a trend for a positive relationship for CYP2E1 vs. staining intensity of εdA (r=0.45; P=0.06). Inflammatory activity and fibrosis correlated significantly (r=0.49, P=0.023). CONCLUSIONS: Our results demonstrate for the first time the presence of elevated carcinogenic etheno-DNA lesions (εdA) in the majority (17/21) of liver biopsies from young NASH patients. Our data suggest that LPO-derived etheno-adducts are implicated in NASH. Whether these adducts may serve as predictive risk markers in NASH children to develop hepatocellular cancer later in life remains to be investigated.
BACKGROUND:Carcinogenic exocyclic-DNA adducts like 1,N(6)-etheno-2'-deoxyadenosine (εdA) are formed through reactive intermediates of 4-hydroxynonenal (4-HNE) or other lipid peroxidation (LPO) products with the DNA bases A, C, methyl-C and G. High levels of hepatic etheno-DNA adducts have been detected in cancer prone liver diseases including alcoholic liver disease (ALD). In ALD εdA levels correlated significantly with cytochrome P-450 2E1 (CYP2E1) expression which is also induced in non-alcoholic steatohepatitis (NASH). We investigated the occurrence of εdA adducts in children with NASH as a DNA damage marker. METHODS: Liver biopsies from 21 children/adolescents with histologically proven NASH were analysed for hepatic fat content, inflammation, and fibrosis. εdA levels in DNA, CYP2E1-expression and protein bound 4-hydroxynonenal (HNE) were semi-quantitatively evaluated by immunohistochemistry. RESULTS: Among 21 NASH children, εdA levels in the liver were high in 3, moderate in 5, weak in 9 and not elevated in 4 patients. There was a positive correlation between CYP2E1 and protein-bound 4-HNE (r=0.60; P=0.008) and a trend for a positive relationship for CYP2E1 vs. staining intensity of εdA (r=0.45; P=0.06). Inflammatory activity and fibrosis correlated significantly (r=0.49, P=0.023). CONCLUSIONS: Our results demonstrate for the first time the presence of elevated carcinogenic etheno-DNA lesions (εdA) in the majority (17/21) of liver biopsies from young NASH patients. Our data suggest that LPO-derived etheno-adducts are implicated in NASH. Whether these adducts may serve as predictive risk markers in NASH children to develop hepatocellular cancer later in life remains to be investigated.
Entities:
Keywords:
Cytochrome P-450 2E; etheno-DNA adducts; hepatocellular cancer; lipidperoxidation-induced DNA damage; non-alcoholic steatohepatitis in children (NASH in children)
Authors: Jagadeesan Nair; Roger W Godschalk; Urmila Nair; Robert W Owen; William E Hull; Helmut Bartsch Journal: Chem Res Toxicol Date: 2012-01-03 Impact factor: 3.739
Authors: Fabrizio Gentile; Alessia Arcaro; Stefania Pizzimenti; Martina Daga; Giovanni Paolo Cetrangolo; Chiara Dianzani; Alessio Lepore; Maria Graf; Paul R J Ames; Giuseppina Barrera Journal: AIMS Genet Date: 2017-04-18