title: Prolonged feeding with green tea polyphenols exacerbates cholesterol-induced fatty liver disease in mice.
abstract: This study investigated the potential deleterious impact of dietary supplementation with green tea extract (GTE) on the progression of fatty liver disease, in a mouse model of cholesterol-induced steatohepatitis that represents chronic liver injury.
  
  
  
  Male C57BL mice (n = 32, 8-wk-old) were fed for 6 wk with one of the following diets: normal control diet (ND, Con), Con + 1% w/w polyphenols from GTE (Con + GTE); high cholesterol diet, Con + 1% cholesterol + 0.5% cholate w/w (HCD); HCD + 1% green tea polyphenols w/w (HCD + GTE). Hepatic steatosis, oxidative, and inflammatory markers and bile acid synthesis pathways were measured. HCD supplementation resulted in hepatic steatosis and liver damage. In animals supplemented with the HCD + GTE an exacerbated hepatic steatosis, oxidative stress, and inflammatory response were observed compared to HCD supplemented animals. HCD + GTE supplementation elevated blood levels of liver enzymes and serum bile acids compared HCD-treated animals. HCD + GTE supplementation altered bile acid synthesis in the cholesterol clearance pathway, inducing a shift from the classically regulated CYP7A1 pathway to the alternative acidic pathway.
  
  
  
  Prolonged GTE supplementation dramatically increased hepatic oxidative stress, inflammation and liver injury, and altered the bile acid synthesis pathway in mice fed a HCD.
authors.affiliation: Institute of Biochemistry, Food Science and Nutrition, The Hebrew University of Jerusalem, Jerusalem, Israel.
authors.forename: Nina
authors.initials: N
authors.lastname: Hirsch
authors.affiliation: Institute of Biochemistry, Food Science and Nutrition, The Hebrew University of Jerusalem, Jerusalem, Israel.
authors.forename: Anya
authors.initials: A
authors.lastname: Konstantinov
authors.affiliation: Institute of Biochemistry, Food Science and Nutrition, The Hebrew University of Jerusalem, Jerusalem, Israel.
authors.forename: Sarit
authors.initials: S
authors.lastname: Anavi
authors.affiliation: Institute of Biochemistry, Food Science and Nutrition, The Hebrew University of Jerusalem, Jerusalem, Israel.
authors.forename: Anna
authors.initials: A
authors.lastname: Aronis
authors.affiliation: Institute of Biochemistry, Food Science and Nutrition, The Hebrew University of Jerusalem, Jerusalem, Israel.|Department of Obstetrics and Gynecology, Kaplan Medical Center, Rehovot, Israel.
authors.forename: Zion
authors.initials: Z
authors.lastname: Hagay
authors.affiliation: Institute of Biochemistry, Food Science and Nutrition, The Hebrew University of Jerusalem, Jerusalem, Israel.
authors.forename: Zecharia
authors.initials: Z
authors.lastname: Madar
authors.affiliation: Institute of Biochemistry, Food Science and Nutrition, The Hebrew University of Jerusalem, Jerusalem, Israel.
authors.forename: Oren
authors.initials: O
authors.lastname: Tirosh
mesh_terms: D000818:Animals; D002791:Cholesterol, Dietary / Q000009:adverse effects*; D059305:Diet, High-Fat / Q000009:adverse effects; D004195:Disease Models, Animal; D005234:Fatty Liver / Q000097:blood / Q000188:drug therapy*; D007249:Inflammation / Q000097:blood; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D018384:Oxidative Stress / Q000187:drug effects; D059808:Polyphenols / Q000008:administration & dosage*; D013662:Tea / Q000737:chemistry*
chemical_list: D002791:Cholesterol, Dietary; D059808:Polyphenols; D013662:Tea
keywords: Lipotoxicity; Metabolism; Nonalcoholic steatohepatitis; Nutrition; Polyphenols