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Abstract Title:

Gamma-Tocotrienol Attenuates the Hepatic Inflammation and Fibrosis by Suppressing Endoplasmic Reticulum Stress in Mice.

Abstract Source:

Mol Nutr Food Res. 2018 11 ;62(21):e1800519. Epub 2018 Sep 9. PMID: 30183139

Abstract Author(s):

Yongeun Kim, Sathish Kumar Natarajan, Soonkyu Chung

Article Affiliation:

Yongeun Kim

Abstract:

SCOPE: Gamma-tocotrienol (γT3), an unsaturated isoform of vitamin E, is implicated in the hepatoprotective effects. The aim is to determine the effectiveness of γT3 on nonalcoholic fatty liver disease (NAFLD).

METHODS AND RESULTS: C57BL/6 male mice are fed a diet containing high fat (45%) and cholesterol (0.2%) along with sucrose drink (HFCS) or HFCS diet supplemented with 0.1%γT3 (HFCS + γT3). The inclusion of γT3 robustly decreases the HFCS diet-induced de novo lipogenesis (DNL), ER stress, and inflammation leading to reduced hepatic steatosis and fibrosis. Next, mice are fed a methionine- and choline-deficient (MCD) diet or MCD diet with γT3 (MCD + γT3). The γT3 supplementation significantly reduces the MCD diet-induced hepatic ER stress and fibrosis despite the minimal impact on steatosis. To further investigate the role of ER stress, the mice with genetic ablation of CHOP are fed an MCD or MCD + γT3 diet. CHOP deletion abolishes the γT3-mediated suppression of hepatic fibrosis, suggesting that modulation of ER stress is a prerequisite to inhibit hepatic inflammation and fibrosis.

CONCLUSION: γT3 supplementation is effective in attenuating NAFLD and fibrosis through a synergistic mechanism of decreased DNL and hepatic ER stress. This work strongly supports the translational potential of γT3 supplementation against NAFLD.

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