Cellular and Molecular Gastroenterology and Hepatology (Jan 2021)

Sodium Butyrate Supplementation Inhibits Hepatic Steatosis by Stimulating Liver Kinase B1 and Insulin-Induced GeneSummary

  • Ze-Hua Zhao,
  • Zi-Xuan Wang,
  • Da Zhou,
  • Yamei Han,
  • Fengguang Ma,
  • Zhimin Hu,
  • Feng-Zhi Xin,
  • Xiao-Lin Liu,
  • Tian-Yi Ren,
  • Feifei Zhang,
  • Yaqian Xue,
  • Aoyuan Cui,
  • Zhengshuai Liu,
  • Jinyun Bai,
  • Yuxiao Liu,
  • Genxiang Cai,
  • Weitong Su,
  • Xiaozhen Dai,
  • Feng Shen,
  • Qin Pan,
  • Yu Li,
  • Jian-Gao Fan

Journal volume & issue
Vol. 12, no. 3
pp. 857 – 871

Abstract

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Background and Aims: Butyric acid is an intestinal microbiota-produced short-chain fatty acid, which exerts salutary effects on alleviating nonalcoholic fatty liver disease (NAFLD). However, the underlying mechanism of butyrate on regulating hepatic lipid metabolism is largely unexplored. Methods: A mouse model of NAFLD was induced with high-fat diet feeding, and sodium butyrate (NaB) intervention was initiated at the eighth week and lasted for 8 weeks. Hepatic steatosis was evaluated and metabolic pathways concerning lipid homeostasis were analyzed. Results: Here, we report that administration of NaB by gavage once daily for 8 weeks causes an augmentation of insulin-induced gene (Insig) activity and inhibition of lipogenic gene in mice fed with high-fat diet. Mechanistically, NaB is sufficient to enhance the interaction between Insig and its upstream kinase AMP-activated protein kinase (AMPK). The stimulatory effects of NaB on Insig-1 activity are abolished in AMPKα1/α2 double knockout (AMPK−/−) mouse primary hepatocytes. Moreover, AMPK activation by NaB is mediated by LKB1, as evidenced by the observations showing NaB-mediated induction of phosphorylation of AMPK, and its downstream target acetyl-CoA carboxylase is diminished in LKB1–/– mouse embryonic fibroblasts. Conclusions: These studies indicate that NaB serves as a negative regulator of hepatic lipogenesis in NAFLD and that NaB attenuates hepatic steatosis and improves lipid profile and liver function largely through the activation of LKB1-AMPK-Insig signaling pathway. Therefore, NaB has therapeutic potential for treating NAFLD and related metabolic diseases.

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