Gentiana scabra Restrains Hepatic Pro-Inflammatory Macrophages to Ameliorate Non-Alcoholic Fatty Liver Disease

Yiyuan Zheng; Dan Fang; Chaoyuan Huang; Lina Zhao; Liming Gan; Youlan Chen; Fengbin Liu

doi:10.3389/fphar.2021.816032

Gentiana scabra Restrains Hepatic Pro-Inflammatory Macrophages to Ameliorate Non-Alcoholic Fatty Liver Disease

Front Pharmacol. 2022 Jan 18:12:816032. doi: 10.3389/fphar.2021.816032. eCollection 2021.

Authors

Yiyuan Zheng^{1

2}, Dan Fang³, Chaoyuan Huang^{2

4}, Lina Zhao¹, Liming Gan⁵, Youlan Chen^{1

2}, Fengbin Liu^{1

6}

Affiliations

¹ Department of Gastroenterology, The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, China.
² Lingnan Medical Research Center, Guangzhou University of Chinese Medicine, Guangzhou, China.
³ Department of Oncology, Shanghai University of Traditional Chinese Medicine Longhua Hospital, Shanghai, China.
⁴ The First Clinical Medical School, Guangzhou University of Chinese Medicine, Guangzhou, China.
⁵ Department of Gastroenterology, Zhongshan Hospital of Traditional Chinese Medicine, Zhongshan, China.
⁶ Baiyun Hospital of The First Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou, China.

Abstract

Non-alcoholic fatty liver disease (NAFLD) has become a progressive metabolic disease that is emerging as a global epidemic. Considering that the complex pathogenesis has not been fully elucidated, barely specific pharmacological therapy is recommended in current guidelines. Gentiana scabra (GS) is a commonly used herb in Tibetan medicine, which has received much attention in recent years due to its diverse pharmacological properties, including anti-inflammation, anti-oxidation, and anti-fibrosis. However, the therapeutic mechanisms are still unclear. Our investigation demonstrated a regulatory effect of GS on pro-inflammatory macrophages, which was extensively investigated in NAFLD that revealed intimate participation in the disease evolution, and the non-canonical IKK family member TANK-binding kinase 1 (TBK1) was involved in this process. Plasmid vectors for shTBK1 and amlexanox (AML), an inhibitor of TBK1, were used in this study to verify the mechanisms of TBK1 both in vitro and in vivo, while a co-culture system for hepatocytes and BMDMs was constructed to confirm the critical role of macrophages for inflammatory cascade. The results revealed that metabolic burden up-regulated the phosphorylation of TBK1, resulting in activation of NF-κB signaling pathway, and consequently caused an elevated expression of MCP1 to induce the macrophage recruitment and accelerate the inflammatory cascade. In contrast, GS could inhibit the TBK1 phosphorylation and the MCP1 expression to restrain the recruitment of pro-inflammatory macrophages, so as to provide curative effects on metabolic dysfunction and inflammation. Considering that GS is non-toxic and can be used as a kind of tea for long-term drinking, we propose it may be an effective option for the prevention and treatment of NAFLD, which deserves further exploration and application, and may provide new insights to improve the current standardized intervention strategy.

Keywords: Gentiana scabra; anti-inflammation; experimental evaluation; macrophages; non-alcoholic fatty liver disease.