Natural Potent NAAA Inhibitor Atractylodin Counteracts LPS-Induced Microglial Activation

Frontiers in Pharmacology

卷:11

Haiping Zhang¹  Yitian Li²  Chunyan Ji²  Jie Ren²  Yan Qiu²  Long Li³  Zhaokai Wang⁴  Fan Hu⁴  Fang Zhang⁴  Longhe Yang⁴ 

[1] Center for High Performance Computing, Joint Engineering Research Center for Health Big Data Intelligent Analysis Technology, Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences,Shenzhen, China;

[2] Eye Institute of Xiamen University, Fujian Provincial Key Laboratory of Ophthalmology and Visual Science, School of Medicine, Xiamen University, Xiamen, China;

[3] Institute of Drug Discovery Technology, Ningbo University, Ningbo, China;

[4] Technical Innovation Center for Utilization of Marine Biological Resources, Third Institute of Oceanography, Ministry of Natural Resources,Xiamen, China;

关键词: NAAA inhibitor;    atractylodin;    anti-inflammation;    microglia;    traditional Chinese medicine;   

DOI  :  10.3389/fphar.2020.577319

来源: DOAJ

【 摘 要 】

N-acylethanolamine-hydrolyzing acid amidase (NAAA) is a lysosomal enzyme that inhibits the degradation of palmitoylethanolamide (PEA), an endogenous lipid that induces analgesic, anti-inflammation, and anti-multiple sclerosis through PPARα activation. Only a few potent NAAA inhibitors have been reported to date, which is mainly due to the restricted substrate-binding site of NAAA. Here, we established a high-throughput fluorescence-based assay for NAAA inhibitor screening. Several new classes of NAAA inhibitors were discovered from a small library of natural products. One of these is atractylodin, a polyethylene alkyne compound from the root of Atractylodes lancea (Thunb) DC., which significantly inhibits NAAA activity and has an IC50 of 2.81 µM. Kinetic analyses and dialysis assays suggested that atractylodin engages in competitive inhibition via reversible reaction to the enzyme. Docking assays revealed that atractylodin occupies the catalytic cavity of NAAA, where the atractylodin furan head group has a hydrophobic-related interaction with the backbone of the Trp181 and Leu152 residues of human NAAA. Further investigation indicated that atractylodin significantly increases PEA and OEA levels and dose-dependently inhibits LPS-induced nitrate, TNF-α, IL-1β, and IL-6 pro-inflammatory cytokine release in BV-2 microglia. Our results show that atractylodin elevates cellular PEA levels and inhibits microglial activation by inhibiting NAAA activity, which in turn could contribute to NAAA functional research.

【 授权许可】

Unknown