Old targets, new strategy: Apigenin-7-O-β-d-(-6″-p-coumaroyl)-glucopyranoside prevents endothelial ferroptosis and alleviates intestinal ischemia-reperfusion injury through HO-1 and MAO-B inhibition.

Abstract

With the increasing morbidity and mortality, intestinal ischemia/reperfusion injury (IIRI) has attracted more and more attention, but there is no efficient therapeutics at present. Apigenin-7-O-β-D-(-6″-p-coumaroyl)-glucopyranoside (APG) is a new flavonoid glycoside isolated from Clematis tangutica that has strong antioxidant abilities in previous studies. However, the pharmacodynamic function and mechanism of APG on IIRI remain unknown. This study aimed to investigate the effects of APG on IIRI both in vivo and in vitro and identify the potential molecular mechanism. We found that APG could significantly improve intestinal edema and increase Chiu's score. MST analysis suggested that APG could specifically bind to heme oxygenase 1 (HO-1) and monoamine oxidase b (MAO-B). Simultaneously, APG could attenuate ROS generation and Fe2+ accumulation, maintain mitochondria function thus inhibit ferroptosis with a dose-dependent manner. Moreover, we used siRNA silencing technology to confirm that knocking down both HO-1 and MAO-B had a positive effect on intestine. In addition, we found the HO-1 and MAO-B inhibitors also could reduce endothelial cell loss and protect vascular endothelial after reperfusion. We demonstrate that APG plays a protective role on decreasing activation of HO-1 and MAO-B, attenuating IIRI-induced ROS generation and Fe2+ accumulation, maintaining mitochondria function thus inhibiting ferroptosis.

• Authors: Ying-Da Feng, Wen Ye, Wen Tian, Jing-Ru Meng, Meng Zhang, Yang Sun, Hui-Nan Zhang, Shou-Jia Wang, Ke-Han Wu, Chen-Xu Liu, Shao-Yuan Liu, Wei Cao, Xiao-Qiang Li
• Journal: Free radical biology & medicine (Free Radic Biol Med) Vol. 184 Pg. 74-88 (05 01 2022) ISSN: 1873-4596 [Electronic] United States
• PMID: 35398494 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: Copyright © 2022 Elsevier Inc. All rights reserved.

Chemical References

• Reactive Oxygen Species
• Apigenin
• Heme Oxygenase-1
• Monoamine Oxidase

Topics

• Apigenin (pharmacology)
• Ferroptosis
• Heme Oxygenase-1 (genetics, metabolism)
• Humans
• Intestines
• Monoamine Oxidase
• Reactive Oxygen Species
• Reperfusion Injury (drug therapy, genetics, metabolism)