Compound K1 (Institute of Medicinal Plant Development)

Atherosclerosis (AS) is a chronic vascular disease with complex pathological mechanisms, characterized primarily by the formation of aortic plaques. Calenduloside E (CE), a compound isolated from Aralia elata, exhibits beneficial cardiovascular activities. Our previous studies have shown that CE can protect human umbilical vein endothelial cells (HUVECs) from damage induced by oxidized low-density lipoprotein (ox-LDL) through binding to the target protein HSP90AB1 in cell lysate. However, there is currently no direct research demonstrating the anti-atherosclerotic effect of CE in vivo, and its mechanism of action and direct targets in cell remain unclear. This study demonstrates that CE exhibits potent anti-atherosclerotic activity. In vivo, CE shows significant anti-atherosclerotic activity by inhibiting plaque formation in ApoE^-/- mice. Using the CC-ABPP strategy, we employed the activity-based probe CE-P to pull down the targets of CE in live HUVECs, and proteomic analysis identified phosphoglycerate kinase 1 (PGK1) as a potential direct target of CE. The interaction between the two was verified by Surface Plasmon Resonance (SPR), Cellular Thermal Shift Assay (CETSA), and molecular dynamics simulation studies. Additionally, we designed and synthesized 18 CE derivatives for PGK1 activity assays and found that CE and its derivatives can significantly inhibit PGK1 enzymatic activity. Notably, K1 exhibited the best activity in protecting HUVECs against ox-LDL-induced damage at 0.78 μM. In summary, these results indicate that CE is a promising anti-atherosclerotic agent, and PGK1 is a potential direct target of CE. PGK1 may serve as a highly promising therapeutic target for anti-atherosclerosis in the future.