Euphornin L promotes lipid clearance by dual regulation of LDLR and PCSK9

xlomafota13 shared this article with you from Inoreader Euphornin L promotes lipid clearance by dual regulation of LDLR and PCSK9 Via Experimental and therapeutic medicine Exp Ther Med. 2021 Dec;22(6):1381. doi: 10.3892/etm.2021.10817. Epub 2021 Sep 28. ABSTRACT Our previous study identified euphornin L as an active lipid-lowering compound in high-fat diet-fed Golden Syrian hamsters. The aim of the present study was to investigate the mechanisms underlying the lipid-lowering effects of euphornin L. Euphornin L in HepG2 cells was assessed via DiI-LDL update assays and found to increase LDL-update and LDLR protein levels. RNA interference assays demonstrated that its LDL-update effects were LDLR-dependent. Dual luciferase reporter and mRNA stability assays revealed that euphornin L had little effect on LDLR mRNA transcription but lengthened the half-life of LDLR mRNA by activating ERK protein in cells. Euphornin L decreased the secretion of PCSK9 protein and alleviated PCSK9-mediated LDLR protein degradation. In vivo experiments in hamsters, which were treated with euphornin L (30 mg/k g/day) for 3 weeks, confirmed these findings. LDLR protein levels in liver tissue were upregulated, while PCSK9 protein levels in serum were downregulated. Altogether, the present study demonstrated that euphornin L increased LDLR protein levels by dual regulation of LDLR mRNA and PCSK9 protein, and represented an active compound for lipid-lowering drug development. PMID:34650629 | PMC:PMC8506954 | DOI:10.3892/etm.2021.10817 View on the web Inoreader. Take back control of your news feed. Follow us on Twitter and Facebook.