Harringtonolide is a potent RACK1 inhibitor ( IC 50 =39.66 μM in A375 cells). Harringtonolide inhibits the epithelial-mesenchymal transition (EMT) process and cell proliferation by affecting the interaction between FAK and RACK1 . Harringtonolide has plant growth inhibitory, antiviral, anti-inflammatory, and antiproliferation activities In Vitro Harringtonolide (0-50 μM; 24 hours) exhibits good antiproliferation activity in A375 cells with IC 50 of 39.66 μM. Harringtonolide (0-20 μM; 1 hour) restrains the proteolysis of RACK1 by Pronase, and protects temperature-dependent degradation of RACK1. Harringtonolide (0-4 μM; 24 hours) suppresses the phosphorylation of FAK dose-dependently and inhibits Src and STAT3, the downstream proteins of FAK. Harringtonolide (0-4 μM; 24 hours) dose-dependently inhibits the RACK1–FAK interaction in A375 cells. MCE has not independently confirmed the accuracy of these methods. They are for reference only. Cell Proliferation Assay Cell Line: A375 melanoma cellsConcentration: 0-50 μM Incubation Time: 24 hours Result: Showed good antiproliferation activity with IC 50 of 39.66 μM. Western Blot Analysis Cell Line: A375 melanoma cellsConcentration: 0, 0.5, 1, 2, 4 μM Incubation Time: 24 hours Result: Suppressed the phosphorylation of FAK dose-dependently and inhibited Src and STAT3, the downstream proteins of FAK. Form:Solid IC50& Target:IC 50 : 39.66 μM (RACK1) in A375 cells