HLI373 dihydrochloride is a potent Hdm2 inhibitor, efficiently restraining the ubiquitin ligase activity of Hdm2 and effectively prompting apoptosis in DNA-damaging agent-sensitive tumor cells[1]. Additionally, HLI373 dihydrochloride exhibits antimalarial activity[2].

HLI373 (3-15 μM; 15 hours) selectively kills tumor cells harboring wild type p53[1].HLI373 (10-50 μM) stabilizes cellular Hdm2 in a dose-dependent manner. HLI373 (3 μM) activates p53 transcription[1].HLI373 selectively inhibits auto-ubiquitylation of Hdm2[1].Co-transfection with plasmids encoding p53 and Hdm2 results in degradation of p53. Incubation with HLI373 (5-10 μM; 8 hours) blocks p53 degradation. HLI373 increases p53 and Hdm2 protein levels in cells[1]. HLI 373 also shows lower IC50 values (below 6 μM) against both chloroquine-sensitive P. falciparum D6 strain (PfD6) and chloroquine-resistant P. falciparum W2 strain (PfW2) and exhibits early growth inhibition[2]. HLI-373 is a MDM2 inhibitor interrupting its ubiquitin E3 ligase activity, could abolish the ubiquitylation of its substrate protein p53. HLI-373 targets the C-terminus functioning as an E3 ubiquitin ligase[3]. Cell Viability Assay[1]Cell Line: Wild type p53 mouse embryo fibroblasts (MEFs), and p53-deficient MEFs