HLI373 (3-15 μM; 15 hours) selectively kills tumor cells harboring wild type p53.
HLI373 (10-50 μM) stabilizes cellular Hdm2 in a dose-dependent manner.
HLI373 (3 μM) activates p53 transcription.
HLI373 selectively inhibits auto-ubiquitylation of Hdm2.
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.
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.
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.
Cell Viability Assay
Cell Line: |
Wild type p53 mouse embryo fibroblasts (MEFs), and p53-deficient MEFs |
Concentration: |
3, 10, 15 μM |
Incubation Time: |
15 hours |
Result: |
Increased cell death in wild type p53 MEFs in a dose-dependent manner, p53-deficient MEFs were relatively resistant. |
Western Blot Analysis
Cell Line: |
U2OS cells |
Concentration: |
5, 10 μM |
Incubation Time: |
8 hours |
Result: |
Blocked p53 degradation caused by co-transfection with plasmids encoding p53 and Hdm2. |