p53 α-Helix mimetics antagonize p53/MDM2 interaction and activate p53

作者：Lihong Chen, Hang Hubert Yin, Bilal Farooqi, Saı̈d M. Sebti, Andrew D. Hamilton, Jiandong Chen · 发表于：Molecular Cancer Therapeutics · 年份：2005 · DOI：10.1158/1535-7163.mct-04-0342 · 被引用次数：95 · 研究领域：Cancer-related Molecular Pathways、Click Chemistry and Applications、Epigenetics and DNA Methylation

Overexpression or hyperactivation of MDM2 contributes to functional inactivation of wild-type p53 in nearly 50% of tumors. Inhibition of p53 by MDM2 depends on binding between an NH(2)-terminal (residues 16-28) p53 alpha-helical peptide and a hydrophobic pocket on MDM2, presenting an attractive target for development of inhibitors against tumors expressing wild-type p53. Here we report that novel p53 alpha-helical peptide mimics based on a terphenyl scaffold can inhibit MDM2-p53 binding in vitro and activate p53 in vivo. Several active compounds have been identified that inhibit MDM2-p53 binding in an ELISA assay with IC(50) of 10 to 20 micromol/L and induce p53 accumulation and activation in cell culture at 15 to 40 micromol/L. These results suggest that p53 alpha-helical mimetics based on the terphenyl scaffold may be developed into potent p53 activators.