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J Med Chem. 2006 Jun 15;49(12):3432-5.

Structure-based design of spiro-oxindoles as potent, specific small-molecule inhibitors of the MDM2-p53 interaction.

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Department of Internal Medicine, Comprehensive Cancer Center, Life Sciences Institute, University of Michigan, 1500 E. Medical Center Drive, Ann Arbor, 48109, USA.


Potent, specific, non-peptide small-molecule inhibitors of the MDM2-p53 interaction were successfully designed. The most potent inhibitor (MI-63) has a K(i) value of 3 nM binding to MDM2 and greater than 10,000-fold selectivity over Bcl-2/Bcl-xL proteins. MI-63 is highly effective in activation of p53 function and in inhibition of cell growth in cancer cells with wild-type p53 status. MI-63 has excellent specificity over cancer cells with deleted p53 and shows a minimal toxicity to normal cells.

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