Pifithrin-α, p-Nitro, Cyclic is a cell-permeable p53 inhibitor that exhibits 10-fold higher potency (ED50 = 30 nM in protecting etoposide-induced cortical neuron death) and 50% longer half-life (t1/2 = 6h in neuron culture medium at 37° C) than Pifithrin-α. Pifithrin-α, p-nitro, cyclic behaves p53-dependently but does not block p53 phosphorylation on Ser15 in reponse to etoposide treatment. Pifithrin-α, p-nitro, cyclic will block p53 posttranscriptional activity, however. Pifithrin-α, p-nitro, cyclic is more stable than the parent compound. Pifithrin-α, p-nitro, cyclic is not active in vivo.
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