PF-5274857

• CAT Number: I001439
• CAS Number: 1373615-35-0
• Molecular Formula: C20H25ClN4O3S
• Molecular Weight: 436.96
• Purity: ≥95%
• Synonyms: 1-[4-[5-chloro-4-(3,5-dimethylpyridin-2-yl)pyridin-2-yl]piperazin-1-yl]-3-methylsulfonylpropan-1-one
• InChI: InChI=1S/C20H25ClN4O3S/c1-14-10-15(2)20(23-12-14)16-11-18(22-13-17(16)21)24-5-7-25(8-6-24)19(26)4-9-29(3,27)28/h10-13H,4-9H2,1-3H3
• InChIKey: BBVNTTZIOTWDSV-UHFFFAOYSA-N
• SMILES: CC1=CC(=C(N=C1)C2=CC(=NC=C2Cl)N3CCN(CC3)C(=O)CCS(=O)(=O)C)C

PF-5274857 is a potent, selective, orally active and brain-penetrant antagonist of Smo, with an IC50 of 5.8 nM and Ki of 4.6 nM. PF-5274857 has potential for research of tumor types including brain tumors and brain metastasis driven by an activated Hh pathway[1].
PF-5274857 completely inhibits Shh-induced Hh pathway activity with an IC50 of 2.7±1.4 nM measured by the transcriptional activity of Smo downstream gene Gli1 in MEF cells[1].
PF-5274857 shows less than 20% inhibition against a broad panel of protein kinases at 1 μM[1].
PF-5274857 (1-30 mg/kg; p.o. once daily for 6 days) shows robust antitumor efficacy and correlation between PK and PD in medulloblastoma allograft mice models[1].
PF-5274857 (10 mg/kg; i.h.) in the plasma is able to cross the blood-brain barrier in rats within 4 hours postdose[1].
PF-5274857 (10-100 mg/kg; p.o. once daily for 4 days) is able to target Smo in the brain leading to the downregulation of Hh pathway activity in the brain tumor[1].
PF-5274857 (30 mg/kg; p.o. once daily for 34 days) increases the survival rates of primary Ptch+/− p53−/− medulloblastoma mice[1].
PF-5274857 (5-30 mg/kg; p.o.) exhibits the apparent volume of distribution of 5.6±0.5 L/kg and the half-life (T1/2) of 1.7±0.1 hours[1].

Reference

[1]. Rohner A, et al. Effective targeting of Hedgehog signaling in a medulloblastoma model with PF-5274857, a potent and selective Smoothened antagonist that penetrates the blood-brain barrier. Mol Cancer Ther. 2012, 11(1), 57-65.
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