PF-5274857的K_i为4.6 nM. PF-5274857可以完全抑制 Shh诱导的Hh通路活性，通过在MEF细胞中测量Smo下游基因 Gli1 的转录活性可知IC50为2.7nM。PF-5274857可以结合 Smo，IC50 为 5.8 nM. PF-5274857对μ-阿片受体可以微弱抑制，在随后的一项功能分析中测得解离常数为36μM

>98%

Store at -20℃ for one year（Powder）；Store at 2-4℃ for two weeks；Store at -20℃ for six months after dissolution.

PF5274857；PF 5274857

DMSO ：93 mg/mL (212.83 mM)

Water ：93 mg/mL (212.83 mM)

Smoothened,Smoothened

PF-5274857 completely inhibits Shh-induced Hh pathway activity with IC50 of 2.7 nM measured by the transcriptional activity of Smo downstream gene Gli1 in MEF cells. The μ-opioid receptor is weakly inhibited by PF-5274857 with a dissociation constant of 36 μM subsequently determined in a functional assay.

PF-5274857 shows significant dose-dependent tumor growth inhibition (TGI) and induces tumor regression at high doses(>10 mg/kg)., PF-5274857 downregulates Gli1, Gli2, Ptch1, and Ptch2 gene expression levels to various degrees with maximal effects being achieved between 6 and 12 hours post-dose (Gli1 is the most sensitive gene), whereas PF-5274857 has little effect on Smo levels. In skin tissue, downregulation of Gli1 and Gli2 is also observed with a similar time course by PF-5274857. The model-derived drug concentration for half maximal inhibition of the tumor Gli1 mRNA production rate (IC50) by PF-5274857 is determined to be 8.9 nM in the Ptch+/−p53+/− medulloblastoma allograft mice, which mathematically corresponds to tumor regression of 119% TGI after 6 days of plasma exposure at this concentration. In the Ptch+/−p53−/− medulloblastoma allograft mice, the IC50 value is estimated to be 3.5 nM, consistent with the Ptch+/−p53+/− results. PF-5274857 is also able to cross the blood–brain barrier in rats within 4 hours post-dose.

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

分子结构图