SAG is a potent Smo receptor agonist which activates the Hedgehog signaling pathway with a Kd of 59 nM.
CUR61414 is a novel, potent and cell permeable Hedgehog signaling pathway inhibitor (IC50 =100-200 nM). CUR61414 is a small-molecule aminoproline class compound and selectively binds to smoothened (Smo) with a Ki value of 44 nM. CUR-61414 can induce apoptosis in cancer cells without affecting neighboring non-tumor cells[1][2].
RL-0070933 is a potent smo cilial modulator with an EC50 value of 0.02 µM. RL-0070933 modulates the translocation and/or accumulation of smoothened to the primary cilia by hedgehog signaling pathway[1].
Erismodegib diphosphate (LDE225 diphosphate) is a potent and selective Smo antagonist with IC50 of 1.3 nM and 2.5 nM for mouse and human Smo in binding assay, respectively.
PF-5274857 is a potent and selective Smoothened (Smo) antagonist, inhibits Hedgehog (Hh) signaling with IC50 and Ki of 5.8 nM and 4.6 nM, respectively, and can penetrate the blood–brain barrier.IC50 value: 5.8 nMTarget: Smoothenedin vitro: 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 [1].in vivo: 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 [1].