In Vivo (Add solvents to the product individually and in order.)
Homogeneous suspension
CMC-NA
≥5mg/ml
Taking the 1 mL working solution as an example, add 5 mg of this product to 1 ml of CMC-Na solution, mix evenly to obtain a homogeneous suspension with a final concentration of 5 mg/ml.
* <1 mg/ml means slightly soluble or insoluble. * Please note that Selleck tests the solubility of all compounds in-house, and the actual solubility may differ slightly from published values. This is normal and is due to slight batch-to-batch variations. * Room temperature shipping (Stability testing shows this product can be shipped without any cooling measures.)
Preparing Stock Solutions
Biological Activity
Description
PF-5274857 is a potent and selective Smoothened (Smo) antagonist, inhibits Hedgehog (Hh) signalling with IC50 and Ki of 5.8 nM and 4.6 nM, respectively, and this compound can penetrate the blood–brain barrier.
Targets
Smoothened
Smoothened
4.6 nM(Ki)
5.8 nM
In 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 this compound with a dissociation constant of 36 μM subsequently determined in a functional assay.
In Vivo
PF-5274857 shows significant dose-dependent tumour growth inhibition (TGI) and induces tumour regression at high doses (>10 mg/kg). This compound 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 it has little effect on Smo levels. In skin tissue, downregulation of Gli1 and Gli2 is also observed with a similar time course by this chemical. The model-derived drug concentration for half maximal inhibition of the tumour Gli1 mRNA production rate (IC50) by this compound is determined to be 8.9 nM in the Ptch+/−p53+/− medulloblastoma allograft mice, which mathematically corresponds to tumour 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. It is also able to cross the blood–brain barrier in rats within 4 hours post-dose.
HEK293 cells overexpressing human Smo (amino acids 181-787) are grown in Dulbecco's Modified Eagle's Media (DMEM) supplemented with 10% FBS, Pen–Strep, and 0.1 mg/mL hygromycin to 90% confluence. After washing with cold Dulbecco's PBS, the cell pellet is resuspended in membrane preparation buffer (50 mM Tris-HCl, pH 7.5, 250 mM sucrose with Roche complete protease cocktail) and homogenised. The homogenate is centrifuged and the cell pellet is resuspended in assay buffer (50 mM Tris-HCl, pH 7.5, 100 mM NaCl, 25 mM MgCl2, 1 mM EDTA, and 0.1% protease-free bovine serum albumin) and homogenised in a glass tissue grinder. Total protein in the membrane preparation containing Smo is determined using the Pierce BCA protein assay. For the competitive binding assay, 100 μL of assay buffer is added to a 96-well GF/B filter plate for 10 minutes to pre-wet the filter and then removed. The following reagents are then added: 20 μL of assay buffer, 10 μL serial dilutions of this compound, 20 μL of 3H-Smo antagonist (3 nM final concentration), and 50 μL of membrane preparation (40 μg total protein). The plates are incubated at room temperature for 2 hours, then washed and vacuum dried. The plates are then dried for 1 hour in a 60°C oven before the addition of 45 μL of Microscint 20 and incubated at room temperature for 30 minutes to 1 hour, then counted in a TopCount scintillation counter. The data are analysed using GraphPad Prism software.
Gli-Luc/MEF cells are grown in the knockout DMEM supplemented with 10% heat-inactive FBS, 2 mM l-glutamine, and 0.55 mM β-mercaptoethanol until 90% confluence. On day 1, cells are trypsinized and seeded into white 384-well plates in 20 μL per well of OptiMEM media that is supplemented with 1% heat-inactive FBS and 1 mM sodium pyruvate at a concentration of 7,500 cells per well. Plates are incubated at 37 °C and 5% CO2 overnight. On day 2, this compound is added to the cells at a final concentration ranging from 3 μM to 50 pM at a 3-fold serial dilution followed by addition of recombinant mouse Sonic Hedgehog to a final concentration of 2 μg/mL. The cells are incubated with this chemical and Shh for 48 hours at 37 °C and 5% CO2. Luciferase assays are conducted on day 4 using the Bright-Glo Luciferase Assay System. Briefly, Bright-Glo luciferase reagent (25 μL) is added to each well of the 384-well plate containing media. Plates are kept at room temperature for 5 minutes and then read on a Luminescence plate reader. The IC50 value of this compound is calculated.
RETURN POLICY
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SHIPPING AND STORAGE
Selleck products are transported at room temperature. If you receive the product at room temperature, please rest assured, the Selleck Quality Inspection Department has conducted experiments to verify that the normal temperature placement of one month will not affect the biological activity of powder products. After collecting, please store the product according to the requirements described in the datasheet. Most Selleck products are stable under the recommended conditions.
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