[Description]:
PHT-247 is an inhibitor of the pleckstrin homology (PH) domain of Akt, and it is also an inhibitor of PDPK1 with Kis of 2.7 µM and 5.2 µM and for Akt and PDPK1, respectively.
[Related Catalog]:
[Target]
Akt:2.7 μM (Ki)
PDPK1:5.2 μM (Ki)
[In Vitro]
The effects of PHT-427 on cell signaling are investigated by RPPA using a panel of 86 antibodies to phospho- and non-phosphorylated signaling protein related to PtdIns-3-K/PDPK1/Akt signaling in PC-3 prostate cells where PtdIns-3-K/PDPK1/Akt signaling is activated because of homozygous PTEN mutation. After 16 hours, a reduction is observed in phospho-Ser241-PDPK1 phospho-Thr308-Akt by both 10 µM PH-427 and 0.1 µM Wortmannin. Finally, phospho-Ser657-protein kinase C (PKC) and total SGK1 are decreased by treatment with both PHT-427 and Wortmannin. These results suggest that at 10 µM PHT-427 inhibits both Akt and PDKP1. The BxPC-3 and MiaPaCa-2 pancreatic cancer cell lines are probed by Western blotting following up to 24 hr exposure to 10 µM PHT-427, which is below the IC50 for cell growth inhibition of around 30 µM, to determine the effects of PHT-427 on of the PtdIns-3-K/PDPK1/Akt signaling pathway components[1].
[In Vivo]
Mice with BxPC-3 pancreatic, MCF-7 breast or A-549 NSCL cancer xenografts are administered PHT-427, or its analogs with a C-4, C-6 or C-8 alkyl chain by oral gavage twice a day for 10 days. The results show that PHT-427 has the greatest antitumor activity with the C-8 chain analog having less activity, and analogs with a C-4 or C-6 chain very little activity. All further antitumor studies are conducted using compound PHT-427. Plasma levels of PHT-427 following oral administration to mice of a dose of 200 mg/kg show rapid absorption, without a lag phase, Cmax is 8.2 µg/mL 1 hr following dosing, and the elimination half-life is 1.4 hr with a terminal PHT-427 concentration of 0.1 µg/mL 10 hr after dosing. The plasma concentration of PH-427 is above the level which gave inhibition of Akt and PDPK1 signaling in cells of 10 µM (4 µg/mL) for at least 3 hr[1].
[Cell Assay]
Panc-1 cells stably transfected with green fluorescent protein (GFP) tagged Akt or PDKP1 PH domains are serum starved in phenol red free growth medium on glass-bottom 96-well imaging plates for 16 hours. They are then treated with PHT-427 at 1, 5, and 10 µM or PI-103 for 4 hr, and stimulated with 50 ng/mL IGF-1 for 10 min. Images are taken before and after IGF-1 treatment using an IN Cell Analyzer 1000 instrument with a Nikon Plan Fluor ELWD 20X/0.45 objective loaded and using a 300msec exposure time[1].
[Animal admin]
Mice[1] Female C57Bl/6 mice are administered PHT-427 as a single oral dose of 200 mg/kg. The mice are killed at different times (3 mice at each time point), blood collected into heparinized tubes and plasma prepared and stored frozen at -80°C. For assay 0.2 mL plasma is mixed with 0.2 mL of 0.1 M sodium phosphate buffer, pH 4.0, and extracted for 1 hr by inversion with 1 ml ethyl acetate. After centrifugation 0.8 mL of the organic layer is removed, evaporated under N2 and redissolved in 0.2 mL ethanol and 10 µL injected onto a Waters Quattro Ultima tandem mass spectrometer using a Phenomenex Luna 3.0 µm, 2.0×50 mm C8 analytical column with detection and quantification by multiple reaction monitoring with the mass spectrometer operating in electrospray positive ionization mode.
[References]
[Related Small Molecules]