Biological Activity
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.
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].
References & source
Published experimental findings depend on the model and assay conditions. They do not guarantee equivalent performance in every application. For laboratory research use only.
