Molecular Weight(MW): 570.65
PKI-402 is a potent dual pan-PI3K/mTOR inhibitor targeting PI3Kα/β/γ/δ and mTOR with IC50 of 2 nM/7 nM/16 nM/14 nM and 3 nM, respectively; also potent to PI3Kα mutants E545K and H1047R.
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|Description||PKI-402 is a potent dual pan-PI3K/mTOR inhibitor targeting PI3Kα/β/γ/δ and mTOR with IC50 of 2 nM/7 nM/16 nM/14 nM and 3 nM, respectively; also potent to PI3Kα mutants E545K and H1047R.|
Equivalent to the IC50 for wild-type PI3Kα, PKI-402 inhibits E545K and H1047R PI3Kα mutants with IC50 of 3 nM. In a panel of 236 human protein kinases, PKI-402 only displays inhibitory activity against C-Raf and B-Raf with IC50 of 7 μM, and displays little activity against all other kinases with IC50 of > 10 μM. PKI-402 inhibits the growth of human tumor cell lines with IC50 of 6-349 nM. Consistently, PKI-402 inhibits phosphorylation of PI3K and mTOR effector proteins, particularly phosphorylated Akt (p-Akt) at T308 and S473 with IC50 of <10 nM and <30 nM, respectively. PKI-402 inhibits both p70S6K and 4EBP1 phosphorylation with IC50 of <10 nM. PKI-402 inhibits Akt phosphorylation of PRAS40 at T246 with IC50 of <30 nM, and inhibits Akt phosphorylation of ENOS at S1177 and GSK3α/GSK3β at S9/S21 with IC50 of <10 nM. In MDAMB-361, a breast tumor line with mutant PI3K-α (E545K) and elevated levels of Her2 receptor, PKI-402 treatment induces cleaved poly(ADP-ribose) polymerase (PARP), a marker for apoptosis. Less than 10% of MDAMB-361 cells exposed to PKI-402 at 0.3 μM (or higher) for 24 hours remain viable. 
|In vivo||Single dose of PKI-402 (100 mg/kg) suppresses Akt phosphorylation (at T308) and induces cleaved PARP in MDA-MB-361 tumors. In normal tissue (heart and lung), PKI-402 (100 mg/kg) has minimal effect on p-Akt, with no detectable cleaved PARP. Consistently, PKI-402 at 100 mg/kg (daily for 5 days, one round) reduces initial tumor volume of 260 mm3 to 129 mm3 and prevents tumor regrowth for 70 days in MDA-MB-361. PKI-402 significantly inhibits the growth of A549 tumors in nude mice at 25 mg/kg and 50 mg/kg. PKI-402 at 100 mg/kg (daily for 5 days, one round) causes significant (P < 0.01) reduction in tumor growth of U87MG. |
Fluorescence polarization format assay:Enzyme assays are done in fluorescent polarization (FP) format, adapted from the Echelon K-1100 PI3K FP assay kit protocol. Assay reaction buffer is 20 mM Hepes, pH 7.5, 2 mM MgCl2, 0.05% CHAPS, and 0.01% βME. Assay STOP/detection buffer is 100 mM Hepes, pH 7.5, 4 mM EDTA, 0.05% CHAPS. FP assays are run in Nunc 384-well black polypropylene fluor plates. The FP reaction is run in 20 μL of reaction buffer containing 20 μM PIP2, 25 μM ATP, and >4% DMSO. The reaction is run for 30 minutes at room temp. The reaction is stopped with 20 μL of STOP/detection buffer containing 10 nM probe and 40 nM GST-GRP. Assay plates are incubated for 2 hours, and fluorescence polarization is measured in a Perkin-Elmer Envision plate reader with TAMRA-FP filters.
|In vitro||DMSO||0.4 mg/mL (0.7 mM)|
|In vivo||Add solvents individually and in order:
30% PEG400+0.5% Tween80+5% propylene glycol
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