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    PI-103
    PI-103

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    This product is for research use only, not for human use. We do not sell to patients.
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    InvivoChem Cat #: V0107
    CAS #: 371935-74-9Purity ≥98%

    Description: PI-103 is a novel and potent multi-targeted PI3K inhibitor for p110α/β/δ/γ with IC50 of 2 nM/3 nM/3 nM/15 nM in cell-free assays, and has anticancer activity. It is less potent to mTOR/DNA-PK with IC50 of 30 nM/23 nM. PI-103 showed potent antiproliferation activities in various cancer cell lines such as prostate, ovary and glioblastoma. It exerted GI50 values of 0.14, 0.06, 0.13, 0.10, 0.12 and 0.08 μM in U87MG, IGROV-1, DETROIT-562, PC3, SKOV-3 and HUVEC cells, respectively.

    References: Mol Cancer Ther. 2009 Jul;8(7):1725-38.

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    Molecular Weight (MW)348.36
    FormulaC19H16N4O3
    CAS No.371935-74-9
    Storage-20℃ for 3 years in powder form
    -80℃ for 2 years in solvent
    Solubility (In vitro)DMSO: 24 mg/mL (68.9 mM)
    Water:<1 mg/mL (slightly soluble or insoluble)
    Ethanol: <1 mg/mL (slightly soluble or insoluble)
    Solubility (In vivo) 1% DMSO+30% polyethylene glycol+1% Tween 80: 30 mg/mL
    Chemical Name/Synonym3-(4-morpholin-4-ylpyrido[2,3]furo[2,4-b]pyrimidin-2-yl)phenol; PI103; PI-103; PI 103


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    In Vitro

    Kinase Assay: Enzyme Assays; Phosphatidylinositide 3-kinase inhibitory activity was determined using a scintillation proximity assay in the presence of 1 μmol/L ATP. Inhibition of mTOR protein kinase was determined using a TR-FRET-based LanthaScreen method from Invitrogen. Compounds were assayed at a maximum concentration of 10 μmol/L in the presence of 1 μmol/L ATP, and IC50 values were determined using GraphPad Prism software. 

     

    Cell Assay: U87MG cells are treated with PI-103 for 24 hours. Cell death is quantified by colorimetric determination of LDH activity using a cytotoxicity detection kit. Percentage of cell death (mean of three 12-well plates per experimental point) is calculated [(experimental value- low control)/(high control -low control) × 100], where the low-control cells are DMSO treated and high-control cells are Triton treated (1% Triton X-100, 30 min, 37 °; Concentration: 0.5 μM

    PI-103 potently inhibits both the rapamycin-sensitive (mTORC1) and rapamycin-insensitive (mTORC2) complexes of the protein kinase mTOR. PI-103 inhibits constitutive and growth factor-induced PI3K/Akt, as well as mTORC1 activation. In blast cells, PI-103 inhibits leukemic proliferation, the clonogenicity of leukemic progenitors and induces mitochondrial apoptosis, especially in the compartment containing leukemic stem cells. PI-103 inhibits p110α >200-fold more potently than p110β. PI-103 also potently blocks production of PI(3,4)P2 and PIP3 in adipocytes and PIP3 in myotubes. PI-103 inhibits phosphorylation of Akt with an IC95 100-fold lower than that for LY294002. Strikingly, PI-103 completely protects animals from insulin-stimulated decline in blood glucose. PI-103 has additive proapoptotic effects with etoposide in blast cells and in immature leukemic cells.

    In Vivo

    When tumors reach 50-100 mm3, animals are randomized and treated with vehicle or PI-103. PI-103 exhibits significant activity, decreasing average tumor size by 4-fold after 18 days. Mice treated with PI-103 have no obvious signs of toxicity premorbidly (based on body weight, food and water intake, activity, and general exam) or at necropsy. Treated tumors display decreased levels of phosphorylated Akt and S6, consistent with blockade of p110α and mTOR. PI-103 treatment is cytostatic to glioma xenografts.

    Animal model

    6- to 12-week-old Balbc nu/nu mice bearing U87MG:ΔEGFR cells

    Formulation & Dosage

    Solubilized in 50% DMSO; 5 mg/kg; i.p.

    References

    [1] Cell. 2006 May 19;125(4):733-47; [2] Cancer Cell. 2006 May;9(5):341-9.


    These protocols are for reference only. InvivoChem does not independently validate these methods.

    PI-103

    PI-103

    PI-103

    Cooperative inhibition of p110α and mTOR arrests growth of human glioma cells. Cancer Cell. 2006 May;9(5):341-9.

    PI-103

    Inhibition of p110α and of mTOR represents a safe and effective strategy in EGFR-driven glioma in vitro and in vivo. Cancer Cell. 2006 May;9(5):341-9.


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