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    Milciclib (PHA-848125)
    Milciclib (PHA-848125)

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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 #: V1556
    CAS #: 802539-81-7Purity ≥98%

    Description: Milciclib (formerly also known as PHA-848125) is a novel, potent, ATP-competitive small molecule CDK inhibitor for CDK2 with IC50 of 45 nM. It is >3-fold more selective for CDK2 than CDK1, 2, 4, 5, and 7. It is also an inhibitor of Tropomyosin receptor kinase (TRK), with IC50 of 53 nM. In cells treated with PHA-848125, hyperphosphorylated form of CDK substrate—retinoblastoma protein (pRb) was reduced and hypophosporylated from of pRb was accumulated. It further indicated inhibition effect of PHA-848125 on CDK2 activity.

    References: J Med Chem. 2009 Aug 27;52(16):5152-63; Mol Cancer Ther. 2010 Mar;9(3):673-81.

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    Molecular Weight (MW)460.57 
    FormulaC25H32N8O 
    CAS No.802539-81-7 
    Storage-20℃ for 3 years in powder form
    -80℃ for 2 years in solvent
    Solubility (In vitro)DMSO: 92 mg/mL (199.8 mM) 
    Water: <1 mg/mL
    Ethanol: <1 mg/mL
    Solubility (In vivo)30% Propylene glycol, 5% Tween 80, 65% D5W: 30 mg/mL
    SynonymsPHA-848125; PHA848125; PHA 848125; PHA-848125AC; PHA 848125AC; PHA848125AC


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    In Vitro

    In vitro activity: PHA-848125 inhibits, although with lower potency, the activities of cyclin H/CDK7, cyclin D1/CDK4, p35/CDK5, as well as cyclin E/CDK2 and cyclin B/CDK1 with IC50 values of 0.15, 0.16, 0.265, 0.363, 0.398 μM, respectively. Thropomyosin receptor kinase A is also inhibited by PHA-848125 in the same nanomolar range as CDKs. In the most PHA-848125-sensitive cell line, PHA-848125 induces a concentration-dependent G(1) arrest. PHA-848125 also impairs phosphorylation of the retinoblastoma protein at CDK2 and CDK4 specific sites, reduces retinoblastoma protein and cyclin A levels, and increases p21(Cip1), p27(Kip1) and p53 expression. PHA-848125 is added to the cells 48 h after TMZ and cell growth is evaluated after 3 additional days of culture. A drug combination of TMZ, BG and PHA-848125 induces an additive or synergistic effect on cell growth, depending on the cell line. In the absence of BG, the combination is still more active than the single agents in cell lines moderately sensitive to TMZ, but comparable to PHA-848125 alone in the two TMZ-resistant cell lines. When TMZ plus BG are used in combination with PHA-848125 against cultured normal melanocytes, neither synergistic nor additive antiproliferative effects are observed.


    Kinase Assay: Inhibition of kinase activity by PHA-848125 is assessed using a strong anion exchanger (Dowex 1X8 resin)–based assay in robotized format run on 384-well plates. In this assay, specific peptides or protein substrates are transphosphorylated by their specific kinase in the presence of ATP traced with [γ-33P]ATP using optimal buffers and cofactors. The potency of PHA-848125 toward CDKs and 38 additional kinases belonging to an in-house Kinase Selectivity Screening panel is evaluated, and the relevant IC50s are determined. For each enzyme, the absolute KM values for ATP and the specific substrate are calculated and each assay is then run at optimized ATP (2KM) and substrate (5KM) concentrations. This setting enables direct comparison of IC50 values of PHA-848125 across the panel for evaluation of its biochemical profile. 


    Cell Assay: Melanoma cells are suspended in culture media at a concentration of 2 × 104 cells/mL, dispensed in 50 μL aliquots into flat-bottom 96-well plates and allowed to adhere overnight at 37 °C. Graded amounts of PHA-848125 or TMZ are then added to the wells (4 wells per point) in 50 μL of CM and the plates are incubated at 37 °C in a 5% CO2 humidified atmosphere for 5 days. The cytotoxic effects of TMZ are also evaluated in combination with the MGMT inhibitor BG. To this end, 10 μM BG is added to the plates 2 hours before TMZ and left in culture for the entire period of cell exposure to the drug. ContS1017rol groups are represented by untreated cells and cells treated with BG or DMSO alone. The growth of the cells treated with BG or DMSO alone does not differ from that of untreated cells. MGMT activity of BG-treated cells is undetectable 2 hours after the addition of the inhibitor PHA-848125 and remained essentially undetectable up to the end of the assay. Normal melanocytes are suspended in MGM at the concentration of 1.6 × 105 cells/mL, plated (50 μL/well) and exposed to TMZ + BG or to PHA-848125 as described for melanoma cells. At the end of the incubation period, cell growth is evaluated by the MTT assay. Briefly, 0.1 mg of MTT (in 20 μL of PBS) is added to each well and cells are incubated at 37 °C for 4 hours. Cells are then lysed with a buffer (0.1 mL/well) containing 20% SDS and 50% N,N-dimethylformamide, pH 4.7. After overnight incubation, the absorbance is read at 595 nm using a 3550-UV microplate reader. Cell sensitivity to drug treatment is expressed in terms of IC50 (drug concentration producing 50% inhibition of cell growth, calculated on the regression line in which absorbance values at 595 nm are plotted against the logarithm of drug concentration).

    In VivoIn the preclinical xenograft A2780 human ovarian carcinoma model, PHA-848125 reveals good efficacy and is well tolerated upon repeated daily treatments. Treatment of K-Ras(G12D)LA2 mice with PHA-848125 (40 mg/kg twice daily for 10 days) results in significant tumor growth inhibition at the end of the treatment and is accompanied by a reduction in the cell membrane turnover. On the other hand, following oral administration, PHA-848125 shows significant antitumor activity in various human xenografts, carcinogen-induced tumors and in disseminated primary leukemia models; the plasma concentrations in rodents being in the same range as those found inhibiting cancer cell proliferation. 
    Animal modelK-Ras(G12D)LA2 mice
    Formulation & DosageFormulated in 5% dextrose solution; 40 mg/kg twice daily for 10 days; p.o.
    References

    J Med Chem. 2009 Aug 27;52(16):5152-63; Mol Cancer Ther. 2010 Mar;9(3):673-81. 


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

    Milciclib (PHA-848125)


    Mechanism of action of PHA-848125 by immunohistochemistry analysis.

    Milciclib (PHA-848125)

    Histologic validation of MRI data and characterization of lesions.  2010 Mar;9(3):673-81.

     

    Milciclib (PHA-848125)

    MRI efficacy study. A, representative MR images in a control (top) and treated (bottom) animal pretreatment (day 0) and posttreatment (day 11). B, % tumor growth for control and treated groups;  2010 Mar;9(3):673-81.

     Milciclib (PHA-848125)


    11C-Cho PET efficacy study. Cho-PET images of a treated (A) and control (B) mice.

    Milciclib (PHA-848125)

    K-RasG12DLA2 model characterization by MRI.  2010 Mar;9(3):673-81.


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