Molecular Weight(MW): 460.57
Milciclib (PHA-848125) is a potent, ATP-competitive CDK inhibitor for CDK2 with IC50 of 45 nM. It is >3-fold more selective for CDK2 than CDK1, 2, 4, 5, and 7. Phase 2.
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|Description||Milciclib (PHA-848125) is a potent, ATP-competitive CDK inhibitor for CDK2 with IC50 of 45 nM. It is >3-fold more selective for CDK2 than CDK1, 2, 4, 5, and 7. Phase 2.|
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.
|In vivo||In 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.|
Biochemical kinase inhibition assays: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.
|In vitro||DMSO||92 mg/mL (199.75 mM)|
|In vivo||30% propylene glycol, 5% Tween 80, 65% D5W||30 mg/mL|
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Clinical Trial Information
|NCT Number||Recruitment||Conditions||Sponsor/Collaborators||Start Date||Phases|
|NCT01301391||Recruiting||Malignant Thymoma||Tiziana Life Sciences, PLC||January 2011||Phase 2|
|NCT01011439||Active, not recruiting||Thymic Carcinoma||Tiziana Life Sciences, PLC||March 2009||Phase 2|
|NCT01300468||Completed||Solid Tumour||Nerviano Medical Sciences||April 2006||Phase 1|
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