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    Riviciclib (P276-00)
    Riviciclib (P276-00)

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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 #: V1549
    CAS #: 920113-02-6Purity ≥98%

    Description: Riviciclib (P276-00) is a flavonoid analog which acts as a novel inhibitor of CDK1 (cyclin-dependent kinase), CDK4 and CDK9 with IC50 of 79 nM, 63 nM and 20 nM, respectively.  P276-00 has the ability of arresting the cells in G1/S phase transcription. When tested with NSCLC cell lines, P276-00 showed high ability of inhibiting cell proliferate thus decreased the colony forming potential via blocking cell cycle. In head and neck squamous carcinoma cell line (FaDu, Detroits-562, SCC-25), treated with P276-00 for 12 hours could significantly inhibit cell ability with IC50 value ranging from 0.8 to 1.7 uM for different cell lines via decreasing the expression of CCND1.

    References: Mol Cancer Ther. 2007 Mar;6(3):918-25; Mol Cancer Ther. 2007 Mar;6(3):926-34.

    Related CAS #: 920113-03-7 (HCl)   920113-02-6 (free base)    

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    Molecular Weight (MW)401.84
    FormulaC21H20ClNO5
    CAS No.920113-02-6 
    Storage-20℃ for 3 years in powder form
    -80℃ for 2 years in solvent
    Solubility (In vitro)DMSO: 88 mg/mL (200.8 mM) 
    Water: 88 mg/mL (200.8 mM) 
    Ethanol: 7 mg/mL (16.0 mM)
    Solubility (In vivo)30% Propylene glycol, 5% Tween 80, 65% D5W: 30mg/mL 
    SynonymsP-27600; P 27600; P27600; P276-00; P-276-00; P 276-00; Riviciclib HCl


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    In Vitro

    In vitro activity: P276-00 shows 40-fold selectivity toward Cdk4-D1, compared with Cdk2-E. It shows potent antiproliferative effects against various human cancer cell lines, including HCT-116, U2OS, H-460, HL-60, HT-29, SiHa, MCF-7, Colo-205, SW-480, PC-3, Caco2, T-24 with an IC50 ranging from 300 to 800 nmol/L, and is found to be highly selective for cancer cells as compared with normal fibroblast cells. P276-00 can down-regulate cyclin D1 and Cdk4 in an ATP- competitive manner and decrease Cdk4-specific pRb Ser780 phosphorylation. P276-00 also induces apoptosis by actving cellular caspase-3 activity and DNA ladder formation.


    Kinase Assay: The Cdk4-D1/Cdk2-E enzyme assay is run in 96-well format using Millipore Multiscreen filtration plates. All assay steps are done in a single filter plate. The filtration wells are prewetted with 100 μL of kinase buffer [50 mmol/L HEPES (pH, 7.5), 10 mmol/L MgCl2, 1 mmol/L EGTA], and then the solution is removed by vacuum. With filter plate on vacuum manifold, 50 μL GST-Rb bound to GSH-Sepharose beads in kinase buffer (0.5 μg GST-Rb/50 μL) is added to each well, and vacuum is applied to the filter plate. About 25 μL of a reaction mix containing ATP (cold + hot) and 4× phosphatase inhibitor mix (40 μmol/L unlabeled ATP, 10 μCi/mL γ32P-ATP, 40 mmol/L h-glycerophosphate, 4 mmol/L DTT, 0.4 mmol/L NaF, 0.4 mmol/L sodium orthovanadate) diluted in kinase buffer is added to each well. The test compound (4×final concentration in kinase buffer) or kinase buffer alone (control) is then added in an additional 25 μL volume. To each well, 50 μL (100 ng) of human Cdk4-D1/Cdk2-E enzyme in kinase buffer is added to initiate the reaction, which is allowed to continue for 30 min at 30°C. When the reaction is completed, vacuum is applied again, and the plate is washed with the TNEN buffer [20 mmol/L Tris (pH, 8.0), 100 mmol/L NaCl, 1 mmol/L EDTA, 0.5% nonidet-P40] thrice; the filter plate is air-dried and is placed in a Multiscreen adapter plate. Packard Microscint-O cocktail (30 μL) is added, and the plate is covered with a Top-Seal A film. Quantitation of 32P-GST-Rb in 96-well filter plates is carried out by Top Count scintillation counter. All compounds are tested initially at 1 μmol/L concentration. Compounds showing more than or equal to 50% inhibition are further profiled for IC50 determination. 


    Cell Assay: The cells (HCT-116, U2OS, H-460, HL-60, HT-29, SiHa, MCF-7, Colo-205, SW-480, PC-3, Caco2, T-24) are seeded at a density of 3,000-5,000 cells per well, depending on cell type in 180 μL of culture medium in 96-well plate and incubated overnight to allow the cells to adhere. Varying concentrations of compounds are added to the wells and incubated for 48 h at 37°C. 3H-thymidine (0.25 μCi) is added to each well, and incorporation of the radiolabel is allowed to proceed for 5 to 7 h. Following this incubation, cells are harvested onto GF/B unifilter plates using a Packard Filtermate Universal harvester, and the plates are counted in a Packard Top Count 96-well liquid scintillation counter. 

    In VivoP276-00, administered i.p. at 50 mg/kg daily for 20 treatments can significantly induce growth inhibition of murine colon cancer (CA-51). However, in murine lung carcinoma model (Lewis lung), an increased dose of 60 mg/kg (30 mg/kg twice daily) administered every alternate day i.p. for 7 treatments shows significant inhibition in the growth. And it also inhibit the growth of human colon carcinoma HCT-116 xenograft and human non-small cell lung carcinoma H-460 xenograft. Efficacy Studies show its maximum tolerated dose is 78 mg/kg/d. 
    Animal modelH-460 xenograft 
    Formulation & DosageDissolved in water; 50 mg/kg once daily or 30 mg/kg twice daily; i.p. injection
    References

    Mol Cancer Ther. 2007 Mar;6(3):918-25; Mol Cancer Ther. 2007 Mar;6(3):926-34.


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

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