Catalog No.S8058

P276-00 Chemical Structure

Molecular Weight(MW): 438.3

P276-00 is a novel CDK1, CDK4 and CDK9 inhibitor with IC50 of 79 nM, 63 nM and 20 nM, respectively. Phase 2/3.

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  • Predicted anticancer drugs inhibit the growth of neuroendocrine tumor cells. Multi-tyrosine kinase inhibitors sorafenib, sunitinib, regorafenib and cabozantinib effectively inhibit GOT1 cell growth with IC50 values in the micromolar range. Inhibitors of AKT (MK-2206), HDAC (vorinostat), HSP90 (alvespimycin) and CDK4/9 (P276-00) also inhibited GOT1 cell growth at micromolar concentrations, whereas inhibition of PARP1 (veliparib) had no effect. GOT1 cells were treated with anticancer drugs at various concentrations for 4 days. Cell viability was estimated using AlamarBlue®. Data points are the mean values of three individual experiments carried out in triplicate (n=9). Fitting of curves was done in GraphPad Prism software v6.04 using log (inhibitor) vs response nonlinear fit with variable slope. IC50 was interpolated at Y=50 and bars denote ±s.d.

    Mod Pathol, 2016, 29(6):616-29. . P276-00 purchased from Selleck.

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Choose Selective CDK Inhibitors

Biological Activity

Description P276-00 is a novel CDK1, CDK4 and CDK9 inhibitor with IC50 of 79 nM, 63 nM and 20 nM, respectively. Phase 2/3.
CDK9/CyclinT1 [1] CDK4/CyclinD1 [1] CDK1/CyclinB [1] CDK2/CyclinA [1] CDK6/CyclinD3 [1]
20 nM 63 nM 79 nM 224 nM 396 nM
In vitro

P276-00 shows 40-fold selectivity toward Cdk4-D1, compared with Cdk2-E[1]. 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[1]. 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[1].

In vivo P276-00, 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[2]. And it also inhibit the growth of human colon carcinoma HCT-116 xenograft and human non-small cell lung carcinoma H-460 xenograft[2]. Efficacy Studies show its maximum tolerated dose is 78 mg/kg/d[2].


Kinase Assay:[1]
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Cdk4-D1/Cdk2-E enzyme 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 Research:[1]
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  • Cell lines: HCT-116, U2OS, H-460, HL-60, HT-29, SiHa, MCF-7, Colo-205, SW-480, PC-3, Caco2, T-24
  • Concentrations: ~5.0 μM
  • Incubation Time: 48 h
  • Method: The cells 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.
    (Only for Reference)
Animal Research:[2]
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  • Animal Models: H-460 xenograft
  • Formulation: water
  • Dosages: 50 mg/kg once daily or 30 mg/kg twice daily
  • Administration: i.p.
    (Only for Reference)

Solubility (25°C)

In vitro DMSO 88 mg/mL (200.77 mM)
Water 88 mg/mL (200.77 mM)
Ethanol 7 mg/mL (15.97 mM)
In vivo Add solvents individually and in order:
30% propylene glycol, 5% Tween 80, 65% D5W
30 mg/mL

* Please note that Selleck tests the solubility of all compounds in-house, and the actual solubility may differ slightly from published values. This is normal and is due to slight batch-to-batch variations.

Chemical Information

Molecular Weight 438.3


CAS No. 920113-03-7
Storage powder
Synonyms N/A

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Clinical Trial Information

NCT Number Recruitment Conditions Sponsor/Collaborators Start Date Phases
NCT01903018 Completed Radiation Induced Mucositis in Head and Neck Cancer Piramal Enterprises Limited July 2012 Phase 2
NCT01333137 Terminated Breast Cancer Piramal Enterprises Limited August 2011 Phase 1
NCT00843050 Terminated Mantle Cell Lymphoma Piramal Enterprises Limited November 2009 Phase 2
NCT00899054 Completed Squamous Cell Carcinoma of Head and Neck Piramal Enterprises Limited August 2009 Phase 1|Phase 2
NCT00898287 Completed Pancreatic Cancer Piramal Enterprises Limited May 2009 Phase 1|Phase 2
NCT00835419 Completed Melanoma Piramal Enterprises Limited May 2009 Phase 2

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Answers to questions you may have can be found in the inhibitor handling instructions. Topics include how to prepare stock solutions, how to store inhibitors, and issues that need special attention for cell-based assays and animal experiments.

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CDK Signaling Pathway Map

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Cell Lines Assay Type Concentration Incubation Time Formulation Activity Description PMID