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Flavopiridol

产品号 S1230 公司名称 Selleck Chemicals
CAS号 146426-40-6 公司网站 http://www.selleckchem.com
分子式 C21H20ClNO5 电 话 (877) 796-6397
分子量 401.8402 传 真 (832) 582-8590
纯 度 电子邮件 sales@selleckchem.com
保 存 -20°C Chembase数据库ID: 3170

产品价格信息

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产品别名

标题
Flavopiridol
IUPAC标准名
2-(2-chlorophenyl)-5,7-dihydroxy-8-[(3S,4R)-3-hydroxy-1-methylpiperidin-4-yl]-4H-chromen-4-one
IUPAC传统名
flavopiridol
别名
L868275
HMR-1275
Alvocidib

产品登记号

CAS号 146426-40-6

产品性质

作用靶点 CDK
成盐信息 Free Base
保存条件 -20°C

产品详细信息

详细说明 (English)
Biological Activity
Description Flavopiridol (Alvocidib, HMR-1275, L86-8275) is a pan-CDK inhibitor targeting CDK1, CDK2, CDK4, CDK5, CDK6 and CDK9 with IC50 of 30 nM, 170 nM, 100 nM, 170 nM, 80 nM and 20 nM, respectively.
Targets

CDK1/Cyclin B1

CDK2/Cyclin E

CDK4/Cyclin D1

CDK5/p25

CDK6/Cyclin

CDK9/Cyclin T

IC50

30 nM

170 nM

100 nM [1]

170 nM

80 nM [2]

20 nM [3]

In Vitro Flavopiridol displays less activity against unrelated kinases such as MAP, PAK, PKC, and EGFR with IC50 of >14 μM. Flavopiridol significantly inhibits the colony growth of HCT116, A2780, PC3, and Mia PaCa-2 cells with IC50 of 13 nM, 15 nM, 10 nM and 36 nM, respecitively. [1] Flavopiridol also potently inhibits the activity of Glycogen synthase kinase-3 (GSK-3) with an IC50 of 280 nm. [2] Compared with other CDKs, Flavopiridol inhibits the activity of CDK7 less potently with IC50 of 875 nM. Flavopiridol (0.5 μM) inhibits both pSer807/811 Rb and pThr199 NPM, whereas mild changes are observed at pThr821 Rb. Flavopiridol also decreases the overall RNA polymerase II level, as well as the phosphorylation of RNA polymerase II on the CTD repeats at Ser2 Ser5. [3] As a broad spectrum CDK inhibitor, Flavopiridol can inhibit cell cycle progression in either G1 or G2. Flavopiridol (0.3 μM) induces G1 arrest in either MCF-7 or MDA-MB-468 cells by inhibition of the CDK4 or CDK2 kinase activity. [4] Flavopiridol exhibits potent cytotoxicity against a wide variety of tumor cell lines with IC50 values ranging form 16 nM for LNCAP to 130 nM for K562. [5]
In Vivo Administration of Flavopiridol at 7.5 mg/kg for 7 days displays slight antitumor activity against P388 murine leukemia, resulting in %T/C value of 110, and active against the human A2780 ovarian carcinoma implanted sc in nude mice, producing 1.5 log cell kill (LCK). [5] Flavopiridol treatment at 1-2.5 mg/kg for 10 days significantly suppresses collagen-induced arthritis in mice in a dose-dependent manner, by inhibiting synovial hyperplasia and joint destruction, whereas serum concentrations of anti-collagen type II (CII) Abs and proliferative responses to CII are maintained. [6] In the p21-intact Hct116 xenografts in nude mice, administration of CPT-11 (100 mg/kg) followed by Flavopiridol (3 mg/kg) 7 and 16 hours later significantly inhibits tumor regression by 86% and 82%, respectively, displaying >2 fold inhibition compared with CPT-11 alone by 40 %. The combination produces ~30% complete response rate (CR) in contrast to CPT-11 alone where no CR is found. [7]
Clinical Trials A Phase I/II study of Flavopiridol to treat relapsed mantle cell lymphoma or diffuse large B-cell lymphoma has been completed.
Features First CDK inhibitor in human clinical trials.
Combination Therapy
Description A phase I study of Vorinostat (SAHA) in combination with Flavopiridol in treating patients with advanced solid tumors has been completed.
Protocol
Kinase Assay [1]
CDK kinase assay For CDK1/cyclin B1 kinase assay, kinase reactions consist of 100 ng of baculovirus expressed GST-CDK1/cyclin B1 (human) complex, 1 μg histone HI, 0.2 μCi [γ-33P]ATP, 25 μM ATP in 50 μL kinase buffer (50 mM Tris, pH 8.0, 10 mM MgCl2, 1 mM EGTA, 0.5 mM DTT). For CDK2/cyclin E kinase assay, kinase reactions consist of 5 ng of baculovirus expressed GST-CDK2/cyclin E (human) complex, 0.5 μg GST-RB fusion protein (amino acids 776-928 of retinoblastoma protein), 0.2 μCi [γ-33P]ATP, 25 μM ATP in 50 μL kinase buffer (50 mM Hepes, pH 8.0, 10 mM MgCl2, 1 mM EGTA, 2 mM DTT). For CDK4/cyclin D1 kinase assay, kinase reactions consist of 150 ng of baculovirus expressed GST-CDK4/cyclin D1 (human), 280 ng of Stag-cyclin D1, 0.5 μg GST-RB fusion protein (amino acids 776-928 of retinoblastoma protein), 0.2 μCi [γ-33P]ATP, 25 μM ATP in 50 μL kinase buffer (50 mM Hepes, pH 8.0, 10 mM MgCl2, 1 mM EGTA, 2 mM DTT). Reactions are incubated for 45 minutes for CDK1 and CDK2, or 1 hour for CDK4 at 30 °C and stopped by the addition of cold trichloroacetic acid (TCA) to a final concentration 15%. TCA precipitates are collected onto GF/C unifilter plates using a Filtermate universal harvester and the filters are quantitated using a TopCount 96-well liquid scintillation counter. Flavopiridol is dissolved at 10 mM in dimethylformamide (DMF) and evaluated at six concentrations, each in triplicate. The final concentration of DMF in the assay = 2%. IC50 values are derived by nonlinear regression analysis and have a coefficient of variance = 16%. To assay Flavopiridol activity on CDK6, a filter-binding assay is established. The following are combined in the reaction mixture: 2 μL of CDK6 (0.7 mg/μL), 5 μL of histone H1 (6 mg/mL), 14 μL of kinase buffer (60 mM β-glycerophosphate, 30 mM p-nitrophenyl phosphate, 25 mM MOPS (pH 7.0), 5 mM EGTA, 15 mM MgCl2, 1 mM DTT, 0.1 mM Na-vanadate), 3 μL of increasing concentrations of Flavopiridol diluted in 50% DMSO, and 6 μL of 33P-ATP (1 mCi/mL) in nonradioactive ATP at 90 μM concentration (final concentration: 15 μM). The assay is initiated by the addition of 33P-ATP. The reaction is incubated for 20 minutes at 30°C. A 25 μL aliquot of the supernatant is then spotted onto Whatman P81 phosphocellulose paper. Filters are washed 5 times with 1% phosphoric acid solution. Wet filters are counted in the presence of 1 mL of scintillation fluid. Cdk9 activity is measured using 50 nM of recombinant Cdk9/cyclin T in 50 mM HEPES pH 7.5, 10 mM MgCl2, 1 mM DTT, 3 μM Na3VO4, 150 μM RNA polymerase CDT peptide and 80 μM ATP. Cdk7 assay is performed in the same buffer using 37 nM of purified kinase in the presence of 200 μM ATP and 10 μM myelin binding protein as a substrate. The potency of Flavopiridol toward CDK9 and CDK7 is determined using either a strong anion exchanger (Dowex 1-X8 resin, formate form)-based assay or a scintillation proximity assay. IC50 values are calculated from the dose-response curves.
Cell Assay [5]
Cell Lines MCF-7, LNCAP, PC3, HCT116, CACO-2, A549, HL60, K562 cells and et al.
Concentrations Dissolved in DMSO, final concentrations ~10 μM
Incubation Time 72 hours
Methods

Cells are exposed to various concentrations of Flavopiridol for 72 hours at which time the tetrazolium dye, MTS in combination with phenazine methosulfate, is added. After 3 hours, the absorbency is measured at 492 nm, which is proportional to the number of viable cells. The results are expressed as IC50 values. For cell Cycle analysis, cells are fixed in paraformaldehyde and ethanol, washed, resuspended in staining solution of TdT enzyme and FITC-dUTP, washed, stained with PI following RNase treatment, and then analyzed by flow cytometry.

Animal Study [5]
Animal Models Female Balb/c×DBA/2J F1 mice inoculated ip with P388 ascites leukemic cells, and Balb/c nu/nu nude mice subcutaneous implanted with A2780, Br-cycE, or A431 cells
Formulation Dissolved in a mixture of Cremophor/ethanol (50:50), and diluted in water
Doses ~7.5 mg/kg/day
Administration Injection i.p.
References
[1] Kim KS, et al. J Med Chem, 2000, 43(22), 4126-4134.
[2] Lu H, et al. J Med Chem, 2005, 48(3), 737-743.
[3] Montagnoli A, et al. Nat Chem Biol, 2008, 4(6), 357-365.
[4] Carlson BA, et al. Cancer Res, 1996, 56(13), 2973-2978.
[5] Kim KS, et al. J Med Chem, 2002, 45(18), 3905-3927.
[6] Sekine C, et al. J Immunol, 2008, 180(3), 1954-1961.
[7] Motwani M, et al. Clin Cancer Res, 2001, 7(12), 4209-4219.