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    BS-181 HCl
    BS-181 HCl

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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 #: V1553
    CAS #: 1397219-81-6 Purity ≥98%

    Description: BS-181 HCl (BS181; BS 181), the hydrochloride salt of BS181, is a novel, highly selective, and small molecule Cyclin-dependent kinase 7 (CDK7) inhibitor with potential antitumor activity. It inhibits CDK7 with an IC50 of 21 nM in a cell-free assay. It is more than 40-fold selective for ihibiting CDK7 over CDK1, 2, 4, 5, 6, or 9.  

    References: Cancer Res. 2009 Aug 1;69(15):6208-15.

    Related CAS#: 1092443-52-1 (free base); 1397219-81-6 (HCl); 1883548-83-1 (2HCl) 

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    Molecular Weight (MW)416.99 
    CAS No.1397219-81-6 (HCl)
    Storage-20℃ for 3 years in powder form
    -80℃ for 2 years in solvent
    Solubility (In vitro)DMSO: 83 mg/mL (199.0 mM) 
    Water: 3 mg/mL (7.2 mM)
    Ethanol: 22 mg/mL warmed (52.8 mM) 
    Solubility (In vivo)1% DMSO+30% polyethylene glycol+1% Tween 80: 30 mg/mL 
    SynonymsBS181; BS-181 HCl; BS-181; BS 181; BS-181 hydrochloride

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    In Vitro

    In vitro activity: BS-181 is a small molecule inhibitor of CDK7 in a cell-free environment, which displays more potential activity than roscovitine with IC 50 of 510 nM. Among the CDKs and other 69 kinases from many different classes, BS-181 shows high inhibitory selectivity for CDK7, inhibits CDK2 at concentrations lower than 1 μM which being inhibited 35-fold less potently (IC50 with 880 nM) than CDK7, shows slight inhibition for CDK1, CDK4, CDK5, CDK6 and CDK9 with IC50 values higher than 3.0 μM, and only shows inhibition for several kinases from other classes at high concentrations (>10 μM). BS-181 promotes cell cycle arrest and inhibits the cancer cell growth of a range of tumor types, including breast, lung, prostate and colorectal cancer with IC50 in the range of 11.5-37 μM. In MCF-7 cells, BS-181 inhibits the phosphorylation of the CDK7 substrate RNA polymerase II COOH-terminal domain (CTD), and promotes cell cycle arrest and apoptosis to inhibit the growth of cancer cell lines.

    Kinase Assay: Inhibition of CDK7 activity is measured by incubation of increasing amounts of BS-181 with purified recombinant CDK7/CycH/MAT1 complex, followed by measurement of free ATP remaining in the reaction using a luciferase assay, luciferase activity therefore providing a measure of inhibition of CDK7 activity for the determination of IC50. 

    Cell Assay: MCF-7 cells are exposed to BS-181 for 24 hours. For the determination of cell cycle and apoptosis, cells are stained with propidium iodide or labeled with Annexin V-FITC, then labeled cells are acquired within 1 hour, by using the RXP cytomics software on a Beckman Coulter Elite ESP, and the data are analyzed using Flow Jo v7.2.5. For the assessment of CDKs, cells are lysed and analyzed by western blotting.

    In VivoBS-181 is stable in vivo with a plasma elimination half-life in mice of 405 minutes after i.p. administration of 10 mg/kg. BS-181 inhibits the growth of MCF-7 xenografts in the nude mice model in a dose-dependent manner, with 25% and 50% reduction in tumor growth after 2 weeks of treatment at 10 mg/kg/day and 20 mg/kg/day, respectively without apparent toxicity. 
    Animal modelMCF-7 cells are established in female nu/nu-BALB/c athymic nude mice 
    Formulation & DosageDissolved in the vehicle of 10% DMSO / 50 mM HCl / 5% Tween 20 / 85% saline; 10 or 20 mg/kg; i.p. injection

    Cancer Res. 2009 Aug 1;69(15):6208-15.

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

    BS-181 HCl

    BS-181 inhibits phosphorylation of CDK7 substrates. Cancer Res. 2009 Aug 1;69(15):6208-15.


    BS-181 HCl

    Cancer Res. 2009 Aug 1;69(15):6208-15.

    BS-181 HCl

    BS-181 inhibits the growth of MCF-7 tumors in nude mice. Cancer Res. 2009 Aug 1;69(15


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