Molecular Weight(MW): 416.99
BS-181 HCl is a highly selective CDK7 inhibitor with IC50 of 21 nM. It is more than 40-fold selective for CDK7 than CDK1, 2, 4, 5, 6, or 9.
2 Customer Reviews
Relative sensitivity of UKF-NB-3 and UKF-NB-3rSNS-032300nM to the CDK2, 7, and 9 inhibitor seliciclib, the CDK7 inhibitor LDC000067, the CDK9 inhibitor BS-181, or the CDK 1,2,4,6,7, and 9 inhibitor alvocidib.
Oncotarget, 2016, 7(36):58051-58064. BS-181 HCl purchased from Selleck.
Dose-response inhibition of purified human recombinant cyclin-dependent kinase CDK7/cyclin H by inhibitor BS-181 (left panel). Immunoblotting of RNA polymerase II and its phosphorylated form (at Ser5), physiological substrate of CDK7, in MCF-7 cells treated with different doses of inhibitor BS-181 for 24 h (right panel).
Dr. Vladimir Krystof of Palacky University. BS-181 HCl purchased from Selleck.
Purity & Quality Control
Choose Selective CDK Inhibitors
|Description||BS-181 HCl is a highly selective CDK7 inhibitor with IC50 of 21 nM. It is more than 40-fold selective for CDK7 than CDK1, 2, 4, 5, 6, or 9.|
|Features||Demonstrates higher inhibitory selectivity for CDK7 vs. other CDKs and kinases from other classes.|
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. 
|In vivo||BS-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. |
In vitro kinase inhibition.: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.
|In vitro||DMSO||83 mg/mL (199.04 mM)|
|Ethanol||22 mg/mL warmed (52.75 mM)|
|Water||3 mg/mL (7.19 mM)|
|In vivo||Add solvents to the product individually and in order(Data is from Selleck tests instead of citations):
1% DMSO+30% polyethylene glycol+1% Tween 80
For best results, use promptly after mixing.
* 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.
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* When preparing stock solutions always use the batch-specific molecular weight of the product found on the vial label and MSDS / COA (available online).
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