BMS345541 hydrochloride (Synonyms: IKK Inhibitor III)

Enzyme Assays

Assays measuring the enzyme-catalyzed phosphorylation of GST-IκBα were performed by adding enzyme (IKK-2, IKK-1 or IKK-ε, typically to a final concentration of 0.5 μg/mL) at 30℃ to solutions of 100 μg/mL GST- IκBα and 5 μM [33P]ATP in 40 mM Tris HCl, pH 7.5, containing 4 mM MgCl2, 34 mM sodium phosphate, 3 mM NaCl, 0.6 mM potassium phosphate, 1 mM KCl, 1 mM dithiothreitol, 3% (w/v) glycerol, and 250 μg/mL bovine serum albumin. The specific activity of [33P]ATP used in the assay was 100 Ci/mmol. After 5 mins, the kinase reactions were stopped by the addition of 2× Laemmli sample buffer and heat-treated at 90℃ for 1 min. The samples were then loaded on to NuPAGE 10% BisTris gels. After completion of SDS-PAGE, gels were dried on a slab gel dryer. The bands were then detected using a 445Si PhosphorImager, and the radioactivity was quantified using ImageQuant software. Under these conditions, the degree of phosphorylation of GST-IκBα was linear with time and concentration of enzyme.

Cell lines

THP-1 monocytic cells

Preparation method

Soluble in DMSO. General tips for obtaining a higher concentration: Please warm the tube at 37℃ for 10 minutes and/or shake it in the ultrasonic bath for a while. Stock solution can be stored below -20℃ for several months.

Reaction Conditions

1 ~ 100 μM or 0.04 ~ 25 μM; 60 mins

Applications

BMS-345541 inhibited the TNFα-stimulated phosphorylation of Iκ-Bα in a dose-dependent manner (IC50 = 4 μM), and reduced the stimulated production of TNFα, IL-1β, IL-8 and IL-6 (IC50 = 1 ~ 5 μM).

Animal models

Female BALB/c mice

Dosage form

2 mg/kg (1 mL/kg), i.v.; 10 mg/kg (5 mL/kg), p.o.

Applications

Oral administration of BMS-345541 to mice resulted in prolonged serum drug levels, with concentrations sustained at or above 1 μM for many hrs. BMS-345541 exhibited 100% oral bioavailability. At the dose of 10 mg/kg, BMS-345541 inhibited the production of TNFα induced by LPS and exhibited 50% inhibition. At the dose of 100 mg/kg, BMS-345541 completely inhibited TNFα production.

Other notes

Please test the solubility of all compounds indoor, and the actual solubility may slightly differ with the theoretical value. This is caused by an experimental system error and it is normal.

References:

[1]. Burke JR, Pattoli MA, Gregor KR, et al. BMS-345541 is a highly selective inhibitor of I kappa B kinase that binds at an allosteric site of the enzyme and blocks NF-kappa B-dependent transcription in mice. J Biol Chem, 2003, 278(3): 1450-1456.