A cell-permeable trisubstituted oxo-dihydropyrazolyl-benzoic acid that selectively inhibits the E3 ligase complex SCFβTrCP1-mediated ubiquitination of phosphorylated IκBα (IC50 = 5.2 µM), displaying little inhibitory potency against IKKβ-catalyzed IκBα phosphorylation, MDM2-mediated p53 ubiquitination, or the protease activities of cathepsin B, chymotrypsin, 20S & 26S proteasome (IC50 >100 µM). Cellular IκBα degradation blockage by GS143 treatment (complete inhibition against TNFα-induced degradation with 30 min 20 µM drug pretreatment in in HeLa S3 and HT29 cultures) effectively inhibits TNFα- and LPS-stimulated NF-κB transcription in HEK293, HT-29, and THP-1 cultures (IC50 from 2.1 to 10.5 µM). Intranasal administration (32 µg/20 µL/mouse) among OVA-sensitized mice 2 h prior to OVA challenge via inhalation greatly suppress OVA challenge-induced NF-κB activation in lung tissue (>90% inhibition of nuclear NF-κB p65 DNA-binding activity 2 h post challenge) and airway inflammation (>80% reduction in eosinophils & lymphocytes in BALF 48 h post challenge) in vivo. GS143 most likely prevents SCFβTrCP1 from interacting with phosphorylated IκBα without inhibiting SCFβTrCP1 E3 ligase activity directly, as no apparent accumulation of another known SCFβTrCP1 substrate β-catenin is seen in HeLa S3 cells upon GS143 treatment (up to 20 µM for 3 h).
Azioni biochim/fisiol
Cell permeable: yes
Primary Target phosphorylated IκBα
Confezionamento
Packaged under inert gas
Attenzione
Toxicity: Standard Handling (A)
Ricostituzione
Following reconstitution, aliquot and freeze (-20°C). Stock solutions are stable for up to 3 months at -20°C.
Use only fresh DMSO for reconstitution.
Altre note
Hirose, K., et al. 2008. Biochem. Biophys. Res. Commun.374, 507.
Nakajima, H., et al. 2008. Biochem. Biophys. Res. Commun.368, 1007.
Note legali
CALBIOCHEM is a registered trademark of Merck KGaA, Darmstadt, Germany
Codice della classe di stoccaggio
11 - Combustible Solids
Classe di pericolosità dell'acqua (WGK)
WGK 3
Punto d’infiammabilità (°F)
Not applicable
Punto d’infiammabilità (°C)
Not applicable
Certificati d'analisi (COA)
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