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    SB203580 (RWJ-64809)
    SB203580 (RWJ-64809)

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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 #: V0476
    CAS #: 152121-47-6 Purity ≥98%

    Description: SB203580 (also known as RWJ 64809) is a novel and potent p38 mitogen-activated protein kinase inhibitor (p38MAPK inhibitor) with the potential to treat Systemic lupus erythematosus (SLE). It inhibits p38MAPK with IC50s of 0.3-0.5 μM in THP-1 cells, and is 10-fold less potent to SAPK3(106T) and SAPK4(106T) and blocks PKB phosphorylation with IC50 of 3-5 μM. SB203580 suppresses the development of endometriosis by down-regulating proinflammatory cytokines and proteolytic factors in a mouse model. SB203580 is a competitive ATPsite inhibitor of p38MAPK with a selectivity probably determined by nonconserved regions within or near the ATP binding pocket and a Ki of 21 nM.

    References: J Biol Chem. 2000 Mar 10;275(10):7395-402; Br J Pharmacol. 2000 Sep;131(1):99-107.

    Related CAS: 869185-85-3 (hydrochloride salt)

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    Molecular Weight (MW)377.43
    CAS No.152121-47-6
    Storage-20℃ for 3 years in powder form
    -80℃ for 2 years in solvent
    Solubility (In vitro)DMSO: 43 mg/mL (113.9 mM)
    Water: <1 mg/mL
    Ethanol:<1 mg/mL
    Solubility (In vivo)4% DMSO+30% PEG 300+5% Tween 80+ddH2O: 5 mg/mL

    RWJ 64809; PB 203580; SB203580; SB203580; SB 203580; RWJ-64809; PB-203580; RWJ64809; PB203580;

    Chemical Name: 4-(5-(4-fluorophenyl)-2-(4-(methylsulfonyl)phenyl)-1H-imidazol-4-yl)pyridine


    InChi Code: InChI=1S/C21H16FN3O2S/c1-28(26,27)18-8-4-16(5-9-18)21-24-19(14-2-6-17(22)7-3-14)20(25-21)15-10-12-23-13-11-15/h2-13H,1H3,(H,24,25)

    SMILES Code: O=S(C1=CC=C(C2=NC(C3=CC=NC=C3)=C(C4=CC=C(F)C=C4)N2)C=C1)(C)=O 

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    In Vitro

    In vitro activity: SB203580 inhibits the IL-2-induced proliferation of primary human T cells, murine CT6 T cells, or BAF F7 B cells with an IC50 of 3–5 μm. SB203580 also inhibits IL-2-induced p70S6 kinase activation, although the concentration required is slightly higher with an IC50 above 10 μm. SB203580 also inhibits the activity of PDK1 in a dose-dependent manner with an IC50 in the 3–10 μm range. SB203580 inhibits p38-MAPK stimulation of MAPKAPK2 with an IC50 of approximately 0.07 μM, whereas inhibits total SAPK/JNK activity with an IC50 of 3–10 μM. SB203580 at higher concentrations activates the ERK pathway, which subsequently enhances NF-κB transcriptional activity. SB203580 induces autophagy in human hepatocellular carcinoma (HCC) cells.

    Kinase Assay: 4 μg of sheep anti-PKBα is immobilized on 25 μL of protein G-Sepharose overnight (or 1.5 hours) and washed in Buffer A (50 mm Tris, pH 7.5, 1 mm EDTA, 1 mm EGTA, 0.5 mm Na3VO4, 0.1% β-mercaptoethanol, 1% Triton X-100, 50 mm sodium fluoride, 5 mm sodium pyrophosphate, 0.1 mm phenylmethylsulfonyl fluoride, 1 μg/mL aprotinin, pepstatin, leupeptin, and 1 μm microcystin). The immobilized anti-PKB is then incubated with 0.5 ml of lysate (from 5 × 106 cells) for 1.5 hours and washed three times in 0.5 mL of Buffer A supplemented with 0.5 m NaCl, two times in 0.5 mL of Buffer B (50 mm Tris-HCl, pH 7.5, 0.03% (w/v) Brij-35, 0.1 mm EGTA, and 0.1% β-mercaptoethanol), and twice with 100 μl of assay dilution buffer; 5× assay dilution buffer is 100 mm MOPS, pH 7.2, 125 mm β-glycerophosphate, 25 mm EGTA, 5 mm sodium orthovanadate, 5 mm DTT. To the PKB enzyme immune complex is added 10 μL of assay dilution buffer, 40 μm protein kinase A inhibitor peptide, 100 μm PKB-specific substrate peptide, and 10 μCi of [γ-32P]ATP, all made up in assay dilution buffer. The reaction is incubated for 20 minutes at room temperature with shaking, then samples are pulse spun, and 40 μL of reaction volume are removed into another tube to which is added 20 μL of 40% trichloroacetic acid to stop the reaction. This is mixed and incubated for 5 minutes at room temperature, and 40 μL is transferred onto P81 phosphocellulose paper and allowed to bind for 30 seconds. The P81 piece is washed three times in 0.75% phosphoric acid then in acetone at room temperature. γ-32P incorporation is then measured by scintillation counting.

    Cell Assay: CT6 cell and BA/F3 F7 cell are rested by washing three times in RPMI and culturing overnight in RPMI, 5% fetal calf serum in the absence of growth factor, antibiotics, or β-mercaptoethanol supplements. 2–5 × 106 rested CT6 cells are resuspended in 2 mL of RPMI, 5% fetal calf serum and preincubated with SB203580 or vehicle control as indicated in figure legends. Cells are then stimulated with 20 ng/ml recombinant human IL-2 for 5 minutes at 37  °C and pelleted in a minifuge for 30 seconds, medium is aspirated, and the pellet is lysed in the appropriate buffer. BA/F3 cells stably expressing deletion mutants of IL-2 receptor β chain are maintained in glutamine containing RPMI further supplemented with 5% fetal calf serum and 0.2 μg/mL G418. The cells are then washed extensively, rested overnight, and washed again before activating with IL-2; such cell preparations are >90% T cells. Cellular proliferation assays are performed by measurement of [3H]thymidine incorporation.

    In VivoSB203580 protects pig myocardium against ischemic injury in an in vivo model. SB203580 is effective to prevent and treat the disease in MRL/lpr mice model of Systemic lupus erythematosus (SLE).
    Animal modelfemale MRL/lpr mice and female C57BL/6 mice with systemic SLE established
    Formulation & DosageDissolved in water; 0.1 M/day;  Oral gavage

    J Cardiovasc Pharmacol. 2000 Mar;35(3):474-83; Int Immunopharmacol. 2011 Sep;11(9):1319-26.

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




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