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    FR 180204
    FR 180204

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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 #: V0465
    CAS #: 865362-74-9Purity ≥98%

    Description: FR-180204 (FR180204) is a novel, potent, selective and ATP-competitive inhibitor of ERK (extracellular signal-regulated kinase) with potential anti-inflammatory activity and has the potential to be used as a new therapy for rheumatoid arthritis. It inhibits ERK1 And ERK2 with Kis of 0.31 μM and 0.14 μM, respectively, and displays 30-fold higher selectivity for ERK over p38α (IC50 = 10 μM); It exhibits no/little activity against human recombinant MEK1, MKK4, IKKα, PKCα, Src, Syc and PDGFα at concentrations of >30 μM.

    References: Biochem Biophys Res Commun. 2005 Oct 14;336(1):357-63; Cell Physiol Biochem. 2012;29(5-6):667-74.

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    Molecular Weight (MW)327.34
    CAS No.865362-74-9
    Storage-20℃ for 3 years in powder form
    -80℃ for 2 years in solvent
    Solubility (In vitro)DMSO: 65 mg/mL (198.6 mM)
    Water: <1 mg/mL
    Ethanol: 2 mg/mL warmed (6.1 mM)
    Other infoChemical Name: 5-(2-phenylpyrazolo[1,5-a]pyridin-3-yl)-1H-pyrazolo[3,4-c]pyridazin-3-amine
    InChi Code: InChI=1S/C18H13N7/c19-17-12-10-13(20-22-18(12)23-21-17)15-14-8-4-5-9-25(14)24-16(15)11-6-2-1-3-7-11/h1-10H,(H3,19,21,22,23)
    SMILES Code: NC1=NNC2=NN=C(C3=C4C=CC=CN4N=C3C5=CC=CC=C5)C=C21
    SynonymsFR-180204; FR 180204; FR180204.

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    In Vitro

    In vitro activity: In AP-1-transfected cells, FR180204 dose-dependently inhibits AP-1 transactivation with IC50 of 3.1 μM. FR 180204 inhibits spontaneous mesothelioma cell growth.

    Kinase Assay: Nunc-Immuno MaxiSorp plates are coated with 20 μg/ml MBP solution in phosphate-buffered saline (PBS). After washing with PBS containing 0.05% Tween 20 (T-PBS), blocking buffer (T-PBS containing 3% BSA) is added to each well and the plates are incubated for 10 min at room temperature. After washing with T-PBS, chemical compounds, ATP and recombinant ERK2 diluted in assay dilution buffer (20 mM Mops, pH 7.2, 25 mM β-glycerol phosphate, 5 mM EGTA, 1 mM sodium orthovanadate, 1 mM dithiothreitol, and 50 μg/ml BSA) and are added to each well. Vehicle groups (containing 0.1% DMSO) and kinase-withdrawal groups are used for the control and basal determinations. After incubation for 1 h at room temperature, plates are washed twice with T-PBS. Anti-phospho MBP antibody (0.2 μg/ml) is added to each well, and the plates are incubated for 1 h at room temperature. After washing, anti-mouse HRP-conjugated polyclonal antibodies are added and the plates were incubated for 30 min. SuperSignal chemiluminescent substrate is used for the measurement of HRP activity according to the manufacturer’s instructions. Prism 4.0 software is used for the Lineweaver–Burk plot analysis, IC50 and Ki determinations. 

    Cell Assay: Cell viability is assayed by the method using MTT. MTT-reactive cells are quantified at an absorbance of 570 nm using a micro-plate reader.

    In VivoIn collagen-induced arthritis mice, FR180204 (100 mg/kg, i.p., b.i.d.) significantly decreases the severity of symptoms and body weight loss. In a mouse model of dengue virus (DENV) infection, FR180204 limits hepatocyte apoptosis, reduces DENV-induced liver injury, and improves Clinical parameters.
    Animal modelCollagen-induced arthritis mouse model
    Formulation & DosageSuspended in 0.1% methylcellulose solution; 100 mg/kg; i.p. injection

    Naunyn Schmiedebergs Arch Pharmacol. 2007 Jan;374(4):311-6.

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


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