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    Losmapimod (GW0856553X; SB0856553)
    Losmapimod (GW0856553X; SB0856553)

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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 #: V0485
    CAS #: 585543-15-3Purity ≥98%

    Description: Losmapimod (formerly known as GSK-AHAB; GSK AHAB; GW856553, SB856553 or GW-856553X) is a novel, selective, potent, and orally bioavailable inhibitor of p38 MAPK (p38 mitogen-activated protein kinases) with potential antidepressant, anti-hypertensive and anti-inflammatory activity. It inhibits p38 MAPK with a pKi of 8.1 and 7.6 for p38α and p38β, respectively. Losmapimod has potential antidepressant activity and it has completed Phase II human clinical trials for the treatment of depression although its safety and efficacy have yet to be proven in further trials. Losmapimod is also being studied for cardiovascular disease. Two Phase II trials, one to study its effects in myocardial infarction (heart attack) and another for the treatment of COPD (chronic obstructive pulmonary disease), are underway. 

    References: J Pharmacol Exp Ther. 2009 Sep;330(3):964-70; Circulation. 2011 Feb 8;123(5):515-23.

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    Molecular Weight (MW)383.46
    FormulaC22H26FN3O2
    CAS No.585543-15-3
    Storage-20℃ for 3 years in powder form
    -80℃ for 2 years in solvent
    Solubility (In vitro)DMSO: 76 mg/mL (198.2 mM)
    Water: <1 mg/mL
    Ethanol: 41 mg/mL (106.9 mM)
    Solubility (In vivo)4% DMSO+30% PEG 300+5% Tween 80+ddH2O: 5 mg/mL
    SynonymsGW856553; Losmapimod; GSKAHAB; GW856553X; GW-856553; GW 856553, GSK-AHAB; GSK AHAB; GW-856553X; GW 856553X; SB856553; SB-856553; SB 856553 

    Chemical Name: 6-[5-(cyclopropylcarbamoyl)-3-fluoro-2-methylphenyl]-N-(2,2-dimethylpropyl)pyridine-3-carboxamide.

    SMILES Code: O=C(C1=CC=C(C2=CC(C(NC3CC3)=O)=CC(F)=C2C)N=C1)NCC(C)(C)C


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    In Vitro

    In vitro activity: Losmapimod (formerly known as GW856553 or GW856553X) is a novel, selective, potent, and orally bioavailable inhibitor of p38 MAPK (p38 mitogen-activated protein kinases) with pKi of 8.1 and 7.6 for p38α and p38β, respectively. Losmapimod has potential antidepressant activity and it has completed Phase II human clinical trials for the treatment of depression although its safety and efficacy have yet to be proven in further trials. Losmapimod is also being studied for cardiovascular disease. Two Phase II trials, one to study its effects in myocardial infarction (heart attack) and another for the treatment of COPD (chronic obstructive pulmonary disease), are underway. In spontaneously hypertensive stroke-prone rats (SHR-SP), Losmapimod significantly improves survival, endothelial-dependent and -independent vascular relaxation, and indices of renal function, and subsequently attenuates dyslipidemia, hypertension, cardiac remodeling, plasma renin activity (PRA), aldosterone, and interleukin-1beta (IL-1beta).


    Kinase Assay: Losmapimod (GW856553, GW856553X, GSK-AHAB) is a potent and selective inhibitor of p38 MAPK with pKi values of 8.1 and 7.6 for p38α and p38β, respectively.


    Cell Assay: In SHR-SPs receiving a salt-fat diet (SFD), chronic treatment with GSK-AHAB significantly and dose-dependently improved survival, endothelial-dependent and -independent vascular relaxation, and indices of renal function, and it attenuated dyslipidemia, hypertension, cardiac remodeling, plasma renin activity (PRA), aldosterone, and interleukin-1beta (IL-1beta).

    In VivoIn the spontaneously hypertensive stroke-prone rats (SHR-SPs) with a salt-fat diet, GSK-AHAB significantly improved survival and renal function in a dose-dependent way and induced vascular relaxation. Also, GSK-AHAB attenuated hypertension, cardiac remodeling, dyslipidemia, plasma renin activity (PRA), interleukin-1 (IL-1) and aldosterone. In patients with hypercholesterolemia, losmapimod improved acetylcholine, sodium nitroprusside and NG-monomethyl-L-arginine (L-NMMA) responses by 25%, 20% and 10%, respectively. Also, losmapimod reduced C-reactive protein (a systemic inflammatory marker) by 57%. These results suggested that losmapimod improved NO-mediated vasodilatation and inhibited inflammation. In patients with chronic obstructive pulmonary disease (COPD), losmapimod (7.5 mg twice daily) reduced plasma fibrinogen by 11% and was well tolerated.
    Animal model Hypertensive stroke-prone rats (SHR-SPs)
    Formulation & Dosage 7.5 mg
    ReferencesJ Pharmacol Exp Ther. 2009 Sep;330(3):964-70; Circulation. 2011 Feb 8;123(5):515-23.


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

    Losmapimod (GW856553X)

    Structure (A) and activity profile (B) of GSK-AHAB, an aryl heteroaryl bis-carboxyamide series p38 MAPK inhibitor.  2009 Sep;330(3):964-70.

    Losmapimod (GW856553X)

    A, plasma concentration of GSK-AHAB and rofecoxib after 4 weeks of dietary dosing. B, COX1 and COX2 activity was determined in rofecoxib samples obtained at 8:00 AM.  2009 Sep;330(3):964-70.

    Losmapimod (GW856553X)

    Effects of treatment on survival (A) and mean arterial blood pressure (B) in stroke-prone, SHR-SPs placed on a SFD.  2009 Sep;330(3):964-70.

    Losmapimod (GW856553X)

    Urinary albumin excretion and creatinine clearance was determined at baseline before introduction of the SFD and at 2, 4, and 6 weeks of the study in all groups.  2009 Sep;330(3):964-70.

    Losmapimod (GW856553X)

    Vascular relaxation studies were performed in isolated thoracic aorta ring segments obtained from stroke-prone hypertensive rats maintained on a SFD for 8 weeks.  2009 Sep;330(3):964-70.

    Losmapimod (GW856553X)

    Losmapimod (GW856553X)

    PRA and plasma concentrations of aldosterone and IL-1β were measured from blood samples obtained at 4 and 8 weeks of the study and in all groups.  2009 Sep;330(3):964-70.


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