AZD5904 (TX4) is an orally active 2-thioxanthine class suicide substrate that targets myeloperoxidase (MPO) for mechanism-based inactivation, covalently modifying MPO heme group without converting the enzyme to compound II. AZD5904 effectively inhibits peroxide-induced human MPO chlorination activity (IC50 = 0.2 μM) and extracellular MPO activity in PMA-stimulated human neutrophil cultures (by 68% at 1 μM). Oral administration (20-180 μmol/kg) of the racemate (TX3) is efficacious in reducing inflammation site MPO activity in mice in vivo with 10- to 19-fold selectivity over lactoperoxidase (LPO), thyroid peroxidase (TPO), and >70-fold selectivity over a panel of other enzymes, ion channels, and receptors.
Highly selective and orally available mechanism-based myeloperoxidase (MPO) inactivatior with in vitro and in vivo efficacy.
American journal of physiology. Endocrinology and metabolism, 317(6), E1063-E1069 (2019-10-09)
A high-fat diet (HFD) can rapidly recruit neutrophils to insulin target tissues and within days induce microvascular insulin resistance (IR). Myeloperoxidase (MPO) is highly enriched in neutrophils, can inhibit nitric oxide-mediated vasorelaxation in vitro and is associated with increased cardiovascular
Rapid communications in mass spectrometry : RCM, 26(12), 1399-1406 (2012-05-18)
The investigations in this article were triggered by two observations in the laboratory; for some liquid chromatography/tandem mass spectrometry (LC/MS/MS) systems it was possible to obtain linear calibration curves for extreme concentration ranges and for some systems seemingly linear calibration
Anti-neutrophil cytoplasmic antibody (ANCA) vasculitis is characterized by the presence of autoantibodies to myeloperoxidase and proteinase-3, which bind monocytes in addition to neutrophils. While a pathological effect on neutrophils is acknowledged, the impact of ANCA on monocyte function is less
Hypertrophic cardiomyopathy (HCM) is characterized by cardiomyocyte hypertrophy and disarray, and myocardial stiffness due to interstitial fibrosis, which result in impaired left ventricular filling and diastolic dysfunction. The latter manifests as exercise intolerance, angina, and dyspnoea. There is currently no
The leukocyte-derived heme enzyme myeloperoxidase (MPO) is released extracellularly during inflammation and impairs nitric oxide (NO) bioavailability by directly oxidizing NO or producing NO-consuming substrate radicals. Here, structurally diverse pharmacological agents with activities as MPO substrates/inhibitors or antioxidants were screened
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