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5.04908 Sigma-Aldrich

Myeloperoxidase Inhibitor-II - Calbiochem

Synonym: 4-(5-Fluoro-1H-indol-3-yl)butanamide, MPO Inhibitor II, Myeloperoxidase Inhibitor-II - Calbiochem

  • Empirical Formula (Hill Notation) C12H13FN2O

  • Molecular Weight 220.24

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Properties

Related Categories Antioxidant and Free Radical Scavengers, Cancer Research, Cell Biology, Chemopreventive Agents
Quality Level   100
assay   ≥95% (HPLC)
form   powder
mfr. no.   Calbiochem®
storage condition   OK to freeze
  protect from light
storage conditions   +2C to +8C
color   light beige
solubility   DMSO: 100 mg/mL

Description

General description

A 5-fluorotryptamine derivative that inhibitis the MPO-catalyzed Cl-/chloride-to-OCl-/hypochlorite oxidation in the presence of H2O2 (IC50 = 18 nM by taurine/2-aminoethan-sulfonic acid chlorination assay) as well as MPO-mediated LDL ApoB-100 (ApoB100; apolipoprotein B-100) oxidation (IC50 = 18 nM by ELISA) via direct affinity binding at the myeloperoxidase active site through ϖ-ϖ interaction between its indole and the the enzyme′s heme pyrrole ring D, while exhibiting much reduced affinity toward serotonin reuptake transporter/SERT (Ki = 631 nM). Kinetic studies reveal that the inhibitor acts as a good one-electron donor for the intermediate Compound I "Fe(IV)=O...Por•+", facilitating the formation (k3 = 1,6 x 107 M-1 s-1) of Compound II (Fe(IV)-OH...Por) and thereby preventing the reduction of Compound I directly to the resting state "Fe(IV)...Por" via the "halogenation cycle", while, on the other hand, behaves as a poor electron donor for Compound II, thereby preventing the completion of the "peroxidase cycle" by stalling the further reduction of Compound II to the resting state (k4 = 92 M-1 s-1). Toxicology study using Wistar Han male rats reports no signs of adverse effects post single 10 mg/kg i.p. dosage, while signs of adverse effects are observed within the 24 h, but not after, post a higher i.p. dosage at 100 mg/kg.

A 5-fluorotryptamine derivative that inhibits myeloperoxidase/MPO activity (IC50 = 18 nM) via direct affinity interaction with enzyme active site heme pyrrole ring D, while exhibiting much reduced affinity toward serotonin reuptake transporter/SERT (Ki = 631 nM). Kinetic studies reveal that the inhibitor acts as a good one-electron donor for the intermediate Compound I "Fe(IV)=O...Por•+", facilitating the formation of Compound II (Fe(IV)-OH...Por) and thereby preventing the reduction of Compound I directly to the resting state "Fe(IV)...Por" via the "halogenation cycle", while, on the other hand, behaves as a poor electron donor for Compound II, thereby preventing the completion of the "peroxidase cycle" by stalling the further reduction of Compound II to the resting state.

Please note that the molecular weight for this compound is batch-specific due to variable water content.

Biochem/physiol Actions

Cell permeable: yes

Primary Target
myeloperoxidase

Reversible: yes

Packaging

Packaged under inert gas

Warning

Toxicity: Standard Handling (A)

Reconstitution

Following reconstitution, aliquot and freeze (-20°C). Stock solutions are stable for up to 6 months at -20°C.

Use only fresh DMSO for reconstitution.

Other Notes

Soubhye, J., et al. 2013. J. Med. Chem.56, 3943.
Soubhye, J., et al. 2010. J. Med. Chem.53, 8747.

Legal Information

CALBIOCHEM is a registered trademark of Merck KGaA, Darmstadt, Germany

Safety & Documentation

Safety Information

Safety Information for this product is unavailable at this time.
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