Myeloperoxidase Inhibitor-I

A benzoic acid hydrazide analog that acts as a potent, specific, and irreversible inhibitor of myeloperoxidase. ABAH is a mechanism-based inhibitor that is oxidized to radical intermediates that, in turn, promote the irreversible inactivation of myeloperoxidase. Reported to inhibit hypochlorous acid (HOCl) production by purified myeloperoxidase (IC₅₀ = 300 nM). Has also been shown to inhibit HOCl production up to 90% in zymosan and phorbol myristate acetate stimulated neutrophils (IC₅₀ = 16 µM and 2.2 µM, respectively). Does not affect superoxide radical production or degranulation of neutrophils and does not inhibit catalase or glutathione peroxidase. Shown to inhibit myeloperoxidase-mediated apoptosis in >90% of ras-expressing fibroblasts and glutathione-depleted, src-transformed cells. Also shown to inhibit apoptosis in H₂O₂-treated HL-60 promyelocytic leukemia cells.

Cell permeable: no

Primary Target
Myeloperoxidase

Product does not compete with ATP.

Reversible: no

Target IC₅₀: 300 nM against myeloperoxidase (MPO)

Packaged under inert gas

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

Engelmann, I., et al. 2000. Redox Report5, 207.
Wagner, B.A., et al. 2000. J. Biol. Chem.275, 22461.
Burner, U., et al. 1999. J. Biol. Chem.274, 9494.
Kettle, A.J., et al. 1997. Biochem. J.321, 503.
Kettle, A.J., et al. 1995. Biochem. J.308, 559.

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

Toxicity: Irritant (B)