title: Molecular pharmacological profile of the nonredox-type 5-lipoxygenase inhibitor CJ-13,610.
abstract: 5-Lipoxygenase (5-LO) is a crucial enzyme in the synthesis of the bioactive leukotrienes (LTs) from arachidonic acid (AA), and inhibitors of 5-LO are thought to prevent the untowarded pathophysiological effects of LTs. In this study, we present the molecular pharmacological profile of the novel nonredox-type 5-LO inhibitor CJ-13,610 that was evaluated in various in vitro assays. In intact human polymorphonuclear leukocytes (PMNL), challenged with the Ca(2+)-ionophore A23187, CJ-13,610 potently suppressed 5-LO product formation with an IC(50)=0.07 microm. Supplementation of exogenous AA impaired the efficacy of CJ-13,610, implying a competitive mode of action. In analogy to ZM230487 and L-739.010, two closely related nonredox-type 5-LO inhibitors, CJ-13,610 up to 30 microm failed to inhibit 5-LO in cell-free assay systems under nonreducing conditions, but inclusion of peroxidase activity restored the efficacy of CJ-13,610 (IC(50)=0.3 microm). In contrast to ZM230487 and L-739.010, the potency of CJ-13,610 does not depend on the cell stimulus or the activation pathway of 5-LO. Thus, 5-LO product formation in PMNL induced by phosphorylation events was equally suppressed by CJ-13,610 as compared to Ca(2+)-mediated 5-LO activation. In transfected HeLa cells, CJ-13,610 only slightly discriminated between phosphorylatable wild-type 5-LO and a 5-LO mutant that lacks phosphorylation sites. In summary, CJ-13,610 may possess considerable potential as a potent orally active nonredox-type 5-LO inhibitor that lacks certain disadvantages of former representatives of this class of 5-LO inhibitors.
authors.affiliation: Institute of Pharmaceutical Chemistry, University of Frankfurt, Marie-Curie-Str. 9, Frankfurt D-60439, Germany.
authors.forename: Lutz
authors.initials: L
authors.lastname: Fischer
authors.forename: Dieter
authors.initials: D
authors.lastname: Steinhilber
authors.forename: Oliver
authors.initials: O
authors.lastname: Werz
mesh_terms: D001094:Arachidonate 5-Lipoxygenase / Q000378:metabolism*; D002467:Cell Nucleus / Q000187:drug effects / Q000378:metabolism; D002474:Cell-Free System; D002478:Cells, Cultured; D004926:Escherichia coli / Q000187:drug effects / Q000201:enzymology; D005979:Glutathione Peroxidase / Q000378:metabolism; D006367:HeLa Cells; D006801:Humans; D007093:Imidazoles / Q000494:pharmacology*; D008054:Lipid Peroxides / Q000378:metabolism; D016859:Lipoxygenase Inhibitors / Q000494:pharmacology*; D009504:Neutrophils / Q000187:drug effects / Q000201:enzymology; D010084:Oxidation-Reduction; D010957:Plasmids / Q000235:genetics; D013347:Subcellular Fractions / Q000187:drug effects / Q000201:enzymology; D013440:Sulfides / Q000494:pharmacology*; D014162:Transfection
chemical_list: C496810:CJ 13610; D007093:Imidazoles; D008054:Lipid Peroxides; D016859:Lipoxygenase Inhibitors; D013440:Sulfides; D005979:Glutathione Peroxidase; D001094:Arachidonate 5-Lipoxygenase