Inhibitors of cytochrome P-450-dependent arachidonic acid metabolism.

Capdevila J, Gil L, Orellana M, Marnett LJ, Mason JI, Yadagiri P, Falck JR
Arch Biochem Biophys. 1988 261 (2): 257-63

PMID: 3128168 · DOI:10.1016/0003-9861(88)90340-2

A new generation of heteroatom analogs of arachidonic acid are documented as powerful and selective inhibitors of the cytochrome P-450-dependent arachidonic acid oxygenase reaction (IC50, 5-10 microM) with little effect on either cyclooxygenase or soybean lipoxidase at 100 microM. The imidazole derivatives, ketoconazole and clotrimazole, are potent and selective inhibitors of the arachidonic acid epoxygenase and lipoxidase-like activities of phenobarbital-induced rat liver microsomal fractions (IC50, 2.0 and 0.3 microM, respectively). In contrast, the w/w-1 oxygenase activity of ciprofibrate-induced microsomal fractions was relatively resistant to inhibition by these compounds (IC50, 50 and 25 microM for ketoconazole and clotrimazole, respectively). Nordihydroguaiaretic acid (NDGA), eicosatetraynoic acid (ETYA), and indomethacin, extensively utilized inhibitors of the cyclooxygenase and lipoxygenase branches of the arachidonate cascade, also inhibit cytochrome P-450-dependent arachidonic acid metabolism. In decreasing order of potency, they were NDGA, ETYA, and indomethacin (IC50, 15, 40, and 70 microM, respectively).

MeSH Terms (19)

5,8,11,14-Eicosatetraynoic Acid Animals Arachidonate Lipoxygenases Arachidonic Acid Arachidonic Acids Aspirin Clotrimazole Cyclooxygenase Inhibitors Cytochrome P-450 Enzyme Inhibitors Cytochrome P-450 Enzyme System Indomethacin Ketoconazole Male Masoprocol Microsomes, Liver NADP Oxygenases Rats Rats, Inbred Strains

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