Inhibitors of cytochrome P-450-dependent arachidonic acid metabolism

Arch Biochem Biophys. 1988 Mar;261(2):257-63. doi: 10.1016/0003-9861(88)90340-2.

Abstract

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).

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, P.H.S.

MeSH terms

  • 5,8,11,14-Eicosatetraynoic Acid / pharmacology
  • Animals
  • Arachidonate Lipoxygenases / antagonists & inhibitors
  • Arachidonic Acid
  • Arachidonic Acids / metabolism*
  • Aspirin / pharmacology
  • Clotrimazole / pharmacology
  • Cyclooxygenase Inhibitors
  • Cytochrome P-450 Enzyme Inhibitors*
  • Cytochrome P-450 Enzyme System
  • Indomethacin / pharmacology
  • Ketoconazole / pharmacology
  • Male
  • Masoprocol / pharmacology
  • Microsomes, Liver / enzymology
  • Microsomes, Liver / metabolism
  • NADP / metabolism
  • Oxygenases / antagonists & inhibitors
  • Rats
  • Rats, Inbred Strains

Substances

  • Arachidonic Acids
  • Cyclooxygenase Inhibitors
  • Cytochrome P-450 Enzyme Inhibitors
  • 5,8,11,14-Eicosatetraynoic Acid
  • Arachidonic Acid
  • NADP
  • Masoprocol
  • Cytochrome P-450 Enzyme System
  • Oxygenases
  • Arachidonate Lipoxygenases
  • arachidonate epoxygenase
  • Clotrimazole
  • Aspirin
  • Ketoconazole
  • Indomethacin