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Research Article

Human Cytochrome P450 Family 4 Enzymes: Function, Genetic Variation and Regulation

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Pages 515-538 | Published online: 09 Oct 2008
 

Abstract

The microsomal cytochrome P450 (CYP) family 4 monooxygenases are the major fatty acid ω-hydroxylases. These enzymes remove excess free fatty acids to prevent lipotoxicity, catabolize leukotrienes and prostanoids, and also produce bioactive metabolites from arachidonic acid ω-hydroxylation. In addition to endogenous substrates, recent evidence indicates that CYP4 monooxygenases can also metabolize xenobiotics, including therapeutic drugs. This review focuses on human CYP4 enzymes and updates current knowledge concerning catalytic activity profiles, genetic variation and regulation of expression. Comparative differences between the human and rodent CYP4 enzymes regarding catalytic function and conditional expression are also discussed.

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