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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

12(R)-hydroxyeicosatetraenoic acid synthesis by 3-methylcholanthrene- and clofibrate-inducible cytochrome P450 in porcine ciliary epithelium.

Porcine ciliary epithelial microsomes synthesized 12[S]-hydroxy-5, 8, 10, 14-eicosatetraenoic acid (12[S]-HETE) from arachidonic acid by a membrane-bound lipoxygenase and 12[R]-isomer by the cytochrome P450-dependent monooxygenase system. The activity to form 12(R)-isomer was markedly enhanced by 3-methylcholanthrene and clofibrate. Both basal and induced levels of 12(R)-HETE synthesizing activity were considerably higher in nonpigmented epithelial cells than in pigmented cells of the ciliary processes. The induced activity was suppressed by polyclonal antibodies raised against purified cytochrome P450 IA1 and NADPH-P450 reductase but not by substrates for clofibrate-inducible omega/omega-1 hydroxylases (P450 IVA-mediated). These results suggest that 12(R)-HETE synthesis by porcine ciliary microsomes may be mediated by a cytochrome P450 of the IA family.[1]


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