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Olfactory rosettes from trout (Salmo gairdneri) were found to metabolise (14C-ethyl)-phenacetin to 14CO2 in vitro. Based on wet weight, the rate of metabolism was lower than that in liver and gills. Based on protein content, the rate of metabolism was about equal to that in liver and gills. Addition of the cytochrome P-450 inhibitors metyrapone, 9-hydroxyellipticine and piperonyl butoxide significantly decreased the formation of 14CO2 from (14C-ethyl)-phenacetin in olfactory rosettes. Microautoradiography of rosettes incubated with (14C-ethyl)-phenacetin showed the presence of non-extractable metabolites in the sensory and indifferent epithelium. Addition of metyrapone decreased the binding of radioactivity in the epithelia considerably. When olfactory rosettes were incubated with (14C-dimethylamine)-aminopyrine, no formation of 14CO2 was observed. The results are concluded to indicate that cytochrome P-450 dependent enzyme activity is present in the epithelia of the trout olfactory rosette.
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