Abstract
The cytochromes P-450, a family of heme proteins, play an important role in the oxidation of drugs and carcinogens, as well as endogenous substrates. We report the presence of cytochrome P-450 and associated mono-oxygenase activity in human brain regions and their selective enrichment in the brainstem. Immunocytochemical studies on human medulla with antibodies raised to phenobarbital-inducible rat liver cytochrome P-450 indicate that the enzyme is primarily localized in the neuronal cell bodies and to a lesser extent in the axons. These observations indicate that the human brain could be involved in metabolism of xenobiotics and endogenous compounds, mediated through cytochrome P-450.
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