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Cytochromes P450 (P450) are a family of isozymes which play an important role in xenobiotic metabolism. The concentration of three P450 isozymes, namely P450-IIE1(A1c),-IIIA(NF) and -IIC8-10(MP) has been measured in human liver biopsies of patients with different alcohol and drug intake status. All these three P450s were expressed in all subjects. Ethanol intake increased P450-IIE1(A1c) content with no effect on the content of the two other P450s. Drug intake (barbiturates) increased both P450-IIIA(NF) and -IIC8-10(MP) content without any effect on P450-IIE1(A1c). This paper brought, at protein level, further evidence of the importance of environmental conditions on P450 isozyme pattern, and therefore, on drug metabolizing capacity of human liver.
Perrot et al. (Fri,) studied this question.