Regulation of Synthesis and Activity of Cytochrome P-450 Enzymes in Physiological Pathways

  • Michael R. Waterman
  • Maliyakal E. John
  • Evan R. Simpson


Regulation of the levels and activities of various forms of cytochrome P450 has important implications in human biology. For example, it is well known that different individuals have different capacities to metabolize various drugs.1 Such variation may result, in part, from an allelic distribution of P-450 isozymes;2 or it may also result from individual variations in the level of a specific isozyme.3,4 Also, deficiencies of different steroid hydroxylases lead to various disease states. For example, adrenal hyperplasia occurs in approximately one in 5000 births, making it one of the more common inborn errors of metabolism.5 In at least 95% of these cases, the deficiency is detected as a decrease in steroid 21-hydroxylation in the adrenal cortex,6 a reaction catalyzed by a specific form of P-450 (P-450C21), leading to deficient cortisol biosynthesis. These are but a few examples which illustrate the reasons why investigation of the regulation of P-450 activities has become such an active area of research. In each example, understanding of the molecular basis of variations in P-450 gene expression will be necessary for the complete elucidation of the different phenotypes.


Adrenal Cortex Aromatase Activity Physiological Pathway Microsomal Cytochrome ACTH Treatment 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer Science+Business Media New York 1986

Authors and Affiliations

  • Michael R. Waterman
    • 1
  • Maliyakal E. John
    • 1
  • Evan R. Simpson
    • 2
  1. 1.Departments of Biochemistry and Obstetrics and GynecologyUniversity of Texas Health Science CenterDallasUSA
  2. 2.Departments of Biochemistry and Obstetrics and Gynecology, and Cecil H. and Ida Green Center for Reproductive Biology SciencesUniversity of Texas Health Science CenterDallasUSA

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