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• W2015380892 abstract "The hepatic metabolism of steroid hormones and of xenobiotics frequently depends on the expression of the sex‐specific isoforms of cytochrome P ‐450 and on differences in sex hormones. Following biochemical, immunological and molecular biological investigations, it was shown that in adult rat liver there exist at least four male‐specific and one female‐specific isoforms of cytochrome P ‐450. The designation of these sex‐specific genes is IIC11, IIIA2, IIC13 and IIA2 in males, and IIC12 in females. The irreversible programming of the expression of these isoforms of cytochrome P ‐450 in adulthood occurs during the perinatal period of life, and is named enzyme imprinting. One of the main factors that regulates the expression of the sex‐specific isoforms of cytochrome P ‐450 is the level of androgens in the blood. Castration of adult rats decreased the level of the male isoforms of cytochrome P ‐450 and the activity of the monooxygenase enzyme system that remained higher than in intact females. The mechanism of enzyme imprinting can be explained as follows: neonatal androgens program the secretion of hypothalamic hormones, somatostatin and growth‐hormone‐releasing factor. These factors determine the type of growth hormone secretion in adult rats, and this controls the type of sex‐specific isoforms of cytochrome P ‐450 expressed in adulthood. Metabolic regulation similar to that outlined above was shown to occur for several metabolism‐dependent chemical carcinogens. Such a pathway may explain the different sensitivity displayed by male and female rats to treatment with these carcinogenic agents. One possible way of modulating the expression of some isoforms of cytochrome P ‐450 in adult rats is by treating neonates with specific xenobiotics that change the constitutive expression of neonatal androgens. It appears that this enzyme imprinting plays an important role in determining the individual sensitivity to the carcinogenic effects of chemicals." @default.
• W2015380892 created "2016-06-24" @default.
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• W2015380892 date "1991-02-01" @default.
• W2015380892 modified "2023-10-18" @default.
• W2015380892 title "Regulation of the expression of the sex‐specific isoforms of cytochrome <i>P</i>‐450 in rat liver" @default.
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• W2015380892 doi "https://doi.org/10.1111/j.1432-1033.1991.tb15741.x" @default.
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