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• W2086137318 abstract "A major cause for unpredictable drug response is the enormous variability of drug-metabolizing cytochrome P450s (CYPs) in human liver in which genetic polymorphisms, regulation of gene expression, and physiological factors, including sex, may play a role. To dissect these different factors, we established a large human liver bank with extensive clinical documentation. Recent work concentrated on CYPs 2D6, 2B6, and the 3A family. CYP2D6 expression is highly polymorphic with over 70 alleles. Using liver samples and DNA from phenotyped patients, we further elucidated the genetic basis of phenotypic differences and demonstrated a novel role of alternative splicing, leading to decreased enzyme activity. These studies further emphasize the intricacy of genetic regulation at the CYP2D6 locus. In contrast, CYP2B6, the human orthologue of the rodent phenobarbital-inducible P450 2B, is known to be inducible by a range of substances, but our recent studies also show a high degree of genetic polymorphism. However, the role of polymorphism in determining CYP2B6 expression and function is less decisive as compared with CYP2D6. Thus, with respect to the balance between genetic and nongenetic factors controlling expression, CYP2B6 appears to take an intermediate position. CYP3A4 is the major P450 of human liver and contributes critically to the metabolism of at least half of all drugs. CYP3A4 expression variability is not influenced much by genetic polymorphism. Studies in our liver bank confirm that both induction and down-regulation occur as a consequence of drug treatment. As a further major determinant of hepatic CYP3A4 expression, we found sexual dimorphism, with women expressing at least twice the amount of CYP3A4 protein than men. This surprising result explains the many pharmacokinetic findings of faster metabolism of CYP3A4 drug substrates in women. In conclusion, these data illustrate how various factors contribute to the individual CYP profile in human liver." @default.
• W2086137318 created "2016-06-24" @default.
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• W2086137318 date "2005-01-01" @default.
• W2086137318 modified "2023-09-23" @default.
• W2086137318 title "Impact of Genetic Polymorphism in Relation to Other Factors on Expression and Function of Human Drug-Metabolizing P450s" @default.
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• W2086137318 doi "https://doi.org/10.1080/15376520590918847" @default.
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