Cytochrome P450 3A expression in the human fetal liver: evidence that CYP3A5 is expressed in only a limited number of fetal livers
Abstract
CYP3A is the major cytochrome P450 subfamily constitutively expressed in the human liver. CYP3A4 is the predominant hepatic P450 form in adults and it is expressed at high but very variable levels among individuals. The fetal liver contains mainly CYP3A7, while the presence of the other CYP3A enzymes in fetal liver has remained controversial. In this study, the relative levels of CYP3A4, CYP3A5 and CYP3A7 expression were determined in a panel of 9-11 fetal livers with a similar gestation age (9-12 weeks) and compared to adult livers. CYP3A7 was found to be the major CYP3A form in all the fetal liver samples. The abundance of CYP3A7 varied more at the mRNA (77-fold variation) than at the protein level (4.8-fold variation). CYP3A5 mRNA was also detected in all of the fetal liver samples, but the average level was 700-fold lower than that of CYP3A7. CYP3A5 protein was detected by immunoblot analysis in only 1 fetal liver out of the 9 investigated, the level of expression being moderately high in this sample. CYP3A4 mRNA was detected in only a subset of the fetal liver samples and its level was the lowest of the CYP3A forms. This is the first study to demonstrate the polymorphic expression of CYP3A5 and the variability of CYP3A7 expression in fetal liver and suggests that significant interindividual differences in the metabolism of xenobiotics may already exist at the prenatal stage. These differences may contribute to individual pharmacological and/or toxicological responses in the fetus.
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CYP3A5's role in drug and steroid metabolism is limited due to its generally low activity and expression in a relatively small percentage of individuals.
“but its role in drug and steroid metabolism is limited due to its generally low activity and expression in a relatively small percentage of individuals [[123], [124], [125]].”
From Human steroid biosynthesis, metabolism and excretion are differentially reflected by serum and urine steroid metabolomes: a comprehensive review (2019) · cites this paper as [125]
CYP3A5 catalyzes a comparable range of reactions as CYP3A4.
“CYP3A5 catalyzes a comparable range of reactions as CYP3A4”
From Human steroid biosynthesis, metabolism and excretion are differentially reflected by serum and urine steroid metabolomes: a comprehensive review (2019) · cites this paper as [125]
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- Authors
- Hakkola, J., Raunio, H., Purkunen, R., Saarikoski, S., Vähäkangas, K., Pelkonen, O., Edwards, R. J., Boobis, A. R., & Pasanen, M.
- Affiliations
- University of Oulu (FI)
- Hammersmith Hospital (GB)
- Finnish Medicines Agency Fimea (FI)
- Venue
- Neonatology
- Publisher
- S. Karger AG
- Published
- 2001
- Volume
- 80
- Issue
- 3
- Pages
- 193-201
- ISSN
- 1661-7800 (ISSN-L)
- 1661-7819
- OpenAlex
- W2094145283
- Cited by
- 82
- References
- 38
- Citations by year
- 2025: 1 · 2024: 1 · 2023: 3 · 2022: 5 · 2021: 1 · 2020: 1 · 2019: 3 · 2018: 5 · 2017: 2 · 2016: 5 · 2015: 3 · 2014: 3 · 2013: 4 · 2012: 3
- FWCI
- 3.79
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Neonatology (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Pharmacology › Pharmacogenetics and Drug Metabolism
- Health Sciences › Medicine › Oncology › Drug Transport and Resistance Mechanisms
- Life Sciences › Pharmacology, Toxicology and Pharmaceutics › Pharmacology › Drug-Induced Hepatotoxicity and Protection
- Keywords
- CYP3A4, CYP3A5, CYP3A7, CYP3A, fetal liver, gene expression, interindividual variability, xenobiotic metabolism, fetal toxicity
- MeSH terms
- Aryl Hydrocarbon Hydroxylases, Cloning, Molecular, Cytochrome P-450 Enzyme System, Gestational Age, Humans, Mixed Function Oxygenases, Isoenzymes, Liver, Oxidoreductases, N-Demethylating, RNA, Messenger, Immunoblotting, Gene Expression, Polymerase Chain Reaction, Reverse Transcriptase Polymerase Chain Reaction, Cytochrome P-450 CYP3A
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