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CYP3A4




Cytochrome P450, family 3, subfamily A, polypeptide 4
Structure of CYP3A4 (from PDB 1W0E).
Heme group visible at center.
Available structures: 1tqn, 1w0e, 1w0f, 1w0g, 2j0c, 2j0d
Identifiers
Symbol(s) CYP3A4; CYP3A; CP33; CP34; CYP3A3; HLP; MGC126680; NF-25; P450C3; P450PCN1
External IDs OMIM: 124010 Homologene: 88816
EC number 1.14.13.97
RNA expression pattern

More reference expression data

Orthologs
Human Mouse
Entrez 1576 na
Ensembl ENSG00000160868 na
Uniprot P05184 na
Refseq NM_017460 (mRNA)
NP_059488 (protein)
na (mRNA)
na (protein)
Location Chr 7: 99.08 - 99.22 Mb na
Pubmed search [1] na

Cytochrome P450 3A4 (abbreviated CYP3A4) (EC 1.14.13.97), a member of the cytochrome P450 mixed-function oxidase system, is one of the most important enzymes involved in the metabolism of xenobiotics in the body. CYP3A4 is involved in the oxidation of the largest range of substrates of all the CYPs. CYP3A4 is also, correspondingly, present in the largest quantity of all the CYPs in the liver.

Foetuses do not express CYP3A4 in their liver/tissues; but rather CYP3A7, which acts on a similar range of substrates. CYP3A7 is gradually replaced by CYP3A4 in the developing neonate.

Additional recommended knowledge

Contents

Distribution

Although CYP3A4 is predominantly found in the liver, it is also present in other organs and tissues of the body where it may play an important role in metabolism. CYP3A4 in the intestine plays an important role in the metabolism of certain drugs. Often this allows prodrugs to be activated and absorbed - as in the case of the histamine H1-receptor antagonist terfenadine.

Recently CYP3A4 has also been identified in the brain, however its role in the CNS is still unknown.[1]

Variability

Whilst over 28 single nucleotide polymorphisms (SNPs) have been identified in the CYP3A4 gene, it has been found that this does not translate into significant interindividual variability in vivo. It can be supposed that this may be due to the induction of CYP3A4 on exposure to substrates.

Variability in CYP3A4 function can be determined noninvasively by the erythromycin breath test (ERMBT). The ERMBT estimates in vivo CYP3A4 activity by measuring the radiolabelled carbon dioxide exhaled after an intravenous dose of (14C-N-methyl)-erythromycin.[2]

Induction

CYP3A4 is induced by a wide variety of ligands. These ligands bind to the Pregnane X Receptor (PXR). The activated PXR complex forms a heterodimer with the Retinoid X Receptor (RXR) which binds to the XREM region of the CYP3A4 gene. XREM is a regulatory region of the CYP3A4 gene, and binding causes a cooperative interaction with proximal promoter regions of the gene, resulting in increased transcription and expression of CYP3A4.

CYP3A4 ligands

Selected inducers, inhibitors and substrates of CYP3A4[3]
Substrates Inhibitors Inducers
Often mentioned: [4]

Other:

Strong: [5]

unspecified:

Often mentioned: [4]

Other:

References

  1. ^ Robertson G, Field J, Goodwin B, Bierach S, Tran M, Lehnert A, Liddle C (2003). "Transgenic mouse models of human CYP3A4 gene regulation". Mol Pharmacol 64 (1): 42-50. PMID 12815159.
  2. ^ Watkins P (1994). "Noninvasive tests of CYP3A enzymes". Pharmacogenetics 4 (4): 171-84. PMID 7987401.
  3. ^ Where classes of agents are listed, there may be exceptions within the class
  4. ^ a b Mentioned both in the reference named FASS and were previously mentioned in Wikipedia. Further contributions may follow other systems
  5. ^ [http://www.fass.se/LIF/produktfakta/fakta_lakare_artikel.jsp?articleID=18352 Swedish environmental classification of pharmaceuticals] Facts for prescribers (Fakta för förskrivare)
  6. ^ a b Non-nucleoside reverse transcriptase inhibitors have been shown to both induce and inhibit CYP3A4.
 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "CYP3A4". A list of authors is available in Wikipedia.
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