CYP2B6
From Wikipedia, the free encyclopedia
Cytochrome P450 2B6 is an enzyme that in humans is encoded by the CYP2B6 gene.[1] CYP2B6 is a member of the Cytochrome P450 group of enzymes. Along with CYP2A6, it is involved with metabolizing nicotine, along with many other substances.[1]
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[edit] Function
This gene, CYP2B6, encodes a member of the cytochrome P450 superfamily of enzymes. The cytochrome P450 proteins are monooxygenases which catalyze many reactions involved in drug metabolism and synthesis of cholesterol, steroids and other lipids. This protein localizes to the endoplasmic reticulum and its expression is induced by phenobarbital. The enzyme is known to metabolize some xenobiotics, such as the anti-cancer drugs cyclophosphamide and ifosphamide.[1]
[edit] Gene
Transcript variants for this gene have been described; however, it has not been resolved whether these transcripts are in fact produced by this gene or by a closely related pseudogene, CYP2B7. Both the gene and the pseudogene are located in the middle of a CYP2A pseudogene found in a large cluster of cytochrome P450 genes from the CYP2A, CYP2B and CYP2F subfamilies on chromosome 19q.[1]
[edit] CYP2B6 Ligands
Following is a table of selected substrates, inducers and inhibitors of CYP2B6.
Inhibitors of CYP2B6 can be classified by their potency, such as:
- Strong inhibitor being one that causes at least a 5-fold increase in the plasma AUC values, or more than 80% decrease in clearance.[2]
- Moderate inhibitor being one that causes at least a 2-fold increase in the plasma AUC values, or 50-80% decrease in clearance.[2]
- Weak inhibitor being one that causes at least a 1.25-fold but less than 2-fold increase in the plasma AUC values, or 20-50% decrease in clearance.[2]
| Substrates | Inhibitors | Inducers |
|---|---|---|
|
Strong: Orphenadrine[3] (analgesic) Unspecified potency
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[edit] References
- ^ a b c d "Entrez Gene: cytochrome P450". http://www.ncbi.nlm.nih.gov/sites/entrez?Db=gene&Cmd=ShowDetailView&TermToSearch=1555.
- ^ a b c d e f g h i j k l m n Flockhart DA (2007). "Drug Interactions: Cytochrome P450 Drug Interaction Table". Indiana University School of Medicine. http://medicine.iupui.edu/flockhart/table.htm. Retrieved on December 25, 2008.
- ^ a b c d e f g h i j k l Swedish environmental classification of pharmaceuticals - FASS (drug catalog) - Facts for prescribers (Fakta för förskrivare). Retrieved July 2011
- ^ Volak LP, Ghirmai S, Cashman JR, Court MH (August 2008). "Curcuminoids inhibit multiple human cytochromes P450, UDP-glucuronosyltransferase, and sulfotransferase enzymes, whereas piperine is a relatively selective CYP3A4 inhibitor". Drug Metab. Dispos. 36 (8): 1594–605. doi:10.1124/dmd.108.020552. PMC 2574793. PMID 18480186. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=2574793.
[edit] Further reading
- Gounden V, van Niekerk C, Snyman T, George JA (2010). "Presence of the CYP2B6 516G> T polymorphism, increased plasma Efavirenz concentrations and early neuropsychiatric side effects in South African HIV-infected patients.". AIDS Res Ther 7: 32. doi:10.1186/1742-6405-7-32. PMC 2933581. PMID 20723261. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=2933581.
- Yang K, Koh KH, Jeong H (2010). "Induction of CYP2B6 and CYP3A4 expression by 1-aminobenzotriazole (ABT) in human hepatocytes". Drug Metab Lett 4 (3): 129–33. PMID 20642445.
- Ngaimisi E, Mugusi S, Minzi OM, et al. (2010). "Long-term efavirenz autoinduction and its effect on plasma exposure in HIV patients". Clin. Pharmacol. Ther. 88 (5): 676–84. doi:10.1038/clpt.2010.172. PMID 20881953.
- Smith G, Stubbins MJ, Harries LW, Wolf CR (1998). "Molecular genetics of the human cytochrome P450 monooxygenase superfamily". Xenobiotica 28 (12): 1129–65. doi:10.1080/004982598238868. PMID 9890157.
- Svärd J, Spiers JP, Mulcahy F, Hennessy M (2010). "Nuclear Receptor-Mediated Induction of CYP450 by Antiretrovirals: Functional Consequences of NR1I2 (PXR) Polymorphisms and Differential Prevalence in Whites and Sub-Saharan Africans". J. Acquir. Immune Defic. Syndr. 55 (5): HASH(0x271b490). doi:10.1097/QAI.0b013e3181f52f0c. PMID 20861742.
- Melanson SE, Stevenson K, Kim H, et al. (2010). "Allelic variations in CYP2B6 and CYP2C19 and survival of patients receiving cyclophosphamide prior to myeloablative hematopoietic stem cell transplantation". Am. J. Hematol. 85 (12): 967–71. doi:10.1002/ajh.21889. PMID 21108329.
- Yuan ZH, Liu Q, Zhang Y, et al. (2010). "CYP2B6 gene single nucleotide polymorphisms and leukemia susceptibility". Ann. Hematol. 90 (3): HASH(0x2bd3fb0). doi:10.1007/s00277-010-1085-z. PMID 20878158.
- Nelson DR, Zeldin DC, Hoffman SM, et al. (2004). "Comparison of cytochrome P450 (CYP) genes from the mouse and human genomes, including nomenclature recommendations for genes, pseudogenes and alternative-splice variants". Pharmacogenetics 14 (1): 1–18. doi:10.1097/00008571-200401000-00001. PMID 15128046.
- Mo SL, Liu YH, Duan W, et al. (2009). "Substrate specificity, regulation, and polymorphism of human cytochrome P450 2B6". Curr. Drug Metab. 10 (7): 730–53. PMID 19702527.
- Figueroa SC, de Gatta MF, GarcÃa LH, et al. (2010). "The convergence of therapeutic drug monitoring and pharmacogenetic testing to optimize efavirenz therapy". Ther Drug Monit 32 (5): 579–85. doi:10.1097/FTD.0b013e3181f0634c. PMID 20720517.
- Ribaudo HJ, Liu H, Schwab M, et al. (2010). "Effect of CYP2B6, ABCB1, and CYP3A5 polymorphisms on efavirenz pharmacokinetics and treatment response: an AIDS Clinical Trials Group study". J. Infect. Dis. 202 (5): 717–22. doi:10.1086/655470. PMC 2919241. PMID 20662624. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=2919241.
- Shimada M, Miyagawa T, Kawashima M, et al. (2010). "An approach based on a genome-wide association study reveals candidate loci for narcolepsy". Hum. Genet. 128 (4): 433–41. doi:10.1007/s00439-010-0862-z. PMID 20677014.
- Jamshidi Y, Moreton M, McKeown DA, et al. (2010). "Tribal ethnicity and CYP2B6 genetics in Ugandan and Zimbabwean populations in the UK: implications for efavirenz dosing in HIV infection". J. Antimicrob. Chemother. 65 (12): 2614–9. doi:10.1093/jac/dkq369. PMID 20952418.
- Lindfelt T, O'Brien J, Song JC, et al. (2010). "Efavirenz plasma concentrations and cytochrome 2B6 polymorphisms". Ann Pharmacother 44 (10): 1572–8. doi:10.1345/aph.1P141. PMID 20841522.
- Chung JY, Cho JY, Lim HS, et al. (2011). "Effects of pregnane X receptor (NR1I2) and CYP2B6 genetic polymorphisms on the induction of bupropion hydroxylation by rifampin". Drug Metab. Dispos. 39 (1): 92–7. doi:10.1124/dmd.110.035246. PMID 20876786.
- He C, Kraft P, Chasman DI, et al. (2010). "A large-scale candidate gene association study of age at menarche and age at natural menopause". Hum. Genet. 128 (5): 515–27. doi:10.1007/s00439-010-0878-4. PMC 2967297. PMID 20734064. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=2967297.
- Lampreabe I, Gainza de los Rios FJ, Arrieta Gutiérrez A, et al. (2010). "Toward personalized medicine in renal transplantation". Transplant. Proc. 42 (8): 2864–7. doi:10.1016/j.transproceed.2010.08.009. PMID 20970553.
- Elens L, Vandercam B, Yombi JC, et al. (2010). "Influence of host genetic factors on efavirenz plasma and intracellular pharmacokinetics in HIV-1-infected patients". Pharmacogenomics 11 (9): 1223–34. doi:10.2217/pgs.10.94. PMID 20860463.
- Chou M, Bertrand J, Segeral O, et al. (2010). "Population pharmacokinetic-pharmacogenetic study of nevirapine in HIV-infected Cambodian patients". Antimicrob. Agents Chemother. 54 (10): 4432–9. doi:10.1128/AAC.00512-10. PMC 2944557. PMID 20696882. http://www.pubmedcentral.nih.gov/articlerender.fcgi?tool=pmcentrez&artid=2944557.
- Bunten H, Liang WJ, Pounder DJ, et al. (2010). "OPRM1 and CYP2B6 gene variants as risk factors in methadone-related deaths". Clin. Pharmacol. Ther. 88 (3): 383–9. doi:10.1038/clpt.2010.127. PMID 20668445.
[edit] External links
This article incorporates text from the United States National Library of Medicine, which is in the public domain.
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