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Pathway Description
Cyclophosphamide Metabolism Pathway
Homo sapiens
Drug Metabolism Pathway
Created: 2013-09-11
Last Updated: 2019-08-30
Cyclophosphamide is an alkylating agent used in the treatment of certain cancers. Following absorption, cyclophosphamide is converted into 4-hydroxyphosphamide by a variety of cytochrome P450 isozymes in the liver. 4-Hydroxyphosphamide is more soluble than cyclophosphamide and is the primary form of the drug that is transported in blood. 4-Hydroxyphosphamide crosses the plasma membrane of the cancer cell and spontaneuosly forms aldophosphamide. This is a reversible reaction. Aldophosphamide can decompose into acrolein and phosphoramide mustard. Phosphoramide mustard is the active alkylating agent and forms alkyl adducts with DNA through a phosphoramide aziridinium intermediate. Alkylation of DNA causes DNA damage and eventually cell death.
References
Cyclophosphamide Pathway References
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Pubmed: 9322882
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Pubmed: 2827463
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Pubmed: 3697070
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Pubmed: 14702039
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Pubmed: 11470993
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Pubmed: 15190123
Yamano S, Nhamburo PT, Aoyama T, Meyer UA, Inaba T, Kalow W, Gelboin HV, McBride OW, Gonzalez FJ: cDNA cloning and sequence and cDNA-directed expression of human P450 IIB1: identification of a normal and two variant cDNAs derived from the CYP2B locus on chromosome 19 and differential expression of the IIB mRNAs in human liver. Biochemistry. 1989 Sep 5;28(18):7340-8. doi: 10.1021/bi00444a029.
Pubmed: 2573390
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Pubmed: 11950794
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Pubmed: 9732415
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Pubmed: 10022751
Hsieh KP, Lin YY, Cheng CL, Lai ML, Lin MS, Siest JP, Huang JD: Novel mutations of CYP3A4 in Chinese. Drug Metab Dispos. 2001 Mar;29(3):268-73.
Pubmed: 11181494
Molowa DT, Schuetz EG, Wrighton SA, Watkins PB, Kremers P, Mendez-Picon G, Parker GA, Guzelian PS: Complete cDNA sequence of a cytochrome P-450 inducible by glucocorticoids in human liver. Proc Natl Acad Sci U S A. 1986 Jul;83(14):5311-5. doi: 10.1073/pnas.83.14.5311.
Pubmed: 3460094
Gonzalez FJ, Schmid BJ, Umeno M, Mcbride OW, Hardwick JP, Meyer UA, Gelboin HV, Idle JR: Human P450PCN1: sequence, chromosome localization, and direct evidence through cDNA expression that P450PCN1 is nifedipine oxidase. DNA. 1988 Mar;7(2):79-86. doi: 10.1089/dna.1988.7.79.
Pubmed: 3267210
Dai D, Zeldin DC, Blaisdell JA, Chanas B, Coulter SJ, Ghanayem BI, Goldstein JA: Polymorphisms in human CYP2C8 decrease metabolism of the anticancer drug paclitaxel and arachidonic acid. Pharmacogenetics. 2001 Oct;11(7):597-607.
Pubmed: 11668219
Okino ST, Quattrochi LC, Pendurthi UR, McBride OW, Tukey RH: Characterization of multiple human cytochrome P-450 1 cDNAs. The chromosomal localization of the gene and evidence for alternate RNA splicing. J Biol Chem. 1987 Nov 25;262(33):16072-9.
Pubmed: 3500169
Hadidi H, Zahlsen K, Idle JR, Cholerton S: A single amino acid substitution (Leu160His) in cytochrome P450 CYP2A6 causes switching from 7-hydroxylation to 3-hydroxylation of coumarin. Food Chem Toxicol. 1997 Sep;35(9):903-7.
Pubmed: 9409631
Miles JS, Bickmore W, Brook JD, McLaren AW, Meehan R, Wolf CR: Close linkage of the human cytochrome P450IIA and P450IIB gene subfamilies: implications for the assignment of substrate specificity. Nucleic Acids Res. 1989 Apr 25;17(8):2907-17. doi: 10.1093/nar/17.8.2907.
Pubmed: 2726448
Yamano S, Nagata K, Yamazoe Y, Kato R, Gelboin HV, Gonzalez FJ: cDNA and deduced amino acid sequences of human P450 IIA3 (CYP2A3). Nucleic Acids Res. 1989 Jun 26;17(12):4888. doi: 10.1093/nar/17.12.4888.
Pubmed: 2748347
Xiao T, Shoeb M, Siddiqui MS, Zhang M, Ramana KV, Srivastava SK, Vasiliou V, Ansari NH: Molecular cloning and oxidative modification of human lens ALDH1A1: implication in impaired detoxification of lipid aldehydes. J Toxicol Environ Health A. 2009;72(9):577-84. doi: 10.1080/15287390802706371.
Pubmed: 19296407
Morgan CA, Hurley TD: Development of a high-throughput in vitro assay to identify selective inhibitors for human ALDH1A1. Chem Biol Interact. 2015 Jun 5;234:29-37. doi: 10.1016/j.cbi.2014.10.028. Epub 2014 Nov 4.
Pubmed: 25450233
Hsu LC, Chang WC, Yoshida A: Genomic structure of the human cytosolic aldehyde dehydrogenase gene. Genomics. 1989 Nov;5(4):857-65.
Pubmed: 2591967
Hsu LC, Chang WC, Shibuya A, Yoshida A: Human stomach aldehyde dehydrogenase cDNA and genomic cloning, primary structure, and expression in Escherichia coli. J Biol Chem. 1992 Feb 15;267(5):3030-7.
Pubmed: 1737758
Hsu LC, Yoshida A: Human stomach aldehyde dehydrogenase, ALDH3. Adv Exp Med Biol. 1993;328:141-52. doi: 10.1007/978-1-4615-2904-0_16.
Pubmed: 8493892
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