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Pathway Description
Lamivudine Metabolism Pathway
Homo sapiens
Drug Metabolism Pathway
Created: 2013-09-18
Last Updated: 2019-09-12
Lamivudine (2'-deoxy-3'-thiacytidine, 3TC) is a pyrimidine analog reverse transcriptase enzyme inhibitor used to treat human immunodeficiency virus type I (HIV-1), HIV-2, and Hepatitis B. When metabolized to its active triphosphate form, it competes with deoxycytidine triphosphate for binding to reverse transcriptase, resulting in chain termination when incorporated into the viral DNA. Lamivudine may enter the cells by passive diffusion or by active transported via SLC22A1, SLC22A2, and SLC22A3. Intracellularly, it is phosphorylated to its active triphosphate from via deoxycytidine kinase (3TC to 3TC-monophosphate), followed by cytidine monophosphate/deoxycytidine monophosphate kinase (3TC-monophosphate to 3TC-diphosphate), then 3'-phosphoglycerate kinase or nucleoside diphosphate kinase (3TC-diphosphate to 3TC-triphosphate). Dephosphorylation can occur via phosphatases or salvage pathways. Lamivudine is actively transported out of cell by efflux transporters ABCB1, ABCC1, ABCC2, ABCC3, ABCC4 and ABCG2 and primarily excreted unchanged in the urine.
References
Lamivudine Pathway References
[PharmgKB](http://www.pharmgkb.org/pathway/PA165860384)
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