OCTN1 Is a High-Affinity Carrier of Nucleoside Analogues.

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Drenberg CD, Gibson AA, Pounds SB, Shi L, Rhinehart DP, Li L, Hu S, Du G, Nies AT, Schwab M, Pabla N, Blum W, Gruber TA, Baker SD, Sparreboom A

OCTN1 Is a High-Affinity Carrier of Nucleoside Analogues.

Cancer Res. 2017 Apr 15;77(8):2102-2111. doi: 10.1158/0008-5472.CAN-16-2548. Epub 2017 Feb 16.

PubMed ID

28209616 [ View in PubMed

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Abstract

Resistance to xenobiotic nucleosides used to treat acute myeloid leukemia (AML) and other cancers remains a major obstacle to clinical management. One process suggested to participate in resistance is reduced uptake into tumor cells via nucleoside transporters, although precise mechanisms are not understood. Through transcriptomic profiling, we determined that low expression of the ergothioneine transporter OCTN1 (SLC22A4; ETT) strongly predicts poor event-free survival and overall survival in multiple cohorts of AML patients receiving treatment with the cytidine nucleoside analogue cytarabine. Cell biological studies confirmed OCTN1-mediated transport of cytarabine and various structurally related cytidine analogues, such as 2'deoxycytidine and gemcitabine, occurs through a saturable process that is highly sensitive to inhibition by the classic nucleoside transporter inhibitors dipyridamole and nitrobenzylmercaptopurine ribonucleoside. Our findings have immediate clinical implications given the potential of the identified transport system to help refine strategies that could improve patient survival across multiple cancer types where nucleoside analogues are used in cancer treatment. Cancer Res; 77(8); 2102-11. (c)2017 AACR.

DrugBank Data that Cites this Article

Drug Transporters

Drug	Transporter	Kind	Organism	Pharmacological Action	Actions
Cytarabine	Solute carrier family 22 member 4	Protein	Humans	Unknown	Substrate	Details