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Characterization of the organic cation transporter SLC22A16: a doxorubicin importer

Mitsunori Okabe1, Michiaki Unno, Hideo Harigae

  • 1Division of General and Alimentary Tract Surgery, Department of Surgery, Tohoku University School of Medicine, Japan. okabem@mail.nih.gov

Biochemical and Biophysical Research Communications
|June 21, 2005
PubMed

Insights

The organic cation transporter SLC22A16 facilitates doxorubicin uptake in cancer cells, enhancing sensitivity to this anticancer drug. This finding offers new therapeutic strategies for hematological malignancies.

Area of Science:

  • Pharmacology
  • Molecular Biology
  • Oncology

Background:

  • Drug resistance in cancer is often mediated by efflux transporters that reduce intracellular drug accumulation.
  • Understanding influx transporters is crucial for developing strategies to overcome drug resistance.
  • SLC22A16 is an organic cation transporter whose role in drug transport is not fully understood.

Purpose of the Study:

  • To characterize the expression profile and pharmacological function of the organic cation transporter SLC22A16.
  • To determine if SLC22A16 plays a role in the uptake of anticancer drugs, specifically doxorubicin.
  • To investigate the potential of SLC22A16 as a therapeutic target for hematological malignancies.

Main Methods:

  • Quantitative real-time RT-PCR was used to analyze SLC22A16 expression in patient samples.
  • Xenopus oocytes expressing SLC22A16 were used to study doxorubicin import kinetics.
  • Cytotoxic assays were performed on leukemic Jurkat cells overexpressing SLC22A16.

Main Results:

  • SLC22A16 is expressed in primary acute leukemia samples.
  • SLC22A16 mediates saturable, dose-dependent uptake of doxorubicin with an apparent Km of 5.2+/-0.4 microM.
  • Leukemic cells overexpressing SLC22A16 showed increased sensitivity to doxorubicin treatment.

Conclusions:

  • SLC22A16 functions as an influx transporter for doxorubicin in cancer cells.
  • SLC22A16 expression in leukemia suggests its involvement in drug response.
  • Targeting SLC22A16 may represent a novel therapeutic approach for hematological cancers.

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