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Research ArticleArticle

OATP1B3 Expression and Function is Modulated by Coexpression with OCT1, OATP1B1, and NTCP

Yuchen Zhang, Melissa Ruggiero and Bruno Hagenbuch
Drug Metabolism and Disposition August 2020, 48 (8) 622-630; DOI: https://doi.org/10.1124/dmd.119.089847
Yuchen Zhang
Department of Pharmacology, Toxicology, and Therapeutics, The University of Kansas Medical Center, Kansas City, Kansas
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Melissa Ruggiero
Department of Pharmacology, Toxicology, and Therapeutics, The University of Kansas Medical Center, Kansas City, Kansas
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Bruno Hagenbuch
Department of Pharmacology, Toxicology, and Therapeutics, The University of Kansas Medical Center, Kansas City, Kansas
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Abstract

Organic anion transporting polypeptide (OATP) 1B3 is a drug transporter expressed at the basolateral membrane of human hepatocytes. Along with other transporters, including OATP1B1, Na+/taurocholate cotransporting polypeptide (NTCP), and organic cation transporter (OCT) 1, it is responsible for the uptake of endo- and xenobiotics into hepatocytes. Our previous studies demonstrated that OATP1B3 can form hetero-oligomers with OATP1B1 in human embryonic kidney 293T (HEK293) cells and with NTCP in both HEK293 cells and frozen human liver sections. To further characterize the hetero-oligomerization of OATP1B3, we investigated OCT1 as a potential interacting partner and determined the functional consequences of OATP1B3 hetero-oligomerization. We demonstrated interactions between OATP1B3 and OCT1 by coimmunoprecipitation with an anti-OATP1B3 antibody from human hepatocytes. In addition, we visualized the interaction using the proximity ligation assay in both HEK293 cells and in frozen human liver sections. We investigated the functional consequences of OATP1B3 hetero-oligomerization by measuring the OATP1B3 plasma membrane expression and the uptake of the OATP1B3 selective substrate cholecystokinin-8 (CCK-8) in the absence and presence of OATP1B1, NTCP, and OCT1. A significant decrease of OATP1B3 plasma membrane expression was observed after coexpression with OCT1, whereas coexpression with OATP1B1 or NTCP resulted in an increase of plasma membrane expression. With respect to transport, coexpression of OCT1 increased the apparent turnover rate of OATP1B3, whereas coexpression of OATP1B1 or NTCP decreased it. These findings demonstrated that coexpression of OATP1B3 with OATP1B1, NTCP, and OCT1 in HEK293 cells results in a transporter-dependent modification of OATP1B3-mediated CCK-8 transport and suggest that functional results obtained in single transporter overexpressing cell lines over- or underestimate OATP1B3 function in human hepatocytes.

SIGNIFICANCE STATEMENT Coexpression of organic anion transporting polypeptide (OATP) 1B3 with organic cation transporter (OCT) 1, Na+/taurocholate cotransporting polypeptide, or OATP1B1 in human embryonic kidney 293T cells affects its expression level and function. When OCT1 is knocked down in human hepatocytes, function of OATP1B3 goes up. These results suggest that protein-protein interactions can affect the expression and function of the involved proteins, and thus single transporter expression systems might lead to over- or underestimation of drug-drug interactions.

Footnotes

    • Received October 27, 2019.
    • Accepted May 13, 2020.
  • This work was supported by National Institute of General Medical Sciences [R01GM077336], [P20GM103549], and [P30GM118247].

  • https://doi.org/10.1124/dmd.119.089847.

  • Copyright © 2020 by The American Society for Pharmacology and Experimental Therapeutics
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Drug Metabolism and Disposition: 48 (8)
Drug Metabolism and Disposition
Vol. 48, Issue 8
1 Aug 2020
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Research ArticleArticle

Hetero-Oligomerization Affects OATP1B3 Expression and Function

Yuchen Zhang, Melissa Ruggiero and Bruno Hagenbuch
Drug Metabolism and Disposition August 1, 2020, 48 (8) 622-630; DOI: https://doi.org/10.1124/dmd.119.089847

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Research ArticleArticle

Hetero-Oligomerization Affects OATP1B3 Expression and Function

Yuchen Zhang, Melissa Ruggiero and Bruno Hagenbuch
Drug Metabolism and Disposition August 1, 2020, 48 (8) 622-630; DOI: https://doi.org/10.1124/dmd.119.089847
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