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Human organic anion transporters function as a high-capacity transporter for p-cresyl sulfate, a uremic toxin

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Abstract

Background

Recent clinical studies have shown that increased serum levels of p-cresyl sulfate (PCS), a uremic toxin, are associated with the progression of chronic kidney disease (CKD) and cardiovascular outcomes. Using rat renal cortical slices, we previously reported that the rat organic anion transporter (OAT) could play a key role in the renal tubular secretion of PCS. However, no information is currently available regarding the transport of PCS via human OAT (hOAT) isoforms, hOAT1 and hOAT3.

Methods

Uptake experiments of PCS were performed using HEK293 cells, which stably express hOAT1 or hOAT3.

Results

PCS was taken up by hOAT1/HEK293 and hOAT3/HEK293 cells in a time- and concentration-dependent manner. The apparent K m for the hOAT1-mediated transport of PCS was 128 μM, whereas in hOAT3/HEK293, saturation was not observed at the highest tested PCS concentration of 5 mM. Probenecid, an OAT inhibitor, inhibited PCS transport by hOAT1 and hOAT3. The uptake of p-aminohippurate by hOAT1 and estron-3-sulfate by hOAT3 was decreased with increasing PCS concentration. The apparent 50 % inhibitory concentrations for PCS were 690 and 485 μM for hOAT1 and hOAT3, respectively.

Conclusion

PCS is a substrate for hOAT1 and hOAT3, and hOAT1 and hOAT3 appear to play a physiological role as a high-capacity PCS transporter. Since hOATs are expressed not only in the kidneys, but also in blood vessels and osteoblasts, etc., these findings are of great significance in terms of elucidating the renal clearance, tissue disposition of PCS and the mechanism of its toxicity in CKD.

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Acknowledgments

This work was supported by a Grant-in-Aid for Scientific Research from Japan Society for the Promotion of Science (JSPS) [KAKENHI 23790187].

Conflict of interest

The authors declare no conflict of interest.

Author information

Authors and Affiliations

  1. Department of Biopharmaceutics, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Chuo-ku, Kumamoto, 862-0973, Japan

    Hiroshi Watanabe, Yoshiaki Sakaguchi, Ryusei Sugimoto, Yu Ishima & Toru Maruyama

  2. School of Pharmacy, Center for Clinical Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Chuo-ku, Kumamoto, 862-0973, Japan

    Hiroshi Watanabe, Yu Ishima & Toru Maruyama

  3. Drug Development Service Segment, Mitsubishi Chemical Medicine Corporation, 14-1 Sunayama, Kamisu-shi, Ibaraki, 314-0255, Japan

    Ken-ichi Kaneko & Hiroshi Iwata

  4. Department of Organic Chemistry, Graduate School of Pharmaceutical Sciences, Kumamoto University, 5-1 Oe-honmachi, Chuo-ku, Kumamoto, 862-0973, Japan

    Shunsuke Kotani & Makoto Nakajima

  5. Faculty of Pharmaceutical Sciences, Sojo University, 4-22-1 Ikeda, Kumamoto, 860-0822, Japan

    Masaki Otagiri

  6. DDS Research Institute, Sojo University, 4-22-1 Ikeda, Kumamoto, 860-0822, Japan

    Masaki Otagiri

Authors
  1. Hiroshi Watanabe
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  2. Yoshiaki Sakaguchi
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  8. Yu Ishima
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  9. Masaki Otagiri
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  10. Toru Maruyama
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Corresponding author

Correspondence to Toru Maruyama.

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Watanabe, H., Sakaguchi, Y., Sugimoto, R. et al. Human organic anion transporters function as a high-capacity transporter for p-cresyl sulfate, a uremic toxin. Clin Exp Nephrol 18, 814–820 (2014). https://doi.org/10.1007/s10157-013-0902-9

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  • DOI: https://doi.org/10.1007/s10157-013-0902-9

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