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Research ArticleGASTROINTESTINAL, HEPATIC, PULMONARY, AND RENAL

Sex Differences in the mRNA, Protein, and Functional Expression of Organic Anion Transporter (Oat) 1, Oat3, and Organic Cation Transporter (Oct) 2 in Rabbit Renal Proximal Tubules

Carlotta E. Groves, Wendy B. Suhre, Nathan J. Cherrington and Stephen H. Wright
Journal of Pharmacology and Experimental Therapeutics February 2006, 316 (2) 743-752; DOI: https://doi.org/10.1124/jpet.105.094979
Carlotta E. Groves
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Wendy B. Suhre
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Nathan J. Cherrington
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Stephen H. Wright
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Abstract

Sex differences in transport of the organic anion (OA) substrate p-aminohippurate (PAH) and the organic cation (OC) substrate tetraethylammonium (TEA) have been recognized for some time. In the rat kidney, androgens up-regulate and estrogens down-regulate PAH and TEA transport, which correlate with similar changes in mRNA and protein expression for the renal basolateral membrane transporters organic anion transporter (Oat) 1 and organic cation transporter (Oct) 2. However, these sex differences are not readily demonstrated in other species. The present study characterizes the kinetics of basolateral membrane PAH, estrone sulfate (ES), and TEA uptake in renal proximal tubule (RPT) suspensions isolated from female and male rabbits to compare functional expression of transport with mRNA and protein expression for rbOat1, rbOat3, and rbOct2. Although rbOat1-rbOat3 mRNA expression exhibited developmental differences, no sex differences in mRNA levels were observed. Oat1 and Oat3 protein expression in RPT suspensions also was similar between adult female and male rabbits. In contrast, rbOct1 and rbOct2 mRNA levels did not show developmental differences, but rbOct2 mRNA expression was greater in adult male than female rabbits. However, the sex difference in rbOct2 mRNA level did not translate to rbOct2 protein expression. Importantly, functional expression of Oat1, Oat3, and Oct2 transport as measured by kinetics (Jmax and Kt) of PAH, ES, and TEA uptake was similar between adult male and female rabbits, and correlated with rbOat1, rbOat3, and rbOct2 protein expression. Thus, unlike rodents, rabbit renal OA and OC transport does not exhibit sex differences, pointing to the need for caution in extrapolating transport-related sex differences between species.

Footnotes

  • This work was supported in part by Grants DK062097, ES04940, and ES06694 from the National Institutes of Health.

  • doi:10.1124/jpet.105.094979.

  • ABBREVIATIONS: OA, organic anion; OC, organic cation; PAH, p-aminohippurate; TEA, tetraethylammonium; Oat, organic anion transporter; Oct, organic cation transporter; ES, estrone sulfate; RPT, renal proximal tubule; bDNA, branched DNA.

    • Received August 31, 2005.
    • Accepted October 24, 2005.
  • The American Society for Pharmacology and Experimental Therapeutics
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Journal of Pharmacology and Experimental Therapeutics: 316 (2)
Journal of Pharmacology and Experimental Therapeutics
Vol. 316, Issue 2
1 Feb 2006
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Research ArticleGASTROINTESTINAL, HEPATIC, PULMONARY, AND RENAL

Sex Differences in the mRNA, Protein, and Functional Expression of Organic Anion Transporter (Oat) 1, Oat3, and Organic Cation Transporter (Oct) 2 in Rabbit Renal Proximal Tubules

Carlotta E. Groves, Wendy B. Suhre, Nathan J. Cherrington and Stephen H. Wright
Journal of Pharmacology and Experimental Therapeutics February 1, 2006, 316 (2) 743-752; DOI: https://doi.org/10.1124/jpet.105.094979

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Research ArticleGASTROINTESTINAL, HEPATIC, PULMONARY, AND RENAL

Sex Differences in the mRNA, Protein, and Functional Expression of Organic Anion Transporter (Oat) 1, Oat3, and Organic Cation Transporter (Oct) 2 in Rabbit Renal Proximal Tubules

Carlotta E. Groves, Wendy B. Suhre, Nathan J. Cherrington and Stephen H. Wright
Journal of Pharmacology and Experimental Therapeutics February 1, 2006, 316 (2) 743-752; DOI: https://doi.org/10.1124/jpet.105.094979
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