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Vol. 302, Issue 2, 483-489, August 2002

Gender Difference in the Urinary Excretion of Organic Anions in Rats

Yukio Kato, Kiyoka Kuge, Hiroyuki Kusuhara, Peter J. Meier and Yuichi Sugiyama

Graduate School of Pharmaceutical Sciences, University of Tokyo, Tokyo, Japan (Y.K., K.K., H.K., Y.S.); and Division of Clinical Pharmacology and Toxicology, Department of Medicine, University Hospital, Zurich, Switzerland (P.J.M.)

This study was aimed at clarifying the gender differences in the urinary excretion of organic anions and the gene expression of organic anion transporters in rats. The renal clearance with regard to the plasma concentration (CLurine,p) of taurocholate, dibromosulfophthalein (DBSP), and zenarestat, all substrates and/or inhibitors of organic anion transporting polypeptide 1 (Oatp1), was much higher in female than in male rats. The following results imply that the transport system(s) for the reabsorption of zenarestat across the luminal side exhibits a gender difference: 1) the renal uptake clearance assessed by an in vivo integration plot analysis of zenarestat from the blood side does not show any clear gender differences; 2) the renal clearance with regard to the kidney concentration (CLurine,k) of zenarestat in female rats was approximately 30 times higher than in male rats; and 3) both CLurine,p and CLurine,k were increased in male rats by the coinfusion of DBSP, which is an inhibitor of organic anion transporters. Northern and Western blot analyses confirmed a previous finding that the gene expression of Oatp1, which is localized at the apical plasma membrane of the kidney, was much higher in the kidneys of male rats. Overall, a gender difference in urinary excretion is commonly observed for several organic anions, including Oatp1 substrates and inhibitors, and Oatp1 and/or transporters that have a similar substrate specificity to Oatp1 could be involved in such a phenomenon involving its substrates.

0022-3565/02/3022-0483$07.00/0
THE JOURNAL OF PHARMACOLOGY AND EXPERIMENTAL THERAPEUTICS
Copyright © 2002 by The American Society for Pharmacology and Experimental Therapeutics


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