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J Am Soc Nephrol 13:848-857, 2002
© 2002 American Society of Nephrology

Immunolocalization of Multispecific Organic Anion Transporters, OAT1, OAT2, and OAT3, in Rat Kidney

Ryoji Kojima*, Takashi Sekine{dagger}, Masanao Kawachi*, Seok Ho Cha{ddagger}, Yoshio Suzuki* and Hitoshi Endou{ddagger}

*Department of Pharmacology, Faculty of Pharmacy, Meijo University, Nagoya, Japan; {dagger}Department of Pediatrics, Faculty of Medicine, The University of Tokyo, Tokyo, Japan; and {ddagger}Department of Pharmacology and Toxicology, Kyorin University School of Medicine, Tokyo, Japan.

Correspondence to: Prof. Hitoshi Endou, Department of Pharmacology and Toxicology, Kyorin University School of Medicine, 6-20-2 Shinkawa, Mitaka, Tokyo 181-8611, Japan. Phone: 81-422-47-5511, ext. 3451; Fax: 81-422-79-1321; E-mail: endouh{at}kyorin-u.ac.jp

ABSTRACT. Recently, a family of multispecific organic anion transporters has been identified, and several isoforms have been reported. However, the physiologic and pharmacologic roles of each isoform, except OAT1, in the transepithelial transport of organic anions in the kidney remain to be elucidated. To address this issue, it is essential to determine the intrarenal distribution and membrane localization of each OAT isoform along the nephron. In this study, the intrarenal distributions of rOAT1, rOAT2, and rOAT3 were investigated by an immunofluorescence method that used frozen rat serial kidney sections. Confocal microscopic analysis showed that immunoreactivity for rOAT1 was detected exclusively in the proximal tubules (S1, S2, S3) in the cortex with basolateral membrane staining. rOAT2 was detected in the apical surface of the tubules in the medullary thick ascending limb of Henle’s loop (MTAL) and cortical and medullary collecting ducts (CD). rOAT3 was localized in the basolateral digitation of the cell membrane in all the segments (S1, S2, and S3) of the proximal tubules, MTAL, cortical TAL, connecting tubules, and cortical and medullary CD. These results on the distribution of each OAT isoform will facilitate the understanding of the role of OATs in the renal processing of organic anions.




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