title: Decreased renal organic anion secretion and plasma accumulation of endogenous organic anions in OAT1 knock-out mice.
abstract: The "classical" organic anion secretory pathway of the renal proximal tubule is critical for the renal excretion of the prototypic organic anion, para-aminohippurate, as well as of a large number of commonly prescribed drugs among other significant substrates. Organic anion transporter 1 (OAT1), originally identified as NKT (Lopez-Nieto, C. E., You, G., Bush, K. T., Barros, E. J. G., Beier, D. R., and Nigam, S. K. (1997) J. Biol. Chem. 272, 6471-6478), has physiological properties consistent with a role in this pathway. However, several other transporters (e.g. OAT2, OAT3, and MRP1) have also been proposed as important PAH transporters on the basis of in vitro studies; therefore, the relative contribution of OAT1 has remained unclear. We have now generated a colony of OAT1 knock-out mice, permitting elucidation of the role of OAT1 in the context of these other potentially functionally redundant transporters. We find that the knock-out mice manifest a profound loss of organic anion transport (e.g. para-aminohippurate) both ex vivo (in isolated renal slices) as well as in vivo (as indicated by loss of renal secretion). In the case of the organic anion, furosemide, loss of renal secretion in the knock-out results in impaired diuretic responsiveness to this drug. These results indicate a critical role for OAT1 in the functioning of the classical pathway. In addition, we have determined the levels of approximately 60 endogenous organic anions in the plasma and urine of wild-type and knock-out mice. This has led to identification of several compounds with significantly higher plasma concentrations and/or lower urinary concentrations in knock-out mice, suggesting the involvement of OAT1 in their renal secretion. We have also demonstrated in xenopus oocytes that some of these compounds interact with OAT1 in vitro. Thus, these latter compounds might represent physiological substrates of OAT1.
authors.affiliation: Department of Medicine, University of California San Diego, La Jolla, California 92093, USA.
authors.forename: Satish A
authors.initials: SA
authors.lastname: Eraly
authors.forename: Volker
authors.initials: V
authors.lastname: Vallon
authors.forename: Duke A
authors.initials: DA
authors.lastname: Vaughn
authors.forename: Jon A
authors.initials: JA
authors.lastname: Gangoiti
authors.forename: Kerstin
authors.initials: K
authors.lastname: Richter
authors.forename: Megha
authors.initials: M
authors.lastname: Nagle
authors.forename: Julio C
authors.initials: JC
authors.lastname: Monte
authors.forename: Timo
authors.initials: T
authors.lastname: Rieg
authors.forename: David M
authors.initials: DM
authors.lastname: Truong
authors.forename: Jeffrey M
authors.initials: JM
authors.lastname: Long
authors.forename: Bruce A
authors.initials: BA
authors.lastname: Barshop
authors.forename: Gregory
authors.initials: G
authors.lastname: Kaler
authors.forename: Sanjay K
authors.initials: SK
authors.lastname: Nigam
mesh_terms: D000818:Animals; D000838:Anions; D001692:Biological Transport; D015152:Blotting, Northern; D004305:Dose-Response Relationship, Drug; D005260:Female; D005838:Genotype; D006439:Hemodynamics; D006579:Heterozygote; D007150:Immunohistochemistry; D007668:Kidney / Q000378:metabolism*; D007700:Kinetics; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D008957:Models, Genetic; D009865:Oocytes / Q000378:metabolism; D027362:Organic Anion Transport Protein 1 / Q000235:genetics* / Q000502:physiology*; D010641:Phenotype; D016133:Polymerase Chain Reaction; D011485:Protein Binding; D011995:Recombination, Genetic; D014981:Xenopus; D014982:Xenopus laevis; D010130:p-Aminohippuric Acid / Q000494:pharmacology
chemical_list: D000838:Anions; D027362:Organic Anion Transport Protein 1; C105033:Slc22a6 protein, mouse; D010130:p-Aminohippuric Acid