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J Am Soc Nephrol 13:595-603, 2002
© 2002 American Society of Nephrology

The MRP4/ABCC4 Gene Encodes a Novel Apical Organic Anion Transporter in Human Kidney Proximal Tubules: Putative Efflux Pump for Urinary cAMP and cGMP

Rémon A. M. H. van Aubel*, Pascal H. E. Smeets*, Janny G. P. Peters*, René J. M. Bindels{dagger} and Frans G. M. Russel*

Departments of *Pharmacology and Toxicology and {dagger}Cell Physiology, Nijmegen Center for Molecular Life Sciences, Nijmegen, The Netherlands.

Correspondence to Dr. Frans G. M. Russel, Department of Pharmacology and Toxicology 233, Nijmegen Center for Molecular Life Sciences, P.O. Box 9101, 6500 HB Nijmegen, The Netherlands. Phone: +31-24-3613691/3616892; Fax: +31-24-3614214; E-mail: F.Russel{at}farm.kun.nl

ABSTRACT. The cyclic nucleotides cAMP and cGMP play key roles in cellular signaling and the extracellular regulation of fluid balance. In the kidney, cAMP is excreted across the apical proximal tubular membrane into urine, where it reduces phosphate reabsorption through a dipyridamole-sensitive mechanism that is not fully understood. It has long been known that this cAMP efflux pathway is dependent on ATP and is inhibited by probenecid. However, its identity and whether cGMP shares the same transporter have not been established. Here the expression, localization, and functional properties of human multidrug resistance protein 4 (MRP4) are reported. MRP4 is localized to the proximal tubule apical membrane of human kidney, and membrane vesicles from Sf9 cells expressing human MRP4 exhibit ATP-dependent transport of [3H]cAMP and [3H]cGMP. Both probenecid and dipyridamole are potent MRP4 inhibitors. ATP-dependent [3H]methotrexate and [3H]estradiol-17ß-D-glucuronide transport by MRP4 and interactions with the anionic conjugates S-(2,4-dinitrophenyl)-glutathione, N-acetyl-(2,4-dinitrophenyl)-cysteine, {alpha}-naphthyl-ß-D-glucuronide, and p-nitrophenyl-ß-D-glucuronide are also demonstrated. In kidneys of rats deficient in the apical anionic conjugate efflux pump Mrp2, Mrp4 expression is maintained at the same level. It is concluded that MRP4 is a novel apical organic anion transporter and the putative efflux pump for cAMP and cGMP in human kidney proximal tubules.




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Multidrug Resistance Protein (MRP) 4- and MRP 5-Mediated Efflux of 9-(2-Phosphonylmethoxyethyl)adenine by Microglia
J. Pharmacol. Exp. Ther., June 1, 2004; 309(3): 1221 - 1229.
[Abstract] [Full Text] [PDF]


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Am. J. Physiol. Renal Physiol.Home page
K. W. Beyenbach
Kidneys sans glomeruli
Am J Physiol Renal Physiol, May 1, 2004; 286(5): F811 - F827.
[Abstract] [Full Text] [PDF]


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J. Pharmacol. Exp. Ther.Home page
H. Hasannejad, M. Takeda, K. Taki, H. J. Shin, E. Babu, P. Jutabha, S. Khamdang, M. Aleboyeh, M. L. Onozato, A. Tojo, et al.
Interactions of Human Organic Anion Transporters with Diuretics
J. Pharmacol. Exp. Ther., March 1, 2004; 308(3): 1021 - 1029.
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Am. J. Physiol. Renal Physiol.Home page
C. Kneuer, K. U. Honscha, and W. Honscha
Sodium-dependent methotrexate carrier-1 is expressed in rat kidney: cloning and functional characterization
Am J Physiol Renal Physiol, March 1, 2004; 286(3): F564 - F571.
[Abstract] [Full Tex