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Departments of 1 Pharmacology and Toxicology and 2 Cell Physiology, Faculty of Medical Sciences, University Medical Centre Nijmegen, 6500 HB Nijmegen, The Netherlands
p-Aminohippurate (PAH) is widely used as a model substrate
to characterize organic anion transport in kidney proximal tubules. The
carrier responsible for uptake of PAH across the basolateral membrane
has been cloned and well characterized, whereas transporters mediating
PAH excretion across the brush-border (apical) membrane are yet
unknown. In this study we investigated whether PAH is a substrate for
the apical multidrug resistance protein 2 (Mrp2). Overexpression of
recombinant rabbit Mrp2 in Sf9 cells significantly increased
ATP-dependent [14C]PAH uptake into isolated membrane
vesicles compared with endogenous ATP-dependent uptake. The
Michaelis-Menten constant and maximal velocity for Mrp2-mediated
ATP-dependent [14C]PAH transport were 1.9 ± 0.8 mM
and 187 ± 29 pmol · mg
1 · min
1,
respectively. On the basis of the inhibitory profile, the endogenous ATP-dependent PAH transporter does not appear to be an ortholog of
Mrp2. Together, our results show that Mrp2 is a low-affinity ATP-dependent PAH transporter, indicating that Mrp2 might contribute to
urinary PAH excretion.
proximal tubule; kidney; p-aminohippurate organic anion transport; 2
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