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- W2808090295 abstract "Chronic exposure to cadmium impairs various renal tubular functions, including organic acid (anion) secretion. To investigate the mechanism of cadmium-induced alterations in the organic anion transport system, kinetics of p-aminohippurate (PAH) uptake was studied in renal cortical basolateral membrane vesicles (BLMV) isolated from cadmium-intoxicated rats (adult male Sprague-Dawley). Cadmium intoxication was induced by subcutaneous injections of $CdCl_{2}$ (2 mg Cd/kg per day) for 3 weeks. The renal plasma membrane vesicles were prepared by Percoll gradient centrifugation. The vesicular uptake of $^{14}C$ -PAH was determined by rapid filtration technique using Millipore filter. Cadmium intoxication resulted in a marked attenuation of $Na^{+}$ -dependent, ${alpha}$ -ketoglutarate ( ${alpha}$ KG)-driven PAH uptake with no changes in $Na^{+}$ and ${alpha}$ KG-independent transport component. Kinetic analysis indicated that Vmax, but not Km, of the $Na^{+}$ -dependent, ${alpha}$ KG-driven component was reduced. A similar reduction of $Na^{+}$ -dependent, ${alpha}$ KG-driven PAH uptake was observed in normal membrane vesicles directly exposed to inorganic cadmium in vitro, and this was accompanied by an inhibition of both $Na^{+}$ -dependent ${alpha}$ KG uptake and ${alpha}$ KG-PAH exchange activity. These results indicate that during chronic exposure to cadmium, free cadmium ions liberated in the proximal tubular cytoplasm directly interact with the basolateral membrane and impair the active transport capacity for organic anions, most likely due to an inhibition of both $Na^{+}$ -dicarboxylate cotransporter and dicarboxylate-organic anion antiporter activities." @default.
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- W2808090295 date "1996-01-01" @default.
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- W2808090295 title "Effect of Cadmium on Organic Acid Transport System in Renal Basolateral Membrane" @default.
- W2808090295 hasPublicationYear "1996" @default.
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