Interaction of human organic anion transporters with various cephalosporin antibiotics

European Journal of Pharmacology
Michio TakedaHitoshi Endou

Abstract

Cephalosporin antibiotics are thought to be excreted into the urine via organic anion transporters (OATs). The purpose of this study was to elucidate the interaction of human-OATs with various cephalosporin antibiotics, using proximal tubule cells stably expressing human-OAT1, human-OAT3 and human-OAT4. Human-OAT1 and human-OAT3 are localized to the basolateral side of the proximal tubule, whereas human-OAT4 is localized to the apical side. The cephalosporin antibiotics tested were cephalothin, cefoperazone, cefazolin, ceftriaxone, cephaloridine, cefotaxime, cefadroxil and cefamandole. All of these cephalosporin antibiotics significantly inhibited organic anion uptake mediated by human-OAT1, human-OAT3 and human-OAT4. Kinetic analysis revealed that these inhibitions were competitive. The inhibition constant (K(i)) values of cefoperazone, cefazolin, ceftriaxone and cephaloridine for human-OAT1 were much lower than those for human-OAT3 and human-OAT4, whereas the K(i) values of cephalothin and cefotaxime for human-OAT3 were much lower than those for human-OAT1 and human-OAT4. Human-OAT4 mediated the bidirectional transport of estrone sulfate, an optimal substrate for human-OAT4. These results suggest that human-OAT1, human-OAT3 a...Continue Reading

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