Transport activity of human MRP3 expressed in Sf9 cells: comparative studies with rat MRP3.

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Akita H, Suzuki H, Hirohashi T, Takikawa H, Sugiyama Y

Transport activity of human MRP3 expressed in Sf9 cells: comparative studies with rat MRP3.

Pharm Res. 2002 Jan;19(1):34-41.

PubMed ID

11837698 [ View in PubMed

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Abstract

PURPOSE: Multidrug resistance-associated protein 3 (MRP3) was initially cloned as a hepatic transporter induced under cholestatic/ hyperbilirubinemic conditions. In the present study, transport property of human MRP3 (hMRP3) was compared with that of rat MRP3 (rMRP3). METHODS: Adenosine 5' triphosphate (ATP)-dependent uptake of several organic anions into the membrane vesicles isolated from the Sf9 cells expressing hMRP3 and rMRP3 was measured by rapid filtration technique. RESULTS: ATP-dependent uptake of glucuronide conjugates, glutathione conjugates. and [3H]methotrexate (MTX) was stimulated by infection of cDNAs for hMRP3 and rMRP3. The mean (+/- SE) Km values for the uptake of 17beta estradiol 17beta-D-glucuronide ([3H]E(2)17 betaG) by hMRP3 and rMRP3 were 42.9 +/- 4.3 microM and 33.4 +/- 2.2 microM, respectively. Although the Ki values of glucuronides on the uptake of E217betaG were similar in humans and rats, hMRP3 exhibited higher Ki values toward MTX. In addition, although glycocholate and taurolithocholate 3-sulfate (TLC-S) were transported by both hMRP3 and rMRP3, taurocholate was only transported to a significant degree by rMRP3. Moreover, the inhibitory effect of taurocholate and glycocholate on the transport of E(2)17beta3G was much more potent in rMRP3 compared to hMRP3. CONCLUSION: Collectively, the substrate specificity of hMRP3 resembles that of rMRP3 although differences were observed, particularly in bile acid transport.

DrugBank Data that Cites this Article

Drug Transporters

Drug	Transporter	Kind	Organism	Pharmacological Action	Actions
Methotrexate	Canalicular multispecific organic anion transporter 2	Protein	Humans	Unknown	Substrate Inhibitor	Details
Taurocholic acid	Canalicular multispecific organic anion transporter 2	Protein	Humans	Unknown	Substrate Inhibitor	Details