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- W2188959897 abstract "We examined the role of the canalicular multispecific organic anion transporter (cMOAT) in the biliary excretion of reduced folate derivatives in vivo and in vitro using normal [Sprague-Dawley rats (SDR)] and mutant [Eisai hyperbilirubinemic rats (EHBR)] rats whose cMOAT is hereditarily deficient. In vivo, the biliary excretion of endogenous tetrahydrofolate (H 4 PteGlu), 5-methyltetrahydrofolate (5-CH 3 -H 4 PteGlu), and 5,10-methylenetetrahydrofolate (5,10-CH 2 -H 4 PteGlu) in EHBR was reduced to 8.2%, 1.9%, and 5.5% of those in SDR, respectively, whereas that of 10-formyltetrahydrofolate (10-HCO-H 4 PteGlu) was detected only in SDR and not in EHBR. Bile drainage caused reduction of endogenous plasma folate concentrations in SDR but not in EHBR. In vitro, significant ATP-dependent uptake of 3 H-labeled 5-CH 3 -H 4 PteGlu into canalicular membrane vesicles was observed only in SDR. This ATP-dependent uptake was saturable with a Michaelis constant ( K m ) value of 126 μM, which was comparable with its inhibitor constant ( K i ) value of 121 μM for the ATP-dependent uptake of a typical cMOAT substrate, 2,4-dinitrophenyl- S-glutathione (DNP-SG). Vice versa, DNP-SG inhibited the uptake of 5-CH 3 -H 4 PteGlu with a K i of 35 μM, which was similar to its K m value. In addition, H 4 PteGlu and 5,10-CH 2 -H 4 PteGlu also inhibited the ATP-dependent uptake of DNP-SG. These results indicate that 5-CH 3 -H 4 PteGlu and other derivatives are transported via cMOAT. Therefore, reduced folate derivatives are the first endogenous substrates for cMOAT that do not contain glutathione, glucuronide, or sulfate moieties." @default.
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- W2188959897 date "1998-10-01" @default.
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- W2188959897 title "Reduced folate derivatives are endogenous substrates for cMOAT in rats" @default.
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- W2188959897 doi "https://doi.org/10.1152/ajpgi.1998.275.4.g789" @default.
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