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- W2076448522 abstract "The functionality of human erythrocyte nucleoside transporter ENT1 was examined at ice-cold temperatures (ICT; measured temperature, 0.5-0.7°C) using rightside-out membrane vesicles (ROVs). The uptake of uridine, an ENT1 substrate, showed saturation kinetics and was inhibited by S-(4-nitrobenzyl)-6-thioinosine (NBMPR), a specific ENT1 inhibitor, at both 23°C and ICT. [3H]Uridine uptake was markedly trans-stimulated by preloading ROVs with unlabeled uridine or ribavirin, another ENT1 substrate, and the overshoot phenomenon was observed at ICT. Similarly, [3H]ribavirin uptake was markedly trans-stimulated by unlabeled ribavirin or uridine at ICT. The trans-stimulated uptake of [3H]uridine at ICT was inhibited by ENT1 inhibitors/substrates such as NBMPR, dipyridamole, adenosine, and ribavirin in a concentration-dependent manner. The inhibition of [3H]uridine uptake by NBMPR and dipyridamole at ICT was also observed in intact red blood cells. Like uridine uptake, [3H]d-glucose uptake by ROVs, which is mediated by facilitative glucose transporter GLUT1, was trans-stimulated by unlabeled d-glucose at ICT, and the over-shoot phenomenon was observed. In contrast, the ability of ATP-dependent transport of 5-(and-6)-carboxy-2′,7′-dichlorofluorescein via multidrug resistance-associated protein 5 in inside-out membrane vesicles disappeared at ICT. These results clearly indicate that human erythrocyte transporters such as ENT1 function even at very low temperatures near 0°C. The significance of these findings in transporter research is discussed." @default.
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- W2076448522 date "2010-01-01" @default.
- W2076448522 modified "2023-09-27" @default.
- W2076448522 title "Human Erythrocyte Nucleoside Transporter ENT1 Functions at Ice-cold Temperatures" @default.
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- W2076448522 doi "https://doi.org/10.2133/dmpk.dmpk-09-rg-099" @default.
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