title: [3H]dipyridamole binding to nucleoside transporters from guinea-pig and rat lung.
abstract: Membranes from guinea-pig lung exhibited high-affinity binding of [3H]dipyridamole, a potent inhibitor of nucleoside transport. Binding (apparent KD 2 nM) was inhibited by the nucleoside-transport inhibitors nitrobenzylthioinosine (NBMPR), dilazep and lidoflazine and by the transported nucleosides uridine and adenosine. In contrast, there was no detectable high-affinity binding of [3H]dipyridamole to lung membranes from the rat, a species whose nucleoside transporters exhibit a low sensitivity to dipyridamole inhibition. Bmax. values for high-affinity binding of [3H]dipyridamole and [3H]NBMPR to guinea-pig membranes were similar, suggesting that these structurally unrelated ligands bind to the NBMPR-sensitive nucleoside transporter with the same stoichiometry.
mesh_terms: D000818:Animals; D002352:Carrier Proteins / Q000378:metabolism*; D002462:Cell Membrane / Q000187:drug effects / Q000378:metabolism; D004109:Dilazep / Q000494:pharmacology; D004176:Dipyridamole / Q000378:metabolism*; D006168:Guinea Pigs; D008013:Lidoflazine / Q000494:pharmacology; D008168:Lung / Q000187:drug effects / Q000378:metabolism*; D008297:Male; D008565:Membrane Proteins / Q000378:metabolism*; D033703:Nucleoside Transport Proteins; D009705:Nucleosides / Q000494:pharmacology; D051381:Rats; D011919:Rats, Inbred Strains; D013868:Thioinosine / Q000031:analogs & derivatives / Q000494:pharmacology
chemical_list: D002352:Carrier Proteins; D008565:Membrane Proteins; D033703:Nucleoside Transport Proteins; D009705:Nucleosides; D013868:Thioinosine; D004176:Dipyridamole; D004109:Dilazep; C001789:4-nitrobenzylthioinosine; D008013:Lidoflazine