| Assay Method Information | |
| | Determination of Adenosine Transport Activity |
| Description: | To measure adenosine transport activity of ENT-1 mammalian cells, stable cells expressing the mouse ENT-1 transporter were plated on day 1 in 96-well culture plates at the density of 60,000 cells/well, in complete DMEM/F12 medium supplemented with glutamax, 10% FBS and 10 μg/ml puromycin. On day 2, the medium was aspirated and the cells were washed twice with uptake buffer (10 mM Hepes-Tris, pH 7.4 containing 150 mM NaCl, 1 mMCaCl2, 2.5 mM KCl, 2.5 mM MgSO4, 10 mM D-glucose) (UB). For inhibition experiments, cells were then incubated at RT with various concentrations of compounds with 1% DMSO final. Non-specific uptake was defined in the presence of 10 μM S-(4-Nitrobenzyl)-6-thioinosine (NBTI, Sigma Cat #N2255).A solution containing [2,8-3H]-adenosine 6 nM (40 Ci/mmol, American Radiolabeled chemicals Inc, Cat #ART 0287A) was then immediately added to the wells. The plates were then incubated for 20 min with gentle shaking and the reaction was stopped by aspiration of the mixture and washing (three times) with ice-cold UB. The cells were lysed by the addition of scintillation liquid, shaken 3 hours and the radioactivity in the cells was estimated using a microplates scintillation counter (TopCount NXT, Packard). |
| Affinity data for this assay | |
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