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| | Radioligand In Vitro Binding Assays on Recombinant and Native Tau Protein |
| Description: | [3H]compound binding to Tau protein methods were adapted from Nobuyuki et al (2013). Biological samples as described above (0.2-50 μg proteins per assays) were incubated for 60 min at 25° C. with [3H]compound in 0.2 ml of PBS containing 0.1% bovine serum albumin (Sigma-Aldrich, Diegem, Belgium). At the end of the incubation period, the protein-bound radioligand was recovered by reduced pressure filtration through GF/F glass fiber filters (GE Healthcare, Diegem, Belgium) pre-soaked in 0.1% polyethyleneimine (Sigma-Aldrich, Diegem, Belgium). Filters were washed with at least 4 times the assay volume of ice-cold PBS (pH 7.4). The entire filtration step did not exceed 10 sec The filters were dried and the radioactivity determined by liquid scintillation. Saturation binding assays were carried out using increasing concentrations of [3H]compound (0.5 to 100 nM). Competition binding experiments were carried out at constant [3H]compounds concentration (15 nM) and increasing concentrations of unlabeled competing compounds (10 concentration data point from 10 μM to 0.1 nM). pIC50 were corrected to pKi according to Cheng and Prusoff (1973). In all experiments, the NSB was defined as the residual binding of [3H]compound observed in the presence of 10 μM T807. |
| Affinity data for this assay | |
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