| Assay Method Information | |
| | Determining Vmat2 Inhibitory Activity of a Compound |
| Description: | Examples of techniques for determining the capability of a compound to inhibit VMAT2 are provided below. The procedure is adapted from that described previously (see, e.g., Near, (1986), Mol. Pharmacol. 30: 252-57; Teng, et al., J. Neurochem. 71, 258-65, 1998). Homogenates from human platelets or Sprague-Dawley rat forebrain were prepared by homogenization and then washed by centrifugation as described previously (see, e.g., Hoare et al., (2003) Peptides 24:1881-97). In a total volume of 0.2 mL in low-binding 96-well plates (Corning #3605), twelve concentrations of Compound 1-1 and R,R,R-DHTBZ were competed against 6 nM 3H-dihydrotetrabenezine (American Radiolabeled Chemicals, Kd 2.6 nM) on rat forebrain homogenate (100 μg membrane protein per well) or human platelet homogenate (50 μg membrane protein per well) in VMAT2 binding buffer (Dulbecco's phosphate buffered saline, 1 mM EDTA, pH 7.4). Following incubation at 25° C. for two hours, bound radioligand was collected by rapid filtration onto GF/B glass fiber filters using a Unifilter-96 Harvester (PerkinElmer). Filter plates were pre-treated for 10 minutes with 0.1% polyethylenimine, and following harvesting the filter plates were washed with 800 μl VMAT2 binding buffer. Bound radioligand was quantified by scintillation counting using a Topcount NXT (PerkinElmer). |
| Affinity data for this assay | |
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