The Tet-On 3G Tetracycline Inducible Gene Expression System (Clontech Laboratories, Inc.) was utilized to generate stable cell lines inducibly expressing HA-α2B-AR in HEK293 cells as described previously17 (link),35 . Briefly, HA-α2B-AR was cloned into the pTRE3G-TRES vector at the BglII and ClaI restriction sites and co-transfected with the PLKO.1 vector in HEK293 cells using Lipofectamine 2000. Inducible α2B-AR expression was verified by intact cell ligand binding assays, immunoblotting and confocal microscopy35 . The current study uses a cell line that expresses 8.5 × 105 receptors per cell.
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