Journal: The Journal of Pharmacology and Experimental Therapeutics
Article Title: [ 3 H]Dopamine Uptake through the Dopamine and Norepinephrine Transporters is Decreased in the Prefrontal Cortex of Transgenic Mice Expressing HIV-1 Transactivator of Transcription Protein
doi: 10.1124/jpet.120.266023
Figure Lengend Snippet: Saturation binding of [3H]WIN 35,428 or [3H]nisoxetine in the PFC of iTat-tg mice after 7 days’ administration of saline (SAL) or Dox (DOX). For [3H]WIN 35,428 binding to DAT, synaptosomes were incubated in assay buffer with one of six concentrations of [3H]WIN 35,428 (1–30 nM, final concentration) and 1 µM desipramine on ice for 2 hours. Nonspecific binding was determined in the presence of 10 µM cocaine. For [3H]nisoxetine binding to NET, synaptosomes were incubated in assay buffer with one of six concentrations of nisoxetine (0.5–30 nM, final concentration) along with a fixed concentration of [3H]nisoxetine (3 nM) and 0.1 µM GBR12909 on ice for 2 hours. Nonspecific binding was determined in the presence of 10 µM desipramine. The Bmax and Kd values for [3H]WIN 35,428 (A) or [3H]nisoxetine (B) binding to DAT or NET in the PFC of iTat-tg (iTat) mice after 7 days’ administration of saline or Dox were calculated using nonlinear regression analysis with a one-site binding parameter and represent the means ± S.E.M. from five independent experiments. *P < 0.05; **P < 0.01 compared with saline control group. DA turnover rate values were determined for DAT from (C) the Vmax of [3H]DA uptake (Fig. 1A)/Bmax of [3H]WIN 35,428 binding and (D) the Km/Kd of [3H]DA uptake (Fig. 1A)/Bmax of [3H]WIN 35,428 binding and for NET from (E) the Vmax of [3H]DA uptake (Fig. 1B)/Bmax of [3H]nisoxetine binding and (F) the Km/Kd of [3H]DA uptake (Fig. 1B)/Bmax of [3H]nisoxetine binding.
Article Snippet: Samples were separated by 10% SDS-polyacrylamide gel electrophoresis for ∼90 minutes at 125 V. Samples were then transferred to Immobilon-P transfer membranes (0.45-µm pore size; Millipore Co., Bedford, MA) in transfer buffer (50 mM Tris, 250 mM glycine, 3.5 mM SDS) using a Mini Trans-Blot Electrophoretic Transfer Cell (Bio-Rad, Hercules, CA) for 90 minutes at 75 V. The membranes were then incubated with blocking buffer (5% milk powder in PBS containing 0.5% Tween-20) for 1 hour at room temperature, followed by incubation with either goat anti-DAT (C-20 polyclonal antibody, diluted 1:500 in blocking buffer; Santa Cruz) or mouse anti-NET (MAb tech, 05-1 monoclonal antibody, diluted 1:5000 in blocking buffer) overnight at 4°C.
Techniques: Binding Assay, Incubation, Concentration Assay