For detection of the agonism action of the compounds, the
[
35S]GTPcS binding assay was performed at 30 C for 40 min (for
D1 and D2) or 20 min (for 5-HT1A) in reaction buffer containing
50 mM Tris, pH 7.5, 5 mM MgCl2, 1 mM EDTA, 100 mM NaCl, and
1 mM DL-dithiothreitol (DTT). The assay mixture (200 lL) con-
tained 20 lg (for D2) or 30 lg (for D1 and 5-HT1A) of membrane
protein, 0.1 nM [35S]GTPcS, and 40 lM guanosine triphosphate
(GDP) with various concentration of the compound. The antago-
nism effects of the compounds were tested in the existence of
100 lM SKF38393 for D1 or quinpirole for D2 receptor. Nonspecific
binding was measured in the presence of 100 lM 50-guanylimid-
odiphosphate (Gpp(NH)p). The reaction was terminated by addi-
tion of 3 mL of ice-cold washing buffer (50 mM Tris, pH 7.5,
5 mM MgCl2, 1 mM EDTA, and 100 mM NaCl) and was rapidly fil-
tered with GF/C glass fiber filters (Whatman) and rinsed three
times. Filters were dried and radioactivity was determined by li-
quid scintillation counting.
For detection of the agonism action of the compounds, the[35S]GTPcS binding assay was performed at 30 C for 40 min (forD1 and D2) or 20 min (for 5-HT1A) in reaction buffer containing50 mM Tris, pH 7.5, 5 mM MgCl2, 1 mM EDTA, 100 mM NaCl, and1 mM DL-dithiothreitol (DTT). The assay mixture (200 lL) con-tained 20 lg (for D2) or 30 lg (for D1 and 5-HT1A) of membraneprotein, 0.1 nM [35S]GTPcS, and 40 lM guanosine triphosphate(GDP) with various concentration of the compound. The antago-nism effects of the compounds were tested in the existence of100 lM SKF38393 for D1 or quinpirole for D2 receptor. Nonspecificbinding was measured in the presence of 100 lM 50-guanylimid-odiphosphate (Gpp(NH)p). The reaction was terminated by addi-tion of 3 mL of ice-cold washing buffer (50 mM Tris, pH 7.5,5 mM MgCl2, 1 mM EDTA, and 100 mM NaCl) and was rapidly fil-tered with GF/C glass fiber filters (Whatman) and rinsed threetimes. Filters were dried and radioactivity was determined by li-quid scintillation counting.
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