Binding Assay: The [3H]-methyllycaconitine binding assay is a modification of the method described by Davies et al. in Neuropharmacol. 1999, 38, 679-690.Rat brain tissue (hippocampus or whole brain) is homogenized in homogenization buffer (10% w/v, 0.32 M sucrose, 1 mM EDTA, 0.1 mM phenylmethylsulfonyl fluoride (PMSF), 0.01% (w/v) NaN3, pH 7.4, 4 C.) at 600 rpm in a glass homogenizer. The homogenate is centrifuged (1000xg, 4 C., 10 min) and the supernatant is removed. The pellet is resuspended (20% w/v) and the suspension is centrifuged (1000xg, 4 C., 10 min). The two supernatants are combined and centrifuged (15 000xg, 4 C., 30 min). The pellet obtained in this way is referred to as the P2 fraction.The P2 pellet is washed with binding buffer (50 mM Tris-HCl, 1 mM MgCl2, 120 mM NaCl, 5 mM KCl, 2 mM CaCl2, pH 7.4), and centrifuged (15 000x g, 4 C., 30 min), twice.The P2 membranes are resuspended in binding buffer and incubated in a volume of 250 ul (amount of membrane protein 0.1-0.5 mg).
Agonist activity at human alpha7 nAChR expressed in xenopus oocytes assessed as induction of PAM-sensitive desensitization at 30 uM by two-electrode voltage clamp electrophysiology relative to acetylcholine
Agonist activity at human alpha7 nAChR expressed in xenopus oocytes assessed as potentiation of PNU-120596-induced PAM-sensitive desensitization at 30 uM by two-electrode voltage clamp electrophysiology relative to acetylcholine
Partial agonist activity at human alpha7 nAChR expressed in xenopus oocytes assessed as potentiation of PNU-120596-induced PAM-sensitive desensitization at 30 uM by two-electrode voltage clamp electrophysiology relative to acetylcholine
Partial agonist activity at human alpha7 nAChR expressed in xenopus oocytes assessed as induction of PAM-sensitive desensitization at 30 uM by two-electrode voltage clamp electrophysiology relative to acetylcholine
Partial agonist activity at human alpha7 nAChR expressed in xenopus oocytes assessed as induction of PAM-sensitive desensitization by measuring ratio of peak current to net charge at 30 uM by two-electrode voltage clamp electrophysiology relative to acetylcholine
Agonist activity at human alpha7 nACh receptor expressed in rat GH4C1 cells assessed as increase in current amplitudes after 2 to 3 days by patch clamp assay
Agonist activity at human alpha7 nACh receptor expressed in rat GH4C1 cells assessed as increase in current amplitudes at 0.1 to 100 uM after 2 to 3 days by patch clamp assay
Agonist activity at human alpha7 receptor expressed in mouse Neuro2a cells assessed as induction of intracellular calcium level preincubated with PNU-120596 for 20 mins followed by compound addition measured every 2 sec for 3 mins by fluorescence microplate reader analysis
Antagonist activity at human alpha7 receptor expressed in mouse Neuro2a cells assessed as inhibition of acetylcholine iodide-induced intracellular calcium level at 300 uM preincubated with PNU-120596 for 20 mins followed by acetylcholine iodide addition along with compound treatment measured every 2 sec for 3 mins by fluorescence microplate reader analysis
Agonist activity at human alpha7 receptor expressed in mouse Neuro2a cells assessed as induction of intracellular calcium level measured every 2 sec for 3 mins by fluorescence microplate reader analysis in presence of 2 uM alpha7 receptor antagonist alpha-cobratoxin
Antagonist activity at human alpha7 receptor expressed in mouse Neuro2a cells assessed as inhibition of acetylcholine iodide-induced intracellular calcium level at 50 uM preincubated with PNU-120596 for 20 mins followed by acetylcholine iodide addition along with compound treatment measured every 2 sec for 3 mins by fluorescence microplate reader analysis
Agonist activity at human alpha7 nAChR expressed in xenopus oocytes preincubated for 10 mins followed by acetylcholine addition by patch clamp electrophysiological assay
Binding affinity to human alpha7 nAChR expressed in xenopus oocytes preincubated for 10 mins followed by acetylcholine addition by patch clamp electrophysiological assay relative to acetylcholine