| In Vitro | In vitro activity: LP-211 is a potent and selective 5-HT7 receptor agonist, with Ki of 0.58 nM, and is 324- and 245-fold more selective over 5-HT1A receptor (Ki, 188 nM) and D2 receptor (Ki, 142 nM). LP-211 shows agonist properties with an EC50 of 0.6 μM.
Kinase Assay: [3H]-labeled LSD was used for the binding assay at rat cloned 5-HT7 receptor. In 1 mL of incubation buffer (50 mM Tris, 10 mM MgCl2 and 0.5 mM EDTA, pH 7.4) are suspended 30 μg of membranes, 2.5 nM [3H]-LSD, LP-211 (6–9 concentrations). The samples are incubated for 60 min at 37°C. The incubation is stopped by rapid filtration on GF/A glass fiber filters (presoaked in 0.5% polyethylenimine for 30 min). The filters are washed with 3 × 53 mL of ice-cold buffer (50 mM Tris, pH 7.4). Nonspecific binding is determined in the presence of 10 μM 5-CT. Approximately 90% of specific binding is determined under these conditions
Cell Assay: |
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| In Vivo | LP-211 (10 mg/kg, i.p.) rapidly reaches the systemic circulation in mice with mean Cmax of 0.76 ± 0.32 μg/mL at 30 min. LP-211 (0.003-0.3 mg/kg, i.p.) significantly increases the micturition volume in a dose-dependent manner, and causes significant increases in voiding efficiency in spinal cord-injured (SCI) rats, and such effects can be completely reversed by SB-269970. LP-211 (0.25 and 0.50 mg/kg i.p.) improves consolidation of chamber-shape memory in rats, resulting in significant novelty-induced hyperactivity and recognition. |
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