RS-127445 is a potent, selective and high affinity serotonin 5-HT2B receptor antagonist with a pIC50 of 10.4. The affinity (pKi) of RS-127445 for the 5-HT2B receptor is 9.5. RS-127445 is selective for the 5-HT2B receptor, having approximately 1000 fold selectivity over the human recombinant 5-HT2A, 5-HT2C, 5-HT5, 5-HT6 and 5-HT7 receptors, a 5-HT1A receptor in rat brain membranes, a 5-HT1B/D receptor in bovine caudate, and a monoamine uptake site in rabbit platelets. In the HEK-293 cells expressing the 5-HT2B receptor, RS-127445 potently antagonizes 5-HT-evoked formation of inositol phosphates (pKB=9.5±0.1) and 5-HT-evoked increases in intracellular calcium (pIC50=10.4±0.1). In addition, RS-127445 also blocks 5-HT-evoked contraction of rat isolated stomach fundus and (±) α-methyl-5-HT-mediated relaxation of the rat jugular vein with pA2 values of 9.5 and 9.9. In vivo, intraperitoneal administration of RS-127445 (5mg/kg) produces plasma concentrations predicted to fully saturate accessible 5-HT2B receptors for at least 4h. RS-127445 (0.1–10 µM) concentration-dependently reduces peristaltic frequency. RS-127445 (1–30 mg/kg), dose-dependently reduced faecal output, reaching significance at 10 and 30 mg/kg.
| Cell Experiment | |
|---|---|
| Cell lines | HEK-293 cells expressing the human 5-HT2B receptor |
| Preparation method | Pre-incubating RS-127445, vehicle or other antagonists with 240 μl of HEK-293 cells expressing the human 5-HT2B receptor suspension at 37 °C for 20 min. Incubating HEK-293 cells with[3H]-myoinositol (1.67 μCi/ml) in 162 cm2 flasks overnight at 37 °C in an inositol free Ham's F12 medium which contains 10% dialyzed foetal bovine serum. The cells are harvested, washed five times with phosphate bufffered saline and resuspended in inositol free Ham's F12 media at density of approximately 3×103 cells/ml. The reactions are initiated by addition of 5-HT. After sixty minutes , terminating the reactions by adding 50 μl of ice-cold 20% perchloric acid, chilled in an ice-water bath for 10 min and then neutralized with 160μl of 1 N KOH. Each sample is diluted with 2 ml of 50 mM Tris-HCl, pH 7.4 at room temperature. The aqueous portion (2.2 ml) is transferred onto Dowex AG1X8 columns (1 ml, 1 : 1, w/v) which has been washed with 5 ml of distilled water. Then washing the columns with 18 ml of distilled water and eluting the inositol phosphates with 3 ml of 1 N HCl.Using a Packard 1900CA analyzer to determine the eluted radioactivity by liquid scintillation spectroscopy. |
| Concentrations | 10 μM |
| Incubation time | 20 min |
| Animal Experiment | |
|---|---|
| Animal models | rats |
| Formulation | ethanol:pro-pylene glycol : water (10 : 50 : 40, v/v/v) |
| Dosages | 5 mg/kg |
| Administration | Oral for 2.5 h ,intraperitoneal and intravenousroutes for 0.08 h |
| Molecular Weight | 281.33 |
| Formula | C17H16FN3 |
| CAS Number | 199864-87-3 |
| Solubility (25°C) | DMSO 50 mg/mL |
| Storage |
Powder -20°C 3 years ; 4°C 2 years In solvent -80°C 6 months ; -20°C 1 month |
| Species | Mouse | Rat | Rabbit | Guinea pig | Hamster | Dog |
| Weight (kg) | 0.02 | 0.15 | 1.8 | 0.4 | 0.08 | 10 |
| Body Surface Area (m2) | 0.007 | 0.025 | 0.15 | 0.05 | 0.02 | 0.5 |
| Km factor | 3 | 6 | 12 | 8 | 5 | 20 |
| Animal A (mg/kg) = Animal B (mg/kg) multiplied by | Animal B Km |
| Animal A Km |
For example, to modify the dose of Compound A used for a mouse (20 mg/kg) to a dose based on the BSA for a rat, multiply 20 mg/kg by the Km factor for a mouse and then divide by the Km factor for a rat. This calculation results in a rat equivalent dose for Compound A of 10 mg/kg.
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