Abstract |
N-(2,5-Dibromo-3-fluorophenyl)-4-methoxy-3-piperazin-1-ylbenzenesulfonamide (SB-357134) potently inhibited [125I]SB-258585 and [3H]LSD binding in a HeLa cell line expressing human 5-HT(6) receptors (pK(i)=8.6 and 8.54, respectively). Furthermore, SB-357134 inhibited [125I]SB-258585 binding in human caudate--putamen and in rat and pig striatum membranes (pK(i)=8.82, 8.44, and 8.61, respectively). SB-357134 displayed over 200-fold selectivity for the 5-HT(6) receptor versus 72 other receptors and enzymes. 5-HT-stimulated cyclic AMP (cAMP) accumulation in human 5-HT(6) receptors was competitively antagonised by SB-357134 (pA(2)=7.63). SB-357134 inhibited ex vivo [125I]SB-258585 binding in the rat with an ED(50) of 4.9 +/- 1.3 mg/kg po, 4 h postdose. In the rat maximal electroshock seizure threshold (MEST) test, SB-357134 produced a potent and dose-dependent increase in seizure threshold, with a minimum effective dose of 0.1 mg/kg po. At 10 mg/kg po, maximum activity occurred between 4 and 6 h postdose. Good exposure was observed with SB-357134 at 10 mg/kg po, reaching maximal blood and brain concentrations of 4.3 +/- 0.2 and 1.3 +/- 0.06 microM, respectively, 1 h postdose. In addition, SB-357134 (10 mg/kg po) enhanced memory and learning following chronic administration (twice a day for 7 days) in the rat water maze. Overall, these studies demonstrate that SB-357134 is a potent, selective, brain penetrant, and orally active 5-HT(6) receptor antagonist.
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Authors | Tania O Stean, Warren D Hirst, David R Thomas, Gary W Price, Derek Rogers, Graham Riley, Steven M Bromidge, Halina T Serafinowska, Douglas R Smith, Sarah Bartlett, Nigel Deeks, Mark Duxon, Neil Upton |
Journal | Pharmacology, biochemistry, and behavior
(Pharmacol Biochem Behav)
Vol. 71
Issue 4
Pg. 645-54
(Apr 2002)
ISSN: 0091-3057 [Print] United States |
PMID | 11888556
(Publication Type: Journal Article)
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Chemical References |
- N-(2,5-dibromo-3-fluorophenyl)-4-methoxy-3-piperazin-1-ylbenzenesulfonamide
- Piperazines
- Receptors, Serotonin
- Recombinant Proteins
- Serotonin Antagonists
- Sulfonamides
- serotonin 6 receptor
- Cyclic AMP
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Topics |
- Algorithms
- Animals
- Brain
(metabolism)
- Brain Chemistry
(drug effects)
- Cognition
(drug effects)
- Cyclic AMP
(metabolism)
- Electroshock
- Exploratory Behavior
(drug effects)
- Humans
- Male
- Maze Learning
(drug effects)
- Membranes
(drug effects, metabolism)
- Piperazines
(metabolism, pharmacology)
- Radioligand Assay
- Rats
- Rats, Sprague-Dawley
- Receptors, Serotonin
(drug effects, metabolism)
- Recombinant Proteins
(drug effects)
- Seizures
(prevention & control)
- Serotonin Antagonists
(metabolism, pharmacology)
- Sulfonamides
(metabolism, pharmacology)
- Swine
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