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Hoffmann, R. A wiki for the life sciences where authorship matters. Nature Genetics (2008)

5-Hydroxytryptamine1A receptor occupancy by novel full antagonist 2-[4-[4-(7-chloro-2,3-dihydro-1,4-benzdioxyn-5-yl)-1-piperazinyl]butyl]-1,2-benzisothiazol-3-(2H)-one-1,1-dioxide: a[11C][O-methyl-3H]-N-(2-(4-(2-methoxyphenyl)-1-piperazinyl)ethyl)-N-(2-pyridinyl)cyclohexanecarboxamide trihydrochloride (WAY-100635) positron emission tomography study in humans.

5-Hydroxytryptamine(1A) (5-HT(1A)) receptors have been implicated in the pathophysiology and treatment of anxiety and depression, and are a target for novel drug development. This is the first study examining the human brain in vivo occupancy by a novel, selective, silent 5-HT(1A) antagonist. 2-[4-[4-(7-Chloro-2,3-dihydro-1,4-benzdioxyn-5-yl)-1-piperazinyl]butyl]-1,2-benzisothiazol-3-(2H)-one-1,1-dioxide (DU 125530), a compound in clinical development, has potential applications in the treatment of anxiety and mood disorders. Positron emission tomography (PET) and [(11)C][O-methyl-3H]-N-(2-(4-(2-methoxyphenyl)-1-piperazinyl)ethyl)-N-(2-pyridinyl)cyclohexanecarboxamide trihydrochloride (WAY-100635), were used to assess 5-HT(1A) autoreceptor and postsynaptic receptor occupancy in 12 healthy male volunteers. Over a 10- to 40-mg daily dose range, DU 125530 was well tolerated, and exhibited a dose-dependent occupancy from 0 to 72% at 2 h post the last dose. Occupancy correlated significantly with plasma levels of DU 125530, and a fitting of the data to a standard single-site binding model gave a maximum occupancy of approximately 80%, and a half-saturation concentration (ED(50)) of approximately 7 ng/ml. At 24 h after the last dose 5-HT(1A) occupancy was approximately 50% of that achieved at 2 h. This study demonstrates that high occupancy of the human brain 5-HT(1A) receptor can be achieved at doses producing minimal acute side effects.[1]


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