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- W2036699834 abstract "The serotonin receptor 6 (5-HT6) is implicated in the pathophysiology of cognitive diseases, schizophrenia, anxiety and obesity and in vivo studies of this receptor would be of value for studying the pathophysiology of these disorders. Therefore, N-[3,5-dichloro-2-(methoxy)phenyl]-4-(methoxy)-3-(1-piperazinyl)benzenesulfonamide (SB399885), a selective and high affinity (pKi = 9.11) 5-HT6 antagonist, has been radiolabeled with carbon-11 by O-methylation of the corresponding desmethyl analogue with [11C]MeOTf in order to determine the suitability of [11C]SB399885 to quantify 5-HT6R in living brain using PET. Desmethyl-SB399885 was prepared, starting from 1-(2-methoxyphenyl) piperazine hydrochloride, in excellent yield. The yield obtained for radiolabeling of [11C]SB399885 was 30 ± 5% (EOS) and the total synthesis time was 30 min at EOB. PET studies with [11C]SB399885 in baboon showed fast uptake followed by rapid clearance in the brain. Highest uptake of radioactivity of [11C]SB399885 in baboon brain were found in temporal cortex, parahippocampal gyrus, pareital cortex, amygdala, and hippocampus. Poor brain entry and inconsistent brain uptake of [11C]SB399885 compared to known 5-HT6R distribution limits its usefulness for the in vivo quantification of 5-HT6R with PET." @default.
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- W2036699834 date "2011-09-01" @default.
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- W2036699834 title "Synthesis and in vivo evaluation of [O-methyl-11C] N-[3,5-dichloro-2-(methoxy)phenyl]-4-(methoxy)-3-(1-piperazinyl)benzenesulfonamide as an imaging probe for 5-HT6 receptors" @default.
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- W2036699834 doi "https://doi.org/10.1016/j.bmc.2011.06.090" @default.
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