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  • Title: Exquisite delineation of 5-HT1A receptors in human brain with PET and [carbonyl-11 C]WAY-100635.
    Author: Pike VW, McCarron JA, Lammertsma AA, Osman S, Hume SP, Sargent PA, Bench CJ, Cliffe IA, Fletcher A, Grasby PM.
    Journal: Eur J Pharmacol; 1996 Apr 22; 301(1-3):R5-7. PubMed ID: 8773468.
    Abstract:
    The 5-HT1A receptor antagonist, WAY-100635 [N-(2-(4-(2-methoxyphenyl)- 1-piperazinyl)ethyl)-N-(2-pyridyl) cyclohexanecarboxamide], was labelled in its carbonyl group with carbon-11 (t1/2 = 20.4 min), injected intravenously into healthy male volunteers and studied with positron emission tomography (PET). The acquired data provide exquisite delineation of 5-HT1A receptors in brain, with the ratio of radioactivity uptake in receptor-rich regions, such as medial temporal cortex, to that in receptor-devoid cerebellum reaching 25 by 60 min after radioligand injection. Application of biomathematical modelling to the data revealed high values (7.8) for binding potential, a measure of Bmax/Kp, in receptor-rich regions. Only very polar radioactive metabolites were present in plasma, a finding consistent with the low level of nonspecific binding seen in cerebellum. [carbonyl-11C]WAY-100635 is concluded to be far superior to the previously reported [0-methyl-11C]WAY-100635 as a radioligand for PET studies of 5-HT1A receptors in human brain.
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