[3H]N-[1-(2-thienyl)cyclohexyl]-3,4-piperidine ([3H]TCP) binding in human frontal cortex: decreases in Alzheimer-type dementia.

作者: Haruaki Ninomiya , Reiko Fukunaga , Takashi Taniguchi , Motohatsu Fujiwara , Shun Shimohama

DOI: 10.1111/J.1471-4159.1990.TB01903.X

关键词:

摘要: : We studied [3H]N-[1-(2-thienyl)cyclohexyl]-3,4-piperidine ([3H]TCP) binding to human frontal cortex obtained at autopsy from 10 histologically normal controls and eight histopathologically verified cases with Alzheimer-type dementia (ATD). Extensively washed membrane preparations were used minimize the effects of endogenous substances. In ATD cortex, total concentration (Bmax) [3H]TCP sites was significantly reduced by 40–50%. The apparent dissociation constant (KD) values showed no significant change. reduction in capacity also Triton X-100–treated preparations, there a linear correlation between number that N-methyl-D-aspartate (NMDA)-sensitive [3H]glutamate sites. spared brains retained affinity for ligand reactivity NMDA, L-glutamate, glycine. These results suggest primary change NMDA receptor-ion channel complex is its number, possibly reflecting loss neurons bearing these receptor complexes, functional linkage within complexes remains normal.

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