Abstract
We have previously demonstrated a marked loss in N- methyl- d-aspartate (NMDA) receptors in the hippocampus and cerebral cortex of patients dying with dementia of the Alzheimer type (DAT). In addition, we have found that the dissociative anesthetic N-(1-[2-thienyl]cyclohexyl)3,4-piperidine ([ 3H]TCP) binds to a site whose regional distribution is highly correlated with that of NMDA receptor sites. We studied the binding of [ 3H]TCP to sections of hippocampi from 8 controls, 12 patients with DAT and 7 patients with other dementias. [ 3H]TCP binding was significantly reduced in strata pyramidalia of CA 1/CA 2, CA 3 and subiculum of DAT hippocampal formation compared to that of control. Labelled dissociative anestheties could potentially be used with positron emission tomography in the diagnosis of DAT.
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