Cholinergic neuronal modulation alters dopamine D2 receptor availability in vivo by regulating receptor affinity induced by facilitated synaptic dopamine turnover: positron emission tomography studies with microdialysis in the conscious monkey brain.

ABSTRACT: To evaluate the cholinergic and dopaminergic neuronal interaction in the striatum, the effects of scopolamine, a muscarinic cholinergic antagonist, on the striatal dopaminergic system were evaluated multi-parametrically in the conscious monkey brain using high-resolution positron emission tomography in combination with microdialysis. l-3,4-Dihydroxyphenylalanine (l-[beta-(11)C]DOPA) and 2beta-carbomethoxy-3beta-(4-fluorophenyl)tropane ([beta-(11)C]CFT) were used to measure dopamine synthesis rate and dopamine transporter (DAT) availability, respectively. For assessment of dopamine D(2) receptor binding in vivo, [(11)C]raclopride was applied because this labeled compound, which has relatively low affinity to dopamine D(2) receptors, was hypothesized to be sensitive to the striatal synaptic

SUBMITTER: Tsukada H 

PROVIDER: S-EPMC6772834 | biostudies-literature | 2000 Sep

REPOSITORIES: biostudies-literature