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  • Title: Uptake and regional distribution of (+)-(R)- and (-)-(S)-N-[methyl-11C]-nicotine in the brains of rhesus monkey. An attempt to study nicotinic receptors in vivo.
    Author: Nordberg A, Hartvig P, Lundqvist H, Antoni G, Ulin J, Långström B.
    Journal: J Neural Transm Park Dis Dement Sect; 1989; 1(3):195-205. PubMed ID: 2789067.
    Abstract:
    N-[methyl-11C] nicotine (11C-nicotine) was given intravenously to monkeys and the uptake and regional distribution of radioactivity was followed in the brain using positron emission tomography (PET). The 11C-radioactivity in the brain peaked within 1-2 min and then rapidly declined. Pretreatment with unlabelled nicotine (10 micrograms/kg) reduced the uptake of 11C-radioactivity to the brain by 30%. The uptake of radioactivity was higher following (+)11C-nicotine than (-)11C-nicotine. Both enantiomers were distributed in a similar manner within the brain. When animals were infused with a peripheral nicotinic blocker (trimetaphan) the uptake of radioactivity to the brain was lower following (+)11C-nicotine compared to (-)11C-nicotine. The amount of radioactivity was high in the occipital cortex, thalamus, intermediate in the frontal cortex and low in white matter in (-)11C injected monkeys while no regional difference in distribution of 11C-radioactivity was observed after injection of (+)11C-nicotine.
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