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Nicotinic cholinergic receptors in human thalamus were measured using (-)3H-nicotine (20 nM) and 3H-acetylcholine (3H-ACh) (20 nM) as radioligands. The specific binding for 3H-nicotine to homogenates of thalamus was 51.6 +/- 8.3 pmol/g protein and for 3H-ACh 18.6 +/- 1.9 pmol/g protein. Receptor autoradiography indicated a high labelling of both 3H-Nicotine and 3H-ACh in the antero-ventral nucleus of thalamus and dorso-medial nucleus of thalamus, while the labelling was lower in the postero-lateral nucleus of thalamus and in the postero-lateral ventral nucleus of thalamus. Quantitative measurement of the 3H-nicotine autoradiograms showed highest labelling in the anteroventral nucleus of thalamus (17.34 +/- 0.76 pmol/g tissue). This study indicates a heterogeneous distribution of high-affinity nicotinic receptors in the human thalamus.
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