Abstract
BINDING studies performed in vitro with 3H-haloperidol1–3, 3H-spiperone4–5, 3H-dopamine1–3,6 and 3H-apomorphine7,8 showed that the specific neuroleptic binding sites in the striatum are dopaminergic. The frontal cortex, however, was much more labelled by 3H-spiperone than by 3H-haloperidol9,10. The investigations reported here indicate that the neuroleptic receptor sites in the frontal cortex labelled by 3H-spiperone are predominantly serotonergic and virtually identical to those labelled by 3H-LSD. These conclusions were reached from a study of the relative binding affinities of a series of serotonin or dopamine agonists or antagonists for rat frontal cortex and striatal receptors. Significant correlations were obtained between the binding activities in the rat frontal cortex and in vivo potencies in the pharmacological anti-tryptamine test. Similarly, binding activities in the striatum were significantly correlated with the potencies in the anti-apomorphine test. We therefore suggest that serotonergic, as well as dopaminergic, receptors are involved in the mechanism of action of neuroleptic drugs.
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LEYSEN, J., NIEMEGEERS, C., TOLLENAERE, J. et al. Serotonergic component of neuroleptic receptors. Nature 272, 168–171 (1978). https://doi.org/10.1038/272168a0
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DOI: https://doi.org/10.1038/272168a0
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