NPS, at low picomolar concentrations, can selectively inhibit the evoked release of 5-HT and noradrenaline in the frontal cortex by acting directly on 5-hydroxytryptaminergic and noradrenergic nerve terminals. These direct effects may explain only in part the unique behavioural activities of NPS, while an indirect involvement of other transmitters, especially of glutamate, must be considered.
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Raiteri et al. (2009) studied this question.
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