ELECTROPHYSIOLOGICAL, BIOCHEMICAL AND BEHAVIORAL EVIDENCE FOR 5-HT(2)AND 5-HT(3) MEDIATED CONTROL OF DOPAMINERGIC FUNCTION

Several lines of evidence have suggested a link between serotonergic a nd dopaminergic systems in the brain. The interpretation of much of th ese early data needs careful reevaluation in light of the recent under standing of the plethora of serotonin receptor subtypes, their distrib ution in the brain and the new findings with more selective serotonin antagonists. Electrophysiological, biochemical and behavioral evidence obtained using highly selective antagonists of the 5-HT2 or 5-HT3 rec eptor subtypes, MDL 100,907 or MDL 73,147EF, respectively, supports th e thesis that serotonin modulates the dopaminergic system. This modula tion is most evident when the dopaminergic system has been activated.