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Vol. 300, Issue 3, 831-837, March 2002
Yerkes Regional Primate Research Center (P.W.C., B.C.G., L.L.H.),
Department of Psychiatry and Behavioral Sciences (L.L.H.), and
Department of Pharmacology (L.L.H.), Emory University, Atlanta, Georgia
Preclinical studies have documented that serotonin (5-HT) can modulate
the behavioral effects of cocaine. The present study examined the
ability of 5-HT to attenuate the reinforcing and neurochemical effects
of cocaine in nonhuman primates. In squirrel monkeys trained to
self-administer cocaine (0.1 and 0.3 mg/injection) under a second-order
schedule of i.v. drug delivery, the 5-HT uptake inhibitor alaproclate
(3.0 and 10.0 mg/kg) and the 5-HT direct agonist quipazine (0.3-1.0
mg/kg) decreased response rates at doses that had no significant effect
on behavior maintained by an identical schedule of stimulus
termination. The neurochemical bases of the observed drug interactions
on behavior were investigated further using in vivo microdialysis
techniques in a separate group of awake monkeys to monitor drug-induced
changes in extracellular dopamine (DA). Cocaine (1.0 mg/kg) elevated
the concentration of DA in the caudate nucleus to approximately
300% of basal levels. Pretreatment with alaproclate or quipazine
attenuated cocaine-induced increases in extracellular DA at the same
pretreatment doses that decreased cocaine self-administration. The
results obtained suggest that increasing brain 5-HT activity can
attenuate the reinforcing effects of cocaine, ostensibly by decreasing
the ability of cocaine to elevate extracellular DA in brain areas that
mediate the behavioral effects. These findings extend those reported
previously for the behavioral-stimulant effects of cocaine and identify
a potential neurochemical mechanism underlying drug interactions on behavior.
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