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Vol. 302, Issue 3, 1129-1134, September 2002
Clarke Division, CAMH, Toronto, ON, Canada (S.K.); and Johnson & Johnson Pharmaceutical Research and Development, Division of Janssen
Pharmaceutica, Beerse, Belgium (X.L., P.V., A.A.H.P.M., R.D.C., J.S.A.)
All atypical antipsychotics avoid extrapyramidal side-effects yet
differ in their propensity to cause other side-effects, like prolactin
elevation. We proposed that the atypical antipsychotics with a
propensity for prolactin elevation would show a higher pituitary versus
striatal D2 receptor occupancy. To investigate this hypothesis, we
tested four atypical antipsychotics, two that are commonly associated
with prolactin elevation (amisulpride and risperidone) and two that are
less frequently associated (quetiapine and olanzapine). In particular,
we calculated their ED50 values to increase plasma
prolactin and block peripheral pituitary D2 receptors to their
ED50 values to antagonize apomorphine-induced stereotypy
and occupy central striatal D2 receptors. All antipsychotics dose
dependently increased prolactin levels and antagonized
apomorphine-induced stereotypy. However, the central to peripheral
potency (ED50 for apomorphine antagonism to
ED50 for prolactin elevation) differed remarkably across
these drugs: amisulpride (21764), risperidone (14), quetiapine (10),
and olanzapine (1.7). Compounds displaying a higher peripheral potency
brought about higher prolactin levels for a given level of functional
central antagonism. This dissociation between central and peripheral
effects was explained by the differential occupancy of D2 receptors in
the striatum versus in the pituitary [ratio of striatal/pituitary
ED50 values (milligram per kilogram) for D2 occupancy):
amisulpride (17/0.026 = 654), risperidone (0.89/0.081 = 14),
quetiapine (24/4.1 = 6), olanzapine (0.30/0.43 = 0.7). These
results indicate that dissociation between central and peripheral D2
receptor occupancy is a major determinant of the degree of prolactin
elevation observed at therapeutic doses.
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