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Vol. 291, Issue 1, 161-170, October 1999
Lilly Research Laboratories, Eli Lilly and Company, Indianapolis,
Indiana
Previous animal studies have indicated that drugs targeted at
metabotropic glutamate (mGlu) receptors may be useful for
treatment of psychosis. In this article, the effects of the novel,
potent, and selective mGlu2/3 receptor agonists LY354740 and LY379268, and the clinically effective agents clozapine and haloperidol, were
investigated using phencyclidine (PCP; 5 mg/kg)- versus
d-amphetamine (AMP; 3 mg/kg)-evoked motor activities.
LY354740 (1-10 mg/kg s.c.), LY379268 (0.3-3 mg/kg s.c.), clozapine
(1-10 mg/kg s.c.), and haloperidol (0.03-1 mg/kg s.c.) reversed the
increases in ambulations, fine motor (nonambulatory) movements, and
decreased time at rest evoked by PCP. Furthermore, the inhibitions of
the PCP response by the mGlu2/3 agonist LY379268, but not by clozapine,
were completely reversed by the selective mGlu2/3 receptor antagonist
LY341495. Doses of LY354740 and LY379268 that blocked the effects on
PCP had no effects on rotorod performance, and (with the
exception of rearing behavior) had minimal effects on AMP-evoked motor
activities. Clozapine blocked AMP-induced rearing but
enhanced AMP-induced ambulations and fine movements at the lower doses
(1 and 3 mg/kg). Unlike the mGlu2/3 agonists, the highest dose of
clozapine tested (10 mg/kg) impaired animals on the rotorod.
Haloperidol potently blocked all PCP and AMP effects, but only at doses
associated with motor impairment. These data demonstrate that mGlu2/3
receptor agonists act via a unique mechanism to selectively block
PCP-induced behaviors. Moreover, the marked mGlu2/3 receptor-mediated
inhibitions of PCP-evoked behaviors by LY354740 and LY379268, with
minimal effects on AMP, may indicate potential antipsychotic effects in humans in the absence of dopamine mediated extrapyramidal side effects.
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