Abstract:
:Anticonvulsant mood stabilizers, e.g., valproic acid and carbamazepine, and atypical antipsychotic drugs (APDs), e.g., clozapine, quetiapine, olanzapine, risperidone, and ziprasidone, have been reported to preferentially increase dopamine (DA) release in rat medial prefrontal cortex (mPFC), an effect partially or fully inhibited by WAY100635, a selective 5-HT(1A) antagonist. These atypical APDs have themselves been reported to be effective mood stabilizers, although the importance of increased cortical DA release to mood stabilization has not been established. The purpose of the present study was to determine whether zonisamide, another anticonvulsant mood stabilizer, as well as lithium, a mood stabilizer without anticonvulsant properties, also increases prefrontal cortical DA release and, if so, whether this release is also inhibited by 5-HT(1A) antagonism. As with valproic acid and carbamazepine, zonisamide (12.5 and 25 mg/kg) increased DA release in the mPFC, but not the NAC, an increase abolished by WAY100635 (0.2 mg/kg). However, lithium (100 and 250 mg/kg) decreased DA release in the NAC, an effect also attenuated by WAY100635 (0.2 mg/kg). Lithium itself had no effect in the mPFC but the combination of WAY100635 (0.2 mg/kg) and lithium (100 and 250 mg/kg) markedly increased DA release in the mPFC. Furthermore, M100907 (0.1 mg/kg), a selective 5-HT(2A) antagonist, abolished this increase in DA release in the mPFC. These results indicate that not all mood-stabilizing agents but only those, which have anticonvulsant mood-stabilizing properties, increase DA release in the cortex, and that the effect is dependent upon 5-HT(1A) receptor stimulation. However, the combination of lithium and 5-HT(1A) blockade may result in excessive 5-HT(2A) receptor stimulation, relative to 5-HT(1A) receptor stimulation, both of which can increase prefrontal cortical DA release.
journal_name
Brain Resjournal_title
Brain researchauthors
Ichikawa J,Dai J,Meltzer HYdoi
10.1016/j.brainres.2005.05.005subject
Has Abstractpub_date
2005-07-12 00:00:00pages
182-90issue
2eissn
0006-8993issn
1872-6240pii
S0006-8993(05)00716-Xjournal_volume
1049pub_type
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