Abstract
Following eight monthly haloperidol decanoate injections rats showed an increased rate of vacuous chewing movements (VCM's), which gradually disappeared within 4 drug-free months. Another single dose of non-decanoate haloperidol reinstated a second increase in VCM rate which was still significant after 2 months. The glutamic acid decarboxylase (GAD) activity in the substantia nigra of these chronically haloperidol-treated rats was lower than untreated controls. Furthermore, there was a significant negative correlation between individual VCM rates and nigral GAD activity. No corresponding changes occurred in other brain regions. The depression of nigral GAD may reflect a reduced tissue density of GABA-ergic axon terminals within the descending striato-nigral pathway.
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Gunne, L.M., Häggström, JE. Reduction of nigral glutamic acid decarboxylase in rats with neuroleptic-induced oral dyskinesia. Psychopharmacology 81, 191–194 (1983). https://doi.org/10.1007/BF00427260
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DOI: https://doi.org/10.1007/BF00427260