PMID: 8923569Oct 1, 1996

Pharmacological and neurochemical differences between acute and tardive vacuous chewing movements induced by haloperidol

Psychopharmacology
M F EganT M Hyde

Abstract

Late onset vacuous chewing movements (VCMs) from chronic neuroleptic treatment have been used as a rat model of tardive dyskinesia (TD). Early onset VCMs have also been observed, raising questions about the validity of this model. To assess the relationship between these two types of VCMs, pharmacological and neurochemical properties of early and late onset VCMs were compared. "Acute" VCMs were induced by daily intraperitoneal injections for 1-21 days. "Tardive" VCMs were induced by intramuscular injections of haloperidol decanoate every 3 weeks for 30 weeks followed by a 24-week withdrawal period. Suppression was attempted for both types of VCMs using several doses of intraperitoneal haloperidol. Striatonigral activation was assessed by measuring mRNA expression levels of the neuropeptides dynorphin and substance P using in situ hybridization histochemistry. Enkephalin mRNA was also measured as an index of striatopallidal activation. The results indicate that acute VCMs cannot be suppressed with increased doses of haloperidol and are associated with reduced dynorphin and substance P. This profile is similar to that seen with an animal model of parkinsonism. Tardive VCMs, in contrast, were markedly suppressed by haloperidol. Th...Continue Reading

Citations

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Related Concepts

Behavior, Animal
Lentiform Nucleus Structure
Dynorphin (1-17)
Dyskinesia, Medication-Induced
Enkephalins
Haldol
Chewing
Nucleus Accumbens
Poly(A) Tail
Hypothalamic Substance P

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