Pontine reticular formation is involved in catalepsy produced by cholinergic drugs

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Abstract

Bilateral kainic acid lesions of the ventro-medial (VM) thalamic nucleus of rats which greatly reduced the catalepsy produced by haloperidol (2 mg/kg i.p.) not only did not reduce, but even enhanced, the cataleptogenic effect of eserine (1 mg/kg i.p.) and arecoline (30 mg/kg i.p.). This finding is in accord with former conclusions that catalepsy produced by cholinergic drugs does not depend on striatal mechanisms. In rats with kainic acid lesions of the VM thalamic nucleus, and similarly in intact, non-lesioned rats, systemic administration of eserine and arecoline potentiated the catalepsy produced by microinjections of carbachol (2 μg) into the pontine reticular formation (PRF). Atropine microinjected bilaterally into the PRF attenuated the cataleptogenic effect of eserine and arecoline i.p. We suggest that the PRF is a site at which systemically given cholinergic drugs act to produce catalepsy.

Original languageEnglish
Pages (from-to)166-172
Number of pages7
JournalNaunyn-Schmiedeberg's Archives of Pharmacology
Volume356
Issue number2
DOIs
StatePublished - 1997

Keywords

  • Catalepsy
  • Kainic lesions
  • Pontine reticular formation
  • Rat
  • VM nucleus

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