Cholecystokinin coexists with dopamine in mesolimbic neurons in mammalian brain. When injected directly into the nucleus accumbens, cholecystokinin (CCK) potentiated dopamine (DA)-induced hyperlocomotion and apomorphine-induced stereotypy. These effects were not mimicked by nonsulfated CCK, but were blocked by proglumide, a putative CCK antagonist, as well as by antisera raised against sulfated CCK. CCK alone had no effect on locomotion or sterotypy, indicating that this peptide acts primarily as a modulator of DA-mediated behaviors in the mesolimbic pathway. In addition, CCK did not potentiate DA-induced hyperlocomotion or apomorphine-induced stereotypy when injected into the caudate nucleus, where CCK and DA are localized in separate neurons in rats. Facilitation of DA-mediated behaviors by CCK may represent a functional interaction specific to the neuromodulator-neurotransmitter coexistence phenomenon.
Cholecystokinin potentiates dopamine-mediated behaviors: evidence for modulation specific to a site of coexistence
J. Crawley,J. Stivers,L. Blumstein,S. Paul
Published 1985 in Journal of Neuroscience
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- Publication year
1985
- Venue
Journal of Neuroscience
- Publication date
1985-08-01
- Fields of study
Medicine, Chemistry, Psychology
- Identifiers
- External record
- Source metadata
Semantic Scholar, PubMed
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