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Cholecystokinin-like bioactivity in rat cerebral cortex
Scandinavian Journal of Gastroenterology
|January 1, 1981
Summary
Researchers found cholecystokinin (CCK)-like bioactivity in rat brain cortex using multiple bioassays. This suggests CCK may play a role in neuronal transmission within the brain.
Area of Science:
- Neuroscience
- Biochemistry
Background:
- Cholecystokinin (CCK) is a peptide hormone with known functions in digestion and satiety.
- CCK-like immunoreactivity has been previously detected in the mammalian brain, particularly the cerebral cortex.
Purpose of the Study:
- To investigate the presence and localization of CCK-like bioactivity in rat cerebral cortex extracts.
- To explore the potential role of CCK in neuronal transmission.
Main Methods:
- Utilized three distinct bioassays to measure CCK-like bioactivity in rat cerebral cortex extracts.
- Analyzed various subcellular fractions, including synaptic membranes, vesicles, and fragments.
Main Results:
- Consistent positive results for CCK-like bioactivity were observed across all three bioassays.
- A significant amount of CCK-like activity was localized within synaptic structures.
- Quantitative correlation was found between two of the bioassay methods.
Conclusions:
- The study provides strong evidence for the existence of bioactive CCK molecular forms in the rat brain cortex.
- The concentration of CCK within synaptic elements suggests a potential role in synaptic transmission.
- Findings support the hypothesis of CCK acting as a neurochemical messenger.