Peptide hormone and neuropeptide
Cholecystokinin
Cholecystokinin is a peptide signal studied in digestive regulation and neuronal communication. In research models, responses depend on the receptor and molecular form examined; an observation with CCK-8 does not automatically describe every variant.
This is a research reference, not a product offered in the Asciende catalog. Published studies do not establish the identity, purity or availability of a commercial preparation.
Local signaling and experimental context
Record where and how the measurement was made. Presence of a peptide in a system does not establish that a commercial preparation reproduces that system.
- Does the work study an isolated molecule, endogenous secretion or a preparation containing several components?
- Are tissue, species and response measurement specified?
- Does the interpretation distinguish signal detection from demonstration of its function in that model?
Mechanism described in the literature
In vitro studies with rat pancreatic acini found that CCK-8 activated pathways involving phospholipase C and PYK2 kinase. In mice, the acute feeding response to CCK depended on the CCK-A receptor.
Other names in the literature
- CCK
- Cholecystokinin
Immediate satiety and body weight are different outcomes
An experiment compared mice lacking CCK-A receptors with controls and animals lacking CCK-B receptors. CCK lost its acute effect on intake in the first group, but both modified groups maintained normal body weight during follow-up. The finding distinguishes an immediate response from long-term weight regulation (PMID 9927499).
What the pancreatic model adds
The rat acinar study examined phosphorylation, enzyme activity and protein associations. PYK2 and another related kinase responded differently to experimental blockades, allowing signaling branches to be separated. Measuring only one protein would have hidden part of this organization (PMID 10531323).
Identify the material before comparing studies
CCK denotes the peptide system; CCK-8 identifies the specific material used in the cited pancreatic experiment. Comparisons also need the deleted receptor, tissue and measured variable. A cellular signaling assay does not measure meal size, and an intake record alone does not reveal which kinases participated.
Questions and answers
Does the satiety study demonstrate a sustained weight change?
No. In that mouse model, the acute CCK response and weight follow-up provided different information.
Are CCK and CCK-8 interchangeable names?
CCK-8 specifies a particular form. Keep that designation when it identifies the material studied.
Sources
- The cholecystokinin-A receptor mediates inhibition of food intake yet is not essential for the maintenance of body weight. — J Clin Invest, 1999
- The cholecystokinin-A receptor mediates inhibition of food intake yet is not essential for the maintenance of body weight.
- Cholecystokinin activates PYK2/CAKbeta by a phospholipase C-dependent mechanism and its association with the mitogen-activated protein kinase signaling pathway in pancreatic acinar cells. — J Biol Chem, 1999
- Cholecystokinin activates PYK2/CAKbeta by a phospholipase C-dependent mechanism and its association with the mitogen-activated protein kinase signaling pathway in pancreatic acinar cells.