RGD Reference Report - Cholecystokinin cells purified by fluorescence-activated cell sorting respond to monitor peptide with an increase in intracellular calcium. - Rat Genome Database

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Cholecystokinin cells purified by fluorescence-activated cell sorting respond to monitor peptide with an increase in intracellular calcium.

Authors: Liddle, RA  Misukonis, MA  Pacy, L  Balber, AE 
Citation: Liddle RA, etal., Proc Natl Acad Sci U S A. 1992 Jun 1;89(11):5147-51.
RGD ID: 10044258
Pubmed: PMID:1594624   (View Abstract at PubMed)
PMCID: PMC49246   (View Article at PubMed Central)

Cholecystokinin (CCK) is secreted from specific enteroendocrine cells of the upper small intestine upon ingestion of a meal. In addition to nutrients, endogenously produced factors appear to act within the gut lumen to stimulate CCK release. One such factor is a trypsin-sensitive CCK-releasing peptide found in pancreatic juice, known as monitor peptide. This peptide is active within the intestinal lumen and is hypothesized to stimulate CCK secretion by interacting directly with the CCK cell. We have found that monitor peptide releases CCK from isolated rat intestinal mucosal cells and that this effect is dependent upon extracellular calcium. In the present study, we used monitor peptide as a tool for isolating CCK cells from a population of small intestinal mucosal cells. Dispersed rat intestinal mucosal cells were loaded with the calcium-sensitive fluorochrome Indo-1, and CCK secretory cells were identified spectrofluorometrically by their change in fluorescence when stimulated with monitor peptide. Cells demonstrating a change in their emission fluorescence ratio were sorted using a fluorescence-activated cell sorter. More than 90% of the sorted cells stained positively for CCK with immunohistochemical staining. Furthermore, sorted cells secreted CCK when stimulated with membrane-depolarizing concentrations of potassium chloride, dibutyryl cAMP, calcium ionophore, and monitor peptide. These findings indicate that functional intestinal CCK cells can be highly enriched using fluorescence-activated cell sorting. Furthermore, monitor peptide appears to interact directly with CCK cells to signal CCK release through an increase in intracellular calcium.

Gene Ontology Annotations    Click to see Annotation Detail View

Biological Process
TermQualifierEvidenceWithReferenceNotesSourceOriginal Reference(s)
positive regulation of cytosolic calcium ion concentration  IDA 10044258 RGD 

Objects Annotated

Genes (Rattus norvegicus)
Spink1  (serine peptidase inhibitor, Kazal type 1)


Additional Information