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Role of CCK in gallbladder function

B T Schjoldager1

  • 1Rigshospitalet, University Hospital of Copenhagen, Denmark.

Annals of the New York Academy of Sciences
|March 23, 1994
PubMed
Summary
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Cholecystokinin (CCK) is a key hormone regulating gallbladder emptying after meals. Its interaction with the CCKA receptor on gallbladder muscle cells is specific and conserved across species, despite biochemical differences.

Area of Science:

  • Gastroenterology
  • Endocrinology
  • Molecular Biology

Background:

  • Cholecystokinin (CCK) is a major hormonal stimulus for gallbladder contraction post-meal.
  • CCK's effects are mediated via CCKA receptors on gallbladder smooth muscle and nerves.
  • The role of CCK in interdigestive motility requires further investigation.

Purpose of the Study:

  • To investigate the interaction of Cholecystokinin (CCK) with the gallbladder smooth muscle CCKA receptor.
  • To characterize the potency, specificity, and affinity of CCK binding to CCKA receptors.
  • To compare the biochemistry of CCKA receptors across different species.

Main Methods:

  • Concentration-dependent contraction assays of gallbladder muscle strips.
  • CCK binding studies to assess affinity and specificity.

Related Experiment Videos

  • Biochemical analysis (size, glycosylation, protein core) of purified CCKA receptors from bovine and human gallbladder.

    • Main Results:

    • CCK induces concentration-dependent gallbladder muscle contraction with nanomolar potency.
    • CCK binding to CCKA receptors shows high affinity and specificity, 1000-fold greater than gastrin.
    • CCKA receptor biochemistry differs between species (glycosylation, size), but the conserved protein core suggests a preserved binding region.

    Conclusions:

    • CCK and its gallbladder muscularis CCKA receptor are primary regulators of postprandial gallbladder emptying.
    • CCKA receptor binding characteristics are conserved across species, independent of age, gender, weight, or pathology.
    • Species-specific glycosylation of CCKA receptors does not impede CCK binding efficacy.