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Characteristic and Localization of the Monitor Peptide Receptor

R Yamanishi1, J Kotera1, T Fushiki1

  • 1a Laboratory of Nutritonal Chemistry, Department of Food Science and Technology, Faculty of Agriculture , Kyoto University , Kyoto 606 , Japan.

Bioscience, Biotechnology, and Biochemistry
|June 10, 2016
PubMed

Insights

Researchers identified the monitor peptide receptor on rat small intestinal cells. This receptor is located on cholecystokinin-producing cells, suggesting a role in gastrointestinal signaling.

Area of Science:

  • Gastroenterology
  • Molecular Biology
  • Biochemistry

Background:

  • The monitor peptide receptor's location and function in the small intestine are not fully understood.
  • Identifying specific receptors is crucial for understanding cellular communication and signaling pathways.

Purpose of the Study:

  • To investigate the presence and characteristics of the monitor peptide receptor in the rat small intestine.
  • To determine the cellular localization of the monitor peptide receptor.

Main Methods:

  • Used (125)I labeled monitor peptide to study binding to dispersed rat small intestinal cells.
  • Employed p-toluensulfonyl-L-lysine chloromethyl ketone (TLCK) and soybean trypsin inhibitor (SBTI) to assess receptor specificity.
  • Utilized SDS electrophoresis-autoradiography to analyze cross-linked complexes.
  • Conducted histochemical studies on rat upper intestine tissue sections.

Main Results:

  • Specific binding of labeled monitor peptide was inhibited by TLCK but not by SBTI.
  • TLCK treatment abolished the affinity-cross-linked complex, while SBTI had no effect.
  • Histochemical analysis revealed predominant binding on cholecystokinin (CCK)-immunoreactive cells.

Conclusions:

  • The monitor peptide receptor is located on the surface of intestinal mucosal cells.
  • The receptor is specifically associated with cholecystokinin (CCK)-producing cells in the rat upper intestine.
  • These findings suggest the monitor peptide receptor plays a role in CCK-mediated signaling within the gastrointestinal tract.

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