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Imidazoline recognition sites and stomach function.

G J Molderings1, M Burian, S Menzel

  • 1Institute of Pharmacology and Toxicology, University of Bonn, Germany. molderings@ibm.rhrz.uni-bonn.de

Annals of the New York Academy of Sciences
|July 23, 1999
PubMed
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Researchers identified novel imidazoline and sigma binding sites in the stomach, unrelated to muscle contraction or acid release. Helicobacter pylori infection increases agmatine levels in human gastric juice.

Area of Science:

  • Pharmacology
  • Gastroenterology
  • Neuroscience

Background:

  • The stomach possesses various receptors, including imidazoline and sigma binding sites.
  • The role of these non-adrenoceptor sites in gastric function is not fully understood.
  • Helicobacter pylori infection is a common cause of gastric issues.

Purpose of the Study:

  • To characterize novel [3H]clonidine, [3H]idazoxan, and [3H]DTG binding sites in rat and human stomach membranes.
  • To investigate the functional relevance of these binding sites in gastric smooth muscle contraction and acid release.
  • To explore the potential role of Helicobacter pylori and its product agmatine in the gastric environment.

Main Methods:

  • Radioligand binding assays using [3H]clonidine, [3H]idazoxan, and [3H]DTG on rat and human gastric membranes.

Related Experiment Videos

  • Inhibition studies with various ligands to determine binding site characteristics.
  • Functional assays assessing gastric smooth muscle contractility and acid secretion.
  • Measurement of agmatine levels in human gastric juice from H. pylori-positive and negative patients.

    • Main Results:

    • Identified non-adrenoceptor [3H]clonidine and [3H]idazoxan binding sites, and [3H]DTG binding sites in gastric membranes.
    • Characterized these sites as non-I1/non-I2 [3H]clonidine binding sites, I2-imidazoline binding sites, and sigma 2-like sites in rat stomach.
    • These sites showed no direct correlation with gastric smooth muscle contraction or acid release.
    • Demonstrated that Helicobacter pylori produces and releases agmatine, with higher concentrations found in gastric juice of infected patients.

    Conclusions:

    • The stomach harbors distinct imidazoline and sigma binding sites with unique pharmacological profiles.
    • These gastric binding sites do not appear to mediate contractile responses or acid secretion.
    • Helicobacter pylori infection is associated with increased endogenous agmatine levels in the human stomach.