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Caspase-4 activation in association with decreased adenosine deaminase activity may be a factor for gastric ulcer

Takahiro Yaguchi1, Masaru Saito, Yoshiyuki Yasuda

  • 1Division of Bioinformation, Department of Physiology, Hyogo College of Medicine, Nishinomiya, Japan.

Digestion
|December 24, 2009
PubMed
Abstract

Insights

Reduced adenosine deaminase (ADA) activity in the stomach may cause gastric ulcers by increasing adenosine levels, leading to cell apoptosis via caspase-4 and caspase-3 activation. This reveals a novel pathway for gastric ulcer pathogenesis.

Area of Science:

  • Biochemistry
  • Immunology
  • Gastroenterology

Background:

  • Adenosine deaminase (ADA)-deficient disease, a form of severe combined immunodeficiency, is linked to gastrointestinal issues like ulcers.
  • The specific role of ADA in the development of gastric ulcers requires further investigation.

Purpose of the Study:

  • To explore the involvement of ADA in the pathogenesis of gastric ulcers.
  • To investigate the correlation between ADA activity, adenosine levels, and gastric epithelial cell apoptosis.

Main Methods:

  • Measured ADA activity in rat tissues and human gastric biopsy samples.
  • Utilized MTT assay, TUNEL staining, and enzymatic assays for caspase-3 and -4 in MKN45 cells.
  • Performed Western blot analysis to detect caspase-4 activation in gastric biopsies.

Main Results:

  • Gastrointestinal epithelium showed higher ADA activity in rats.
  • ADA inhibition in MKN45 cells decreased viability and increased apoptosis markers (TUNEL, caspases-3, -4).
  • Gastric ulcer tissues exhibited lower ADA activity and a trend towards caspase-4 activation.

Conclusions:

  • Decreased gastric ADA activity elevates intracellular adenosine, potentially inducing gastric epithelial cell apoptosis.
  • Caspase-4 and caspase-3 activation are implicated in this ADA-related gastric ulcer pathway.
  • This study proposes a novel mechanism linking ADA activity and caspase-4 to gastric ulcer pathogenesis.

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