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Altered Structural Expression and Enzymatic Activity Parameters in Quiescent Ulcerative Colitis: Are These Potential

Sebastian Kjærgaard1, Morten M B Damm1, Joan Chang2

  • 1Digestive Disease Center, Bispebjerg Hospital, 2400 Copenhagen, Denmark.

International Journal of Molecular Sciences
|March 14, 2020
PubMed
Summary
This summary is machine-generated.

Even in remission, ulcerative colitis (UC) patients show molecular and functional gut barrier defects. These findings suggest current remission standards may need revision to include mucosal healing markers.

Keywords:
COX-1COX-2Inflammatory bowel diseasePGE2mucosal barrier integritymucosal healingshort-circuit currenttight junctionulcerative colitis

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Area of Science:

  • Gastroenterology
  • Molecular Biology
  • Immunology

Background:

  • Endoscopic mucosal healing is the standard for ulcerative colitis (UC) remission.
  • Histologic normalization may better predict relapse risk in UC.
  • Molecular and functional aspects of mucosal healing in quiescent UC require further investigation.

Purpose of the Study:

  • To investigate molecular and functional mucosal healing in quiescent UC patients.
  • To compare UC patients with healthy controls at the molecular level.
  • To assess the correlation between molecular changes and functional barrier properties.

Main Methods:

  • Endoscopic biopsies from 33 quiescent UC patients and 17 controls.
  • Assessment of histology (Geboes score), protein, and mRNA levels of tight junction proteins and cyclo-oxygenase enzymes.
  • Functional assessment of mucosal ion transport using Ussing chambers and short-circuit current (SCC) measurements.

Main Results:

  • UC patients exhibited chronic inflammation despite endoscopic remission.
  • Reduced claudin-4 protein and upregulated claudin-2/claudin-4 mRNA levels were observed in UC patients.
  • COX-2 inhibition caused a greater decrease in SCC in UC patients, indicating altered functional barrier properties.

Conclusions:

  • Quiescent UC patients display molecular and functional abnormalities in their mucosal barrier.
  • Current remission standards for UC may not fully capture mucosal healing.
  • Further research into molecular signatures is recommended for refining UC remission criteria.