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Studies on purine enzymes in experimental colitis
1Department of Biochemistry, Faculty of Medicine, Health Sciences Center, Kuwait University, Safat.
Molecular and Cellular Biochemistry
|July 3, 1999
Summary
This study reveals an inverse relationship between inflammation and purine deaminases, adenosine deaminase (ADA) and adenylate deaminase (AMP-DA), in blood and intestinal tissues during colitis in rats.
Area of Science:
- Biochemistry
- Gastroenterology
- Immunology
Background:
- The roles of adenosine deaminase (ADA), adenylate deaminase (AMP-DA), and purine nucleoside phosphorylase (PNP) are established in gastrointestinal cancers.
- Their involvement in inflammatory bowel diseases (IBD) remains largely unexplored.
Purpose of the Study:
- To investigate the activity profiles of ADA, AMP-DA, and PNP in blood and intestinal tissues during experimentally induced colitis.
- To explore potential correlations between inflammation markers and purine metabolism enzymes in IBD.
Main Methods:
- Colitis was induced in Wistar rats using acetic acid.
- Myeloperoxidase (MPO) levels were measured as a marker of inflammation.
- Activity of ADA, AMP-DA, and PNP was assessed in blood and colonic tissue extracts.
Main Results:
- Myeloperoxidase (MPO) levels significantly increased during the initial stages of colitis (days 1, 2, 5) and returned to baseline by day 7.
- Blood and colonic tissue levels of ADA and AMP-DA decreased during the acute phase of colitis (days 1, 2, 5), with no significant changes later.
- PNP levels remained unchanged in both blood and tissue samples throughout the study.
Conclusions:
- An inverse relationship exists between the degree of intestinal inflammation and the activity of ADA and AMP-DA in both systemic circulation and local tissue.
- These findings suggest a potential role for purine deaminases in the pathophysiology of inflammatory bowel diseases.