Factors affecting plasma postheparin diamine oxidase activity

Area of Science:

• Gastroenterology
• Biochemistry
• Clinical Medicine

Background:

• Plasma postheparin diamine oxidase (DAO) activity is explored as a marker for intestinal disorders.
• The precise mechanisms behind reduced plasma DAO activity in Crohn's disease (CD) remain unclear.
• Understanding factors influencing DAO activity is crucial for its clinical application in CD.

Purpose of the Study:

• To investigate the impact of disease extent, location, prior surgery, and therapy on plasma DAO activity in CD patients.
• To correlate plasma DAO activity with disease severity measured by the Crohn's Disease Activity Index (CDAI).

Main Methods:

• Measured plasma postheparin DAO activity in 37 CD patients and 30 healthy volunteers.
• Assessed disease extent (small bowel and colon), location, history of resection, and current therapy.
• Compared DAO activity between patient groups and correlated it with CDAI.

Main Results:

• CD patients exhibited significantly lower DAO activity compared to controls, with higher CDAI.
• No direct correlation was found between DAO activity and CDAI.
• Effective therapy increased DAO activity and decreased CDAI; recurrence showed the opposite trend.
• DAO activity was not influenced by the extent or location of small bowel or colonic disease, nor by prior enterectomy or colectomy.

Conclusions:

• Plasma DAO activity is altered in CD and responds predictably to therapeutic interventions and disease recurrence.
• DAO activity may serve as a valuable tool for monitoring individual CD patient progress.
• The lack of correlation with disease extent/location suggests DAO activity is not solely dependent on enterocyte mass.