Disaccharidase activities in jejunal fluid

Area of Science:

• Gastroenterology
• Biochemistry
• Pediatric Medicine

Background:

• Disaccharidase enzymes are crucial for carbohydrate digestion in the small intestine.
• Assessing intestinal mucosal enzyme activity is important for diagnosing pediatric digestive disorders.
• Jejunal biopsy is an invasive method for obtaining tissue samples.

Purpose of the Study:

• To investigate the correlation between disaccharidase enzyme activities in jejunal fluid and mucosal tissue.
• To determine if jejunal fluid enzyme measurements can serve as a non-invasive indicator of mucosal enzyme status.
• To evaluate the potential of using jejunal fluid analysis in pediatric patients.

Main Methods:

• Simultaneous collection of jejunal fluid and mucosal tissue from 29 children.
• Measurement of lactase, maltase, and sucrase activities in both fluid and tissue samples.
• Analysis of enzyme activity correlations and kinetic properties between fluid and tissue.

Main Results:

• Highly significant positive correlations were found between fluid and tissue enzyme activities for lactase, maltase, and sucrase.
• Relative enzyme concentrations (sucrase: lactase ratio) also showed strong positive correlation between fluid and tissue.
• Kinetic studies supported a mucosal origin for enzymes detected in jejunal fluid.

Conclusions:

• Jejunal fluid disaccharidase activities closely reflect local jejunal mucosal enzyme values.
• Jejunal fluid enzyme measurements may offer a viable, less invasive method for assessing mucosal enzyme activity.
• This approach could be particularly valuable for infants and children where jejunal biopsy is challenging.