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Intestinal disaccharidase and alkaline phosphatase activity in giardiasis
Insights
Giardiasis in children frequently causes brush-border enzyme deficiencies, impacting digestion and carbohydrate tolerance. This study found no significant structural damage to the small intestine, but enzyme activity was reduced in many patients.
Area of Science:
- Pediatric Gastroenterology
- Infectious Diseases
- Biochemistry
Background:
- Giardiasis is a common intestinal infection in children.
- The impact of Giardia lamblia infection on small intestinal brush-border enzymes is not fully understood.
- Understanding these effects is crucial for managing pediatric gastrointestinal symptoms.
Purpose of the Study:
- To investigate small intestinal brush-border enzyme activities in children with giardiasis.
- To correlate enzyme deficiencies with clinical presentation and histopathology.
- To elucidate the pathogenic mechanisms of giardiasis in the pediatric population.
Main Methods:
- Assessed disaccharidase (lactase, sucrase, maltase) and alkaline phosphatase activities.
- Analyzed enzyme levels in 22 children diagnosed with giardiasis.
- Examined duodenal mucosal biopsies for villus morphology via light microscopy.
Main Results:
- 41% of children showed reduced disaccharidase activities, often affecting multiple enzymes.
- 33% had decreased intestinal alkaline phosphatase activity, exclusively in those with disaccharidase deficiencies.
- Mild villus atrophy was observed in two cases; others had normal morphology.
Conclusions:
- Giardiasis in children does not typically cause severe structural damage to the small bowel mucosa.
- Frequent depression of brush-border enzymes indicates damage to the brush border.
- Enzyme deficiencies likely contribute to diarrhea and carbohydrate intolerance in affected children.
Abstract:
We report results on determinations of small intestinal brush-border enzyme activities in 22 children (aged 11 months to 14 years) with giardiasis. In particular, activities of disaccharidases (lactase, sucrase, maltase) and of alkaline phosphatase were investigated. Forty-one percent of the patients, irrespective of age, had a demonstrable depression of disaccharidase activities, usually in a combination involving two or more enzymes. A depression of intestinal alkaline phosphatase activity was present in 33% of patients, and only in those who demonstrated disaccharidase deficiencies. Mild villus atrophy was present in two mucosal specimens, whereas all others showed normal villus morphology by light microscopy. The results obtained in this study suggest that giardiasis in otherwise healthy children does not cause marked structural damage to the small bowel mucosa, as seen by the light microscope. However, some form of damage to the brush border does occur frequently, as evidenced by a depression of brush-border enzymes. This damage most likely contributes to the diarrhea and also to the carbohydrate intolerance in these patients.