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Pediatric duodenal biopsies: mucosal morphology and glycohydrolase expression do not change along the duodenum
E H Van Beers1, A W Einerhand, J A Taminiau
1Department of Pediatrics, Academic Medical Center, University of Amsterdam, Emma's Childrens Hospital AMC, The Netherlands.
Insights
Proximal and distal duodenal biopsies are equally effective for diagnosing pediatric gastrointestinal issues. Both biopsy locations yield comparable results for mucosal morphology and brush border enzyme expression, simplifying diagnostic procedures.
Area of Science:
- Pediatric Gastroenterology
- Gastrointestinal Histopathology
- Molecular Biology
Background:
- Duodenal biopsies are crucial for diagnosing pediatric upper gastrointestinal complaints.
- The diagnostic utility of proximal versus distal duodenal biopsies remains unclear.
- This study compares proximal and distal duodenal biopsies for morphology and enzyme expression.
Purpose of the Study:
- To evaluate the comparability of proximal and distal duodenal biopsies.
- To assess differences in mucosal morphology between proximal and distal biopsies.
- To compare glycohydrolase expression as an indicator of intestinal epithelial function.
Main Methods:
- Studied duodenal endoscopic biopsies from 64 children (3 months–18 years).
- Collected biopsies from the duodenal bulb (proximal) and distal to the papilla of Vater.
- Assessed crypt/villus morphology, lactase, and sucrase-isomaltase expression via histology and mRNA analysis.
Main Results:
- Observed significant interpatient variation in morphology and enzyme expression.
- Found highly similar morphology and enzyme expression between proximal and distal biopsies within each patient.
- Lactase and sucrase-isomaltase gene expression levels were consistent across biopsy sites.
Conclusions:
- Biopsies from either proximal or distal duodenum are suitable for diagnostic evaluation.
- Both locations provide comparable data for mucosal abnormalities and brush border enzyme activity.
- This finding simplifies the diagnostic approach for pediatric duodenal conditions.
Background:
Duodenal mucosal biopsies are routinely taken for diagnosis in children with complaints of the upper gastrointestinal tract. Surprisingly, little is known about the usefulness of proximal duodenal versus distal duodenal biopsies for routine diagnostic purposes. This study evaluated the comparability of proximal and distal duodenal biopsies with respect to mucosal morphology as well as glycohydrolase expression as an indicator of intestinal epithelial function.
Methods:
Specimens obtained in duodenal endoscopic biopsies from 64 children, ranging in age from 3 months to 18 years with normal or affected mucosa, were studied. Biopsies were performed in anatomically defined regions in the bulbus duodeni (the very proximal part of the duodenum) and distally of the papilla of Vater (distal of the pancreatic duct). Biopsy specimens were paraformaldehyde-fixed for histologic examination and immunohistochemical evaluation or were homogenized to isolate RNA. Crypt/villus morphology was assessed as is routinely determined by pathologists. In addition, several aspects of lactase and sucrase-isomaltase expression as paradigms of intestinal brush border enzymes were assessed: localization at the cellular level, semiquantitative immunohistochemistry, and quantitative measurement of the messenger RNA levels of the respective brush border glycohydrolases.
Results:
As anticipated, there was a wide interpatient variation in mucosal morphology and expression of lactase and sucrase-isomaltase. Nonetheless, the consistent finding was that in each patient, measurements of morphology and lactase and sucrase-isomaltase gene expression were very similar between samples obtained in the proximal and distal biopsies.
Conclusions:
Biopsies performed in either location in the duodenum are equally suitable for diagnostic workup of patients suspected of mucosal abnormalities affecting morphology or small intestinal brush border glycohydrolase activities.