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Ultrastructural changes in the duodenal mucosa of HIV-infected children

M Fontana1, R Boldorini, G Zuin

  • 1Fourth Pediatric Department, University of Milan Medical School, Italy.

Journal of Pediatric Gastroenterology and Nutrition
|October 1, 1993
PubMed

Insights

Human immunodeficiency virus (HIV) infection in children causes unique microvillar damage in the gut, even with normal histology. These ultrastructural changes may explain chronic gastrointestinal issues in affected children.

Area of Science:

  • Gastroenterology
  • Pediatric Infectious Diseases
  • Cell Biology

Background:

  • Chronic gastrointestinal symptoms are common in children with human immunodeficiency virus (HIV) infection.
  • Conventional histology often fails to reveal the underlying cause of these symptoms in HIV-infected children.
  • Understanding the cellular basis of gastrointestinal pathology in pediatric HIV is crucial for effective management.

Purpose of the Study:

  • To investigate the ultrastructural changes in duodenal biopsy specimens from HIV-infected children with chronic gastrointestinal symptoms.
  • To compare these ultrastructural findings with those in HIV-negative children, including those with celiac disease.
  • To determine if observed ultrastructural changes can explain the gastrointestinal manifestations in pediatric HIV.

Main Methods:

  • Electron microscopy was used to examine duodenal biopsy specimens from six HIV-infected children and nine HIV-negative children (four with celiac disease).
  • Histological examination of the duodenal mucosa was performed.
  • Pathogen identification (viral, bacterial, protozoan) was attempted.

Main Results:

  • All HIV-infected children exhibited a consistent pattern of microvillar damage (short, irregular, and basally joined microvilli) on electron microscopy, irrespective of normal conventional histology.
  • A similar, though less pronounced, microvillar pattern was observed in only three of four celiac children with severe mucosal atrophy.
  • No infectious pathogens were identified. Tubuloreticular inclusions were noted in endothelial cells of HIV-infected children.

Conclusions:

  • A distinct ultrastructural microvillar damage pattern is a consistent finding in the duodenal mucosa of HIV-infected children with chronic gastrointestinal symptoms.
  • This specific microvillar pathology, along with endothelial tubuloreticular inclusions, may be the underlying cause of gastrointestinal dysfunction in pediatric HIV.
  • Electron microscopy is a valuable tool for diagnosing gastrointestinal pathology in HIV-infected children when conventional histology is inconclusive.

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