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Mucosal abnormalities in microsporidiosis
W Schmidt1, T Schneider, W Heise
1Department of Medicine, Universitätsklinikum Benjamin Franklin, Free University of Berlin, Germany.
AIDS (London, England)
|November 20, 1997
Summary
Microsporidiosis is common in HIV patients with diarrhea, causing malabsorption by damaging the intestinal lining and reducing enzyme function. This study highlights the link between these infections and gastrointestinal issues in immunocompromised individuals.
Area of Science:
- Gastroenterology
- Infectious Diseases
- Immunology
Background:
- Microsporidiosis is an opportunistic infection affecting immunocompromised individuals, particularly those with HIV.
- Diarrhea is a common symptom in HIV-infected patients, with various potential causes.
Purpose of the Study:
- To determine the prevalence of microsporidiosis in HIV-infected patients with and without diarrhea.
- To characterize mucosal architecture and brush border enzyme alterations in HIV patients with microsporidiosis.
Main Methods:
- 259 HIV-infected patients underwent esophagogastroduodenoscopy.
- Duodenal biopsies were analyzed for microsporidia using electron microscopy.
- Brush border enzyme activities and mucosal architecture were assessed in patients with and without microsporidiosis.
Main Results:
- Microsporidiosis (Enterocytozoon bieneusi, Encephalitozoon intestinalis) was significantly more prevalent in HIV patients with acute or chronic diarrhea compared to those without.
- Microsporidiosis correlated with lactase deficiency and reduced activity of specific brush border enzymes.
- Patients with microsporidiosis exhibited reduced villus height and a significantly decreased villus surface area.
Conclusions:
- The study confirms a strong association between microsporidiosis and diarrhea in HIV-infected patients.
- Malabsorption, resulting from reduced mucosal surface area and impaired enterocyte function, is a key pathophysiological mechanism.
- Microsporidiosis contributes to gastrointestinal symptoms in HIV patients through disruption of intestinal absorptive capacity.