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Intestinal inflammation, ileal structure and function in HIV

I Bjarnason1, D R Sharpstone, N Francis

  • 1Department of Clinical Biochemistry, King's College School of Medicine and Dentistry, London, UK.

AIDS (London, England)
|October 1, 1996
PubMed
Summary

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HIV-infected individuals show normal intestinal absorption, but AIDS development impairs these functions. Severe ileal malabsorption occurs in AIDS diarrhea, suggesting bile acid malabsorption plays a role.

Area of Science:

  • Gastroenterology
  • Infectious Diseases
  • Immunology

Background:

  • Human Immunodeficiency Virus (HIV) infection can affect various organ systems, including the gastrointestinal tract.
  • Understanding the impact of HIV on small intestinal absorption, permeability, and ileal function is crucial for managing associated complications.

Purpose of the Study:

  • To investigate small intestinal absorption and permeability in HIV-positive homosexual men.
  • To assess intestinal inflammation and ileal structure and function in different stages of HIV disease.

Main Methods:

  • Employed dual radioisotopic ileal function tests to measure bile acid and vitamin B12 absorption.
  • Utilized 111indium leukocyte studies for quantifying intestinal inflammation.
  • Performed ileocolonoscopy with terminal ileal biopsy for structural analysis.

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Main Results:

  • HIV-infected individuals without AIDS had normal intestinal absorption and permeability.
  • Subjects with AIDS exhibited significant intestinal inflammation, particularly those with diarrhea.
  • Severe malabsorption of bile acids and vitamin B12 was observed in AIDS patients with diarrhea, exceeding that seen in Crohn's ileitis.

Conclusions:

  • Patients with AIDS develop a low-grade enteropathy and significant ileal malabsorption, especially with diarrhea.
  • Minor morphologic changes in the ileum were noted in AIDS patients.
  • Malabsorption of bile acids is implicated as a potential pathogenic factor in AIDS-related diarrhea.