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Related Experiment Videos

Enteric immunologic abnormalities in human immunodeficiency virus infection.

R Ullrich1, M Zeitz, E O Riecken

  • 1Department of Gastroenterology, Medical Clinic, Free University of Berlin, Germany.

Seminars in Liver Disease
|May 1, 1992
PubMed
Summary

Human Immunodeficiency Virus (HIV) infects intestinal immune cells, altering their function and potentially damaging the gut barrier. This can lead to opportunistic infections and bowel issues in patients.

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Area of Science:

  • Immunology
  • Gastroenterology
  • Virology

Background:

  • The intestinal mucosa is a primary entry point for Human Immunodeficiency Virus (HIV).
  • HIV-infected mononuclear cells are prevalent in the intestinal lamina propria of 30-50% of infected individuals, even early in the disease.
  • HIV's effect on intestinal epithelial cells remains controversial.

Purpose of the Study:

  • To investigate the impact of HIV infection on the intestinal immune system.
  • To understand the distinct characteristics of intestinal T cells compared to circulating T cells.
  • To explore the consequences of these changes on mucosal immunity and gut health.

Main Methods:

  • Immunohistologic studies of intestinal lamina propria.
  • Analysis of T cell populations (CD4+, CD8+, CD25+).

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  • Assessment of B cell differentiation and immunoglobulin A (IgA) secretion.

    • Main Results:

    • HIV infection alters intestinal T cell populations, decreasing the CD4 to CD8 ratio and reducing CD25 expression.
    • B cell differentiation is impaired, with reduced IgA plasma cells and IgA2 secretion.
    • Changes in intraepithelial lymphocytes require further clarification.

    Conclusions:

    • HIV-induced depletion or dysfunction of mucosal lymphocytes compromises the gut immune barrier, increasing susceptibility to opportunistic diseases.
    • Alterations in the mucosal immune system may contribute to partial bowel atrophy and enterocyte maturational defects in HIV-infected patients.