Springer Seminars in Immunopathology

, Volume 18, Issue 4, pp 515–533 | Cite as

Immunopathology of human immunodeficiency virus infection in the gastrointestinal tract

  • Thomas Schneider
  • Reiner Ullrich
  • Martin Zeitz
Article

Conclusion

The intestinal (in particular rectal) mucosa is an important portal of entry of HIV in homosexual men, who represent the vast majority of HIV-infected patients in Europe and North America. There are several possibilities for HIV to reach the CD4+ T cells, macrophages and follicular dendritic cells in the intestinal mucosa. HIV may be transported through M cells directly to mucosal lymphoid follicles. Alternatively, HIV may infect enterocytes via the Fc-receptor by antibody-bound HIV or via a CD4-independent receptor. By successive budding on the basal side of enterocytes HIV may be released into the lamina propria. Furthermore, in patients not infected by the intestinal route, HIV may also rapidly enter the intestinal mucosa by other mechanisms. Intestinal T lymphocytes are mainly activated memory T cells reentering the mucosal surfaces after circulating through the peripheral blood. In the periphery they may be preferentially infected by HIV. Accumulation of infected T cells could thus occur in the intestinal mucosa. The special phenotypical and functional characteristics of intestinal T lymphocytes may affect the replication and cytopathology of HIV, resulting in an accelerated loss of CD4+ T cells in the lamina propria. CD4 T cells play a critical role in antigen-dependent B cell differentiation, thus the pronounced CD4 T cell depletion in the intestinal mucosa may be responsible for the observed decrease of IgA plasma cells and a reduced secretion of IgA2. Depletion and functional impairment of activated mucosal LPL with consequent altered cytokine secretion in HIV infection could explain the breakdown of the mucosal immune barrier, leading to secondary opportunistic or nonopportunistic infections and secondary malignancies. Furthermore, several viral factors like thenef gene product may influence T cell activation and function, especially in the gastrointestinal tract contributing to the observed pronounced and early loss of CD4 T cells in the mucosal lamina propria. In addition, due to the interrelation between the mucosal immune system and epithelium, these changes might be responsible for the partial small intestinal mucosal atrophy and maturational defects in enterocytes observed in HIV-infected patients.

Keywords

Human Immunodeficiency Virus Human Immunodeficiency Virus Infection Lamina Propria Intestinal Mucosa Lymphoid Follicle 

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Copyright information

© Springer-Verlag 1997

Authors and Affiliations

  • Thomas Schneider
    • 1
  • Reiner Ullrich
    • 2
  • Martin Zeitz
    • 1
  1. 1.Medical Clinic 11University of the SaarlandHomburg/SaarGermany
  2. 2.Department of Gastroenterology, Medical Clinic, Klinikum Benjamin FranklinFree University of BerlinGermany

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