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Human CD8(+) T cells clear Cryptosporidium parvum from infected intestinal epithelial cells

Birte Pantenburg1, Alejandro Castellanos-Gonzalez, Sara M Dann

  • 1Division of Infectious Diseases, Department of Internal Medicine, Department of Microbiology, University of Texas Medical Branch, Galveston, Texas, USA. birte.pantenburg@upch.pe

The American Journal of Tropical Medicine and Hygiene
|March 30, 2010
PubMed

Insights

Cytotoxic CD8(+) T cells help clear intestinal Cryptosporidium infections by reducing parasite load and lysing infected cells. This immune response requires antigen presentation via HLA-A and HLA-B, highlighting a new role for CD8(+) T cells in cryptosporidiosis.

Area of Science:

  • Immunology
  • Infectious Diseases
  • Cell Biology

Background:

  • Cryptosporidium is a significant cause of diarrhea globally, particularly in immunocompromised individuals.
  • CD4(+) T cells and interferon-gamma are known to be crucial for controlling Cryptosporidium infections.
  • Prior research suggested a potential role for CD8(+) T cells in clearing intestinal Cryptosporidium, but this remained unconfirmed in humans.

Purpose of the Study:

  • To investigate the role of CD8(+) T cells in the clearance of intestinal epithelial Cryptosporidium infection in humans.
  • To determine the mechanisms by which CD8(+) T cells might contribute to parasite elimination.

Main Methods:

  • Utilized antigen-expanded sensitized CD8(+) T cells in infected intestinal epithelial cell cultures.
  • Assessed the impact of CD8(+) T cells on parasite load and infected cell lysis.
  • Investigated the role of human leukocyte antigen (HLA)-A and HLA-B in antigen presentation for CD8(+) T cell-mediated clearance.

Main Results:

  • Antigen-expanded CD8(+) T cells significantly reduced parasite load in infected intestinal epithelial cell cultures.
  • CD8(+) T cells were observed to lyse infected intestinal epithelial cells, likely through cytotoxic granule release.
  • Parasite elimination was dependent on antigen presentation via both HLA-A and HLA-B.

Conclusions:

  • Cytotoxic CD8(+) T cells play a previously unrecognized role in clearing intestinal Cryptosporidium infections in humans.
  • The findings suggest a mechanism involving CD8(+) T cell-mediated lysis of infected cells and parasite reduction.
  • This study expands our understanding of the human immune response to cryptosporidiosis, emphasizing the importance of cytotoxic T cell activity.

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