1921
Volume 82, Issue 4
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645

Abstract

Abstract.

Intracellular protozoans of the genus are a major cause of diarrheal illness worldwide, especially in immunocompromised individuals. CD4 T cells and interferon-gamma are key factors in the control of cryptosporidiosis in human and murine models. Previous studies led us to hypothesize that CD8 T cells contribute to clearance of intestinal epithelial infection in humans. We report here that antigen expanded sensitized CD8 T cells reduce the parasite load in infected intestinal epithelial cell cultures and lyse infected intestinal epithelial cells. These effects are most likely mediated by the release of cytotoxic granules. Elimination of parasites seems to require antigen presentation through both human leukocyte antigen (HLA)-A and HLA-B. These data suggest that cytotoxic CD8 T cells play a role in clearing from the intestine, a previously unrecognized feature of the human immune response against this parasite.

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2010-04-01
2017-09-24
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  • Received : 30 Sep 2009
  • Accepted : 09 Jan 2010

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