| Autor: |
Guo, X, Stroup, S E, Houpt, E R |
| Zdroj: |
Mucosal immunology; March 2008, Vol. 1 Issue: 2 p139-146, 8p |
| Abstrakt: |
The mechanisms whereby certain mouse strains develop persistent intestinal infection with Entamoeba histolyticaremain unclear. In this work, we characterized the kinetic pattern of cytokine responses during the course of natural infection in CBA mice and showed that intracecal amebic infection led to a rapid and sustained upregulation of Th2 (IL-4, IL-5, IL-13) and Th17 cytokine responses while Th1 cytokines, IL-12p35 and interferon (IFN)-γ, were suppressed. Depletion of IL-4 cleared infection by 14 days post-challenge, and this clearance correlated with and was mediated by IFN-γ. The protective role for IFN-γ was not strain-specific, as 129 background IFN-γR knockout mice exhibited a higher infection rate than their wild-type littermates. These studies indicate that IL-4 plays a critical pathogenic role in the persistence of E. histolyticainfection through suppression of protective IFN-γ and provide a possible explanation for why certain humans spontaneously clear amebiasis while others progress to invasive disease. |
| Databáze: |
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