The mechanisms whereby certain mouse strains develop persistent intestinal infection with Entamoeba histolytica remain 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)-gamma, were suppressed. Depletion of IL-4 cleared infection by 14 days post-challenge, and this clearance correlated with and was mediated by IFN-gamma. The protective role for IFN-gamma was not strain-specific, as 129 background IFN-gammaR 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. histolytica infection through suppression of protective IFN-gamma and provide a possible explanation for why certain humans spontaneously clear amebiasis while others progress to invasive disease.
Persistence of Entamoeba histolytica infection in CBA mice owes to intestinal IL-4 production and inhibition of protective IFN-γ
CBA 마우스에서 Entamoeba histolytica 감염의 지속성은 장에서 IL-4 생산과 보호적인 IFN-γ의 억제에 기인한다.
[Category] 세균성이질,
[Article Type] journal-article
[Source] pubmed
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