Virulent Toxoplasma gondii strain RH promotes T-cell-independent overproduction of proinflammatory cytokines IL12 and gamma-interferon.

Abstract:

:The aim of this study was the analysis of the cytokine response in BALB/c mice infected with the highly virulent RH or the weakly virulent Beverley strains of Toxoplasma gondii. Analysis of cytokine messages showed increased expression of IL12, IFN-gamma and TNF-alpha, but not IL4 mRNAs in spleen cells after infection with the T. gondii strains RH and Beverley. High levels of circulating IL12 and IFN-gamma were detected in the serum of mice infected with strain RH, although TNF-alpha levels remained low. In contrast, the same cytokines were detected at only low levels in the serum of mice infected with the Beverley strain. Administration of antibody against IL12 or IFN-gamma significantly delayed time to death of mice infected with strain RH compared to controls. T-Cell-deficient as well as normal mice were equally infected by strain RH, suggesting that T lymphocytes do not contribute to the response. Depletion of natural killer cells from the splenocyte population abolished the in vitro production of IFN-gamma. Together, our data suggest that the virulent strain RH induces in BALB/c mice a type 1 cytokine pattern with T-cell-independent overproduction of IL12 and IFN-gamma that may be involved in the pathogenesis of this micro-organism.

journal_name

J Med Microbiol

authors

Nguyen TD,Bigaignon G,Markine-Goriaynoff D,Heremans H,Nguyen TN,Warnier G,Delmee M,Warny M,Wolf SF,Uyttenhove C,Van Snick J,Coutelier JP

doi

10.1099/jmm.0.04860-0

keywords:

subject

Has Abstract

pub_date

2003-10-01 00:00:00

pages

869-876

issue

Pt 10

eissn

0022-2615

issn

1473-5644

journal_volume

52

pub_type

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