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J Infect Dis. 2006 Jan 15;193(2):223-30. Epub 2005 Dec 14.

Colonic bacterial infection abrogates eosinophilic pulmonary disease.

Author information

1
Kennedy Institute of Rheumatology, Charing Cross Campus, Imperial College, London, United Kingdom.

Abstract

Induction of immunity to one pathogen in the lungs modifies the microenvironment and alters immunopathological changes that result from a second, unrelated pulmonary infection. However, it is unclear whether immunity generated at distant sites also affects lung immune responses. Here, we show that infection with the gut-restricted bacterium Citrobacter rodentium modifies immunopathological changes that result from pulmonary Cryptococcus neoformans infection. Th2 cytokine-driven pulmonary eosinophilia induced by C. neoformans infection was reduced, and the enhanced Th1 cytokine environment afforded more-rapid clearance of the fungus in C. rodentium-immune mice. The activated and intraepithelial (CD103+) T cell populations that expand after C. neoformans infection were diminished in C. rodentium-immune mice. T cell cross-reactivity was absent, but cross-reactive antibodies were detected. It is of importance to the "hygiene hypothesis" that these data indicate that an immune response induced by a gut-restricted pathogen can modify the immune outcome after pulmonary infection, suggesting that cell-phenotype modifications occur across mucosal sites.

PMID:
16362886
DOI:
10.1086/498915
[Indexed for MEDLINE]

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