Fibrin facilitates both innate and T cell-mediated defense against Yersinia pestis.

Luo D, Lin JS, Parent MA, Mullarky-Kanevsky I, Szaba FM, Kummer LW, Duso DK, Tighe M, Hill J, Gruber A, Mackman N, Gailani D, Smiley ST
J Immunol. 2013 190 (8): 4149-61

PMID: 23487423 · PMCID: PMC3622124 · DOI:10.4049/jimmunol.1203253

The Gram-negative bacterium Yersinia pestis causes plague, a rapidly progressing and often fatal disease. The formation of fibrin at sites of Y. pestis infection supports innate host defense against plague, perhaps by providing a nondiffusible spatial cue that promotes the accumulation of inflammatory cells expressing fibrin-binding integrins. This report demonstrates that fibrin is an essential component of T cell-mediated defense against plague but can be dispensable for Ab-mediated defense. Genetic or pharmacologic depletion of fibrin abrogated innate and T cell-mediated defense in mice challenged intranasally with Y. pestis. The fibrin-deficient mice displayed reduced survival, increased bacterial burden, and exacerbated hemorrhagic pathology. They also showed fewer neutrophils within infected lung tissue and reduced neutrophil viability at sites of liver infection. Depletion of neutrophils from wild-type mice weakened T cell-mediated defense against plague. The data suggest that T cells combat plague in conjunction with neutrophils, which require help from fibrin to withstand Y. pestis encounters and effectively clear bacteria.

MeSH Terms (12)

Animals Bacterial Proteins Fibrin Fibrinogen Immunity, Innate Mice Mice, Inbred C57BL Mice, Knockout Plague Plasminogen Activators T-Lymphocyte Subsets Yersinia pestis

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