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

Deyan Luo, Jr Shiuan Lin, Michelle A. Parent, Isis Mullarky-Kanevsky, Frank M. Szaba, Lawrence W. Kummer, Debra K. Duso, Michael Tighe, Jim Hill, Andras Gruber, Nigel Mackman, David Gailani, Stephen T. Smiley

Research output: Contribution to journalArticlepeer-review

25 Scopus citations


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.

Original languageEnglish (US)
Pages (from-to)4149-4161
Number of pages13
JournalJournal of Immunology
Issue number8
StatePublished - Apr 15 2013
Externally publishedYes

ASJC Scopus subject areas

  • Immunology and Allergy
  • Immunology


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