Journal
PLOS ONE
Volume 6, Issue 8, Pages -Publisher
PUBLIC LIBRARY SCIENCE
DOI: 10.1371/journal.pone.0023135
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Funding
- Brazilian Council of Science and Technology (CNPq)
- CNPq/ANPCyT [490528/2008-2]
- Research Foundation of the State of Minas Gerais (FAPEMIG)
- Brazilian Agency for Development of Graduate Courses (CAPES/PNPD)
- CNPq/MAPA
- CNPq/REPENSA
- National Institute of Science and Technology on Vaccines (INCTV)
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Type I interferons (IFNs) are cytokines that orchestrate diverse immune responses to viral and bacterial infections. Although typically considered to be most important molecules in response to viruses, type I IFNs are also induced by most, if not all, bacterial pathogens. In this study, we addressed the role of type I IFN signaling during Brucella abortus infection, a facultative intracellular bacterial pathogen that causes abortion in domestic animals and undulant fever in humans. Herein, we have shown that B. abortus induced IFN-beta in macrophages and splenocytes. Further, IFN-beta induction by Brucella was mediated by IRF3 signaling pathway and activates IFN-stimulated genes via STAT1 phosphorylation. In addition, IFN-beta expression induced by Brucella is independent of TLRs and TRIF signaling but MyD88-dependent, a pathway not yet described for Gram-negative bacteria. Furthermore, we have identified Brucella DNA as the major bacterial component to induce IFN-beta and our study revealed that this molecule operates through a mechanism dependent on RNA polymerase III to be sensed probably by an unknown receptor via the adaptor molecule STING. Finally, we have demonstrated that IFN-alpha beta R KO mice are more resistant to infection suggesting that type I IFN signaling is detrimental to host control of Brucella. This resistance phenotype is accompanied by increased IFN-gamma and NO production by IFN-alpha beta Rho R KO spleen cells and reduced apoptosis.
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