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- W820278315 abstract "Yersinia pestis, the causative agent of plague, is estimated to have claimed the lives of 30-50% of the European population in five years. Although it can now be controlled through antibiotics, there are still lurking dangers of outbreaks from biowarfare and bioterrorism; therefore, ongoing research to further our understanding of its strong virulence factors is necessary for development of new vaccines. Many Gram-negative bacteria, including Y. pseudotuberculosis, the evolutionary ancestor of Y. pestis, produce a hexa-acylated lipid A/LPS which can strongly trigger innate immune responses via activation of Toll-like receptor 4 (TLR4)-MD2. In contrast, Y. pestis grown at 37oC generates a tetra-acylated lipid A/LPS that poorly induces TLR4-mediated immune activation. We have reported that expression of E. coli lpxL in Y. pestis, which lacks a homologue of this gene, forces the biosynthesis of a hexaacylated LPS, and that this single modification dramatically reduces virulence in wild type mice, but not in mice lacking a functional TLR4. This emphasizes that avoiding activation of innate immunity is important for Y. pestis virulence. It also provides a model in which survival is strongly dependent on innate immune defenses, presenting a unique opportunity for evaluating the relative importance of innate immunity in protection against bacterial infection. TLR signaling is critical for the sensing of pathogens, and one implication of TLR4 engagement is the induction of the pro-forms of the potent inflammatory cytokines IL-1β and IL-18. Therefore Y. pestis is able to suppress production of these which are generated through caspase-1-activating nucleotide-binding domain and leucine-rich repeat (NLR)-containing inflammasomes. For my thesis, I sought to elucidate the role of NLRs and IL-18/IL-1β during bubonic and pneumonic vii" @default.
- W820278315 created "2016-06-24" @default.
- W820278315 creator A5045856086 @default.
- W820278315 date "2013-01-01" @default.
- W820278315 modified "2023-09-23" @default.
- W820278315 title "Inflammasomes and the Innate Immune Response Against Yersinia Pestis: A Dissertation" @default.
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