Abstract
Evidence is emerging rapidly that heat shock protein, gp96, plays a critical role in various infectious diseases. Herein, I emphasize the role of gp96 in the pathogenesis of E. coli K1 meningitis. E. coli K1 is the most common neonatal meningitis-causing Gram-negative bacterium, which interacts with gp96 via outer membrane protein A (OmpA) on both neutrophils and human brain microvascular endothelial cells (HBMEC). E. coli K1 infection induces the surface expression of gp96 in neutrophils, using it as a receptor for entering cells and suppressing the production of reactive oxygen species. Thus, the bacterium survives and multiplies inside neutrophils to achieve high-grade bacteremia. E. coli K1 subsequently interacts with HBMEC gp96 (Ecgp96), to induce a variety of signaling pathways for bacterial invasion of the blood–brain barrier and temporarily disrupts the tight junctions between the cells. Of note, E. coli K1 attachment to HBMEC promotes the interaction of Ecgp96 with TLR2 to form a complex, Ecgp96/TLR2, which then translocates to the cell surface. The binding of E. coli K1 OmpA to Ecgp96/TLR2 enhances the production of inducible nitric oxide, which is, in turn, responsible for more Ecgp96 expression at the cell surface and subsequent tight junction disruption.
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Acknowledgments
I sincerely thank my past and current members of the lab for their contribution to gp96 research. I also thank Krishna Nemani for critical reading of this chapter. The funding for my research is provided by Public Health Service grants (AI40567, NS73115, HD43550 and NS70112) from the National Institutes of Health, USA, American Heart Association grants, and by the Children’s Hospital Los Angeles Research Fellowships.
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Prasadarao, N.V. (2013). Escherichia coli K1 Meningitis and Heat Shock Protein, gp96. In: Henderson, B. (eds) Moonlighting Cell Stress Proteins in Microbial Infections. Heat Shock Proteins, vol 7. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-6787-4_23
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