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UPEC hemolysin: more than just for making holes.

Sheryl S Justice1, David A Hunstad

  • 1Center for Microbial Pathogenesis, The Research Institute at Nationwide Children's Hospital, Columbus, OH 43205, USA. sheryl.justice@nationwidechildrens.org

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Uropathogenic Escherichia coli (UPEC) trigger bladder cell shedding during cystitis. Hemolysin, a toxin, surprisingly targets host pathways to promote UPEC infection and spread.

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Area of Science:

  • Microbiology
  • Urology
  • Cell Biology

Background:

  • Acute cystitis is often caused by uropathogenic Escherichia coli (UPEC).
  • UPEC infection leads to bladder epithelial cell exfoliation, a process that can eliminate infected cells but also aid bacterial spread.
  • The precise mechanisms driving UPEC-induced exfoliation remain incompletely understood.

Purpose of the Study:

  • To elucidate the molecular mechanisms by which UPEC induces bladder epithelial cell exfoliation.
  • To identify specific UPEC effectors involved in modulating host cell responses during cystitis.
  • To investigate the role of hemolysin in UPEC-mediated pathogenesis and host cell targeting.

Main Methods:

  • Utilized in vitro cell culture models of bladder epithelium.
  • Employed genetic manipulation of UPEC strains to assess the function of specific virulence factors.
  • Analyzed host cell signaling pathways and cytolytic effects in response to UPEC infection.

Main Results:

  • Dhakal and Mulvey (2012) identified hemolysin as a key UPEC effector.
  • Hemolysin was shown to induce bladder epithelial cell exfoliation through multiple host pathway interactions.
  • This toxin facilitates UPEC dissemination by promoting host cell damage and shedding.

Conclusions:

  • Hemolysin is a critical virulence factor for UPEC in the context of acute cystitis.
  • UPEC leverages hemolysin to manipulate host cell exfoliation, promoting bacterial survival and spread.
  • Targeting hemolysin activity may represent a therapeutic strategy against UPEC infections.