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ADAM10 mediates vascular injury induced by Staphylococcus aureus α-hemolysin

Michael E Powers1, Hwan Keun Kim, Yang Wang

  • 1Department of Microbiology, The University of Chicago, Illinois 60637, USA.

The Journal of Infectious Diseases
|April 5, 2012
PubMed

Insights

Staphylococcus aureus sepsis severity is driven by its alpha-hemolysin toxin. This toxin damages endothelial cells by activating ADAM10, leading to barrier dysfunction, but ADAM10 inhibition offers a potential therapy.

Area of Science:

  • Microbiology
  • Pathophysiology
  • Molecular Biology

Background:

  • Staphylococcus aureus is a major cause of bacteremia and sepsis.
  • The role of S. aureus in endothelial interactions during bloodstream infections is not fully understood.

Purpose of the Study:

  • To investigate the role of staphylococcal alpha-hemolysin in sepsis pathogenesis.
  • To elucidate the mechanism by which alpha-hemolysin affects endothelial cells.
  • To explore therapeutic strategies targeting this pathway.

Main Methods:

  • Utilized a murine sepsis model to assess virulence.
  • Examined the interaction of alpha-hemolysin with its receptor, ADAM10, on endothelial cells.
  • Investigated the effect of ADAM10 activity on endothelial barrier function and vascular endothelial-cadherin.
  • Evaluated the efficacy of ADAM10 inhibition in mitigating sepsis severity.

Main Results:

  • Alpha-hemolysin is essential for full virulence in a murine sepsis model.
  • Alpha-hemolysin binding to ADAM10 upregulates its metalloprotease activity.
  • This leads to vascular endothelial-cadherin cleavage and loss of endothelial barrier integrity.
  • Inhibition of ADAM10 significantly reduced cellular injury and sepsis severity.

Conclusions:

  • Staphylococcal alpha-hemolysin directly injures endothelial cells by modulating ADAM10 activity.
  • This mechanism contributes significantly to the pathophysiology of staphylococcal sepsis.
  • Targeting ADAM10 presents a promising therapeutic avenue for treating S. aureus sepsis.

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