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Modelling Staphylococcus aureus-induced septicemia using NMR.

R Plummer1, J Bodkin, T W Yau

  • 1School of Molecular and Microbial Biosciences, University of Sydney, Sydney, Australia.

Magnetic Resonance in Medicine
|September 28, 2007
PubMed
Summary
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Nuclear Magnetic Resonance (NMR) spectroscopy reveals how Staphylococcus aureus toxins damage red blood cells (RBCs). This method also accurately determines antibiotic effectiveness, aiding clinical microbiology.

Area of Science:

  • Biophysics
  • Microbiology
  • Biochemistry

Background:

  • Staphylococcus aureus secretes alpha-hemolysin, a pore-forming toxin contributing to septic shock.
  • Alpha-hemolysin increases the permeability of mammalian cell membranes, including red blood cells (RBCs).

Purpose of the Study:

  • To investigate the molecular mechanisms of bacterial attack on RBCs using NMR spectroscopy.
  • To evaluate the potential of NMR spectroscopy for determining antibiotic efficacy against S. aureus.

Main Methods:

  • Utilized 31P NMR spectroscopy with probe molecules (DMMP and HPA) in RBC suspensions.
  • Monitored changes in intra- and extracellular resonances to assess RBC membrane permeability.
  • Determined minimal inhibitory concentrations (MICs) of oxacillin and erythromycin for S. aureus strains.

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Main Results:

  • NMR peak coalescence indicated increased RBC membrane permeability upon exposure to S. aureus or alpha-hemolysin.
  • This permeability increase led to intracellular protein leakage and altered solute exchange rates.
  • Antibiotic addition prevented peak coalescence, allowing for accurate MIC determination.

Conclusions:

  • NMR spectroscopy effectively demonstrates RBC membrane damage induced by S. aureus toxins.
  • The method provides accurate MIC values comparable to standard clinical methods.
  • NMR spectroscopy shows promise as a tool in clinical microbiology for rapid antibiotic susceptibility testing.