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Lethal photosensitisation of Staphylococcus aureus

M Wilson1, J Pratten

  • 1Department of Microbiology, Institute of Dental Surgery, University of London, Great Britain.

Microbios
|January 1, 1994
PubMed
Summary

Toluidine blue O (TBO) effectively sensitizes Staphylococcus aureus to low-power helium/neon (HeNe) laser light, enhancing bacterial killing. Higher laser doses also showed significant bacterial reduction, suggesting an endogenous photosensitizer in S. aureus.

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Area of Science:

  • Photodynamic therapy
  • Microbiology
  • Laser technology

Background:

  • Staphylococcus aureus is a common pathogen.
  • Antimicrobial resistance necessitates novel treatment strategies.
  • Photodynamic inactivation (PDI) offers a potential alternative therapy.

Purpose of the Study:

  • To investigate the photosensitizing effect of toluidine blue O (TBO) on Staphylococcus aureus.
  • To determine the efficacy of low-power helium/neon (HeNe) laser in combination with TBO for bacterial killing.
  • To explore the potential for endogenous photosensitization in S. aureus.

Main Methods:

  • Bacterial suspensions of Staphylococcus aureus were prepared.
  • Irradiation was performed using a low-power HeNe laser.
  • Experiments were conducted with and without the addition of TBO.
  • Viable bacterial counts (cfu) were enumerated post-irradiation.

Main Results:

  • A 95% reduction in viable Staphylococcus aureus was observed with 0.88 J of HeNe laser light in the presence of 12.5 µg/ml TBO.
  • No significant reduction in bacterial viability occurred when exposed to the same laser dose without TBO.
  • Higher laser doses (3.5 J) resulted in statistically significant bacterial kills even without TBO, indicating endogenous photosensitization.

Conclusions:

  • Toluidine blue O acts as an effective photosensitizer for Staphylococcus aureus when combined with HeNe laser light.
  • Low-power HeNe laser PDI with TBO demonstrates significant potential for S. aureus inactivation.
  • The presence of an endogenous photosensitizer in Staphylococcus aureus warrants further investigation for therapeutic applications.

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