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Susceptibility of non-enveloped DNA- and RNA-type viruses to photodynamic inactivation

Liliana Costa1, João P C Tomé, Maria G P M S Neves

  • 1Department of Biology and CESAM, University of Aveiro, 3810-193 Aveiro, Portugal.

Photochemical & Photobiological Sciences : Official Journal of the European Photochemistry Association and the European Society for Photobiology
|August 23, 2012
PubMed

Insights

RNA-type phages are more susceptible to photodynamic inactivation than DNA-type phages. This study compared the photoinactivation of DNA and RNA non-enveloped phages using a tricationic porphyrin, finding significant differences in susceptibility.

Area of Science:

  • Virology
  • Photochemistry
  • Antiviral research

Background:

  • Photodynamic inactivation (PDI) is a promising antiviral strategy.
  • The differential susceptibility of various virus types to PDI remains under-investigated.
  • Understanding these differences is crucial for optimizing PDI efficacy.

Purpose of the Study:

  • To compare the susceptibility of DNA- and RNA-type viruses to photodynamic inactivation.
  • To evaluate the efficacy of the tricationic porphyrin Tri-Py(+)-Me-PF against different viral types.
  • To elucidate the influence of viral genetic material on PDI outcomes.

Main Methods:

  • Photodynamic inactivation assays were performed on four DNA non-enveloped phages and three RNA non-enveloped phages.
  • The tricationic porphyrin Tri-Py(+)-Me-PF was used as the photosensitizer.
  • Viral inactivation was quantified based on plaque-forming unit counts post-treatment.

Main Results:

  • Significant differences in photodynamic inactivation efficiency were observed between DNA and RNA phages.
  • RNA-type phages demonstrated markedly higher susceptibility to photoinactivation compared to DNA-type phages.
  • The study highlights the impact of viral genome type on PDI effectiveness.

Conclusions:

  • Viral genome type is a critical factor determining susceptibility to photodynamic inactivation.
  • RNA viruses are more vulnerable to PDI mediated by Tri-Py(+)-Me-PF than DNA viruses.
  • These findings contribute to the development of targeted PDI strategies for viral control.

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