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Antibiotic resistance is a major public health concern that arises when bacteria evolve mechanisms to withstand the effects of antibiotic treatments. This resistance can be intrinsic, acquired through genetic mutations, or transferred between bacteria via horizontal gene transfer. The development of antibiotic resistance poses significant challenges in treating bacterial infections and necessitates ongoing research to develop new therapeutic strategies.Intrinsic resistance occurs when bacterial...
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Can microorganisms develop resistance against light based anti-infective agents?

Sanjay Marasini1, Leon G Leanse2, Tianhong Dai2

  • 1Department of Ophthalmology, New Zealand National Eye Centre, The University of Auckland, New Zealand.

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Light-based antimicrobial therapies like photodynamic therapy and antimicrobial blue light show promise against drug-resistant microbes. Studies suggest resistance to these light treatments is unlikely, but standardized testing is needed.

Keywords:
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Area of Science:

  • Microbiology
  • Biophysics
  • Photochemistry

Background:

  • Antimicrobial resistance is a growing global health threat.
  • Light-based therapies offer novel strategies to inactivate pathogenic microbes.
  • Photodynamic therapy (PDT), ultraviolet (UV) light, and antimicrobial blue light (aBL) are key modalities.

Purpose of the Study:

  • To review the potential of light-based antimicrobial therapies in combating antimicrobial resistance.
  • To explore the mechanisms of microbial inactivation by different light modalities.
  • To assess the likelihood of resistance development to these light-based approaches.

Main Methods:

  • Review of recent publications on light-based antimicrobial therapies.
  • Analysis of mechanisms including reactive oxygen species generation (PDT, aBL, UVA) and direct DNA damage (UVB, UVC).
  • Evaluation of reported microbial resistance to various light modalities.

Main Results:

  • PDT, UVA, UVB, UVC, and aBL demonstrate antimicrobial efficacy against diverse pathogens.
  • Microbial inactivation is achieved through ROS induction or direct DNA absorption.
  • Evidence suggests a low likelihood of resistance development to these multi-targeted light therapies.

Conclusions:

  • Light-based antimicrobial strategies are promising alternatives to conventional antibiotics.
  • The multi-targeted nature of these therapies likely hinders resistance development.
  • Standardized microbial tolerance assessments are recommended to confirm reproducibility and efficacy.