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Optimization of photodynamic therapy using negative pressure.

Priscila Fernanda Campos Menezes1, Michelle Barreto Requena, Vanderlei Salvador Bagnato

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Summary

This study introduces a novel method combining negative pressure with 5-Aminolevulinic acid (5-ALA) cream to enhance protoporphyrin IX (PPIX) formation for photodynamic therapy (PDT). The new technique improves PPIX production and distribution, optimizing PDT efficacy.

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Area of Science:

  • Dermatology
  • Photomedicine
  • Biochemistry

Background:

  • Topical 5-Aminolevulinic acid (5-ALA) is used in photodynamic therapy (PDT) for skin conditions, but its skin penetration is limited.
  • Optimizing 5-ALA delivery is crucial for effective PDT treatment and diagnosis of skin diseases and cancers.

Purpose of the Study:

  • To present an alternative topical photodynamic therapy (PDT) procedure.
  • To enhance protoporphyrin IX (PPIX) formation by combining negative pressure with 5-Aminolevulinic acid (5-ALA) cream occlusion.

Main Methods:

  • Application of 20% 5-ALA cream on a 9 cm(2) skin area with occlusion.
  • Measurement of PPIX production using fluorescence spectroscopy and widefield fluorescence imaging over 7 and 24 hours.
  • Utilizing negative pressure therapy in conjunction with 5-ALA cream application.

Main Results:

  • Negative pressure therapy significantly increased PPIX production, distribution, and elimination compared to the control group.
  • Fluorescence spectroscopy revealed approximately 30% PPIX formation in deeper skin layers.
  • Widefield fluorescence imaging quantified around 20% PPIX formation in superficial skin layers.

Conclusions:

  • Negative pressure induction is a viable method to improve PPIX production for PDT.
  • This approach can optimize PDT efficacy, particularly when PPIX formation is inefficient.
  • The findings offer a promising strategy for enhancing topical PDT treatments.