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LED-Based In Vitro Screening for Assessing Photoactivable Molecules in Bacterial Photodynamic Inactivation

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Published on: January 24, 2025

Hydrogel-Based Sequential Photodynamic Therapy Promotes Wound Healing by Targeting Wound Infection and Inflammation.

Haohuan Li^1,2, Hailong Xie², Jiaman Zhang³

¹State Key Laboratory of Swine and Poultry Breeding Industry, Sichuan Agricultural University, Chengdu 611130, China.

|August 5, 2025

Summary

This study introduces a novel sequential photodynamic therapy (PDT) that combats bacterial infections and reduces inflammation, significantly improving wound healing in preclinical models.

Keywords:

hydrogel inflammation photodynamic therapy sequential treatment wound healing

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Area of Science:

Biomedical Engineering
Photodynamic Therapy
Wound Healing Research

Background:

Impaired wound healing is a major clinical issue, often complicated by bacterial infections and inflammation.
Photodynamic therapy (PDT) effectively targets bacteria but does not address inflammation, limiting its wound healing applications.
A sequential therapeutic approach is needed to manage both infection and inflammation for effective wound repair.

Purpose of the Study:

To develop and evaluate a novel PDT-based sequential therapy for enhanced wound healing.
To address the limitations of traditional PDT in managing wound inflammation alongside bacterial infections.
To optimize therapeutic timing for antibacterial and anti-inflammatory actions using a pH-sensitive indicator.

Main Methods:

Developed a sequential PDT strategy generating reactive oxygen species and nitric oxide (NO) for bacterial elimination.
Incorporated sustained NO release and oxygen delivery for anti-inflammatory effects.
Utilized a pH-sensitive indicator to guide the sequential administration of antibacterial and anti-inflammatory treatments.

Main Results:

The sequential PDT therapy demonstrated enhanced anti-infection efficacy.
Significant alleviation of wound inflammation was observed.
Promoted skin and superficial skeletal muscle repair in mouse, rabbit, and pig models.

Conclusions:

The developed PDT-based sequential therapy effectively treats bacterial infections and inflammation in wounds.
This strategy shows significant potential for advancing PDT applications in wound healing.
The findings support the transformative potential of this approach for clinical wound management.