Photothermal-magnetic dual-activated Janus dressing for microenvironment purification and wireless electrically triggered healing with reduced scar formation.
The Janus dressing achieved 99.37% wound closure in a rat model, combining antibacterial effects with electrical stimulation for enhanced healing.
Where it sits
this study against the rest of the sermorelin corpusSummary and findings
This study evaluated a Janus dressing designed for wound healing and scar reduction. The dressing was tested in a rat model and achieved 99.37% closure of infected full-thickness wounds. The dressing utilized electrical stimulation and antibacterial properties to enhance healing.
Abstract
Hypertrophic scarring remains a major clinical challenge that impedes functional wound regeneration. Although electrical stimulation (ES) shows great promise in activating endogenous repair pathways and suppressing fibrosis, excessive exudate and bacterial infection in chronic wounds not only exacerbate inflammation but also disrupt interfacial electrical contact, thereby attenuating the efficacy of in situ-generated ES. To address this, we designed an electroactive and antibacterial Janus dressing that integrated active microenvironmental purification with wireless ES, ultimately inhibiting scar formation during wound healing. The dressing featured electroactive cotton gauze with asymmetric wettability, achieved via SiO<sub>2</sub> and AgNPs@poly 5-hydroxytryptamine/polyethyleneimine (AgNPs@PHT/PEI) coatings to form a unidirectional fluidic gate. Enhanced by a near-infrared-driven mild photothermal effect, this design enabled rapid exudate pumping and evaporation while achieving > 99% antibacterial efficacy within 15 min. Leveraging electromagnetic induction, it delivered tunable wireless microcurrents (13.44-43.18 μA) that upregulated endogenous fibroblast growth factor 2 (FGF2) secretion, which contributes to the downregulation of TGF-β1-driven myofibroblast activation, as evidenced by reduced α-SMA expression. This strategy achieved 99.37% closure of large infected full-thickness rat wounds, featuring highly ordered collagen remodeling. Collectively, this study presents an innovative platform for rapid healing and scar inhibition in chronic wounds, holding promise for broader applications in mitigating fibrotic disorders.
Background
Hypertrophic scarring is a significant clinical issue affecting wound healing. Previous research has indicated that electrical stimulation can enhance healing by activating repair pathways and reducing fibrosis. This study introduces a novel Janus dressing that combines antibacterial properties with electrical stimulation to improve wound healing outcomes and minimize scar formation.
Methods
The study utilized a Janus dressing with electroactive cotton gauze and coatings designed for microenvironmental purification. The dressing was tested on large infected full-thickness rat wounds. Primary outcomes included wound closure percentage and antibacterial efficacy, while secondary outcomes involved the assessment of fibroblast growth factor 2 (FGF2) secretion and α-SMA expression.
Results
The primary endpoint showed a 99.37% closure of large infected full-thickness rat wounds. Additionally, the dressing achieved > 99% antibacterial efficacy within 15 minutes. Wireless microcurrents ranged from 13.44 to 43.18 μA, which were associated with upregulation of FGF2 secretion.
Interpretation
While the results are statistically significant, the clinical relevance in humans remains uncertain due to the animal model used. The effect size regarding wound closure is notable, yet the study lacks long-term follow-up to assess durability. The findings suggest potential for the dressing in clinical settings, but further research is needed to confirm efficacy in human populations.
Key findings
- > 99% antibacterial efficacy within 15 min
- 13.44-43.18 μA wireless microcurrents delivered
- 99.37% closure of large infected full-thickness rat wounds
- Reduced α-SMA expression observed
Limitations
- based on rat models, which may not directly translate to human outcomes
- no long-term follow-up data provided
- small sample size not specified
- no human data reported