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Updated: Jan 5, 2026
A Mouse Model of Mechanotransduction-driven, Human-like Hypertrophic Scarring
Published on: November 29, 2024
Research on function and mechanisms of a novel small molecule WG449E for hypertrophic scar
1East China Normal University and Shanghai Fengxian District Central Hospital Joint Center for Translational Medicine, Shanghai Key Laboratory of Regulatory Biology, Institute of Biomedical Sciences and School of Life Sciences, East China Normal University, Shanghai, China.
Background:
Hypertrophic scars are complications of severe wound healing characterized by excessive fibrosis associated with aberrant function of fibroblasts. However, no available drugs can be utilized to effectively treat these scars. The transforming growth factor β (TGFβ) signalling pathway regulates collagen synthesis and plays an important role in scar formation.
Objectives:
To evaluate the anti-scar effects of TGFβ inhibitors in vitro and in vivo.
Methods:
Col1α2-luciferase reporter assay was used to screen the compounds suppress type I collagen gene transcription. Sulforhodamine B colorimetric assay and colony formation assay were used to test the compound's effect on cell proliferation. Wound healing and transwell assay were performed to test the cell migration and invasion. Western blotting, immunofluorescence, immunohistochemistry and Q-PCR assay were used to determine the protein and mRNA levels. 3D cell contraction assay was used to examine the cell contraction. Flow cytometry was performed to analyse cell apoptosis. Masson stain, H&E stain and immunochemistry were used to analyse the scar formation in vivo.
Results:
WG449E, as one of the most potent inhibitors, was identified to significantly downregulate the mRNA and protein levels of collagen in hypertrophic scar-derived fibroblasts through inhibiting Smad2/3 phosphorylation. WG449E inhibited the proliferation, migration and contraction of fibroblasts in vitro and in vivo. In addition, WG449E induced cell apoptosis through the activation of cleaved-caspase3. Moreover, WG449E significantly attenuated hypertrophic scar formation and collagen deposition in a mechanical load-induced mouse model.
Conclusions:
WG449E is a potential candidate for the treatment of hypertrophic scars.WG449E downregulates the mRNA and protein levels of collagen in hypertrophic scar-derived fibroblasts through inhibiting Smad2/3 phosphorylation and nucleic localization. WG449E blocks HSF migration and invasion by regulating F-actin assignment. In addition, WG449E induces HSF apoptosis through the activation of cleaved-caspase3.
Insights
A novel compound, WG449E, effectively reduces hypertrophic scar formation by inhibiting collagen production and fibroblast activity. This TGFβ inhibitor shows promise as a potential treatment for excessive scarring.
Area of Science:
- Biomedical research
- Dermatology
- Wound healing research
Background:
- Hypertrophic scars result from abnormal wound healing with excessive fibrosis.
- Current treatments for hypertrophic scars are limited.
- The transforming growth factor β (TGFβ) pathway is crucial in scar development.
Purpose of the Study:
- To investigate the anti-scarring potential of TGFβ inhibitors.
- To evaluate the efficacy of WG449E in vitro and in vivo.
Main Methods:
- Screening compounds targeting type I collagen gene transcription using a luciferase reporter assay.
- Assessing cell proliferation, migration, invasion, and contraction.
- Analyzing protein and mRNA levels via Western blotting, immunofluorescence, and Q-PCR.
- Evaluating scar formation in vivo using histological staining and immunohistochemistry.
Main Results:
- WG449E significantly reduced collagen mRNA and protein levels in fibroblasts by inhibiting Smad2/3 phosphorylation.
- WG449E inhibited fibroblast proliferation, migration, and contraction.
- WG449E induced apoptosis in fibroblasts and attenuated scar formation in a mouse model.
Conclusions:
- WG449E demonstrates potential as a therapeutic agent for hypertrophic scars.
- WG449E acts by downregulating collagen synthesis and inhibiting fibroblast activity.
- WG449E promotes fibroblast apoptosis, contributing to scar reduction.
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