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Updated: Jun 19, 2025
In Vitro Model of Human Cutaneous Hypertrophic Scarring using Macromolecular Crowding
Published on: May 1, 2020
Decorin attenuates hypertrophic scar fibrosis via TGFβ/Smad signalling
Jiangtao Cui1,2,3,4, Shiyi Zhang1,2,3, Kiran Acharya1,2,3
1Key Laboratory of Shaanxi Province for Craniofacial Precision Medicine Research, College of Stomatology, Xi'an Jiaotong University, Xi'an, Shaanxi, China.
Abstract:
The management of hypertrophic scars (HSs), characterized by excessive collagen production, involves various nonsurgical and surgical interventions. However, the absence of a well-defined molecular mechanism governing hypertrophic scarring has led to less-than-ideal results in clinical antifibrotic treatments. Therefore, our study focused on the role of decorin (DCN) and its regulatory role in the TGF-β/Smad signalling pathway in the development of HSs. In our research, we observed a decrease in DCN expression within hypertrophic scar tissue and its derived cells (HSFc) compared to that in normal tissue. Then, the inhibitory effect of DCN on collagen synthesis was confirmed in Fc and HSFc via the detection of fibrosis markers such as COL-1 and COL-3 after the overexpression and knockdown of DCN. Moreover, functional assessments revealed that DCN suppresses the proliferation, migration and invasion of HSFc. We discovered that DCN significantly inhibits the TGF-β1/Smad3 pathway by suppressing TGF-β1 expression, as well as the formation and phosphorylation of Smad3. This finding suggested that DCN regulates the synthesis of collagen-based extracellular matrix and fibrosis through the TGF-β1/Smad3 pathway.
Insights
Decorin (DCN) is reduced in hypertrophic scars. Restoring DCN inhibits collagen production and fibrosis by regulating the TGF-β1/Smad3 pathway, offering potential new treatments.
Area of Science:
- Biochemistry
- Dermatology
- Molecular Biology
Background:
- Hypertrophic scars (HSs) result from excessive collagen production.
- Current antifibrotic treatments yield suboptimal results due to poorly understood molecular mechanisms.
- Decorin (DCN) is investigated for its role in HS development.
Purpose of the Study:
- To investigate the role of decorin (DCN) in hypertrophic scar (HS) development.
- To elucidate the regulatory function of DCN in the TGF-β/Smad signaling pathway.
Main Methods:
- Compared DCN expression in HS tissue and normal tissue.
- Overexpressed and knocked down DCN in hypertrophic scar-derived cells (HSFc).
- Assessed fibrosis markers (COL-1, COL-3), cell proliferation, migration, and invasion.
- Analyzed the TGF-β1/Smad3 pathway components and phosphorylation.
Main Results:
- DCN expression was decreased in HS tissue and HSFc.
- DCN overexpression inhibited collagen synthesis (COL-1, COL-3), while DCN knockdown increased it.
- DCN suppressed HSFc proliferation, migration, and invasion.
- DCN inhibited the TGF-β1/Smad3 pathway by reducing TGF-β1 expression and Smad3 phosphorylation.
Conclusions:
- Decorin (DCN) plays an inhibitory role in hypertrophic scar formation.
- DCN regulates collagen synthesis and fibrosis via the TGF-β1/Smad3 signaling pathway.
- DCN represents a potential therapeutic target for managing hypertrophic scars.
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