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Updated: Feb 20, 2026
A Mouse Model of Mechanotransduction-driven, Human-like Hypertrophic Scarring
Published on: November 29, 2024
A novel model of humanised keloid scarring in mice
Tao Shang1,2, Bin Yao2, Dongyun Gao2
1Institute of Basic Medical Sciences, General Hospital of PLA, Beijing, P.R. China.
Abstract:
Treatments for keloid scarring are a major challenge to scientists and physicians for their unknown aetiology. Although several models, including monolayer cell culture to tissue-engineered models, were developed, further research on keloid has more or less been hindered by the lack of appropriate animal models. Because these aberrant scars are specific to humans, we obtained human normal and keloid skin tissues and isolated dermal fibroblasts from them. Cell morphology, growth and immunohistochemical staining of myofibroblastmarker α-SMA were examined, and the cell medium of 2-hour culture and 24-hour culture was implanted on the back of nude mice. The cell medium of 2-hour culture and 24-hour culture was also analysed by a protein array for the detection of distinction in inflammatory factors. We showed that keloid fibroblasts had similar morphology and growth compared to normal skin fibroblasts, but the α-SMA expression was obviously up-regulated. After 6 weeks, mice of the 2-hour keloid-derived culture medium group exhibited keloid-like hypertrophic nodules macroscopically, while mice of 24-hour keloid-derived culture medium group were similar to normal skin. Histological findings confirmed that the reconstituted skin tissues had the typical features of human keloids. The protein array data revealed that RANTES were involved in humanised fibrotic occurrence in mice, also suggesting they were important modulators of this inflammatory event. This novel model might help to understand the key events that result in the formation of these abnormal scars and provide new therapeutic options.
Insights
Developing a new animal model for keloid scarring, this study found that keloid fibroblasts upregulate alpha-smooth muscle actin (α-SMA). This model successfully replicated human keloid features in mice, aiding research into fibrotic scar formation.
Area of Science:
- Dermatology and Regenerative Medicine
- Fibrosis Research
- Animal Modeling for Human Diseases
Background:
- Keloid scarring presents a significant challenge due to unknown etiology and lack of suitable animal models.
- Existing models like cell cultures and tissue engineering have limitations in fully recapitulating keloid development.
- Aberrant scarring, specifically keloids, is a human-specific condition, necessitating novel modeling approaches.
Purpose of the Study:
- To develop and validate a novel animal model for studying keloid scarring.
- To investigate the role of dermal fibroblasts and inflammatory factors in keloid formation.
- To identify potential therapeutic targets for keloid treatment.
Main Methods:
- Isolation and characterization of human normal and keloid dermal fibroblasts.
- Immunohistochemical staining for alpha-smooth muscle actin (α-SMA).
- Implantation of cell culture media onto nude mice and subsequent analysis of nodule formation, histology, and protein arrays for inflammatory factors.
Main Results:
- Keloid fibroblasts showed similar morphology and growth but significantly upregulated α-SMA expression compared to normal fibroblasts.
- Mice implanted with 2-hour keloid-derived medium developed keloid-like hypertrophic nodules, confirmed by histology.
- Protein array analysis identified RANTES as a key inflammatory factor involved in fibrotic occurrence.
Conclusions:
- A novel humanized mouse model for keloid scarring has been established using keloid fibroblast-derived media.
- The model demonstrates the potential to study keloid pathogenesis and evaluate therapeutic strategies.
- RANTES is implicated as a crucial modulator in the inflammatory events leading to humanized fibrotic scarring.
