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Establishment and Validation of a C57BL/6J Mouse Model for Melasma
Wenzhu Wang1, Xiaojie Sun1, Yunyao Liu2
1Department of Laser, Hospital for Skin Diseases, Institute of Dermatology, Chinese Academy of Medical Sciences & Peking Union Medical College, Nanjing, China.
Cell Proliferation
|July 10, 2025
Summary
Researchers developed a novel mouse model for melasma, a complex skin hyperpigmentation disorder. This reproducible model mimics human melasma symptoms and treatment responses, aiding future research into its causes and therapies.
Area of Science:
- Dermatology
- Animal Models
- Hyperpigmentation Disorders
Background:
- Melasma is a common, recurrent skin hyperpigmentation with complex causes.
- Existing animal models are insufficient for studying melasma pathogenesis and treatment.
- Lack of reliable models hinders understanding of melasma onset and progression.
Purpose of the Study:
- To establish a stable and clinically relevant mouse model for melasma.
- To investigate the pathogenesis of melasma using the developed model.
- To provide a platform for testing potential melasma treatments.
Main Methods:
- Developed a melasma-like model in C57BL/6J mice using UVB irradiation, progesterone, and emotional stress.
- Analyzed skin histopathology, melanin content, tyrosinase levels, oxidative stress, and autophagy.
- Compared the model to UV-induced post-inflammatory hyperpigmentation (PIH) models.
- Assessed response to tranexamic acid treatment.
Main Results:
- The model exhibited irregular, brown hyperpigmented patches with melanin accumulation.
- Elevated tyrosinase (TYR) and oxidative stress were observed, alongside reduced autophagy.
- The model showed distinct characteristics compared to UV-induced PIH.
- Tranexamic acid treatment in the model mirrored clinical outcomes in human melasma patients.
Conclusions:
- A stable, reproducible, and clinically relevant mouse model for melasma has been established.
- This model facilitates further research into melasma pathogenesis.
- The model serves as a valuable tool for evaluating melasma treatments and understanding disease mechanisms.
