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Tyrosinase gene expression is regulated by p53.
Mary K Khlgatian1, Ina M Hadshiew, Pravit Asawanonda
1Department of Dermatology, Boston University School of Medicine, Boston, Massachusetts 02118, USA.
The Journal of Investigative Dermatology
|February 20, 2002
Summary
The tumor suppressor p53 protein, activated by DNA damage, increases tyrosinase gene expression, leading to skin tanning. This indicates tanning is a protective response mediated by p53.
Area of Science:
- Molecular Biology
- Dermatology
- Genetics
Background:
- Tyrosinase is key in melanin production and skin tanning.
- Ultraviolet (UV) irradiation and DNA damage activate p53.
- The role of p53 in UV-induced tyrosinase expression is unclear.
Purpose of the Study:
- To investigate if p53 activation is necessary for increased tyrosinase expression after DNA damage.
- To determine the role of p53 in UV-induced skin tanning.
Main Methods:
- Used human melanoma cells with wild-type and dominant-negative p53.
- Utilized p53 knockout and wild-type mice.
- Measured tyrosinase mRNA levels and epidermal melanin content.
Main Results:
- p53 activation upregulated tyrosinase mRNA and increased pigmentation in mice.
- Dominant-negative p53 cells showed no tyrosinase upregulation after UV or DNA damage.
- p53 knockout mice did not show increased melanin after DNA damage.
Conclusions:
- p53 activation is required for increased tyrosinase expression and subsequent skin pigmentation.
- Skin tanning is an adaptive, p53-mediated response to DNA damage.
- p53 plays a crucial role in the skin's photoprotective mechanisms.