Abstract:Exposure to ultraviolet radiation (UVR) in sunlight activates both defensive and repair pathways in the skin. As the major cell type affected by UVR, keratinocytes coordinate critical aspects of the skin response. Molecularly, the transcription factor p53 is induced by UVR in keratinocytes leading to their cell death by apoptosis (peeling). p53 also stimulates the expression of paracrine melanocyte growth factors involved in tanning defined as increase in melanocyte proliferation and melanin synthesis. Here, w… Show more
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