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UV-induced skin damage
M Ichihashi1, M Ueda, A Budiyanto
1Division of Dermatology, Graduate School of Medicine, Translational Medicine, School of Medicine, Kobe University, Kobe, Japan. ichihash@med.kobe.ac.jp
Toxicology
|June 25, 2003
Summary
Solar radiation, especially ultraviolet B, causes skin damage and cancer by mutating DNA. Antioxidants show promise in preventing UV-induced skin cancer.
Area of Science:
- Dermatology
- Molecular Biology
- Cancer Research
Background:
- Solar radiation, particularly ultraviolet B (UVB), is a known carcinogen.
- Chronic UV exposure leads to skin aging and increases the risk of skin tumors, including melanoma.
- UV radiation can cause DNA damage and immunosuppression, contributing to skin cancer development.
Purpose of the Study:
- To review recent understanding of DNA damage and repair mechanisms induced by solar UV radiation.
- To discuss mutations in key genes (p53, ras, patched) associated with UV-induced non-melanoma skin cancer.
- To explore the role of reactive oxygen species (ROS) in UV carcinogenesis and apoptosis, and the potential of antioxidants for prevention.
Main Methods:
- Review of recent scientific literature (primarily from the last decade) on UV radiation effects on skin.
- Analysis of studies on direct and indirect DNA damage (ROS-mediated) by UV.
- Examination of DNA repair mechanisms, focusing on nucleotide excision repair.
- Investigation of UV-induced mutations in specific genes and their role in skin cancer.
- Discussion of UV's impact on skin immunity and potential preventative strategies using antioxidants.
Main Results:
- UVB is more mutagenic and carcinogenic than UVA in animal models.
- UV radiation causes DNA damage directly and indirectly via reactive oxygen species (ROS).
- Key genes like p53, ras, and patched are frequently mutated in UV-induced skin cancers.
- ROS can promote UV carcinogenesis while also inducing programmed cell death (apoptosis).
- UV radiation can suppress the skin's immune response.
Conclusions:
- UV radiation poses a significant risk for skin cancer through DNA damage, mutations, and immunosuppression.
- Understanding DNA repair pathways is crucial for comprehending UV carcinogenesis.
- Antioxidants, including polyphenols, vitamin C, and vitamin E, may offer a protective strategy against UV-induced skin damage and cancer.
- Further research into antioxidant efficacy and mechanisms is warranted for clinical application.