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Relationship between ultraviolet radiation-induced immunosuppression and carcinogenesis
J W Streilein1, J R Taylor, V Vincek
1Schepens Eye Research Institute, Boston, Massachusetts 02114.
The Journal of Investigative Dermatology
|November 1, 1994
Summary
Ultraviolet B (UVB) radiation damages the skin immune system, impairing immune responses and inducing tolerance. Genetic factors influence susceptibility to UVB effects, potentially increasing skin cancer risk.
Area of Science:
- Immunology
- Dermatology
- Photobiology
Background:
- Ultraviolet B (UVB) radiation's capacity to impair the cutaneous immune system is well-established.
- UVB-induced immune damage is considered a critical factor in sunlight-induced skin cancer development.
- Acute, low-dose UVB exposure, mimicking typical sun exposure, affects the immune system by impairing contact hypersensitivity and inducing tolerance.
Purpose of the Study:
- To summarize evidence on UVB radiation's effects on the cutaneous immune system.
- To explore the immunogenetic factors influencing UVB susceptibility and resistance.
- To advance a hypothesis for the mechanism of UVB-induced immune suppression and its link to skin cancer.
Main Methods:
- Review of existing evidence on UVB radiation's effects on immune responses.
- Analysis of immunogenetic factors, including specific genetic loci (tumor necrosis factor-alpha, lipopolysaccharide).
- Comparison of UVB effects in mice and humans, including contact hypersensitivity induction and tolerance.
Main Results:
- UVB radiation impairs contact hypersensitivity induction and induces antigen-specific tolerance.
- Immunogenetic factors in mice dictate susceptibility to UVB's effects on contact hypersensitivity.
- UVB-susceptibility and resistance traits are observed in humans, suggesting similar genetic control.
Conclusions:
- UVB-dependent transformation of urocanic acid in the epidermis may trigger tumor necrosis factor-alpha release, immobilizing antigen-presenting cells and preventing immune responses.
- Genetic factors likely control UVB susceptibility and resistance in humans, contributing to skin cancer risk.
- The mechanisms of UVB-induced tolerance involve different genetic factors and may also contribute to skin cancer development.
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