Wavelength
The wavelength 370 nm hat some decisive advantages for dermatology. UV-damaged DNA is a basic molecular target structure of UV-mediated immunosuppression. These effects can be used selectively for the therapy of diverse types of dermatosis in which the cellular immunity has been disrupted. The external stimulation can induce a normalization of the immune answer of the skin. UVA (315 - 400 nm) has a deeper penetration into the skin, as compared to UVB (280 - 315 nm). UVA can reach into the dermis.
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The immune suppressive effects of UV radiation on the immune system have important biological and clinical relevance, as they contribute to photocarcinogenesis: - They inhibit the presentation of antigens.
- They stimulate the release of immune-suppressive zytokins.
- They induce regulatory t-lymphocytes.
UVA radiation has a lower risk of side effects than UVB: The absorption of UVB by DNA is high, which can lead to damage. This in turn increases the risk of cancerogenesis.
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