We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Phototoxicity of narrowband ultraviolet ( UV) B (311 nm) compared with broadband UVB in the photo hen's egg test.
- Authors
Bafteh, P.R.; Siegesmund, M.; Kuerten, V.; Neumann, N.J.
- Abstract
Background Broadband ultraviolet B (BB-UVB) is a well-established treatment option in dermatology. However, during the last decade BB-UVB has increasingly been replaced by narrowband UVB 311 nm (NB-UVB), especially in the therapy of psoriasis, atopic eczema and vitiligo. Several studies have indicated a better therapeutic response for almost all indications compared with BB-UVB. Objectives The aim of our study was to investigate the phototoxic effects of NB-UVB in comparison with BB-UVB in vivo. Methods Therefore, we employed the photo hen's egg test (PHET), an established phototoxic model, based on the yolk sac blood vessel system of incubated hen's eggs. NB-UVB and BB-UVB dosages increasing from 30 up to 1200 mJ cm−2 were applied on 17 test groups (each n = 12 eggs) and two unirradiated test groups served as controls. Twenty-four hours after irradiation we observed the following test parameters: lethality, membrane discoloration and haemorrhages. Results Following our results, the lethal half dose (LD50) was 60 and 720 mJ cm−2 for BB-UVB and NB-UVB, respectively. These LD50 dosages provoked severe membrane discoloration and haemorrhaging. Summarizing our results, the LD50 of NB-UVB was 12-fold higher than BB-UVB. Conclusions Interestingly, these findings are in good accordance with the literature, where the minimal erythema dose (MED) of NB-UVB in human skin is up to 14 times higher than the MED of BB-UVB. These results show that the PHET is a valid test model to evaluate the phototoxic effects of various UVB wavelengths. Moreover, our results indicate that regarding the investigation of phototoxic effects the PHET might serve as a model representative for human skin, which might reduce the extent of photoprovocation in humans in the future.
- Subjects
THERAPEUTIC use of ultraviolet radiation; DERMATOLOGY; PSORIASIS treatment; TREATMENT of eczema; VITILIGO; SKIN diseases; THERAPEUTICS
- Publication
British Journal of Dermatology, 2015, Vol 172, Issue 2, p462
- ISSN
0007-0963
- Publication type
Article
- DOI
10.1111/bjd.13221