Abstract
A previous study in the hairless mouse, in which the photoimmune protective properties of a topical phytoestrogen or17-ß-estradiol were abrogated by the estrogen receptor antagonist ICI 182,780, revealed that estrogen receptor (Er) signaling is involved in the regulation of the suppression of immune function by UVB (290-320 nm) radiation. Here we identify the expression of Er-ß but not Er-a mRNA in hairless mouse skin, whereas Er-a and Er-ß mRNA were present in normal haired mouse skin. This suggests that the non-classical estrogen target Er-ß is involved in the photoimmune modulation, and is consistent with Er-a being more closely associated with hair growth control, as indicated by other studies. In mice with a null mutation for Er-ß, there was a significant exacerbation of the solar simulated UV (290-400 nm)-induced suppression of contact hypersensitivity. Immunohistochemical analysis revealed that the Er-ß deficiency inhibited the normally immunoprotective upregulation by the UVA (320-400 nm) waveband of the epidermal expression of the cytokines IFN-λ and IL-12. Er-ß deficiency also significantly increased the UVB-induced expression of the immunosuppressive cytokine IL-10. Thus Er signalling via the Er-ß is evidently a major regulator of the UVA and UVB waveband interactions that determine the skin’s immune functional status, and achieves this by normalization of the cutaneous cytokine array in the UV-irradiated skin.
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Cho, JL., Allanson, M., Domanski, D. et al. Estrogen receptor-beta signaling protects epidermal cytokine expression and immune function from UVB-induced impairment in mice. Photochem Photobiol Sci 7, 120–125 (2008). https://doi.org/10.1039/b709856a
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DOI: https://doi.org/10.1039/b709856a