Summary
There is conflicting evidence in the literature as to whether cutaneous nerves are altered in psoriasis or not. In this study, antibodies to protein gene product (PGP) 9.5 were used to visualize cutaneous nerves in biopsies from involved and uninvolved skin of nine patients with psoriasis and from normal skin of eight healthy controls. A profound reduction in the epidermal nerve fibre density was observed in the involved psoriatic skin. These intraepidermal nerve fibres were also mostly short and found in the basal layer. Only a few nerve fibres were found in the suprabasal layer and they were non-varicose, long fibres going straight up without branching. In the uninvolved skin of psoriatic patients, the distribution and number of the intraepidermal nerve fibres was similar to that observed in normal skin. In the dermis, the distribution and the number of the nerve fibres showed no differences between involved psoriatic skin, uninvolved psoriatic skin, and normal skin. The results support previous studies in which alterations of cutaneous nerves in psoriasis have been described.
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Johansson, O., Han, S.W. & Enhamre, A. Altered cutaneous innervation in psoriatic skin as revealed by PGP 9.5 immunohistochemistry. Arch Dermatol Res 283, 519–523 (1991). https://doi.org/10.1007/BF00371926
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DOI: https://doi.org/10.1007/BF00371926