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Letter
Research Support, Non-U.S. Gov't
There is no functional small-fibre neuropathy in prurigo nodularis despite neuroanatomical alterations.
Experimental Dermatology 2017 October
Prurigo nodularis (PN) is a pruritic condition with altered epidermal neuroanatomy as demonstrated previously. Here we elucidated neuroimmunological mechanisms by combining functional, morphological and gene expression experiments in twelve subjects with PN and eight healthy controls. Subjects with PN showed a reduced intra-epidermal nerve fibre density (IENFD) in lesional skin. Quantitative sensory testing indicated maintenance of somatosensory function compared to controls. None of the tested molecular markers including the neuron-distracting SEMA3A and neuron-attracting NGF were altered in lesional vs non-lesional skin in PN subjects. Accordingly, we speculate that scratching may contribute to reduced IENFD rather than an authentic endogenous neuropathy.
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