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Neurotropin inhibits the increase in intraepidermal nerve density in the acetone‐treated dry‐skin mouse model
Author(s) -
Kamo A.,
Tominaga M.,
Taneda K.,
Ogawa H.,
Takamori K.
Publication year - 2013
Publication title -
clinical and experimental dermatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.587
H-Index - 78
eISSN - 1365-2230
pISSN - 0307-6938
DOI - 10.1111/ced.12100
Subject(s) - medicine , family medicine , dermatology
Summary Epidermal hyperinnervation is considered one cause of sensitization to itch, and is thought to regulated by keratinocyte‐derived axonal guidance molecules, including nerve growth factor ( NGF ) and semaphorin (Sema)3A. Neurotropin ( NTP ) shows antipruritic effects in allergic disease and is also used for pain relief. Using cultured rat dorsal root ganglion neurones, we previously found that NTP inhibited NGF ‐induced neurite outgrowth. However, no such inhibitory effect has been shown in vivo . We therefore assessed the effects of intraperitoneal administration of NTP on nerve density and expression of NGF and Sema3A mRNA s in the epidermis of acetone‐treated mice showing epidermal hyperinnervation. We found that NTP significantly reduced intraepidermal nerve growth in these acetone‐treated mice. NTP significantly upregulated epidermal Sema3A mRNA , but had no effect on expression of epidermal NGF mRNA . These findings indicate that NTP may reduce intraepidermal nerve density by inducing expression of Sema3A in the epidermis.