A putative antipruritic mechanism of the phosphodiesterase-4 inhibitor E6005 by attenuating capsaicin-induced depolarization of C-fibre nerves

E6005, a potent, selective phosphodiesterase (PDE) 4 inhibitor, has been developed as a novel topical agent of atopic dermatitis (AD). It has been shown to inhibit itching in patients with AD as well in mouse models. To study the mechanism underlying the anti‐pruritic effect of E6005, we examined it...

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Bibliographic Details
Published in:Experimental dermatology 2015-03, Vol.24 (3), p.215-216
Main Authors: Wakita, Hisashi, Ohkuro, Masayoshi, Ishii, Naoto, Hishinuma, Ieharu, Shirato, Manabu
Format: Article
Language:English
Subjects:
Action Potentials - drug effects
Animals
antipruritic effect
Antipruritics - pharmacology
C-fibre nerve
cAMP
Capsaicin - antagonists & inhibitors
Cyclic AMP - metabolism
Ganglia, Spinal
Male
Nerve Fibers - drug effects
Nerve Fibers - physiology
phosphodiesterase 4
Phosphodiesterase 4 Inhibitors - pharmacology
Phthalic Acids - pharmacology
Quinazolines - pharmacology
Rats
Rats, Wistar
TRPV Cation Channels - metabolism
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Summary:E6005, a potent, selective phosphodiesterase (PDE) 4 inhibitor, has been developed as a novel topical agent of atopic dermatitis (AD). It has been shown to inhibit itching in patients with AD as well in mouse models. To study the mechanism underlying the anti‐pruritic effect of E6005, we examined its effect on the activation of dorsal root ganglion (DRG) neurons associated with the itch sensation. Depolarization of DRG neurons by a transient receptor potential vanilloid 1 (TRPV 1) activator, capsaicin was attenuated by E6005 as well as by a 3′,5′‐cyclic adenosine monophosphate (cAMP) elevator, forskolin. E6005 elevated intracellular levels of cAMP in DRG cells. Taken together, these results suggest that E6005 suppresses TRPV1‐mediated C‐fibre depolarization through elevation of cAMP levels, thereby exerting an anti‐pruritic effect. Thus, E6005 shows the potential to be a new agent for managing pruritus in various skin disorders, including AD.
ISSN:0906-6705
1600-0625
DOI:10.1111/exd.12606