Functional significance of non-neuronal acetylcholine in skin epithelia

Anisa Hana, Dirk Booken, Carmen Henrich, Alexei Gratchev, Nicole Maas-Szabowski, Sergij Goerdt, Hjalmar Kurzen

Research output: Contribution to journalArticlepeer-review

83 Scopus citations

Abstract

In recent years, the physiological role of non-neuronal acetylcholine (ACh) and its receptors (AChR) in epidermal physiology has been under intense investigation. However, little is known about the role of the non-neuronal cholinergic system in inflammatory skin diseases. We chose the clinically nicotine-dependent skin disease hidradenitis suppurativa (HS) as model to study the influence of long term nicotine ingestion on epidermal morphology and AChR expression. HS is a chronic inflammatory, disabling disease of unknown pathogenesis emerging from the pilosebaceous unit of the intertriginous areas. In order to correlate our findings to specific nicotine effects, we used the organotypical coculture system (OTC) and raised artificial epidermis in the presence of nicotine. After 12 days in culture control OTC showed a mature epithelium, while nicotine treated OTCs were significantly thicker. Using immunofluorescence analysis, nicotine treated OTCs produced significantly stronger immunoreactivity (IR) for the α3, M3 and M5 AChR antisera than control. In contrast, the α7 nAChR antiserum showed a slightly reduced IR in the granular layer and the α9 nAChR IR retracted to the lower suprabasal layers. In HS epidermis we found the strongest IR for all AChR around the follicular infundibulum while in the sinus epithelia it was only weak. In contrast to the nicotine treated OTC, the α7 nAChR IR in the hyperplastic HS epidermis was clearly extended to all living layers. Altogether we provide first hints for a causative role of the non-neuronal cholinergic system in the pathogenesis of HS by promoting infundibular epithelial hyperplasia and thus follicular plugging.

Original languageEnglish
Pages (from-to)2214-2220
Number of pages7
JournalLife Sciences
Volume80
Issue number24-25
DOIs
StatePublished - 30 May 2007
Externally publishedYes

Keywords

  • Acetylcholine
  • Acne inversa
  • Epidermis equivalent
  • Hidradenitis
  • Smoking

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