The pilosebaceous unit is part of the skin immune system

Dermatology : International Journal for Clinical and Investigative Dermatology
M Böhm, T A Luger

Abstract

It is well established that the functional state of sebaceous glands in vivo is a tightly regulated process orchestrated through the interaction of male sex hormones and functional androgen receptors expressed on sebocytes. In the last few years, however, it has become increasingly apparent that sebocytes like epidermal keratinocytes express a variety of cytokines which are implicated in inflammatory and immune responses. For example, sebocytes in vivo have been found to highly express tumor necrosis factor alpha (TNF-alpha) as determined by immunohistochemical and electron-microscopic methods. Moreover, certain neuropeptides including vascular intestinal peptide and proopiomelanocortin (POMC) peptides as well as their receptors have been localized within the pilosebaceous unit of murine and human skin. Since POMC peptides such as alpha-melanocyte-stimulating hormone have recently been shown to exert important immunoregulatory effects by antagonizing the function of proinflammatory cytokines (e.g interleukin 1, interleukin 6 and TNF-alpha), induction of immunosuppressive cytokines (like interleukin 10), modulation of costimulatory molecule expression (e.g. B7-2) or suppression of macrophage-derived nitric oxide, complex interac...Continue Reading

Citations

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