Tumour necrosis factor alpha is pro-inflammatory in normal human skin and modulates cutaneous adhesion molecule expression

The British Journal of Dermatology
R W GrovesD M MacDonald

Abstract

Tumour necrosis factor alpha (TNF-alpha) is a potent immunoregulatory cytokine produced by many cutaneous cells, including keratinocytes, mast cells and Langerhans cells. To explore its potential role in inflammatory skin disease, we have studied immunohistochemically the effects of intradermal recombinant human TNF-alpha (rHuTNF-alpha) on cutaneous inflammatory cells, adhesion molecules and Langerhans cells in normal human skin. Volunteers receive rHuTNF-alpha 100 U (group A), 5000 U (group B), or 100 U daily for 5 days (group C), and biopsies were taken at 6 h (groups A and B), or 6 h after the final injection (group C). An inflammatory cell infiltrate developed in all cases: following single injections of either 100 or 5000 U rHuTNF-alpha this was predominantly neutrophilic, whereas following multiple injections of 100 U few neutrophils were seen, although many lymphocytes (CD3+, CD4+) were present. In all groups there was an increase in cells of monocyte/macrophage lineage (CD36+). TNF-alpha induced a dose- and time-dependent decrease in CD1a+ epidermal Langerhans cell numbers and an increase in dermal CD1a+ cells, suggesting migration of Langerhans cells away from the epidermis. TNF-alpha induced endothelial E-selectin, in...Continue Reading

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