Toll-Like Receptor-Mediated Upregulation of CXCL16 in Psoriasis Orchestrates 
Neutrophil Activation

Steffen, Sabine; Abraham, Susanne; Herbig, Maik; Schmidt, Franziska; Blau, Kristin; Meisterfeld, Susann; Beissert, Stefan; Guck, Jochen; Guenther, Claudia

doi:10.1016/j.jid.2017.08.041

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Toll-Like Receptor-Mediated Upregulation of CXCL16 in Psoriasis Orchestrates Neutrophil Activation

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Steffen, S., Abraham, S., Herbig, M., Schmidt, F., Blau, K., Meisterfeld, S., et al. (2018). Toll-Like Receptor-Mediated Upregulation of CXCL16 in Psoriasis Orchestrates Neutrophil Activation. JOURNAL OF INVESTIGATIVE DERMATOLOGY, 138(2), 344-354. doi:10.1016/j.jid.2017.08.041.

Cite as: https://hdl.handle.net/21.11116/0000-0004-AF3B-6

Abstract

Innate immune processes are central in the development of the chronic inflammatory skin disease psoriasis. Studying stimulation of keratinocytes, monocytes, and dendritic cells by type I interferons or ligation of Tolllike receptors 1/2, 2/6, or 7, but not 7/8, resulted in enhanced surface expression and secretion of CXC chemokine ligand (CXCL) 16. The corresponding CXC chemokine receptor 6 was expressed on neutrophils whose recruitment into skin is important, especially in early psoriatic disease. Using the recently developed technique real-time deformability cytometry demonstrated that CXCL16 and IL-8 decreased the stiffness and enhanced deformation of neutrophils facilitating transmigration through vessel wall. In addition, CXCL16 potently induced migration of neutrophils and enhanced the chemotactic effect of IL-8. The positive feedback loop was supported by IL-8 enhancing CXCL16 production of neutrophils. Blocking of CXCL16 expression by effective treatment of psoriasis patients with tumor necrosis factor-alpha blockers further supported the pathogenic role of this chemokine. In summary, the data link innate immune stimulation to CXCL16 upregulation and neutrophil infiltration into skin. CXCL16 could therefore represent a potent future target for treatment of psoriasis.