title: Interleukin-8-positive neutrophils in psoriasis.
abstract: We performed an immunohistochemical study to try to determine the cellular source of interleukin-8 (IL-8) in psoriatic skin lesions. IL-8 was positively stained in the vast majority of neutrophils but not in the mononuclear cells, macrophages, or keratinocytes. IL-8-positive neutrophils were seen both in Munro's microabcesses in cases of psoriasis vulgaris and in a small spongiform pustule and much larger macropustules of Kogoj in cases of pustular psoriasis. Some IL-8-positive neutrophils were observed in the upper dermis of pustular psoriasis. The staining was considered to be specific because it could be completely blocked by preabsorption with recombinant IL-8. In addition, stimulation of human neutrophils with lipopolysaccharide (LPS) or tumor necrosis factor-alpha (TNF-alpha) for 18 h induced IL-8 production in vitro. In our study, IL-8 was expressed in the neutrophils of psoriasis, suggesting that neutrophils are one of the sources of IL-8 in psoriasis. The expression of IL-8 and the influx of neutrophils led us to speculate that the IL-8 autocrine and/or paracrine system functions in the formation of the microabcesses and pustules in proriasis.
authors.affiliation: Department of Dermatology, Graduate School of Medical Sciences, Kyushu University, 3-1-1, Maidashi, Higashi-ku, J-812-8582, Fukuoka, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Duan
authors.forename: T
authors.initials: T
authors.lastname: Koga
authors.forename: F
authors.initials: F
authors.lastname: Kohda
authors.forename: H
authors.initials: H
authors.lastname: Hara
authors.forename: K
authors.initials: K
authors.lastname: Urabe
authors.forename: M
authors.initials: M
authors.lastname: Furue
mesh_terms: D006801:Humans; D007150:Immunohistochemistry; D066298:In Vitro Techniques; D016209:Interleukin-8 / Q000378:metabolism*; D008070:Lipopolysaccharides / Q000494:pharmacology; D009504:Neutrophils / Q000187:drug effects / Q000276:immunology*; D011565:Psoriasis / Q000276:immunology* / Q000473:pathology; D014409:Tumor Necrosis Factor-alpha / Q000494:pharmacology
chemical_list: D016209:Interleukin-8; D008070:Lipopolysaccharides; D014409:Tumor Necrosis Factor-alpha