The development of manifest psoriatic lesions is linked with the invasion of CD8 + T cells and CD11c + macrophages into the epidermis.
Koebner response was studied in 35 psoriatic patients. Two punch biopsies per patient were taken from non-lesional psoriatic skin before, and 6 h, 2 days, 7 days, 14 days and 21 days after, tape stripping. Alterations in the numbers of CD1+ Langerhans cells, CD4+ and CD8+ T cells and CD11c+ macrophages were mapped morphometrically. Results were compared with lesional and non-lesional psoriatic skin, and control skin. Nine of 35 patients were Koebner-positive. No statistically significant differences were noted between non-lesional psoriatic and control skin. CD4+ T cells increased in number 2 days after trauma in both the epidermis and the dermis, whereas epidermal CD8+ T cells and CD11c+ macrophages increased only in the Koebner-positive lesional skin after 7 days. The changes in lesions induced by tape-stripping resembled those seen in lesional psoriatic skin (mature plaques). The number of CD1+ cells increased in mature psoriatic lesions only. It seems possible that trauma per se stimulates the accumulation of CD4+ T cells at the site of injury, but the development of manifest psoriatic lesions correlates with invasion of CD8+ T cells and CD11c+ macrophages into the epidermis.
Paukkonen
K
K
Department of Dermatology, Kuopio University Hospital, Finland.
Naukkarinen
A
A
Horsmanheimo
M
M
D000328:Adult; D000368:Aged; D015703:Antigens, CD / Q000097:blood*; D018845:CD11 Antigens; D004817:Epidermis / Q000276:immunology*; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D007249:Inflammation / Q000209:etiology / Q000276:immunology / Q000473:pathology; D008264:Macrophages / Q000276:immunology*; D008297:Male; D008875:Middle Aged; D011565:Psoriasis / Q000150:complications / Q000276:immunology* / Q000473:pathology; D011897:Random Allocation; D050378:T-Lymphocytes, Regulatory / Q000276:immunology*
D015703:Antigens, CD; D018845:CD11 Antigens