Abstract:
BACKGROUND:Keratin 14 (K14) is an intermediate filament protein that is mainly expressed in the basal layer of healthy stratified epithelia. K14 has been identified as an autoantigen in the autoimmune-mediated skin disease of Scurfy mice and patients with the "immune dysregulation polyendocrinopathy, enteropathy, and X-linked" syndrome. OBJECTIVES:To examine whether K14 is a target protein in autoimmune skin diseases (ASD), we analyzed the expression pattern of K14 in lesional skin of patients with lichen ruber, cutaneous lupus erythematosus, dermatomyositis, graft-versus-host disease, psoriasis, and pemphigus vulgaris, and evaluated the reactivity of patient sera with recombinantly expressed and epidermis-derived K14. METHODS:K14 expression was analyzed by immunohistochemistry on paraffin-embedded tissue sections of 17 healthy individuals and 58 patients with ASD. Sera from 10 healthy individuals and 41 patients with ASD were analyzed by Western blot for the presence of anti-K14 autoantibodies. RESULTS:In skin of patients with ASD, K14 expression is retained in suprabasal layers. In ASD with interface dermatitis, we observed focal loss of K14 within the basal layer and in hair follicles as well. A scattered dot-like K14 staining is seen in papillary dermis, most prominently in cutaneous lupus erythematosus and lichen ruber. Using Western blot, we show that sera of different patients with ASD recognize recombinantly expressed K14. CONCLUSION:We show focal loss of K14 in the basal epidermis correlating with interface dermatitis and hair follicle involvement. Moreover, enhanced reactivity of sera of patients with atopic dermatitis with K14 suggests K14 may function as an autoantigen in ASD.
journal_name
Int J Dermatoljournal_title
International journal of dermatologyauthors
Wei X,Fricker K,Enk AH,Hadaschik ENdoi
10.1111/ijd.13011subject
Has Abstractpub_date
2016-06-01 00:00:00pages
620-8issue
6eissn
0011-9059issn
1365-4632journal_volume
55pub_type
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journal_title:International journal of dermatology
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