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• W2019298839 abstract "Summary Background Linear IgA disease (LAD) is an IgA‐mediated subepidermal immunobullous disease of adults and children, with heterogeneous immunopathology. Objectives To investigate to what extent the cellular origins of the target antigens account for the heterogeneity of the immune response in LAD. Methods Forty‐nine adult and 33 childhood LAD sera were studied. Immunofluorescence was carried out to determine the expression of the LAD antigens by normal human keratinocytes, fibroblasts and mixed cultures of keratinocytes and fibroblasts. Immunoblotting was performed to determine the localization of the LAD target antigens in tissue extracts (48 adult and 31 childhood sera) and cell extracts (21 adult and 10 childhood sera). Results Thirty‐one adult and 13 childhood LAD sera bound proteins expressed by human keratinocytes; of these sera, 15 adult and four childhood LAD sera also recognized proteins expressed by fibroblasts. A single adult serum was positive on fibroblasts alone. Seventeen adult and 20 childhood sera were negative on both cell types. There was a modest increase (9%) in the detection of the IgA autoantibodies on keratinocytes and fibroblasts grown together in mixed culture. Immunoblotting showed that the LAD target antigens could be detected in cell as well as in tissue extracts. Conclusions Our results have shown that normal human keratinocytes and fibroblasts in culture express the LAD target antigens. LAD sera (with a single exception) bound antigens expressed by keratinocytes alone or by both keratinocytes and fibroblasts. The principal pattern of expression in keratinocytes was cytoplasmic, similar to that demonstrated by polyclonal antibodies to the 180‐kDa bullous pemphigoid antigen (BP180). This reflects the pivotal role of BP180 in LAD. The finding that LAD antigens are expressed by both human keratinocytes and fibroblasts in culture may explain the heterogeneity of the target antigens, and may be a contributory factor in the immunopathology of the disease." @default.
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• W2019298839 date "2003-05-01" @default.
• W2019298839 modified "2023-09-25" @default.
• W2019298839 title "The cellular origins of the linear IgA disease target antigens: an indirect immunofluorescence study using cultured human keratinocytes and fibroblasts" @default.
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• W2019298839 doi "https://doi.org/10.1046/j.1365-2133.2003.05313.x" @default.
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