Abstract:
:Pemphigus vulgaris (PV) and pemphigus foliaceus (PF) are autoimmune blistering diseases characterized by a loss of cell-cell adhesion and by autoantibodies directed against epidermal cadherins. PF antigen has been established as desmoglein I which is located strictly on the desmosome, whereas the precise ultrastructural localization of PV antigen remains unclear and controversial to date. To further investigate this question, we compared the location of immune deposits in 14 patients with PV and 10 patients with PF by both direct and indirect immunoelectron microscopy (IEM). Inclusion criteria were based upon clinical features, histological level of cleavage and characterization of circulating antibodies by Western blot on epithelial bovine tongue extracts. IEM was performed on unfixed 0.7-mm slices of skin for the direct technique or on normal skin for the indirect technique using peroxidase labelling. In PF, by both direct and indirect IEM, immune deposits were located on the extracellular part of desmosomes (desmoglea) in all the samples studied. In PV, by both direct and indirect IEM, deposits were situated on the desmoglea and along large portions of the keratinocyte membrane without desmosomal structures in 15 of the 18 samples studied and only on the desmoglea in 3 samples. These results suggest that, in contrast to PF, the target antigen in PV is not always restricted to desmosomes. As various types of adherens junctions have been reported to mediate cell adhesion in the epidermis, the PV antigen could be a component of desmosomes and of other focal adhesions.
journal_name
Arch Dermatol Resjournal_title
Archives of dermatological researchauthors
Bédane C,Prost C,Thomine E,Intrator L,Joly P,Caux F,Blecker M,Bernard P,Leboutet MJ,Tron F,Lauret P,Bonnetblanc JM,Dubertret Ldoi
10.1007/BF02507101subject
Has Abstractpub_date
1996-06-01 00:00:00pages
343-52issue
7eissn
0340-3696issn
1432-069Xjournal_volume
288pub_type
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