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Comparative Study
Journal Article
Deposition of C3, C9 neoantigen and vitronectin (S-protein of complement) in lichen planus pemphigoides.
British Journal of Dermatology 1990 July
We have compared the distribution of C3, C9 neoantigen (C9n) and vitronectin at the dermoepidermal junction in lichen planus pemphigoides with that in bullous pemphigoid. Eight out of 30 biopsies from patients with lichenoid lesions had linear C3 deposition at the basement membrane zone (BMZ); four of these patients had bullae and fulfilled the criteria for lichen planus pemphigoides. C9n immunoreactivity was detected as a linear or an intermittent linear/granular band at the BMZ only in these four patients, suggesting a role for the membrane attack complex of complement (MAC) in the pathogenesis of blister formation in lichen planus pemphigoides. Faint linear deposition of vitronectin, in addition to C9n, at the BMZ was seen in two of the four cases of lichen planus pemphigoides and three of six cases of bullous pemphigoid. This suggests that vitronectin may be deposited in association with C9n not only as part of the non-lytic SC5b-9 complex, but also as a regulatory step following the lytic action of MAC. A regulatory function for vitronectin in limiting tissue damage following activation of MAC is supported by our finding of a heavy deposition of vitronectin in association with C9n in a lichen planus pemphigoides patient in whom bulla formation had ceased.
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