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Cleavage of desmoglein 3 can explain its depletion from keratinocytes in pemphigus vulgaris
Author(s) -
Cirillo Nicola,
Campisi Giuseppina,
Gombos Fernando,
Perillo Letizia,
Femiano Felice,
Lanza Alessandro
Publication year - 2008
Publication title -
experimental dermatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.108
H-Index - 96
eISSN - 1600-0625
pISSN - 0906-6705
DOI - 10.1111/j.1600-0625.2008.00719.x
Subject(s) - pemphigus vulgaris , desmoglein 3 , desmoglein 1 , keratinocyte , dermatology , desmoglein , cleavage (geology) , medicine , chemistry , immunology , biology , biochemistry , autoantibody , antibody , paleontology , fracture (geology) , in vitro
We have previously demonstrated that serum of patients with pemphigus vulgaris induces reduction of desmoglein 3 (Dsg3) half‐life in keratinocytes (FEBS Lett 2006: 580: 3276). This phenomenon seems to occur as a consequence of the progressive depletion of Dsg3 from desmosomes. Here we reported that reduction of full‐length Dsg3 may be due to its progressive cleavage, leading to the formation of two fragmentation products with apparent molecular masses of about 60 kDa (fragment 1) and 70 kDa (fragment 2), as revealed by Western blotting. Unexpectedly, analysis of fragmentation pattern suggested cleavage to occur intracellularly. Consistently, fragment 1 was shed and localized within the cytosol, as shown by living cell immunofluorescence microscopy. Total amounts of full‐length plakoglobin and Dsg1 were apparently unchanged. Taken together, our findings provide evidence that proteolytic processing of Dsg3 can lead to depletion of Dsg3 from the cell.