Cleavage of desmoglein 3 can explain its depletion from keratinocytes in pemphigus vulgaris.

Abstract:

: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.

journal_name

Exp Dermatol

journal_title

Experimental dermatology

authors

Cirillo N,Campisi G,Gombos F,Perillo L,Femiano F,Lanza A

doi

10.1111/j.1600-0625.2008.00719.x

subject

Has Abstract

pub_date

2008-10-01 00:00:00

pages

858-63

issue

10

eissn

0906-6705

issn

1600-0625

pii

EXD719

journal_volume

17

pub_type

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