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J. Biol. Chem., Vol. 281, Issue 11, 7623-7634, March 17, 2006

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Desmoglein Endocytosis and Desmosome Disassembly Are Coordinated Responses to Pemphigus Autoantibodies^*

Cathárine C. Calkins¹, Shannon V. Setzer¹², Jean Marie Jennings, Susan Summers, Kazuyuki Tsunoda, Masayuki Amagai, and Andrew P. Kowalczyk³

From the Departments of Dermatology and Cell Biology, Emory University School of Medicine, Atlanta, Georgia 30322 and Department of Dermatology, Keio University School of Medicine, Shinjuku-ku 160-8582, Japan

Desmosomes are adhesive intercellular junctions prominent in the skin and heart. Loss of desmosome function is associated with severe congenital and acquired disorders characterized by tissue fragility. Pemphigus vulgaris (PV) is an autoimmune disorder in which antibodies are directed against the desmosomal adhesion molecule Dsg3, resulting in severe mucosal erosions and epidermal blistering. To define the mechanisms by which Dsg3 autoantibodies disrupt keratinocyte adhesion, the fate of PV IgG and various desmosomal components was monitored in primary human keratinocytes exposed to PV patient IgG. PV IgG initially bound to keratinocyte cell surfaces and colocalized with desmosomal markers. Within 6 h after PV IgG binding to Dsg3, electron microscopy revealed that desmosomes were dramatically disrupted and keratinocyte adhesion was severely compromised. Immunofluorescence analysis indicated that PV IgG and Dsg3 were rapidly internalized from the cell surface in a complex with plakoglobin but not desmoplakin. Dsg3 internalization was associated with retraction of keratin filaments from cell-cell borders. Furthermore, the internalized PV IgG-Dsg3 complex colocalized with markers for both endosomes and lysosomes, suggesting that Dsg3 was targeted for degradation. Consistent with this possibility, biotinylation experiments demonstrated that soluble Dsg3 cell surface pools were rapidly depleted followed by loss of detergent-insoluble Dsg3. These findings demonstrate that Dsg3 endocytosis, keratin filament retraction, and the loss of keratinocyte cell-cell adhesion are coordinated responses to PV IgG.

Received for publication, November 21, 2005 , and in revised form, December 22, 2005.

^* This work was supported in part by National Institutes of Health Grants R01AR048266 and R21AR050779. The costs of publication of this article were defrayed in part by the payment of page charges. This article must therefore be hereby marked "advertisement" in accordance with 18 U.S.C. Section 1734 solely to indicate this fact.

¹ These authors contributed equally to this work.

² Supported by National Institutes of Health Grant T32AR007587.

³ To whom correspondence should be addressed: Dept. of Cell Biology, Emory University, Whitehead Biomedical Research Bldg., 615 Michael St., Atlanta, GA 30322. E-mail: akowalc{at}emory.edu.

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