Autoantibody in Mucous Membrane Pemphigoid Binds to an Intracellular Epitope on Human β4 Integrin and Causes Basement Membrane Zone Separation in Oral.

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Autoantibody in Mucous Membrane Pemphigoid Binds to an Intracellular Epitope on Human β4 Integrin and Causes Basement Membrane Zone Separation in Oral Mucosa in an Organ Culture Model K.C. Bhol, J.E. Colon, A.R. Ahmed Journal of Investigative Dermatology Volume 120, Issue 4, Pages 701-702 (April 2003) DOI: 10.1046/j.1523-1747.2003.12081.x Copyright © 2003 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 1 Binding specificity of sera to IC 3.0 and IC 3.4. Immunoblot analysis of fusion proteins produced by clones representing IC 3.0 and IC 3.4 fragments, presented in panel A and panel B, respectively. The fusion proteins in lane 1 in both the panels are immunoblotted with MMP sera. Note an ≈37kDa band indicating binding to IC 3.0, and an ≈10kDa band indicating binding to IC 3.4 by MMP sera. The fusion proteins in lane 2 in panels A and B are immunoblotted with rabbit antibody to IC 3.0 and IC 3.4 fragments, respectively. The presence of an ≈37kDa band indicates binding to IC 3.0 and an ≈10kDa band indicates binding to IC 3.4. The fusion proteins in lane 3 in both the panels were immunoblotted with antibody to the cytoplasmic domain of β4 integrin. Note binding to IC 3.0 as demonstrated by the presence of an ≈37kDa band, and absence of binding to IC 3.4. The fusion proteins in lanes 4 and 5 in both the panels were immunoblotted with normal human serum and preimmune rabbit serum, respectively. Note absence of binding either to IC 3.0 (≈37kDa) or IC 3.4 (≈10kDa). Journal of Investigative Dermatology 2003 120, 701-702DOI: (10.1046/j.1523-1747.2003.12081.x) Copyright © 2003 The Society for Investigative Dermatology, Inc Terms and Conditions

Figure 2 Organ culture model to demonstrate BMZ separation of buccal mucosa. In vitro organ culture model of normal human buccal mucosa incubated with (a) MMP serum, (b), (c) rabbit antibody to IC 3.0 and IC 3.4 fragments, respectively, (d) PV serum, (e), (f) normal human serum and preimmune rabbit serum, respectively. In the normal human buccal mucosa section cultured with MMP serum and rabbit antibodies to IC 3.0 and IC 3.4 histologic identical BMZ separation was observed. Pemphigus vulgaris serum produced acantholysis of epithelial cells in the buccal mucosa, serving as a positive control for the assay. Normal human serum and preimmune rabbit serum did not produce BMZ separation. Journal of Investigative Dermatology 2003 120, 701-702DOI: (10.1046/j.1523-1747.2003.12081.x) Copyright © 2003 The Society for Investigative Dermatology, Inc Terms and Conditions