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Macrophages, But Not T and B Lymphocytes, Are Critical for Subepidermal Blister Formation in Experimental Bullous Pemphigoid: Macrophage-Mediated Neutrophil Infiltration Depends on Mast Cell Activation¹

Ruoyan Chen^*, Janet A. Fairley, Ming-Lang Zhao^*, George J. Giudice, Detlef Zillikens, Luis A. Diaz^* and Zhi Liu^2,*

^* Department of Dermatology, University of North Carolina, Chapel Hill, NC 27599; Department of Dermatology, Medical College of Wisconsin, Milwaukee, WI 53226; Department of Dermatology, University of Würzburg, Würzburg, Germany

Bullous pemphigoid (BP) is a subepidermal blistering disease associated with autoantibodies against two hemidesmosomal proteins, BP180 and BP230. Numerous inflammatory cells infiltrate the upper dermis in BP. We have previously shown by passive transfer studies that Abs to the ectodomain of murine BP180 are capable of triggering blisters in mice that closely mimic human BP. Experimental BP depends on complement activation and neutrophil infiltration. In the present study, we investigated the relative contribution of neutrophils, mast cells (MCs), macrophages (M), and lymphocytes and their functional relationship in the immunopathogenesis of this disease model by using mice deficient in these cells. Wild-type, T cell-deficient, and T and B cell-deficient mice injected intradermally with pathogenic anti-murine BP180 IgG exhibited extensive subepidermal blisters. In contrast, mice deficient in neutrophils, MCs, and M were resistant to experimental BP. MCs play a major role in neutrophil recruitment into the dermis. Furthermore, M-mediated neutrophil infiltration depends on MC activation/degranulation.

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