Association between Immunofluorescence Pattern and Mucosal Involvement in Patients with Bullous Pemphigoid

Bullous pemphigoid is an acquired autoimmune subepidermal blistering disease which is associated with mucocutaneous lesions. The type and amount of autoantibody deposition may have a role in mucosal lesions. We studied the association between mucosal involvement and direct immunofluorescence pattern in cutaneous lesions of patients with bullous pemphigoid. In this retrospective analytical cross-sectional study, we studied the demographic data, clinical presentations, and immunopathological findings of 69 patients with bullous pemphigoid admitted to our hospital 2008-2016. Patients were allocated into two groups on the basis of the mucosal involvement, and direct immunofluorescence patterns were evaluated. The data were analyzed using SPSS version18. The mean age of patients was 70.9±14.97 (mean ± Standard Deviation) years old. In our study, 56.5% of patients were women. All patients showed deposition of IgG and C3 in the dermoepidermal junction, with different severity. Patients with mucosal involvement (40.6% of cases) had a more prominent deposition of IgG, IgA, and C3 at the dermoepidermal junction compared with patients without mucosal involvement, which represented a statistically significant difference (P<0.05). Logistic regression analysis showed that lower age, IgA, and C3 deposition (P<0.05) were associated with mucosal involvement. Deposition of IgA and C3 (in addition to IgG) at the dermoepidermal junction seems to be a marker of mucosal involvement in patients with bullous pemphigoid. Attention to direct immunofluorescence pattern in patients with bullous pemphigoid may be helpful in prediction of mucosal involvement in these patients.