A case of mucous membrane pemphigoid with anti-BP230 autoantibodies alone

Pemphigus vulgaris and mucous membrane pemphigoid: A systematic review of clinical manifestations, diagnosis, and treatment

Pemphigus vulgaris (PV) and mucous membrane pemphigoid (MMP) are mucocutaneous autoimmune diseases characterized by blistering lesions of mucous membranes and skin, with very similar clinical manifestations. This study aimed to systematically review the literature on the clinical and demographic profile, diagnostic methods, and treatment of patients with pemphigus vulgaris (PV) and mucous membrane pemphigoid (MMP). Studies describing cases of PV and MMP diagnosed by direct immunofluorescence that exhibited intraoral manifestations were included. Thirty-two articles were included, with 18 studies on PV and 15 on MMP, corresponding to 50 and 123 cases diagnosed as PV and MMP, respectively. Most patients with PV (64 %) and MMP (81.3 %) were women in the fifth and sixth decade of life, respectively. The mouth was the primary site of involvement both in PV (71.4 %) and in MMP (91 %). The cheek mucosa and gingiva were the most frequently affected intraoral sites in PV (30 %) and MMP (64.2 %), respectively. Direct immunofluorescence was positive for IgG in all cases of the two conditions. The treatment of choice was systemic corticosteroid therapy for patients with PV (50 %) and topical treatment for patients with MMP (53.7 %). Differences in intraoral site predilection, extraoral involvement, and the results of diagnostic tests allow us to trace the clinical, demographic, and diagnostic profile of PV and MMP that contributes to differential diagnosis and therapeutic management.

What's new in the pathogeneses and triggering factors of bullous pemphigoid

Bullous pemphigoid (BP) is a subepidermal blistering disease induced by autoantibodies to type XVII collagen (COL17, also called BP180) and BP230. Previous studies using patients' samples and animal disease models elucidated the complement-dependent and complement-independent pathways of blister formation, the pathogenic roles of immune cells (T and B cells, macrophages, mast cells, neutrophils, eosinophils), and the pathogenicity of IgE autoantibodies in BP. This review introduces the recent progress on the mechanism behind the epitope-spreading phenomenon in BP, which is considered to be important to understand the chronic and intractable disease course of BP, and the pathogenicity of anti-BP230 autoantibodies, mainly focusing on studies that used active disease models. To clarify the pathogenesis of BP, the mechanism behind the breakdown of immune tolerance to BP antigens should be investigated. Recent studies using various experimental models have revealed important roles for regulatory T cells in the maintenance of self-tolerance to COL17 and BP230 as well as in the suppression of inflammation triggered by the binding of antibodies to COL17. Notably, physical stresses such as trauma, thermal burns, bone fractures, irradiation and ultraviolet exposure, some pathologic conditions such as neurological diseases and hematological malignancies, and the use of dipeptidyl peptidase-IV inhibitors and immune checkpoint inhibitors have been reported as triggering factors for BP. These factors and certain underlying conditions such as genetic background, regulatory T-cell dysfunction or aging might synergistically affect some individuals and eventually induce BP. Further studies on the breakdown of self-tolerance and on the identification of key molecules that are relevant to blister formation and inflammation may expand our understanding of BP's etiology and may lead to the development of novel therapeutic approaches.

Case report: Minimal manifestations of mucous membrane pemphigoid in a young adult

A male patient presented to our department at the age of 23 suffering from recurrent painful erosions in the urethral outlet area. In closer clinical examination gingival erosions, primarily around the teeth were identified as well. Indirect immunofluorescence on salt split skin with epidermal IgG deposition and positive anti-BP230 IgG ELISA diagnostics hinted toward the presence of mucous membrane pemphigoid (MMP). Direct immunofluorescence from oral mucosa confirmed the diagnosis. MMP in young adulthood is an underdiagnosed disease and latency of diagnosis was around 4 years in our case. Treatment with systemic glucocorticosteroids and dapsone led to clinical remission, prohibiting the development of MMP manifestations in further organs and complications associated with the disease, e.g., scar formation and miction problems.